JP2012255114A - System and method for producing gasified gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and method for producing gasified gas, which can improve gasification efficiency without requiring particular cost.SOLUTION: The system for producing the gasified gas includes: a gasification furnace 4 that changes a fluid medium into a fluidized layer and gasifies an injected gasifying material by a heat that the fluid medium has to generate the gasified gas; a burning furnace 2 to which the fluid medium discharged from the gasification furnace 4, and a residue of the gasifying material are guided and where the fluid medium is heated and the residue is burned; an ash-agglomerated catalyst-producing unit 13 for producing an ash-agglomerated catalyst by agglomerating an ash generated from the residue of the gasifying material through a burning action in the burning furnace 2; an introduction unit 14 for introducing the ash-agglomerated catalyst generated in the ash-agglomerated catalyst-producing unit 13 into the burning furnace 2; and a supplying unit 6 for supplying, to the gasification furnace 4, the ash-agglomerated catalyst introduced from the introduction unit 14 to the burning furnace 2 and the fluid medium heated in the burning furnace 2.

Description

  The present invention relates to a gasification gas generation system and a gasification gas generation method including a gasification furnace using a fluidized medium.

  In recent years, a technology for generating gasification gas by gasifying gasification raw materials such as coal, biomass, and tire chips instead of petroleum has been developed. The gasified gas generated in this way can be used for efficient power generation systems such as Integrated Coal Gasification Combined Cycle (IGCC), hydrogen production, synthetic fuel (synthetic petroleum) production, chemical fertilizer ( (Urea) and other chemical products. Among gasification raw materials used as raw materials for gasification gas, coal, in particular, has a recoverable period of about 150 years, which is more than three times the extractable period of oil, and reserves are unevenly distributed compared to oil. Therefore, it is expected as a natural resource that can be supplied stably over a long period of time.

  As described above, for example, methods disclosed in Patent Documents 1 to 3 are known as methods for generating a gasification gas by gasifying a gasification raw material. In these gasification gas generation methods, for example, a fluid medium such as sand having a high temperature of 800 ° C. or higher is supplied to the gasification furnace, and gas such as water vapor, air, oxygen, carbon dioxide is supplied from the lower part of the gasification furnace. A fluidizing bed is formed by supplying an agent. Then, the gasification raw material is introduced into the gasification furnace in which the fluidized bed is formed and fluidized and heated to generate gasification gas.

  At this time, in the gasification gas generation methods shown in Patent Documents 1 to 3, gasification efficiency is improved by introducing a catalyst such as limestone and dolomite together with the gasification raw material into the gasification furnace.

JP 2009-40886 JP 2010-222517 A JP 2011-26490 A

  According to the gasification gas generation method described above, it is possible to improve the gasification efficiency by introducing the catalyst into the gasification furnace, but on the other hand, the purchase cost and the transportation cost of the catalyst are required. Therefore, further cost-effective improvement is desired for the generation of gasification gas.

  An object of this invention is to provide the gasification gas production | generation system and gasification gas production | generation method which can improve gasification efficiency, without requiring the purchase expense of a catalyst, and a conveyance expense.

  In order to solve the above problems, a gasified gas generation system of the present invention generates a gasified gas by forming a fluidized medium into a fluidized bed and gasifying the input gasified raw material with the heat of the fluidized medium. A gasification furnace, a fluidizing medium discharged from the gasification furnace and a residue of the gasification raw material are guided, the combustion medium which heats the fluidizing medium and burns the residue of the gasification raw material, and the combustion furnace Generated from the residue of the gasification raw material by the combustion action in the ash, and the ash aggregation catalyst generation unit for aggregating the ash containing the catalyst for promoting gasification to generate an ash aggregation catalyst, and the ash aggregation catalyst generation unit An introduction part for introducing the ash aggregation catalyst into the combustion furnace, and a supply part for supplying the ash aggregation catalyst introduced into the combustion furnace from the introduction part and the fluidized medium heated in the combustion furnace to the gasification furnace When, Characterized by comprising.

  Further, in the gasified gas generation system of the present invention, the supply unit separates the ash generated from the combustion exhaust gas guided from the combustion furnace and the residue of the gasification raw material from the fluidized medium and the ash aggregation catalyst. In addition, a separation device may be provided that guides the combustion exhaust gas and the ash to the ash aggregation catalyst generation unit and supplies the fluid medium and the ash aggregation catalyst to the gasification furnace.

