JP2005273456A - Gasification power plant and wood biomass gas producing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasification power plant improvable in heightening calorie of gasification gas and gas conversion efficiency more than ever. <P>SOLUTION: The gasification power plant provided with gas engine power generators 6, 7 and an absorption refrigerator 20 is basically constituted such that a line 5 of gasification gas produced from a fluidized bed gasifying furnace 1 using wood biomass as a raw material is connected to the gas engine power generators 6, 7 using the gasification gas as fuel and that the absorption refrigerator 20 is provided using high temperature cooling water of a return line 19 out of a cooling water line provided in the gas engine 6 of the gas engine power generators 6, 7, as a high temperature heat source. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gasification power plant and a woody biomass gas production system, and in particular, effectively uses steam generated in a gas engine by a pyrolysis reaction using woody biomass as a raw material, and uses a high-temperature heat source of engine cooling water. The present invention relates to a gasification power plant and a woody biomass gas production system that can extract cold heat.

  2. Description of the Related Art Conventionally, in a gas engine power generator, exhaust heat is generally used in a form in which a hot water heater is provided in an exhaust line and hot water is supplied.

  Now, in a gasification furnace (non-patent document 1 described later), a pyrolysis product gas is generated by pyrolysis of a raw material such as woody biomass, and steam is supplied to the gas from the residual tar content in the pyrolysis product gas. Carbon monoxide and hydrogen gas are produced. That is, steam supply is indispensable in a gasification furnace.

URL: http://www.jbnacla.net/h/P2-1.htm, “Biomass White Paper 2003”, JBN (Japan Brazil Network), ACLA (Latin American Academy of Culture / Academia de Cultura Latino) -Americana), BIN (Biomass Industrial Society Network)

  As described above, conventionally, high-temperature exhaust gas in a gas engine power generation apparatus has been used for supplying hot water by installing a water heater, but there is no use example in which steam is generated and supplied to a gasifier.

  In the gas engine power generator, the return high-temperature cooling water of the engine cooling water has a temperature of 100 ° C. or lower. Since this temperature is too low as a high temperature side heat source of a normal absorption refrigerator, it cannot be used for an absorption refrigerator.

  However, a part of the inventor of the present application has completed an epoch-making technology that realizes an absorption refrigerator capable of generating cold under freezing and lowering the temperature of the heat source (name of the invention “operation for absorption refrigerators”). Medium, absorption refrigerator, and cold / hot medium manufacturing method ". Japanese Patent Application 2003-91384 (unpublished). That is, the absorption refrigerator has lithium bromide-water-1 having characteristics significantly different from the vapor pressure characteristics, solubility, and refrigerant vapor pressure of lithium bromide-water-based working media generally used conventionally. , 4-dioxane-based working medium, and in a single-effect absorption refrigerator, it is possible to reduce the size and cost of the equipment, to cool air, to generate cold heat below freezing point, and to lower the heat source temperature. ) To (XV) are the main points.

(I) The refrigerant is water and the absorption liquid is a system having a lithium compound as a first component, or in addition to this, at least one of an alkali metal or alkaline earth metal compound is used as the second component or later. A working medium for an absorption refrigeration machine comprising a containing system, wherein an organic substance exhibiting an azeotropic phenomenon with water is added to the refrigerant system. .
(II) The operation for an absorption refrigerator according to (I), wherein the organic substance has a function of subdividing its cluster structure with respect to water and promoting the formation of five-membered structure water. Medium.
(III) The working medium for an absorption refrigerator according to (II), wherein the organic substance is 1,4-dioxane.
(IV) The working medium for an absorption refrigerator according to any one of (I) to (III), wherein the lithium compound is a lithium halide.
(V) The working medium for an absorption refrigerator according to (IV), wherein the lithium halide is lithium bromide, that is, forms a lithium bromide-water working medium.
(VI) The amount of 1,4-dioxane added is 0.90 to 0.97 in terms of the molar fraction of water as the first component, and any one of (III) to (V) The working medium for absorption refrigerators of description.
(VII) 1,4-dioxane addition amount is 0.93 to 0.95 in terms of molar fraction with water as the first component, the operation for an absorption refrigerator according to (VI) Medium.

