JPS61114009A - Coal supplying method and apparatus for coal gasification electric power plant - Google Patents

Abstract

PURPOSE:To prevent a back-fire from a gasification furnace, a coal dust exprosion at a coal supplying system and improve safety by a method wherein pulverized coal is supplied to a gasification furnace by utilizing of inactive gas produced and seperated from the system of a composite electric plant at coal gasification. CONSTITUTION:Cabon deoxide remaining in purification gas 28 is contacted with absorbing liquid at a decarbonate tower 75 and is absorbed only in a amount necessary for the coal supply. The absorbing liquid absorbed the carbon deoxide is sent to a reclaim tower 77 and the absorbed carbon deoxide is seperated by reducing pressure and heating, thereafter, it is reclaimed and used in a circulation. The carbon deoxide is seperated from the reclaim tower 77 in this process. The inactive gas 80, having the carbon deoxide as principal component which is obtained by above mentioned process, is pressurized by a pressurizing compressor 81 to be supplied to a lock hopper 3. According to this method, the back-fire and or the coal dust exprosion are prevented and the safety may be improved.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a coal gasification combined cycle power plant using a pressurized air-injected coal gasification furnace, and is applicable to a coal gasification combined cycle power generation plant using a pressurized air-injected coal gasifier. , pulverized coal supply device For example, gas mainly composed of oxygen separated from a lock hopper from a gas purification device, or combustion gas after oxidation treatment of tail gas from a sulfur recovery device by a catalytic combustor, or generated by a gasifier. A combined coal gasification combined power generation system characterized by providing a method that allows pulverized coal to be operated safely by pressurizing it with steam without burning or exploding during the coal supply process, and economically by improving thermal efficiency. This article relates to a putunto coal supply device and its configuration.

[Background of the invention]

Figure 1 shows the overall equipment configuration of a coal gasification combined cycle power plant using a conventional pressurized air-injected coal gasifier.

The pulverized coal 1 is heated in a gasification furnace 10 using air 44 as a gasifying agent, typically at a rate of 20 to 70 kg/cm2.
It is gasified under pressure. Crude gas at the gasifier outlet 4
is cooled by the gasifier outlet steam generator 15.

The sensible heat of this crude gas 4 is recovered as steam. The crude gas 15 from the gasifier outlet steam generator 15 is cooled by heat exchange with purified gas 28 in the gas/gas heat exchanger 20 . The cooled gas is washed with water to remove dust by a dust removal device 22. The dedusting gas 27 is processed by the desulfurization device 23 to remove sulfur content, mainly hydrogen sulfide and carbonyl sulfide, from the gas.
It is absorbed and removed and becomes purified gas 28. The purified gas 28 is heated by exchanging heat in the gas/gas heat exchanger 20 and then combusted as fuel gas 37 in a gas turbine combustor 38.
The high temperature gas performs work in a gas turbine 90 and generates electrical energy in a gas turbine generator 92.
1) The air 44 as a gasification agent extracts a part of the air 4o pressurized by the gas turbine compressor 91, exchanges heat with the feed water 62 of the exhaust heat recovery boiler 46, and once cooled, the pressure is further increased. The compressor 43 increases the pressure required for the gasifier 10 and supplies the gas.

As a heat recovery system, the gas turbine exhaust gas 45 is
At the same time, the waste heat recovery boiler 46 recovers sensible heat and generates steam, and at the same time, the gasifier outlet crude product gas 11 recovers sensible heat and generates steam in the gasifier outlet steam generator 15. These systems are combined to form a system.

The generated steam is superheated by a superheater 47, performs work in a steam turbine 58, and generates electrical energy in a steam turbine generator 59.

The steam that has passed through the steam turbine 58 is cooled in a condenser 60 to become condensate 93, and is sent as feed water 62 to the exhaust heat recovery boiler 4-6 by a feed water pump 61.

