JP3367323B2 - High-temperature regenerator and absorption chiller / heater for absorption chiller / heater - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature regenerator for an absorption chiller-heater and an absorption chiller-heater.

[0002]

2. Description of the Related Art As a high temperature regenerator for an absorption chiller-heater, there is one disclosed in, for example, JP-A-6-221718. Specifically, the high temperature regenerator forms a liquid chamber that holds a solution between an outer cylinder and an inner cylinder, the inside of the inner cylinder is a combustion chamber that heats the solution, and the inner cylinder is provided downstream of the combustion chamber. A solution pipe having a flat cross section in the flow direction is arranged so as to communicate with the upper and lower liquid chambers and intersect with the combustion gas. The solution tube is provided with fins to make the heat flux uniform on the heat transfer surface of the solution tube.

[0003]

The aqueous solution of lithium bromide (LiBr aqueous solution) heated and boiled in a high temperature regenerator has strong corrosiveness at high temperature. In the conventional example as described above,
The flow of the combustion gas from the combustion chamber through the heat transfer tube is uniform, and the heat flux distribution is uniform over the entire heat transfer surface.Therefore, due to the boiling of the aqueous solution of lithium bromide, the heat transfer coefficient after boiling is higher than that before boiling. When becomes larger, there is a problem that the temperature of the heat transfer surface that comes in contact with the solution before boiling rises and corrosion progresses.

For example, consider an experimental apparatus in which there is a tube having a circular cross section which is long in the direction of gravity, the interior is filled with a LiBr aqueous solution, and the LiBr aqueous solution can freely enter and exit from the upper end and the lower end of the tube. FIG. 20 shows the experimental results when a uniform heat flux was applied to the tube and the 63% LiBr aqueous solution inside the tube was boiled under the internal pressure of 53.7 kPa. The horizontal axis of FIG. 20 is the temperature difference (K) between the inner wall temperature of the tube and the liquid temperature at the outlet of the tube, and the vertical axis is the length of the tube from the lower end to the upper end measured. Figure 2
From 0, it can be seen that the temperature of the inner wall of the tube is not affected by the magnitude of the heat flux, and the lower part of the tube always tends to be higher than the upper part. That is, the heat transfer coefficient at the liquid-side heat transfer surface before and after the boiling of the LiBr aqueous solution is higher when the liquid depth is shallower than when the liquid depth is deep.

The present invention is directed to a high temperature regenerator and an absorption chiller / heater of an absorption chiller / heater in which corrosion deterioration of the liquid-side heat transfer surface of the high temperature regenerator is mitigated to achieve long life, high reliability and energy saving. The purpose is to provide.

[0006]

The above-mentioned object is to form a liquid chamber for holding a solution between an outer cylinder and an inner cylinder, the inside of the inner cylinder being a combustion chamber for heating the solution, In a high-temperature regenerator of an absorption chiller-heater having a solution pipe communicating downstream with the upper and lower liquid chambers of the inner cylinder and intersecting with combustion gas, a solution pipe having a deep liquid depth on the combustion gas side of the solution pipe This is achieved by installing fins that are denser in pitch than in the solution tube where the depth is shallower.

Further, the above object can be achieved by providing a fin on the combustion gas side of the solution pipe, the fin having a deeper depth in the solution pipe portion than the solution pipe portion having a shallow liquid depth.

Further, the above object can be achieved by providing a fin on the combustion gas side of the solution pipe, the fin having a larger depth in the solution pipe portion having a deeper liquid depth than in the solution pipe portion having a shallow liquid depth.

By making the fin pitch denser in the solution pipe portion having the deeper liquid depth than in the solution pipe portion having the shallower liquid depth, the heat load on the heat transfer surface on the liquid contact side is lower at the lower portion of the heat transfer tube and at the upper portion. Then, the temperature distribution becomes higher, and the temperature distribution in the liquid contact side heat transfer surface can be made uniform.

[0010]

1 is a cutaway perspective view of a high temperature regenerator according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the high temperature regenerator of FIG. 1, and FIG. 3 is a horizontal view of FIG. FIG.

In the figure, the high temperature regenerator 1 comprises an outer cylinder 101, an inner cylinder 102, a plurality of solution tubes 103, a burner 104, a solution inflow tube 105, and a gas-liquid separation plate 106. The inner cylinder 102 is inside the outer cylinder 101, and the solution 1 is placed between them.
09 is held, and the inner cylinder 102 is submerged in this solution 109. The burner 104 penetrates the inner cylinder 102 and penetrates the outer cylinder 10.
It is attached to the side surface of No. 1 and the inside of the inner cylinder 102 is a combustion chamber 111. The outer cylinder 101 and the inner cylinder 102
Form a liquid chamber 112, and a plurality of solution pipes 103 that communicate with the upper and lower sides of the liquid chamber 112 of the inner cylinder 102 are installed downstream of the combustion chamber 111 (on the right side of the drawing), and the inside is filled with the solution 109. There is. The solution tube 103 has an oval (or flat) horizontal cross section, and a plurality of the solution tubes 103 are arranged in a line so that the linear parts of the oval are parallel to each other. A combustion gas passage is formed between the adjacent solution pipes 103, and fins 121 are arranged on the combustion gas side surface of the solution pipe 103 such that the fins 121 are closer to the lower part of the solution pipe 103 (the mounting structure is welded or Screw tightening etc.). In order to make the wall temperature of the solution tube 103 uniform in both the shallow and deep places, it is preferable that the lower portion is denser than the upper portion in the range of 1.2 to 4 times. The reason is that if the ratio is 1.2 times or less, the wall temperature becomes lower in the portion where the liquid depth is deeper, which is not preferable. Further, if it is 4 times or more, the wall temperature becomes higher in the portion where the liquid depth is shallow, which is not preferable. Further, inside the outer cylinder 101, a solution inflow pipe 105 and a gas-liquid separation plate 106 are installed above the solution 109, a solution outflow hole 107 is provided on a side surface of the outer cylinder 101, and a refrigerant vapor outflow hole 108 is provided on an upper surface. Has been. The float box 110 communicates with the outer cylinder 101 through the solution outflow hole 107, and the solution inflow pipe 105 is connected to the float box 110.
It is connected to the inside of the outer cylinder 101 through the inside. A float valve is provided in the middle of the solution inflow pipe 105 in the float box 110, and the flow rate of the solution fed into the high temperature regenerator 1 is adjusted according to the height of the liquid surface in the float box.

