CN105582794A - Solar geothermal energy CO2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system - Google Patents
Solar geothermal energy CO2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system Download PDFInfo
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- 238000005262 decarbonization Methods 0.000 title abstract description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 238000006477 desulfuration reaction Methods 0.000 abstract description 23
- 230000023556 desulfurization Effects 0.000 abstract description 23
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 abstract description 12
- 238000010248 power generation Methods 0.000 abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003546 flue gas Substances 0.000 abstract description 8
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 239000012717 electrostatic precipitator Substances 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 44
- 239000000243 solution Substances 0.000 description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 description 22
- 230000008929 regeneration Effects 0.000 description 10
- 238000011069 regeneration method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 239000002250 absorbent Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 5
- 238000003795 desorption Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明提供了一种实现燃煤机组的烟气减排的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统，包括燃煤发电系统、脱硝脱硫系统、单乙醇胺CO2吸收系统、太阳能与地热能辅助超临界CO2朗肯循环系统；所述燃煤发电系统包括依次连接的省煤器、锅炉、汽轮机、凝汽器及凝结水泵，所述凝结水泵与省煤器相连；所述脱硝脱硫系统包括依次相连的液氨蒸发器、氨气/空气混合器、氨喷射网格设备、脱硝反应器、空气预热器、电除尘器及脱硫系统，所述氨喷射网格设备与省煤器相连。本发明的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统，液氨脱硝系统、脱硫系统、单乙醇胺脱碳系统能够完成对燃煤机组烟气中的NOx、SO2、CO2进行脱除，实现燃煤机组的烟气减排。
The invention provides a solar geothermal energy CO2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system to realize the flue gas emission reduction of the coal-fired unit, including a coal-fired power generation system, a denitrification and desulfurization system, a monoethanolamine CO2 absorption system, Solar and geothermal energy assisted supercritical CO Rankine cycle system; the coal-fired power generation system includes an economizer, a boiler, a steam turbine, a condenser and a condensate pump connected in sequence, and the condensate pump is connected to the economizer; The denitrification and desulfurization system includes a liquid ammonia evaporator, an ammonia gas/air mixer, an ammonia injection grid equipment, a denitrification reactor, an air preheater, an electrostatic precipitator and a desulfurization system connected in sequence, and the ammonia injection grid equipment and Economizer connected. The solar geothermal energy CO 2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system of the present invention, liquid ammonia denitrification system, desulfurization system, and monoethanolamine decarbonization system can complete the NOx, SO 2 , CO 2 in the flue gas of the coal-fired unit Removal is carried out to realize the reduction of flue gas emission of coal-fired units.
Description
技术领域technical field
本发明涉及一种燃煤机组设备，尤其是一种太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统。The invention relates to a coal-fired unit equipment, in particular to a solar geothermal energy CO 2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system.
