CN109251769A - A kind of the dry coal powder gasification IGCC power plant and method of co-production of synthetic natural gas - Google Patents
A kind of the dry coal powder gasification IGCC power plant and method of co-production of synthetic natural gas Download PDFInfo
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- CN109251769A CN109251769A CN201811280643.0A CN201811280643A CN109251769A CN 109251769 A CN109251769 A CN 109251769A CN 201811280643 A CN201811280643 A CN 201811280643A CN 109251769 A CN109251769 A CN 109251769A
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
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- 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
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- 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
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- 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
- C10J2300/1615—Stripping
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- 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
- C10J2300/1618—Modification of synthesis gas composition, e.g. to meet some criteria
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- 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
- C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
- C10J2300/1656—Conversion of synthesis gas to chemicals
- C10J2300/1662—Conversion of synthesis gas to chemicals to methane (SNG)
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- 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
- C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
- C10J2300/1675—Integration of gasification processes with another plant or parts within the plant with the production of electricity making use of a steam turbine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
- Industrial Gases (AREA)
Abstract
A kind of dry coal powder gasification IGCC power plant machine method for co-production of synthetic natural gas that the present invention improves, including gasification furnace, gas cooler, desulfurization unit, gas turbine, waste heat boiler, steam turbine, sulfur recovery unit, sulphur carbon take off unit, sulphur carbon separative unit, methanation unit and natural gas storage tank altogether；Allow IGCC system to have peak modulation capacity in power grid by way of adjusting synthesis gas in Generation Side and chemical industry synthesis side allocation proportion in power generation part coproduction chemical industry part, guarantee generation load in peak of power consumption, guarantees LNG yield when with gas peak；The system enables to the converting heat between Generation Side and chemical industry synthesis side sufficiently to couple with matter utilization simultaneously, realizes the cascade utilization between energy and synthesis gas components, is finally reached the maximization of energy conversion efficiency；It can increase the annual utilization hours of capital equipment in the case where keeping gasification unit and cryogenic air separation unit system loading constant, improve the economy of system.
Description
Technical field
The invention belongs to Clean Coal Power Generating Technologies fields, and in particular to a kind of IGCC and polygenerations systeme.
Background technique
There are improved efficiencies and CO for existing coal-based power generation technology2The problem of emission reduction, needs to develop efficient, cleaning, CO2Nearly zero
The coal power technology of discharge.IGCC integral gasification combined circulation technology by clean Coal Gasification Technology with efficiently combine and follow
Ring generation technology combines, it is easy to accomplish CO2Trapping, is one of important technology route of green coal-fired power.IGCC technology is at present
Technology period of expansion, the potentiality still greatly improved with efficiency are the coals for most possibly taking the lead in breaking through 50% power supply efficiency at no distant date
Base generation technology, and can generate electricity and be combined with high-temperature fuel cell, further increase the net efficiency of coal-based power generation technology.IGCC has
Natural pollution reduction advantage.The SO of China Tianjin IGCC Demonstration Station2, dust actual discharge be below 1mg/Nm3, NOx
Discharge is lower than 25mg/Nm3, reached the near-zero release of pollutant；And conventional coal unit is after minimum discharge is transformed, SO2Row
It lowers in 35mg/Nm3, dust is lower than 5mg/Nm3, NOx is lower than 50mg/Nm3, still have no small gap with the environmental-protecting performance of IGCC.
And the minimum discharge of conventional coal unit be based on low-sulfur coal, there are also desulfurized gypsum, the escaping of ammonia, waste denitration catalyst,
The problem of secondary pollutions such as desulfurization wastewater.In addition, CO before the burning based on IGCC2Trapping has CO2Concentration is high, partial pressure is high, gas
The small advantage for the treatment of capacity, trapping energy consumption are significantly less than CO after the burning of conventional coal unit2Low cost may be implemented in Trapping ways
Trap CO2。
IGCC technology system is more complex, and unit price at this stage is high, and cost of electricity-generating is also difficult to competing with conventional coal unit
It strives.Meanwhile there is also the problems of flexibility difference by IGCC, do not adapt to power grid to the depth peak regulation demand in coal base power station, mainly
The reason is that the cryogenic air separation unit system loading response speed in IGCC system is slow.
