WO2012074061A1 - Energy recovery device and coal gasification power generation plant - Google Patents

Energy recovery device and coal gasification power generation plant Download PDF

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Publication number
WO2012074061A1
WO2012074061A1 PCT/JP2011/077815 JP2011077815W WO2012074061A1 WO 2012074061 A1 WO2012074061 A1 WO 2012074061A1 JP 2011077815 W JP2011077815 W JP 2011077815W WO 2012074061 A1 WO2012074061 A1 WO 2012074061A1
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pressure
low
steam
pressure steam
gas
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PCT/JP2011/077815
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French (fr)
Japanese (ja)
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堤　孝則
太田　一広
貴 藤井
弘実 石井
小山　智規
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三菱重工業株式会社
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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
    • F02C3/26—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 solid or pulverulent, e.g. in slurry or suspension
    • F02C3/28—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 solid or pulverulent, e.g. in slurry or suspension using a separate gas producer for gasifying the fuel before combustion
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/005—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
    • C10K3/04—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment reducing the carbon monoxide content, e.g. water-gas shift [WGS]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/067—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification
    • F01K23/068—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification in combination with an oxygen producing plant, e.g. an air separation plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
    • C10J2300/1606—Combustion processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1643—Conversion of synthesis gas to energy
    • C10J2300/165—Conversion of synthesis gas to energy integrated with a gas turbine or gas motor
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1643—Conversion of synthesis gas to energy
    • C10J2300/1653—Conversion of synthesis gas to energy integrated in a gasification combined cycle [IGCC]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • C10J2300/1675—Integration of gasification processes with another plant or parts within the plant with the production of electricity making use of a steam turbine
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1678—Integration of gasification processes with another plant or parts within the plant with air separation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams
    • C10J2300/1892—Heat exchange between at least two process streams with one stream being water/steam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
    • 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
    • Y02E20/32—Direct CO2 mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Definitions

  • the present invention relates to an energy recovery device and a coal gasification power plant that effectively use condensed water from a regenerative superheater.
  • Patent Document 1 This integrated coal gasification combined cycle (IGCC) converts coal into combustible gas in a high-temperature and high-pressure gasification furnace, and uses the gasification gas as fuel for combined power generation using a gas turbine and a steam turbine.
  • IGCC integrated coal gasification combined cycle
  • reaction (1) has been advanced by sufficiently increasing the steam addition ratio (H 2 O / CO) at the CO shift reactor inlet.
  • the desired CO ⁇ CO 2 conversion rate can be obtained.
  • an IGCC plant equipped with a CO 2 recovery facility is a power plant, and it is necessary to give consideration to the environment (reduction of CO 2 emissions) and to emphasize plant power generation efficiency. That is, the reduction in the amount of steam extracted from the HRSG (exhaust heat recovery boiler) planned as the steam addition source for the steam addition ratio (H 2 O / CO) at the shift reactor inlet is improved from the plant efficiency, Since it is an important factor, it is required to reduce the medium-pressure steam from HRSG as much as possible from the viewpoint of increasing power generation efficiency.
  • HRSG exhaust heat recovery boiler
  • an object of the present invention is to provide an energy recovery device and a coal gasification power plant that can effectively use waste heat.
  • a first invention of the present invention for solving the above-mentioned problems is a heat exchanger for exchanging heat with low-pressure condensate from a regenerative superheater with feed water, and compression overheating the low-pressure steam heat-exchanged in the heat exchanger.
  • an energy recovery device including a compressor.
  • a second invention is a gasification furnace for gasifying coal to obtain a product gas, a purification means for purifying the product gas, a CO shift conversion device for converting CO in the purified product gas into CO 2 , CO 2 recovery device provided with CO 2 absorption tower for recovering CO 2 in CO shift gas and absorption liquid regeneration tower for regenerating absorption liquid, gas turbine equipment with combustor for burning purified gas, and gas turbine Exhaust heat recovery boiler (HRSG) that recovers the thermal energy of combustion exhaust gas from the facility, steam turbine equipment that generates power using steam recovered by the exhaust heat recovery boiler, and CO shift conversion of the extracted steam from the exhaust heat recovery boiler
  • HRSG gas turbine Exhaust heat recovery boiler
  • a compressor that obtains medium-pressure steam by compressing low-pressure steam heat-exchanged with the low-pressure drain of the reboiler for regeneration of the absorption liquid regeneration tower, and the obtained medium-pressure steam to the CO shift converter Serving In coal gasification power plant, characterized by comprising a supply line for.
  • the low-pressure condensed water is heat-exchanged to obtain medium-pressure steam, which is usable energy, so that it is supplied from the HRSG in the past by supplying it as reaction steam for the CO shift converter.
  • the supply amount of the extraction medium pressure steam can be reduced. As a result, the power generation efficiency is improved and the energy efficiency of the entire plant can be improved.
  • FIG. 1 is a schematic diagram of an energy recovery apparatus according to the first embodiment.
  • FIG. 2 is a diagram showing the relationship of energy use.
  • FIG. 3 is a schematic diagram of a coal gasification power plant including the energy recovery device according to the second embodiment.
