CN113606868A - IGCC, IGCC control method, and air separation system for IGCC - Google Patents
IGCC, IGCC control method, and air separation system for IGCC Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 619
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 366
- 239000001301 oxygen Substances 0.000 claims abstract description 364
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 364
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 283
- 238000003860 storage Methods 0.000 claims abstract description 161
- 239000007789 gas Substances 0.000 claims abstract description 154
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 53
- 238000007906 compression Methods 0.000 claims abstract description 47
- 230000006835 compression Effects 0.000 claims abstract description 44
- 230000008676 import Effects 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 18
- 239000012528 membrane Substances 0.000 claims description 73
- 230000001105 regulatory effect Effects 0.000 claims description 55
- 238000002309 gasification Methods 0.000 claims description 54
- 238000002203 pretreatment Methods 0.000 claims description 14
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 229910001882 dioxygen Inorganic materials 0.000 claims description 6
- 230000004044 response Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
- F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
- F25J3/04545—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
- F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/225—Multiple stage diffusion
- B01D53/226—Multiple stage diffusion in serial connexion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
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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
- F02C3/22—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 the fuel or oxidant being gaseous at standard temperature and pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
- F25J3/04575—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for a gas expansion plant, e.g. dilution of the combustion gas in a gas turbine
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D2053/221—Devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/42—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/50—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being oxygen
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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]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention relates to an IGCC, a control method of the IGCC and an air separation system for the IGCC. Air separation system is including making the oxygen unit, oxygen storage jar, nitrogen gas storage jar and product gas processing unit, it has air intlet to make the oxygen unit, oxygen export and nitrogen gas export, oxygen storage jar has oxygen storage jar import and oxygen storage jar export, nitrogen gas storage jar has nitrogen gas storage jar import and nitrogen gas storage jar export, product gas processing unit includes oxygen compressor and nitrogen compressor, oxygen compressor has oxygen import before the compression and the oxygen export after the compression, oxygen import and oxygen storage jar export link to each other through first oxygen pipeline before the compression, nitrogen compressor has nitrogen gas import before the compression and the nitrogen gas export after the compression, nitrogen gas import and nitrogen gas storage jar export link to each other through first nitrogen pipeline before the compression, all be equipped with the governing valve on first oxygen pipeline and the first nitrogen pipeline. The air separation system provided by the embodiment of the invention has the advantages of high running stability, short response time and the like.
Description
Technical Field
The invention relates to the technical field of IGCC power generation, in particular to an IGCC, a control method of the IGCC and an air separation system for the IGCC.
Background
The air separation system adopted by the existing IGCC has very high delay characteristic due to the limitation of speed and the time required for gas-liquid exchange to reach sufficient phase balance, the starting time is very long, the working condition adjusting time is also very long, and the flexibility of starting and variable working condition operation of the whole power station is limited to a great extent.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
for a core component double-layer rectifying tower, the gas flow speed in the rectifying tower is too low, namely uneven bubbling can occur when the gas flow speed is less than the critical speed, so that the nitrogen and oxygen separation is carried out in the local range of a tower plate, the nitrogen and oxygen separation is not thorough, and when the gas flow speed is too low, the liquid leaks from the tower plate because the gas cannot support the static pressure of a clear liquid layer, and the nitrogen and oxygen separation is further incomplete; when the airflow velocity in the rectifying tower is too high, a part of liquid with higher oxygen content is brought into the liquid with lower oxygen content and higher nitrogen content in the upper layer, so that the nitrogen and oxygen are not completely separated, and meanwhile, the liquid cannot smoothly flow downwards and is accumulated on a tower plate, which is not beneficial to the separation of the nitrogen and oxygen. Therefore, the oxygen production amount of the air separation system is limited by the flow rate, the rapid adjustment of the oxygen production amount cannot be realized simply by adjusting the air amount entering the air pretreatment unit, and the adjustment of the air separation system has a certain delay characteristic, so that the flexibility of the variable working condition operation of the IGCC is limited to a great extent. In addition, in the IGCC, the pressure of the air separation system is drastically reduced during the variable load operation, particularly during the low load operation, and the oxygen concentration of the gasification furnace is difficult to be stabilized around the design value, which affects the operation safety of the IGCC.
In addition, a certain time is required for gas-liquid exchange in the rectifying tower to reach sufficient balance, so that the maximum delay characteristic of the air separation system in the IGCC is caused, and the startup time of the IGCC is very long, about 3 days. In conclusion, the flexibility of starting and variable-operating IGCC is greatly restricted by the delay characteristic of the air separation system.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
For this reason, an embodiment of the present invention proposes an air separation system for an IGCC to solve the problem of poor operational flexibility of the air separation system.
Embodiments of the present invention provide an IGCC to solve the problem of poor operational flexibility of an air separation system.
The embodiment of the invention provides a control method of an IGCC (integrated gasification combined cycle), which aims to solve the problem of poor operation flexibility of an air separation system.