But IGCC system can keep gasification unit and cryogenic air separation unit system loading it is constant or in the case where, Ke Yitong
Coproduction chemicals is crossed, guarantees the long period oepration at full load of gasification unit and cryogenic air separation unit system, increases the annual interest of capital equipment
With hourage, the economy of system is improved；Can also by coproduction part chemical products, by adjust synthesis gas in Generation Side and
The mode of chemical industry synthesis side allocation proportion, allows IGCC system to have peak modulation capacity in power grid.
Summary of the invention
The purpose of the present invention is to provide the dry coal powder gasification IGCC power plant and method of a kind of co-production of synthetic natural gas,
It solves existing IGCC system and haves the defects that the depth peak regulation demand for not adapting to power grid to coal base power station, the present invention pass through
Co-production of synthetic natural gas increases the annual utilization hours of capital equipment, improves the economy of system.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of dry coal powder gasification IGCC power plant for co-production of synthetic natural gas that the present invention improves, including gasification furnace, coal
Gas Cooler, desulfurization unit, gas turbine, waste heat boiler, steam turbine, sulfur recovery unit, sulphur carbon take off unit, sulphur carbon separation list altogether
Member, methanation unit and natural gas storage tank, wherein the entrance of the raw gas outlet connection gas cooler of gasification furnace, coal gas are cold
But the entrance of the outlet connection preboiler of device, the entrance of the outlet connection steam turbine of preboiler；
The entrance and sulphur carbon of the outlet connection desulfurization unit of gas cooler take off the entrance of unit altogether, wherein desulfurization unit
Clean gas outlet connection gas turbine fuel gas entrance, the sour gas outlet connection sulfur recovery unit of desulfurization unit
Entrance；
Sulphur carbon takes off the unstripped gas entrance of the gas exit connection methanation unit of unit, the synthesis of natural of methanation unit altogether
The entrance of gas outlet connection natural gas storage tank, the outlet of natural gas storage tank connect gas turbine；
Sulphur carbon takes off the entrance of the gas vent connection sulphur carbon separative unit of unit altogether, and the sour gas of sulphur carbon separative unit goes out
The entrance of mouth connection sulfur recovery unit.
It preferably, further include cryogenic air separation unit system, the oxygen outlet of cryogenic air separation unit system connects the oxygen intake of gasification furnace,
The fuel gas entrance of the nitrogen outlet connection gas turbine of cryogenic air separation unit system.
Preferably, the outlet of gas cooler is connected with dust removing units, wherein the outlet of dust removing units connects desulfurization unit
Entrance and sulphur carbon altogether take off unit entrance.
Preferably, the entrance that sulphur carbon takes off unit altogether is connected with sulphur-resistant conversion unit.
Preferably, gasification furnace is provided with slag-drip opening.
Preferably, the outlet of methanation unit is connected with the entrance and natural gas line for compressing and liquefying unit.
A kind of dry coal powder gasification IGCC method of co-production of synthetic natural gas, the dry pulverized coal based on a kind of co-production of synthetic natural gas
Gasify IGCC power plant, comprising the following steps:
Raw coal becomes dry pulverized coal after pretreatment and is sent into gasification furnace, meanwhile, using middle pressure steam as the original of gasification reaction
Expect while being sent into gasification furnace, with middle pressure steam and the pure oxygen being sent into gasification furnace gasified reverse occurs for dry pulverized coal in gasification furnace
It answers, generates raw gas；
Raw gas is cooled in gas cooler, while generating saturated vapor, which is sent to waste heat boiler
Steam turbine power generation is sent into after continuing overheat；
Cooling raw gas is sent to power generation part or chemical industry synthesis part, wherein
When being sent to power generation part, raw gas after cooling carries out desulfurization by desulfurization unit, wherein sweetening process generates
Sour gas be sent into sulfur recovery unit generate sulphur, sweetening process generate clean gas as fuel gas feeding gas turbine
Acting power generation, the high-temperature flue gas that gas turbine generates are sent into waste heat boiler, and the steam that waste heat boiler generates is sent into steam turbine power generation；
When being sent to chemical industry synthesis part, the raw gas after cooling and dedusting passes through takes off unit removing H through over cure carbon altogether2S is acid
Gas and a part of CO2, the gas feeding sulphur carbon separative unit of removing, the H of sulphur carbon separative unit separation2S sour gas is sent into sulphur
Recovery unit generates sulphur, the CO of sulphur carbon separative unit separation2It is emptied；
Coal gas body after over cure carbon takes off unit altogether is sent into methanation unit as unstripped gas, can after generation synthetic natural gas
It is sent into natural gas storage tank, the fuel gas when natural gas in natural gas storage tank is as gas turbine starting or underload.
