CN113606869A - Air separation system for IGCC, IGCC and control method for IGCC - Google Patents

Air separation system for IGCC, IGCC and control method for IGCC Download PDF

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Publication number
CN113606869A
CN113606869A CN202110962964.4A CN202110962964A CN113606869A CN 113606869 A CN113606869 A CN 113606869A CN 202110962964 A CN202110962964 A CN 202110962964A CN 113606869 A CN113606869 A CN 113606869A
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nitrogen
oxygen
inlet
storage tank
storage unit
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CN202110962964.4A
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Chinese (zh)
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史玉恒
宋晓玮
马耀飞
高磊
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China United Heavy Gas Turbine Technology Co Ltd
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China United Heavy Gas Turbine Technology Co Ltd
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Priority to CN202110962964.4A priority Critical patent/CN113606869A/en
Publication of CN113606869A publication Critical patent/CN113606869A/en
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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]
    • 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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    • 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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    • F25J3/04024—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of purified feed air, so-called boosted air
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    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
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    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
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    • F25J3/04109—Arrangements of compressors and /or their drivers
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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
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    • 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
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    • 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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    • 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
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    • F25J2210/40—Air or oxygen enriched air, i.e. generally less than 30mol% of O2
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    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
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    • F25J2240/10—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream the fluid being air
    • 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]

Abstract

The invention relates to an air separation system for IGCC, IGCC and a control method of IGCC. The air separation system comprises an air pretreatment unit, an oxygen generation unit, an oxygen storage unit, a nitrogen storage unit and a product gas treatment unit, wherein the air pretreatment unit is provided with an air inlet before treatment and an air outlet after treatment, the rectifying tower is provided with an air inlet after treatment, an oxygen outlet and a nitrogen outlet, the air inlet after treatment is connected with the air outlet after treatment, the oxygen storage unit and the nitrogen storage unit respectively comprise an oxygen storage tank and a nitrogen storage tank, the oxygen storage tank is provided with an oxygen storage tank inlet and an oxygen storage tank outlet, the nitrogen storage tank is provided with a nitrogen storage tank inlet and a nitrogen storage tank outlet, and the product gas treatment unit comprises an oxygen compressor and a nitrogen compressor.

Description

Air separation system for IGCC, IGCC and control method for IGCC
Technical Field
The invention relates to the technical field of IGCC power generation, in particular to an air separation system for an IGCC, the IGCC and a control method of 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 according to the embodiment of the invention comprises:
an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet;
the oxygen generation unit comprises a rectifying tower, the rectifying tower is provided with a processed air inlet, an oxygen outlet and a nitrogen outlet, and the processed air inlet is connected with the processed air 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
gaseous processing unit of product, gaseous processing unit of product 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 the oxygen pipeline, be equipped with the oxygen governing valve on the 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 the nitrogen pipeline, be equipped with the nitrogen governing valve on the 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.
In some embodiments, the oxygen storage unit comprises a liquid oxygen storage unit and a gaseous oxygen storage unit, the oxygen storage tank inlet of the liquid oxygen storage unit is connected with the oxygen outlet, the oxygen storage tank outlet of the liquid oxygen storage unit is connected with the oxygen storage tank inlet of the gaseous oxygen storage unit, and the oxygen storage tank outlet of the gaseous oxygen storage unit is connected with the oxygen inlet before compression.
In some embodiments, the air separation system further comprises a heat exchanger, the heat exchanger has a heated gas inlet, a heated gas outlet, a pre-heat-exchange oxygen inlet, and a post-heat-exchange oxygen inlet, the oxygen storage tank outlet of the liquid oxygen storage unit is connected to the pre-heat-exchange oxygen inlet, and the oxygen storage tank inlet of the gaseous oxygen storage unit is connected to the post-heat-exchange oxygen inlet.
In some embodiments, the air separation system further comprises a liquid oxygen pump, the liquid oxygen pump has a liquid oxygen pump inlet and a liquid oxygen pump outlet, the liquid oxygen pump inlet is connected to the oxygen storage tank outlet of the liquid oxygen storage unit, and the liquid oxygen pump outlet is connected to the oxygen inlet before heat exchange.
In some embodiments, the nitrogen storage unit comprises a liquid nitrogen storage unit and a gaseous nitrogen storage unit, the nitrogen storage tank inlet of the liquid nitrogen storage unit is connected with the nitrogen outlet, the nitrogen storage tank outlet of the liquid nitrogen storage unit is connected with the nitrogen storage tank inlet of the gaseous nitrogen storage unit, and the nitrogen storage tank inlet of the gaseous nitrogen storage unit is connected with the nitrogen inlet before compression.
