WO2004087839A1

WO2004087839A1 - Fluidized bed gasifier, gas fuel producing method, and gas power generation system

Info

Publication number: WO2004087839A1
Application number: PCT/JP2004/004475
Authority: WO
Inventors: Takanari Okamura; Chouji Hukuhara
Original assignee: Hachinohe Institute Of Technology
Priority date: 2003-03-28
Filing date: 2004-03-29
Publication date: 2004-10-14
Also published as: JP2004292720A

Abstract

A fluid catalyst of a fluidized bed gasifier (1) has a tar decomposing function and is equipped in a fluid catalyst holding section (6) for generating thermal decomposition produced gas produced by thermally decomposing the raw material. The gasifier is so structured that at a place on the downstream of the fluid catalyst holding section and on the upstream of a produced-fuel-gas discharging section, another catalyst holding section, in another word, a catalyst layer (12) is installed which contains a catalyst having a function of decomposing the remaining tar in the thermal decomposition produced gas. Thus tar production in the produced gas to be used as a gas fuel can be suppressed more than the conventional ones.

Description

Description Fluidized bed gasifier, gas fuel production method, and gas power generation system

The present invention relates to a fluidized-bed gasification furnace, a gas fuel production method, and a gas power generation system, and more particularly to a moving bed gas for effectively suppressing tar generation in a gas generation process using woody biomass as a raw material. The present invention relates to a gasification furnace, a gas fuel production method, and a gas power generation system using the same. Background art

Conventionally, in a fluidized-bed gasification furnace, generally, a method has been adopted in which generated tar is adsorbed on a fluidized catalyst, and the fluidized medium is passed through a combustion furnace to burn and remove the tar. For example, in the “method of decomposing tar in combustible gas” (Reference 1) disclosed in Japanese Patent Application Laid-Open Publication No. H11-216, when waste is gasified in a fluidized-bed gasification furnace, In order to efficiently decompose and remove the tar contained in the generated combustible gas, the generated gas is heated to a predetermined temperature in a heat exchanger, and then brought into contact with the catalyst in the tar reforming tower, and There has been proposed a method of decomposing tars into hydrocarbons and the like.

Further, in “Method and Device for Recycling Organic Waste” (Japanese Unexamined Patent Application Publication No. 10-236801), in the gas generation by incineration of organic waste, Combination of low-temperature gasification and high-temperature gasification, using a fluidized-bed gasifier for low-temperature gasification, a melting furnace for high-temperature gasification, and 450- At 650, the freeboard section gasifies at 600 to 850, and in the melting furnace used for high-temperature gasification, it burns at a high temperature of more than 130 ° C, resulting in higher temperatures and lower temperatures. To gasify oil Has been proposed.

In the “gasification-decomposition apparatus for organic matter” disclosed in JP-A-9-111254 (Reference 3), organic substances such as plastics, heavy oil, and residual oil are partially gasified and sooted. Alternatively, when producing a raw material gas for methanol synthesis containing almost no tar, a gas cracking furnace is installed on the downstream side of the gasification furnace, which contains a nickel-containing alloy or nickel catalyst, A configuration including a supply unit and a supporting gas supply unit has been proposed.

On the other hand, the “gasification furnace” (Reference 4) disclosed in Japanese Patent Application Laid-Open No. 2001-81478 discloses a low cost, safe, and tar-removable property regardless of location. A gasification furnace that pyrolyzes waste into gas to provide a gasification furnace that has Proposals have been made to provide a layer of a catalyst that oxidizes and decomposes. Disclosure of the invention

However, in the conventional gasifiers disclosed in the above References 1 to 3, it is necessary to provide a combustion furnace in addition to the gasifier, which complicates the plant configuration, and requires If it is used, there is a problem that the conversion of biomass to gas is reduced by burning the tar component. In the technology disclosed in Reference 4, although it is not necessary to provide any equipment other than the gasifier, the catalyst layer is provided on the exposed surface inside the gasifier, and the pyrolysis gas reacts with the catalyst layer. Opportunities to carry out are limited, and from the viewpoint of enabling the production of high-quality gas fuel with extremely low tar content, a sufficient tar generation suppression effect cannot be expected.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to use it as a gas fuel. It is an object of the present invention to provide a fluidized-bed gasification furnace and a method for producing gaseous fuel, which can suppress the generation of tar in the generated gas from the conventional method. By suppressing the generation of tar in the generated gas, it is possible to produce a gas fuel with an extremely low tar content, thereby satisfying the fuel specification conditions of the prime mover used in the power generator using the fuel. An object of the present invention is to provide a floor gasifier, a gas fuel production method, and a gas power generation system using the same.

