CN114522518A - Carbon-containing recycling gas power plant low-cost carbon emission reduction system and method - Google Patents
Carbon-containing recycling gas power plant low-cost carbon emission reduction system and method Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于化石燃料燃烧利用技术领域，尤其涉及一种含碳循环利用的燃气电厂低成本减碳排放系统及方法。The invention belongs to the technical field of fossil fuel combustion and utilization, and in particular relates to a low-cost carbon emission reduction system and method for a gas-fired power plant with carbon-containing recycling.
背景技术Background technique
为减缓温室效应，能源体系正进行绿色低碳转型变革，减少能源系统的二氧化碳排放已成为人类社会共识。甲烷、煤炭、石油等化石燃料由于能量质量密度高、稳定性与可控性好，仍将会作为能源体系不可或缺的一部分发挥作用，火力发电等化石燃料应用领域的碳减排压力巨大，但同时高昂的碳减排成本也进一步加深了化石燃料应用领域的发展困境。二氧化碳捕集设备复杂，需消耗大量化学物质与能量，所消耗的能量折合降低10-15 %的发电效率。因此，如何对二氧化碳进行资源化利用、降低碳减排成本成为化石燃料应用领域急需解决的问题。In order to slow down the greenhouse effect, the energy system is undergoing a green and low-carbon transformation, and reducing carbon dioxide emissions from the energy system has become the consensus of human society. Fossil fuels such as methane, coal, and petroleum will still play an integral role in the energy system due to their high energy density, stability and controllability. But at the same time, the high cost of carbon emission reduction has further deepened the development dilemma of the application of fossil fuels. The carbon dioxide capture equipment is complex and needs to consume a large amount of chemical substances and energy. The energy consumed is equivalent to reducing the power generation efficiency by 10-15%. Therefore, how to utilize carbon dioxide as a resource and reduce the cost of carbon emission reduction has become an urgent problem to be solved in the field of fossil fuel applications.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种含碳循环利用的燃气电厂低成本减碳排放系统及方法，旨在解决现有技术中燃气电厂降低二氧化碳排放成本高昂的问题。The purpose of the present invention is to provide a low-cost carbon emission reduction system and method for a gas-fired power plant with carbon-containing recycling, aiming to solve the problem of the high cost of reducing carbon dioxide emission in the gas-fired power plant in the prior art.
本发明是这样实现的，一种含碳循环利用的燃气电厂低成本减碳排放系统，包括电解池、燃气轮机、CO2预热器、烟气换热器、干燥器、低压压缩机、三通阀、低压间冷换热器、高压压缩机、高压间冷换热器、泵、加氢反应热回收换热器、CO2加氢反应器；其中，The present invention is achieved in this way, a low-cost carbon emission reduction system for a gas-fired power plant with carbon-containing recycling, including an electrolytic cell, a gas turbine, a CO 2 preheater, a flue gas heat exchanger, a dryer, a low-pressure compressor, a tee Valves, low pressure intercooling heat exchangers, high pressure compressors, high pressure intercooling heat exchangers, pumps, hydrogenation reaction heat recovery heat exchangers, CO hydrogenation reactors; among them,
所述电解池中，水通过电解反应产生氧气与氢气，所述电解池的氢气出口连接CO2加氢反应器的氢气进口，所述电解池的氧气出口连接所述燃气轮机的氧气进口，所述燃气轮机的烟气出口连接所述CO2预热器的烟气进口，所述CO2预热器的烟气出口连接所述烟气换热器的烟气进口，所述烟气换热器的烟气出口连接所述干燥器的烟气进口，所述干燥器的CO2出口连接所述低压压缩机进口，所述低压压缩机出口的CO2通过所述三通阀进行分流为两部分CO2；所述三通阀的一个出口与低压间冷换热器的CO2进口连接，所述三通阀的另一个出口与所述CO2加氢反应器的CO2进口连接；In the electrolytic cell, water generates oxygen and hydrogen through an electrolysis reaction, the hydrogen outlet of the electrolytic cell is connected to the hydrogen inlet of the CO hydrogenation reactor, the oxygen outlet of the electrolytic cell is connected to the oxygen inlet of the gas turbine, and the The flue gas outlet of the gas turbine is connected to the flue gas inlet of the CO 2 preheater, and the flue gas outlet of the CO 2 preheater is connected to the flue gas inlet of the flue gas heat exchanger. The flue gas outlet is connected to the flue gas inlet of the dryer, the CO2 outlet of the dryer is connected to the inlet of the low-pressure compressor, and the CO2 at the outlet of the low-pressure compressor is split into two parts of CO through the three-way valve 2 ; an outlet of the three-way valve is connected to the CO 2 inlet of the low-pressure intercooling heat exchanger, and the other outlet of the three-way valve is connected to the CO 2 inlet of the CO 2 hydrogenation reactor;