背景技术Background technique
经济发展被视为环境变化的驱动力，随着全球经济的发展，能源消耗逐年增加，能源的过度消耗进一步加大了能源供应压力、环境污染、气候恶化等问题。联合国环境规划署(UNEP)2013年末出台的《环境署排放情况差距报告》指出，世界在努力减少温室气体排放方面成绩不佳，即便各国兑现了当前的气候承诺，2020年温室气体的排放量很可能相当于80到120亿吨二氧化碳当量，这要超出所建议的世界气温上升幅度低于2℃的建议水平。面对日益增长的环境危机，不断变化的气候格局，现已有多个全球和地区协议来解决环境问题，如《21世纪议程》(UNCED1992)、《约翰内斯堡行动计划》(WSSD2002)、《长程越界空气污染公约》(CLRTAP)(UNECE1979)等。良好功能的生态系统对于可持续的社会和经济进步必不可少，为了解决环境、社会和经济的可持续性问题，世界各国都在调整能源消费结构，积极寻求提高能源利用效率的新途径，开展可再生能源利用技术研究，逐步实现高效、节能、减排的总体目标。目前，能源结构正朝着科学、绿色、低碳方向发展。燃煤发电机组是CO2、NOx集中、稳定的排放源，目前碳捕集技术主要以单乙醇胺(MEA)化学吸收法为主，NOx的脱除主要以液氨法为主。燃烧后脱碳脱硝系统中吸收剂和还原剂需要消耗大量的热能，传统方法是以机组抽汽作为脱碳脱硝系统的热源，这对机组的经济安全运行相当不利。如果能将分离之后的CO2利用，并为脱碳脱硝系统提供能量，既能满足脱碳解吸能耗和脱硝消耗能耗的问题，也可以解决CO2的再利用问题。这样既满足了碳减排的要求，达到了资源循环利用的目的，可整体提高系统的经济性。Economic development is regarded as the driving force of environmental change. With the development of the global economy, energy consumption is increasing year by year. Excessive energy consumption has further increased the pressure on energy supply, environmental pollution, and climate deterioration. The "UNEP Emissions Gap Report" issued by the United Nations Environment Program (UNEP) in late 2013 pointed out that the world is not doing well in its efforts to reduce greenhouse gas emissions. That could equate to between 8 and 12 gigatonnes of carbon dioxide equivalent, which is more than the recommended level for keeping the world temperature rise below 2°C. In the face of growing environmental crises and changing climate patterns, there have been multiple global and regional agreements to address environmental issues, such as Agenda 21 (UNCED1992), Johannesburg Action Plan (WSSD2002), Long-range Transboundary Convention on Air Pollution (CLRTAP) (UNECE1979), etc. A well-functioning ecosystem is essential for sustainable social and economic progress. In order to solve environmental, social and economic sustainability issues, countries around the world are adjusting energy consumption structures, actively seeking new ways to improve energy efficiency, and developing Renewable energy utilization technology research, and gradually achieve the overall goals of high efficiency, energy saving, and emission reduction. At present, the energy structure is developing in a scientific, green and low-carbon direction. Coal-fired generating units are concentrated and stable emission sources of CO 2 and NOx. At present, the carbon capture technology is mainly based on monoethanolamine (MEA) chemical absorption method, and the removal of NOx is mainly based on liquid ammonia method. The absorbent and reducing agent in the post-combustion decarbonization and denitrification system need to consume a lot of heat energy. The traditional method is to use the steam extraction of the unit as the heat source of the decarbonization and denitrification system, which is quite unfavorable to the economical and safe operation of the unit. If the separated CO2 can be utilized to provide energy for the decarbonization and denitrification system, it can not only meet the energy consumption of decarbonization and desorption and denitrification, but also solve the problem of CO2 reuse. This not only meets the requirements of carbon emission reduction, but also achieves the purpose of resource recycling, and can improve the economy of the system as a whole.
发明内容Contents of the invention
本发明提供了一种实现燃煤机组的烟气减排的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统。The invention provides a solar geothermal energy CO 2 Rankine cycle assisted decarbonization and denitrification system for the coal-fired unit to realize the reduction of flue gas emissions of the coal-fired unit.
