JP4533764B2 - Pressurized coal gasification furnace and coal gasification combined cycle power generation facility - Google Patents

Description

  The present invention relates to a pressurized coal gasification furnace and a coal gasification combined power generation facility.

  A solid carbon raw material such as coal is put into a gasification furnace at a high temperature under a pressurized atmosphere, and the combustible component of the raw material is gasified and heat recovered, and the slag, which is the ash content of the raw material, is added to the bottom of the gasification furnace. There is known a coal gasifier that is put into a cooling water reservoir and slag is crushed and discharged (refer to Patent Document 1). In addition, monitoring tanks that detect the flow of slag using images and acoustic signals, such as a camera that monitors images and a falling sound collector that collects falling sounds of slag, are installed in water tanks for slag breaking. (Reference to Patent Document 2). A circulation cooling system for slag water is installed in the water tank for the purpose of cooling protection of this monitoring device and prevention of flushing of slag water during slag discharge.

For example, there is one shown in FIG. 7 as a pressurized coal gasifier that the applicant has proposed so far. The slag water circulation channel of the water tank 4 of this pressurized coal gasification furnace leads the slag water discharged from the water tank 4 to the slag precipitation tank E under atmospheric pressure, and precipitates and removes slag mixed in the slag water, Water from the water tank F is pumped up by the booster pump A, and is circulated and supplied to the water tank 4 of the gasifier 3 through the filter B, the cooler C, the slag water pump D, the circulating water flow meter F1, and the circulating water flow rate control valve CV1. The water in the water tank 4 was cooled by supplying the water cooled by the cooler C to the water tank 4.
7, 5 is a water supply pipe, 6 is a drain pipe, T1 is a slag hopper water outlet thermometer, T2 is a cooler outlet thermometer, L1 is a water level gauge, CV2 is a water level control valve, 11 is a lock hopper, 12 Reference numerals 13 and 13 indicate open / close valves, and arrows a indicate melting slag.

However, the slag water flowing through such a slag water circulation passage naturally contains slag, and some slag components remain in the water after the filtration of the filter B. When draining from 3 to atmospheric pressure or when supplying water to the gasification furnace 3 from atmospheric pressure, the downstream side of the control valve and the pump are worn and damaged due to flushing, and they are operated continuously for a long time. There was a problem that could not be obtained.
Moreover, the inside of the furnace is 1 to 10 MPa, and it is necessary to increase the feed water pressure so as to meet the same pressure. The slag feed pump D for this purpose is composed of a high-capacity high-capacity high-lift pump and a pump in multiple stages in series. It was necessary to use what was installed, leading to higher costs.

Japanese Patent Laid-Open No. 7-109471 (FIG. 1) Japanese Patent Laying-Open No. 2004-91571 (FIG. 1)

  In view of the above-mentioned problems, the present invention provides a pressurized coal gasification furnace that enables the adoption of a general-purpose low-lift pump, prevents control valves and pumps from being damaged by flushing, and reduces maintenance costs and equipment costs. It is an object of the present invention to provide a combined coal gasification combined power generation facility that generates electricity by effectively utilizing gas generated from the pressurized coal gasification furnace.

In order to solve the above problems, the present invention proposes the following means (1) to (6) .
(1) A first means is provided in a gasification furnace that heat-treats a coal raw material under pressure to gasify combustible components of the coal raw material to generate gas, and is provided on an upper portion of the gasification furnace. A gas discharge passage for guiding the gas generated in the gasification furnace to a heat exchanger, a water tank provided at the bottom of the gasification furnace, for water granulating slag that is an ash content of the coal raw material, A slag discharge valve that discharges slag that settles at the bottom of the water tank to the outside of the system, and the other end of the water supply pipe and the drain pipe provided in the water tank communicate with each other, and does not have an atmospheric pressure open end, and piping It is characterized by comprising a closed circulation channel in which the channels communicate in series, a circulating water cooler and a circulation pump provided in the circulation channel .

(2) The second means is a pressurized coal gasification furnace according to the first means, wherein a water temperature detection device is provided in the water tank or the circulation flow path, and a temperature signal from the water temperature detection device is used. The temperature adjusting means for adjusting the water temperature to 30 ° C. to 70 ° C. is controlled.
As the temperature adjusting means, the circulating water flow rate to the water tank may be increased or decreased, or the cooling capacity of the cooler may be varied.