所述低压间冷换热器的CO2出口连接所述高压压缩机进口，所述高压压缩机的CO2出口连接所述高压间冷换热器的CO2进口，所述高压间冷换热器的CO2出口连接所述泵的CO2进口，所述泵的CO2出口连接所述加氢反应热回收换热器的CO2进口，所述加氢反应热回收换热器的CO2出口连接所述CO2预热器的CO2进口，所述CO2预热器的CO2出口连接所述燃气轮机的CO2回流进口。The CO2 outlet of the low-pressure intercooling heat exchanger is connected to the inlet of the high-pressure compressor, the CO2 outlet of the high-pressure compressor is connected to the CO2 inlet of the high-pressure intercooling heat exchanger, and the high-pressure intercooling heat exchange is The CO2 outlet of the pump is connected to the CO2 inlet of the pump, the CO2 outlet of the pump is connected to the CO2 inlet of the hydrogenation reaction heat recovery heat exchanger, and the CO2 inlet of the hydrogenation reaction heat recovery heat exchanger is connected The outlet is connected to the CO2 inlet of the CO2 preheater, and the CO2 outlet of the CO2 preheater is connected to the CO2 return inlet of the gas turbine.
本发明还提供了一种基于上述系统实现低成本减碳排放的方法，包括以下步骤：The present invention also provides a method for realizing low-cost carbon emission reduction based on the above system, comprising the following steps:
S1、所述电解池中的水发生电化学反应产生氢气与氧气，氧气通入燃气轮机作为助燃剂，在燃气轮机中氧气与天然气进行富氧燃烧，化学能转化为机械能再转化为电能输出，同时产生包含水蒸气和CO2的高温烟气；S1, the water in the electrolytic cell produces hydrogen and oxygen by electrochemical reaction, and oxygen is fed into the gas turbine as a combustion-supporting agent, and in the gas turbine, oxygen and natural gas carry out oxygen-enriched combustion, and chemical energy is converted into mechanical energy and then converted into electrical energy output, and simultaneously produces High temperature flue gas containing water vapor and CO2 ;
S2、所述高温烟气通入CO2预热器中与回流CO2进行换热；S2, the high temperature flue gas is passed into the CO 2 preheater to exchange heat with the refluxing CO 2 ;
S3、所述CO2预热器出口的烟气通入烟气换热器中，烟气经过与冷源换热进一步冷却，水蒸气冷凝后与CO2分离，烟气换热器出口的烟气通入干燥器中获得纯CO2气体；S3. The flue gas at the outlet of the CO 2 preheater is passed into the flue gas heat exchanger, the flue gas is further cooled by heat exchange with the cold source, and the water vapor is condensed and separated from CO 2 , and the flue gas at the outlet of the flue gas heat exchanger is further cooled. Pass the gas into the dryer to obtain pure CO 2 gas;
S4、所述干燥器出口的CO2气体通入低压压缩机中进行压缩，压缩至CO2加氢反应所需压力，低压压缩机出口的CO2气体通过三通阀进行分流为部分CO2和另一部分CO2；通过低压压缩机来控制通入CO2加氢反应器的CO2气体压力，进而控制CO2加氢反应；S4, the CO gas at the outlet of the dryer is passed into the low-pressure compressor for compression, compressed to the pressure required for the CO hydrogenation reaction, and the CO gas at the outlet of the low-pressure compressor is divided into a part of CO 2 and Another part of CO 2 ; control the CO 2 gas pressure fed into the CO 2 hydrogenation reactor through a low pressure compressor, and then control the CO 2 hydrogenation reaction;
S5、所述被分流的一部分CO2气体通入CO2加氢反应器中在催化剂条件下发生加氢反应，反应生成碳氢化合物；S5, a part of CO 2 gas that is shunted is passed into the CO 2 hydrogenation reactor to undergo a hydrogenation reaction under catalyst conditions, and the reaction generates hydrocarbons;
