CN213747366U - Sludge drying air-cooled dehumidification heat pump system - Google Patents
Sludge drying air-cooled dehumidification heat pump system Download PDFInfo
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- CN213747366U CN213747366U CN202022757079.6U CN202022757079U CN213747366U CN 213747366 U CN213747366 U CN 213747366U CN 202022757079 U CN202022757079 U CN 202022757079U CN 213747366 U CN213747366 U CN 213747366U
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Abstract
The utility model discloses a sludge drying air-cooled dehumidification heat pump system, including compressor, condenser, expansion valve and evaporimeter, the refrigerant export of compressor loops through the refrigerant entry of condenser, expansion valve and evaporimeter and compressor and is linked together its characterized in that: the compressor is a screw compressor; the inlet of the expansion valve is also communicated with the refrigerant inlet of the compressor through a branch pipe, and a second valve is arranged on the branch pipe. The utility model discloses a screw compressor replaces conventional scroll compressor, has solved the compressor life-span low, maintain frequent technical defect to make entire system's pipeline arrange to obtain simplifying, simultaneously through setting up the branch pipe, make partial refrigerant directly get into the compressor in to the motor cooling.
Description
Technical Field
The utility model relates to a dehumidification heat pump system, especially a dehumidification heat pump system for sludge drying.
Background
Along with urban construction and industrial development, municipal and industrial sludge generation amount is larger and larger, and harmless and recycling treatment is urgently needed. Sludge drying is an indispensable link in the treatment and disposal process. At present, common sludge drying equipment comprises a low-temperature belt type dryer, a rotary drum dryer, a fluidized bed dryer, a thin layer dryer, a disc type dryer and the like. The belt type sludge drying is a common mode, and the high-temperature hot air and the sludge directly flow through for heat exchange to carry out moisture in the sludge out, so that the sludge is gradually dried. Wherein, the temperature rise and the temperature reduction of the circulating air in the drying machine are realized by a heat pump system.
At present, a heat pump system consisting of a plurality of scroll compressors, a condenser, an expansion valve and an evaporator has the problems of low service life of the compressor, frequent maintenance, difficult and complicated arrangement of system component pipelines and the like. On the other hand, due to the change of the system load, the compressor often has the condition that the internal motor is overheated abnormally during the long-term operation. These defects all seriously affect the continuous and stable operation of the drying machine.
SUMMERY OF THE UTILITY MODEL
The utility model provides an air-cooled dehumidification heat pump system of sludge drying, its purpose: the service life of the compressor is prolonged, the maintenance workload is reduced, the overheating of the motor of the compressor is avoided, and the stable operation of the system is ensured.
The utility model discloses technical scheme as follows:
a sludge drying air-cooled dehumidification heat pump system comprises a compressor, a condenser, an expansion valve and an evaporator, wherein a refrigerant outlet of the compressor is communicated with a refrigerant inlet of the compressor sequentially through the condenser, the expansion valve and the evaporator, and the compressor is a screw compressor;
the inlet of the expansion valve is also communicated with the refrigerant inlet of the compressor through a branch pipe, and a second valve is arranged on the branch pipe.
As a further improvement of the system: the refrigerant outlet of the compressor is communicated with the inlet of the oil separator, and the refrigerant outlet of the oil separator is communicated with the inlet of the condenser.
As a further improvement of the system: the oil separator is characterized by further comprising an oil cooling module, and an oil outlet of the oil separator is communicated with a lubricating oil inlet of the compressor through the oil cooling module.
As a further improvement of the system: the oil cooling module includes an oil cooler connected between an oil outlet of the oil separator and a lubricating oil inlet of the compressor.
As a further improvement of the system: the oil cooling module further comprises a thermostat and a first valve;
an oil outlet of the oil separator is communicated with an inlet of the thermostat; and a first outlet of the thermostat is communicated with a lubricating oil inlet of the compressor through the oil cooler, and a second outlet of the thermostat is communicated with a lubricating oil inlet of the compressor through a first valve.
As a further improvement of the system: the economizer is used for supercooling a refrigerant output by the condenser, and meanwhile, a gas outlet of the economizer is communicated with a gas supplementing port of the compressor.
As a further improvement of the system: the condenser also comprises a liquid storage tank, wherein the liquid storage tank is used for storing the refrigerant output by the condenser.
As a further improvement of the system: the compressor is a variable frequency compressor.
