AU2012256839B2 - Coal gasification system - Google Patents

Coal gasification system Download PDF

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Publication number
AU2012256839B2
AU2012256839B2 AU2012256839A AU2012256839A AU2012256839B2 AU 2012256839 B2 AU2012256839 B2 AU 2012256839B2 AU 2012256839 A AU2012256839 A AU 2012256839A AU 2012256839 A AU2012256839 A AU 2012256839A AU 2012256839 B2 AU2012256839 B2 AU 2012256839B2
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Prior art keywords
gas
coal
char
carbon dioxide
partial oxidation
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AU2012256839A
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AU2012256839A1 (en
Inventor
Masumi Itonaga
Katsushi Kosuge
Hiroyuki Kozuru
Yasuki Namiki
Suguru Takeda
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Nippon Steel Engineering Co Ltd
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Nippon Steel and Sumikin Engineering Co Ltd
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/482—Gasifiers with stationary fluidised bed
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/485—Entrained flow gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/721—Multistage gasification, e.g. plural parallel or serial gasification stages
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C10J2300/0933—Coal fines for producing water gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C10J2300/0936—Coal fines for producing producer gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
    • C10J2300/1612—CO2-separation and sequestration, i.e. long time storage
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
    • C10J2300/1815—Recycle loops, e.g. gas, solids, heating medium, water for carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
    • C10J2300/1823—Recycle loops, e.g. gas, solids, heating medium, water for synthesis gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/005—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
    • C10K3/04—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment reducing the carbon monoxide content, e.g. water-gas shift [WGS]

Abstract

A coal gasification system (1) for gasifying coal, which is provided with: a coal gasification reaction furnace (13) which has a partial oxidation unit (21) and a thermal decomposition unit (22); a carbon dioxide recovery device (18) which separates a product gas produced in the coal gasification reaction furnace into a thin gas that has a low carbon dioxide gas concentration and a thick gas that has a higher carbon dioxide gas concentration in comparison to the thin gas; a thin gas channel (25) through which the thin gas is carried; a thick gas channel (26) through which the thick gas is carried; a first carrier device (11) which carries and supplies coal to the partial oxidation unit by air currents using the thin gas as a carrier gas; and a second carrier device (12) which carries and supplies coal to the thermal decomposition unit by air currents using the thick gas as a carrier gas.