課題 Another object of the present invention is to provide a fluidized bed gas that can reform a portion of the product gas in the gasification furnace to obtain a product gas having a high calorific value. Another object of the present invention is to provide a method for producing a furnace and a gaseous fuel, and to reduce the complexity of the plant structure, reduce the size of the plant, introduce equipment, and reduce the operating cost. An object of the present invention is to provide a fluidized bed gasifier, a gas fuel production method, and a gas power generation system using the same.

As a result of the inventors of the present invention diligently examining the above problems, they have found that the problems can be solved by providing catalyst sections for suppressing the generation of tar components on the upstream side and downstream side of the gasification furnace, respectively. Was. That is, the invention disclosed in the present application is as follows.

(1) Gas fuel production raw material to be supplied (hereinafter, also simply referred to as “raw material”).

) Using a fluidized gas and a fluidized catalyst to produce a gaseous fuel, wherein the fluidized catalyst is a fluidized bed for thermal cracking of a raw material to produce a pyrolysis product gas. A catalyst having a tar cracking function provided in the catalyst holding section, and located downstream of the fluidized catalyst holding section and before a generated fuel gas discharge section (hereinafter, also referred to as a "gasification furnace outlet section"). A catalyst layer as another catalyst holding section is provided on the flow side, and the catalyst layer is provided with a catalyst having a function of decomposing tar remaining in the pyrolysis product gas. To a fluidized bed gasifier. (2) The catalyst provided in the catalyst layer is a reforming catalyst, and steam is supplied to the catalyst layer (hereinafter, such a catalyst layer is particularly referred to as “reforming catalyst layer”) through a steam supply line. Accordingly, in the reforming catalyst layer, it is possible to convert the residual tar content in the pyrolysis product gas flowing into the reforming catalyst layer into carbon monoxide and hydrogen. Floor gasifier.

(3) The fluidized-bed gasification furnace according to (2), wherein the reforming catalyst used in the reforming catalyst layer is a metal-supported honeycomb catalyst.

(4) The fluidized-bed gasification furnace according to (2), wherein the reforming catalyst used in the reforming catalyst layer is a metal-supported alumina honeycomb catalyst.

(5) The catalyst provided in the fluidized catalyst holding section contains at least a metal-supported zeolite catalyst, (1) to (5).

The fluidized bed gasifier according to any one of (4) to (4).

(6) The fluidized bed according to any one of (1) to (5), wherein the catalyst provided in the fluidized catalyst holding section includes at least a nickel-supported zeolite catalyst. Gasifier.

(7) The catalyst provided in the fluidized catalyst holding unit is an aggregate of a plurality of catalysts, and the aggregate of the catalysts has a tar cracking function and a hydrogen generation function. ) The fluidized bed gasifier according to any one of (6) to (6).

(8) The method according to any one of (1) to (7), wherein a cyclone type particle separation unit is provided upstream of the catalyst layer and downstream of the fluidized catalyst holding unit. A fluidized bed gasifier as described.

(9) Separation of particles in the pyrolysis product gas is performed only in the cyclone type particle separation section in the gasification furnace, and decomposition of tar is performed in the fluidized catalyst holding section in the gasification furnace and in the gasification furnace. What happens only in the catalyst layer The fluidized-bed gasifier according to (8), which is characterized in that:

(10) The fluidized bed according to (8) or (9), wherein the fluidized catalyst holding unit is provided with an ash discharge line for discharging ash generated by thermal decomposition of a raw material. Gasifier.