In some embodiments, the air separation system further comprises a heat exchanger, the heat exchanger is provided with a heating gas inlet, a heating gas outlet, a nitrogen inlet before heat exchange and a nitrogen inlet after heat exchange, the nitrogen storage tank outlet of the liquid nitrogen storage unit is connected with the nitrogen inlet before heat exchange, and the nitrogen storage tank inlet of the gaseous nitrogen storage unit is connected with the nitrogen inlet after heat exchange.
In some embodiments, the air separation system further comprises a liquid nitrogen pump, wherein the liquid nitrogen pump is provided with a liquid nitrogen pump inlet and a liquid nitrogen pump outlet, the liquid nitrogen pump inlet is connected with the nitrogen storage tank outlet of the liquid nitrogen storage unit, and the liquid nitrogen pump outlet is connected with the nitrogen inlet before heat exchange.
In some embodiments, the treated air outlet is connected to the heated air inlet and the heated air outlet is connected to the treated air inlet.
The IGCC according to the embodiment of the invention comprises a gasification furnace, a gas turbine and an air separation system, wherein the air separation system is the air separation system according to the embodiment of the invention, the gasification furnace is provided with a gasification furnace inlet, the gas turbine is provided with a gas turbine inlet, the compressed oxygen outlet is connected with the gasification furnace inlet, and the compressed nitrogen outlet is connected with the gas turbine inlet.
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:
processing air into cooling air with the air pre-processing unit;
separating nitrogen and oxygen from the cooling air using a rectification column of 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 according to an embodiment of the present invention.
Fig. 2 is a schematic view of the structure of the heat exchanger of fig. 1.
Reference numerals:
an air separation system 1000;
an air pre-treatment unit 100;
an air compressor 1; a pre-treatment air inlet 101; a first cooler 2; a molecular sieve adsorber 3; a supercharger 4; a second cooler 5; an expander 6; a treated air outlet 601;
a heat exchanger 7; a heated gas inlet 701; a heated gas outlet 702; an oxygen inlet 703 before heat exchange; an oxygen inlet 704 after heat exchange; nitrogen inlet 705 before heat exchange; nitrogen inlet 706 after heat exchange;
an oxygen generation unit 200;
a rectifying column 8; a treated air inlet 801; an oxygen outlet 802; a nitrogen outlet 803;
a liquid oxygen storage unit 9; an inlet 901 of the oxygen storage tank; an oxygen storage tank outlet 902; a gaseous oxygen storage unit 10; an oxygen storage tank inlet 1001; an oxygen storage tank outlet 1002; a liquid nitrogen storage unit 11; nitrogen storage tank inlet 1101; nitrogen storage tank outlet 1102; a gaseous nitrogen storage unit 12; nitrogen storage tank inlet 1201; nitrogen storage tank outlet 1202; a liquid oxygen pump 13; a liquid oxygen pump inlet 131; a liquid oxygen pump outlet 132; a liquid nitrogen pump 14; a liquid nitrogen pump inlet 141; a liquid nitrogen pump outlet 142;
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 and 2, the IGCC according to the embodiment of the present invention includes a gasification furnace, a gas turbine, and an air separation system 1000. 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 air pre-treatment unit 100, an oxygen generation unit 200, an oxygen storage unit, a nitrogen storage unit, and a product gas treatment unit 300.
The air pre-treatment unit 100 has a pre-treatment air inlet and a post-treatment air outlet 601. The oxygen generation unit 200 comprises a rectifying tower 8, wherein the rectifying tower 8 is provided with a processed air inlet 801, an oxygen outlet 802 and a nitrogen outlet 803, and the processed air inlet 801 is connected with a processed air outlet 601.
The oxygen storage unit includes an oxygen storage tank having an oxygen storage tank inlet and an oxygen storage tank outlet, the oxygen storage tank inlet being connected to the oxygen outlet 802. The nitrogen gas storage unit includes nitrogen gas storage jar, and nitrogen gas storage jar has that nitrogen gas storage jar import and nitrogen gas storage jar export link to each other, and nitrogen gas storage jar import links to each other with nitrogen gas export 803.
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, the pre-compression oxygen inlet 151 and the oxygen storage tank outlet are connected by an oxygen pipeline, and an oxygen regulating valve is arranged on the oxygen pipeline. 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 are connected by a nitrogen pipeline, and a nitrogen regulating valve is arranged on the nitrogen pipeline.