Two types of gasifiers for power generation, entrained bed gasifiers and fluidized bed gasifiers, are attracting attention and are currently under research and development.

A fluidized bed gasifier forms a fluidized bed using pulverized coal having a relatively large particle size and a gasifying agent, and performs gasification, and the gasification temperature is generally as low as about 950 t:' or less. This is because the structure is such that the ash in the coal is extracted from the bottom in solid form due to the difference in specific gravity between the coal and the coal. When oxygen is used as a gasification agent, it is recycled to fine powder and gasification is performed in a state where the oxygen concentration is low. For the above reasons, air is generally used as the gasifying agent in fluidized bed gasifiers.

An entrained bed gasifier gasifies pulverized coal, which has a relatively small particle size, as it passes through the gasifier for a short period of time, typically about 1 second. In order to extract the ash in a more molten state, it is necessary to make the gasification temperature higher than the melting point of the ash, and the gasification temperature is as high as about 1300 t:' or higher. When air is used as the gasifying agent in an entrained bed gasifier, extra heat is consumed to raise the nitrogen valve in the air to the gasification temperature, which reduces the coal calorific value of the generated gas. The cold gas efficiency, which is the ratio to the amount of gas, is lower than when oxygen is used as the gasifying agent, and the generated gas contains a large amount of accumulated nitrogen, resulting in a lower calorific value.

However, when oxygen is used as the gasifying agent, it is necessary to install an oxygen generator, which increases construction costs and auxiliary machinery power.

Air and oxygen each have advantages and disadvantages as gasifying agents for entrained bed gasifiers. In general, oxygen is applied to a wide range of coal types and is put into practical use relatively early. Although the types of coal that can be used with air are limited to some extent, future advances in development may allow for higher thermal efficiency than when using oxygen. Therefore, in coal gasification power generation using an entrained bed gasifier, it is thought that a system using iron and a system using air as a gasifying agent complement each other and are compatible.

1 Coal gas FK furnace 10 and gas turbine 90
In a coal gasification combined cycle power generation plant that combines the following, it is necessary to increase the pressure to the gas turbine combustor 38 to the required pressure of 20 atg to 3 degrees aig.

There are two main methods for increasing the pressure of this fuel. One is to set the pressure in the gasifier at normal pressure and increase the pressure of the generated gas after gasification.The other is to supply coal and gasification agent under pressure and gasify under pressure. go and
This method supplies gas to a gas turbine.

When pressurizing the produced gas with the gasifier at normal pressure,
Since the generated gas contains sulfur compounds and dust, it is necessary to increase the pressure of the purified gas after gas purification, and the gasification furnace, gasification furnace outlet steam generator, and gas purification operate at almost atmospheric pressure. Therefore, the capacity of the equipment is larger than that of a pressurized gasifier.

In addition, in gas purification, especially wet gas purification, gas absorption generally increases in proportion to the operating pressure, so it is necessary to absorb gas with a large amount of absorption liquid, which increases the capacity of gas purification. and increased utility usage. Furthermore,
Purified gas has a larger capacity than the gasification agent air or oxygen, and the power required to increase the pressure is greater than that required to increase the pressure of the gasification agent. It has been found that a system that supplies fuel gas to a gas turbine combustor in terms of pressure is superior both in terms of thermal efficiency and in terms of reducing equipment capacity.

Possible coal supply methods include dry pulverized coal supply and water/slurry supply. Water/slurry supply evaporates the moisture in the slurry in the gasifier 10, consuming combustible components in the generated gas, so both cold gas efficiency and thermal efficiency are lower than dry coal supply.

From the above, as a gasifier for coal gasification combined cycle power generation,
It is clear that the pressurized method and dry coal supply are superior in terms of plant thermal efficiency.

The method for supplying pulverized coal to a pressurized gasifier is generally the following method called a lock hopper method.