The combustion gas from the burner 104 is supplied to the inner cylinder 10
After heating the solution 109 mainly by radiant heat transfer through the wall surface of 2, the solution 10 in the solution tube 103 is transferred by convective heat transfer while passing through the flow path sandwiched by the flat plate surfaces of the adjacent solution tubes 103.
9 is heated, flows into the flue box 113, and is discharged to the outside through a chimney 114 connected to the upper part of the flue box 113 (almost the same height as or higher than the solution tube 103). The heated solution 109 boils to generate a refrigerant vapor, and the generated refrigerant vapor becomes an upward flow and the solution pipe 1
03, ascending the flow path between the inner cylinder 102 and the outer cylinder 101,
It goes out on the liquid surface, bypasses the gas-liquid separation plate 106, and exits from the refrigerant vapor outflow hole 108. On the other hand, the solution is the solution inflow pipe 10
The solution, which is introduced into the high temperature regenerator 1 through 5 and is heated and boiled in the high temperature regenerator 1 to have a high concentration, flows into the solution outflow port 10
7 to the float box 110. The solution is temporarily stored in the float box 110 to form a liquid surface, and then exits.

As described above, according to this embodiment, since the chimney is arranged downstream of the solution pipe,
Combustion gas drifts upward, and the heat load on the liquid side heat transfer surface is low at the bottom of the heat transfer tube and high at the top, so the temperature distribution on the liquid contact side in the heat transfer surface can be made uniform and corrosion deterioration can be prevented. Can be relaxed.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a vertical sectional view of the high temperature regenerator, and FIG. 5 is a horizontal sectional view of the high temperature regenerator. The high temperature regenerator 2 includes an outer cylinder 101, an inner cylinder 102, a plurality of solution pipes 303, a burner 104, a solution inflow pipe 105, and a gas-liquid separation plate 106. The inner cylinder 102 is inside the outer cylinder 101, a solution 109 is held between the two, and the inner cylinder 102 is submerged in the solution 109. The burner 104 penetrates the inner cylinder 102 and is attached to the side surface of the outer cylinder 101, and the inside of the inner cylinder 102 serves as a combustion chamber 111. The outer cylinder 1
01 and the inner cylinder 102 form a liquid chamber 112, and the combustion chamber 11
A plurality of solution pipes 303 that communicate the upper and lower liquid chambers 112 of the inner cylinder 102 are installed downstream of the inner cylinder 102, and the inside thereof is filled with the solution 109. The solution pipe 303 has a circular horizontal cross section, and a combustion gas passage is provided between the adjacent solution pipes 303. The fins 321 are formed on the surface of the solution pipe 303 on the combustion gas side so that the fins 321 are denser in the lower part of the solution pipe 303. It is located in. Other configurations are the same as those of the embodiment shown in FIGS. 1, 2 and 3.

Another embodiment of the present invention will be described with reference to FIGS. 6, 7 and 8. 6 is a cutaway perspective view of the high temperature regenerator of the embodiment, FIG. 7 is a vertical sectional view of the high temperature regenerator of FIG. 6, and FIG. 8 is a horizontal sectional view of FIG. High temperature regenerator 3
Is composed of an outer cylinder 101, an inner cylinder 102, a plurality of smoke pipes 403, a burner 104, a solution inflow pipe 105, and a gas-liquid separation plate 106. The inner cylinder 102 and the smoke tube 403 are inside the outer cylinder 101, and the solution 109 is held between the inner cylinder 102 and the smoke tube 403 and the outer cylinder 101.
3 is submerged in this solution 109. The burner 104 penetrates the inner cylinder 102 and is attached to the side surface of the outer cylinder 101, and the inside of the inner cylinder 102 serves as a combustion chamber 111. The liquid chamber 11 includes the outer cylinder 101, the inner cylinder 102, and the smoke pipe 403.
2 from the outer wall surface downstream of the combustion chamber 111 to the outer cylinder 10
A plurality of smoke pipes 403 are installed through the rear tube sheet of one. The smoke tubes 403 have a rectangular vertical cross section, and a plurality of the smoke tubes 403 are arranged in a line so that the long straight portions of the rectangle are parallel to each other. A solution passage is provided between adjacent smoke tubes 403. Fins 421 are formed on the surface of the smoke pipe 403 on the combustion gas side.
Are arranged so that the lower part of the smoke pipe 403 becomes denser.
A solution inflow pipe 105 and a gas-liquid separation plate 106 are installed above the solution 109 inside the outer cylinder 101.
A solution outflow hole 107 is provided on the side surface of and the refrigerant vapor outflow hole 108 is provided on the upper surface. The float box 110 is in communication with the outer cylinder 101 through the solution outflow hole 107, and the solution inflow pipe 105 is connected to the inside of the outer cylinder 101 through the inside of the float box 110. A float valve is provided in the middle of the solution inflow pipe 105 in the float box 110, and the flow rate of the solution fed into the high temperature regenerator 3 is adjusted according to the liquid level height in the float box.