The air separation system for the IGCC according to the embodiment of the invention comprises:
an oxygen generation unit having an air inlet, an oxygen outlet, and a nitrogen outlet;
the oxygen storage unit comprises an oxygen storage tank, the oxygen storage tank is provided with an oxygen storage tank inlet and an oxygen storage tank outlet, the oxygen storage tank inlet is connected with the oxygen outlet, the nitrogen storage unit comprises a nitrogen storage tank, the nitrogen storage tank is provided with a nitrogen storage tank inlet and a nitrogen storage tank outlet, and the nitrogen storage tank inlet is connected with the nitrogen outlet; and
product gas processing unit, product gas processing unit includes oxygen compressor and nitrogen compressor, oxygen compressor has the oxygen import before the compression and the oxygen export after the compression, before the compression oxygen import with oxygen storage jar export links to each other through first oxygen pipeline, be equipped with the oxygen governing valve on the first oxygen pipeline, nitrogen compressor has nitrogen gas import before the compression and compression back nitrogen outlet, before the compression nitrogen gas import with nitrogen gas storage jar export links to each other through first nitrogen pipeline, be equipped with the nitrogen governing valve on the first nitrogen pipeline.
The air separation system for the IGCC has the advantages of high running stability, short response time and the like.
In some embodiments, the oxygen generation unit comprises a membrane separator to separate oxygen and nitrogen from air using a membrane separation process, each of the air inlet, the oxygen outlet, and the nitrogen outlet being disposed on the membrane separator.
In some embodiments, the membrane separator comprises a first membrane separator and a second membrane separator, the nitrogen outlet comprising a first nitrogen outlet and a second nitrogen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first nitrogen outlet, the second membrane separator having an intermediate gas inlet, the second nitrogen outlet and the oxygen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
In some embodiments, the membrane separator comprises a first membrane separator and a second membrane separator, the oxygen outlet comprising a first oxygen outlet and a second oxygen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first oxygen outlet, the second membrane separator having an intermediate gas inlet, the second oxygen outlet and the nitrogen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
In some embodiments, further comprising an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet, the air inlet being connected to the post-treatment air outlet.
An IGCC according to an embodiment of the invention includes:
an air separation system, comprising:
an oxygen generation unit having an air inlet, an oxygen outlet, and a nitrogen outlet,
oxygen storage unit and nitrogen gas storage unit, oxygen storage unit includes oxygen storage jar, oxygen storage jar has oxygen storage jar import and oxygen storage jar export, oxygen storage jar import with the oxygen export links to each other, nitrogen gas storage unit includes nitrogen gas storage jar, nitrogen gas storage jar has nitrogen gas storage jar import and nitrogen gas storage jar export, nitrogen gas storage jar import with the nitrogen gas export links to each other, and nitrogen gas storage jar import
The product gas treatment unit comprises an oxygen compressor and a nitrogen compressor, the oxygen compressor is provided with an oxygen inlet before compression and an oxygen outlet after compression, the oxygen inlet before compression is connected with the outlet of the oxygen storage tank through a first oxygen pipeline, an oxygen regulating valve is arranged on the first oxygen pipeline, the nitrogen compressor is provided with a nitrogen inlet before compression and a nitrogen outlet after compression, the nitrogen inlet before compression is connected with the outlet of the nitrogen storage tank through a first nitrogen pipeline, and the first nitrogen pipeline is provided with a nitrogen regulating valve;
the gasification furnace is provided with a gasification furnace inlet, and the compressed oxygen outlet is connected with the gasification furnace inlet; and
a gas turbine having a gas turbine inlet, the compressed nitrogen outlet being connected to the gas turbine inlet.
In some embodiments, the oxygen generation unit comprises a membrane separator to separate oxygen and nitrogen from air using a membrane separation process, each of the air inlet, the oxygen outlet, and the nitrogen outlet being disposed on the membrane separator.
In some embodiments, the membrane separator comprises a first membrane separator and a second membrane separator, the nitrogen outlet comprising a first nitrogen outlet and a second nitrogen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first nitrogen outlet, the second membrane separator having an intermediate gas inlet, the second nitrogen outlet and the oxygen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
In some embodiments, the membrane separator comprises a first membrane separator and a second membrane separator, the oxygen outlet comprising a first oxygen outlet and a second oxygen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first oxygen outlet, the second membrane separator having an intermediate gas inlet, the second oxygen outlet and the nitrogen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
In some embodiments, further comprising an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet, the air inlet being connected to the post-treatment air outlet.
The IGCC provided by the embodiment of the invention has the advantages of high operation flexibility and the like.