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 oxygen pipeline comprises the following three conditions: in the first case, the oxygen pipeline comprises a first oxygen pipeline section and a second oxygen pipeline section, the first oxygen pipeline section is connected with an outlet of the oxygen storage tank, the second oxygen pipeline section is connected with an oxygen inlet 151 before compression, and the oxygen regulating valve is arranged between the first oxygen pipeline section and the second oxygen pipeline section; in the second case, the oxygen regulating valve is connected to the outlet of the oxygen storage tank, and the oxygen regulating valve is connected to the pre-compression oxygen inlet 151 through an oxygen pipe; in the third case, the oxygen regulating valve is connected to the pre-compression oxygen inlet 151, and the oxygen storage tank outlet and the oxygen regulating valve are connected via an oxygen line.
The nitrogen regulating valve arranged on the nitrogen pipeline comprises the following three conditions: in the first case, for example, the nitrogen gas line includes a first nitrogen gas line section connected to the outlet of the nitrogen gas storage tank and a second nitrogen gas line section connected to the nitrogen gas inlet 161 before compression, 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 regulating valve is connected with the outlet of the nitrogen storage tank, and the nitrogen regulating valve is connected with the nitrogen inlet 161 before compression through a nitrogen pipeline; in the third case, the nitrogen regulating valve is connected to the nitrogen inlet 161 before compression, and the outlet of the nitrogen storage tank and the nitrogen regulating valve are connected through a nitrogen pipe.
In operation of the air separation system 1000 according to an embodiment of the present invention, untreated air (pre-treated air) enters the air pretreatment unit 100 through the pre-treated air inlet, the air is treated by the air pretreatment unit 100 into cooled air, and the cooled air is discharged through the treated air outlet 601. The treated cooling air enters the rectifying tower 8 of the oxygen generation unit 200 through the air inlet 801, and oxygen and nitrogen are separated from the cooling air through the rectifying tower 8. The separated oxygen is discharged from the oxygen outlet 802 and enters the oxygen storage tank of the oxygen storage unit through the inlet of the oxygen storage tank; the separated nitrogen gas is discharged from the nitrogen outlet 803 and enters the nitrogen storage tank of the nitrogen storage unit through the nitrogen storage tank inlet. A part of oxygen enters the oxygen compressor 15 of the product gas processing unit 300 through the outlet of the oxygen storage tank and the oxygen inlet 151 before compression, 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 inlet of the gasification furnace; a portion of the nitrogen enters the nitrogen compressor 16 of the product gas processing unit 300 through the outlet of the nitrogen storage tank and the inlet 161 for nitrogen before compression, 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 inlet of the gas turbine.
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.
Therefore, when the load of the IGCC changes, the rectifying tower 8 of the air pretreatment unit 100 and the oxygen generation unit 200 does not need to be adjusted, or the rectifying tower 8 of the air pretreatment unit 100 and the oxygen generation unit 200 can be adjusted in a small range, so as to ensure the smooth operation of the rectifying tower 8.
It will be understood by those skilled in the art that when the IGCC load is greatly changed, the operation state of the rectification column 8 of the air pretreatment unit 100 and the oxygen generation unit 200 is not changed, that is, the amount of oxygen and nitrogen separated from the rectification column 8 is not changed; alternatively, when the operating states of the rectifying towers 8 of the air pretreatment unit 100 and the oxygen generation unit 200 are changed within a small range, that is, when the amounts of oxygen and nitrogen separated from the rectifying towers 8 are changed 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, when the IGCC is loaded up, the amount of oxygen in the oxygen storage tank gradually decreases (the amount of oxygen flowing out from the oxygen storage tank is larger than the amount of oxygen separated by the rectifying column 8), and the amount of nitrogen in the nitrogen storage tank also gradually decreases (the amount of nitrogen flowing out from the nitrogen storage tank is larger than the amount of nitrogen separated by the rectifying column 8). When the load of the IGCC is reduced, the amount of oxygen in the oxygen storage tank gradually increases (the amount of oxygen flowing out from the oxygen storage tank is smaller than the amount of oxygen separated by the rectifying tower 8), and the amount of nitrogen in the nitrogen storage tank also gradually increases (the amount of nitrogen flowing out from the nitrogen storage tank is smaller than the amount of nitrogen separated by the rectifying tower 8).
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 rectifying tower, 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 and closes the oxygen regulating valve of the oxygen storage unit and the nitrogen regulating valve of the nitrogen storage unit before starting the operation, so that oxygen is stored using the oxygen storage tank of the oxygen storage unit while nitrogen is stored using the nitrogen storage tank of the nitrogen storage unit.