S6、所述被分流的另一部分CO2气体是回流CO2，回流CO2通入低压间冷换热器与冷源换热降温，降温后的CO2气体通入高压压缩机，高压压缩机出口的CO2气体通入高压间冷换热器与冷源换热进一步降温，高压间冷换热器出口的CO2气体通入泵中被进一步压缩升压至燃气轮机做功压力；S6. The other part of the shunted CO 2 gas is reflux CO 2 , and the reflux CO 2 is passed into the low-pressure intercooling heat exchanger to exchange heat with the cold source to cool down, and the cooled CO 2 gas is passed into the high-pressure compressor, and the high-pressure compressor The CO2 gas at the outlet is passed into the high-pressure intercooling heat exchanger to exchange heat with the cold source for further cooling, and the CO2 gas at the outlet of the high-pressure intercooling heat exchanger is passed into the pump to be further compressed and boosted to the working pressure of the gas turbine;
S7、所述泵输出的CO2气体通入加氢反应热回收换热器，通过冷媒与CO2加氢反应器进行换热升温，将CO2加氢反应释放的热量回收给回流CO2，加氢反应热回收换热器出口的回流CO2流至CO2预热器与烟气进行换热升温；S7, the CO 2 gas output by the pump is passed into the hydrogenation reaction heat recovery heat exchanger, and the heat exchange is carried out with the CO 2 hydrogenation reactor through the refrigerant to raise the temperature, and the heat released by the CO 2 hydrogenation reaction is recovered to the refluxing CO 2 , The reflux CO 2 at the outlet of the hydrogenation reaction heat recovery heat exchanger flows to the CO 2 preheater for heat exchange and heating with the flue gas;
S8、所述CO2预热器输出的回流CO2在燃气轮机中吸收燃气燃烧的热量，降低燃烧温度，保护汽轮机叶片以及CO2预热器，回流CO2与燃气燃烧生成的烟气掺混一起推动燃汽轮机做功发电。S8. The return CO 2 output from the CO 2 preheater absorbs the heat of gas combustion in the gas turbine, reduces the combustion temperature, protects the turbine blades and the CO 2 preheater, and the return CO 2 is mixed with the flue gas generated by the combustion of the gas Propel the gas turbine to generate power.
优选的，所述步骤S4中，通过三通阀来控制回流CO2流量，进而控制燃烧温度。Preferably, in the step S4, a three-way valve is used to control the flow rate of backflow CO 2 , thereby controlling the combustion temperature.
优选的，所述步骤S5中，CO2加氢反应器中通过加入不同的催化剂、设置不同反应条件，以产生不同的碳氢化合物。Preferably, in the step S5, different catalysts are added to the CO 2 hydrogenation reactor and different reaction conditions are set to generate different hydrocarbons.
优选的，当所述步骤S5产生的碳氢化合物为甲烷时，将所生成的甲烷通入燃气轮机中与氧气进行富氧燃烧。Preferably, when the hydrocarbon produced in the step S5 is methane, the produced methane is passed into the gas turbine for oxy-enriched combustion with oxygen.
优选的，为电解池提供的电能来自可再生能源发电、火力发电或者市政电网。Preferably, the electrical energy provided for the electrolytic cell comes from renewable energy power generation, thermal power generation or municipal power grid.
优选的，所述步骤S6中，通过控制低压间冷换热器、高压压缩机、高压间冷换热器使CO2在进入泵前是超临界状态。Preferably, in the step S6, by controlling the low-pressure intercooling heat exchanger, the high-pressure compressor, and the high-pressure intercooling heat exchanger, the CO 2 is in a supercritical state before entering the pump.
优选的，所述烟气换热器、低压间冷换热器、高压间冷换热器的冷源为热网回水、常温水或液态天然气；当冷源采用常温水时，换热升温后的常温水作为电解池供水；当冷源是液态天然气时，换热汽化后的天然气作为燃气轮机的燃料。Preferably, the cold source of the flue gas heat exchanger, the low-pressure inter-cooling heat exchanger and the high-pressure inter-cooling heat exchanger is the heat network return water, normal temperature water or liquid natural gas; when the cold source is normal temperature water, the heat exchange temperature rises The normal temperature water is used as the water supply for the electrolysis cell; when the cold source is liquid natural gas, the natural gas after heat exchange and vaporization is used as the fuel for the gas turbine.