The control method of the IGCC according to the embodiment of the invention comprises the following steps:
separating oxygen and nitrogen from air using the oxygen generation unit;
storing the oxygen gas using the oxygen storage tank of the oxygen storage unit, and storing the nitrogen gas using the nitrogen tank of the nitrogen storage unit;
pressurizing the oxygen by using an oxygen compressor of the product gas processing unit so as to obtain pressurized oxygen, introducing the pressurized oxygen into the gasification furnace, pressurizing the nitrogen by using a nitrogen compressor of the product gas processing unit so as to obtain pressurized nitrogen, and introducing the pressurized nitrogen into the gas turbine;
when the load of the IGCC increases, increasing the opening degree of the oxygen regulating valve so as to provide more oxygen to the gasification furnace to make the concentration of the oxygen of the gasification furnace match with the load of the gasification furnace, and simultaneously increasing the opening degree of the nitrogen regulating valve so as to provide more nitrogen to the gas turbine to make the concentration of the nitrogen of the gas turbine match with the load of the gas turbine;
when the load of the IGCC is reduced, the opening degree of the oxygen regulating valve is reduced so as to provide less oxygen to the gasification furnace, so that the concentration of the oxygen of the gasification furnace matches the load of the gasification furnace, and the opening degree of the nitrogen regulating valve is reduced so as to provide less nitrogen to the gas turbine, so that the concentration of the nitrogen of the gas turbine matches the load of the gas turbine.
The IGCC control method has the advantages of high operation flexibility and the like.
In some embodiments, the control method further comprises the steps of:
firstly, opening the air separation system, and closing the oxygen regulating valve and the nitrogen regulating valve so as to store the oxygen by using the oxygen storage tank of the oxygen storage unit and store the nitrogen by using the nitrogen storage tank stored in the nitrogen tank;
and when the air separation system is started for a first preset time, the gasification furnace is started, the oxygen regulating valve is opened, and when the air separation system is started for a second preset time, the gas turbine is started, and the nitrogen regulating valve is opened.
Drawings
Fig. 1 is a schematic structural diagram of an air separation system for an IGCC according to an embodiment of the present invention.
Reference numerals:
an air separation system 1000;
an air pre-treatment unit 100;
a pre-treatment air inlet 1001; a treated air outlet 1002;
a filter 13; a filter inlet 131; a filter outlet 132; an adsorber 14; an adsorber inlet 141; an adsorber outlet 142;
an oxygen generation unit 200;
an air inlet 101; an oxygen outlet 102; a nitrogen outlet 103;
an oxygen storage unit 11; an oxygen storage tank inlet 111; an oxygen storage tank outlet 112;
a nitrogen gas storage unit 12; nitrogen storage tank inlet 121; nitrogen storage tank outlet 122;
a product gas processing unit 300;
an oxygen compressor 15; a pre-compression oxygen inlet 151; a post-compression oxygen outlet 152; a nitrogen compressor 16; a pre-compression nitrogen inlet 161; and a compressed nitrogen outlet 162.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, an IGCC according to an embodiment of the present invention includes an air separation system 1000, a gasification furnace, and a gas turbine. The gasifier has a gasifier inlet and the gas turbine has a gas turbine inlet.
An air separation system 1000 according to an embodiment of the present invention is described in detail below with reference to the drawings.
An air separation system 1000 according to an embodiment of the present invention includes an oxygen generation unit 200, an oxygen storage unit 11, a nitrogen storage unit 12, and a product gas processing unit 300.
The oxygen generation unit 200 has an air inlet 101, an oxygen outlet 102, and a nitrogen outlet 103.
The oxygen storage unit 11 comprises an oxygen storage tank having an oxygen storage tank inlet 111 and an oxygen storage tank outlet 112, the oxygen storage tank inlet 111 being connected to the oxygen outlet 102. The nitrogen storage unit 12 includes a nitrogen storage tank having a nitrogen storage tank inlet 121 connected to a nitrogen storage tank outlet 122, the nitrogen storage tank inlet 121 connected to a nitrogen outlet 103.
The product gas treatment unit 300 includes an oxygen compressor 15 and a nitrogen compressor 16. The oxygen compressor 15 has a pre-compression oxygen inlet 151 and a post-compression oxygen outlet 152, and the pre-compression oxygen inlet 151 and the oxygen storage tank outlet 112 are connected by a first oxygen pipe, and an oxygen regulating valve is provided on the first oxygen pipe. The nitrogen compressor 16 has a pre-compression nitrogen inlet 161 and a post-compression nitrogen outlet 162, the pre-compression nitrogen inlet 161 and the nitrogen storage tank outlet 122 are connected by a first nitrogen pipe, and a nitrogen regulating valve is disposed on the first nitrogen pipe.
Wherein, the compressed oxygen outlet 152 is connected with the inlet of the gasification furnace, and the compressed nitrogen outlet 162 is connected with the inlet of the gas turbine.