  Further, the gasification gas generation system of the present invention comprises a gasification furnace for generating a gasification gas by gasifying the input gasification raw material with the heat of the fluidization medium while fluidizing the fluid medium. A fluidizing medium discharged from the gasification furnace and a residue of the gasification raw material are guided, a combustion furnace that heats the fluidizing medium and burns the residue of the gasification raw material, and the fluid heated in the combustion furnace A supply unit that supplies a medium to the gasification furnace, and an ash aggregation catalyst that is generated from the residue of the gasification raw material by a combustion action in the combustion furnace and aggregates the ash containing the catalyst that promotes the gasification An ash aggregation catalyst generation unit and an introduction unit for introducing the ash aggregation catalyst generated in the ash aggregation catalyst generation unit into the gasification furnace are provided.

  In addition, the gasified gas generation system of the present invention may further include a water vapor supply unit that supplies water vapor to the gasification furnace to fluidize the fluidized medium.

  In the gasified gas generation system of the present invention, the introduction unit may include an adjusting unit that adjusts an introduction amount of the ash aggregation catalyst.

  The gasified gas generation method of the present invention is a step of generating a gasified gas by forming a fluidized bed into a fluidized bed in a gasification furnace and gasifying the input gasified raw material with the heat of the fluidized medium. And heating the fluid medium discharged from the gasification furnace in a combustion furnace and burning the residue of the gasification raw material, and generating from the residue of the gasification raw material by a combustion action in the combustion furnace, A step of agglomerating ash containing a catalyst for promoting gasification to produce an ash agglomeration catalyst; a step of introducing the produced ash agglomeration catalyst into the combustion furnace; an ash agglomeration catalyst introduced into the combustion furnace; Supplying the fluidized medium heated in the combustion furnace to the gasification furnace.

  The gasified gas generation method of the present invention is a step of generating a gasified gas by forming a fluidized bed into a fluidized bed in a gasification furnace and gasifying the input gasified raw material with the heat of the fluidized medium. Heating the fluid medium discharged from the gasification furnace in the combustion furnace and burning the residue of the gasification raw material, and supplying the fluid medium heated in the combustion furnace to the gasification furnace And a step of agglomerating ash containing a catalyst that promotes gasification by a combustion action in the combustion furnace to produce an ash aggregation catalyst, Introducing into the gasifier.

  According to the present invention, since the ash aggregation catalyst generated from the residue of the gasification raw material is circulated and introduced into the gasification furnace, the gasification efficiency can be improved without requiring the purchase cost or the transportation cost of the catalyst. Can do.

It is explanatory drawing for demonstrating the specific structure of the gasification gas production | generation system concerning 1st Embodiment. It is explanatory drawing for demonstrating the specific structure of the gasification gas production | generation system concerning 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram for explaining a specific configuration of a gasification gas generation system 1 according to the first embodiment. In the gasified gas generation system 1, as a whole, a fluid medium composed of sand such as dredged sand (silica sand) having a particle size of about 300 μm is circulated as a heat medium. Specifically, the fluid medium is first heated to about 1000 ° C. in the combustion furnace 2 and introduced into the medium separator 3 (separator) together with the combustion exhaust gas. In the medium separator 3, the hot fluid medium and the combustion exhaust gas are separated, and the separated hot fluid medium is supplied to the gasifier 4. And when a fluidized medium is supplied to the gasification furnace 4, water vapor | steam will be introduce | transduced as a gasifying agent from the water vapor storage part 5, and a fluidized bed will be formed by this. Below, each apparatus which comprises the gasification gas production | generation system 1 is demonstrated concretely.

  The gasification furnace 4 communicates with the medium separation device 3 via a supply passage 6 (supply part), and the fluidized medium separated from the combustion exhaust gas by the medium separation device 3 is supplied from the supply passage 6 into the gasification furnace 4. To be supplied. A water vapor storage section 5 is provided below the gasification furnace 4. The water vapor supplied from the water vapor supply source 7 is temporarily stored in the water vapor storage section 5, and the water vapor stored in the water vapor storage section 5. Is introduced into the gasification furnace 4 from the bottom of the gasification furnace 4. Thus, a fluidized bed is formed in the gasification furnace 4 by introducing water vapor into a high-temperature fluid medium.