实现本发明目的的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统，包括燃煤发电系统、脱硝脱硫系统、单乙醇胺CO2吸收系统、太阳能与地热能辅助超临界CO2朗肯循环系统；The solar geothermal energy CO2 Rankine cycle assisted coal-fired unit decarbonization and denitrification system for realizing the purpose of the present invention includes a coal-fired power generation system, a denitrification and desulfurization system, a monoethanolamine CO2 absorption system, and solar and geothermal energy assisted supercritical CO2 Rankine circulatory system;
所述燃煤发电系统包括依次连接的省煤器、锅炉、汽轮机、凝汽器及凝结水泵，所述凝结水泵与省煤器相连；The coal-fired power generation system includes an economizer, a boiler, a steam turbine, a condenser and a condensate pump connected in sequence, and the condensate pump is connected to the economizer;
所述脱硝脱硫系统包括依次相连的液氨蒸发器、氨气/空气混合器、氨喷射网格设备、脱硝反应器、空气预热器、电除尘器及脱硫系统，所述氨喷射网格设备与省煤器相连；The denitrification and desulfurization system includes liquid ammonia evaporators, ammonia/air mixers, ammonia injection grid equipment, denitrification reactors, air preheaters, electrostatic precipitators and desulfurization systems connected in sequence. The ammonia injection grid equipment Connected with economizer;
所述单乙醇胺CO2吸收系统包括依次相连的吸收塔、第一溶液泵、第二溶液换热器、再生塔、再沸器，所述第二溶液换热器与再生塔之间还设有第二溶液泵，所述吸收塔与第二溶液换热器之间还依次设有第一溶液换热器和混合器，所述再生塔还连接有资源化利用设备，所述吸收塔与脱硫系统相连；The monoethanolamine CO2 absorption system includes an absorption tower, a first solution pump, a second solution heat exchanger, a regeneration tower, and a reboiler connected in sequence, and a The second solution pump, a first solution heat exchanger and a mixer are also arranged in sequence between the absorption tower and the second solution heat exchanger, and the regeneration tower is also connected with resource utilization equipment, and the absorption tower and the desulfurization system connection;
所述太阳能与地热能辅助超临界CO2朗肯循环系统包括依次连接的工质泵、地热能辅助系统、膨胀机、换热器及储罐，所述地热能辅助系统与膨胀机之间还连接有并联设置的太阳能集热器和储能器；所述膨胀机上还连接有发电机，所述膨胀机还与液氨蒸发器相连；所述发电机分别与第一溶液泵和第二溶液泵、凝结水泵和工质泵相连；所述储罐还与液氨蒸发器、再生塔和资源化利用设备相连。The solar and geothermal energy assisted supercritical CO2 Rankine cycle system includes a working medium pump, a geothermal energy auxiliary system, an expander, a heat exchanger, and a storage tank connected in sequence. A solar heat collector and an energy storage device arranged in parallel are connected; an electric generator is also connected on the expander, and the expander is also connected with the liquid ammonia evaporator; the electric generator is connected with the first solution pump and the second solution pump respectively. The pump, the condensate pump and the working medium pump are connected; the storage tank is also connected with the liquid ammonia evaporator, the regeneration tower and the resource utilization equipment.
本发明的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统的有益效果如下：The beneficial effects of the solar geothermal energy CO2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system of the present invention are as follows:
(1)本发明的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统，液氨脱硝系统、脱硫系统、单乙醇胺脱碳系统能够完成对燃煤机组烟气中的NOx、SO2、CO2进行脱除，实现燃煤机组的烟气减排。(1) The solar geothermal energy CO2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system of the present invention, liquid ammonia denitrification system, desulfurization system, and monoethanolamine decarburization system can complete the NOx and SO2 in the flue gas of coal - fired units , CO 2 removal, and realize the reduction of flue gas emission of coal-fired units.
(2)充分利用地热能、太阳能等可再生能源，减少化石燃料消耗。(2) Make full use of renewable energy such as geothermal energy and solar energy to reduce the consumption of fossil fuels.
(3)充分利用捕集到的CO2，一方面使其资源化转化；另一方面通过以地热能、太阳能为热源的超临界CO2朗肯循环，实现CO2发电，为整个系统提供动力源。(3) Make full use of the captured CO 2 , on the one hand to convert it into resources; on the other hand, through the supercritical CO 2 Rankine cycle with geothermal energy and solar energy as the heat source, realize CO 2 power generation and provide power for the entire system source.
(4)CO2换热器凝结的热量为CO2吸收剂的解吸提供热源，改善从机组抽汽为吸收剂解吸提供热源的供能方式。(4) The condensed heat of the CO2 heat exchanger provides a heat source for the desorption of the CO2 absorbent, and improves the energy supply method for extracting steam from the unit to provide a heat source for the desorption of the absorbent.