The oxygen regulating valve arranged on the first oxygen pipeline comprises the following three conditions: in the first case, the first oxygen pipeline comprises a first oxygen pipe section and a second oxygen pipe section, the first oxygen pipe section is connected with the outlet 112 of the oxygen storage tank, the second oxygen pipe section is connected with the inlet 151 of the oxygen before compression, and the oxygen regulating valve is arranged between the first oxygen pipe section and the second oxygen pipe section; in the second case, the oxygen regulating valve is connected to the outlet 112 of the oxygen storage tank, and the oxygen regulating valve is connected to the pre-compression oxygen inlet 151 via a first oxygen line; in the third case, the oxygen regulating valve is connected to the pre-compression oxygen inlet 151, and the oxygen storage tank outlet 112 and the oxygen regulating valve are connected via a first oxygen line.
The nitrogen regulating valve arranged on the first nitrogen pipeline comprises the following three conditions: in the first case, for example, the first nitrogen gas line includes a first nitrogen gas line section connected to the nitrogen gas storage tank outlet 122 and a second nitrogen gas line section connected to the pre-compression nitrogen gas inlet 161, and the nitrogen gas regulating valve is provided between the first nitrogen gas line section and the second nitrogen gas line section; in the second case, the nitrogen adjustment valve is connected to the nitrogen storage tank outlet 122, and the nitrogen adjustment valve and the pre-compression nitrogen inlet 161 are connected via a first nitrogen line; in the third case, the nitrogen adjustment valve is connected to the pre-compression nitrogen inlet 161, and the nitrogen storage tank outlet 122 and the nitrogen adjustment valve are connected through a first nitrogen line.
In operation of the air separation system 1000 according to an embodiment of the present invention, air enters the oxygen generation unit 200 through the air inlet 101, and oxygen and nitrogen are separated from the air by the oxygen generation unit 200. The separated oxygen is discharged from the oxygen outlet 102 and enters the oxygen storage tank of the oxygen storage unit 11 through the oxygen storage tank inlet 111; the separated nitrogen gas is discharged from the nitrogen gas outlet 103 and enters the nitrogen gas storage tank of the nitrogen gas storage unit 12 through the nitrogen gas storage tank inlet 121. A part of oxygen enters the oxygen compressor 15 of the product gas processing unit 300 through the oxygen storage tank outlet 112 and the pre-compression oxygen inlet 151, the oxygen compressor 15 of the product gas processing unit 300 is used for pressurizing the part of oxygen so as to obtain pressurized oxygen, and the pressurized oxygen is introduced into the gasification furnace through the gasification furnace inlet; a portion of the nitrogen enters the nitrogen compressor 16 of the product gas processing unit 300 through the nitrogen storage tank outlet 122 and the pre-compression nitrogen inlet 161, and is pressurized by the nitrogen compressor 16 of the product gas processing unit 300 to obtain pressurized nitrogen, and the pressurized oxygen is introduced into the gas turbine through the gas turbine inlet.
When the IGCC load changes, the loads of the gasification furnace and the gas turbine correspondingly change, and the loads of the gasification furnace and the gas turbine increase along with the increase of the IGCC load and decrease along with the decrease of the IGCC load. At this time, the oxygen concentration of the gasification furnace can be matched with the load of the gasification furnace and the nitrogen concentration of the gas turbine can be matched with the load of the gas turbine by adjusting the opening degrees of the oxygen regulating valve and the nitrogen regulating valve.
Specifically, when the load of the IGCC increases, the opening degree of the oxygen adjustment valve is increased, so that more oxygen can be supplied to the gasification furnace, and the concentration of oxygen in the gasification furnace can be matched with the load of the gasification furnace. Meanwhile, the opening degree of the nitrogen regulating valve is increased, so that more nitrogen can be provided for the gas turbine, and the concentration of the nitrogen of the gas turbine is matched with the load of the gas turbine. When the load of the IGCC is reduced, the opening degree of the oxygen regulating valve is reduced, so that less oxygen can be supplied like a gasification furnace, and the concentration of oxygen in the gasification furnace is matched with the load of the gasification furnace. Meanwhile, the opening degree of the nitrogen regulating valve is reduced, so that less nitrogen can be provided for the gas turbine, and the concentration of the nitrogen of the gas turbine is matched with the load of the gas turbine. Matching of the oxygen supply and the nitrogen supply of the air separation system 1000 with the load of the IGCC is achieved.
Thus, when the load of the IGCC changes, the oxygen generation unit 200 may not be adjusted, or only a small range of adjustment may be performed on the oxygen generation unit 200 to ensure smooth operation of the oxygen generation unit 200.