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 is opened, so that pressurized oxygen is introduced into the gasification furnace through the gasification furnace inlet. And when the air subsystem 1000 is started for a second preset time, starting the gas turbine, and opening a nitrogen regulating valve of the nitrogen storage unit so that the pressurized oxygen is introduced into the gas turbine through an inlet of the gas turbine.
Therefore, before the IGCC is started, enough oxygen can be stored in the oxygen storage unit of the air separation system 1000, and enough nitrogen can be stored in the nitrogen storage unit 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.
In some embodiments, the air pretreatment unit 100 includes an air compressor 1, a first cooler 2, a molecular sieve adsorber 3, a booster 4, a second cooler 5, and an expander 6. The inlet of the air compressor 1 is used as a pre-treatment air inlet 101, air to be separated enters the air separation system 1000 through the pre-treatment air inlet 101, the outlet of the expansion machine 6 is used as a treated air outlet 601, and the treated air enters downstream equipment through the treated air outlet 601.
Therefore, air to be separated is firstly compressed by the air compressor 1 to obtain first compressed air, then the first compressed air is cooled by the first cooler 2 to obtain first cooling air, then the first cooling air is purified by the molecular sieve adsorber 3 to obtain purified air, then the purified air enters the supercharger 4 to be pressurized to obtain second compressed air, the second compressed air is cooled by the second cooler 5 to obtain second cooling air, and the second cooling air is expanded by the expander 6 to do work and cool to obtain cooling air.
In some embodiments, the oxygen storage units comprise a liquid oxygen storage unit 9 and a gaseous oxygen storage unit 10. An oxygen storage tank inlet 901 of the liquid oxygen storage unit 9 is connected with the oxygen outlet 802, an oxygen storage tank outlet 902 of the liquid oxygen storage unit 9 is connected with an oxygen storage tank inlet 1001 of the gaseous oxygen storage unit 10, and an oxygen storage tank outlet 1002 of the gaseous oxygen storage unit 10 is connected with the pre-compression oxygen inlet 151. In other words, the liquid oxygen storage unit 9 is disposed upstream of the gaseous oxygen storage unit 10.
For the situation that the oxygen separated from the rectifying tower 8 is in a liquid state and a gaseous state, the liquid oxygen storage unit 9 can be used for storing the liquid oxygen, and the gaseous oxygen storage unit 10 is used for storing the gaseous oxygen, so that the oxygen separated from the rectifying tower 8 can be conveniently stored. Specifically, the mixed oxygen (liquid oxygen and gaseous oxygen) separated by the rectifying tower 8 firstly enters the oxygen storage tank of the liquid oxygen storage unit 9 through the oxygen storage tank inlet 901 of the liquid oxygen storage unit 9, wherein the liquid oxygen in the mixed oxygen is stored in the oxygen storage tank of the liquid oxygen storage unit 9, and the gaseous oxygen in the mixed oxygen enters the oxygen storage tank of the gaseous oxygen storage unit 10 through the oxygen storage tank outlet 902 of the liquid oxygen storage unit 9 and the oxygen storage tank inlet 1001 of the gaseous oxygen storage unit 10 and is stored in the oxygen storage tank of the gaseous oxygen storage unit 10. Oxygen is supplied to the gasification furnace using the oxygen storage tank of the gaseous oxygen storage unit 10.
Compared with liquid oxygen, gaseous oxygen is easier to be utilized by the gasification furnace, therefore, the liquid oxygen storage unit 9 is arranged at the upstream of the gaseous oxygen storage unit 10, so that the gasification furnace utilizes the oxygen in the gaseous oxygen storage unit 10 firstly, when the load of the IGCC is changed, particularly when the load of the IGCC is increased, the oxygen regulating valve of the gaseous oxygen storage unit 10 can be regulated firstly, the load of the gasification furnace of the IGCC is matched quickly by the oxygen supply amount of the air separation system 1000, and the regulation flexibility of the IGCC is further improved.
It can be understood by those skilled in the art that when the gasification furnace of the IGCC is in operation, the oxygen in the oxygen storage tank of the gaseous oxygen storage unit 10 may be all introduced into the oxygen compressor 15 through the pre-compression oxygen inlet 151 and delivered to the gasification furnace, at this time, the oxygen in the oxygen storage tank of the gaseous oxygen storage unit 10 is stored in the oxygen storage tank of the gaseous oxygen storage unit 10, and it can be understood that the oxygen in the oxygen storage tank of the gaseous oxygen storage unit 10 is only stored in the oxygen storage tank of the gaseous oxygen storage unit 10 for a short time. Of course, the oxygen entering the oxygen storage tank of the gaseous oxygen storage unit 10 may also partially enter the oxygen compressor 15 through the pre-compression oxygen inlet 151 and be delivered to the gasification furnace, and partially be stored in the oxygen storage tank of the gaseous oxygen storage unit 10, at this time, the oxygen entering the oxygen compressor 15 through the pre-compression oxygen inlet 151 and being delivered to the gasification furnace may be understood as being temporarily stored in the oxygen storage tank of the gaseous oxygen storage unit 10. When the gasification furnace of the IGCC stops operating, all of the oxygen introduced into the oxygen storage tank of the gaseous oxygen storage unit 10 is stored in the oxygen storage tank of the gaseous oxygen storage unit 10.