Compared with the prior art, the utility model discloses following beneficial effect has: (1) the system adopts the screw compressor to replace the conventional scroll compressor, solves the technical defects of low service life and frequent maintenance of the compressor, and simultaneously simplifies the pipeline arrangement of the whole system; (2) the inlet of the expansion valve is directly connected to the refrigerant inlet of the compressor through the branch pipe, and when the motor is overheated, the second electromagnetic valve is opened, so that part of the refrigerant can directly enter the compressor to cool the motor; (3) the oil separator is used for separating oil from a refrigerant, the oil is input into the compressor for lubrication after being cooled, the return oil temperature can be further monitored through the thermostat, and when the temperature is low, the lubricating oil can directly enter the compressor without being cooled, so that the operating efficiency of the system is improved, and resources are saved; (4) the system is provided with an economizer, and when the refrigerant of the main pipeline is supercooled, part of the refrigerant is gasified and enters the air supplementing port of the compressor to supplement air and increase enthalpy for the screw compressor, so that the efficiency of the compressor is improved; (5) the screw compressor adopts a frequency conversion adjusting mode, can unload and load according to the load requirement, adjusts the heating capacity of the unit, and adapts to the change of the dried materials in the drier.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical scheme of the utility model is explained in detail below with the attached drawings:
referring to fig. 1, the sludge drying air-cooled dehumidification heat pump system comprises a compressor 1, an oil separator 2, a condenser 3, a liquid storage tank 4, an economizer 5, an expansion valve 6, an evaporator 7 and a thermostat 8.
The compressor 1 is a variable-frequency double-screw compressor 1.
The refrigerant outlet of the compressor 1 is communicated with the inlet of the oil separator 2, and the refrigerant outlet of the oil separator 2 is communicated with the inlet of the condenser 3. The refrigerant outlet of the condenser 3 is connected with a liquid storage tank 4, and the outlet of the liquid storage tank 4 is connected with an economizer 5. The economizer 5 is used for supercooling a refrigerant output by the condenser 3, the supercooled refrigerant is output to the expansion valve 6, and meanwhile, a gas outlet of the economizer 5 is communicated with a gas supplementing port of the compressor 1. An outlet of the expansion valve 6 is connected to an inlet of an evaporator 7, and an outlet of the evaporator 7 is connected to a refrigerant inlet of the compressor 1. The inlet of the expansion valve 6 is also communicated with the refrigerant inlet of the compressor 1 through a branch pipe, and a second valve 11 is arranged on the branch pipe.
On the other hand, the oil outlet of the oil separator 2 is communicated with the inlet of the thermostat 8; a first outlet of the thermostat 8 is communicated with a lubricating oil inlet of the compressor 1 through the oil cooler 9, and a second outlet of the thermostat 8 is communicated with a lubricating oil inlet of the compressor 1 through a first valve 10.
Description of the working principle:
the low-pressure low-temperature gaseous refrigerant is changed into high-temperature high-pressure gas by the work of the compressor 1. After oil-gas separation is carried out by the oil separator 2, the refrigerant enters the condenser 3 to heat dry saturated air, and the refrigerant releases heat in the condenser 3 and is converted into high-temperature and high-pressure liquid. Then the high-temperature high-pressure liquid refrigerant enters the inlet of the economizer 5 through the liquid storage tank 4. After internal heat exchange is completed in the economizer 5, the liquid refrigerant enters an electronic expansion valve 6 for throttling and pressure reduction, and enters an evaporator 7 in a gas-liquid mixed state. The mixed refrigerant exchanges heat with the outside wet air indirectly in the evaporator 7, and after the wet air is cooled, the inside water vapor is condensed, so that the dehumidification effect is achieved. The refrigerant is converted into a low-temperature and low-pressure gas state after passing through the evaporator 7 and enters the refrigerant inlet of the compressor 1. The process is a complete dehumidification cycle process.
Due to the variation of the system load, the compressor 1 may have an abnormal overheating of the internal motor during a long-term operation. Therefore, the system designs a branch pipeline on the front main pipeline of the electronic expansion valve 6, and a second electromagnetic valve and other temperature detection devices are arranged on the branch pipeline. If the motor is overheated, the second electromagnetic valve is opened, part of low-temperature refrigerant directly enters the compressor 1, and the temperature of the motor in the compressor is reduced.
In the actual operation process of the system, especially in the low temperature in winter in the north, the efficiency of the compressor 1 is low. Therefore, the economizer 5 is arranged in the system, and partial refrigerant directly enters the air supplement port of the compressor 1 after self heat exchange is completed in the economizer 5, so that the efficiency of the compressor 1 is improved.
Meanwhile, a thermostat 8 arranged behind the oil separator 2 can monitor the oil return temperature. When the temperature is reduced, the lubricating oil does not need to be cooled and can directly enter the lubricating oil inlet of the compressor 1 through the first electromagnetic valve. Otherwise, when a high temperature condition occurs, the lubricating oil enters the oil cooler 9 to be cooled and then enters the lubricating oil inlet of the compressor 1, and the temperature of the motor in the compressor is ensured to be within a normal temperature range.