Incidentally, pressurized screw feeders are also used in small pilot plants currently in operation, but the gasification pressure is only a few atmospheres, and there are many troubles, so they have not been put into practical use. In addition, in actual plants, it is necessary to perform gasification at high pressures of several tens of atmospheres, and the only way to supply pulverized coal to such a pressurized gasifier is to use the lock hopper method. It is.

The pulverized coal l is sent to a coal storage tank 2.

The pulverized coal is further sent to a lock hopper 3. A switching valve is attached to the outlet of the lock hopper 3, and the outlet switching valve is closed, pressurized nitrogen is sent to the lock hopper 3, and pulverized coal is pressurized within the lock hopper 3. When pressurization is completed, the switching valve of the lock hopper 3 is closed and the outlet switching valve is opened, so that the pressurized pulverized coal is sent to the gasifier 10 through the feeder 4. A plurality of lock hoppers are usually installed in one gasifier, and pulverized coal can be continuously supplied by switching operation.

As for the method of pressurizing the lock hopper, when oxygen is used as a gasifying agent, the pressure of nitrogen by-produced in an oxygen generator is increased, and the coal is supplied to the gasifier 10 by supplying it to the lock hopper 3. .

On the other hand, air oxidation gasifiers do not have oxygen generators, so
The problem is the supply of gas to pressurize the lock hopper.

In the conventional embodiment shown in FIG. 1, a nitrogen separator 9 is installed, and the separated nitrogen 8 is pressurized by a nitrogen pressurizer 7 and supplied to the lock hopper 3. In the conventional technology shown in FIG. 1, by using nitrogen, there is no possibility of coal dust explosion in the lock hopper 3, feed tank 4, and supply system 5, or backfire from the gasifier. Although it is possible to operate safely, the operating power of the nitrogen separator 9 is 10
5-20M with 100O class coal gasification integrated power generation grid
It reaches W and is not economical.

In the prior art shown in FIG. 2, air 85 is pressurized by an air compressor 83 to pressurize the lock hopper 3. According to this prior art, construction costs and operating power can be saved by eliminating the nitrogen separator 9 shown in FIG.

However, with this technology, since the pulverized coal supply gas contains oxygen, it cannot be said that there is no possibility of backfires or coal dust explosions from the coal gasifier 10. As a chemical reactor, there are many issues that need to be developed.

In a pulverized coal-fired boiler, the powder is supplied by blowing air into it, but in a pulverized coal-fired boiler, the combustion gas is sucked in by a blower to create a pressure inside the boiler that is slightly lower than atmospheric pressure. Because of this, there is no possibility of backfire from the boiler. Regarding coal dust explosions, basic experimental data under atmospheric pressure has been accumulated, and it is known that the explosion range of pulverized coal is 30 to 4 og/m'', and the supply of pulverized coal is Coal is supplied with increased pulverized coal concentration above the range of ~40 g/m''.

In addition, with regard to operations during load changes, start-up, and shutdown, based on our experience in operating numerous pulverized coal-fired boilers, we are able to operate without entering the explosive range, including during transient conditions.

On the other hand, in a pressurized gasifier, the gasifier is heated to several tens of atmospheres.
Since the gasification reaction is carried out under a high pressure of i, there is a possibility of backfire in the supply system from the gasifier and an explosion caused by this. In particular, the lock hopper needs to be operated in a switching manner in order to continuously supply pulverized coal, and when the lock hopper is pressurized and the outlet switching valve is opened, the lock hopper must be sufficiently high above the gasifier. However, the pressure gradually decreases, and just before switching to another lock hopper, the pressures in the gasifier 10 and lock hopper 3 are almost balanced, and there is a risk of backfire. be.

Regarding coal dust explosions, in the case of pulverized coal boilers, pulverized coal can be continuously supplied by an air supply fan, and the pulverized coal purity can be maintained outside the range of coal dust explosions. When supplying pulverized coal to a pressurized gasifier, it is necessary to perform switching operation of the lock hopper, and the pulverized coal concentration will pass through the explosive range during the pulverized coal supply process, so
It is difficult to supply pulverized coal beyond the explosion range.