(5)在膨胀机做功之后的高温低压CO2为液氨蒸发器提供热源，使液氨蒸发为氨气进入到脱硝系统中，改善从机组抽汽或电加热为蒸发器供能的方式。(5) The high-temperature and low-pressure CO 2 after the work done by the expander provides a heat source for the liquid ammonia evaporator, so that the liquid ammonia evaporates into ammonia gas and enters the denitrification system, improving the way of steam extraction from the unit or electric heating for the evaporator.
附图说明Description of drawings
图1为本发明的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统的结构示意图。Fig. 1 is a structural schematic diagram of the solar geothermal energy CO 2 Rankine cycle auxiliary coal-fired unit decarbonization and denitrification system of the present invention.
具体实施方式detailed description
如图1所示，本发明的太阳能地热能CO2朗肯循环辅助燃煤机组脱碳脱硝系统，包括燃煤发电系统、脱硝脱硫系统、单乙醇胺CO2吸收系统、太阳能与地热能辅助超临界CO2朗肯循环系统；As shown in Figure 1, the solar geothermal energy CO 2 Rankine cycle assisted coal-fired unit decarbonization and denitrification system of the present invention includes a coal-fired power generation system, a denitrification and desulfurization system, a monoethanolamine CO 2 absorption system, and solar and geothermal energy assisted supercritical CO2 Rankine cycle system;
所述燃煤发电系统包括依次连接的省煤器1、锅炉2、汽轮机3、凝汽器4及凝结水泵5，所述凝结水泵5与省煤器1相连；The coal-fired power generation system includes an economizer 1, a boiler 2, a steam turbine 3, a condenser 4 and a condensate pump 5 connected in sequence, and the condensate pump 5 is connected to the economizer 1;
所述脱硝脱硫系统包括依次相连的液氨蒸发器6、氨气/空气混合器7、氨喷射网格设备8、脱硝反应器9、空气预热器10、电除尘器11及脱硫系统12，所述氨喷射网格设备8与省煤器1相连；The denitration and desulfurization system includes a liquid ammonia evaporator 6, an ammonia gas/air mixer 7, an ammonia injection grid equipment 8, a denitration reactor 9, an air preheater 10, an electrostatic precipitator 11 and a desulfurization system 12 connected in sequence, The ammonia injection grid equipment 8 is connected to the economizer 1;
所述单乙醇胺CO2吸收系统包括依次相连的吸收塔13、第一溶液泵14、第二溶液换热器15、再生塔16、再沸器17，所述第二溶液换热器15与再生塔16之间还设有第二溶液泵18，所述吸收塔13与第二溶液换热器15之间还依次设有第一溶液换热器20和混合器19，所述再生塔16还连接有资源化利用设备21，所述吸收塔13与脱硫系统12相连；The monoethanolamine CO2 absorption system comprises an absorption tower 13, a first solution pump 14, a second solution heat exchanger 15, a regeneration tower 16, and a reboiler 17 connected in sequence, and the second solution heat exchanger 15 and regeneration A second solution pump 18 is also arranged between the towers 16, a first solution heat exchanger 20 and a mixer 19 are also arranged successively between the absorption tower 13 and the second solution heat exchanger 15, and the regeneration tower 16 also Connected with resource utilization equipment 21, the absorption tower 13 is connected with the desulfurization system 12;
所述太阳能与地热能辅助超临界CO2朗肯循环系统包括依次连接的工质泵22、地热能辅助系统23、膨胀机26、换热器28及储罐29，所述地热能辅助系统23与膨胀机26之间还连接有并联设置的太阳能集热器24和储能器25；所述膨胀机26上还连接有发电机27，所述膨胀机26还与液氨蒸发器6相连；所述发电机27分别与第一溶液泵14和第二溶液泵18、凝结水泵5和工质泵22相连；所述储罐29还与液氨蒸发器6、再生塔16和资源化利用设备21相连。The solar and geothermal energy assisted supercritical CO Rankine cycle system includes a working medium pump 22, a geothermal energy auxiliary system 23, an expander 26, a heat exchanger 28 and a storage tank 29 connected in sequence, and the geothermal energy auxiliary system 23 Also connected with the solar heat collector 24 and the accumulator 25 that are arranged in parallel with the expander 26; The expander 26 is also connected with a generator 27, and the expander 26 is also connected with the liquid ammonia evaporator 6; The generator 27 is connected with the first solution pump 14 and the second solution pump 18, the condensate pump 5 and the working medium pump 22 respectively; the storage tank 29 is also connected with the liquid ammonia evaporator 6, the regeneration tower 16 and resource utilization equipment 21 connected.