Of course, in other embodiments, in the case that all the oxygen separated from the rectifying tower is gaseous oxygen, the oxygen storage unit only has a gaseous oxygen storage unit, and there is no need to provide a liquid oxygen storage unit, at this time, an oxygen storage tank inlet of the liquid oxygen storage unit is connected to the oxygen outlet, and an oxygen storage tank outlet of the gaseous oxygen storage unit is connected to the oxygen inlet before compression.
In other embodiments, for the case that all the oxygen separated from the rectifying tower is liquid oxygen, the oxygen storage unit only has a liquid oxygen storage unit, and a gaseous oxygen storage unit is not required to be arranged.
In some embodiments, the nitrogen storage unit includes a liquid nitrogen storage unit 11 and a gaseous nitrogen storage unit 12. A nitrogen storage tank inlet 1121 of the liquid nitrogen storage unit 11 is connected to the nitrogen outlet 803, a nitrogen storage tank outlet 1122 of the liquid nitrogen storage unit 11 is connected to a nitrogen storage tank inlet 1201 of the gaseous nitrogen storage unit 12, and a nitrogen storage tank outlet 1202 of the gaseous nitrogen storage unit 12 is connected to the pre-compression nitrogen inlet 151. In other words, the liquid nitrogen storage unit 11 is disposed upstream of the gaseous nitrogen storage unit 12.
For the condition that the nitrogen separated from the rectifying tower 8 has liquid and gaseous states, the liquid nitrogen storage unit 11 can be used for storing the liquid nitrogen, and the gaseous nitrogen storage unit 12 is used for storing the gaseous nitrogen, so that the nitrogen separated from the rectifying tower 8 can be conveniently stored. Specifically, the mixed nitrogen (liquid nitrogen and gaseous nitrogen) separated by the rectifying tower 8 firstly enters the nitrogen storage tank of the liquid nitrogen storage unit 11 through the nitrogen storage tank inlet 1121 of the liquid nitrogen storage unit 11, wherein the liquid nitrogen in the mixed nitrogen is stored in the nitrogen storage tank of the liquid nitrogen storage unit 11, and the gaseous nitrogen in the mixed nitrogen enters the nitrogen storage tank of the gaseous nitrogen storage unit 12 through the nitrogen storage tank outlet 1122 of the liquid nitrogen storage unit 11 and the nitrogen storage tank inlet 1201 of the gaseous nitrogen storage unit 12 and is stored in the nitrogen storage tank of the gaseous nitrogen storage unit 12. Nitrogen is provided to the gas turbine using the nitrogen storage tank of the gaseous nitrogen storage unit 12.
Compared with liquid nitrogen, gaseous nitrogen is easier to be used by the gas turbine, therefore, the liquid nitrogen storage unit 11 is arranged at the upstream of the gaseous nitrogen storage unit 12, so that the gas turbine firstly uses nitrogen in the gaseous nitrogen storage unit 12, when the load of the IGCC changes, especially when the load of the IGCC increases, the nitrogen regulating valve of the gaseous nitrogen storage unit 12 can be firstly regulated, the load of the gas turbine of the IGCC of the nitrogen supply amount of the air separation system 1000 is quickly matched, and the regulation flexibility of the IGCC is further improved.