For the reasons mentioned above, using air to boost the pressure of the lock hopper 3 is very problematic in terms of safety, and is especially important for gasification furnaces in power generation gasification power plants where reliability is important. Regarding the possibility of supplying coal with air, we are currently only considering the possibility of this, and in terms of practical application,
It is common to use a gas that does not contain oxygen.

FIG. 3 shows the supply of coal by bypassing a part of the exhaust gas 67 of the exhaust heat recovery boiler 46 and further supplying the coal to the exhaust gas compressor 86.
The exhaust gas is pressurized and supplied to the lock hopper, but since this exhaust gas contains about 10 to 15% oxygen, the oxygen concentration is lower than when using air (oxygen concentration 21%) as shown in Figure 2. Although the possibility of backfires and coal dust explosions is reduced by the smaller amount, there is a safety problem similar to the prior art shown in FIG. 2.

[Purpose of the invention]

An object of the present invention is to provide a coal gasification combined cycle power generation plant using a pressurized coal gasifier, in which the pressurization of a coal supply device, typically a lock hopper, separates CO2 from gas purification, or Combustion gas obtained by combusting off-gas from a sulfur recovery device in a catalytic combustor, or purified gas that is further purified, for example, purified gas obtained by removing most of the sulfides such as sulfur and hydrogen sulfide in a reactor filled with zinc oxide. When using an entrained bed gasifier, the steam generated by the gasifier is superheated by a steam generator at the outlet of the gasifier, thereby eliminating concerns about pack fires or coal dust explosions from the gasifier. It is an object of the present invention to provide a method and apparatus that can perform safe and economical coal supply without having to worry about it.

[Summary of the invention]

In a coal gasification combined cycle power plant using a pressurized gasifier, the gas required to pressurize the coal feeder, typically a lock hopper, is separated from the oxygen generator when an oxygen blowing furnace is used. A safe and economical coal supply system can be constructed using nitrogen from the coal supply system. On the other hand, when using an air blowing furnace, there is no oxygen generator, so it is not economical to construct a safe coal supply system using nitrogen. Therefore,
As the pressurized gas, air or exhaust heat recovery boiler 1
By using exhaust gas, it is possible to construct an economical coal supply system, but since a pressurized gasifier is used, there is a possibility of backfire from the gasifier and coal dust explosion in the coal supply system. There are problems in terms of safety.

The present invention supplies coal to a coal gasification combined cycle power plant using an economically superior and safe pressurized gasifier using an inert gas for coal generated and separated within the system. METHODS AND APPARATUS.

As a method of supplying inert gas to coal, firstly, when using an air-blown gasifier, the gas is supplied downstream of the desulfurization equipment.
The idea is to install a carbon dioxide absorption device and use separated and recovered carbon dioxide.

Second, when an air oxidation gasifier is used, the tail gas of the sulfur recovery device is combusted in a catalytic combustor, and a gas containing nitrogen as a main component is recovered and used as a cooling heat.

Thirdly, when using an air-blown entrained bed gasifier,
The steam generated in the gasifier is superheated by a steam generator at the outlet of the gasifier and then used.

Fourth, air-blown gasification furnace, oxygen-blown gasification
Although it is applicable to the case where any of the six gasifiers is used, the purified gas after desulfurization is further precisely desulfurized and used.

As a result, by using an inert gas for coal separated from the system of a coal gasification combined cycle power plant,
Coal supply to the coal gasifier is safe and economical since there is no backfire from the gasifier or coal dust explosion in the supply system, and the power required for generating and pressurizing inert gas can be saved. METHODS AND APPARATUS.

[Embodiments of the invention]

FIG. 4 shows an example of Embodiment 1 of the present invention.

The basic plant configuration is the same as the conventional technology shown in FIGS. 1 to 3.

The gasifier uses an air-blown, pressurized gasifier.