  Further, the gasification furnace 4 is provided with a gasification raw material input unit 4a for supplying gasification raw materials such as coal such as lignite, petroleum coke (petro coke), biomass and tire chips to the fluidized bed. ing. The gasified raw material charged from the gasified raw material charging unit 4a is gasified by heat of about 700 ° C. to 900 ° C. included in the fluidized medium fluidized by water vapor, thereby generating gasified gas. .

  The gasified gas generated in this manner is derived from a gasified gas deriving unit 4b provided in the gasification furnace 4, and then recovered by a recovery device (not shown). The gasification furnace 4 communicates with the combustion furnace 2 via the communication path 8. The communication path 8 is connected to a side wall that faces the side wall to which the supply path 6 is connected. Therefore, the fluidized medium supplied from the supply passage 6 into the gasification furnace 4 flows toward the communication passage 8 in the gasification furnace 4 and is then discharged to the combustion furnace 2 through the communication passage 8. It becomes.

  At this time, in the gasification furnace 4, a part of the input gasification raw material becomes unreacted, and the residue of the gasification raw material is discharged into the combustion furnace 2 together with the fluidized medium. As described above, water vapor, air, oxygen, carbon dioxide, or the like can be used as the gasifying agent supplied to form the fluidized bed. When water vapor is used as a gasifying agent as in this embodiment, the residue of the gasification raw material is discharged to the combustion furnace 2 as a solid. Further, for example, when high-temperature oxygen of about 1300 ° C. to 1500 ° C. is used as the gasifying agent, it is considered that the charged gasification raw material is almost completely burned. In some cases, a part of the gasification raw material is incompletely combusted and discharged to the combustion furnace 2 as a solid.

  As described above, the residue of the gasification raw material and the fluid medium discharged from the gasification furnace 4 to the combustion furnace 2 through the communication passage 8 are heated to about 1000 ° C. in the combustion furnace 2. Thereby, the residue of the gasification raw material burns and becomes ash containing a catalyst for promoting gasification in the gasification furnace 4. Further, in the combustion furnace 2, a flow of combustion exhaust gas is generated from the lower side to the upper side. By this flow, the ash generated from the residue of the gasification raw material and the fluid medium heated to about 1000 ° C. Then, it is led to the medium separation device 3 through the connection path 9 together with the combustion exhaust gas.

  The medium separator 3 swirls a mixed substance of combustion exhaust gas, ash, and fluidized medium guided from the connection path 9. At this time, the ash in the mixed material is lighter and smaller in particle size than the fluid medium. Accordingly, the ash is separated into the gas pipe 10 together with the combustion exhaust gas, and the fluidized medium is separated into the supply passage 6. As a result, the high-temperature fluid medium heated in the combustion furnace 2 is supplied again to the gasification furnace 4 through the supply passage 6, and thereafter the above-described circulation is repeated.

  On the other hand, the gas pipe line 10 is connected to the ash dust collector 12 via the heat exchanger 11, and the combustion exhaust gas and ash guided to the gas pipe line 10 are cooled in the heat exchanger 11, and then the ash dust collector. 12 separates into flue gas and ash. The combustion exhaust gas separated here is discharged to the atmosphere through a pipe or the like (not shown), and the collected ash is sent to the ash aggregation catalyst generator 13.

  The ash aggregation catalyst generation unit 13 is configured by a well-known granulating apparatus, and the ash collected by the ash dust collector 12 is granulated (aggregated) by compression granulation, melt granulation, or the like, and ash catalyst particles ( Ash aggregation catalyst). Here, the ash components contained in gasification raw materials such as coal and biomass are not themselves gasified and combusted, and ash produced from the residue of gasification raw materials includes sodium, potassium and calcium. In addition, components such as transition metals are included. These components are known to promote the gasification reaction. Therefore, the ash aggregation catalyst generation unit 13 generates ash catalyst particles as a catalyst for promoting the gasification reaction.

  The ash catalyst particles generated by the ash aggregation catalyst generation unit 13 may have any mass, shape, and particle size that can be separated into the supply passage 6 together with the fluid medium in the medium separation device 3 described above. In the furnace 4, it is more preferable that the mass, shape, and particle size behave in the same manner as the fluid medium. Moreover, it is good also as producing | generating an ash catalyst particle by adding organic substance and another component in the case of granulation of an ash catalyst particle.