(11) The fluidized-bed gasification furnace according to any one of (8) to (10), wherein an inlet for a raw material is provided upstream of the cyclone-type particle separation section.

(12) A gas fuel production method using a fluidized-bed gasification furnace, wherein the supplied raw material is produced in a fluidized catalyst holding portion of the gasification furnace by a fluidized gas and a fluidized catalyst having a tar cracking function. A first step of generating a pyrolysis gas by pyrolysis while suppressing cracking, and a second step of separating and removing particles in the pyrolysis gas and subjecting the particles to the first step again. A third step of converting the pyrolysis product gas from which particles have been removed from the gas in the porous catalyst layer into carbon monoxide and hydrogen using a steam and reforming catalyst having a tar decomposition function; A gas fuel production method capable of obtaining a gas fuel having a reduced content through the process.

(13) A method for producing a gaseous fuel using the fluidized bed gasifier according to any one of (1) to (11), wherein the fluidized bed gasifier is provided with A first step in which a fluidized catalyst having a function of decomposing a flowing gas and tar in a fluidized catalyst holding section of the gasification furnace is used to thermally decompose and generate a pyrolysis product gas while suppressing the generation of an evening gas; A second step of separating and removing the particles in the decomposition product gas and subjecting the particles to the first step again; and, in the reforming catalyst layer, the pyrolysis product gas from which the particles have been removed has a steam and tar decomposition function. A gas fuel production method capable of obtaining a gas fuel with reduced tar content through a third step of converting residual tar content in gas into carbon monoxide and hydrogen using a reforming catalyst. . (1) A metal-carrying zeolite catalyst is used for the fluidized catalyst holding section in the first step, and a metal-carrying honeycomb catalyst is used for the reforming catalyst layer in the third step. 2) or the gas fuel production method according to (13).

(15) A nickel-supported zeolite catalyst is used in the fluidized catalyst holding section in the first step, and a metal-supported alumina honeycomb catalyst is used in the reforming catalyst layer in the third step. The gas fuel production method described in 1 2) or (1 3).

(16) The gas fuel production method according to any one of (12) to (15), wherein the raw material is biomass such as woody biomass.

(17) A fluidized-bed gasifier according to any one of (1) to (11), and a fluidized-bed gasifier provided through a fluidized gas line and a product gas line. A gas power generation system comprising: a gas power pin serving as a prime mover of a power generation device; and a power generator connected to a port provided in the gas power pin.

(18) The gas bin is composed of a compressor, a combustor, a bin, and a regenerator, and hot water is supplied to the downstream side of the regenerator by utilizing exhaust heat. The gas power generation system according to (17), wherein a water heater for supplying water is provided.

(19) The gas power generation system according to (17) or (18), wherein the raw material used is biomass such as woody biomass. That is, according to the present invention, a metal-supported zeolite fluidized catalyst having a function of decomposing tar is disposed in the first stage located in the fluidized bed portion below the gasification furnace, and the first stage is disposed in the freeboard portion above the gasification furnace. The above problem was solved by providing a gasification furnace in which a two-stage metal-supported 82 cam reforming catalyst layer having the function of converting tar to hydrogen and carbon monoxide by steam reforming was provided. is there. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an explanatory diagram showing the configuration of the fluidized-bed gasification furnace of the present invention.

FIG. 2 is a flowchart showing the configuration of the gas fuel production method of the present invention. FIG. 3 is an explanatory diagram showing the configuration of the gas power generation system of the present invention.

The codes used are as follows.

1 ... gasifier, 2 ... flowing gas line, 3 ... flowing gas inlet, 4-dispersion plate, 5 ... flowing gas jet, 6 ... flowing catalyst holding section, 7 ... raw material supply line, 8 ... raw material supply device, 9 ... cyclone type particle separation part, 10 ... gas passing through the particle separation part, 11 particle flow, 12 ... reforming catalyst layer, 13 ... steam supply line, 14 free board, 15 ... product gas, 16 … Product gas line, 17 ash discharge line, 18… combustor, 19… turbine, 20… regenerator, 21… water heater, 22… exhaust gas, 23… generator, 24… intake Duct, 25… air line, 26… compressor, 27… hot water, 30… gas turbine,