  • FIG. 1 is a schematic diagram of an energy recovery apparatus according to the first embodiment.
  • the energy recovery apparatus 10 includes a heat exchanger 14 that exchanges heat between the low-pressure condensed water 12 from the regeneration superheater 11 and the feed water 13, and low-pressure steam 15 that is heat-exchanged in the heat exchanger 14.
  • a compressor 17 that obtains medium pressure steam 16 by compression overheating.
  • symbol 18 is spray water
  • 19 is a spray water mixing part
  • 20 is a water supply pump
  • 21 shows a saturated steam.
  • the energy recovery apparatus 10 exchanges the energy of the low-pressure condensed water 12 with the feed water 13 by exchanging heat of the low-pressure condensed water 12 heat-exchanged from the saturated steam 21 in the regeneration superheater 11 with the low-pressure steam. It has been converted to 15 energies. Since the energy of the low-pressure steam 15 is low in pressure and temperature, it cannot be used as it is in the CO shift converter. Therefore, the pressure is raised by the compressor 17 and the temperature is raised to obtain an intermediate pressure steam (product steam) 16 that can be used in the CO shift converter.
  • the pressure of the low-pressure condensed water 12 is 0.3 MPag and the temperature is 140 to 150 ° C.
  • the pressure is 0.2 MPag and the temperature is 120 ° C. by heat exchange with the feed water (normal pressure, 30 ° C.) 13.
  • the low-pressure condensate 12 decreases in temperature with the pressure unchanged (40 ° C.) and becomes low-temperature condensate 12A.
  • medium-pressure steam 16 having a pressure of 4.0 MPag and a temperature of 300 ° C. can be obtained.
  • FIG. 2 This energy utilization relationship is shown in FIG. As shown in FIG. 2, the energy of the low-pressure condensed water 12 is converted into the energy of the low-pressure steam 15.
  • the low-pressure steam 15 is boosted and heated by the compressor 17 to obtain boosted and heated energy.
  • the pressure is increased by the compressor 17, it is necessary to input power from the outside, so that there is an energy loss, but it is possible to extract more energy than the input power. That is, it is impossible to draw more power than the input power simply by boosting and heating the normal-pressure / normal-temperature water supply 13 with the compressor 17.
  • the low-pressure steam 15 obtained by heat exchange of the energy of the low-pressure condensed water 12 from the regenerative superheater 11 is compressed by the compressor 17, the energy of the fluid (water / steam) to be pressurized and heated is increased.
  • the compressor 17 can obtain usable energy that exceeds the power (energy) required for boosting overheating.
  • the spray water 18 is supplied to the intermediate pressure steam 16 obtained by the compressor 17 in the spray water mixing unit 19, but this is for adjusting the temperature of the intermediate pressure steam 16.
  • the supply amount of extraction intermediate pressure steam that has been conventionally supplied from HRSG can be reduced by supplying intermediate pressure steam 16 that is available energy as reaction steam of the CO shift converter. it can.
  • the power generation efficiency can be improved without reducing the conversion efficiency in the CO shift conversion device, and the energy efficiency of the entire plant can be improved.
  • the medium-pressure steam 16 that is the product steam can be used as a shift steam in a CO shift conversion device necessary for converting CO into CO 2 during H 2 production or CO 2 recovery.
  • HRSG exhaust heat recovery boiler
  • the obtained intermediate pressure steam 16 can be introduced into an intermediate pressure steam system of an exhaust heat recovery boiler (HRSG) and supplied to a steam turbine (ST).
  • the low-pressure condensed water from the regeneration superheater in the absorption liquid regeneration tower of the CO 2 recovery facility is used.
  • the present invention is not limited to this, and the IGCC facility or incidental or adjacent plant is used.
  • Low-pressure condensate from equipment that uses low-pressure steam in the equipment for example, a vacuum drainage heater, NH 3 stripping tower, heat exchanger that heats offgas on the downstream side of a deep electrostatic precipitator, etc.
  • the low-pressure condensate is discarded as it is, and when seawater or the like is used for heat exchange at the time of disposal, the temperature of the seawater has risen.
  • medium pressure steam can be obtained, and heat exchange in seawater is not necessary, so that the cause of seawater temperature rise is eliminated and an environmentally friendly plant system is provided. Can do.
  • FIG. 3 is a schematic diagram of a coal gasification power plant including the energy recovery device according to the second embodiment.
  • a coal gasification power plant 50 equipped with an energy recovery device includes a gasification furnace 53 that gasifies coal 51 to obtain a product gas 52, a purification means 54 that purifies the product gas 52, a CO shift converter 55 which converts the CO of cleaned in the generated gas 52 to CO 2, absorbent that has absorbed the CO 2 absorber 58A and CO 2 recovered by the absorbing liquid 57 to CO 2 in the CO shifted gas 56
  • a CO 2 recovery device 58 having an absorbing liquid regeneration tower 58B to be regenerated, a gas turbine facility 63 having a combustor 62 for combusting purified gas 61 from the CO 2 recovery device 58, and a combustion exhaust gas from the gas turbine facility 63
  • An exhaust heat recovery boiler (HRSG) 65 that recovers 64 thermal energy; a
  • reference numeral 80 denotes a desulfurization device for fixing S
  • 81 denotes an air separator for separating air into nitrogen and oxygen
  • 82 denotes a slag
  • 83 denotes a char.