(3) The third means is a pressurized coal gasification furnace according to the second means, wherein a circulating water flow rate control valve is provided in the circulation flow path, and the circulating water flow rate is determined by a temperature signal from the water temperature detection device. The control valve is controlled to open and close.

(4) The fourth means is characterized in that, in the pressurized coal gasifier according to the second means, the discharge capacity of the circulation pump is increased or decreased by a temperature signal from the water temperature detection device.

(5) The fifth means is characterized in that, in the pressurized coal gasifier according to the second means, the refrigerant flow rate of the cooler is controlled to increase or decrease by a temperature signal from the water temperature detection device.

(6) A coal gasification combined cycle facility according to a sixth means includes a pressurized coal gasification furnace according to any one of (1) to (5) , and a gas discharge flow of the pressurized coal gasification furnace A heat exchanger provided in the passage, a dust removing device for removing dust in the gas, a gas turbine driven by the gas from the dust removing device, and an exhaust heat recovery boiler for generating steam by the exhaust gas of the gas turbine; And a steam turbine driven by steam generated from the heat exchanger and the exhaust heat recovery boiler, and generating electric power by the driving force of the gas turbine and the steam turbine.

The pressurized coal gasification furnace according to claim 1 comprising the first means is a closed circulation channel, so that the difference between the pump inlet and outlet is different from the conventional one that was an open circulation channel. The pressure is reduced, a conventional large-capacity high-lift pump is not required, a low-lift circulation pump can be used, and cost reduction can be achieved. In addition, since the amount of slag water discharged from the high-pressure gasifier to atmospheric pressure is less than before, the piping and pumps in the circulation channel are essentially less likely to wear, enabling the gasifier to operate continuously for a long time. It becomes.
Cooling of circulating water using a cooler and continuous circulating water supply using a circulating pump keeps the water temperature in the gasification furnace tank low, so that slag monitoring equipment can be maintained and slag water flushing is prevented. As a result, maintenance costs for pumps and piping can be reduced. Moreover, since slag water is circulated and used, the amount of water used can be reduced, and the burden on the wastewater treatment facility can be reduced.

  The pressurized coal gasification furnace according to claim 2, comprising the second means, has the effects of the first means, and the water temperature in the water tank even if the load and operating conditions of the gasification furnace fluctuate. Can always be maintained at an appropriate set temperature, the temperature of the water in the water tank can be accurately controlled, the gasifier can be stably controlled, and the maintenance cost can be reduced.

  The pressurized coal gasifier according to claim 3, comprising the third means, has the effect of the second means, and controls the opening and closing of the circulating water flow rate control valve so that the water tank of the gasification furnace is provided. The amount of water to be supplied can be increased or decreased, the water temperature in the water tank can be maintained and adjusted to the set temperature, and stable control operation of the gasifier can be performed. Further, when the circulating water flow rate control valve is throttled, the circulation pump power can be reduced.

  The pressurized coal gasification furnace according to claim 4, comprising the fourth means, has the effect of the second means, and controls the increase or decrease of the discharge capacity of the circulation pump, thereby allowing the water tank of the gasification furnace. The amount of water to be supplied can be increased or decreased, the water temperature in the water tank can be maintained and adjusted to the set temperature, and stable control operation of the gasifier can be performed.

  The pressurized coal gasification furnace according to claim 5, comprising the fifth means, has the effect of the second means, and controls the refrigerant flow rate of the cooler to increase or decrease, thereby allowing the water tank of the gasification furnace to The temperature of the supplied water can be adjusted, the water temperature in the water tank can be maintained and adjusted to the set temperature, and the gasifier can be stably controlled.

The combined coal gasification combined cycle facility according to claim 6 comprising the sixth means has the effect of any one of the pressurized coal gasification furnaces according to the first to fifth means, and the pressurized coal gasification The gas energy of the generated gas generated by the furnace can be efficiently and effectively used, and power can be generated stably over a long period of time.

  A pressurized coal gasification furnace and a coal gasification combined cycle facility according to the present invention will be described with reference to FIGS.

