技术领域technical field
本发明涉及一种太阳能辅助碳捕集技术，具体涉及一种太阳能有机朗肯循环辅助燃煤发电进行碳捕集的系统装置。The invention relates to a solar energy-assisted carbon capture technology, in particular to a system device for solar organic Rankine cycle assisted coal-fired power generation for carbon capture.
背景技术Background technique
根据国际能源署的目标，在2050年之前全球气温升温应严格控制在2℃之内，实现目标的关键在于控制温室气体的排放量。碳捕捉与存储（CCS）技术能够十分显著地减少已建能源设施19%的温室气体排放量。在工业生产过程中现有的碳捕集技术可分为燃烧后与燃烧前的捕集以及富氧燃烧技术。目前应用较为广泛的是燃烧后捕集，即在捕集系统装置中，利用物理吸附或化学吸收等方法对燃烧生成的烟气进行二氧化碳分离和捕捉。众所周知在水泥的生产过程中，将耗费大量的热能，而目前乙醇胺吸收法（MEA）溶液再生也需要大量能耗。目前多采用汽轮机低压抽汽的方式提供热能，这样严重影响了发电厂的经济效益。如果利用太阳能对碳捕捉系统进行能耗供应，既能满足对发电厂二氧化碳的减排要求，也能最大限度地利用自然能源，提高碳捕集的经济性。According to the goal of the International Energy Agency, the global temperature increase should be strictly controlled within 2°C before 2050, and the key to achieving the goal is to control the emission of greenhouse gases. Carbon capture and storage (CCS) technology can significantly reduce greenhouse gas emissions from built energy facilities by 19%. The existing carbon capture technologies in the industrial production process can be divided into post-combustion and pre-combustion capture and oxygen-enriched combustion technologies. At present, post-combustion capture is widely used, that is, in the capture system device, physical adsorption or chemical absorption is used to separate and capture carbon dioxide from the flue gas generated by combustion. It is well known that a large amount of heat energy will be consumed in the production process of cement, and the current regeneration of ethanolamine absorption (MEA) solution also requires a large amount of energy. At present, the way of steam turbine low-pressure extraction is mostly used to provide heat energy, which seriously affects the economic benefits of power plants. If solar energy is used to supply energy to the carbon capture system, it can not only meet the carbon dioxide emission reduction requirements of power plants, but also maximize the use of natural energy and improve the economy of carbon capture.
发明内容Contents of the invention
本发明的目的在于：为了实现燃煤电厂二氧化碳捕集及电厂稳定经济运行，从而提供一种太阳能有机朗肯循环辅助二氧化碳捕集系统及方法。The purpose of the present invention is to provide a solar organic Rankine cycle assisted carbon dioxide capture system and method in order to realize the carbon dioxide capture of coal-fired power plants and the stable and economical operation of the power plants.
太阳能有机朗肯循环辅助燃煤发电进行碳捕集的系统装置包括：槽式太阳能集热器、蒸汽发生器、储油罐、导热油泵、汽轮机、发电机、有机工质冷凝器、工质泵、吸收塔、第一溶液泵、解析塔、溶液冷凝器、压缩机、再沸器、第二溶液泵、换热器、锅炉、汽轮机、凝汽器以及水泵等。其技术连接方案是：槽式太阳能集热器和蒸发器的导热油工质侧以及储油罐、导油泵依次顺序连接构成太阳能热利用系统；蒸发器的有机工质侧、汽轮机、发电机、冷凝器以及工质泵依次顺序连接构成有机朗肯系统；由吸收塔、第一溶液泵、解析塔、冷凝器、压缩机、再沸器、第二溶液泵以及换热器组合连接构成乙醇胺CO2吸收系统；由燃煤锅炉蒸汽管、汽轮机、凝汽器以及水泵依次顺序连接构成燃煤发电系统。太阳能热利用系统与有机朗肯系统通过蒸发器连接起来，燃煤锅炉的高温废气管接至吸收塔的下端，冷凝器的水侧通过管路接至再沸器的水侧。吸收塔底部外端接有第一溶液泵，第一溶液泵接于换热器低温侧的进口，换热器低温侧的出口与解析塔连接。解析塔上部设有冷凝器，吸收溶液在冷凝器中与解析塔构成自循环。解析塔下部设有再沸器，再沸器利用冷凝器获取的热源对解析塔中释放CO2后的溶液进行再热，再沸器中的高温溶液侧与第二溶液泵相接，将溶液通过换热器的高温侧送入吸收塔。汽轮机做功驱动发电机发电，用以提供第一、第二溶液泵及压缩机运转。The solar organic Rankine cycle assisted coal-fired power generation system for carbon capture includes: trough solar collectors, steam generators, oil storage tanks, heat transfer oil pumps, steam turbines, generators, organic refrigerant condensers, and refrigerant pumps , absorption tower, first solution pump, desorption tower, solution condenser, compressor, reboiler, second solution pump, heat exchanger, boiler, steam turbine, condenser and water pump, etc. Its technical connection scheme is: the trough solar collector and the heat transfer oil working medium side of the evaporator, the oil storage tank, and the oil guiding pump are sequentially connected to form a solar heat utilization system; the organic working medium side of the evaporator, steam turbine, generator, The condenser and the working medium pump are connected in sequence to form an organic Rankine system; the ethanolamine CO2 Absorption system: The coal-fired power generation system is composed of coal-fired boiler steam pipes, steam turbines, condensers and water