(VIII) Absorbent liquid concentrator (hereinafter simply referred to as “concentrator”) including a generator and a condenser, and an absorbent diluter (hereinafter simply referred to as “dilution”) including an evaporator and an absorber. A thick absorption liquid in which the absorption liquid is concentrated by heating the absorption liquid in the generator to evaporate the refrigerant, and cooling the evaporated refrigerant vapor in the condenser. The refrigerant liquid is heated, and the high-temperature concentrated absorbent is heat-exchanged with a low-temperature diluted absorbent described below, and then introduced into the absorber, and the refrigerant liquid is introduced into the evaporator, and the concentrated absorbent is absorbed. The refrigerant liquid of the evaporator is evaporated by cooling with a vacuum vessel, and the generated refrigerant vapor is absorbed by the concentrated absorbent in the absorber, and the diluted absorbent diluted thereby is absorbed by means such as a solution pump. Pull out from the absorber, and concentrate the hot After the temperature is lowered by exchanging heat with the liquid, it is introduced into the generator, while a heat medium (hereinafter, also referred to as “cold water”) cooled by the latent heat of vaporization of the refrigerant in the evaporator is supplied to the cooling customer. The cold water heated up earlier is an absorption refrigerator that cools the customer by cooling again with the evaporator, and the absorption refrigerator uses a standard cold water tower (cooling tower outlet temperature 31 ° C.). That can generate cold water having a standard specification temperature (7 ° C.), and that the temperature difference between the cooling water outlet in the heat exchanger of the absorber and the temperature of the absorbing liquid at the absorber outlet is 5K or more. An absorption refrigerator using the working medium according to any one of (I) to (VII).

(IX) In a diluter in which the evaporator and the absorber are separately provided, the distiller passes through a splash entrainment prevention device provided in the evaporator in order to prevent entrainment of the splash on the generated refrigerant vapor. The absorption refrigerator according to (VIII), characterized in that the flow rate of the refrigerant vapor can be reduced, whereby the splash entrainment prevention device can be simplified or miniaturized.

(X) The cooling means of the absorber is an air cooling means made by air at an atmospheric temperature without using cooling water cooled by a cold water tower, described in (VIII) or (IX) Absorption refrigerator.
(XI) The cooling means of the condenser is an air cooling means made by air at an atmospheric temperature without using cooling water cooled by a cooling water tower, and any one of (XIII) to (X) Absorption refrigerator according to crab.

(XII) Any one of (VIII) to (XI), wherein the heating heat source temperature for the concentration of the absorbent in the generator is 90 ° C. or less without increasing the heat transfer area of the generator Absorption refrigerator according to crab.
(XIII) The absorption refrigerating machine according to (XII), wherein the heating heat source temperature is 85 ° C. or lower.
(XIV) The absorption refrigerator according to (XIII), wherein the heating heat source temperature is 70 ° C or higher and 80 ° C or lower.
(XV) A single-effect absorption refrigerator in which the absorption liquid is concentrated in one stage, and without increasing the heat transfer area of the generator, the condenser, the absorber, and the generator, the temperature below the freezing point The absorption refrigerating machine according to any one of (XII) to (XIV), which is capable of generating cold water.

  According to the invention of the absorption refrigerator, it can be used as a high-temperature side heat source of the absorption refrigerator even at a temperature of 100 ° or less.

  Accordingly, an object of the present invention is to first provide a gasification power plant capable of solving the above-mentioned drawbacks of the prior art and increasing the calorific value of gasification gas and the gas conversion efficiency more than before. .

  Furthermore, the subject of this invention is providing the gasification power generation plant which can utilize the characteristic of the said unpublished invention, can utilize low-temperature waste heat effectively, and can supply the cold heat below freezing point.