The combustion gas from the burner 104 is supplied to the inner cylinder 10
After heating the solution 109 mainly by radiant heat transfer through the wall surface of 2, the solution 109 in the vicinity of the smoke tube 403 is heated by convective heat transfer while passing through the plurality of smoke tubes 403, and flows into the flue box 113 to emit smoke. It is discharged to the outside through a chimney 114 connected to the upper part of the road box 113. The heated solution 109 boils to generate refrigerant vapor, and the generated refrigerant vapor becomes an upward flow and rises in the flow path between the adjacent smoke tubes 403 and the flow path between the outer cylinder 101 and the inner cylinder 102. , Goes out of the vapor-liquid separation plate 106 and goes out from the refrigerant vapor outflow hole 108 on the liquid surface. On the other hand, the solution is introduced into the high temperature regenerator 3 through the solution inflow pipe 105, and the solution that has been heated and boiled in the high temperature regenerator 3 to have a high concentration is sent from the solution outflow hole 107 to the float box 110. The solution is temporarily stored in the float box 110 to form a liquid surface, and then exits.

As described above, according to the present embodiment, since the chimney is arranged in the upward direction on the downstream side of the smoke pipe, the combustion gas is deflected upward and the heat load on the liquid-side heat transfer surface is increased. Since the temperature is low in the lower part and high in the upper part, the temperature distribution in the heat transfer surface can be made uniform and the corrosion deterioration can be mitigated.

Further, in FIGS. 6, 7, and 8, the fins 4 are provided on the combustion gas side in order to make the temperature distribution on the liquid contact side in the heat transfer surface uniform.
Although 21 is attached, even if a fin 422 is installed on the lower liquid surface of the heat transfer tube as shown in FIG. 9 to increase the heat transfer area, the temperature distribution on the liquid contact side in the heat transfer surface can be made uniform, and The effect is obtained.

Although the chimney 114 is connected to the upper surface of the flue box 113 in the above embodiment, the same effect can be obtained by connecting it to the upper side of the side surface of the flue box 113 as shown in FIGS. 10 and 11. The effect is obtained.

Furthermore, another embodiment of the present invention is shown in FIGS.
3 and FIG. 14 will be described. FIG. 12 is a cutaway perspective view of a high temperature regenerator according to an embodiment of the present invention, which is divided into a gas-liquid separator A and a high temperature regenerator body B. 13 is a vertical sectional view of the main body B of the high temperature regenerator 4 of FIG. 12, and FIG.
FIG. The main body B of the high temperature regenerator 4 is an outer cylinder
1 and an inner cylinder 102, a plurality of smoke tubes 403, and a burner 104. The inner cylinder 102 and the smoke tube 403 are inside the outer cylinder 101, the solution 109 is held between the inner cylinder 102 and the smoke tube 403, and the outer cylinder 101, and the inner cylinder 102 and the smoke tube 403 are submerged in the solution 109. ing. The burner 104 penetrates the inner cylinder 102 and is attached to the side surface of the outer cylinder 101, and the inside of the inner cylinder 102 serves as a combustion chamber 111. A liquid chamber 112 is formed by the outer cylinder 101, the inner cylinder 102, and the smoke tube 103, and a plurality of smoke tubes 403 are installed so as to penetrate from a downstream wall surface of the combustion chamber 111 to a rear tube plate of the outer cylinder 101. The smoke tubes 403 have a rectangular vertical cross section, and a plurality of the smoke tubes 403 are arranged in a line so that the long straight portions of the rectangle are parallel to each other. Fins 421 are arranged on the surface of the smoke pipe 403 on the combustion gas side so that the lower part of the smoke pipe 403 is denser. A solution passage is provided between the smoke pipe 403 and the smoke pipe 403, and a solution inflow pipe 105 is installed in the lower portion of the side surface of the outer cylinder 101 so that the dilute solution flows in from the lower portion of the solution passage. Further, the gas-liquid separator A is connected to the upper outside of the outer cylinder 101 of the high temperature regenerator body B, and the gas-liquid separation plate 151,
It comprises a solution outflow pipe 152 and a refrigerant vapor outflow pipe 153.

As described above, according to the present embodiment, since the chimney is arranged upward in the downstream of the smoke pipe, the combustion gas is distributed upward, the combustion gas amount in the upper portion is large, and the combustion gas in the lower portion is large. Since the amount of gas is small, the heat load on the liquid-side heat transfer surface is low in the lower part of the heat transfer tube and high in the upper part, so that the temperature distribution on the liquid contact side within the heat transfer surface can be made uniform and corrosion deterioration can be mitigated. .