It will be understood by those skilled in the art that, during operation of the IGCC gas turbine, the nitrogen gas entering the nitrogen storage tank of the gaseous nitrogen storage unit 12 may be all fed into the nitrogen compressor 15 through the pre-compression nitrogen inlet 151 and delivered to the gas turbine, and at this time, the nitrogen gas entering the nitrogen storage tank of the gaseous nitrogen storage unit 12 is stored in the nitrogen storage tank of the gaseous nitrogen storage unit 12, which may be understood as the nitrogen gas entering the nitrogen storage tank of the gaseous nitrogen storage unit 12 is only stored in the nitrogen storage tank of the gaseous nitrogen storage unit 12 for a short time. Of course, the nitrogen gas entering the nitrogen gas storage tank of the gaseous nitrogen gas storage unit 12 may also partially enter the nitrogen gas compressor 15 through the nitrogen gas inlet 151 before compression and be delivered to the gas turbine, and partially be stored in the nitrogen gas storage tank of the gaseous nitrogen gas storage unit 12, at this time, the nitrogen gas entering the nitrogen gas compressor 15 through the nitrogen gas inlet 151 before compression and be delivered to the part of the nitrogen gas of the gas turbine may be understood as being temporarily stored in the nitrogen gas storage tank of the gaseous nitrogen gas storage unit 12. When the gas turbine of the IGCC is stopped, the nitrogen gas introduced into the nitrogen storage tank of the gaseous nitrogen storage unit 12 is entirely stored in the nitrogen storage tank of the gaseous nitrogen storage unit 12.
Of course, in other embodiments, in the case that all the nitrogen separated from the rectifying tower is gaseous nitrogen, the nitrogen storage unit only has a gaseous nitrogen storage unit, and a liquid nitrogen storage unit is not required to be provided.
In other embodiments, for the case that all the nitrogen separated from the rectifying tower is liquid nitrogen, the nitrogen storage unit only has a liquid nitrogen storage unit, and a gaseous nitrogen storage unit is not required to be arranged.
In some embodiments, air separation system 1000 further includes heat exchanger 7. The heat exchanger 7 is provided with a heated gas inlet 701, a heated gas outlet 702, a pre-heat exchange oxygen inlet 703 and a post-heat exchange oxygen inlet 704, an oxygen storage tank outlet 902 of the liquid oxygen storage unit 9 is connected with the pre-heat exchange oxygen inlet, and an oxygen storage tank inlet 1001 of the gaseous oxygen storage unit is connected with the post-heat exchange oxygen inlet 704.
Liquid oxygen flowing out of an oxygen storage tank of the liquid oxygen storage unit 9 enters the heat exchanger 7 through the oxygen inlet 703 before heat exchange, heated gas enters the heat exchanger 7 through the heated gas inlet 701, and the liquid oxygen and the heated gas exchange heat in the heat exchanger to convert the liquid oxygen into gaseous oxygen and convert the heated gas into gas with lower temperature. So that more gaseous oxygen can be stored in the oxygen storage tank of the gaseous oxygen storage unit 10.
Therefore, when the load of the IGCC increases, the nitrogen regulating valve of the gaseous nitrogen storage unit 12 may be adjusted first, so that the load of the gas turbine of the IGCC of the nitrogen supply amount of the air separation system 1000 may be quickly matched, which is beneficial to further improve the flexibility of adjustment of the IGCC.
Preferably, the heating gas may be air.
Preferably, the treated air outlet 601 is connected to the heated air inlet 701 and the heated air outlet 702 is connected to the treated air inlet 801.
Therefore, the cooling air processed by the air preprocessing unit 100 enters the heat exchanger 7 as the heating gas, the liquid oxygen flowing out of the oxygen storage tank of the liquid oxygen storage unit 9 also enters the heat exchanger 7, the cooling air is further cooled by the liquid oxygen to obtain liquid air, and the liquid oxygen is heated by the cooling air to obtain gaseous oxygen. The heat and the cold of the air separation system 1000 are fully utilized, and the energy utilization rate is favorably improved.
In some embodiments, air separation system 1000 further includes a heat exchanger 7 in some embodiments. The heat exchanger 7 is provided with a heating gas inlet 701, a heating gas outlet 702, a nitrogen inlet 705 before heat exchange and a nitrogen inlet 706 after heat exchange, a nitrogen storage tank outlet 1122 of the liquid nitrogen storage unit 11 is connected with the nitrogen inlet before heat exchange, and a nitrogen storage tank inlet 1201 of the gaseous nitrogen storage unit is connected with the nitrogen inlet 706 after heat exchange.
Liquid nitrogen flowing out of a nitrogen storage tank of the liquid nitrogen storage unit 11 enters the heat exchanger 7 through the nitrogen inlet 705 before heat exchange, heated gas enters the heat exchanger 7 through the heated gas inlet 701, and the liquid nitrogen and the heated gas exchange heat in the heat exchanger to convert the liquid nitrogen into gaseous nitrogen and convert the heated gas into gas with lower temperature. So that more gaseous nitrogen can be stored in the nitrogen storage tank of the gaseous nitrogen storage unit 12.
Therefore, when the load of the IGCC increases, the nitrogen regulating valve of the gaseous nitrogen storage unit 12 may be adjusted first, so that the load of the gas turbine of the IGCC of the nitrogen supply amount of the air separation system 1000 may be quickly matched, which is beneficial to further improve the flexibility of adjustment of the IGCC.