优选的，所述烟气换热器、干燥器中的冷凝水作为电解池供水。Preferably, the condensed water in the flue gas heat exchanger and the dryer is used as water supply for the electrolysis cell.
本发明与现有技术相比，有益效果在于：Compared with the prior art, the present invention has the following beneficial effects:
1、本发明的系统在既有燃气电厂基础上设置电解池、若干换热装置以及压缩机，充分利用了电解水制氢生产过程的副产品氧气，将氧气作为天然气燃烧的助燃剂，在燃气轮机中氧气与天然气进行富氧燃烧，化学能转化为机械能再转化为电能输出，同时产生高温烟气，高温烟气中只有水蒸气和CO2，CO2浓度提高，分离难度下降，通过烟气降温可将大部分水蒸气冷凝下来、将CO2分离提纯；本发明的方法分离提纯CO2无需用到化学吸收、物理吸附、空气分离器等复杂设备，节省了设备成本以及运行成本；1. The system of the present invention is provided with an electrolytic cell, a number of heat exchange devices and a compressor on the basis of an existing gas-fired power plant, making full use of the by-product oxygen in the production process of electrolyzed water for hydrogen production, and using oxygen as a combustion-supporting agent for natural gas combustion, in the gas turbine. Oxygen and natural gas undergo oxy-fuel combustion, chemical energy is converted into mechanical energy and then converted into electrical energy output, and high-temperature flue gas is generated at the same time. There is only water vapor and CO 2 in the high-temperature flue gas. The concentration of CO 2 increases and the separation difficulty decreases. Most of the water vapor is condensed to separate and purify CO 2 ; the method of the present invention does not need to use complex equipment such as chemical absorption, physical adsorption, air separators, etc., and saves equipment costs and operating costs;
2、天然气富氧燃烧可以减少NOx的生成，节省减NOx排放的成本可补贴电厂减碳成本；2. Oxygen-enriched combustion of natural gas can reduce the generation of NOx , save the cost of reducing NOx emissions and subsidize the carbon reduction cost of power plants;
3、CO2加氢反应后生成附加值较高的化学产品，如甲醇、甲酸、甲烷等，可进一步补贴电厂减碳成本；3. After the CO 2 hydrogenation reaction, chemical products with higher added value are generated, such as methanol, formic acid, methane, etc., which can further subsidize the carbon reduction cost of power plants;
4、特别的，对于富氧燃烧的燃烧温度和烟气温度过高问题，设置CO2回流来控制；对于烟气余热回收热量与预热回流CO2 所需热量不匹配问题，设置CO2加氢反应放热量回收，避免需要额外热源；其他提高整体能源利用效率的还有CO2分流、多级压缩间冷、控制泵前CO2为超临界状态；以上技术保证方法的实践可靠性和提高整体能源利用率，节约能耗及运行成本。4. In particular, for the problem that the combustion temperature and flue gas temperature of the oxygen-enriched combustion are too high, set the CO 2 backflow to control; for the problem that the heat recovery heat of the flue gas waste heat does not match the heat required for the preheating reflux CO 2 , set the CO 2 plus Hydrogen reaction exothermic heat recovery, avoiding the need for additional heat sources; other ways to improve the overall energy utilization efficiency include CO 2 splitting, multi-stage compression intercooling, and controlling the CO 2 to be in a supercritical state before the pump; the above technologies ensure the practical reliability of the method and improve the Overall energy utilization, saving energy consumption and operating costs.
附图说明Description of drawings
图1是本发明实施例提供的一种含碳循环利用的燃气电厂低成本减碳排放系统的结构示意图。FIG. 1 is a schematic structural diagram of a low-cost carbon emission reduction system for a gas-fired power plant with carbon-containing recycling provided by an embodiment of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
在本发明的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制；术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性；此外，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个部件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention; the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise Clearly stipulated and defined, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or through The intermediary is indirectly connected, which can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.