  In addition, the object of the present invention is to solve the drawbacks of the above prior art, and to improve the calorieization and gas conversion efficiency of the gasification gas more than before, or use the characteristics of the above undisclosed invention together It is another object of the present invention to provide a woody biomass gas production system that can effectively use low-temperature exhaust heat and supply cold heat below the freezing point.

  As a result of earnestly examining the above problems, the present inventor has led each of the problems by introducing the steam generated in the gas engine to the fluidized bed gasification furnace and using the high temperature cooling water in the cooling water return line as the high temperature heat source of the absorption refrigerator. The inventors have found that this can be solved, and have reached the present invention. That is, the invention claimed or at least disclosed in the present application is as follows.

(1) A gasification power plant comprising a gas engine power generation device and an absorption refrigerator, wherein the plant has a gasification gas line generated from a fluidized bed gasification furnace using woody biomass as a raw material. An absorption refrigerator that is connected to a gas engine power generation device that uses gasified gas as fuel, and that uses high-temperature cooling water in the return line as a high-temperature heat source among the cooling water lines provided in the gas engine of the gas engine power generation device. A gasification power plant, wherein the absorption refrigerator is capable of supplying cold heat below freezing point.
(2) A boiler is provided in the exhaust line for releasing the exhaust of the gas engine to the atmosphere, and the boiler is provided with a steam line for guiding the steam generated here to the fluidized bed gasifier, With such a configuration, the fluidized bed gasification furnace is characterized in that steam can be used as a fluid gas for the thermal decomposition reaction of woody biomass, and a gasification gas such as hydrogen or carbon monoxide can be generated. The gasification power plant as described in 1).

(3) In order to maintain the flow rate of steam generated in the boiler at a value within a certain range required from the supply amount of wood chips in the fluidized bed gasification furnace, the exhaust line of the gas engine is exhausted to the atmosphere. The gasification power plant according to (2), wherein an air discharge line for discharging air is provided.
(4) An exhaust gas flow rate control valve is provided in the exhaust line of the gas engine in order to maintain the temperature of the steam generated in the boiler in a certain range, (2) or (3 ) Gasification power plant as described in).
(5) When the woody biomass undergoes a thermal decomposition reaction with the steam generated in the boiler in the fluidized bed gasification furnace, the ratio of the supply amount of the woody biomass and the steam flow rate is maintained in a desirable range. The gasification power plant according to (2) or (3), wherein a steam flow control valve is provided in the steam line.
(6) When the woody biomass undergoes a thermal decomposition reaction with the steam generated in the boiler in the fluidized bed gasifier, the ratio of the supply amount of the woody biomass and the steam flow rate is maintained in a desirable range. The gasification power plant according to (4), wherein a steam flow control valve is provided in the steam line.

(7) Among the cooling water lines of the gas engine, a cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high temperature cooling water in the return line within a certain range. 1) The gasification power plant in any one of (3).
(8) Among the cooling water lines of the gas engine, a cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high temperature cooling water in the return line within a certain range. The gasification power plant as described in 4).
(9) Among the cooling water lines of the gas engine, in order to maintain the temperature of the high-temperature cooling water in the return line within a certain range, a cooling water flow rate control valve is provided in the supply line. The gasification power plant as described in 5).
(10) Among the cooling water lines of the gas engine, a cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high-temperature cooling water in the return line in a certain range. The gasification power plant as described in 6).