Raw material, 300, pyrolysis gas, 350, removed particles, 400, pyrolysis gas with particles removed, 500, · and evening converted from a Le was CO, gas fuel containing H ₂

丄… Step 、, P 2 第 Step 2, P 3 第 Step 3 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing the configuration of the fluidized-bed gasification furnace of the present invention. In the figure, a fluidized bed gasifier 1 of the present invention is introduced from a upstream side into a fluidized gas introduction part 3 for introducing a fluidized gas from a fluidized gas introduction line 2 and a fluidized gas introduction part 3. Dispersion plate 4 to make the flowing gas The flowing gas jet 5 causes a jet of a flowing catalyst to be generated, and a thermal decomposition reaction of the supplied raw material is performed. The free catalyst 1 is a space downstream of the flowing catalyst holding portion 6. 4. It basically comprises a catalyst layer 12 provided on the downstream side and a generated gas line 16 for transporting the generated gas. In this figure, the fluidized-bed gasifier 1 is used to thermally decompose a supplied gaseous fuel production raw material (hereinafter, also simply referred to as “raw material”) using a fluidized gas and a fluidized catalyst to produce a gaseous fuel. A gasification furnace, wherein the fluidized catalyst is a catalyst having a tar cracking function provided in a fluidized catalyst holding unit 6 for performing pyrolysis of a raw material to generate a pyrolysis product gas; On the downstream side of the section 6 and on the upstream side of the generated fuel gas discharge section (hereinafter also referred to as “gasification furnace outlet section”), a catalyst layer 12 as another catalyst holding section is provided. The main configuration is that the layer 12 is provided with a catalyst having a function of decomposing tar remaining in the pyrolysis product gas.

In the figure, in the fluidized-bed gasification furnace 1, the catalyst provided in the catalyst layer 12 is a reforming catalyst, and the catalyst layer 12 (hereinafter referred to as the “reforming catalyst layer 12” ) Is provided with a steam supply line 13 for supplying steam thereto, so that in the reforming catalyst layer 12, the residual gas contained in the pyrolysis product gas flowing into the reforming catalyst layer 12 flows into the reforming catalyst layer 12. It has a function to convert tar components into carbon monoxide and hydrogen.

In FIG. 1, since the fluidized-bed gasifier of the present invention is configured as described above, the fluidized gas is introduced from the fluidized gas introduction line 2 to the fluidized gas introduction unit 3, and the fluidized gas passes through the dispersion plate 4. As a result, a fluidized gas jet 5 is formed, whereby the catalyst held in the fluidized catalyst holding unit 6 becomes a jet of a fluidized catalyst, while the fluidized catalyst holding unit 6 is supplied with a raw material. In the fluidized catalyst holding section 6, the raw material is thermally decomposed in the presence of the jet of the fluidized catalyst. At this time, the generation of tar components is suppressed by the action of a catalyst having a tar decomposing function. The generated pyrolysis gas passes through the free board 14 and is introduced into the catalyst layer 12 provided on the downstream side, and steam is supplied to the catalyst layer 12 from the steam supply line 13. Then, a conversion reaction is performed in which the tar remaining in the gas is converted into carbon monoxide (CO)) and hydrogen (H 2) by a catalyst having a function of decomposing the tar remaining in the pyrolysis gas. The generated gas thus generated is discharged from the outlet of the gasifier 1 and transported by the generated gas line 16. By this action, the supplied raw material is thermally decomposed by the flowing gas and the flowing catalyst, and gas fuel (product gas) is produced.

In FIG. 1, as the reforming catalyst used for the reforming catalyst layer 12, a metal-supported honeycomb catalyst can be used. It can also be, in particular, a metal-supported alumina honeycomb catalyst.

In the figure, in the fluidized-bed gasification furnace 1, the catalyst provided in the fluidized-catalyst holding section 6 can include at least a metal-supported zeolite catalyst. In particular, at least a nickel-supported zeolite catalyst can be included.