It will be understood by those skilled in the art that when the IGCC load is greatly changed, the operating state of the oxygen generation unit 200 is not changed, i.e., the amount of oxygen and nitrogen separated from the oxygen generation unit 200 is not changed; or, when the operating state of the oxygen generation unit 200 changes within a small range, that is, when the amount of oxygen and the amount of nitrogen separated by the oxygen generation unit 200 change within a small range. Because the amount of oxygen entering the gasification furnace and the amount of nitrogen entering the gas turbine are greatly changed, the amount of oxygen in the oxygen storage tank and the amount of nitrogen in the nitrogen storage tank are also greatly changed. For example, as the IGCC load increases, the amount of oxygen in the oxygen storage tank may gradually decrease (the amount of oxygen flowing out of the oxygen storage tank is greater than the amount of oxygen separated from the oxygen generation unit 200), while the amount of nitrogen in the nitrogen storage tank may gradually decrease (the amount of nitrogen flowing out of the nitrogen storage tank is greater than the amount of nitrogen separated from the oxygen generation unit 200). When the IGCC load decreases, the amount of oxygen in the oxygen storage tank gradually increases (the amount of oxygen flowing out of the oxygen storage tank is smaller than the amount of oxygen separated by the oxygen generation unit 200), and the amount of nitrogen in the nitrogen storage tank also gradually increases (the amount of nitrogen flowing out of the nitrogen storage tank is smaller than the amount of nitrogen separated by the oxygen generation unit 200).
In addition, the oxygen supply amount and the nitrogen supply amount of the air separation system 1000 can be quickly matched with the load of the IGCC by adjusting the oxygen regulating valve and the nitrogen regulating valve, and compared with the prior art that the oxygen supply amount and the nitrogen supply amount of the air separation system 1000 are matched with the load of the IGCC by adjusting the operation condition of the oxygen generating unit, the delay characteristic of the air separation system 1000 of the IGCC is changed, and the adjustment flexibility of the IGCC is improved.
The air separation system 1000 according to the embodiment of the invention has the advantages of high running stability, short response time and the like.
The IGCC provided by the embodiment of the invention has the advantages of high operation flexibility and the like of the air separation system.
In the related art, the startup time of the IGCC is long (about 3 days) due to the delay characteristic of the air separation system.
Preferably, the IGCC according to the embodiment of the present invention starts the air separation system 1000 before starting the operation, and closes the oxygen regulating valve of the oxygen storage unit 11 and the nitrogen regulating valve of the nitrogen storage unit 12, so that oxygen is stored using the oxygen storage tank of the oxygen storage unit 11, and nitrogen is stored using the nitrogen storage tank of the nitrogen storage unit 12 at the same time.
After the air separation system 1000 is started for a first preset time, the gasification furnace is started, and the oxygen regulating valve of the oxygen storage unit 11 is opened, so that pressurized oxygen is introduced into the gasification furnace through the gasification furnace inlet. After the air subsystem 1000 is turned on for a second preset time, the gas turbine is turned on, and the nitrogen regulating valve of the nitrogen storage unit 12 is opened, so that the pressurized oxygen is introduced into the gas turbine through the inlet of the gas turbine.
Therefore, before the IGCC is started, sufficient oxygen may be stored in the oxygen storage unit 11 of the air separation system 1000, and sufficient nitrogen may be stored in the nitrogen storage unit 12 of the air separation system 1000. At the time of starting the IGCC, the air separation system 1000 can provide enough oxygen to the gasifier when the gasifier is turned on, and the air separation system 1000 can provide enough nitrogen to the gas turbine when the gas turbine is turned on. Therefore, the IGCC can be started quickly, and the starting time of the IGCC is greatly shortened.
Alternatively, oxygen outlet 102 and oxygen storage tank inlet 111 are connected by a second oxygen line, and nitrogen outlet 103 and nitrogen storage tank inlet 121 are connected by a second nitrogen line.
In some embodiments, the oxygen generation unit 200 includes a membrane separator to separate oxygen and nitrogen from air using a membrane separation process. Each of the air inlet 101, the oxygen outlet 102 and the nitrogen outlet 103 is provided on the membrane separator.
Therefore, the IGCC provided by the embodiment of the invention utilizes the membrane separator to replace a rectifying tower in the related technology, namely, the membrane separation method is utilized to replace a cryogenic method in the related technology, the membrane separator directly separates oxygen and nitrogen by utilizing the difference of the permeability of oxygen and nitrogen in the air, the phase change process in the process of separating gas by the cryogenic method is reduced, compared with the cryogenic method, the process is simple, the construction and operation cost is low, the integral structure of the IGCC is facilitated to be simplified, and the operation cost of the IGCC is reduced.
In addition, the oxygen and the nitrogen which are separated by the membrane separator are in a gaseous form, so that the gaseous oxygen is more easily utilized by the gasification furnace, and meanwhile, the gaseous nitrogen is more easily utilized by the gas turbine. Therefore, by adjusting the oxygen regulating valve of the oxygen storage unit 11 and the nitrogen regulating valve of the nitrogen storage unit 12, the oxygen supply amount and the nitrogen supply amount of the air separation system 1000 can be matched with the load of the IGCC more quickly, which is beneficial to further improving the adjustment flexibility of the IGCC.
In some embodiments, the membrane separator comprises a first membrane separator having an air inlet 101, an intermediate gas outlet and a first nitrogen outlet, and a second membrane separator having an intermediate gas inlet, a second nitrogen outlet and an oxygen outlet 102, the intermediate gas outlet being connected to the intermediate gas inlet, the nitrogen outlet 103 comprising a first nitrogen outlet and a second nitrogen outlet.