In the above embodiments, the fin arrangement inside the smoke tube is dense in the lower part of the heat transfer tube. However, the fins may be thicker in the lower part of the heat transfer tube, or the fin height may be higher in the lower part of the heat transfer tube. Even if it does, the same effect can be obtained. Also in this case, in order to make the wall temperature of the solution tube 103 uniform at both the shallow and deep places, it is preferable that
The thickness of the fin is made thicker or thicker in the lower part in the range of 1.2 to 4 times that of the upper part. The reason is 1.2
If it is less than twice, the wall temperature becomes lower at the portion where the liquid depth is deeper, which is not preferable. Further, if it is 4 times or more, the wall temperature becomes higher in the portion where the liquid depth is shallow, which is not preferable.

Further, another embodiment of the present invention is shown in FIGS.
Will be explained. FIG. 15 is a vertical sectional view of the high temperature regenerator, and FIG. 16 is a horizontal sectional view of the high temperature regenerator. The high temperature regenerator 5 includes an outer cylinder 101, an inner cylinder 102, a plurality of smoke tubes 503,
It comprises a burner 104, a solution inflow pipe 105, and a gas-liquid separation plate 106. The inner cylinder 102 and the smoke pipe 503 are the outer cylinder 101.
Inside the inner tube 102, the inner tube 102, the smoke pipe 503, and the outer tube 101.
A solution 109 is held between and, and the inner cylinder 102 and the smoke pipe 503 are submerged in the solution 109. Burner 104
Is attached to the side surface of the outer cylinder 101 penetrating the inner cylinder 102, and the inside of the inner cylinder 102 serves as a combustion chamber 111. A liquid chamber 112 is formed by the outer cylinder 101, the inner cylinder 102, and the smoke pipe 503, and a plurality of smoke pipes 503 are installed so as to penetrate from a downstream wall surface of the combustion chamber 111 to a rear tube plate of the outer cylinder 101. The smoke tube 503 has a circular vertical cross section.
A solution passage is provided between the smoke pipe 503 and the smoke pipe 503.
A baffle plate 115 is installed inside the flue box 113 below the downstream outlet of the tube group formed by the smoke tube 503.
Other configurations are the same as those in the embodiments of FIGS. 6, 7, and 8.

As described above, according to this embodiment, the baffle plate is provided on the downstream side of the lower side of the tube group to limit the inflow amount of the combustion gas to the lower side of the tube group. The load can be reduced and local heating can be avoided.

The same effect can be obtained by making the upper tube group denser than the lower tube group with the same tube diameter or making the upper tube group larger in tube diameter. .

Further, in FIGS. 15 and 16, a baffle plate is attached to the combustion gas side in order to make the temperature distribution on the liquid contact side in the heat transfer surface uniform, but as shown in FIG. Even if the fins 522 are installed on the surface to increase the heat transfer area, the temperature distribution in the heat transfer surface can be made uniform, and the same effect can be obtained.

Still another embodiment of the present invention is shown in FIGS.
Will be explained. FIG. 18 is a vertical sectional view of the high temperature regenerator of the embodiment, and FIG. 19 is a horizontal sectional view. The high temperature regenerator 6 is divided into a gas-liquid separator A and a high temperature regenerator body B,
The main body B includes an outer cylinder 101, an inner cylinder 102, a plurality of smoke tubes 503,
It consists of a burner 104. Inner cylinder 102 and smoke pipe 50
3 is inside the outer cylinder 101, and the inner cylinder 102 and the smoke pipe 50
A solution 109 is held between the outer cylinder 3 and the outer cylinder 101, and the inner cylinder 102 and the smoke tube 503 are submerged in the solution 109. The burner 104 penetrates the inner cylinder 102 and is attached to the side surface of the outer cylinder 101, and the inside of the inner cylinder 102 serves as a combustion chamber 111. A liquid chamber 112 is formed by the outer cylinder 101, the inner cylinder 102, and the smoke tube 103, and a plurality of smoke tubes 503 penetrating in the direction of gravity is formed from the outer wall surface of the downstream upper surface of the combustion chamber 111 to the upper rear tube plate of the outer cylinder 101. Is installed.
The smoke pipe 503 has a circular vertical cross section, and a heat transfer promoter is installed inside the smoke pipe 503. A solution passage is provided between the smoke pipe 503 and the smoke pipe 503. In addition, the outer cylinder 101 is provided so that the dilute solution flows from the lower portion of the inner cylinder 102.
A solution inflow pipe 105 is installed in the lower part of the.

The gas-liquid separator A is connected to the upper side surface of the outer cylinder 101 of the main body B of the high temperature regenerator 6 and comprises a gas-liquid separation plate 151, a solution outflow pipe 152 and a refrigerant vapor outflow pipe 153.

As described above, according to this embodiment, since the heat transfer enhancer is installed inside the smoke tube, the heat load on the liquid side heat transfer surface is low at the lower part of the heat transfer tube and high at the upper part of the heat transfer tube. The temperature distribution on the side of the in-plane hot liquid contact can be made uniform, and corrosion deterioration can be mitigated.

Further, instead of the smoke pipe 503 having a circular cross-sectional shape, the flat smoke pipe 4 having the cross-sectional shape shown in FIGS. 12, 13 and 14 is used.
The same effect can be obtained even if the fins on the inner upper surface of the smoke pipe 403 are made dense by using 03.