In the figure, in the fluidized-bed gasifier 1, the catalyst provided in the fluidized catalyst holding unit 6 is an aggregate of a plurality of catalysts, and the aggregate of the catalysts has a tar cracking function and hydrogen generation as a whole. Functions can be provided.

In FIG. 1, the fluidized-bed gasification furnace 1 may have a configuration in which a cyclone-type particle separation unit 9 is provided upstream of the catalyst bed 12 and downstream of the fluidized catalyst holding unit 6. it can. As a result, when particles such as catalyst particles are present in the pyrolysis product gas generated on the upstream side, the components of the gas are passed through the cyclone type particle separation section 9 through the particle separation section 1 containing no particles. 0 and the particle flow containing particles 11 are separated, and the flow 10 passing through the particle separation section is After being introduced into the catalyst layer 12 and subjected to the conversion of residual tar, the particle stream 11 moves downward (upstream side) and is again subjected to the thermal decomposition reaction in the fluidized catalyst holding section 6. You. With such a configuration and operation, in the fluidized-bed gasifier 1 of the present invention, there is no need to provide a special cyclone outside the gasifier.

The fluidized bed gasifier 1 of the present invention performs the separation of the particles in the pyrolysis product gas only in the cyclone type particle separation unit 9 in the gasifier 1, and generates one of the particles by the above configuration and operation. The decomposition of the tar content in the gas can be performed only in the fluidized catalyst holding section 6 and the catalyst layer 12 in the gasification furnace 1.

In FIG. 1, the fluidized-bed gasification furnace 1 also includes an ash discharge line 17 for discharging ash generated by thermal decomposition of a raw material in the fluidized catalyst holding section 6, wherein the cyclone type particle separation is performed. The fluid catalyst holding section 6 upstream of the section 9 is provided with a raw material inlet. Thereby, the ash generated by the thermal decomposition of the raw material is discharged by the ash discharge line 17. The raw material is supplied to the fluidized catalyst holding unit 6 from a raw material supply line 7 having a raw material supply device 8.

That is, as shown in FIG. 1 and the above description, in the fluidized-bed gasification furnace 1 of the present invention, the gasification furnace 1 has a flowing gas introduction section 3 at a lower portion (front side), and a lower portion of this portion ( A fluidized gas line 2 is connected to the upstream side (the upstream side), and a dispersion plate 4 is arranged at the upper side (the downstream side). A fluid catalyst holding unit 6 is provided on the upper part (the downstream side) of the dispersion plate 4, and a raw material supply line 7 provided with a raw material supply device 8 is connected to this part. Further, an ash discharge line 17 is connected to the upper part (the downstream side) of the dispersion plate 4. A space above (on the downstream side of) the fluid catalyst holding section 6 is a freeboard 14, and a cyclone type particle separation section 9 is provided above (on the downstream side), followed by a reforming catalyst layer 12. Between the cyclone type particle separation section 9 and the reforming catalyst layer 12, steam The supply line 13 is connected, and the generated gas line 16 is connected to the top of the gasifier 1 (on the downstream side).

Therefore, with this configuration, the flowing gas such as air supplied from the flowing gas line 2 is guided to the flowing gas introduction section 3 of the gasification furnace 1, passes through the dispersion plate 4 and forms the flowing gas jet 5, and the flowing catalyst holding section 6 To form a flowing catalyst, which is jetted. At this time, the raw material is supplied from the raw material supply line 7 into the gasification furnace by the raw material supply device 8 and enters the fluidized catalyst holding unit 6, where the fluidized catalyst having a tar decomposing function such as nickel-supported zeolite is added. It is jetted while mixing. In this part (fluid catalyst holding part 6), the raw material reacts with flowing gas such as air and thermally decomposes, and the exothermic reaction brings the temperature to about 700 X: temperature, carbon dioxide gas (C 02), monoxide It produces carbon (CO), hydrogen (H 2), and methane gas (CH 4), and the production of tar is suppressed by the action of a fluid catalyst.