请参看图1，示出了本发明提供的一较佳实施例，一种含碳循环利用的燃气电厂低成本减碳排放系统，包括电解池1、燃气轮机2、CO2预热器3、烟气换热器4、干燥器5、低压压缩机6、三通阀7、低压间冷换热器8、高压压缩机9、高压间冷换热器10、泵11、加氢反应热回收换热器12、CO2加氢反应器13。Please refer to FIG. 1, which shows a preferred embodiment provided by the present invention, a low-cost carbon emission reduction system for a gas-fired power plant with carbon-containing recycling, including an
电解池1中的水通过电解反应产生氧气与氢气，电解池1的氢气出口连接CO2加氢反应器13的氢气进口，电解池1的氧气出口连接燃气轮机2的氧气进口，燃气轮机2的烟气出口连接CO2预热器3的烟气进口，CO2预热器3的烟气出口连接烟气换热器4的烟气进口，烟气换热器4的烟气出口连接干燥器5的烟气进口，干燥器5的CO2出口连接低压压缩机6的CO2进口，低压压缩机6的输出的CO2通过三通阀7进行分流为部分CO2和另一部分CO2；The water in the
三通阀7的一个出口与低压间冷换热器8的CO2进口连接，所述被分流的一部分CO2流至低压间冷换热器8的CO2进口，低压间冷换热器8的CO2出口连接高压压缩机9进口，高压压缩机9出口的CO2连接高压间冷换热器10的CO2进口，高压间冷换热器10的CO2出口连接泵11的CO2进口，泵11的CO2出口连接加氢反应热回收换热器12的CO2进口，加氢反应热回收换热器12的CO2出口连接CO2预热器3的CO2进口，CO2预热器3的CO2出口连接燃气轮机2的CO2回流进口。One outlet of the three-way valve 7 is connected to the CO 2 inlet of the low-pressure
三通阀7的另一个出口与CO2加氢反应器13的CO2进口连接，所述被分流的另一部分CO2流至CO2加氢反应器13的CO2进口。The other outlet of the three-way valve 7 is connected to the CO 2 inlet of the CO 2 hydrogenation reactor 13 , and the other part of the
本实施例还提供了上述系统实现低成本减碳排放的方法，包括以下步骤：This embodiment also provides a method for the above-mentioned system to achieve low-cost carbon emission reduction, including the following steps:
S1、所述电解池1中的水发生电化学反应产生氢气与氧气，为电解池1提供的电能来自可再生能源发电、火力发电或者市政电网。氧气通入燃气轮机2作为助燃剂，在燃气轮机2中氧气与天然气进行富氧燃烧，化学能转化为机械能再转化为电能输出，同时产生包含水蒸气和CO2的高温烟气；S1. The water in the
S2、所述高温烟气通入CO2预热器3中与回流CO2进行换热；S2, the high temperature flue gas is passed into the CO 2 preheater 3 to exchange heat with the refluxing CO 2 ;
S3、所述CO2预热器3出口的烟气通入烟气换热器4中，烟气经过与冷源换热进一步冷却，水蒸气冷凝后与CO2分离，烟气换热器4出口的烟气通入干燥器5中获得纯CO2气体；S3, the flue gas at the outlet of the CO 2 preheater 3 is passed into the flue gas heat exchanger 4, the flue gas is further cooled by heat exchange with the cold source, and the water vapor is condensed and separated from CO 2 , the flue gas heat exchanger 4 The flue gas from the outlet is passed into the
S4、所述干燥器5出口的CO2气体通入低压压缩机6中进行压缩，压缩至CO2加氢反应所需压力，低压压缩机6出口的CO2气体通过三通阀7进行分流为两部分CO2；通过低压压缩机6来控制通入CO2加氢反应器13的CO2气体压力，进而控制CO2加氢反应；S4, the CO gas at the outlet of the
S5、所述被分流的一部分CO2气体通入CO2加氢反应器13中在催化剂条件下发生加氢反应，反应生成碳氢化合物；CO2加氢反应器13中通过加入不同的催化剂、设置不同反应条件，以产生不同的碳氢化合物；当产生的碳氢化合物为甲烷时，将所生成的甲烷通入燃气轮机2中与氧气进行富氧燃烧；S5, a part of CO 2 gas that is divided into the CO 2 hydrogenation reactor 13 to undergo a hydrogenation reaction under catalyst conditions, and the reaction generates hydrocarbons; in the CO 2 hydrogenation reactor 13, by adding different catalysts, Different reaction conditions are set to generate different hydrocarbons; when the generated hydrocarbons are methane, the generated methane is fed into the
S6、所述被分流的另一部分CO2气体是回流CO2，回流CO2通入低压间冷换热器8与冷源换热降温，降温后的CO2气体通入高压压缩机9，高压压缩机9出口的CO2气体通入高压间冷换热器10与冷源换热进一步降温，高压间冷换热器10出口的CO2气体通入泵11中被进一步压缩升压至燃气轮机2做功压力；通过控制低压间冷换热器8、高压压缩机9、高压间冷换热器10使CO2在进入泵11前是超临界状态。优选的，所述烟气换热器4、低压间冷换热器8、高压间冷换热器10的冷源为热网回水、常温水或液态天然气；当冷源采用常温水时，换热升温后的常温水作为电解池1供水；当冷源是液态天然气时，换热汽化后的天然气作为燃气轮机2的燃料；S6. The other part of the shunted CO 2 gas is reflux CO 2 , and the reflux CO 2 is passed into the low-pressure