FIG. 1 to FIG. 4 are each an example diagram mainly showing a circulation channel of slag water in a pressurized coal gasification furnace according to the present invention, and FIG. 1 is a circulation channel diagram of a water tank according to Example 1, 2 is a circulation channel diagram of the water tank according to the second embodiment, FIG. 3 is a circulation channel diagram of the water tank according to the third embodiment, and FIG. 4 is a circulation channel diagram of the water tank according to the fourth embodiment.
FIG. 5 is an overall system diagram showing the coal gasification combined power generation facility according to the present invention, and FIG. 6 is a flow chart showing another example of the filter device according to the first to fourth embodiments.

Example 1 of the pressurized coal gasifier according to the present invention will be described with reference to FIGS. 1 and 5.
As shown in FIG. 1 for a part of the pressurized coal gasification furnace 2 and as shown in FIG. 5 for the whole structure, the gas supplied from the coal raw material supply pipe 3a is heat treated under pressure and gasified. Heat exchange provided in the gasification furnace 3, the water tank 4 provided at the bottom of the gasification furnace 3 for granulating slag, and the gas discharge passage 16 for the gas generated in the gasification furnace 3 And a device 17.
As the coal raw material, finely powdered carbon is introduced, and coal char collected by the cyclone filter 18 of FIG.

  The water tank 4 is provided with a water supply pipe 5 for supplying water and a drain pipe 6 for draining slag water. The other ends communicate with each other, and a closed circulation path 7, that is, an atmospheric pressure open end. The closed flow path in which the piping flow path communicates in series is formed. The circulation channel 7 includes a circulating water cooler 8, a circulation pump 9, a filter device 10 that can be automatically cleaned online, a slag hopper water outlet thermometer T1 that is a water temperature detection device, and a cooler outlet for channel monitoring. A circulating water flow meter F1 is provided for monitoring the performance (wear) of the thermometer T2 and the circulation pump 9 and for monitoring that the water level control valve CV3 is open but water is not flowing in the flow path.

  The filter device 10 has an automatic cleaning function. As an example, the automatic cleaning mechanism is such that the cylindrical mesh filter 10a in the case is axially rotated by the motor M, and the mesh filter 10a faces the slag discharge opening of the case. In some cases, slag is backwashed out of the system by water, and the slag surface of the mesh filter 10a is always kept clean with the rotation of the shaft.

  Further, the water tank 4 is provided with a slag hopper water level gauge L1, and the opening degree of the water level control valve CV2 or the water level control valve CV3 is adjusted and controlled by the level signal a from the slag hopper water level gauge L1. The water level is always higher than the water supply pipe 5 and the drain pipe 6, and the inside of the circulation channel 7 is always filled with water. When there is not enough water in the water tank 4 and the circulation channel 7 due to evaporation or the like, the water level control valve CV3 is opened, and makeup water is supplied from the makeup water pump 14 to the water supply pipe 5 of the water tank 4. Further, when water in the water tank 4 and the circulation channel 7 system becomes excessive due to inflow of pump shaft seal water or the like, the water level control valve CV2 is withdrawn. The flow rate of the circulating water (slag water) in the circulation flow path 7 is set to a flow rate that does not cause clogging, and a minimum amount of water is supplied to the circulation pump 9, and the water is increased if the slag amount increases.

A lock hopper 11 that temporarily stores slag is provided via a slag valve 12 at the bottom of the water tank 4, and a slag discharge valve 13 is provided below the lock hopper 11. When discharging the slag that settles in the water tank 4, the slag valve 12 is opened, the slag is stored in the lock hopper 11, the slag valve 12 is closed, the slag discharge valve 13 is opened, and the slag is recovered. Drain outside.
Thus, the coal raw material input from the coal raw material supply pipe 3a shown in FIG. 5 is generated in the gasification furnace 3 as a gas rich in carbon monoxide and hydrogen. The ash content of the coal raw material becomes molten slag and falls in the direction of arrow a in FIG. 1, and the molten slag is rapidly cooled in the water tank 4 and crushed.