In this embodiment, a decarboxylation device 75 is installed to absorb the carbon dioxide contained in the purified gas 28 at the outlet of the desulfurization device 23, and the carbon dioxide separated from the regeneration tower 77 that regenerates the absorbed liquid is removed. Inert gas 80, which is the main component, is pressurized by a boost compressor 81 and is supplied to the lock hopper.

The gas purification equipment in this embodiment includes a water washing tower 22 and a physical absorption desulfurization tower 23, which are installed for the purpose of removing dust and sulfur compounds from the crude gas.

As gas purification equipment, in addition to the wet method used in this example, there is also a method called a dry method that uses iron oxide as an absorbent.

The gasifier crude product gas 21 typically contains sulfur compounds of 500 to 3000 P, although this varies greatly depending on the properties of the coal used. However, in the wet method, an absorption liquid that selectively absorbs sulfur compounds is used, so the purified gas contains crude gas 21050~
90% will remain.

The carbon dioxide remaining in this purified gas 28 is removed by a decarboxylation tower 7
At step 5, the amount of coal necessary for supplying coal is absorbed by contact with the absorption liquid. The absorption liquid that has absorbed carbon dioxide is sent to the regeneration tower 7
7, where it is depressurized and heated to separate the absorbed carbon dioxide, regenerated, and recycled for reuse. In this process, regeneration tower 7
Carbon dioxide is separated from 7.

In this example, the concentration of sulfur compounds in the crude gas 21 is 12
In the process of absorbing and removing 00F in the physical absorption desulfurization device 23 to reach 200F, 15% of carbon dioxide was absorbed. . Purified gas 28 contains 7.3% carbon dioxide;
This amount is approximately 100,000 Nm3/H in this example with a plant output of 10,100O. On the other hand, the gas required to supply coal is approximately 20,000 N m3/H. Therefore, in this embodiment, carbon dioxide in the purified gas is further removed in the decarboxylation tower 75 installed on the downstream side using the same absorbent as that used in the desulfurization device 23. 21 was absorbed and regenerated and separated in a regeneration tower 77. In the decarboxylation tower 75, the same absorbent is used because the sulfur concentration in the purified gas is low and the proportion of sulfur compounds that are difficult to absorb into the absorption liquid is relatively increased compared to the crude gas 21. Even when used, only about half of the sulfur compounds were absorbed, and a regeneration gas containing about 95% carbon dioxide and about 4% nitrogen could be obtained. In this example, since the regeneration gas contains sulfur compounds,
In order to prevent corrosion of the booster compressor 81, lock hopper 3, and feed tank 4, a precision desulfurization device 95 is installed to supply sulfur compounds at IP level. The precision desulfurization device 95 is
This example consists of a converter for converting carbonyl sulfide into hydrogen sulfide and a reactor filled with zinc oxide. Note that this precision desulfurization device 95 has a proven track record in oil refinery plants.

According to this embodiment, since the pressurized gas in the lock hopper 3 does not contain oxygen, backfire from the gasifier 10 and coal dust explosion in the coal supply system such as the lock hopper 3 and the feed tank 4 occur. It is possible to construct a safe coal feeding system without any danger.

In addition, compared to separating nitrogen using a nitrogen separator and pressurizing the lock hopper by increasing the pressure, separating carbon dioxide can save approximately 6,000 kW of operating power in a 10,100 O combined coal gasification combined cycle power plant, making it more economical. I'll go.
1) Example 2 FIG. 5 shows 20 examples of the present invention.

In this embodiment, the tail gas 33 of the sulfur recovery device 32 is oxidized in the catalytic combustor 68 to produce a gas containing nitrogen and carbon dioxide as main components, and after heat recovery by the heat exchanger 70,
The pressure is increased by a boost compressor 72 and supplied to the lock hopper 3.