FIG. 21 shows an absorption type air conditioning system using an absorption type chiller-heater according to an embodiment of the present invention. As shown in the figure, the absorption chiller-heater includes a high temperature regenerator 201 and a low temperature regenerator 20.
2, the condenser 203, the evaporator 204, the absorber 205, the low temperature heat exchanger 206, the high temperature heat exchanger 207, the solution circulation pump 208, the refrigerant pump 209, the heating burner 304, and the low temperature regenerator 202. A heat transfer tube 211 for condensing the refrigerant vapor generated in the regenerator 201 and exchanging heat with a solution flowing out of the tube, a throttle 212 provided in the middle of a pipe for guiding the heat transfer tube 211 to the condenser 203, and a condenser 203. A refrigerant tank 213 provided at the bottom, a U-seal from the condenser 203, a refrigerant liquid pipe 214 that guides a liquid refrigerant to the evaporator 204 via a U-seal and a throttle 215, and a vapor phase portion of the condenser 203 and an evaporator via a valve 217. , A refrigerant vapor pipe 216 having a U seal part in the middle, a discharge of the refrigerant pump 209 and a refrigerant spraying device 22.
Refrigerant pipe 21 for connecting 0 with a float valve 219.
8, a refrigerant tank 221 arranged at the bottom of the evaporator 204,
The refrigerant tank 213 of the condenser 203 and the refrigerant receiver 224 provided above the evaporator 204 and the absorber 205,
A refrigerant blow pipe 223 connected through a refrigerant blow valve 222,
The refrigerant pipe 225 connecting the bottom of the U-seal of the refrigerant vapor pipe 216 and the bubble blowing part 226 of the bubble pump, and the pumping pipe 227 of the bubble pump which is arranged at the upper part of the bubble blowing part 226 of the bubble pump and has the upper part opened to the refrigerant receiver 224. , A refrigerant pipe 228 branched from the middle of the refrigerant pipe 218 and connected to the bubble blowing portion 226 of the bubble pump, a solution return pipe 229 connecting the low temperature heat exchanger 206 and the ejector pump 230, and a low temperature heat exchange from the solution circulation pump 208. Provided in the lower part of the absorber 205, and a solution pipe 231 branching from the middle of the pipe for sending the solution to the container 206 and sending the solution to the ejector pump 230, a solution pipe 232 for guiding the solution from the ejector pump 230 to the solution spraying device 233. Solution tray 234, solution tray 234
And a solution pipe 236 connecting the solution tank 235 at the bottom of the absorber,
A cold / hot water pump 253 is provided between the refrigerant distribution pipe 237 for distributing the refrigerant from the refrigerant receiver 224 to the solution tray 234, the evaporation heat transfer pipe 251 installed in the evaporator 204, and the indoor unit 252.
Hot / cold water pipe 254 for circulating cold / hot water by means of the absorber 2
The cooling water pipe 259 is configured to circulate the cooling water by the cooling water pump 258 between the absorption heat transfer tube 255 installed inside the condenser 05, the condensation heat transfer tube 256 installed inside the condenser 203, and the cooling tower 257.

The system during cooling operation operates as follows. The valves 217 and 222 are closed during the cooling operation. The solution in the solution tank 235 at the lower part of the absorber 205 is cooled by the solution circulation pump 208.
After being sent to the low temperature regenerator 202, a part thereof is sent to the high temperature regenerator 201 through the high temperature heat exchanger 207, and the rest is sent to the low temperature regenerator 202 and sprayed from the spraying device 210. High temperature regenerator 201
The solution sent to is heated by the burner 304 and boils to generate a refrigerant vapor. The generated refrigerant vapor is the low temperature regenerator 202.
After being sent to the heat transfer tube 211 and condensed in the tube, the throttle 212
Through to the condenser 203. The heat of condensation at this time is
The solution sprayed from the spraying device 210 and flowing down the outside of the heat transfer tube 211 is heated to generate refrigerant vapor again. The generated refrigerant vapor is sent to the condenser 203, and the condensation heat transfer tube 2
It is cooled by the cooling water flowing in 56, condensed, and merges with the refrigerant from the high temperature regenerator 201 to be stored in the refrigerant tank 213. On the other hand, the concentrated solution that has generated the refrigerant vapor in the high temperature regenerator 201 and has been concentrated overflows from the high temperature regenerator 201 and is sent to the high temperature heat exchanger 207 via the float box 310. The high temperature heat exchanger 207 exchanges heat with the dilute solution from the absorber to lower the temperature, and then merges with the concentrated solution from the low temperature regenerator 202. The combined concentrated solution is used in the low temperature heat exchanger 20.
At 6 the heat is exchanged with the dilute solution from the absorber 205 to further lower the temperature, and the eject pump 230 is used to remove the solution return pipe 22.
9 and the solution pipe 232, and is sent to the solution spraying device 233 and sprayed in the absorber 205. The dispersed concentrated solution is cooled by the cooling water flowing in the absorption heat transfer tube 255, absorbs the refrigerant vapor from the evaporator 204 and becomes thin in concentration, is collected in the solution tray 234, passes through the solution tube 236, and passes through the solution tank. Return to 235. On the other hand, the liquid refrigerant stored in the refrigerant tank 213 below the condenser 203 overflows from the refrigerant tank 213 and flows into the evaporator 204 via the refrigerant liquid pipe 214 and the throttle 215. In the evaporator 204, the liquid refrigerant in the refrigerant tank 221 provided in the lower portion is transferred to the refrigerant pump 2
09, it is sent to the refrigerant distribution device 220 through the refrigerant pipe 218 and the float valve 219, is sprayed on the evaporation heat transfer pipe 251 in the evaporator 204, is heat-exchanged with the cold water flowing in the pipe group, and is evaporated. The latent heat of vaporization is removed from the cold water, and the freezing action is obtained. The evaporated refrigerant flows out to the absorber 205,
It is absorbed by the concentrated solution flowing down in the absorber 205.