Description

DESCRIPTION
Title of Invention COAL GASIFICATION SYSTEM
Technical Field [0001]
The present invention relates to a coal gasification system which produces carbon monoxide gas and the like using coal as a raw material.
Priority is claimed on Japanese Patent Application No. 2011-112514, filed May 19, 2011, the content of which is incorporated herein by reference.
Background Art [0002]
In the related art, in order to efficiently produce combustible gas and the like by gasifying coal, coal gasification systems which are provided with coal gasification reactors having various configurations such as a fixed bed type, a fluidized bed type, and an entrained flow type have been studied.
One of the coal gasification systems is a synthesis system (coal gasification system) disclosed in PTL 1. In this synthesis system, when carbonaceous fuel and oxygen-containing gas are supplied to a burner of a coal gasification reactor, gas containing carbon dioxide gas is used instead of nitrogen gas which is used as a carrier gas in a synthesis system of the related art.
[0003]
As this carrier gas, carbon dioxide gas, which is separated and recovered by a carbon dioxide gas recovery system (carbon dioxide recovery device) in the synthesis system which consumes energy, is used.
Citation List
Patent Literature [0004] [PTL 1] Published Japanese Translation No. 2009-511692 of the PCT International Publication
Summary of Invention
Problem to be Solved by the Invention [0005] However, in the synthesis system disclosed in PTL 1, merely, nitrogen gas which is used as a carrier gas is replaced with carbon dioxide gas. Accordingly, there is a problem in that the amount of carbon dioxide gas, which should be recovered by the carbon dioxide recovery system which consumes energy, increases by the amount thereof used for the carrier gas.
[0006] There is a need to provide a coal gasification system capable of reducing the amount of carbon dioxide gas which is recovered by a carbon dioxide recovery device.
[0006a] It is an object of the present invention to substantially satisfy the above need.
Means for Solving the Problem [0007] According to the invention, there is provided a coal gasification system of producing at least hydrogen gas and carbon monoxide gas by gasifying coal, the system including: a coal gasification reactor that has a two-stage gasification section in which a partial oxidation section, which partially oxidizes the coal, is disposed in a lower stage and a pyrolysis section, which is connected to the partial oxidation section and pyrolyzes the coal, is disposed in an upper section; a carbon dioxide recovery device of separating produced gas, which contains carbon dioxide gas produced in the coal gasification reactor and contains carbon monoxide gas and hydrogen gas as major components, into lean gas with combustibility having a low concentration of carbon dioxide gas and rich gas having a higher concentration of carbon dioxide gas than that of the lean gas; a lean gas passage that is connected to the carbon dioxide recovery device and through which the lean gas is carried; a rich gas passage that is connected to the carbon dioxide recovery device and through which the rich gas is carried; a first carrying device that is connected to the lean gas passage and through which the coal is carried with lean gas used as a carrier gas and supplied to the partial oxidation section; and a second carrying device that is connected to the rich gas passage and through which the coal is carried with lean gas used as a carrier gas and supplied to the pyrolysis section.
[0008]
According to the invention, since the produced gas contains hydrogen gas, carbon monoxide gas, carbon dioxide gas, and the like, the lean gas is combustible gas which contains hydrogen gas and carbon monoxide gas as major components.
[0009]
In addition, the above-described coal gasification system may further include a char recovery device of recovering char produced in the pyrolysis section; and a char carrying device through which the char is carried with a carrier gas and supplied to the partial oxidation section, and which may be connected to the rich gas passage, and the rich gas may be used as the carrier gas.
[0010]
According to the invention, in the partial oxidation section, when carbon in char and carbon dioxide gas in rich gas react with each other, the carbon dioxide gas promotes a carbon monoxide gas-producing reaction as an oxidant. As a result, carbon monoxide gas can be effectively produced.
[0011]
In addition, the above-described coal gasification system may further include a char recovery device of recovering char produced in the pyrolysis section, and the char recovered in the char recovery device may be supplied to the first carrying device such that the char is supplied to the partial oxidation section along with the coal which is carried by the first carrying device using the carrier gas.
[0012]
According to the invention, reaction rates of coal and char do not decrease without providing a char carrying device of carrying char independently of the coal. As a result, carrier gas (rich gas) used to supply char can be reduced. Furthermore, since a char supplying device and a char supplying nozzle are not provided, the size of the coal gasification system can be reduced.
Effects of the Invention [0013]