  • the low-pressure condensed water 12 from the regeneration superheater 11 that superheats the absorption liquid in the absorption liquid regeneration tower 58B is heat-exchanged with the normal-pressure / normal-temperature water supply 13 and the heat exchanger 14, and the low-pressure steam obtained thereafter.
  • the obtained intermediate pressure steam 16 can be supplied to the CO shift converter 55.
  • the present invention heat recovery by an exothermic reaction can be effectively used, and a part of the extraction medium pressure steam 69 in the CO shift conversion device 55 can be supplemented. From the exhaust heat recovery boiler (HRSG) 65 Therefore, it is possible to reduce the supply amount of the extracted middle pressure steam 69, which contributes to the improvement of power generation efficiency.
  • the low-pressure condensate 12 has been heat-exchanged with seawater and then discharged into seawater. This heat is effectively utilized and heat exchange with seawater is not necessary. Therefore, an environment-friendly power plant system can be provided.

Abstract

An energy recovery device (10) comprises a heat exchanger (14) which carries out the heat exchange between low-pressure condensed water (12) supplied from a regenerative superheater (11) and supply water (13) and a compressor (17) which compresses and superheats low-pressure steam (15) that has been heat-exchanged by the heat exchanger (14) to generate medium-pressure steam (16), wherein, when the low-pressure condensed water (12) has a pressure of 0.3 MPag and a temperature of 140-150°C, the low-pressure condensed water (12) is heat-exchanged with the supply water (ambient pressure, 30°C) (13) to generate the low-pressure steam (15) having a pressure of 0.2 MPag and a temperature of 120˚C and the pressure and temperature of the low-pressure steam (15) are increased by the compressor (17) to generate the medium-pressure steam (16) having a pressure of 4.0 MPag and a temperature of 300°C.

Description

エネルギー回収装置及び石炭ガス化発電プラントEnergy recovery device and coal gasification power plant
　本発明は、再生過熱器からの凝縮水を有効利用するエネルギー回収装置及び石炭ガス化発電プラントに関する。 The present invention relates to an energy recovery device and a coal gasification power plant that effectively use condensed water from a regenerative superheater.
　石炭の有効利用は近年のエネルギー問題での切り札の一つとして注目されている。
　一方、石炭を付加価値の高いエネルギー媒体として、変換するためには石炭ガス化技術、ガス精製技術など高度な技術が必要とされる。
　このガス化ガスを用いて発電する石炭ガス化複合発電システムが提案されている（特許文献１）。
　この石炭ガス化複合発電（Ｉｎｔｅｇｒａｔｅｄ　ｃｏａｌ　Ｇａｓｉｆｉｃａｔｉｏｎ　Ｃｏｍｂｉｎｅｄ　Ｃｙｃｌｅ：ＩＧＣＣ）とは、石炭を高温高圧のガス化炉で可燃性ガスに転換し、そのガス化ガスを燃料としてガスタービンと蒸気タービンとによる複合発電を行うシステムをいう。 Effective use of coal has attracted attention as one of the trump cards in recent energy problems.
On the other hand, advanced technology such as coal gasification technology and gas purification technology is required to convert coal as an energy medium with high added value.
A coal gasification combined power generation system that generates power using this gasification gas has been proposed (Patent Document 1).
This integrated coal gasification combined cycle (IGCC) converts coal into combustible gas in a high-temperature and high-pressure gasification furnace, and uses the gasification gas as fuel for combined power generation using a gas turbine and a steam turbine. A system that performs
　石炭ガス化ガス（生成ガス）中に存在する炭化水素化合物は、殆どが一酸化炭素（ＣＯ）であり、二酸化炭素（ＣＯ2）、炭化水素（ＣＨ4、ＣnＨm）は数パーセントに過ぎない。
　この結果、ＣＯ2を回収するためには、生成ガス中に存在するＣＯをＣＯ2に転換する必要があり、水蒸気を添加しつつ、シフト触媒により下記反応によってＣＯ2に転換することが提案されている。
　ＣＯ＋Ｈ2Ｏ⇔　ＣＯ2＋Ｈ2＋４０．９ｋＪ／ｍｏｌ　　(発熱反応)　・・・（１） Most of the hydrocarbon compounds present in the coal gasification gas (product gas) are carbon monoxide (CO), and carbon dioxide (CO 2 ) and hydrocarbons (CH 4 , CnHm) are only a few percent.
As a result, in order to recover CO 2 , it is necessary to convert CO present in the product gas into CO 2 , and it is proposed to convert CO 2 into CO 2 by the following reaction using a shift catalyst while adding water vapor. ing.
CO + H 2 O⇔CO 2 + H 2 +40.9 kJ / mol (exothermic reaction) (1)
　これまで、化学工業分野でのシフト反応に対する知見より、ＣＯシフト反応器入口での水蒸気添加割合（Ｈ2Ｏ／ＣＯ）を十分に高くすることにより、上記（１）の反応を進めた上で、希望するＣＯ→ＣＯ2転換率を得ることが出来ることとなる。 Up to now, based on the knowledge of shift reaction in the chemical industry, the reaction (1) has been advanced by sufficiently increasing the steam addition ratio (H 2 O / CO) at the CO shift reactor inlet. The desired CO → CO 2 conversion rate can be obtained.