The gas generated by the thermal decomposition in the fluid catalyst holding unit 6 is guided to the cyclone type particle separation unit 9 to form a swirl flow, and the flow 10 passing through the particle separation unit not containing catalyst particles and the like, and the particles containing particles Stream 11 is separated. The flow 10 passing through the particle separation section is directed to a reforming catalyst layer 12 provided with a reforming catalyst such as a metal-supported alumina honeycomb, while the particle flow 11 flows downward (upstream). For this reason, the catalyst particles and the like are mixed again into the fluidized catalyst holding section 6 in which the fluidized catalyst and the raw material are mixed and jetted, and are subjected to a thermal decomposition reaction of the raw material.

At this time, the ash generated by the thermal decomposition reaction in the fluidized catalyst holding section 6 is discharged out of the furnace from the ash discharge line 17. The pyrolysis gas that exited the cyclone-type particle separation section 9 was directed to the reforming catalyst layer 12, and was provided with steam supplied from a steam supply line 13 while passing through this layer. Due to the catalytic action of the reforming catalyst, the remaining amount of gas remaining in the gas body is reformed. It is converted to carbon monoxide (CO) and hydrogen (H2). The product gas 15 exiting the reforming catalyst layer 12 is led to the product gas line 16 as fuel gas.

FIG. 2 is a flowchart showing the configuration of the gas fuel production method of the present invention. In other words, the outline of the method for producing gaseous fuel using the above-described fluidized-bed gasification furnace can be summarized in the flow of the figure. That is, in this production method, the supplied raw material is supplied to the fluidized catalyst holding section (6) of the gasification furnace (1. The symbols used in FIG. The first step P1 in which thermal decomposition is carried out to generate a pyrolysis product gas while suppressing the formation of tar by a fluidized catalyst having a catalyst, and then the particles in the pyrolysis product gas are separated and removed, and the particles are again removed. In the second step P 2 for the first step, and in the reforming catalyst layer (12), the pyrolysis product gas (10) from which the particles have been removed is converted into steam and a reforming catalyst having a tar decomposition function. And a third process P3 that converts residual tar content in the gas into carbon monoxide and hydrogen using a gas fuel with reduced evening content by going through these processes in order. Can be obtained.

The gas fuel production method shown in FIG. 2 can be performed by using the above-described fluidized bed gasifier 1 according to the present invention.

In the present production method, in the first process P1, in a first step P1, the supplied raw material is tarred by a fluidized gas and a fluidized catalyst having an evening cracking function in a fluidized catalyst holding section (6) of the gasifier (1). Pyrolysis is performed while suppressing generation to generate a pyrolysis product gas. Then, in a second step P 2, particles in the pyrolysis product gas are separated and removed, and the particles are again supplied to the first step. Then, in the third step P 3, the pyrolysis gas (10) from which particles have been removed is converted into gas by the reforming catalyst having steam and tar decomposition functions in the reforming catalyst layer (12). Residual tar content is converted to carbon monoxide and hydrogen. Thus, a gas fuel with reduced tar content is produced. In the manufacturing method shown in the figure, a metal-supported zeolite catalyst can be used for the fluidized catalyst holding part in the first step P 1, and a metal-supported honeycomb catalyst can be used for the reforming catalyst layer in the third step P 3. . In particular, a nickel-supported zeolite catalyst can be used as the fluidized catalyst holding part in the first process P1, and a metal-supported alumina double cam catalyst can be used as the reforming catalyst layer in the third process P3. Further, as the raw material, biomass such as woody biomass can be used.

FIG. 3 is an explanatory diagram showing the configuration of the gas power generation system of the present invention. In the figure, the present system 100 is provided in communication with any of the above-described fluidized-bed gasifiers 1 and the fluidized-bed gasifier 1 via a fluidized gas line 2 and a product gas line 16. And a generator 23 connected to a rotor provided in the gas turbine 30 as a prime mover of the power generation apparatus.