  The ash aggregation catalyst generation unit 13 is connected to the combustion furnace 2 through a catalyst introduction path 14 (introduction section), and the generated ash catalyst particles are introduced into the combustion furnace 2 through the catalyst introduction path 14. Will be. The catalyst introduction path 14 is provided with an adjusting means 15 for adjusting the amount of ash catalyst particles introduced from the ash aggregation catalyst generator 13 into the combustion furnace 2. The adjusting means 15 is configured by, for example, an open / close valve that allows the catalyst introduction path 14 to communicate with or shuts off the communication, a fan that introduces ash catalyst particles into the combustion furnace 2 by blowing air, a pressure feed pump, or the like. ing.

  In the gasification gas generation system 1, based on the detection means (not shown) for detecting the amount of gasification raw material introduced into the gasification furnace 4, the generation amount of the gasification gas, etc., and the detection results of each detection means. Control means (not shown) for controlling the adjusting means 15 is provided. That is, the adjusting means 15 adjusts the amount of ash catalyst particles introduced into the combustion furnace 2 according to the gasification efficiency in the gasification furnace 4.

  The ash catalyst particles introduced into the combustion furnace 2 as described above are heated in the combustion furnace 2 and, together with the fluid medium, the ash generated from the residue of the gasification raw material, and the combustion exhaust gas, through the connection path 9. To the medium separator 3. That is, when the ash catalyst particles are introduced into the combustion furnace 2 from the catalyst introduction path 14, the above mixed substance is constituted by the fluid medium, the ash generated from the residue of the gasification raw material, the combustion exhaust gas, and the ash catalyst particles. Will be.

  Then, the ash catalyst particles contained in the mixed material are separated into the supply passage 6 together with the fluidized medium in the medium separation device 3 and supplied to the gasification furnace 4. Thus, the gasification efficiency in the gasification furnace 4 can be improved by supplying the ash catalyst particles to the gasification furnace 4 in the circulation process of the gasification gas generation system 1. Moreover, since the ash catalyst particles react with oxygen in the combustion furnace 2 and are activated and supplied to the gasification furnace 4, the catalytic function can be further improved.

  FIG. 2 is an explanatory diagram for explaining a specific configuration of the gasification gas generation system 20 according to the second embodiment. The gasification gas generation system 20 of the second embodiment differs from the first embodiment only in that the ash catalyst particles generated by the ash aggregation catalyst generation unit 13 are introduced into the gasification furnace 4. The configuration is the same as in the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and differences from the first embodiment are mainly described.

  In the gasification gas generation system 20, the ash aggregation catalyst generation unit 13 and the gasification furnace 4 are connected via a catalyst introduction path 21. Similarly to the above, the catalyst introduction path 21 is provided with the adjusting means 15, and the introduction amount of the ash catalyst particles adjusted by the adjusting means 15 is introduced into the gasifier 4. Therefore, the flow of each substance in the gasified gas generation system 20 of the second embodiment is as follows.

  That is, when a gasification raw material is charged into the gasification furnace 4, gasification gas is generated by the heat of the fluidized medium that forms a fluidized bed in the gasification furnace 4, and the generated gasification gas is gasification gas. It is guided from the deriving unit 4b to the recovery device. Further, the fluidized medium that forms the fluidized bed in the gasification furnace 4 is discharged into the combustion furnace 2 together with the unreacted gasification raw material residue in the gasification furnace 4. In the combustion furnace 2, the fluidized medium is heated, and the residue of the gasification raw material becomes ash containing a catalyst that promotes gasification by the combustion action, and the fluidized medium and ash are introduced to the medium separation device 3 together with the combustion exhaust gas. It is burned.

  In the medium separator 3, the combustion exhaust gas and ash are separated from the fluid medium, and the fluid medium is supplied to the gasification furnace 4 through the supply passage 6. On the other hand, the combustion exhaust gas and ash are guided to the heat exchanger 11 and the ash dust collector 12 through the gas conduit 10, and the combustion exhaust gas is discharged from the ash dust collector 12 to the atmosphere through a pipe (not shown), and the ash is agglomerated ashes. Guided to the catalyst generator 13. The ash catalyst particles generated by the ash aggregation catalyst generation unit 13 are introduced into the gasification furnace 4 via the catalyst introduction path 21. As described above, the gasification gas generation system 20 of the second embodiment can also improve the gasification efficiency in the gasification furnace 4 in the circulation process.