特開２００４－３３１７０１号公報Japanese Patent Laid-Open No. 2004-331701
　一方、ＣＯ2回収設備を備えたＩＧＣＣプラントは、発電プラントであり、環境（ＣＯ2排出量の低減）に配慮すると共に、プラント発電効率にも重点を置く必要がある。
　つまり、シフト反応器入口における水蒸気添加割合（Ｈ2Ｏ／ＣＯ）のための水蒸気添加源に計画されているＨＲＳＧ（排熱回収ボイラ）よりの抽気中圧蒸気量の低減がプラント効率向上より、重要な要素であるので、ＨＲＳＧからの中圧蒸気をなるべく減らすことが、発電効率上昇の点から求められている。 On the other hand, an IGCC plant equipped with a CO 2 recovery facility is a power plant, and it is necessary to give consideration to the environment (reduction of CO 2 emissions) and to emphasize plant power generation efficiency.
That is, the reduction in the amount of steam extracted from the HRSG (exhaust heat recovery boiler) planned as the steam addition source for the steam addition ratio (H 2 O / CO) at the shift reactor inlet is improved from the plant efficiency, Since it is an important factor, it is required to reduce the medium-pressure steam from HRSG as much as possible from the viewpoint of increasing power generation efficiency.
　本発明は、前記問題に鑑み、廃熱を有効利用することができるエネルギー回収装置及び石炭ガス化発電プラントを提供することを課題とする。 In view of the above problems, an object of the present invention is to provide an energy recovery device and a coal gasification power plant that can effectively use waste heat.
　上述した課題を解決するための本発明の第１の発明は、再生過熱器からの低圧凝縮水を給水と熱交換する熱交換器と、該熱交換器で熱交換された低圧蒸気を圧縮過熱する圧縮機とを備えたエネルギー回収装置にある。 A first invention of the present invention for solving the above-mentioned problems is a heat exchanger for exchanging heat with low-pressure condensate from a regenerative superheater with feed water, and compression overheating the low-pressure steam heat-exchanged in the heat exchanger. And an energy recovery device including a compressor.
　第２の発明は、石炭をガス化して生成ガスを得るガス化炉と、前記生成ガスを浄化する浄化手段と、浄化された生成ガス中のＣＯをＣＯ2に変換するＣＯシフト変換装置と、ＣＯシフトガス中のＣＯ2を回収するＣＯ2吸収塔と吸収液を再生する吸収液再生塔とを備えたＣＯ2回収装置と、精製ガスを燃焼する燃焼器を備えたガスタービン設備と、ガスタービン設備の燃焼排ガスの熱エネルギーを回収する排熱回収ボイラ（ＨＲＳＧ）と、排熱回収ボイラで回収した蒸気を用いて発電する蒸気タービン設備と、前記排熱回収ボイラからの抽気蒸気をＣＯシフト変換装置に供給する供給ラインと、吸収液再生塔の再生用リボイラの低圧ドレンと熱交換した低圧蒸気を圧縮し、中圧蒸気を得る圧縮機と、得られた中圧蒸気をＣＯシフト変換装置に供給する供給ラインとを具備することを特徴とする石炭ガス化発電プラントにある。 A second invention is a gasification furnace for gasifying coal to obtain a product gas, a purification means for purifying the product gas, a CO shift conversion device for converting CO in the purified product gas into CO 2 , CO 2 recovery device provided with CO 2 absorption tower for recovering CO 2 in CO shift gas and absorption liquid regeneration tower for regenerating absorption liquid, gas turbine equipment with combustor for burning purified gas, and gas turbine Exhaust heat recovery boiler (HRSG) that recovers the thermal energy of combustion exhaust gas from the facility, steam turbine equipment that generates power using steam recovered by the exhaust heat recovery boiler, and CO shift conversion of the extracted steam from the exhaust heat recovery boiler A compressor that obtains medium-pressure steam by compressing low-pressure steam heat-exchanged with the low-pressure drain of the reboiler for regeneration of the absorption liquid regeneration tower, and the obtained medium-pressure steam to the CO shift converter Serving In coal gasification power plant, characterized by comprising a supply line for.
　本発明によれば、低圧凝縮水を熱交換して、利用可能なエネルギーである中圧蒸気とすることで、ＣＯシフト変換装置の反応用蒸気として供給することにより、従来ＨＲＳＧから供給していた抽気中圧蒸気の供給量を低減することができる。この結果、発電効率が向上し、プラント全体のエネルギー効率を向上させることができる。 According to the present invention, the low-pressure condensed water is heat-exchanged to obtain medium-pressure steam, which is usable energy, so that it is supplied from the HRSG in the past by supplying it as reaction steam for the CO shift converter. The supply amount of the extraction medium pressure steam can be reduced. As a result, the power generation efficiency is improved and the energy efficiency of the entire plant can be improved.