(11) A woody biomass gas production system comprising a fluidized bed gasifier using woody biomass as a raw material, and a steam generator connected to the fluidized bed gasifier with a line, the steam The wood biomass gas production system, wherein the generator is a boiler provided on an exhaust line of a high-temperature exhaust gas source.
(12) In the boiler,
(12A) The exhaust gas from the high-temperature exhaust gas generation source can be discharged to the atmosphere to maintain the flow rate of steam generated in the boiler within a certain range of values required from the supply amount of wood chips in the fluidized bed gasification furnace Na breezing line,
(12B) An exhaust gas flow rate control valve capable of adjusting the exhaust gas flow rate from the high-temperature exhaust gas generation source for maintaining the temperature of steam generated in the boiler in a certain range, or
(12C) a steam flow control valve for maintaining the ratio between the supply amount of woody biomass and the steam flow rate within a desirable range;
At least any one of these is attached, The woody biomass gas manufacturing system as described in (11) characterized by the above-mentioned.

  That is, the present invention uses the gas generated by using the steam generated in the exhaust line of the gas engine as the fluidized gas in the fluidized bed gasification furnace as the fuel for the gas engine power generator, and cools the return line of the gas engine at a high temperature. The above problems are solved by providing a gasification power plant that supplies cold heat below the freezing point with an absorption refrigerator using water as a heat source.

Since the gasification power plant of the present invention is configured as described above, the following effects can be obtained.
1. Since the steam generated in the exhaust line of the gas engine is used as the fluidized gas in the fluidized bed gasifier, it is possible to produce gasified fuel with high calorie and high gas conversion efficiency and supply it to the gas engine.
2. Further, the heat source of the return line of the gas engine cooling water can be used as the heat source of the absorption refrigerator, and cold heat below the freezing point can be taken out.

  Further, according to the woody biomass gas production system of the present invention, the steam generated in the steam generator provided on the exhaust line of the high-temperature exhaust gas generation source is used as the fluid gas in the fluidized bed gasifier, so that the Gasified gas fuel with high gas conversion efficiency can be produced.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a basic configuration of a gasification power plant of the present invention. In the figure, this plant is a gasification power generation plant including gas engine power generation devices 6 and 7 and an absorption refrigerator 20, which is generated from a fluidized bed gasification furnace 1 using woody biomass as a raw material. A gasified gas line 5 is connected to gas engine power generators 6 and 7 using the gasified gas as fuel, and the gas engine power generators 6 and 7 have a cooling water line provided in the gas engine 6. The basic configuration is that an absorption refrigerator 20 using the high-temperature cooling water in the return line 19 as a high-temperature heat source is provided (the invention of (1) above).

  Here, the absorption refrigerator 20 is based on the invention according to the above-mentioned unpublished patent application, and is common in the present invention described below.

  With this configuration, the gasification power plant generates gasification gas using woody biomass as a raw material in the fluidized bed gasification furnace 1, and the gasification gas is fueled by the line 5 through which the gasification gas is conveyed. It is transported to the power generators 6 and 7 and consumed as fuel for driving the gas engine 6, thereby generating power in the power generator 7.

  On the other hand, among the cooling water lines provided in the gas engine 6, the high-temperature cooling water in the return line 19 is used as a high-temperature heat source for the absorption chiller 20, and the absorption chiller 20 generates cold heat below the freezing point. Supplied.

  In the figure, the present plant is provided with a boiler 9 in an exhaust line 8 for releasing the exhaust of the gas engine 6 to the atmosphere, and the steam generated here is guided to the fluidized bed gasifier 1. It can be set as the structure provided with the steam line 11 (invention of said (2)).

  With this configuration, the fluidized bed gasification furnace 1 can use the steam conveyed from the boiler 9 as a fluidized gas for the pyrolysis reaction of woody biomass, and gasified gas such as hydrogen or carbon monoxide. Is generated.

  In the figure, the gasification power plant also maintains the steam flow rate generated in the boiler 9 within a certain range of values required from the amount of wood chips supplied from the chip storage tank 2 in the fluidized bed gasification furnace 1. Therefore, the exhaust line 8 of the gas engine 6 may be provided with an air discharge line 13 for discharging the exhaust gas to the atmosphere (the invention of (3) above).