On the other hand, the cooling water cooled in the cooling tower 257 is sent to the absorber 205 by the cooling water pump 258, and the absorption heat is taken up by the absorption heat transfer pipe 255 to raise its temperature, and then sent to the condenser 203 to be condensed. The heat transfer tube 256 takes away the condensation heat to further raise the temperature. Then, it returns to the cooling tower 257 and is cooled. Further, the cold water cooled by the evaporation heat transfer tube 251 in the evaporator 204 is sent to the indoor unit 252 by the cold / hot water pump 253, the room is cooled to increase the temperature, and then returns to the evaporator again.

When the cooling load disappears during the cooling operation, the absorption chiller / hot water generator stop signal is given and the chiller / hot water pump 2 is supplied.
53, cooling water pump 258, cooling tower 257, burner 30
4 immediately stops, and the refrigerant pump 209 also stops at the same time, but the solution pump 208 continues to operate for a certain time to dilute the concentrated solution in the cycle, and the refrigerant blow valve 222 is turned on to prevent the refrigerant from freezing. Open refrigerant tank 213
Of the refrigerant is mixed with the solution on the solution tray 234 through the refrigerant blow pipe 223, the refrigerant receiver 224, and the refrigerant spray pipe 237 to be diluted. By reducing the concentration of the solution, it is possible to reduce the refrigerant vapor absorption capacity of the solution and prevent freezing of the refrigerant and cold / hot water.

On the other hand, during heating operation, the system operates as follows. During the heating operation, the valves 217 and 222 are open, the cooling water pump 258 is stopped, and the absorber 205 is closed.
Cooling water does not flow to the absorption heat transfer tube 255 inside and the condensation heat transfer tube 256 inside the condenser 203. Further, the refrigerant pump 209 is stopped.

Solution tank 23 at the bottom of absorber 205
The solution of No. 5 is sent to the low temperature heat exchanger 206 by the solution circulation pump 208, then a part is sent to the high temperature regenerator 201 through the high temperature heat exchanger 207, and the rest is the low temperature regenerator 202.
And is sprayed from the spraying device 210. The solution sent to the high temperature regenerator 201 is heated and boiled by the burner 304 to generate refrigerant vapor. The generated refrigerant vapor is the low temperature regenerator 2
After being sent to No. 02 and condensed in the tube of the heat transfer tube 211, it is sent to the condenser 203 through the throttle 212. The condensation heat at this time heats the solution that is scattered from the spray device 210 and flows down the outside of the heat transfer tube 211, and again generates the refrigerant vapor. The generated refrigerant vapor is sent to the condenser 203, but since the cooling water does not flow in the tube group provided in the condenser 203, it does not condense and liquefy, and the valve 217 and the refrigerant vapor pipe 216.
To the evaporator 204. In addition, a part of the refrigerant vapor flows from the U seal portion of the refrigerant vapor pipe 216 to the refrigerant pipe 22.
5, it is sent to the refrigerant receiver 224 through the bubble blowing section 226 of the bubble pump and the pumping pipe 227, and is sent from the refrigerant spraying pipe 237 to the solution tray 234 of the absorber 205. Also,
The liquid refrigerant from the high temperature regenerator is sent to the evaporator 204 via the refrigerant blow pipe 223 and the refrigerant blow valve 222. In the evaporator 204, the refrigerant vapor from the condenser is the evaporation heat transfer tube 25.
Heat exchange with the hot water flowing through 1 to condense into liquefaction, and the latent heat of condensation at this time heats the hot water to generate heating capacity. The condensed and liquefied liquid refrigerant is stored in the refrigerant tank 221 and the refrigerant pipe 2
It is sent to the bubble blow-out part 226 of the bubble pump through the refrigerant pipe 228 branched from 18, and moves up the pumping pipe 227 by the action of the bubble pump to flow into the refrigerant receiver 224, and from the refrigerant distribution pipe 237 to the absorber 205. It is sent onto the solution tray 234. On the other hand, the concentrated solution generated by generating the refrigerant vapor in the high temperature regenerator 201 and concentrated is sent from the high temperature regenerator 201 to the high temperature heat exchanger 207 via the float box 310. The high temperature heat exchanger 207 exchanges heat with the dilute solution from the absorber to lower the temperature, and then merges with the concentrated solution from the low temperature regenerator 202. The combined concentrated solution exchanges heat with the dilute solution from the absorber 205 in the low temperature heat exchanger 206 to further lower the temperature, and the ejector pump 230 causes the solution return pipe 229.
And, it is sent to the solution spraying device 233 through the solution pipe 232 and sprayed in the absorber 205. Since cooling water does not flow in the absorption heat transfer tube 255, the concentrated solution that has been sprayed flows down the absorption heat transfer tube 255, mixes with the liquid refrigerant on the solution tray 234, and passes through the solution tube 236 to the solution tank 235. Return.

Further, the evaporation heat transfer tube 251 in the evaporator 204
The hot water heated in the indoor unit 252 is cooled by the cold / hot water pump 253.
Sent to, the room is heated and the temperature drops, and it returns to the evaporator again.