図１は、実施例１に係るエネルギー回収装置の概略図である。FIG. 1 is a schematic diagram of an energy recovery apparatus according to the first embodiment. 図２は、エネルギー利用の関係を示す図である。FIG. 2 is a diagram showing the relationship of energy use. 図３は、実施例２に係るエネルギー回収装置を備えた石炭ガス化発電プラントの概略図である。FIG. 3 is a schematic diagram of a coal gasification power plant including the energy recovery device according to the second embodiment.
　以下、この発明につき図面を参照しつつ詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。また、下記実施例における構成要素には、当業者が容易に想定できるもの、あるいは実質的に同一のものが含まれる。 Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.
　本発明による実施例に係るエネルギー回収装置について、図面を参照して説明する。図１は、実施例１に係るエネルギー回収装置の概略図である。
　図１に示すように、エネルギー回収装置１０は、再生過熱器１１からの低圧凝縮水１２を給水１３と熱交換する熱交換器１４と、該熱交換器１４で熱交換された低圧蒸気１５を圧縮過熱して中圧蒸気１６を得る圧縮機１７とを備えるものである。
　ここで、図１中、符号１８はスプレイ水、１９はスプレイ水混合部、２０は給水ポンプ、２１は飽和蒸気を図示する。 An energy recovery apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an energy recovery apparatus according to the first embodiment.
As shown in FIG. 1, the energy recovery apparatus 10 includes a heat exchanger 14 that exchanges heat between the low-pressure condensed water 12 from the regeneration superheater 11 and the feed water 13, and low-pressure steam 15 that is heat-exchanged in the heat exchanger 14. And a compressor 17 that obtains medium pressure steam 16 by compression overheating.
Here, in FIG. 1, the code | symbol 18 is spray water, 19 is a spray water mixing part, 20 is a water supply pump, 21 shows a saturated steam.
　本実施例に係るエネルギー回収装置１０は、再生過熱器１１で飽和蒸気２１から熱交換された低圧凝縮水１２を給水１３と熱交換することで、低圧凝縮水１２が持っているエネルギーを低圧蒸気１５のエネルギーへ転換している。この低圧蒸気１５のエネルギーは圧力及び温度が低いので、そのままではＣＯシフト変換装置で利用することができない。
　そこで、圧縮機１７により昇圧すると共に昇温させることにより、ＣＯシフト変換装置で利用可能な中圧蒸気（製品蒸気）１６としている。 The energy recovery apparatus 10 according to the present embodiment exchanges the energy of the low-pressure condensed water 12 with the feed water 13 by exchanging heat of the low-pressure condensed water 12 heat-exchanged from the saturated steam 21 in the regeneration superheater 11 with the low-pressure steam. It has been converted to 15 energies. Since the energy of the low-pressure steam 15 is low in pressure and temperature, it cannot be used as it is in the CO shift converter.
Therefore, the pressure is raised by the compressor 17 and the temperature is raised to obtain an intermediate pressure steam (product steam) 16 that can be used in the CO shift converter.
　具体的には、例えば低圧凝縮水１２の圧力が０．３ＭＰａｇ、温度が１４０～１５０℃の場合、給水（常圧、３０℃）１３と熱交換させることで、圧力０．２ＭＰａｇ、温度１２０℃の低圧蒸気１５とすることができる。なお、低圧凝縮水１２は、圧力はそのままで温度が下がり（４０℃）、低温凝縮水１２Ａとなる。
　この低圧蒸気１５を圧縮機１７により昇圧昇温させることで、圧力４．０ＭＰａｇ、温度３００℃の中圧蒸気１６を得ることができる。 Specifically, for example, when the pressure of the low-pressure condensed water 12 is 0.3 MPag and the temperature is 140 to 150 ° C., the pressure is 0.2 MPag and the temperature is 120 ° C. by heat exchange with the feed water (normal pressure, 30 ° C.) 13. Of low pressure steam 15. The low-pressure condensate 12 decreases in temperature with the pressure unchanged (40 ° C.) and becomes low-temperature condensate 12A.
By raising the pressure of the low-pressure steam 15 by the compressor 17, medium-pressure steam 16 having a pressure of 4.0 MPag and a temperature of 300 ° C. can be obtained.
　これにより、低圧凝縮水１２の持つエネルギーを利用して熱回収して低圧蒸気１５を求め、これを圧縮機１７にて昇圧過熱し、必要とする圧力温度レベルの中圧蒸気１６を生成することができる。 Thus, heat is recovered by using the energy of the low-pressure condensed water 12 to obtain the low-pressure steam 15, and this is pressurized and superheated by the compressor 17 to generate the intermediate-pressure steam 16 at the required pressure temperature level. Can do.
　このエネルギー利用の関係を図２に示す。図２に示すように、低圧凝縮水１２が持つエネルギーは低圧蒸気１５が持つエネルギーに変換される。
　この低圧蒸気１５は圧縮機１７にて昇圧過熱することで、昇圧過熱したエネルギーを得ることとなる。
　なお、圧縮機１７で昇圧する際において、外部より動力を入力する必要があるのでエネルギーロスがあるものの、入力した動力以上にエネルギーを引き出すことが可能となる。
　つまり、常圧・常温の給水１３を単に圧縮機１７にて昇圧過熱しただけでは、入力した動力以上に動力を引き出すことは不可能である。 This energy utilization relationship is shown in FIG. As shown in FIG. 2, the energy of the low-pressure condensed water 12 is converted into the energy of the low-pressure steam 15.