  With this configuration, the present plant suppresses the flow rate in order to maintain the steam flow rate at a value within a certain range required from the amount of wood chips supplied from the chip storage tank 2 in the fluidized bed gasification furnace 1. When it is necessary to operate, the air discharge line 13 is made to function, and the exhaust gas from the gas engine 6 conveyed through the exhaust line 8 is discharged to the atmosphere. The steam flow rate can be controlled by controlling the degree of exhaust gas discharge from the discharge line 13.

  In the drawing, the present plant may be configured such that an exhaust gas flow rate control valve 14 is provided in the exhaust line 8 of the gas engine 6 in order to maintain the temperature of the steam generated in the boiler 9 within a certain range. Yes (invention (4) above).

  With this configuration, in the present plant, by controlling the exhaust gas flow rate by the exhaust gas flow rate control valve 14, if it is desired to lower the temperature of the steam being conveyed, the amount of air discharge is increased to reduce the flow in the exhaust discharge (10) direction, On the other hand, when it is desired to suppress the decrease in the steam temperature, the flow in the exhaust discharge (10) direction can be sufficiently maintained by reducing the air discharge amount.

  In the figure, this plant also shows that wood biomass supplied from the chip storage tank 2 via the chip supply line 3 when the wood biomass undergoes a thermal decomposition reaction with the steam generated in the boiler 9 in the fluidized bed gasification furnace 1. The steam line 11 may be provided with a steam flow control valve 12 so that the ratio between the supply amount of the steam and the steam flow rate from the boiler 9 is maintained within a desirable range (the above (5) ), (6) invention).

  With this configuration, in the present plant, when it is desired to reduce the amount of steam with respect to the amount of woody biomass supplied by controlling the amount of steam flow through the steam flow control valve 12, the amount of steam supplied to the gasifier 1 is reduced. On the contrary, if it is desired to increase, the supply amount can be increased. Thereby, optimization of the balance of woody biomass supply amount and steam supply amount can be aimed at.

  In the figure, the gasification power plant includes a cooling water flow rate control valve in the supply line 17 in order to maintain the temperature of the high temperature cooling water in the return line 19 among the cooling water lines 17 and 19 of the gas engine 6 within a certain range. 18 is provided (the inventions of (7), (8), (9), (10) above).

  With this configuration, in the present plant, the amount of cooling water is required when a temperature increase is required to maintain the temperature range of the high-temperature cooling water in the line 19 due to the amount of circulating water flowing to the gas engine 6 by the cooling water amount control valve 18. In contrast, if the temperature must be lowered, this can be increased. Thereby, the temperature of the high-temperature cooling water in the return line 19 can be maintained within a certain range.

Now, the gasification power plant of each invention according to the present invention described above will be described again comprehensively.
FIG. 1 shows the overall configuration of the gasification power plant of the present invention. In the figure, the wood chips stored in the chip storage tank 2 are supplied to the fluidized bed gasification furnace 1 through the chip supply line 3, while the air used for the thermal decomposition reaction of the chips flows through the air line 4. The gas is supplied to the bed gasifier 1, and further, steam is supplied through the steam line 11, and is supplied to the pyrolysis reaction of the chip in the same manner as air. Gas generation including combustible gas such as carbon oxide and methane is performed, and this generated gas is supplied to the gas engine 6 through the generated gas line 5 as fuel.

  The gas engine 6 is coupled with a generator 7 to form a gas engine power generator (6, 7). The gas engine 6 drives the generator 7 to generate electricity.

  The exhaust gas burned in the gas engine 6 passes through the exhaust gas line 8 and passes through a steam generator (boiler) 9 located downstream thereof to generate steam in the steam generator 9. Through to the atmosphere.

  The steam generated by the steam generator 9 is supplied to the fluidized bed gasifier 1 through the steam line 11. This steam line 11 is provided with a steam flow control valve 12, and the amount of steam supplied to the fluidized bed gasifier 1 is controlled within a certain range required from the amount of wood chips supplied from the chip storage tank 2. The

  Further, an air discharge line 13 is connected in the middle of the exhaust line 8 of the gas engine 6, and an exhaust gas flow rate control valve 14 is provided in the air discharge line 13. By this valve, the temperature of the steam supplied to the fluidized bed gasification furnace 1 is controlled within a predetermined range.