  In addition, in each said embodiment, although the system which produces | generates gasification gas was demonstrated, said description can also be grasped | ascertained as a gasification gas production | generation method. In this case, the specific configuration of each device is not particularly limited as long as each of the above steps can be performed.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  The present invention can be applied to a gasification gas generation system and a gasification gas generation method provided with a gasification furnace using a fluidized medium.

DESCRIPTION OF SYMBOLS 1,20 ... Gasification gas production | generation system 2 ... Combustion furnace 3 ... Medium separator 4 ... Gasification furnace 6 ... Supply passage 7 ... Steam supply source 13 ... Ash aggregation catalyst production | generation part 14, 21 ... Catalyst introduction path 15 ... Adjustment means

Claims (7)

A gasification furnace that fluidizes the fluidized medium and gasifies the input gasification raw material with the heat of the fluidized medium to generate a gasified gas;
A combustion furnace in which the fluidized medium discharged from the gasification furnace and the residue of the gasification raw material are guided, and the fluidization medium is heated and burns the gasification raw material residue;
An ash aggregation catalyst generation unit that generates an ash aggregation catalyst by aggregating ash containing a catalyst that promotes gasification, which is generated from a residue of the gasification raw material by a combustion action in the combustion furnace;
An introduction unit for introducing the ash aggregation catalyst generated in the ash aggregation catalyst generation unit into the combustion furnace;
A gasification gas generation system comprising: an ash aggregation catalyst introduced into the combustion furnace from the introduction part; and a supply part that supplies the fluidized medium heated in the combustion furnace to the gasification furnace. . The supply unit
The ash generated from the combustion exhaust gas and the residue of the gasification raw material introduced from the combustion furnace is separated from the fluid medium and the ash aggregation catalyst, and the combustion exhaust gas and the ash are separated into the ash aggregation catalyst generation unit. The gasification gas generation system according to claim 1, further comprising a separation device that guides the fluidized medium and the ash aggregation catalyst to the gasification furnace. A gasification furnace that fluidizes the fluidized medium and gasifies the input gasification raw material with the heat of the fluidized medium to generate a gasified gas;
A combustion furnace in which the fluidized medium discharged from the gasification furnace and the residue of the gasification raw material are guided, and the fluidization medium is heated and burns the gasification raw material residue;
A supply unit for supplying the fluidizing medium heated in the combustion furnace to the gasification furnace;
An ash aggregation catalyst generation unit that generates an ash aggregation catalyst by aggregating ash containing a catalyst that promotes gasification, which is generated from a residue of the gasification raw material by a combustion action in the combustion furnace;
A gasification gas generation system comprising: an introduction unit that introduces the ash aggregation catalyst generated in the ash aggregation catalyst generation unit into the gasification furnace.   The gasified gas generation system according to any one of claims 1 to 3, further comprising a water vapor supply means for supplying water vapor to the gasification furnace to fluidize the fluidized medium.   The gasification gas generation system according to any one of claims 1 to 4, further comprising adjusting means for adjusting the amount of the ash aggregation catalyst introduced. A step of fluidizing the fluidized medium in a gasification furnace and gasifying the input gasification raw material with heat of the fluidized medium to generate a gasified gas;
Heating the fluid medium discharged from the gasification furnace in a combustion furnace and burning the residue of the gasification raw material;
A step of agglomerating ash containing a catalyst that promotes gasification produced from a residue of the gasification raw material by a combustion action in the combustion furnace to produce an ash aggregation catalyst;
Introducing the produced ash aggregation catalyst into the combustion furnace;
And a step of supplying the ash aggregation catalyst introduced into the combustion furnace and the fluidized medium heated in the combustion furnace to the gasification furnace. A step of fluidizing the fluidized medium in a gasification furnace and gasifying the input gasification raw material with heat of the fluidized medium to generate a gasified gas;
Heating the fluid medium discharged from the gasification furnace in a combustion furnace and burning the residue of the gasification raw material;
Supplying the fluidized medium heated in the combustion furnace to the gasification furnace;
A step of agglomerating ash containing a catalyst that promotes gasification produced from a residue of the gasification raw material by a combustion action in the combustion furnace to produce an ash aggregation catalyst;
Introducing the produced ash aggregation catalyst into the gasification furnace.

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