According to the present embodiment, the absorption chiller-heater can be downsized by downsizing the high temperature regenerator.

[0039]

Since the heat load on the liquid contact side heat transfer surface is low in the lower part of the heat transfer tube and high in the upper part, the temperature distribution in the liquid contact side heat transfer surface can be made uniform. As a result, corrosion deterioration on the liquid side is alleviated, the life is extended, energy saving and reliability are improved, and the thickness and weight can be reduced.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view of a high temperature regenerator according to an embodiment of the present invention.

2 is a vertical cross-sectional view of the embodiment of FIG.

FIG. 3 is a horizontal sectional view of the embodiment shown in FIG.

FIG. 4 is a vertical sectional view of a high temperature regenerator according to another embodiment of the present invention.

5 is a horizontal sectional view of the embodiment of FIG.

FIG. 6 is a cutaway perspective view of a high temperature regenerator according to another embodiment of the present invention.

7 is a vertical cross-sectional view of the embodiment of FIG.

FIG. 8 is a horizontal sectional view of the embodiment shown in FIG.

FIG. 9 is a cutaway perspective view of a high temperature regenerator according to another embodiment of the present invention.

FIG. 10 is a vertical sectional view of a high temperature regenerator according to another embodiment of the present invention.

11 is a horizontal sectional view of the embodiment of FIG.

FIG. 12 is a cutaway perspective view of a high temperature regenerator according to another embodiment of the present invention.

13 is a vertical sectional view of the embodiment of FIG.

FIG. 14 is a horizontal sectional view of the embodiment of FIG.

FIG. 15 is a vertical sectional view of a high temperature regenerator according to another embodiment of the present invention.

16 is a horizontal sectional view of the embodiment of FIG.

FIG. 17 is a vertical sectional view of a high temperature regenerator according to another embodiment of the present invention.

FIG. 18 is a vertical sectional view of a high temperature regenerator according to another embodiment of the present invention.

FIG. 19 is a horizontal sectional view of the embodiment of FIG.

FIG. 20 is a temperature difference between a pipe inner wall temperature and a pipe outlet liquid temperature at the top and bottom of the pipe when a uniform heat flux is applied to the pipe and the LiBr aqueous solution in the pipe is boiled.

FIG. 21 is an air conditioning system using an absorption chiller using the high temperature regenerator of the present invention.

[Explanation of symbols]

1, 2, 3, 4, 5, 6, 201 ... High temperature regenerator, 101
... Outer cylinder, 102 ... Inner cylinder, 103 ... Flat solution tube, 104 ...
Burner, 105 ... Solution inflow pipe, 106 ... Gas-liquid separation plate, 1
07 ... Solution outflow hole, 108 ... Refrigerant vapor outflow hole, 109 ...
Solution, 110 ... Float box, 111 ... Combustion chamber, 1
12 ... Liquid chamber, 113 ... Flue box, 114 ... Chimney, 1
21, 321, 421 ... Heat transfer fins, 151 ... Gas-liquid separation plate, 152 ... Solution outflow pipe, 153 ... Refrigerant vapor outflow pipe, 3
03 ... solution pipe, 403 ... flat smoke pipe, 422, 522 ... liquid side heat transfer fins, 503 ... smoke pipe, 523 ... heat transfer accelerator.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yaegashi Kenji Yaegashi 603, Jinrachi-cho, Tsuchiura-shi, Ibaraki Hitachi Ltd. Tsuchiura factory (56) Reference JP 63-311059 (JP, A) JP 63- 302270 (JP, A) JP-A-3-39871 (JP, A) JP-A-6-221718 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 33/00

Claims (11)