燃煤发电系统通过凝结水泵5连接太阳能与地热能辅助超临界CO2朗肯循环系统连接；燃煤发电系统通过省煤器1与脱硝脱硫系统连接；脱硝脱硫系统通过吸收塔13与脱碳系统连接，通过液氨蒸发器6与太阳能、地热能-超临界CO2朗肯循环系统连接；太阳能、地热能-超临界CO2朗肯循环系统中CO2换热器28的水侧通过管路连接至再沸器17。液氨蒸发器6和从膨胀机26排出的CO2换热后产生氨气，氨气和空气在氨气/空气混合器7中混合后和烟气经由氨喷射网格设备8进入脱硝反应器9，脱硝后的烟气经空气预热器10、电除尘器11及脱硫系统12进入吸收塔13。吸收塔13底部连接第一溶液泵14，第一溶液泵连接第一溶液和第二溶液换热器15的入口，第一溶液和第二溶液换热器的出口与连接再生塔16连接，从再生塔出来的高纯CO2经压缩后输运至资源化利用设备21和储罐29；再生塔16下部连接再沸器17，工质换热器28为再沸器提供解吸热源使得CO2吸收剂再生，高温的贫液经过第二溶液泵18连接至第一溶液和第二溶液换热器15，经混合器19和第二溶液换热器20进入吸收塔再次和脱硝脱硫后的烟气反应完成循环利用。太阳能与地热能辅助超临界CO2朗肯循环系统中工质CO2推动膨胀机26做功驱动发电机27发电，用以提供整个系统中各设备的电力消耗。The coal-fired power generation system is connected to the solar energy and geothermal energy assisted supercritical CO2 Rankine cycle system through the condensate pump 5; the coal-fired power generation system is connected to the denitrification and desulfurization system through the economizer 1; the denitrification and desulfurization system is connected to the decarbonization system through the absorption tower 13 Connect, connect with solar energy, geothermal energy-supercritical CO Rankine cycle system by liquid ammonia evaporator 6; CO in the solar energy, geothermal energy-supercritical CO Rankine cycle system The water side of heat exchanger 28 passes through pipeline Connected to reboiler 17. The liquid ammonia evaporator 6 exchanges heat with the CO discharged from the expander 26 to produce ammonia gas, and the ammonia gas and air are mixed in the ammonia/air mixer 7 and the flue gas enters the denitrification reactor through the ammonia injection grid equipment 8 9. The denitrified flue gas enters the absorption tower 13 through the air preheater 10, the electrostatic precipitator 11 and the desulfurization system 12. The bottom of the absorption tower 13 is connected with the first solution pump 14, the first solution pump is connected with the inlet of the first solution and the second solution heat exchanger 15, and the outlet of the first solution and the second solution heat exchanger is connected with the regeneration tower 16, from The high-purity CO 2 from the regeneration tower is compressed and transported to resource utilization equipment 21 and storage tank 29; the lower part of the regeneration tower 16 is connected to the reboiler 17, and the working fluid heat exchanger 28 provides a desorption heat source for the reboiler to make CO 2 The absorbent is regenerated, and the high-temperature lean liquid is connected to the first solution and the second solution heat exchanger 15 through the second solution pump 18, and then enters the absorption tower through the mixer 19 and the second solution heat exchanger 20 to be mixed with the smoke after denitrification and desulfurization again. Gas reaction completes recycling. Solar energy and geothermal energy assist the working medium CO 2 in the supercritical CO 2 Rankine cycle system to drive the expander 26 to do work and drive the generator 27 to generate electricity to provide power consumption for each device in the entire system.