In the prior art shown in FIGS. 1 to 3, the tail gas 33 of the sulfur recovery device 32 is combusted in the combustor 35 and then mixed with exhaust gas from the exhaust heat recovery boiler 46 and discharged from the chimney. This is because the tail gas contains harmful substances such as -carbon oxide, hydrogen, and hydrogen sulfide, and therefore, when it is discharged outside the system, it is necessary to burn and oxidize the harmful substances.

In this embodiment, by self-combusting the tail gas 33 at a low excess air ratio in the catalytic combustor 68, the exhaust gas contains almost no oxygen, in this embodiment about 0.1% -carbon oxide. It was possible to generate a gas that is inert to coal, which is the main component. The production amount was 30,000 Nm3/H in a 10,100O class plant, and the flow rate necessary for coal supply was secured.

Using a conventional combustor - to burn carbon oxide, hydrogen, hydrogen sulfide, supplying auxiliary fuel and under conditions of excess air,
Since it is necessary to raise the temperature to a high temperature of 500 to 5 ooc or more, the combustion exhaust gas 36 contains 2 to 10% oxygen, so using this combustion gas 36 for coal supply is a safety issue, as in the conventional technology. This is because there is a problem above.

On the other hand, when the catalytic combustor 68 filled with a combustion catalyst used in this embodiment is used, carbon oxide, hydrogen, and hydrogen sulfide are naturally generated at a temperature of 300 to 4000°C, so the oxygen concentration in the combustion exhaust gas is This combustion gas 71 can be used to safely supply coal.

Furthermore, according to this example, compared to the conventional technology shown in FIG. 1 which performs nitrogen separation, the power consumption of the nitrogen separation apparatus can be saved by 8000 kW in a 10100O class plant.

In this embodiment, instead of the catalytic combustor 68, the
A similar system can be constructed using the tail gas after desulfurization using the precision desulfurization equipment used in .

In addition, in this example, the precision desulfurization equipment used in Example 1 lowers the sulfur compound concentration to about 5P in advance, and then performs catalytic combustion to release it directly into the atmosphere. However, it has the advantage that it can generate an environmentally safe inert gas, and can be used for equipment seals or systems where atmospheric release is essential.

Example 3 @6 Figure shows an example of Embodiment 3 of the present invention.

Particularly, in a coal gasification combined cycle power plant using an entrained bed pressurized gasifier, the reaction heat in the gasifier 10 is recovered as steam using the gasifier 10 as a water-cooled wall.

When using a pressurized gasifier, in order to reduce the heat load on the furnace wall, heat is recovered as saturated steam that is slightly higher than the gasification pressure, thereby lowering the metal temperature of the furnace wall and increasing the conversion of gas to steam. It is common to have a highly reliable system configuration that prevents contamination.

In this example, saturated steam with relatively low pressure is further used.
The gasifier outlet steam generator 15 overheats the steam to prevent condensation of the steam due to heat radiation in the lock hopper 3, feed tank 4, and coal supply system. In this example, in a part of the gasifier 10 that has a particularly high heat load, 40 kg
The steam recovered as saturated steam of 350 t:' is heated to 350 t:' in the gasifier outlet steam generator 15 and then supplied.

The steam supplied to the gasifier 10 is
When almost no reaction occurs and wet gas purification is used,
In the process of gas purification, it is removed, and throughout the plant,
This is a loss, but when converting this loss into auxiliary power, it is 1
For a 0100O plant, the operating power is approximately 3,500kW, and the operating power can be saved by approximately 8,000kl compared to the method shown in Fig. 1, which uses nitrogen separately.

Moreover, since 350C steam is inert to coal, it is possible to configure a coal supply method without the possibility of pack fire or coal dust explosion.

Example 4
FIG. 7 shows an example of Embodiment 4 of the present invention.

In this embodiment, the purified gas 28 is passed through a precision desulfurization device 95.
Sulfur compounds are absorbed and purified, and the pressure is increased using a booster compressor.

