CN210385368U - Carbon dioxide capture system based on power supply of coal-fired steam injection boiler system - Google Patents

Carbon dioxide capture system based on power supply of coal-fired steam injection boiler system Download PDF

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CN210385368U
CN210385368U CN201920978025.7U CN201920978025U CN210385368U CN 210385368 U CN210385368 U CN 210385368U CN 201920978025 U CN201920978025 U CN 201920978025U CN 210385368 U CN210385368 U CN 210385368U
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boiler
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陆诗建
李清方
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Sinopec Oilfield Service Corp
Sinopec Jianghan Petroleum Engineering Design Co Ltd
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Sinopec Energy and Environmental Engineering Co Ltd
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Abstract

本实用新型提供了一种基于燃煤注汽锅炉系统供电的二氧化碳捕集系统,其包括吸收塔、富液泵、贫富液换热器、解吸塔、贫液泵、贫液冷却器、燃煤注汽锅炉系统、汽轮发电机、煮沸器。其中,除盐水吸热升温,然后经由贫液冷却器第一出口进入燃煤注汽锅炉系统中;除盐水在燃煤注汽锅炉系统中变为高温高压蒸汽,一部分高温高压蒸汽通入汽轮发电机中,在汽轮发电机中高温高压蒸汽转变为电能和低温低压蒸汽,汽轮发电机电连接富液泵和贫液泵,以对富液泵和贫液泵提供电能;低温低压蒸汽进入煮沸器中与解吸塔底的部分液体进行第三热交换。汽轮发电机产生的电能可用于富液泵和贫液泵的供电,从而节省了富液泵和贫液泵额外消耗的电能,降低了捕集成本。

Figure 201920978025

The utility model provides a carbon dioxide capture system powered by a coal-fired steam injection boiler system, which comprises an absorption tower, a rich liquid pump, a lean and rich liquid heat exchanger, a desorption tower, a lean liquid pump, a lean liquid cooler, a Coal steam injection boiler system, turbine generator, boiler. Among them, the demineralized water absorbs heat and heats up, and then enters the coal-fired steam injection boiler system through the first outlet of the lean liquid cooler; the demineralized water turns into high-temperature and high-pressure steam in the coal-fired steam-injection boiler system, and part of the high-temperature and high-pressure steam is passed into the steam turbine In the generator, the high-temperature and high-pressure steam is converted into electric energy and low-temperature and low-pressure steam in the turbo-generator, and the turbo-generator is electrically connected to the rich liquid pump and the lean liquid pump to provide electrical energy to the rich liquid pump and the lean liquid pump; the low temperature and low pressure steam enters A third heat exchange occurs in the boiler with a portion of the liquid at the bottom of the desorption column. The electric energy generated by the turbo-generator can be used for power supply of the rich liquid pump and the lean liquid pump, thereby saving the extra electric energy consumed by the rich liquid pump and the lean liquid pump, and reducing the capture cost.

Figure 201920978025

Description

基于燃煤注汽锅炉系统供电的二氧化碳捕集系统Carbon dioxide capture system powered by coal-fired steam injection boiler system

技术领域technical field

本实用新型涉及二氧化碳捕集领域,尤其涉及一种基于燃煤注汽锅炉系统供电的二氧化碳捕集系统。The utility model relates to the field of carbon dioxide capture, in particular to a carbon dioxide capture system powered by a coal-fired steam injection boiler system.

背景技术Background technique

由于化石燃料的大量燃烧,大气中CO2的含量也不断上升,大量CO2的排放导致温室效应越来越严重,给全球的生态平衡和人类社会的发展带来了不可忽视的负面影响。Due to the massive combustion of fossil fuels, the content of CO 2 in the atmosphere is also rising, and the emission of a large amount of CO 2 has led to an increasingly serious greenhouse effect, which has brought negative impacts to the global ecological balance and the development of human society that cannot be ignored.

CO2减排主要有三种方式,第一种是提高能效,提高设备和工艺的能效可以有效的减少CO2的排放。第二种是寻找替代能源,新能源的发现和清洁能源的利用可以减少化石能源的使用从而有效的减小CO2的排放。第三种是对CO2进行捕集和封存(CCS)。前两种方式很难在短时间内有突破性的发展,而对排出的CO2进行捕集和封存已经成为减小大气中CO2排放的最直接最有效的方式。There are three main ways to reduce CO 2 emissions. The first is to improve energy efficiency. Improving the energy efficiency of equipment and processes can effectively reduce CO 2 emissions. The second is to look for alternative energy sources. The discovery of new energy sources and the utilization of clean energy can reduce the use of fossil energy and thus effectively reduce CO 2 emissions. The third is CO capture and storage (CCS). It is difficult for the first two methods to achieve breakthrough development in a short period of time, and the capture and storage of exhausted CO 2 has become the most direct and effective way to reduce CO 2 emissions in the atmosphere.

目前利用有机胺捕集CO2技术是目前最成熟的技术,有机胺法捕集CO2技术的主要不足之处是解吸塔再生能耗过高,为了更有效地减少CO2排放,开发新的CO2捕集系统,国内外学者正不断对现有流程进行优化与开发。At present, the use of organic amines to capture CO2 technology is the most mature technology at present. The main disadvantage of the organic amine method to capture CO2 technology is that the energy consumption of desorption tower regeneration is too high. In order to reduce CO2 emissions more effectively, new For CO 2 capture systems, domestic and foreign scholars are constantly optimizing and developing existing processes.