In the coal gasification system according to the invention, when the first carrying devices carries coal to the partial oxidation section using a carrier gas, carbon dioxide lean gas is used as the carrier gas. As a result, the amount of carbon dioxide gas which is required for the operation of the entire coal gasification system can be reduced.
In addition, when coal supplied into the partial oxidation section is gasified, the burner flames can be stabilized, and the reaction rate of coal can be improved.
Brief Description of Drawing [0014] FIG. 1 is a block diagram illustrating a coal gasification system according to an embodiment of the invention.
Description of Embodiments [0015]
Hereinafter, an embodiment of a coal gasification system according to the invention will be described with reference to FIG. 1.
The coal gasification system is a plant which gasifies coal as a raw material to produce hydrogen gas, carbon monoxide gas, and the like.
The coal gasification system 1 according to the embodiment includes a first coal supplying device (first carrying device) 11, a second coal supplying device (second carrying device) 12, a gasification rector (coal gasification reactor) 13, a heat recovery device 14, a dust removal device (char recovery device) 15, a shift reactor 16, a gas cooling/gas purification device 17, a CO2 recovery device (carbon dioxide recovery device) 18, and a char supplying device (char carrying device) 19.
[0016]
Various kinds of coals such as bituminous coal, subbituminous coal, and brown coal can be supplied to the coal gasification system 1 according to the embodiment. In general, particle sizes of coal are uneven, and bituminous coal, subbituminous coal, and brown coal contain a large amount of water of, for example, approximately 10% to 60%.
Therefore, by pulverizing and heating coal in a pulverizing and drying device (not illustrated), the coal is dried such that the water content is 2% to 20%. Furthermore, the coal is pulverized such that the average particle size is, for example, approximately 10 pm to 100 pm. The pulverized coal is supplied to the first coal supplying device 11 and the second coal supplying device 12. In this specification, “average particle size” refers to the particle size which has a cumulative value of 50% in a particle size distribution obtained with a laser diffraction scattering method.
The first coal supplying device 11 supplies the pulverized coal to a partial oxidation section 21 (described below) of the gasification reactor 13 using lean gas (described below), in which carbon dioxide is separated by the CO2 recovery device 18, as a carrier gas. Likewise, the second coal supplying device 12 supplies coal to a pyrolysis section 22 (described below) of the gasification reactor 13 using rich gas (described below), in which carbon dioxide is separated by the CO2 recovery device 18, as carrier gas.
The lean gas is a combustible gas which contains hydrogen gas and carbon monoxide gas as major components, and the rich gas is a gas which contains carbon dioxide gas as a major component.
[0017]
The gasification reactor 13 has a structure having two chambers in two stages in which the partial oxidation section 21 is disposed in a lower stage; and the pyrolysis section 22 connected to the partial oxidation section 21 is disposed in an upper stage. A slag cooling water bath (not illustrated) connected to the partial oxidation section 21 is provided below the partial oxidation section 21. The partial oxidation section 21 and the pyrolysis section 22 are reactor vessels in which a space having a predetermined size is provided, and are formed of a heat-resistant refractory as well as the slug cooling water bath.
The partial oxidation section 21 is provided with a gasification burner 21a and a char supplying nozzle 21b. Coal, oxygen gas separated by an air separator (not illustrated), and steam produced in the heat recovery device 14 are supplied from the first coal supplying device 11 into the partial oxidation section 21 through the gasification burner 21a. Char (ungasified coal residue or pyrolysis residue) is supplied from the char supplying device 19 into the partial oxidation section 21 through the char supplying nozzle 21b.
[0018]
The pulverized coal, char, oxygen gas, and steam which are supplied into the partial oxidation section 21 move upward while rotating in the partial oxidation section 21. At this time, the inside of the partial oxidation section 21 is in an environment of a high temperature and a high pressure (for example, a temperature of 1300°C to 1800°C and a pressure of 2 MPa to 5 MPa). In this environment, coal and char are gasified, and high-temperature carbon monoxide gas, carbon dioxide gas, hydrogen gas, and slag (ash) are produced according to the following reaction formulae (1) to (4).
(1) (2) (3) (4) [0019]
The gas, char, slag and the like produced in the partial oxidation section 21 move upward in the partial oxidation section 21 while rotating and move into the pyrolysis section 22.
The slag produced in the partial oxidation section 21 is in the molten state. A portion of the slag is cooled in an inner surface of the partial oxidation section 21 and is attached onto the inner surface; and the other portion thereof is dropped into water in the slag cooling water bath and is cooled and recovered.
[0020]
The pyrolysis section 22 is provided with a supplying nozzle 22a. Coal is supplied from the second coal supplying device 12 into the pyrolysis section 22 through the supplying nozzle 22a. A predetermined amount of steam produced in the heat recovery device 14 may be simultaneously supplied along with coal.