The low-pressure steam 15 is boosted and heated by the compressor 17 to obtain boosted and heated energy.
In addition, when the pressure is increased by the compressor 17, it is necessary to input power from the outside, so that there is an energy loss, but it is possible to extract more energy than the input power.
That is, it is impossible to draw more power than the input power simply by boosting and heating the normal-pressure / normal-temperature water supply 13 with the compressor 17.
　これに対し、再生過熱器１１からの低圧凝縮水１２が持つエネルギーを熱交換した低圧蒸気１５を、圧縮機１７にて圧縮する場合には、昇圧加熱する流体(水／蒸気)のエネルギーを嵩上げし、圧縮機１７にて昇圧過熱に必要な動力(エネルギー)以上の利用可能なエネルギーを得ることが可能となる。
　なお、図１においては、圧縮機１７で得られた中圧蒸気１６にスプレイ水１８をスプレイ水混合部１９にて供給しているが、これは中圧蒸気１６の温度調節のためである。 On the other hand, when the low-pressure steam 15 obtained by heat exchange of the energy of the low-pressure condensed water 12 from the regenerative superheater 11 is compressed by the compressor 17, the energy of the fluid (water / steam) to be pressurized and heated is increased. In addition, the compressor 17 can obtain usable energy that exceeds the power (energy) required for boosting overheating.
In FIG. 1, the spray water 18 is supplied to the intermediate pressure steam 16 obtained by the compressor 17 in the spray water mixing unit 19, but this is for adjusting the temperature of the intermediate pressure steam 16.
　具体的には、利用可能なエネルギーである中圧蒸気１６を、ＣＯシフト変換装置の反応用蒸気として供給することにより、従来ＨＲＳＧから供給していた抽気中圧蒸気の供給量を低減することができる。この結果、ＣＯシフト変換装置での変換効率が低下することなく、発電効率が向上し、プラント全体のエネルギー効率を向上させることができる。 Specifically, the supply amount of extraction intermediate pressure steam that has been conventionally supplied from HRSG can be reduced by supplying intermediate pressure steam 16 that is available energy as reaction steam of the CO shift converter. it can. As a result, the power generation efficiency can be improved without reducing the conversion efficiency in the CO shift conversion device, and the energy efficiency of the entire plant can be improved.
　ここで、製品蒸気である中圧蒸気１６の使用先としては、Ｈ2製造またはＣＯ2回収時にＣＯをＣＯ2に転換するのに必要なＣＯシフト変換装置におけるシフト蒸気として利用できる。これにより、排熱回収ボイラ（ＨＲＳＧ）より供給される中圧抽気蒸気の低減を図ることができる。
　または、得られた中圧蒸気１６を排熱回収ボイラ（ＨＲＳＧ）の中圧蒸気系統に導入、スチームタービン（ＳＴ）に供給することも可能である。 Here, the medium-pressure steam 16 that is the product steam can be used as a shift steam in a CO shift conversion device necessary for converting CO into CO 2 during H 2 production or CO 2 recovery. Thereby, it is possible to reduce the medium-pressure extraction steam supplied from the exhaust heat recovery boiler (HRSG).
Alternatively, the obtained intermediate pressure steam 16 can be introduced into an intermediate pressure steam system of an exhaust heat recovery boiler (HRSG) and supplied to a steam turbine (ST).
　本実施例では、ＣＯ2回収設備の吸収液再生塔での再生過熱器からの低圧凝縮水を用いているが、本発明はこれに限定されるものではなく、ＩＧＣＣ設備又は付帯又は隣接するプラント設備における低圧蒸気を用いる設備（例えば減圧排水加熱器、ＮＨ3ストリッピング塔、深度電気集塵装置の後流側でオフガスを加熱する熱交換器等）からの低圧凝縮水を用いるようにしてもよい。 In this embodiment, the low-pressure condensed water from the regeneration superheater in the absorption liquid regeneration tower of the CO 2 recovery facility is used. However, the present invention is not limited to this, and the IGCC facility or incidental or adjacent plant is used. Low-pressure condensate from equipment that uses low-pressure steam in the equipment (for example, a vacuum drainage heater, NH 3 stripping tower, heat exchanger that heats offgas on the downstream side of a deep electrostatic precipitator, etc.) Good.
　このように、従来においては、低圧凝縮水はそのまま廃棄しており、その廃棄の際の熱交換で海水等を使用した場合には、海水の温度が上昇していたが、低圧凝縮水の熱エネルギーを有効利用することで、中圧蒸気を得ることができると共に、海水での熱交換が不要となるので、海水温度上昇の要因となることが解消され、環境にやさしいプラントシステムを提供することができる。 Thus, conventionally, the low-pressure condensate is discarded as it is, and when seawater or the like is used for heat exchange at the time of disposal, the temperature of the seawater has risen. By using energy efficiently, medium pressure steam can be obtained, and heat exchange in seawater is not necessary, so that the cause of seawater temperature rise is eliminated and an environmentally friendly plant system is provided. Can do.