pumps connected in sequence. The solar thermal utilization system is connected to the organic Rankine system through the evaporator, the high-temperature waste gas pipe of the coal-fired boiler is connected to the lower end of the absorption tower, and the water side of the condenser is connected to the water side of the reboiler through a pipeline. A first solution pump is connected to the outer end of the bottom of the absorption tower, the first solution pump is connected to the inlet of the low-temperature side of the heat exchanger, and the outlet of the low-temperature side of the heat exchanger is connected to the desorption tower. A condenser is arranged on the upper part of the desorption tower, and the absorption solution forms a self-circulation with the desorption tower in the condenser. The lower part of the desorption tower is equipped with a reboiler. The reboiler uses the heat source obtained by the condenser to reheat the solution released from the desorption tower. The high- temperature solution side in the reboiler is connected to the second solution pump to transfer the solution It is sent to the absorption tower through the high temperature side of the heat exchanger. The steam turbine works to drive the generator to generate electricity to provide the operation of the first and second solution pumps and compressors.
利用燃煤电厂锅炉燃烧后含有大量CO2的烟气从底部送入吸收塔，与塔顶喷射的乙醇胺吸收溶液热反应，烟气中的CO2被溶液吸收，废气从吸收塔塔顶排出。吸收CO2的溶液经第一溶液泵加压后从顶部进入解析塔，与底部上升的蒸汽进行换热反应，CO2从吸收溶液中解析并从解析塔塔顶排入冷凝器，CO2气体经冷凝后进入压缩机进行压缩以便于运输和存储。释放CO2后的溶液进入解析塔底部，经再沸器提供解析塔所需水蒸气后，经第二溶液泵与解析塔进口溶液换热后进入吸收塔循环使用。槽式太阳能集热器利用太阳能热加热导热油，高温导热油进入蒸发器，与有机工质进行换热后进入油罐，经油泵通过循环管路重新进入槽式太阳能真空管吸收热量完成循环。有机工质在蒸发器中蒸发为高温高压蒸汽，进入汽轮机膨胀做功，膨胀后的工质乏汽进入冷凝器冷凝，经工质泵重新进入蒸发器完成有机朗肯循环。朗肯循环系统中有机工质冷凝器的液态水被加热为低压蒸汽后进入再沸器，用以加热再沸器中的溶液以产生水蒸气完成CO2的解析，汽轮机驱动发电机发电，用以提供溶液泵、二氧化碳压缩机等耗功设备。The flue gas containing a large amount ofCO2 after combustion of the coal-fired power plant boiler is sent into the absorption tower from the bottom, and thermally reacts with the ethanolamine absorption solution sprayed from the top of the tower. TheCO2 in the flue gas is absorbed by the solution, and the exhaust gas is discharged from the top of the absorption tower. TheCO2 -absorbing solution is pressurized by the first solution pump and enters the desorption tower from the top, and performs heat exchange reaction with the steam rising from the bottom.CO2 is desorbed from the absorption solution and discharged into the condenser from the top of the desorption tower, andCO2 gas After being condensed, it enters the compressor for compression for transportation and storage. The solution after releasingCO2 enters the bottom of the desorption tower, and after the water vapor required by the desorption tower is provided by the reboiler, it exchanges heat with the inlet solution of the desorption tower through the second solution pump, and then enters the absorption tower for recycling. The trough solar collector uses solar heat to heat the heat transfer oil. The high temperature heat transfer oil enters the evaporator, exchanges heat with the organic working fluid, and then enters the oil tank. After the oil pump passes through the circulation pipeline, it re-enters the trough solar vacuum tube to absorb heat to complete the cycle. The organic working medium is evaporated into high-temperature and high-pressure steam in the evaporator, and enters the steam turbine to expand and do work. The expanded working medium exhaust steam enters the condenser to condense, and re-enters the evaporator through the working medium pump to complete the organic Rankine cycle. The liquid water in the condenser of the organic working medium in the Rankine cycle system is heated to low-pressure steam and then enters the reboiler to heat the solution in the reboiler to generate water vapor to complete the analysis ofCO2 . The steam turbine drives the generator to generate electricity. To provide power-consuming equipment such as solution pumps and carbon dioxide compressors.