  In order to cool the gas engine 6, a gas engine cooling line 15 is provided. Among these, a supply water pump 16 is installed in the supply line 17, and cooling water is supplied to the gas engine 6 to supply the gas engine 6. The high-temperature cooling water that has been cooled and cooled to high temperature is returned to the absorption refrigerator 20 through the return line 19, and this high-temperature cooling water is a high-temperature heat source for creating the cold 21 in the absorption refrigerator 20. Supplied as

  Here, a cooling water flow rate control valve 18 is provided on the supply line 17, and the temperature of the high-temperature cooling water in the return line 19 is controlled within a certain required range.

  FIG. 2 is a block diagram showing the basic configuration of the woody biomass gas production system of the present invention. In the figure, the present system 100 includes a fluidized bed gasification furnace 50 using woody biomass as a raw material, and a steam generator 90 connected to the fluidized bed gasification furnace 50 via a line 110. The generator 90 is mainly configured to be a boiler that is connected to the exhaust line 80 of the high-temperature exhaust gas generation source 60 (the invention of (11) above). The system 100 does not need to include the high-temperature exhaust gas generation source 60 itself as a component, but may include this.

  With this configuration, in the present system 100, steam is generated in the boiler as the steam generator 90 by the high-temperature exhaust gas generated in the high-temperature exhaust gas generation source 60 such as a gas engine and conveyed by the exhaust line 80, and this is generated in the line. 110 is supplied to the fluidized bed gasification furnace 50 to produce woody biomass gas using woody biomass as a raw material.

In the figure, the present system 100 includes the boiler 90,
(A) The exhaust gas from the high-temperature exhaust gas generation source 60 can be discharged to the atmosphere to maintain the generated steam flow rate within a certain range required from the supply amount of wood chips in the fluidized bed gasification furnace 50. Nara, wind line 130,
(B) An exhaust gas flow rate control valve 140 capable of adjusting the exhaust gas flow rate from the high temperature exhaust gas generation source 60 for maintaining the temperature of the steam generated in the boiler 90 in a certain range,
(C) a steam flow control valve 120 for maintaining the ratio between the supply amount of woody biomass and the steam flow rate within a desired range;
At least one of the above may be attached (the invention of (12) above).

  By attaching these, the intended steam supply amount control and steam temperature control are performed.

  Since the gasification power plant of the present invention is configured as described above, the steam generated in the exhaust line of the gas engine can be used as the fluidized gas in the fluidized bed gasification furnace, and the gasification gas has high calorie and high gas conversion efficiency. Fuel can be generated and supplied to the gas engine. Moreover, the heat source of the return line of the gas engine cooling water is used as the heat source of the absorption refrigerator, and the cold heat below the freezing point can be taken out.

  Further, according to the woody biomass gas production system of the present invention, the steam generated in the steam generator provided on the exhaust line of the high-temperature exhaust gas generation source can be used as the fluidized gas in the fluidized bed gasifier, so the Gasified gas fuel with high gas conversion efficiency can be generated, and its industrial utility value is high.

It is a block diagram which shows the basic composition of the gasification power plant of this invention. It is a block diagram which shows the basic composition of the woody biomass gas manufacturing system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fluidized bed gasifier 2 ... Chip storage tank 3 ... Chip supply line 4 ... Air line 5 ... Generated gas line 6 ... Gas engine 7 ... Generator 8 ... Exhaust gas line 9 ... Steam generator (boiler)
DESCRIPTION OF SYMBOLS 10 ... Exhaust discharge line 11 ... Steam line 12 ... Steam flow control valve 13 ... Exhaust air discharge line 14 ... Exhaust flow control valve 15 ... Cooling water line 16 ... Feed water pump 17 ... Supply line 18 ... Cooling water flow control valve 19 ... Return Line 20 ... Absorption refrigerator 21 ... Cold heat