The water cooled by the cooler 8 is circulated and supplied so that the water temperature in the water tank 4 does not exceed the boiling point temperature at atmospheric pressure. Since slag is mixed in the slag water discharged from the water tank 4, the slag and the like are filtered by the filter device 10 before reaching the circulation pump 9, and the slag water is removed from the system from the slag discharge pipe 10b of the filter device 10 or FIG. To the pipe of the coal raw material supply pipe 3a shown in FIG.
The filter device 10 may be provided on the downstream side of the circulation pump 9 as long as the circulation pump 9 is wear resistant, and may not be installed depending on circumstances. When the cooler 8 is a tube heat exchanger or a plate heat exchanger, a filter device may be provided at the inlet. The slag hopper water level gauge L1 is of a differential pressure type, but may be of a pressure type measured at one point.

In this embodiment, since the closed circulation channel 7 is used, it is not necessary to increase the pump pressure by installing multiple stages of large-capacity high-lift pumps and pumps as in the prior art, and a low-head general-purpose circulation pump 9 is used. Therefore, it is possible to achieve a reduction in device manufacturing cost and, in turn, delivery spare part cost.
Further, since the amount of slag water discharged from the high-pressure gasification furnace 3 to the atmospheric pressure is almost smaller than that in the past, the piping of the circulation flow path 7 and the circulation pump 9 are essentially less likely to wear, and the gasification furnace 3 There is an effect that long-term continuous operation is possible. Further, since the slag water is circulated and used, the amount of water used can be reduced, and the burden on the wastewater treatment facility can be reduced, which is also preferable from the environmental considerations. In addition, since the water temperature in the water tank 4 is controlled to be equal to or lower than the boiling point temperature at atmospheric pressure (100 ° C. or less under 1 atm), the flushing phenomenon does not occur, and wear damage to the piping system due to the phenomenon can be prevented. .

Next, based on FIG. 2, Example 2 of the pressurized coal gasifier according to the present invention will be described.
In the present embodiment, the gasification furnace 3, the water tank 4, the circulation flow path 7, and the like are the same as those in the first embodiment, but the circulating water is detected by the temperature signal b from the slag hopper water outlet thermometer T1. A temperature adjusting means for controlling the opening degree of the flow control valve CV1 is added. The control by the slag hopper water outlet thermometer T1 is controlled to a temperature below which the water in the water tank 4 does not boil, and the range of 30 ° C. to 70 ° C. is set at the installation position of the slag hopper water outlet thermometer T1. When the set temperature is exceeded, the circulating water flow rate control valve CV1 is opened, and when the set temperature falls below the set temperature, the circulating water flow rate control valve CV1 is controlled in the valve closing (throttle) direction. Note that setting the set temperature to the high temperature side rather than the low temperature side requires a small amount of circulating water, and as a result, the amount of water contaminated by use can be reduced.

When the water temperature in the water tank 4 exceeds the boiling point temperature at atmospheric pressure, wear on the piping system, in particular, the slag discharge valve 13 of the lock hopper 11 becomes a problem due to a flash phenomenon that occurs when slag is discharged out of the system. However, the problem is solved by temperature control of the water temperature in the water tank 4 of the present embodiment. Further, in the present embodiment, the filter 10a is less clogged and difficult to close, and when the circulating water flow control valve CV1 is controlled in the throttle direction, the pressure loss increases and flows through the circulation pump 9. Since the amount of water is reduced, there is an effect of reducing the power of the circulation pump 9.
In this embodiment, the amount of circulating water can be set to the minimum necessary amount, and when the water temperature in the water tank 4 is kept at a set temperature of 30 ° C. to 70 ° C., the slag has a relatively small particle size. It can be granulated into particles.

A third embodiment of the pressurized coal gasifier according to the present invention will be described with reference to FIG.
In this embodiment, the gasification furnace 3, the water tank 4, the circulation flow path 7 and the like are the same as those in the first embodiment, but the inverter receives the temperature signal d from the slag hopper water outlet thermometer T1. A temperature adjusting means for adjusting the drive of the circulation pump 9 and increasing / decreasing the pump discharge amount is added by a 15-control motor M. Further, instead of the inverter 15, a variable speed joint such as a fluid joint may be used.