膨胀后的低温低压过热有机工质蒸汽进入有机工质冷凝器，经冷却后成为饱和液态有机工质，此时与工质换热（冷凝器水侧）的水升温成为低压过热蒸汽，进入（乙醇胺二氧化碳捕集系统）解析塔下面的再沸器，对再沸器中的溶液进行加热，产生的溶液蒸汽进入解析塔完成CO2的解析过程。The expanded low-temperature and low-pressure superheated organic working medium steam enters the organic working medium condenser, and becomes saturated liquid organic working medium after being cooled. At this time, the water that exchanges heat with the working medium (on the water side of the condenser) heats up and becomes low-pressure superheated steam, which enters ( Ethanolamine carbon dioxide capture system) The reboiler under the desorption tower heats the solution in the reboiler, and the generated solution vapor enters the desorption tower to complete theCO2 desorption process.
本发明的特点以及产生的有益效果是：（1）乙醇胺二氧化碳捕集系统能够完成对燃煤电站废气中CO2的捕集，以减少燃煤电厂的碳排放。（2）充分利用太阳能新能源，减少能源的消耗（3）通过以太阳能为热源的有机朗肯循环，用以碳捕捉系统动力设备驱动，凝结的热量再用以解析过程的能耗，使有机朗肯循环效率达到100%。The characteristics and beneficial effects of the present invention are: (1) The ethanolamine carbon dioxide capture system can complete the capture of CO2 in the exhaust gas of coal-fired power plants, so as to reduce the carbon emissions of coal-fired power plants. (2) Make full use of new solar energy to reduce energy consumption (3) Through the organic Rankine cycle using solar energy as the heat source, it is driven by the power equipment of the carbon capture system, and the condensed heat is used to analyze the energy consumption of the process, so that the organic Rankine cycle efficiency reaches 100%.
附图说明Description of drawings
所示附图为本发明的系统原理及结构组成示意图。The accompanying drawing is a schematic diagram of the system principle and structural composition of the present invention.
具体实施方式Detailed ways
以下结合附图并通过实施例对本发明的原理与结构作进一步的说明。The principle and structure of the present invention will be further described below in conjunction with the accompanying drawings and through embodiments.
太阳能有机朗肯循环辅助燃煤发电进行碳捕集的系统装置，其组成结构是：槽式太阳能集热器1、蒸发器2、储油罐3以及导油泵4依次顺序连接构成太阳能热利用系统；蒸发器2、汽轮机5、发电机6、有机工质冷凝器7以及工质泵8依次顺序连接构成有机朗肯系统；由吸收塔9、第一溶液泵10、解析塔11、溶液冷凝器12、压缩机13、再沸器14、第二溶液泵15以及换热器16组合连接构成乙醇胺CO2吸收系统；由燃煤锅炉17蒸汽管、汽轮机18、凝汽器19以及水泵20依次顺序连接构成燃煤发电系统。太阳能热利用系统与有机朗肯系统通过蒸发器连接起来；燃煤锅炉17的高温废气管接至吸收塔9的下端；有机工质冷凝器7的水侧通过管路接至再沸器14的水侧。吸收塔底部外端接有第一溶液泵10，第一溶液泵接于换热器16低温侧的进口，换热器低温侧的出口与解析塔11连接。解析塔上部设有溶液冷凝器12，吸收溶液在溶液冷凝器中与解析塔构成自循环。解析塔下部设有再沸器14，再沸器利用工质冷凝器7获取的热源对解析塔中释放CO2后的溶液进行再热。再沸器中的高温溶液侧与第二溶液泵15相接，将溶液通过换热器的高温侧送入吸收塔，燃气锅炉高温废气管接至吸收塔底部。汽轮机5做功驱动发电机6发电，用以提供第一、第二溶液泵及CO2压缩机运转。The solar organic Rankine cycle assisted coal-fired power generation system device for carbon capture. Its composition structure is: trough solar collector 1, evaporator 2, oil storage tank 3 and oil guide pump 4 are sequentially connected to form a solar heat utilization system Evaporator 2, steam turbine 5, generator 6, organic working medium condenser 7 and working medium pump 8 are sequentially connected to form an organic Rankine system; by absorption tower 9, first solution pump 10, analytical tower 11, solution condenser 12. Compressor 13, reboiler 14, second solution pump 15 and heat exchanger 16 are combined and connected to form ethanolamineCO2 absorption system; steam pipe of coal-fired boiler 17, steam turbine 18, condenser 19 and water pump 20 are sequentially The connection constitutes a coal-fired power generation system. The solar heat utilization system is connected to the organic Rankine system through an evaporator; the high-temperature exhaust gas pipe of the coal-fired boiler 17 is connected to the lower end of the absorption tower 9; the water side of the organic working medium condenser 7 is connected to the reboiler 14 through a pipeline. water side. A first solution pump 10 is connected to the outer end of the bottom of the absorption tower. The first solution pump is connected to the inlet of the low-temperature side of the heat exchanger 16 , and the outlet of the low-temperature side of the heat exchanger is connected to the desorption tower 11 . A solution condenser 12 is arranged on the upper part of the desorption tower, and the absorption solution forms a self-circulation with the desorption tower in the solution condenser. The lower part of the desorption tower is provided with a reboiler 14, and the reboiler utilizes the heat source obtained by the working fluid condenser 7 to reheat the solution released from the desorption tower after CO2 . The high-temperature solution side in the reboiler is connected to the second solution pump 15, and the solution is sent to the absorption tower through the high-temperature side of the heat exchanger, and the high-temperature waste gas pipe of the gas boiler is connected to the bottom of the absorption tower. The steam turbine 5 works to drive the generator 6 to generate electricity to provide the operation of the first and second solution pumps and theCO compressor.