Preferably, the oxygen intake of gasification furnace is connected with the oxygen outlet of cryogenic air separation unit system, the nitrogen of cryogenic air separation unit system
After injecting fuel gas after gas outlet pressurization, it is sent into acting power generation in gas turbine.
Compared with prior art, the beneficial effects of the present invention are:
The dry coal powder gasification IGCC power plant of a kind of co-production of synthetic natural gas provided by the invention, in power generation part coproduction
Chemical industry part allows IGCC system to exist by way of adjusting synthesis gas in Generation Side and chemical industry synthesis side allocation proportion
Have peak modulation capacity in power grid, guarantee generation load in peak of power consumption, guarantees LNG yield when with gas peak；The system is same
When enable to the converting heat between Generation Side and chemical industry synthesis side sufficiently to couple with matter utilization, realize energy and synthesis gas
Cascade utilization between component is finally reached the maximization of energy conversion efficiency；It can keep gasification unit and cryogenic air separation unit system
In the case that load of uniting is constant, increases the annual utilization hours of capital equipment, improve the economy of system.
Further, chemical industry synthesis side generate natural gas a part can be sent into natural gas line or LNG is made, send to
Other natural gas users, another part can be sent into natural gas storage tank, fuel gas when as gas turbine starting or underload.
The dry coal powder gasification IGCC electricity-generating method of a kind of co-production of synthetic natural gas provided by the invention, in power generation part coproduction
Chemical industry part allows IGCC system to exist by way of adjusting synthesis gas in Generation Side and chemical industry synthesis side allocation proportion
Have peak modulation capacity in power grid, guarantee generation load in peak of power consumption, guarantees LNG yield when with gas peak；The system is same
When enable to the converting heat between Generation Side and chemical industry synthesis side sufficiently to couple with matter utilization, realize energy and synthesis gas
Cascade utilization between component is finally reached the maximization of energy conversion efficiency；It can keep gasification unit and cryogenic air separation unit system
In the case that load of uniting is constant, increases the annual utilization hours of capital equipment, improve the economy of system.
Detailed description of the invention
Fig. 1 is dry coal powder gasification IGCC power plant structural schematic diagram of the present invention；
Wherein, 1, gasification furnace 2, gas cooler 3, dust removing units 4, desulfurization unit 5, gas turbine 6, waste heat boiler 7, vapour
Turbine 8, cryogenic air separation unit system 9, sulfur recovery unit 10, sulphur-resistant conversion unit 11, sulphur carbon take off unit 12, sulphur carbon separative unit altogether
13, methanation unit 14, compress and liquefy unit 15, natural gas storage tank.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, dry coal powder gasification IGCC power plant and the side of a kind of co-production of synthetic natural gas provided by the invention
Method reduces cost of electricity-generating, while can also be achieved the depth electric power tune of IGCC system for improving IGCC system year hours of operation
Peak function.In order to achieve the above objectives, the dry coal powder gasification IGCC power plant of a kind of co-production of synthetic natural gas provided by the invention,
Including gasification furnace 1, gas cooler 2, dust removing units 3, desulfurization unit 4, gas turbine 5, waste heat boiler 6, steam turbine 7, deep cooling
Space division system 8, sulfur recovery unit 9, sulphur-resistant conversion unit 10, sulphur carbon take off unit 11, sulphur carbon separative unit 12, methanation unit altogether
13, unit 14 and natural gas storage tank 15 are compressed and liquefied, wherein the raw gas outlet connection gas cooler 2 of gasification furnace 1 enters
Mouthful, the entrance of the outlet connection dust removing units 3 of gas cooler 2 and the entrance of waste heat boiler 6, the outlet connection of dust removing units 3
The outlet connection sulphur carbon of the entrance of desulfurization unit 4 and the entrance of sulphur-resistant conversion unit 10, sulphur-resistant conversion unit 10 takes off unit 11 altogether
Entrance, sulphur carbon altogether take off unit 11 outlet connection methanation unit 13 unstripped gas entrance, the synthesis day of methanation unit 13
Right gas outlet connection compresses and liquefies the entrance, the entrance of natural gas storage tank 15 and the entrance of natural gas line of unit 14；
The fuel gas entrance of the outlet connection gas turbine 5 of desulfurization unit 4 and the entrance of sulfur recovery unit 9, sulfur recovery list
The entrance of member 9 is also connected with the outlet of sulphur carbon separative unit 12, and the entrance connection sulphur carbon of sulphur carbon separative unit 12 takes off unit 11 altogether
Carbon dioxide is discharged in outlet, the outlet of sulphur carbon separative unit 12, and sulphur is discharged in sulfur recovery unit 9；
The oxygen intake of the oxygen outlet connection gasification furnace 1 of cryogenic air separation unit system 8, the nitrogen outlet of cryogenic air separation unit system 8
Connect the fuel gas entrance of gas turbine 5；The entrance of the outlet connection waste heat boiler 6 of gas turbine 5, the outlet of waste heat boiler 6
Connect the entrance of steam turbine 7；
The entrance of the outlet connection gas turbine 5 of natural gas storage tank 15.