Preferably, the heating gas may be air.
Preferably, the treated air outlet 601 is connected to the heated air inlet 701 and the heated air outlet 702 is connected to the treated air inlet 801.
Thus, the cooling air processed by the air preprocessing unit 100 enters the heat exchanger 7 as a heating gas, the liquid nitrogen flowing out of the nitrogen storage tank of the liquid nitrogen storage unit 11 also enters the heat exchanger 7, the cooling air is further cooled by the liquid nitrogen to obtain liquid air, and the liquid nitrogen is heated by the cooling air to obtain gaseous nitrogen. The heat and the cold of the air separation system 1000 are fully utilized, and the energy utilization rate is favorably improved.
In some embodiments, air separation system 1000 further includes a liquid oxygen pump 13. The liquid oxygen pump 13 has a liquid oxygen pump inlet 131 and a liquid oxygen pump outlet 132, the liquid oxygen pump inlet 131 is connected to an oxygen storage tank outlet 902 of the liquid oxygen storage unit 9, and the liquid oxygen pump outlet 132 is connected to the pre-heat exchange oxygen inlet 703.
Thereby, the liquid oxygen in the liquid oxygen storage unit 9 is conveniently transported to the heat exchanger 7 by the liquid oxygen pump 13.
In some embodiments, air separation system 1000 further comprises a liquid nitrogen pump 14, liquid nitrogen pump 14 having a liquid nitrogen pump inlet 141 and a liquid nitrogen pump outlet 142, liquid nitrogen pump inlet 141 being connected to a nitrogen storage tank outlet 1102 of liquid nitrogen storage unit 11, and liquid nitrogen pump outlet 142 being connected to a pre-heat exchange nitrogen inlet 705.
Thus, the liquid nitrogen in the liquid nitrogen storage unit 11 is conveniently delivered to the heat exchanger 7 by the liquid nitrogen pump 14.
The control method of the IGCC according to the embodiment of the invention comprises the following steps:
processing the air into cooling air using the air pre-processing unit 100;
separating oxygen and nitrogen from the cooling air using the rectification column 8 of 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, and store nitrogen by using the nitrogen storage tank stored in the nitrogen tank;
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 and 2:
the air separation system 1000 is started first. The air to be separated enters the air pre-treatment unit 100. The cooling air obtained after being processed by the air pre-processing unit 100 is discharged through the processed air outlet 601, and enters the heat exchanger 7 from the heated air inlet 701 to be cooled to obtain liquid air. After being processed, liquid air enters the rectifying tower 8 from the air inlet 801, nitrogen and oxygen are separated in the rectifying tower 8, the separated nitrogen flows out from the nitrogen outlet 803 and is stored in the oxygen storage unit, and the separated oxygen flows out from the oxygen outlet 802 and is stored in the nitrogen storage unit.
When the IGCC is started, oxygen is supplied to the gasification furnace by the oxygen storage unit, and nitrogen is supplied to the gas turbine by the nitrogen storage unit. When the load of the IGCC is changed, the oxygen regulating valve of the oxygen storage unit is adjusted to make the oxygen concentration of the gasification furnace matched with the load of the gasification furnace, and the nitrogen regulating valve of the nitrogen storage unit is adjusted to make the nitrogen concentration of the gas turbine matched with the load of the gas turbine.
Preferably, when the oxygen supply amount of the gasification furnace needs to be increased, the oxygen regulating valve of the gaseous oxygen storage unit 9 is adjusted to match the oxygen concentration of the gasification furnace with the load of the gasification furnace, and when the oxygen in the gaseous oxygen storage unit 9 is insufficient to match the oxygen concentration of the gasification furnace with the load of the gasification furnace, the oxygen regulating valve of the liquid oxygen storage unit 10 is adjusted to match the oxygen concentration of the gasification furnace with the load of the gasification furnace. When the nitrogen supply amount of the gas turbine needs to be increased, the nitrogen regulating valve of the gaseous nitrogen storage unit 11 is adjusted to match the nitrogen concentration of the gas turbine with the load of the gas turbine, and when the nitrogen in the gaseous nitrogen storage unit 11 is insufficient to match the nitrogen concentration of the gas turbine with the load of the gas turbine, the nitrogen regulating valve of the liquid nitrogen storage unit 12 is adjusted to match the nitrogen concentration of the gas turbine with 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 (11)

1. An air separation system for an IGCC, comprising:
an air pre-treatment unit having a pre-treatment air inlet and a post-treatment air outlet;
the oxygen generation unit comprises a rectifying tower, the rectifying tower is provided with a processed air inlet, an oxygen outlet and a nitrogen outlet, and the processed air inlet is connected with the processed air 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
gaseous processing unit of product, gaseous processing unit of product 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 the oxygen pipeline, be equipped with the oxygen governing valve on the 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 the nitrogen pipeline, be equipped with the nitrogen governing valve on the nitrogen pipeline.