In FIG. 3, in the present gas power generation system 100, the gas bin 30 is composed of a compressor 26 combustor 18, a tarpin 19 and a regenerator 20, and the downstream of the regenerator 20. On the side, a water heater 21 for supplying hot water using waste heat can be provided. Further, a system using biomass such as woody biomass as a raw material can be provided. In the figure, since the gas power generation system 100 of the present invention is configured as described above, air is sucked from the atmosphere through the intake duct 24 in the compressor 26 of the gas bin, and this air is compressed. Then, it is discharged from the compressor 26. A part of the discharged air is sent to the regenerator through the air line 25 between the regenerator 20 and the remaining air is passed through the fluidized gas line 2 to the fluidized bed gasifier 1 Sent to

The product gas 15 generated in the fluidized bed gasifier 1 is a product gas It is supplied as a fuel gas to the combustor 18 of the gas turbine through the line 16, and the high-temperature air sent by the regenerator 20 is burned as an oxidant to generate a high-temperature gas. . This high-temperature gas is guided to the turbine 19 and generates an output by expansion work. This output is converted to an electrical output by rotating the generator 23 with an output obtained by subtracting the driving power of the compressor 26.

The exhaust gas 22 at the outlet of the evening bin 19 is heated through the regenerator 20 to raise the temperature of air, and then the water is heated through the water heater 21 provided on the flow side, Supply hot water 27. The exhaust gas 22 coming out of the water heater 21 is released to the atmosphere. That is, by the above operation, an output for rotating the generator 23 in the gas bin 30 is generated using the generated gas generated in the fluidized bed gasifier 1 constituting the system 100 as a fuel, The generator 23 is operated to generate power.

In addition, part of the compressed air generated by the compressor 26 of the system 100 is supplied as fluidized bed gas to the fluidized bed gasifier 1 constituting the system 100, and is generated by the regenerator 20. Hot air is also in the combustor in system 100

Exhaust gas 22 supplied to the regenerator 20 and passed through the regenerator 20 is supplied to the water heater 2

7 for hot water supply. Industrial applicability

Since the fluidized-bed gasifier, the gas fuel production method, and the gas power generation system using the same according to the present invention are configured as described above, the following effects can be obtained.

1. The fluidized-bed gasifier and the gaseous fuel production method of the present invention make it possible to supply gaseous fuel containing an extremely low percentage of gaseous oil, and reduce the fuel specification conditions of the prime mover used in the power generator. To get a satisfactory fuel Can be.

2. In addition, the cyclone that was conventionally provided at the gasification furnace outlet line is not required, which can contribute to downsizing and cost reduction of the plant.

3. Similarly, tar removal equipment conventionally provided at the gasification furnace outlet line is no longer necessary, which can contribute to downsizing and cost reduction of the plant.

4. In addition, the tar content is decomposed into hydrogen and carbon monoxide in the gasifier, so the calorific value of the generated gas can be increased.

5. A gas power generation system using such a fluidized bed gasifier can be realized.

Claims

The scope of the claims

1. A fluidized-bed gasification furnace for producing a gaseous fuel by pyrolyzing a supplied gaseous fuel production raw material (hereinafter, also simply referred to as a "raw material") using a fluidized gas and a fluidized catalyst. Is a catalyst having a tar cracking function, which is provided in a fluidized catalyst holding section for generating a pyrolysis product gas by performing thermal cracking of the raw material. A catalyst layer, which is another catalyst holding section, is provided upstream of the section (hereinafter, also referred to as “gasification furnace outlet section”), and the catalyst layer is provided with a tar content remaining in the pyrolysis product gas. A fluidized-bed gasifier comprising a catalyst having a function of decomposing.

2. The catalyst provided in the catalyst layer is a reforming catalyst, and steam is supplied to the catalyst layer (hereinafter, such a catalyst layer is particularly referred to as a “reforming catalyst layer”) by a steam supply line. 2. The fluidized bed gas according to item 1, wherein the reforming catalyst layer is capable of converting a residual tar content in the pyrolysis product gas flowing into the reforming catalyst layer into carbon monoxide and hydrogen. Furnace.

3. The fluidized-bed gasification furnace according to 2, wherein the reforming catalyst used in the reforming catalyst layer is a metal-supported honeycomb catalyst.

4. The fluidized-bed gasification furnace according to 2, wherein the reforming catalyst used in the reforming catalyst layer is a metal-supported alumina honeycomb catalyst.