Air firstly enters a first membrane separator through an air inlet 101, oxygen and nitrogen in the air are separated through the first membrane separator to obtain first oxygen-rich gas (oxygen) and first nitrogen-rich gas (nitrogen), the first oxygen-rich gas flows out from an intermediate gas outlet, and the first nitrogen-rich gas flows out from a first nitrogen outlet; then, the first oxygen-rich gas enters the second membrane separator through the intermediate gas inlet, oxygen and a small amount of nitrogen in the first oxygen-rich gas are separated through the second membrane separator to obtain a second oxygen-rich gas (oxygen) and a second nitrogen-rich gas (nitrogen), the second oxygen-rich gas flows out from the oxygen outlet 102, and the second nitrogen-rich gas flows out from the second nitrogen outlet. Wherein the second oxygen-rich gas enters the oxygen storage unit 11 and is stored, and each of the first nitrogen-rich gas and the second nitrogen-rich gas enters the nitrogen storage unit 12 and is stored.
Therefore, the purity of oxygen in the obtained second oxygen-enriched gas is high, and the efficiency of the IGCC is improved.
In some embodiments, the membrane separator comprises a first membrane separator having an air inlet, an intermediate gas outlet, and a first oxygen outlet, and a second membrane separator having an intermediate gas inlet, a second oxygen outlet, and a nitrogen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
Air firstly enters a first membrane separator through an air inlet 101, oxygen and nitrogen in the air are separated through the first membrane separator to obtain first oxygen-rich gas (oxygen) and first nitrogen-rich gas (nitrogen), the first nitrogen-rich gas flows out from an intermediate gas outlet, and the first oxygen-rich gas flows out from a first oxygen outlet; then, the first nitrogen-rich gas enters a second membrane separator through an intermediate gas inlet, nitrogen and a small amount of oxygen in the first nitrogen-rich gas are separated by the second membrane separator to obtain a second oxygen-rich gas (oxygen) and a second nitrogen-rich gas (nitrogen), the second nitrogen-rich gas flows out from a nitrogen outlet 103, and the second oxygen-rich gas flows out from a second oxygen outlet. Wherein each of the first oxygen-rich gas and the second oxygen-rich gas enters the oxygen storage unit 11 and is stored, and the second nitrogen-rich gas enters the nitrogen storage unit 12 and is stored.
Therefore, the purity of the nitrogen in the obtained second nitrogen-rich gas is high, and the efficiency of the IGCC is improved.
In some embodiments, air separation system 1000 further includes air pre-treatment unit 100, air pre-treatment unit 100 having a pre-treatment air inlet 1001 and a post-treatment air outlet 1002. The air inlet 101 is connected to a treated air outlet 1002.
For example, the air pretreatment unit 100 includes a filter 13 and an adsorber 14, the filter 13 having a filter inlet 131 and a filter outlet 132, and the adsorber 14 having an adsorber inlet 141 and an adsorber outlet 142. The filter inlet 131 forms a pre-process air inlet 1001 and the adsorber outlet 142 forms a post-process air outlet 1002.
Untreated air (air before treatment) enters the filter 13 through the air inlet 1001 before treatment (filter inlet 131), and the air before treatment is purified by the filter 13 and is treated into purified air; the purified air then exits through the filter outlet 132 and enters the adsorber 14 through the adsorber inlet 141, the air is dried by the adsorber 14 to remove water, the purified air is processed into dried air, and the dried air exits through the adsorber outlet 142 (processed air outlet 1002) and enters the oxygen generation unit 200 through the air inlet 101.
This makes the oxygen gas flowing out from the oxygen outlet 102 higher in purity and more easily usable in the gasification furnace, and the nitrogen gas flowing out from the nitrogen outlet 103 higher in purity and more easily usable in the gas turbine. Therefore, by adjusting the oxygen regulating valve of the oxygen storage unit 11 and the nitrogen regulating valve of the nitrogen storage unit 12, the oxygen supply amount and the nitrogen supply amount of the air separation system 1000 can be matched with the load of the IGCC more quickly, which is beneficial to further improving the adjustment flexibility of the IGCC.
The control method of the IGCC according to the embodiment of the invention comprises the following steps:
separating oxygen and nitrogen from air using the oxygen generation unit 200;
storing oxygen by using an oxygen storage tank of the oxygen storage unit, and storing nitrogen by using a nitrogen tank of the nitrogen storage unit;
pressurizing the oxygen gas by using the oxygen gas compressor 15 of the product gas processing unit 300 to obtain pressurized oxygen gas, and pressurizing the nitrogen gas by using the nitrogen gas compressor 16 of the product gas processing unit 300 to obtain pressurized nitrogen gas;
when the load of the IGCC increases, the opening degree of the oxygen regulating valve is increased so as to provide more oxygen to the gasification furnace, so that the concentration of the oxygen of the gasification furnace matches with the load of the gasification furnace, and the opening degree of the nitrogen regulating valve is increased so as to provide more nitrogen to the gas turbine, so that the concentration of the nitrogen of the gas turbine matches with the load of the gas turbine.