In this embodiment, the internal temperature of the pyrolysis section 22 is adjusted to be 950°C to 1200°C (preferably 1000°C to 1150°C). When the internal temperature of the pyrolysis section 22 is lower than 950°C, the amount of tar emission rapidly increases. Furthermore, it is difficult for a tar decomposition reaction to occur in the pyrolysis section 22.
Carbon in coal and steam which are supplied into the pyrolysis section 22 react according to the above-described reaction formula (3) and are decomposed into carbon monoxide gas and hydrogen gas.
[0021]
In addition, a part of carbon in coal which is supplied into the pyrolysis section 22 reacts with carbon dioxide gas in the pyrolysis section 22 and is converted into carbon monoxide gas according to the above-described reaction formula (4).
[0022]
High-temperature produced gas, which contains hydrogen gas, carbon monoxide gas, carbon dioxide gas, and the like produced in the pyrolysis section 22, is carried along with char to be supplied to the heat recovery device 14. The produced gas contains carbon monoxide gas and hydrogen gas as major components.
In the heat recovery device 14, the produced gas and char exchange heat with cooling water to be cooled, and the cooling water is converted into steam. A predetermined amount of the steam produced in the heat recovery device 14 is supplied to the partial oxidation section 21 and the pyrolysis section 22.
The produced gas and char which are cooled in the heat recovery device 14 are supplied to the dust removal device 15. In the dust removal device 15, a cyclone and a filter which are not illustrated are provided. Char filtered through the filter is removed using lean gas from the filter and is recovered along with char recovered in the cyclone. The char recovered in the dust removal device 15 is supplied to the char supplying device 19.
After passing through the dust removal device 15, the produced gas is supplied to the shift reactor 16. In order to increase a ratio of hydrogen gas to carbon monoxide gas in the produced gas to a given value, a predetermined amount of steam is supplied to the produced gas before the produced gas enters the shift reactor 16. Due to a shift reaction represented by the following reaction formula (5), carbon monoxide gas and steam in the produced gas react with each other to produce hydrogen gas and carbon dioxide gas.
(5) [0023]
The produced gas of which components are controlled in the shift reactor 16 is supplied to the gas cooling/gas purification device 17. Impurity gas and the like in the produced gas which is represented by a sulfur compound are recovered by the gas cooling/gas purification device 17.
After passing through the gas cooling/gas purification device 17, the produced gas is carried to the CO2 recovery device 18. In the CO2 recovery device 18, this produced gas is separated into lean gas having a low concentration of carbon dioxide gas and rich gas having a higher concentration of carbon dioxide than that of the lean gas with a well-known method. By applying a well-known method of simultaneously separating hydrogen sulfide gas and carbon dioxide gas to the CO2 recovery device 18, a desulfurization function may not be provided in the gas purification of the previous stage.
The concentration of carbon dioxide gas in the lean gas is adjusted to be, for example, lower than or equal to 20% by weight ratio. In addition, as described above, the lean gas contains hydrogen gas and carbon monoxide gas as major components.
On the other hand, the concentration of carbon dioxide gas in the rich gas is adjusted to be, for example, higher than or equal to 90%.
[0024]
To the CO2 recovery device 18, one end of a lean gas passage 25 through which the separated lean gas is carried; and one end of a rich gas passage 26 through which the rich gas is carried are connected.
In the lean gas passage 25, a compressor 27 is provided. The compressor 27 increases the pressure of the lean gas flowing through the lean gas passage 25.
Likewise, in the rich gas passage 26, a compressor 28 is provided. The compressor 28 increases the pressure of the rich gas flowing through the rich gas passage 26.
The other end of the lean gas passage 25 is connected to the first coal supplying device 11 and the gasification burner 21a of the partial oxidation section 21. In addition, the other end of the rich gas passage 26 is connected to the second coal supplying device 12, the supplying nozzle 22a of the pyrolysis section 22, and the char supplying device 19.
[0025] A portion of the lean gas separated in the C02 recovery device 18 is carried to a downstream process to produce synthesis gas such as methane or methanol. A portion of the rich gas separated in the C02 recovery device 18 is also carried to a downstream process.
An intermediate portion of the lean gas passage 25 is connected to the heat recovery device 14 and the dust removal device 15. The lean gas supplied from the lean gas passage 25 is used to blow materials attached to a cooling pipe of the heat recovery device 14, to purge each portion, and to remove attached char from the filter.
[0026]
The char supplying device 19 supplies char, recovered in the dust removal device 15, to the partial oxidation section 21 through the char supplying nozzle 21b using a carrier gas.
As the carrier gas used in the char supplying device 19, the rich gas flowing through the rich gas passage 26 is used.