The control by the slag hopper water outlet thermometer T1 is performed so that the water temperature in the water tank 4 does not exceed the boiling point temperature at atmospheric pressure, and is in the range of 30 ° C. to 70 ° C. at the installation position of the slag hopper water outlet thermometer T1. Is set to a set temperature, and when the set temperature is exceeded, the circulation pump 9 is driven and the amount of circulating water is increased. When the set temperature is below the set temperature, the drive of the circulation pump 9 is lowered and the amount of circulating water is reduced. The water temperature in 4 is set to be equal to or lower than the boiling temperature at atmospheric pressure.
When the water temperature in the water tank 4 exceeds the boiling point temperature at atmospheric pressure, wear on the piping system, in particular, the slag discharge valve 13 of the lock hopper 11 becomes a problem due to a flash phenomenon that occurs when slag is discharged out of the system. However, the thing of the present Example is solving the problem by controlling the temperature so that the water temperature in the water tank 4 may not exceed the boiling point temperature in atmospheric pressure by increasing / decreasing the circulating water flow rate.
In this embodiment, the amount of circulating water can be set to the minimum necessary amount, and when the water temperature in the water tank 4 is kept at a set temperature of 30 ° C. to 70 ° C., the slag has a relatively small particle size. It can be granulated into particles.

Based on FIG. 4, Example 4 of the pressurized coal gasification furnace which concerns on this invention is demonstrated.
In this embodiment, the gasification furnace 3, the water tank 4, the circulation flow path 7 and the like are the same as those in the first embodiment, but are cooled by the temperature signal c from the slag hopper water outlet thermometer T1. A temperature adjusting means for controlling the opening degree of the refrigerant flow rate control valve CV4 provided in the refrigerant flow path 8a of the vessel 8 is added.
The control by the temperature signal c from the slag hopper water outlet thermometer T1 is performed so that the water temperature in the water tank 4 does not exceed the boiling point temperature at atmospheric pressure, and is 30 ° C. at the installation position of the slag hopper water outlet thermometer T1. The temperature range of ˜70 ° C. is set as the set temperature. When the set temperature is exceeded, the refrigerant flow control valve CV4 is controlled in the valve opening direction, and when the set temperature is below the set temperature, the refrigerant flow control valve CV4 is controlled in the valve closing (throttle) direction. To do.

That is, when the refrigerant flow control valve CV4 of the cooler 8 is opened, a large amount of refrigerant flows and the circulating water flowing through the cooler 8 is strongly cooled. Conversely, when the refrigerant flow control valve CV4 is controlled to close, the circulating water Cooling will be weakened, and the water temperature in the water tank 4 can be controlled below the boiling point temperature at atmospheric pressure.
When the water temperature in the water tank 4 exceeds the boiling point temperature at atmospheric pressure, wear on the piping system, in particular, the slag discharge valve 13 of the lock hopper 11 becomes a problem due to a flash phenomenon that occurs when slag is discharged out of the system. However, this problem is solved by the temperature control of this embodiment.
In this embodiment, the amount of circulating water flowing through the circulation channel 7 can be always set to a certain minimum required amount, and the water temperature in the water tank 4 is kept at a set temperature of 30 ° C. to 70 ° C. Then, the slag can be granulated into particles having a relatively small particle size.

  The control of the circulating water temperature of the present embodiment and the control of the circulating water flow rate of the embodiments 2 and 3 may be combined and controlled simultaneously. May be. Moreover, in Examples 1-4 of the pressurization type coal gasification furnace mentioned above, although the slag hopper water exit thermometer T1 is provided in the circulation flow path 7, the slag hopper water exit thermometer T1 is provided in the water tank 4 of the gasification furnace 3. May be provided.

As described above, the pressurized coal gasification furnace according to the present embodiment is a system that cools slag hopper water (water in the water tank 4) and circulates slag water in order to maintain the required water level of the slag hopper water. It is comprised by the circulation pump 9, the cooler 8, each control valve (CV1-CV4), the filter apparatus 10, etc. Further, an on-line washable filter 10a such as an automatic washing filter is installed in the slag water circulation system.
Further, the specifications of the cooler 8 and the circulation pump 9 are determined so that the slag hopper water outlet temperature is about 70 ° C. or less, and the circulation pump 9 circulates water. Although the slag hopper water outlet temperature varies depending on the amount of slag, the circulation pump 9 sets the flow rate appropriately. The water level of the slag hopper water (water tank 4) is adjusted by the amount of makeup water and the amount of blowout outside the system by the water level control valves (CV2, CV3).