The system flow are as follows:
Raw coal becomes dry pulverized coal after pretreatment and is sent into gasification furnace 1, raw material of one middle pressure steam as gasification reaction
It is sent into gasification furnace 1 simultaneously, the industrial pure oxygen that dry pulverized coal generates in gasification furnace 1 with middle pressure steam and cryogenic air separation unit system 8 is sent out
Raw gasification reaction, generates raw gas, and the lime-ash that gasification generates is excluded from gasification furnace 1；
Raw gas is cooled in gas cooler 2, while generating saturated vapor, which is sent to waste heat boiler
6 continue the feeding power generation of steam turbine 7 after overheat；
Cooling raw gas can be sent to power generation part or chemical industry synthesis part respectively after dust removing units 3, wherein
When being sent to generator unit, the raw gas after cooling and dedusting is using desulfurization unit 4, the sour gas of sweetening process generation
Body is sent into sulfur recovery unit 9 and generates sulphur, and the clean gas that sweetening process generates is sent into the acting hair of gas turbine 5 as fuel gas
Electricity, the high-temperature flue gas that gas turbine 5 generates are sent into waste heat boiler 6, and the steam that waste heat boiler 6 generates is sent into steam turbine 7 and generates electricity.
When being sent to chemical industry synthesis part, after sulphur-resistant conversion unit 10, CO largely turns the raw gas after cooling and dedusting
It is changed to CO2With H2, take off unit 11 altogether using sulphur carbon and remove H2The main sour gas such as S and a part of CO2, the gas of removing send
Enter sulphur carbon separative unit 12, the isolated H of sulphur carbon separative unit 122The main sour gas such as S is sent into sulfur recovery unit 9 and generates sulphur
Sulphur, the isolated CO of sulphur carbon separative unit 122It can empty, also can be used as product and send outside；
Coal gas body after over cure carbon takes off unit 11 altogether is sent into methanation unit 13 as unstripped gas, generates synthetic natural gas
After can be sent into natural gas line and natural gas storage tank 15, can also be sent into compress and liquefy unit 14 generate liquefied natural gas.Natural gas
Natural gas in storage tank 15 can be used as the fuel gas when starting of gas turbine 5 or underload.
Cryogenic air separation unit system 8 is produced industrial pure oxygen and is used for gasification furnace 1, and remaining dirt nitrogen injects fuel after pressurization may be selected
After gas, it is sent into acting power generation in gas turbine 5.