When the load of the IGCC is reduced, the opening degree of the oxygen regulating valve is reduced so as to provide less oxygen to the gasification furnace so that the concentration of the oxygen of the gasification furnace matches the load of the gasification furnace, and the opening degree of the nitrogen regulating valve is reduced so as to provide less nitrogen to the gas turbine so that the concentration of the nitrogen of the gas turbine matches the load of the gas turbine.
The control method of the IGCC has the advantages of high operation flexibility and the like.
Preferably, the air separation system 1000 is started first, and the oxygen regulating valve and the nitrogen regulating valve are closed, so as to store oxygen by using the oxygen storage tank of the oxygen storage unit 11, and store nitrogen by using the nitrogen storage tank stored by the nitrogen tank of the nitrogen storage unit 12;
and after the air distribution system is started for a first preset time, the gasification furnace is started, the oxygen regulating valve is opened, and after the air distribution system is started for a second preset time, the gas turbine is started, and the nitrogen regulating valve is opened.
The first preset time may be equal to the second preset time, and the first preset time may also be less than the second preset time.
The operation process of the air separation system of the IGCC according to the embodiment of the present invention is described in detail below with reference to fig. 1:
the air separation system 1000 is started first. The air to be separated enters the air pre-treatment unit 100. The dried air obtained after being processed by the air pre-processing unit 100 is discharged through the processed air outlet 1002, and the dried air enters the oxygen generation unit 200 through the air inlet 101. The oxygen generation unit 200 is used for separating nitrogen and oxygen from the dried air, the separated oxygen flows out from the oxygen outlet 102 and is stored in the nitrogen storage unit 11, and the separated nitrogen flows out from the nitrogen outlet 103 and is stored in the oxygen storage unit 12.
When the IGCC is started up, oxygen is supplied to the gasification furnace by the oxygen storage unit 11, and nitrogen is supplied to the gas turbine by the nitrogen storage unit 12. When the load of the IGCC changes, the oxygen regulating valve of the oxygen storage unit 11 is adjusted to match the oxygen concentration of the gasification furnace to the load of the gasification furnace, and the nitrogen regulating valve of the nitrogen storage unit 12 is adjusted to match the nitrogen concentration of the gas turbine to the load of the gas turbine.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through a middle chord medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first or second feature or indirectly contacting the first or second feature through a middle chord medium. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. An air separation system for an IGCC, comprising:
an oxygen generation unit having an air inlet, an oxygen outlet, and a nitrogen outlet;
the oxygen storage unit comprises an oxygen storage tank, the oxygen storage tank is provided with an oxygen storage tank inlet and an oxygen storage tank outlet, the oxygen storage tank inlet is connected with the oxygen outlet, the nitrogen storage unit comprises a nitrogen storage tank, the nitrogen storage tank is provided with a nitrogen storage tank inlet and a nitrogen storage tank outlet, and the nitrogen storage tank inlet is connected with the nitrogen outlet; and
product gas processing unit, product gas processing unit includes oxygen compressor and nitrogen compressor, oxygen compressor has the oxygen import before the compression and the oxygen export after the compression, before the compression oxygen import with oxygen storage jar export links to each other through first oxygen pipeline, be equipped with the oxygen governing valve on the first oxygen pipeline, nitrogen compressor has nitrogen gas import before the compression and compression back nitrogen outlet, before the compression nitrogen gas import with nitrogen gas storage jar export links to each other through first nitrogen pipeline, be equipped with the nitrogen governing valve on the first nitrogen pipeline.
2. The air separation system for IGCC of claim 1, wherein the oxygen generation unit comprises a membrane separator to separate oxygen and nitrogen in air using a membrane separation process, each of the air inlet, the oxygen outlet and the nitrogen outlet being disposed on the membrane separator.
3. The air separation system for IGCC of claim 2, wherein the membrane separator comprises a first membrane separator and a second membrane separator, the nitrogen outlet comprising a first nitrogen outlet and a second nitrogen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first nitrogen outlet, the second membrane separator having an intermediate gas inlet, the second nitrogen outlet and the oxygen outlet, the intermediate gas outlet connected to the intermediate gas inlet.
4. The air separation system for IGCC of claim 2, wherein said membrane separator comprises a first membrane separator and a second membrane separator, said oxygen outlet comprising a first oxygen outlet and a second oxygen outlet, said first membrane separator having said air inlet, an intermediate gas outlet and said first oxygen outlet, said second membrane separator having an intermediate gas inlet, said second oxygen outlet and said nitrogen outlet, said intermediate gas outlet connected to said intermediate gas inlet.