  Further, in order to reduce wear of the pump and the like and filter load, the circulation flow rate is reduced when the heat load due to the slag is small. That is, the slag hopper water outlet temperature is controlled to be constant by the circulating water flow rate control valve CV1. When the heat input from the gasification furnace is low and the slag hopper water outlet temperature does not reach about 70 ° C., the circulating water flow rate decreases, but the circulating water flow meter F1 prevents the pump from overheating, prevents foreign matter from accumulating in the piping, In order to reliably detect the slag water temperature in the gasification furnace with the slag hopper water outlet thermometer T1, an operation for ensuring a minimum flow amount or more is performed. The water level of the slag hopper water (water tank 4) is adjusted by the amount of makeup water and the amount of blowout outside the system by the water level control valves (CV2, CV3).

The pressurized coal gasifier according to the present embodiment does not require a large-capacity high-lift pump for feeding slag water containing slag, and the amount of slag water discharged from the high-pressure gasifier to atmospheric pressure is low. Since the number of pipes and pumps is inherently less likely to wear out, maintenance costs for pumps and pipes are reduced, spare parts costs are reduced and the risk of pipe replacement is reduced, and high-pressure pumps are used as low-pump circulation pumps. Thus, there are effects such as reduction of motor capacity and reduction of auxiliary machine power.
The temperature adjusting means of the second, third, and fourth embodiments are most effective when installed in the closed circulation channel shown in FIG. 1, but the open circuit circulation channel shown in FIG. Even in that case, a certain degree of effect can be expected.
Further, in place of the filter device 10 shown in FIGS. 1 to 4, as shown in FIG. 6, a general backwash filter 10A and its inlet valve 10B and outlet valve 10C are provided in parallel. The series combination, the inlet valve 10B and the outlet valve 10C are closed, and the backwash water inlet valve 10D and the backwash water outlet valve 10E are opened to supply backwash water to the outlet side of the filter device 10, and the filter You may employ | adopt what wash | cleans the backwashing filter 10A of the apparatus 10, and drains and removes dust.

Based on FIG. 5, the Example of the coal gasification combined cycle power generation equipment which concerns on this invention is described.
A present Example is the coal gasification combined cycle power generation equipment 1 which produces electric power using any of the pressurization type coal gasification furnace (Examples 1-4) mentioned above.

  The combined coal gasification combined power generation facility 1 includes a heat exchanger 17 provided in a gas discharge passage 16 of the pressurized coal gasification furnace 2 and a gas in the gas discharged from the gas discharge passage 16 through a pipe e. A dust removal device comprising a cyclone filter 18 and a porous filter 19 for removing dust, a gas turbine 22 driven by pressurized gas supplied from the dust removal device through a gas purification facility 20 and a combustor 21, and a gas turbine 22 The exhaust heat recovery boiler 26 performs exhaust heat recovery of exhaust gas supplied through the exhaust gas pipe k after driving. Furthermore, the steam turbine driven by the generated steam supplied from the heat exchanger 17 provided in the pressurized coal gasification furnace 2 via the pipe f and the generated steam supplied from the exhaust heat recovery boiler 26 via the pipe i. 24 and a generator 25 that generates electric power by the driving force of the gas turbine 22 and the steam turbine 24.

The gas after driving the gas turbine 22 is discharged from the chimney 27 through the exhaust heat recovery boiler 26. In the figure, g is a water supply pipe to the heat exchanger 17, h is a water supply pipe to the exhaust heat recovery boiler 26, and j is an air supply duct to the compressor 23.
Thus, the combined coal gasification combined power generation facility 1 collects the dust (char) in the slag gas generated by the pressurized coal gasification furnace 2 with the dust removing device (18, 19), and then uses the gas to gas. The turbine 22 is rotated to generate power, and the steam turbine 24 is rotated by generated steam from the heat exchanger 17 provided in the pressurized coal gasification furnace 2 to generate power.