The refined gas contains sulfur compounds of 50 to 500F, and in order to prevent corrosion of the booster compressor due to these sulfur compounds, a precision desulfurization equipment is used to remove sulfur compounds from 1 to IJ.
It was decided to remove it to about pl.

As the precision desulfurization device, a device similar to that used in Example 1 can be applied.

In this embodiment, the boost pressure of the boost compressor 94 is
~2, and the conventional examples shown in Figures 1 to 3, purified gas 2
8 pressure is reduced because it is in a pressurized state, and the required power can be extremely small, about 1000 kW, for a 10100 O class plant, which is very economical.

Further, the purified gas 28 is a gas whose main components are -carbon oxide, hydrogen, and nitrogen, and at a purification temperature of OC to 200C,
It is inert to coal, and it is possible to construct a safe device without backfire from the gasifier or coal dust explosion.

〔Effect of the invention〕

According to the present invention, by supplying pulverized coal to the gasifier using an inert gas generated and separated from within the system of a coal gasification combined cycle power plant, backfire from the gasifier and coal supply system can be prevented. A safe coal supply device without the possibility of coal dust explosion can be constructed.

Moreover, FIG. 10 shows the operation of the coal supply device of the present invention.

Showing the effect of force reduction. The operating power of a coal gasification combined cycle power plant with a sending end output of 10,100 O is shown.

In the method of using separated nitrogen using a nitrogen separator shown in FIG. 1, the operating power is the nitrogen separator operating power 100 and the nitrogen compressor power 101.

On the other hand, in Examples 1 to 3, the power to boost the pressure of the inert gas was
%Z is the same as the conventional technology, and in Example 1, the operating power is approximately 6,000 yen by using the carbon dioxide separator.
kW, in Example 2.3, approximately 8000 kl1 of the power of the nitrogen separator can be saved. In Example 2, approximately 200 kW can be further saved by recovering heat from the combustion gas.

In addition, in the fourth embodiment, the power required for boosting the pressure can also be saved, which is about 1100 kW compared to the conventional technology shown in FIG.

Approximately 2500 kW of operating power can be saved compared to Examples 1 to 3.

[Brief explanation of drawings]