Claims (8)
1. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas, which is characterized in that including gasification furnace (1), coal
Gas Cooler (2), desulfurization unit (4), gas turbine (5), waste heat boiler (6), steam turbine (7), sulfur recovery unit (9), sulphur carbon
Unit (11), sulphur carbon separative unit (12), methanation unit (13) and natural gas storage tank (15) are taken off altogether, wherein gasification furnace (1)
The entrance of raw gas outlet connection gas cooler (2), the entrance of outlet connection preboiler (6) of gas cooler (2), in advance
The entrance of outlet connection steam turbine (7) of heat boiler (6)；
The entrance and sulphur carbon of outlet connection desulfurization unit (4) of gas cooler (2) take off the entrance of unit (11) altogether, wherein de-
The fuel gas entrance of clean gas outlet connection gas turbine (5) of sulphur unit (4), the sour gas outlet of desulfurization unit (4)
Connect the entrance of sulfur recovery unit (9)；
Sulphur carbon takes off the unstripped gas entrance of gas exit connection methanation unit (13) of unit (11) altogether, methanation unit (13)
The outlet of the entrance of synthetic natural gas outlet connection natural gas storage tank (15), natural gas storage tank (15) connects gas turbine (5)；
Sulphur carbon takes off the entrance of gas vent connection sulphur carbon separative unit (12) of unit (11), the acid of sulphur carbon separative unit (12) altogether
Property gas vent connection sulfur recovery unit (9) entrance.
2. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas according to claim 1, feature exist
In further including cryogenic air separation unit system (8), the oxygen intake of oxygen outlet connection gasification furnace (1) of cryogenic air separation unit system (8) is deep
The fuel gas entrance of nitrogen outlet connection gas turbine (5) of cold space division system (8).
3. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas according to claim 1, feature exist
In the outlet of gas cooler (2) is connected with dust removing units (3), wherein the outlet of dust removing units (3) connects desulfurization unit (4)
Entrance and sulphur carbon altogether take off unit (11) entrance.
4. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas according to claim 1, feature exist
In the entrance that sulphur carbon takes off unit (11) altogether is connected with sulphur-resistant conversion unit (10).
5. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas according to claim 1, feature exist
In gasification furnace (1) is provided with slag-drip opening.
6. a kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas according to claim 1, feature exist
In the outlet of methanation unit (13) is connected with the entrance and natural gas line for compressing and liquefying unit (14).
7. a kind of dry coal powder gasification IGCC method of co-production of synthetic natural gas, which is characterized in that based on any in claim 1-6
A kind of dry coal powder gasification IGCC power plant of co-production of synthetic natural gas described in, comprising the following steps:
Raw coal becomes dry pulverized coal after pretreatment and is sent into gasification furnace (1), meanwhile, using middle pressure steam as the raw material of gasification reaction
It is sent into gasification furnace (1) simultaneously, dry pulverized coal occurs in gasification furnace (1) with middle pressure steam and the pure oxygen being sent into gasification furnace (1)
Gasification reaction generates raw gas；
Raw gas is cooled in gas cooler (2), while generating saturated vapor, which is sent to waste heat boiler
(6) steam turbine (7) power generation is sent into after continuing overheat；
Cooling raw gas is sent to power generation part or chemical industry synthesis part, wherein
When being sent to power generation part, raw gas after cooling carries out desulfurization by desulfurization unit (4), wherein sweetening process generates
Sour gas be sent into sulfur recovery unit (9) generate sulphur, sweetening process generate clean gas as fuel gas feeding combustion gas
Turbine (5) acting power generation, the high-temperature flue gas that gas turbine (5) generates are sent into waste heat boiler (6), the steaming that waste heat boiler (6) generates
Vapour is sent into steam turbine (7) power generation；
When being sent to chemical industry synthesis part, the raw gas after cooling and dedusting passes through takes off unit (11) removing H through over cure carbon altogether2S sour gas
Body and a part of CO2, gas feeding sulphur carbon separative unit (12) of removing, the H of sulphur carbon separative unit (12) separation2S sour gas
It is sent into sulfur recovery unit (9) and generates sulphur, the CO of sulphur carbon separative unit (12) separation2It is emptied；
Coal gas body after over cure carbon takes off unit (11) altogether is sent into methanation unit (13) as unstripped gas, generates synthetic natural gas
After can be sent into natural gas storage tank (15), the natural gas in natural gas storage tank (15) starts as gas turbine (5) or when underload
Fuel gas.
8. a kind of dry coal powder gasification IGCC method of co-production of synthetic natural gas according to claim 7, which is characterized in that gas
The oxygen intake for changing furnace (1) is connected with the oxygen outlet of cryogenic air separation unit system (8), and the nitrogen outlet of cryogenic air separation unit system (8) adds
After injecting fuel gas after pressure, it is sent into acting power generation in gas turbine (5).
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