[0027]
As described above, in the coal gasification system 1 according to the embodiment, the lean gas is used as the carrier gas for supplying coal from the first coal supplying device 11 to the partial oxidation section 21. As a result, the amount of carbon dioxide gas which is required for the operation of the entire coal gasification system 1 can be reduced. Furthermore, energy which is required to recover carbon dioxide gas in the CO2 recovery device 18 can be reduced. The combustible components in the lean gas such as hydrogen gas functions as a firelighter. Therefore, when coal supplied into the partial oxidation section 21 is gasified, the burner flames produced therein can be stabilized, and the gasification reactor 13 can operate stably and efficiently.
In addition, since the rich gas is supplied to the pyrolysis section 22 as the carrier gas of the second coal supplying device 12, coal is supplied to the pyrolysis section 22 in a state of being mixed with the rich gas. Therefore, due to carbon dioxide gas functioning as an oxidant, the reaction in which carbon in coal and carbon dioxide gas in the rich gas react with each other to be a carbon monoxide gas can be promoted, and carbon monoxide gas can be efficiently produced in the pyrolysis section 22.
[0028]
The coal gasification system 1 includes the dust removal device 15 that recovers char and the char supplying device 19 that carries char using the rich gas used as a carrier gas. Therefore, due to carbon dioxide gas functioning as an oxidant, in the partial oxidation section 21, the reaction in which carbon in char and carbon dioxide gas in the rich gas react with each other to be a monoxide gas is promoted . As a result, carbon monoxide gas can be efficiently produced.
[0029]
Hereinabove, the embodiment has been described with reference to the drawings. However, specific configurations of the invention are not limited to this embodiment and may include configuration changes without departing from the concept of the present invention.
For example, in the embodiment, as the lean gas, gas separated in the CO2 recovery device 18 is used. However, instead of this gas, a portion of the produced gas supplied from the gas cooling/gas purification device 17 to the CO2 recovery device 18 may also be used as the lean gas.
In addition, in the embodiment, the rich gas is used as the carrier gas of the char supplying device 19. However, the lean gas may also be used.
Furthermore, without providing the char supplying device 19 and the char supplying nozzle 21b for the coal gasification system 1, char recovered in the dust removal device 15 may be mixed with pulverized coal, which is carried by the first coal supplying device 11, and the mixture may be supplied to the partial oxidation section 21.
With such a configuration, the reaction rates of coal and char do not decrease without providing the char supplying device 19 and the char supplying nozzle 21b which carry and supply char independently of the coal. As a result, the carrier gas (rich gas) for supplying char can also be reduced. Furthermore, since the char supplying device 19 and the char supplying nozzle 21b are not provided, the size of the coal gasification system 1 can be reduced.
[0030] (Examples) A test was performed in the coal gasification system 1. In addition, the test was also performed in a coal gasification system according to Comparative Example in which nitrogen gas was used as a carrier gas of the first coal supplying device 11 and the second coal supplying device 12 of the coal gasification system 1.
[0031]
As a result, in the coal gasification system according to Comparative Example, a Carbon conversion ratio (value obtained by dividing the mass of carbon in gas by the mass of carbon in a raw material; and then multiplying the divided value by 100) in the partial oxidation section 21 was 95%. In the coal gasification system 1 according to the embodiment, a C conversion ratio was 97%, and it was found that the C conversion ratio was improved by approximately 2% as compared to Comparative Example.
In the coal gasification system according to Comparative Example, 40% of carbon with respect to carbon supplied to the pyrolysis section 22 was carried to a downstream process as char without being gasified, and was recovered. In the coal gasification system 1 according to the embodiment, the amount of carbon in char carried to a downstream process was reduced to 30% to 35%. It was found from the above results that carbon supplied to the pyrolysis section 22 could be efficiently gasified in the coal gasification system 1 according to the embodiment.
Industrial Applicability [0032]
In the coal gasification system according to the invention, when the first carrying devices carries coal to the partial oxidation section using a carrier gas, carbon dioxide lean gas is used as the carrier gas. As a result, the amount of carbon dioxide gas which is required for the operation of the entire coal gasification system can be reduced.
Reference Signs List [0033] I coal gasification system II first coal supplying device (first carrying device) 12 second coal supplying device (second carrying device) 13 gasification reactor (coal gasification reactor) 15 dust removal device (char recovery device) 18 CO2 recovery device (carbon dioxide recovery device) 19 char supplying device (char carrying device) 21 partial oxidation section 22 pyrolysis section 25 lean gas passage 26 rich gas passage