S7、所述泵11出口的CO2气体通入加氢反应热回收换热器12，通过水等冷媒与CO2加氢反应器13进行换热升温，将CO2加氢反应释放的热量回收给回流CO2，加氢反应热回收换热器12出口的回流CO2流至CO2预热器13与烟气进行换热升温；S7, the CO2 gas at the outlet of the pump 11 is passed into the hydrogenation reaction heat
S8、所述CO2预热器3出口的回流CO2在燃气轮机2中吸收燃气燃烧热，降低燃烧温度，保护汽轮机叶片以及CO2预热器的材料，回流CO2与燃气燃烧生成的烟气掺混一起推动燃汽轮机2做功发电。S8. The backflow CO2 at the outlet of the CO2 preheater 3 absorbs the combustion heat of the gas in the
本实施例的系统在既有燃气电厂基础上设置电解池、若干换热器和压缩机，利用电解水过程产生的氢气和氧气，氧气通入燃气发电装置使天然气进行富氧燃烧，产生只有水蒸气和CO2的烟气，烟气通过烟气余热回收装置将水蒸气冷凝、与CO2分离。分离后的CO2部分回流、经与烟气换热后通至燃气轮机，部分与氢气进行加氢反应，生成高附加值的碳氢化合物产品。In the system of this embodiment, an electrolytic cell, several heat exchangers and compressors are set up on the basis of the existing gas-fired power plant, and the hydrogen and oxygen produced in the process of electrolysis of water are used. The flue gas of steam and CO 2 , the flue gas is condensed and separated from CO 2 through the flue gas waste heat recovery device. The separated CO2 is partially refluxed, passed to the gas turbine after heat exchange with the flue gas, and partially hydrogenated with hydrogen to generate high value-added hydrocarbon products.
本实施例的方法捕获烟气中CO2无需用到化学吸收、物理吸附、空气分离器等复杂设备，节省了设备成本以及运行成本；天然气富氧燃烧可以减少NOx的生成，节省减NOx排放的成本可补贴电厂减碳成本；并且CO2加氢反应后生成附加值较高的化学产品，可进一步补贴电厂减碳成本。特别对于富氧燃烧的燃烧温度和烟气温度过高问题，设置CO2回流来控制；对于烟气余热回收热量与预热回流CO2 所需热量不匹配问题，设置CO2加氢反应放热量回收，避免需要额外热源；其他提高整体能源利用效率的还有CO2分流、多级压缩间冷、控制泵前CO2为超临界状态，以上技术保证方法的实践可靠性和提高整体能源利用率，进一步节约能耗及运行成本。The method of this embodiment does not require complex equipment such as chemical absorption, physical adsorption, air separators, etc. to capture CO 2 in flue gas, which saves equipment costs and operating costs; the oxygen-enriched combustion of natural gas can reduce the generation of NO x and save NO x The cost of emissions can subsidize the carbon reduction cost of the power plant; and the CO 2 hydrogenation reaction produces higher value-added chemical products, which can further subsidize the carbon reduction cost of the power plant. Especially for the problem of high combustion temperature and flue gas temperature of oxygen-enriched combustion, CO 2 reflux is set to control; for the problem of mismatch between the heat recovery heat of flue gas waste heat and the heat required for preheating reflux CO 2 , set the exothermic heat of CO 2 hydrogenation reaction Recycling to avoid the need for additional heat sources; other ways to improve the overall energy utilization efficiency include CO 2 splitting, multi-stage inter-compression cooling, and controlling the CO 2 before the pump to be in a supercritical state. The above technologies ensure the practical reliability of the method and improve the overall energy utilization rate. , to further save energy consumption and operating costs.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.
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