本发明由四个系统组成，即：太阳能热利用系统、有机朗肯系统、乙醇胺CO2吸收系统和燃煤发电系统。通过蒸发器的导热油侧和工质侧，将太阳能热利用系统与有机朗肯系统连接起来。通过燃煤锅炉的高温废气管接至吸收塔的下端，将乙醇胺CO2吸收系统与燃煤发电系统连接起来。通过冷凝器的水侧通过管路接至再沸器的水侧，将乙醇胺CO2吸收系统与有机朗肯系统连接起来。通过上述连接构成碳捕集的系统装置。The present invention consists of four systems, namely: solar heat utilization system, organic Rankine system, ethanolamineCO2 absorption system and coal-fired power generation system. The solar heat utilization system is connected with the organic Rankine system through the heat transfer oil side and the working fluid side of the evaporator. The high-temperature waste gas pipe of the coal-fired boiler is connected to the lower end of the absorption tower, and the ethanolamineCO2 absorption system is connected with the coal-fired power generation system. Connect the ethanolamineCO2 absorption system with the Organic Rankine system by piping the water side of the condenser to the water side of the reboiler. A system device for carbon capture is formed through the above connection.
有机朗肯循环的工质选用具有高冷凝温度，保证冷凝温度保持在120℃以上，用以再沸器产生低压蒸汽完成解析塔中二氧化碳解析过程。朗肯循环中，本实施例所用有机工质为甲苯。The working medium of the Organic Rankine Cycle is selected to have a high condensation temperature, ensuring that the condensation temperature is kept above 120°C, and is used for the reboiler to generate low-pressure steam to complete the carbon dioxide desorption process in the desorption tower. In the Rankine cycle, the organic working fluid used in this example is toluene.
CO2捕集系统的耗功设备驱动由有机朗肯循环汽轮机输出动力提供。The drive of the power consumption equipment of the CO2 capture system is provided by the output power of the organic Rankine cycle steam turbine.
CO2捕集系统的解析热量由有机朗肯循环冷凝器输出热量提供。The analytical heat of theCO2 capture system is provided by the output heat of the organic Rankine cycle condenser.
CO2捕集系统所需能耗由以太阳能为热源有机朗肯循环提供，即CO2捕集过程解析塔所需热量由太阳能为热源的有机朗肯循环（冷凝器的凝结放热）提供，可避免或减少燃煤电厂汽轮机低压抽汽提供热量，保证燃煤电厂的稳定运行，提高发电效益。The energy consumption required by the CO2 capture system is provided by the organic Rankine cycle with solar energy as the heat source, that is, the heat required by the desorption tower in the CO2 capture process is provided by the organic Rankine cycle (condensation heat release of the condenser) with solar energy as the heat source, It can avoid or reduce the heat provided by the low-pressure extraction steam of the steam turbine in the coal-fired power plant, ensure the stable operation of the coal-fired power plant, and improve the power generation efficiency.
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| CN101509472A (en)* | 2008-07-23 | 2009-08-19 | 昆明理工大学 | Disperse type low-temperature solar thermal power generation system and power generation technique |
| CN101516473A (en)* | 2006-07-17 | 2009-08-26 | 联邦科学及工业研究组织 | CO2 capture using solar thermal energy |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101516473A (en)* | 2006-07-17 | 2009-08-26 | 联邦科学及工业研究组织 | CO2 capture using solar thermal energy |
| CN101509472A (en)* | 2008-07-23 | 2009-08-19 | 昆明理工大学 | Disperse type low-temperature solar thermal power generation system and power generation technique |
| Publication number | Publication date |
|---|---|
| CN103372371A (en) | 2013-10-30 |
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| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20150708 |