　本発明による実施例に係るエネルギー回収装置を備えた石炭ガス化発電プラントについて、図面を参照して説明する。図３は、実施例２に係るエネルギー回収装置を備えた石炭ガス化発電プラントの概略図である。
　図３に示すように、エネルギー回収装置を備えた石炭ガス化発電プラント５０は、石炭５１をガス化して生成ガス５２を得るガス化炉５３と、前記生成ガス５２を浄化する浄化手段５４と、浄化された生成ガス５２中のＣＯをＣＯ2に変換するＣＯシフト変換装置５５と、ＣＯシフトガス５６中のＣＯ2を吸収液５７により回収するＣＯ2吸収塔５８ＡとＣＯ2を吸収した吸収液を再生する吸収液再生塔５８Ｂとを備えたＣＯ2回収装置５８と、ＣＯ2回収装置５８からの精製ガス６１を燃焼する燃焼器６２を備えたガスタービン設備６３と、ガスタービン設備６３の燃焼排ガス６４の熱エネルギーを回収する排熱回収ボイラ（ＨＲＳＧ）６５と、排熱回収ボイラ６５で回収した蒸気６６を用いて発電機６７を発電する蒸気タービン設備６８と、前記排熱回収ボイラ６５からの抽気中圧蒸気６９をＣＯシフト変換装置５５に供給する供給ライン７０と、吸収液再生塔５８Ｂの再生過熱器１１の低圧凝縮水１２と熱交換した低圧蒸気１５を圧縮し、中圧蒸気１６を得る圧縮機１７と、得られた中圧蒸気１６をＣＯシフト変換装置５５に供給する供給ライン７１とを具備するものである。
　図３中、符号８０はＳ分を固定する脱硫装置、８１は空気を窒素と酸素とに分離する空気分離器、８２はスラグ、８３はチャーを各々図示する。 A coal gasification power plant including an energy recovery device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a schematic diagram of a coal gasification power plant including the energy recovery device according to the second embodiment.
As shown in FIG. 3, a coal gasification power plant 50 equipped with an energy recovery device includes a gasification furnace 53 that gasifies coal 51 to obtain a product gas 52, a purification means 54 that purifies the product gas 52, a CO shift converter 55 which converts the CO of cleaned in the generated gas 52 to CO 2, absorbent that has absorbed the CO 2 absorber 58A and CO 2 recovered by the absorbing liquid 57 to CO 2 in the CO shifted gas 56 A CO 2 recovery device 58 having an absorbing liquid regeneration tower 58B to be regenerated, a gas turbine facility 63 having a combustor 62 for combusting purified gas 61 from the CO 2 recovery device 58, and a combustion exhaust gas from the gas turbine facility 63 An exhaust heat recovery boiler (HRSG) 65 that recovers 64 thermal energy; a steam turbine facility 68 that generates an electric generator 67 using the steam 66 recovered by the exhaust heat recovery boiler 65; The supply line 70 for supplying the extraction medium pressure steam 69 from the exhaust heat recovery boiler 65 to the CO shift converter 55 and the low pressure steam 15 heat-exchanged with the low pressure condensed water 12 of the regeneration superheater 11 of the absorption liquid regeneration tower 58B. The compressor 17 which compresses and obtains the intermediate pressure steam 16 and the supply line 71 which supplies the obtained intermediate pressure steam 16 to the CO shift converter 55 are provided.
In FIG. 3, reference numeral 80 denotes a desulfurization device for fixing S, 81 denotes an air separator for separating air into nitrogen and oxygen, 82 denotes a slag, and 83 denotes a char.
　本実施例では、吸収液再生塔５８Ｂにおいて吸収液を過熱させる再生過熱器１１からの低圧凝縮水１２を常圧・常温の給水１３と熱交換器１４で熱交換し、その後得られた低圧蒸気１５を、圧縮機１７にて圧縮することで、得られた中圧蒸気１６をＣＯシフト変換装置５５に供給することができる。 In this embodiment, the low-pressure condensed water 12 from the regeneration superheater 11 that superheats the absorption liquid in the absorption liquid regeneration tower 58B is heat-exchanged with the normal-pressure / normal-temperature water supply 13 and the heat exchanger 14, and the low-pressure steam obtained thereafter. By compressing 15 with the compressor 17, the obtained intermediate pressure steam 16 can be supplied to the CO shift converter 55.
　よって、ＣＯシフト変換装置５５の反応用蒸気として供給することにより、従来排熱回収ボイラ（ＨＲＳＧ）６５から供給していた抽気中圧蒸気６９の供給量の一部（約１５％）を補完することができ、その分抽気中圧蒸気６９の低減を図ることができる。この結果、発電効率が向上し、プラント全体のエネルギー効率を向上させることができる。 Therefore, by supplying it as the reaction steam of the CO shift converter 55, a part (about 15%) of the supply amount of the extraction intermediate pressure steam 69 supplied from the conventional exhaust heat recovery boiler (HRSG) 65 is complemented. Therefore, the extraction medium pressure steam 69 can be reduced accordingly. As a result, the power generation efficiency is improved and the energy efficiency of the entire plant can be improved.