The combined coal gasification combined power generation facility 1 can efficiently and effectively utilize the gas energy generated by the pressurized coal gasification furnace 2, and can stably generate power over a long period of time. In comparison, the maintenance period can be extended.
In the above embodiment, the steam from the pipe f may be first introduced into the exhaust heat recovery boiler 26 and heated, and then supplied to the steam turbine 24.

The present invention can also be applied to the flue gas desulfurization type IGCC filed in Japanese Patent Application No. 2004-188888 filed earlier by the applicant of the present application. Gas purification is not performed in the previous stage, and desulfurization processing is performed in the subsequent stage of the gas turbine 22.
Further, the present invention is not limited to the above-described embodiments, and can be appropriately modified as necessary. In addition, each component in the embodiment includes those that can be easily assumed by those skilled in the art and those that are substantially the same.

It is a circulation flow path figure of the water tank of the pressurization type coal gasification furnace concerning Example 1 of the present invention. It is a circulation flow path figure of the water tank of the pressurization type coal gasification furnace concerning Example 2 of the present invention. It is a circulation flow path figure of the water tank of the pressurization type coal gasification furnace concerning Example 3 of the present invention. It is a circulation flow path figure of the water tank of the pressurization type coal gasification furnace concerning Example 4 of the present invention. It is a systematic diagram which shows the coal gasification combined cycle power generation equipment which concerns on this invention. It is a flow path figure showing other examples of a filter device concerning Examples 1 thru / or 4 of the present invention. It is a circulation flow path figure of the water tank of the pressurization type coal gasifier which the applicant has proposed previously.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coal gasification combined cycle power generation facility 2 Pressurization type coal gasification furnace 3 Gasification furnace 4 Water tank 5 Water supply pipe 6 Drain pipe 7 Circulation flow path 8 Cooler 9 Circulation pump 10 Filter apparatus 16 Gas discharge flow path 17 Heat exchanger 18 Cyclone Filter (dust remover)
19 Porous filter (dust remover)
22 Gas turbine 24 Steam turbine 25 Generator T1 Slag hopper water outlet thermometer (water temperature detection device)
CV1 Circulating water flow control valve

Claims (6)

A gasification furnace that heat-treats the coal raw material under pressure and gasifies the combustible component of the coal raw material to generate gas;
A gas discharge passage provided at an upper portion of the gasification furnace and guiding the gas generated in the gasification furnace to a heat exchanger;
A water tank that is provided at the bottom of the gasification furnace and that granulates slag that is the ash content of the coal raw material;
A slag discharge valve for discharging slag that settles at the bottom of the water tank to the outside of the system;
The other ends of the water supply pipe and the drain pipe provided in the water tank are communicated with each other , do not have an atmospheric pressure open end, and a closed system circulation flow path in which a pipe flow path communicates in series.
A circulating water cooler and a circulation pump provided in the circulation channel;
Pressurized type coal gasifier, characterized in that it comprises a. A water temperature detection device is provided in the water tank or the circulation channel, and temperature adjusting means for adjusting the water temperature in the water tank to 30 ° C. to 70 ° C. is controlled by a temperature signal from the water temperature detection device. The pressurized coal gasifier according to claim 1.   The pressurized coal gasification furnace according to claim 2, wherein a circulating water flow rate control valve is provided in the circulation channel, and the circulating water flow rate control valve is controlled to open and close by a temperature signal from the water temperature detection device. .   The pressurized coal gasification furnace according to claim 2, wherein the discharge capacity of the circulation pump is controlled to increase or decrease by a temperature signal from the water temperature detection device.   The pressurized coal gasification furnace according to claim 2, wherein the refrigerant flow rate of the cooler is controlled to increase or decrease by a temperature signal from the water temperature detection device. A pressurized coal gasifier according to any one of claims 1 to 5, a heat exchanger provided in a gas discharge passage of the pressurized coal gasifier, and a dust removing device that removes dust in the gas. And a gas turbine driven by the gas from the dust removing device, a waste heat recovery boiler that generates steam by the exhaust gas of the gas turbine, and a steam generated from the heat exchanger and the exhaust heat recovery boiler A coal gasification combined power generation facility comprising a steam turbine and generating electric power by a driving force of the gas turbine and the steam turbine.

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