5. The air separation system for an IGCC according to any one of claims 1-4, further comprising an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet, said air inlet being connected to said post-treatment air outlet.
6. An IGCC, comprising:
an air separation system, comprising:
an oxygen generation unit having an air inlet, an oxygen outlet, and a nitrogen outlet,
oxygen storage unit and nitrogen gas storage unit, oxygen storage unit includes oxygen storage jar, oxygen storage jar has oxygen storage jar import and oxygen storage jar export, oxygen storage jar import with the oxygen export links to each other, nitrogen gas storage unit includes nitrogen gas storage jar, nitrogen gas storage jar has nitrogen gas storage jar import and nitrogen gas storage jar export, nitrogen gas storage jar import with the nitrogen gas export links to each other, and nitrogen gas storage jar import
The product gas treatment unit comprises an oxygen compressor and a nitrogen compressor, the oxygen compressor is provided with an oxygen inlet before compression and an oxygen outlet after compression, the oxygen inlet before compression is connected with the outlet of the oxygen storage tank through a first oxygen pipeline, an oxygen regulating valve is arranged on the first oxygen pipeline, the nitrogen compressor is provided with a nitrogen inlet before compression and a nitrogen outlet after compression, the nitrogen inlet before compression is connected with the outlet of the nitrogen storage tank through a first nitrogen pipeline, and the first nitrogen pipeline is provided with a nitrogen regulating valve;
the gasification furnace is provided with a gasification furnace inlet, and the compressed oxygen outlet is connected with the gasification furnace inlet; and
a gas turbine having a gas turbine inlet, the compressed nitrogen outlet being connected to the gas turbine inlet.
7. An IGCC according to claim 6 wherein the oxygen generation unit comprises a membrane separator for separating oxygen and nitrogen from air using a membrane separation process, each of the air inlet, the oxygen outlet and the nitrogen outlet being provided on the membrane separator.
8. An IGCC according to claim 7 wherein the membrane separator comprises a first membrane separator and a second membrane separator, the nitrogen outlet comprising a first nitrogen outlet and a second nitrogen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first nitrogen outlet, the second membrane separator having an intermediate gas inlet, the second nitrogen outlet and the oxygen outlet, the intermediate gas outlet being connected to the intermediate gas inlet.
9. An IGCC according to claim 7 wherein the membrane separator comprises a first membrane separator and a second membrane separator, the oxygen outlet comprising a first oxygen outlet and a second oxygen outlet, the first membrane separator having the air inlet, an intermediate gas outlet and the first oxygen outlet, the second membrane separator having an intermediate gas inlet, the second oxygen outlet and the nitrogen outlet, the intermediate gas outlet being connected to the intermediate gas inlet.
10. An IGCC according to any of claims 6-9 further comprising an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet, the air inlet being connected to the post-treatment air outlet.
11. A control method of an IGCC according to any of claims 6-10, characterized by comprising the steps of:
separating oxygen and nitrogen from air using the oxygen generation unit;
storing the oxygen gas using the oxygen storage tank of the oxygen storage unit, and storing the nitrogen gas using the nitrogen tank of the nitrogen storage unit;
pressurizing the oxygen by using an oxygen compressor of the product gas processing unit so as to obtain pressurized oxygen, introducing the pressurized oxygen into the gasification furnace, pressurizing the nitrogen by using a nitrogen compressor of the product gas processing unit so as to obtain pressurized nitrogen, and introducing the pressurized nitrogen into the gas turbine;
when the load of the IGCC increases, increasing the opening degree of the oxygen regulating valve so as to provide more oxygen to the gasification furnace to make the concentration of the oxygen of the gasification furnace match with the load of the gasification furnace, and simultaneously increasing the opening degree of the nitrogen regulating valve so as to provide more nitrogen to the gas turbine to make the concentration of the nitrogen of the gas turbine match with the load of the gas turbine;
when the load of the IGCC is reduced, the opening degree of the oxygen regulating valve is reduced so as to provide less oxygen to the gasification furnace, so that the concentration of the oxygen of the gasification furnace matches the load of the gasification furnace, and the opening degree of the nitrogen regulating valve is reduced so as to provide less nitrogen to the gas turbine, so that the concentration of the nitrogen of the gas turbine matches the load of the gas turbine.
12. The control method according to claim 11, characterized by further comprising the step of:
firstly, opening the air separation system, and closing the oxygen regulating valve and the nitrogen regulating valve so as to store the oxygen by using the oxygen storage tank of the oxygen storage unit and store the nitrogen by using the nitrogen storage tank stored in the nitrogen tank;
and when the air separation system is started for a first preset time, the gasification furnace is started, the oxygen regulating valve is opened, and when the air separation system is started for a second preset time, the gas turbine is started, and the nitrogen regulating valve is opened.
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| CN114060114A (en) * | 2021-11-23 | 2022-02-18 | 中国华能集团清洁能源技术研究院有限公司 | IGCC power station one-key start-stop control method |
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