Obviously, a person skilled in the art can determine whether to configure the economizer 5, the oil separator 2, the oil cooling module, the liquid storage tank 4 and the like according to actual conditions. For example (without limitation):
example two
The present embodiment is different from the first embodiment in that the oil separator 2, the oil cooler 9, and the thermostat 8 are not included, and the condenser 3 is directly connected to the refrigerant outlet of the compressor 1. This embodiment does not achieve oil return.
EXAMPLE III
The difference between this embodiment and the first embodiment is that the thermostat 8 and the first valve 10 are not included, and the lubricating oil output from the oil separator 2 must pass through the oil cooler 9 before entering the compressor 1.
Example four
The difference between the first embodiment and the second embodiment is that the economizer 5 is not included, and the outlet of the liquid storage tank 4 is directly communicated with the expansion valve 6. This embodiment does not provide for an enthalpy addition to the gas supplied to the compressor 1.
Claims (8)
1. The utility model provides a sludge drying air-cooled dehumidification heat pump system, includes compressor (1), condenser (3), expansion valve (6) and evaporimeter (7), the refrigerant export of compressor (1) loops through condenser (3), expansion valve (6) and evaporimeter (7) and is linked together with the refrigerant entry of compressor (1), its characterized in that: the compressor (1) is a screw compressor;
the inlet of the expansion valve (6) is also communicated with the refrigerant inlet of the compressor (1) through a branch pipe, and a second valve (11) is arranged on the branch pipe.
2. The sludge drying air-cooled dehumidifying heat pump system as claimed in claim 1, wherein: the condenser is characterized by further comprising an oil separator (2), wherein a refrigerant outlet of the compressor (1) is communicated with an inlet of the oil separator (2), and a refrigerant outlet of the oil separator (2) is communicated with an inlet of the condenser (3).
3. The sludge drying air-cooled dehumidifying heat pump system as claimed in claim 2, wherein: the oil separator is characterized by further comprising an oil cooling module, and an oil outlet of the oil separator (2) is communicated with a lubricating oil inlet of the compressor (1) through the oil cooling module.
4. The sludge drying air-cooled dehumidifying heat pump system as claimed in claim 3, wherein: the oil cooling module comprises an oil cooler (9) connected between an oil outlet of the oil separator (2) and a lubricating oil inlet of the compressor (1).
5. The sludge drying air-cooled dehumidification heat pump system as set forth in claim 4, wherein: the oil cooling module further comprises a thermostat (8) and a first valve (10);
an oil outlet of the oil separator (2) is communicated with an inlet of the thermostat (8); and a first outlet of the thermostat (8) is communicated with a lubricating oil inlet of the compressor (1) through the oil cooler (9), and a second outlet of the thermostat (8) is communicated with a lubricating oil inlet of the compressor (1) through a first valve (10).
6. The sludge drying air-cooled dehumidifying heat pump system as claimed in claim 1, wherein: the air conditioner is characterized by further comprising an economizer (5) connected between the condenser (3) and the expansion valve (6), wherein the economizer (5) is used for enabling a refrigerant output by the condenser (3) to be supercooled, and meanwhile, a gas outlet of the economizer (5) is communicated with a gas supplementing port of the compressor (1).
7. The sludge drying air-cooled dehumidifying heat pump system as claimed in claim 1, wherein: the condenser is characterized by further comprising a liquid storage tank (4), wherein the liquid storage tank (4) is used for storing a refrigerant output by the condenser (3).
8. The sludge drying air-cooled dehumidifying heat pump system as claimed in any one of claims 1 to 7, wherein: the compressor (1) is a variable frequency compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757079.6U CN213747366U (en) | 2020-11-25 | 2020-11-25 | Sludge drying air-cooled dehumidification heat pump system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022757079.6U CN213747366U (en) | 2020-11-25 | 2020-11-25 | Sludge drying air-cooled dehumidification heat pump system |
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| CN213747366U true CN213747366U (en) | 2021-07-20 |
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| CN202022757079.6U Active CN213747366U (en) | 2020-11-25 | 2020-11-25 | Sludge drying air-cooled dehumidification heat pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115682698A (en) * | 2022-10-21 | 2023-02-03 | 杰瑞环保科技有限公司 | Dehumidification system |
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2020
- 2020-11-25 CN CN202022757079.6U patent/CN213747366U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115682698A (en) * | 2022-10-21 | 2023-02-03 | 杰瑞环保科技有限公司 | Dehumidification system |
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