本发明由四个系统组成：燃煤发电系统、脱硝脱硫系统、单乙醇胺CO2吸收系统、太阳能与地热能辅助超临界CO2朗肯循环系统。通过省煤器与喷氨网格设备，将燃煤发电系统与脱硝脱硫系统连接起来。通过脱硫系统与吸收塔，将脱硝脱硫系统与单乙醇胺CO2吸收系统连接起来。通过CO2换热器与再沸器，将太阳能与地热能辅助超临界CO2朗肯循环系统与单乙醇胺CO2吸收系统连接起来。通过膨胀机与液氨蒸发器，将太阳能与地热能辅助超临界CO2朗肯循环系统与脱硝脱硫系统连接起来。上述连接实现了四个系统的有机结合。通过上述连接构成了基于太阳能与地热能辅助超临界CO2朗肯循环辅助燃煤机组脱碳脱硝的系统装置。The invention consists of four systems: a coal-fired power generation system, a denitrification and desulfurization system, a monoethanolamine CO2 absorption system, and a supercritical CO2 Rankine cycle system assisted by solar and geothermal energy. Connect the coal-fired power generation system with the denitrification and desulfurization system through the economizer and the ammonia injection grid equipment. Through the desulfurization system and the absorption tower, the denitrification and desulfurization system is connected with the monoethanolamine CO2 absorption system. The solar and geothermal assisted supercritical CO2 Rankine cycle system is connected with the monoethanolamine CO2 absorption system through the CO2 heat exchanger and reboiler. Through the expander and liquid ammonia evaporator, the solar and geothermal energy assisted supercritical CO2 Rankine cycle system is connected with the denitrification and desulfurization system. The above connections realize the organic combination of the four systems. Through the above connections, a system device based on solar energy and geothermal energy assisted supercritical CO 2 Rankine cycle assisted decarbonization and denitrification of coal-fired units is formed.
脱硝脱硫系统中液氨蒸发器的热源由太阳能与地热能朗肯循环系统的膨胀机排气提供，改善由机组抽汽或电加热为液氨蒸发器提供热源的供能方式，减少了机组煤耗，提高了机组经济性与安全性。The heat source of the liquid ammonia evaporator in the denitrification and desulfurization system is provided by the exhaust gas of the expander of the solar and geothermal energy Rankine cycle system, which improves the energy supply method of providing heat source for the liquid ammonia evaporator by unit extraction or electric heating, and reduces the coal consumption of the unit , improving the economy and safety of the unit.
脱碳系统中吸收剂的解吸热源由太阳能、地热能朗肯循环系统的换热器提供，改善由机组抽汽为再沸器提供热源的供能方式，减少了机组煤耗，提高了机组经济性与安全性。The heat source for the desorption of the absorbent in the decarbonization system is provided by the heat exchanger of the rankine cycle system of solar energy and geothermal energy, which improves the energy supply method in which the unit extracts steam to provide the heat source for the reboiler, reduces the coal consumption of the unit, and improves the economy of the unit and security.
太阳能、地热能朗肯循环系统利用脱碳系统所捕集到的CO2作为工质，实现了CO2的再利用，有利于减缓温室效应。Solar energy and geothermal energy Rankine cycle system use the CO 2 captured by the decarbonization system as a working medium to realize the reuse of CO 2 and help to slow down the greenhouse effect.
太阳能、地热能朗肯循环系统所发电力可为整个系统提供电力供应。The power generated by solar energy and geothermal energy Rankine cycle system can provide power supply for the whole system.
上面所述的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神前提下，本领域普通工程技术人员对本发明技术方案做出的各种变形和改进，均应落入本发明的权利要求书确定的保护范围内。The above-described embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various technical solutions of the present invention can be made by ordinary engineers and technicians in the field. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.
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