(57) [Claims] 1. An inner cylinder having a combustion chamber for heating the solution formed therein, and an outer cylinder formed outside the inner cylinder, wherein the solution is held between the inner cylinder and the outer cylinder. Or a solution pipe that communicates with the upper and lower liquid chambers of the inner cylinder and intersects the combustion gas is formed at least downstream of the combustion chamber, or a cross section is formed on the outer wall surface of the downstream of the combustion chamber. In a high temperature regenerator of an absorption chiller-heater in which a long smoke pipe is arranged vertically and vertically to the flow of combustion gas, a plurality of fins are provided on the combustion gas side of the solution pipe or smoke pipe, and the fins are solution pipes or A high-temperature regenerator for an absorption chiller-heater, characterized in that the lower side of the smoke pipe has a denser pitch than that of the solution pipe or the upper side of the smoke pipe. 2. An inner cylinder having a combustion chamber for heating the solution formed therein, and an outer cylinder formed outside the inner cylinder, wherein the solution is held between the inner cylinder and the outer cylinder. Or a solution pipe that communicates with the upper and lower liquid chambers of the inner cylinder and intersects the combustion gas is formed at least downstream of the combustion chamber, or a cross section is formed on the outer wall surface of the downstream of the combustion chamber. In a high temperature regenerator of an absorption chiller-heater in which a long smoke pipe is arranged vertically and vertically to the flow of combustion gas, a plurality of fins are provided on the combustion gas side of the solution pipe or smoke pipe, and the fins are solution pipes or A high-temperature regenerator for an absorption chiller-heater, characterized in that the lower side of the smoke pipe has a higher fin height than that of the solution pipe or the upper side of the smoke pipe. 3. An inner cylinder having a combustion chamber for heating the solution formed therein, and an outer cylinder formed outside the inner cylinder, wherein the solution is held between the inner cylinder and the outer cylinder. Or a solution pipe that communicates with the upper and lower liquid chambers of the inner cylinder and intersects the combustion gas is formed at least downstream of the combustion chamber, or a cross section is formed on the outer wall surface of the downstream of the combustion chamber. In a high temperature regenerator of an absorption chiller-heater in which a long smoke pipe is arranged vertically and vertically to the flow of combustion gas, a plurality of fins are provided on the combustion gas side of the solution pipe or smoke pipe, and the fins are solution pipes or A high temperature regenerator for an absorption chiller-heater, characterized in that the lower side of the smoke pipe has a larger fin thickness than that of the upper side of the solution pipe or the smoke pipe. 4. The high temperature regenerator for an absorption chiller-heater according to claim 3, wherein the thickness of the fin is 1.2 to 4 times thicker on the lower side than on the upper side. 5. A high temperature regenerator for an absorption chiller-heater according to any one of claims 1 to 4, wherein a chimney is arranged upwardly downstream of the solution pipe or the smoke pipe . 6. An absorption chiller-heater in which a high-temperature regenerator, a low-temperature regenerator, a condenser, and an absorber are connected to form a refrigeration cycle, wherein the high-temperature regenerator transfers heat to a lower part of a liquid chamber into which a solution flows. An absorption chiller-heater characterized by having a low heat flux on the surface and a high heat flux on the upper heat transfer surface. 7. An absorption chiller-heater comprising a refrigerating cycle in which a high temperature regenerator, a low temperature regenerator, a condenser and an absorber are connected to each other, wherein the high temperature regenerator is a gas flow rate of a lower portion of a liquid chamber into which a solution flows. However, the absorption chiller-heater is characterized by having a smaller gas flow rate than the upper part. 8. An absorption chiller-heater in which a refrigeration cycle is constituted by connecting a high temperature regenerator, a low temperature regenerator, a condenser and an absorber, wherein the high temperature regenerator is a combustion gas in a lower part of a liquid chamber into which a solution flows. The absorption chiller-heater is characterized in that the mass flux of is lower than the mass flux of the combustion gas in the upper part. 9. A liquid chamber for holding a solution is formed around an outer cylinder and an inner cylinder, and a space for separating gas and liquid is formed above the liquid chamber, and the inside of the inner cylinder has a heating source. Is a combustion chamber that burns and heats the solution, and an absorption type cold temperature in which a solution pipe is arranged in a direction that intersects with the combustion gas and communicates with the liquid chambers above and below the inner cylinder in the combustion chamber where the combustion gas flows. In a high-temperature regenerator of a water machine, a heating source is arranged on one side surface of the combustion chamber, and a solution pipe arranged in a direction intersecting with the combustion gas from the heating source is formed flat in a direction in which the combustion gas flows, A solution pipe having a deep liquid depth has a pitch 1.2 to 4 times denser than a solution pipe having a shallow liquid depth, and a fin is provided on the combustion gas side of the solution pipe along a direction in which the combustion gas flows. A flue box having the same height as the solution pipe is arranged downstream of the solution pipe through which the combustion gas flows, High temperature regenerator of an absorption chiller-heater and providing a upwardly chimney on top of the box. 10. A liquid chamber for holding a solution is formed around an outer cylinder and an inner cylinder, and a space for separating gas and liquid is formed above the liquid chamber, and the inside of the inner cylinder has a heating source. absorption type cold but the combustion chamber for heating the solution to combustion, wherein the downstream flow of the combustion gas in the combustion chamber to place the smoke pipe in a direction intersecting with the combustion gases communicates with the upper and lower liquid chamber of said inner tube in the high-temperature regenerator of water machine, a heat source on one side of the combustion chamber is arranged, smoke tubes arranged in a direction intersecting with the combustion gases from the heating source is flattened form in the direction of flow of the combustion gases, The solution pipe with a deep liquid depth has a pitch of 1. compared to the solution pipe with a shallow liquid depth.
2-4 times a Dense fin along the direction of flow of combustion gases joined to the combustion gas side of the smoke tube, place the flue box of the same height as the smoke tube downstream of the smoke tube of flow of the combustion gas A high temperature regenerator for an absorption chiller-heater, which is characterized in that a chimney is provided upward on the upper part of the flue box. 11. A liquid chamber for holding a solution is formed around an outer cylinder and an inner cylinder, and a space for separating gas and liquid is formed above the liquid chamber, and the inside of the inner cylinder has a heating source. Is a combustion chamber that burns and heats the solution, and a plurality of smoke pipes are provided downstream of the combustion gas in the combustion chamber where the combustion gas flows and communicate with upper and lower liquid chambers of the inner cylinder in the combustion gas flow direction. In a high temperature regenerator of a water machine, a heating source is arranged on one side surface of the combustion chamber, and a plurality of smokes are arranged in a flow direction of combustion gas from the heating source.
The tube is formed by a circular tube, and this circular tube is above the lower smoke tube group.
The smoke tubes that are closer to each other are arranged closer to each other, and the smoke tubes through which the combustion gas flows
A high temperature regenerator for an absorption chiller-heater characterized in that a flue box having the same height as the smoke pipe group is arranged downstream of the flue group, and a chimney is provided upward on the flue box. [0001]