DESCRIPTION OF SYMBOLS 50 ... Fluidized bed gasifier 60 ... High temperature exhaust gas generation source 80 ... Exhaust line 90 ... Steam generator 100 ... Woody biomass gas production system 110 ... Line 120 ... Steam flow control valve 130 ... Air discharge line 140 ... Exhaust gas flow control valve

Claims (12)

A gasification power plant comprising a gas engine power generation device and an absorption chiller, wherein the plant has a gasification gas line generated from a fluidized bed gasification furnace using woody biomass as a raw material. And an absorption refrigerator that uses high-temperature cooling water in the return line as a high-temperature heat source among cooling water lines provided in the gas engine of the gas engine power-generation device. A gasification power plant characterized in that the absorption refrigerator is capable of supplying cold heat below the freezing point. The exhaust line for releasing the exhaust of the gas engine to the atmosphere is provided with a boiler, and the boiler is provided with a steam line for guiding the steam generated here to the fluidized bed gasification furnace. In the fluidized bed gasification furnace, steam can be used as a fluidized gas for the pyrolysis reaction of woody biomass, and a gasified gas such as hydrogen or carbon monoxide can be generated. The gasification power plant described. In order to maintain the flow rate of steam generated in the boiler at a value within a certain range required from the supply amount of wood chips in the fluidized bed gasification furnace, the exhaust gas of the gas engine is discharged to the atmosphere. A gasification power plant according to claim 2, wherein an air discharge line is provided. The gas according to claim 2 or 3, wherein an exhaust gas flow rate control valve is provided in an exhaust line of the gas engine in order to maintain a temperature of steam generated in the boiler within a certain range. Power plant. In the fluidized bed gasification furnace, when the woody biomass undergoes a thermal decomposition reaction with the steam generated in the boiler, the steam line is maintained in the steam line so that the ratio of the wood biomass supply amount and the steam flow rate is maintained within a desirable range. The gasification power plant according to claim 2 or 3, wherein a steam flow control valve is provided. In the fluidized bed gasification furnace, when the woody biomass undergoes a pyrolysis reaction with the steam generated in the boiler, the steam line is maintained in the steam line so that the ratio of the woody biomass supply amount and the steam flow rate is maintained within a desirable range. The gasification power plant according to claim 4, wherein a steam flow control valve is provided. The cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high temperature cooling water in the return line in the cooling line of the gas engine in a certain range. The gasification power plant in any one of 3. The cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high temperature cooling water in the return line in the cooling water line of the gas engine in a certain range. The gasification power plant described. The cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high-temperature cooling water in the return line within a certain range among the cooling water lines of the gas engine. The gasification power plant described. The cooling water flow rate control valve is provided in the supply line in order to maintain the temperature of the high temperature cooling water in the return line in the cooling water line of the gas engine in a certain range. The gasification power plant described. A woody biomass gas production system comprising a fluidized bed gasifier using woody biomass as a raw material, and a steam generator connected to the fluidized bed gasifier in a line, the steam generator comprising: A woody biomass gas production system, which is a boiler provided on an exhaust line of a high-temperature exhaust gas generation source. In the boiler,
(12A) The exhaust gas from the high-temperature exhaust gas generation source can be discharged to the atmosphere to maintain the flow rate of steam generated in the boiler within a certain range of values required from the supply amount of wood chips in the fluidized bed gasification furnace Na breezing line,
(12B) An exhaust gas flow rate control valve capable of adjusting the exhaust gas flow rate from the high-temperature exhaust gas generation source for maintaining the temperature of steam generated in the boiler in a certain range, or
(12C) a steam flow control valve for maintaining the ratio between the supply amount of woody biomass and the steam flow rate within a desirable range;
The woody biomass gas production system according to claim 11, wherein at least one of the above is attached.

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