2. The air separation system according to claim 1, wherein said oxygen storage unit includes a liquid oxygen storage unit and a gaseous oxygen storage unit, said oxygen storage tank inlet of said liquid oxygen storage unit is connected to said oxygen outlet, said oxygen storage tank outlet of said liquid oxygen storage unit is connected to said oxygen storage tank inlet of said gaseous oxygen storage unit, and said oxygen storage tank outlet of said gaseous oxygen storage unit is connected to said pre-compression oxygen inlet.
3. The air separation system according to claim 2, further comprising a heat exchanger having a heated gas inlet, a heated gas outlet, a pre-heat exchange oxygen inlet, and a post-heat exchange oxygen inlet, wherein the oxygen storage tank outlet of the liquid oxygen storage unit is connected to the pre-heat exchange oxygen inlet, and the oxygen storage tank inlet of the gaseous oxygen storage unit is connected to the post-heat exchange oxygen inlet.
4. The air separation system according to claim 3, further comprising a liquid oxygen pump having a liquid oxygen pump inlet and a liquid oxygen pump outlet, said liquid oxygen pump inlet being connected to said oxygen storage tank outlet of said liquid oxygen storage unit, said liquid oxygen pump outlet being connected to said pre-heat exchange oxygen inlet.
5. The air separation system according to claim 1, wherein the nitrogen storage unit includes a liquid nitrogen storage unit and a gaseous nitrogen storage unit, the nitrogen storage tank inlet of the liquid nitrogen storage unit is connected to the nitrogen outlet, the nitrogen storage tank outlet of the liquid nitrogen storage unit is connected to the nitrogen storage tank inlet of the gaseous nitrogen storage unit, and the nitrogen storage tank inlet of the gaseous nitrogen storage unit is connected to the pre-compression nitrogen inlet.
6. The air separation system according to claim 5, further comprising a heat exchanger having a heated gas inlet, a heated gas outlet, a pre-heat exchange nitrogen inlet, and a post-heat exchange nitrogen inlet, wherein the nitrogen storage tank outlet of the liquid nitrogen storage unit is connected to the pre-heat exchange nitrogen inlet, and the nitrogen storage tank inlet of the gaseous nitrogen storage unit is connected to the post-heat exchange nitrogen inlet.
7. The air separation system according to claim 6, further comprising a liquid nitrogen pump having a liquid nitrogen pump inlet and a liquid nitrogen pump outlet, wherein the liquid nitrogen pump inlet is connected to the nitrogen storage tank outlet of the liquid nitrogen storage unit, and the liquid nitrogen pump outlet is connected to the pre-heat exchange nitrogen inlet.
8. An air separation system according to claim 3 or 6, wherein the treated air outlet is connected to the heated air inlet and the heated air outlet is connected to the treated air inlet.
9. An IGCC comprising a gasifier, a gas turbine and an air separation system, the air separation system being according to any one of claims 1-8, the gasifier having a gasifier inlet, the gas turbine having a gas turbine inlet, wherein the compressed oxygen outlet is connected to the gasifier inlet, and the compressed nitrogen outlet is connected to the gas turbine inlet.
10. A control method of an IGCC according to claim 9, characterized by comprising the steps of:
processing air into cooling air with the air pre-processing unit;
separating nitrogen and oxygen from the cooling air using a rectification column of 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.
11. The control method according to claim 10, 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.
CN202110962964.4A 2021-08-20 2021-08-20 Air separation system for IGCC, IGCC and control method for IGCC Pending CN113606869A (en)

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JP2015151912A (en) * 2014-02-13 2015-08-24 三菱日立パワーシステムズ株式会社 Gas supply apparatus, power generation plant, and power generation plant control method
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US4608818A (en) * 1983-05-31 1986-09-02 Kraftwerk Union Aktiengesellschaft Medium-load power-generating plant with integrated coal gasification plant
US4682620A (en) * 1984-06-20 1987-07-28 Kraftwerk Union Aktiengesellschaft Clean-gas continuous-flow intermediate storage or accumulator plant
CN1155619A (en) * 1995-11-07 1997-07-30 气体产品与化学公司 Operation of integrated gasification combined cycle power generation systems at part load
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