1 to 3 are system diagrams showing the cycle configuration of a conventional combined coal gasification combined cycle power plant. FIG. 4 shows the first embodiment of the present invention, FIG. The figure shows Example 3
FIG. 7 shows Example 4. 1... Pulverized coal, 2... Coal storage tank, 3... Lock hopper, 4... Feed tank, 5... Pressurized pulverized coal, 6... Pressurized nitrogen, 7...Nitrogen booster compressor, 8...Nitrogen, 9...Nitrogen separation device, 10
...Gasifier, 11...Gasifier outlet crude gas,
12...Gasifier 1 Steam generator, 1
3... Gasifier steam generator water supply, 14... Gasifier steam generator generated steam, 15... Gasifier outlet steam generator, 16... Gasifier outlet steam generator water supply,
17...Gasifier outlet steam generator steam drum, 18
...Steam generated by the gasifier outlet steam generator, 19...
Gasifier outlet steam generator outlet crude product gas, 20...
Gas/gas heat exchanger, 21... Gas/gas heat exchanger outlet crude gas, 22... Dust removal device, 23... Desulfurization device, 24... Desulfurization agent regeneration device, 25... Desulfurizing agent circulation pump, 26... Heat exchanger, 27... Dedusting device outlet gas, 28... Desulfurizing device outlet purified gas, 2.9...
Absorption desulfurization agent, 30... Regenerated desulfurization agent, 31... Regeneration gas, 32... Sulfur recovery device, 33... Tail gas,
34... Sulfur, 35... Combustor, 36... Combustion exhaust gas, 37... Fuel gas, 38... Gas turbine combustor, 39... Air, 40... Pressurized air, 41・・・
・Air cooler, 42... Pressurized air, 43... Air boost compressor J44... Pressurized air, 45... Gas turbine exhaust gas, 46... Exhaust heat recovery boiler, 47... Superheater , 48... Reheater, 49... High pressure evaporator, 50...
...High pressure drum, 61...High pressure economizer, 52...Low pressure evaporator, 53...Low 1) Pressure drum, 54
...Low pressure economizer, 55...Main steam, 56...Reheat steam, 57...Low temperature reheat steam, 58...Steam turbine, 59...Steam turbine generator, 60... ...Condenser, 61... Water supply pump, 62... Exhaust heat recovery boiler water supply, 63... Exhaust heat recovery boiler water supply, 64... Gasifier outlet steam generator water supply, 65... water supply boost pump,
66...Gasifier steam generator water supply, 67...Exhaust heat recovery boiler exhaust gas, 68...Catalytic combustor, 69...
Catalytic combustor exhaust gas, 70... Feed water heater, 71...
Catalytic combustor exhaust gas, 72... Catalytic combustor exhaust gas compressor, 73... Boosting catalyst combustor exhaust gas, 74... Pulverized coal pressurized steam, 75... Decarboxylation device, 76... Decarboxylation Equipment outlet purified gas, 77... Absorbent regeneration device, 78...
・Heat exchanger, 79...Absorption liquid circulation pump, 80...
Carbon dioxide gas, 81... Carbon dioxide gas booster compressor, 82...
Boosted carbon dioxide gas, 83...Air boost compressor, 84...
Pressurized air, 85... Air, 86... Exhaust heat recovery boiler boost compressor, 87... Pressurized exhaust heat recovery boiler exhaust gas, 9
0... Gas turbine, 91... Gas turbine compressor, 92... Gas turbine power, 101... Required power for nitrogen pressure increase, 102... Required power for carbon dioxide gas separation device,
103... Required power for carbon dioxide boost compressor, 104...
・Required power for boosting the pressure of the catalytic combustor, 105...Thermal efficiency improvement due to feed water heating, converted to in-station labor, 106...Decrease in output due to steam extraction 1, converted to in-house power, 107...Required power for purified gas booster .

Claims (1)

[Claims] 1. A coal gasification plant consisting of a pressurized, air-blown coal gasification furnace, a steam generator, and a gas purification device, and a combined power generation plant consisting of a gas turbine, an exhaust heat recovery boiler, and a steam turbine. In a combined coal gasification combined cycle power plant, when dry coal is supplied to the coal as pulverized coal, the pulverized coal supply device is supplied with a gas containing carbon dioxide as its main component, which is separated from the gas purification device, or with a sulfur recovery device. A coal supply method for a coal gasification power plant, characterized in that pulverized coal is supplied by supplying tail gas or steam generated from a gasifier. 2. In claim 1, after the sulfur content in the crude gas produced by the gasifier is removed in a desulfurization device, a carbon dioxide absorption device is further installed to make carbon dioxide the main component. A coal supply method for a coal gasification power plant, characterized in that gas is separated, pressurized, and supplied to a pulverized coal supply device. 3. Claim 1 states that the off-gas of the tail gas treatment device that processes the tail gas of the desulfurization agent regeneration device of the desulfurization device that removes the sulfur content in the crude gas produced by the gasification furnace is pressurized to produce pulverized coal. A coal supply method for a coal gasification power plant that can supply pulverized coal to a coal gasifier by supplying it to a supply device. 4. In claim 1, regarding a coal gasification combined cycle power plant using an entrained bed gasifier, pulverized coal is produced by pressurizing a lock hopper using steam generated in the gasifier. A coal supply method for a coal gasification power plant that can supply coal to a coal gasification furnace. 5. Coal is pulverized in a coal gasification plant consisting of a pressurized coal gasification furnace, steam generator, and gas purification, and a coal gasification combined cycle power plant consisting of a gas turbine, exhaust heat recovery boiler, and steam turbine. A coal supply device for a coal gasification power generation plant, characterized in that a part of purified gas at a gas purification outlet is further pressurized and used for supplying pulverized coal.