Claims (3)

1. A coal gasification system of producing at least hydrogen gas and carbon monoxide gas by gasifying coal, the system comprising: a coal gasification reactor that has a two-stage gasification section in which a partial oxidation section, which partially oxidizes the coal, is disposed in a lower stage and a pyrolysis section, which is connected to the partial oxidation section and pyrolyzes the coal, is disposed in an upper section; a carbon dioxide recovery device of separating produced gas, which contains carbon dioxide gas produced in the coal gasification reactor and contains carbon monoxide gas and hydrogen gas as major components, into lean gas with combustibility having a low concentration of carbon dioxide gas and rich gas having a higher concentration of carbon dioxide gas than that of the lean gas; a lean gas passage that is connected to the carbon dioxide recovery device and through which the lean gas is carried; a rich gas passage that is connected to the carbon dioxide recovery device and through which the rich gas is carried; a first carrying device that is connected to the lean gas passage and through which the coal is carried with lean gas used as a carrier gas and supplied to the partial oxidation section; and a second carrying device that is connected to the rich gas passage and through which the coal is carried with lean gas used as a carrier gas and supplied to the pyrolysis section.
2. The coal gasification system according to claim 1, further comprising: a char recovery device of recovering char produced in the pyrolysis section; and a char carrying device through which the char is carried with a carrier gas and supplied to the partial oxidation section, wherein the char carrying device is connected to the rich gas passage, and the rich gas is used as the carrier gas.
3. The coal gasification system according to claim 1, further comprising a char recovery device of recovering char produced in the pyrolysis section, wherein the char recovered in the char recovery device is supplied to the first carrying device such that the char is supplied to the partial oxidation section along with the coal which is carried by the first carrying device using the carrier gas.
AU2012256839A 2011-05-19 2012-05-15 Coal gasification system Active AU2012256839B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011-112514 2011-05-19
JP2011112514A JP5639955B2 (en) 2011-05-19 2011-05-19 Coal gasification system
PCT/JP2012/062400 WO2012157640A1 (en) 2011-05-19 2012-05-15 Coal gasification system

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JP5816770B1 (en) * 2015-05-22 2015-11-18 新日鉄住金エンジニアリング株式会社 Operation method of coal gasification system
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JPH11302666A (en) * 1998-04-15 1999-11-02 Nippon Steel Corp Process and apparatus for pneumatic bed gasification of coal
WO2010026932A1 (en) * 2008-09-08 2010-03-11 三菱重工業株式会社 Integrated coal gasification combined cycle power generation apparatus

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JPH05239474A (en) * 1991-02-04 1993-09-17 Central Res Inst Of Electric Power Ind Pressurized entrained bed coal gasification equipment
JPH06346065A (en) * 1993-06-07 1994-12-20 Mitsubishi Heavy Ind Ltd Gasification of organic material
JPH11302666A (en) * 1998-04-15 1999-11-02 Nippon Steel Corp Process and apparatus for pneumatic bed gasification of coal
WO2010026932A1 (en) * 2008-09-08 2010-03-11 三菱重工業株式会社 Integrated coal gasification combined cycle power generation apparatus

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