5. The fluidized-bed gasifier according to any one of 1. to 4., wherein the catalyst provided in the fluidized catalyst holding unit includes at least a metal-supported zeolite catalyst.

6. The catalyst provided in the fluidized catalyst holding unit includes at least a nickel-supported zeolite catalyst, which is characterized in that:

5. The fluidized bed gasifier according to any one of the above.

7. The catalyst provided in the fluidized catalyst holding unit is an aggregate of a plurality of catalysts, and the aggregate of the catalysts has a tar cracking function and a hydrogen generation function. 6. The fluidized-bed gasifier according to any one of to 6.

8. The flow according to any one of 1 to 7, wherein a cyclone-type particle separation unit is provided upstream of the catalyst layer and downstream of the fluidized catalyst holding unit. Floor gasification.

9. Separation of the particles in the pyrolysis product gas is performed only in the cyclone-type particle separation section in the gasification furnace, and decomposition of tar is performed in the fluidized catalyst holding section and the catalyst in the gasification furnace. 8. The fluidized bed gasifier according to item 8, characterized in that it is performed only in a bed.

10. The fluidized bed gas according to 8 or 9, wherein the fluidized catalyst holding section is provided with an ash discharge line for discharging ash generated by thermal decomposition of the raw material. Furnace.

11. The fluidized-bed gasification furnace according to any one of 8. to 10., wherein a raw material inlet is provided upstream of the cyclone type particle separation section.

12. A gas fuel production method using a fluidized-bed gasification furnace, wherein the supplied raw material is supplied to a fluidized catalyst holding section of the gasification furnace by a fluidized catalyst having a function of decomposing a fluidized gas and tar. A first step in which pyrolysis is performed while suppressing generation to generate a pyrolysis gas; a second step in which particles in the pyrolysis product gas are separated and removed, and the particles are again subjected to the first step; In the reforming catalyst layer, the pyrolysis gas from which the particles have been removed is converted into residual carbon in the gas into carbon monoxide and hydrogen using a reforming catalyst having a steam and tar decomposition function. Through the process and through the tar content A gas fuel production method capable of obtaining a reduced gas fuel.

13. The method for producing a gaseous fuel using the fluidized-bed gasification furnace according to any one of 1 to 11, wherein the fluidized-bed gasification furnace is supplied with a fluidized gas through the gasification furnace. In the catalyst holding section, a first process in which pyrolysis is carried out by using a flowing gas and a fluid catalyst having a tar decomposition function while suppressing the production of tar to generate a pyrolysis product gas, and then particles in the pyrolysis product gas are separated and removed. And a second step of subjecting the particles to the first step again.Then, in the reforming catalyst layer, the pyrolysis product gas from which the particles have been removed is converted into gas using a reforming catalyst having a steam and tar decomposition function. A gas fuel production method capable of obtaining a gas fuel having a reduced evening content through a third step of converting the remaining evening oil into carbon monoxide and hydrogen.

14. The metal-supported zeolite catalyst is used for the fluidized catalyst holding part in the first step, and the metal-supported honeycomb catalyst is used for the reforming catalyst layer in the third step. Or the gas fuel production method described in 13.

1 5. 12.The nickel-supported zeolite catalyst is used for the fluidized catalyst holding part in the first step, and the metal-supported alumina honeycomb catalyst is used for the reforming catalyst layer in the third step. Or the gas fuel production method described in 13.

16. The gas fuel production method according to any one of 12. to 15., wherein the raw material is biomass such as woody biomass.

17. A fluidized-bed gasifier according to any one of 17.1 to 11.1, and a power generator, which is provided in communication with the fluidized-bed gasifier via a fluidized gas line and a product gas line. A gas power generation system comprising: a gas turbine serving as a motor; and a generator connected to a rotor provided in the gas turbine.

1 8. The gas bin consists of a compressor, a combustor, a turbine, and a regenerator, and hot water for supplying hot water using exhaust heat is provided on the downstream side of the regenerator. 17. The gas power generation system according to item 7, wherein a gas generator is provided.

1 9. The gas power generation system according to 1 7. or 1 8., wherein the raw material used is biomass such as woody biomass.