　このように、本発明によれば、発熱反応による熱回収を有効に使い、ＣＯシフト変換装置５５における抽気中圧蒸気６９の一部を補完することができ、排熱回収ボイラ（ＨＲＳＧ）６５よりの抽気中圧蒸気６９の供給量の低減を図ることができ、発電効率の向上に寄与する。
　また、従来では、低圧凝縮水１２は海水で熱交換した後、海水に放流していたが、この熱を有効利用すると共に、海水での熱交換が不要となるので、海水温度上昇の要因となることが解消され、環境にやさしい発電プラントシステムを提供することができる。 As described above, according to the present invention, heat recovery by an exothermic reaction can be effectively used, and a part of the extraction medium pressure steam 69 in the CO shift conversion device 55 can be supplemented. From the exhaust heat recovery boiler (HRSG) 65 Therefore, it is possible to reduce the supply amount of the extracted middle pressure steam 69, which contributes to the improvement of power generation efficiency.
Conventionally, the low-pressure condensate 12 has been heat-exchanged with seawater and then discharged into seawater. This heat is effectively utilized and heat exchange with seawater is not necessary. Therefore, an environment-friendly power plant system can be provided.
　以上のように、本発明に係るエネルギー回収装置及び石炭ガス化発電プラントによれば、熱の有効利用を図り、発電効率の向上に寄与することができる。 As described above, according to the energy recovery device and the coal gasification power plant according to the present invention, it is possible to effectively use heat and contribute to the improvement of power generation efficiency.
　１０　エネルギー回収装置
　１１　再生過熱器
　１２　低圧凝縮水
　１３　給水
　１４　熱交換器
　１５　低圧蒸気
　１６　中圧蒸気
　１７　圧縮機 DESCRIPTION OF SYMBOLS 10 Energy recovery apparatus 11 Regenerative superheater 12 Low pressure condensed water 13 Feed water 14 Heat exchanger 15 Low pressure steam 16 Medium pressure steam 17 Compressor

Claims (2)

  1. 　再生過熱器からの低圧凝縮水を給水と熱交換する熱交換器と、
    　該熱交換器で熱交換された低圧蒸気を圧縮過熱する圧縮機とを備えたエネルギー回収装置。     A heat exchanger for exchanging heat between the low-pressure condensate from the regenerative superheater and the feed water;
    An energy recovery apparatus comprising: a compressor that compresses and superheats the low-pressure steam heat-exchanged by the heat exchanger.
  2. 　石炭をガス化して生成ガスを得るガス化炉と、
    　前記生成ガスを浄化する浄化手段と、
    　浄化された生成ガス中のＣＯをＣＯ2に変換するＣＯシフト変換装置と、
    　ＣＯシフトガス中のＣＯ2を回収するＣＯ2吸収塔と吸収液を再生する吸収液再生塔とを備えたＣＯ2回収装置と、
    　精製ガスを燃焼する燃焼器を備えたガスタービン設備と、
    　ガスタービン設備の燃焼排ガスの熱エネルギーを回収する排熱回収ボイラ（ＨＲＳＧ）と、
    　排熱回収ボイラで回収した蒸気を用いて発電する蒸気タービン設備と、
    　前記排熱回収ボイラからの抽気蒸気をＣＯシフト変換装置に供給する供給ラインと、
    　吸収液再生塔の再生用リボイラの低圧ドレンと熱交換した低圧蒸気を圧縮し、中圧蒸気を得る圧縮機と、
    　得られた中圧蒸気をＣＯシフト変換装置に供給する供給ラインとを具備することを特徴とする石炭ガス化発電プラント。     A gasification furnace that gasifies coal to obtain product gas;
    Purification means for purifying the product gas;
    A CO shift conversion device that converts CO in the purified product gas into CO 2 ;
    A CO 2 recovery device comprising a CO 2 absorption tower for recovering CO 2 in the CO shift gas and an absorption liquid regeneration tower for regenerating the absorption liquid;
    A gas turbine facility equipped with a combustor for burning purified gas;
    An exhaust heat recovery boiler (HRSG) for recovering the thermal energy of the combustion exhaust gas of the gas turbine equipment,
    Steam turbine equipment for generating electricity using steam recovered by an exhaust heat recovery boiler;
    A supply line for supplying extracted steam from the exhaust heat recovery boiler to a CO shift converter;
    A compressor for compressing the low-pressure steam heat-exchanged with the low-pressure drain of the reboiler for regeneration of the absorption liquid regeneration tower to obtain medium-pressure steam;
    A coal gasification power plant comprising: a supply line for supplying the obtained intermediate pressure steam to a CO shift converter.
PCT/JP2011/077815 2010-12-03 2011-12-01 Energy recovery device and coal gasification power generation plant WO2012074061A1 (en)

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JP2007061777A (en) * 2005-09-01 2007-03-15 Mitsubishi Heavy Ind Ltd Co2 recovery apparatus and co2 recovery method
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Publication number Priority date Publication date Assignee Title
JP2015013940A (en) * 2013-07-04 2015-01-22 一般財団法人電力中央研究所 Gas purification facility and coal gasification compound power generating unit

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