然而燃煤注汽锅炉是烟气CO2捕集技术的“蓝海”,目前尚未有示范工程建设,也未有具体的技术成果发布。However, coal-fired steam injection boilers are the "blue ocean" of flue gas CO 2 capture technology. At present, there is no demonstration project construction, and no specific technical achievements have been released.

实用新型内容Utility model content

鉴于背景技术中存在的问题,本实用新型的目的在于提供一种基于燃煤注汽锅炉系统供电的二氧化碳捕集系统,其将蒸汽发电技术用于二氧化碳以及吸收剂的再生,同时有效利用解吸塔中二氧化碳和吸收剂再生产生的废热来加热注入燃煤注汽锅炉系统内的补给水,从而能够降低二氧化碳捕集成本和锅炉煤耗。In view of the problems existing in the background technology, the purpose of the present utility model is to provide a carbon dioxide capture system powered by a coal-fired steam injection boiler system, which uses the steam power generation technology for the regeneration of carbon dioxide and absorbent, while effectively utilizing the desorption tower. The waste heat generated by the regeneration of carbon dioxide and the absorbent is used to heat the make-up water injected into the coal-fired steam injection boiler system, thereby reducing the cost of carbon dioxide capture and boiler coal consumption.

为了实现上述目的,本实用新型提供了一种基于燃煤注汽锅炉系统供电的二氧化碳捕集系统,其包括吸收塔、富液泵、贫富液换热器、解吸塔、贫液泵、贫液冷却器、燃煤注汽锅炉系统、汽轮发电机、煮沸器。In order to achieve the above purpose, the present invention provides a carbon dioxide capture system powered by a coal-fired steam injection boiler system, which includes an absorption tower, a rich liquid pump, a lean and rich liquid heat exchanger, a desorption tower, a lean liquid pump, a lean liquid pump, and a lean liquid pump. Liquid coolers, coal-fired steam injection boiler systems, turbine generators, boilers.

吸收塔包括:吸收塔第一入口,位于吸收塔的下部,供烟气进入;吸收塔第二入口,位于吸收塔的上部;吸收塔第一出口,位于吸收塔的底部;吸收塔第二出口,位于吸收塔的顶部。The absorption tower includes: the first inlet of the absorption tower, located at the lower part of the absorption tower, for the entry of flue gas; the second inlet of the absorption tower, located at the upper part of the absorption tower; the first outlet of the absorption tower, located at the bottom of the absorption tower; the second outlet of the absorption tower , located at the top of the absorption tower.

贫富液换热器包括:贫富液换热器第一入口;贫富液换热器第二入口;贫富液换热器第一出口;贫富液换热器第二出口。The lean-rich liquid heat exchanger includes: a first inlet of the lean-rich liquid heat exchanger; a second inlet of the lean-rich liquid heat exchanger; a first outlet of the lean-rich liquid heat exchanger; and a second outlet of the lean-rich liquid heat exchanger.

富液泵的一侧连通于吸收塔第一出口,另一侧连通于贫富液换热器第一入口。One side of the rich liquid pump is connected to the first outlet of the absorption tower, and the other side is connected to the first inlet of the lean-rich liquid heat exchanger.

解吸塔包括:解吸塔第一入口,位于解吸塔的上部,连通贫富液换热器第一出口;解吸塔第二入口,位于解吸塔的底部;解吸塔第一出口,位于解吸塔的底部;解吸塔第二出口,位于解吸塔的顶部;解吸塔第三出口,位于解吸塔的下部。The desorption tower includes: the first inlet of the desorption tower, located at the upper part of the desorption tower, connected to the first outlet of the lean-rich liquid heat exchanger; the second inlet of the desorption tower, located at the bottom of the desorption tower; the first outlet of the desorption tower, located at the bottom of the desorption tower ; The second outlet of the desorption tower is located at the top of the desorption tower; the third outlet of the desorption tower is located at the lower part of the desorption tower.

贫液泵的一侧连通于解吸塔第一出口,另一侧连通于贫富液换热器第二入口。One side of the lean liquid pump is connected to the first outlet of the desorption tower, and the other side is connected to the second inlet of the lean and rich liquid heat exchanger.

贫液冷却器包括:贫液冷却器第一入口,连通贫富液换热器第二出口;贫液冷却器第二入口,供外部除盐水进入;贫液冷却器第一出口,连通于燃煤注汽锅炉系统;贫液冷却器第二出口,连通于吸收塔第二入口。The lean liquid cooler includes: the first inlet of the lean liquid cooler, which is connected to the second outlet of the lean and rich liquid heat exchanger; the second inlet of the lean liquid cooler is for the entry of external demineralized water; the first outlet of the lean liquid cooler is connected to the fuel Coal steam injection boiler system; the second outlet of the lean liquid cooler is connected to the second inlet of the absorption tower.

汽轮发电机包括:汽轮发电机蒸汽入口,连通于燃煤注汽锅炉系统;汽轮发电机蒸汽出口;汽轮发电机发电接口,分别电连接于富液泵、贫液泵。The steam turbine generator comprises: the steam inlet of the steam turbine generator, which is connected to the coal-fired steam injection boiler system; the steam outlet of the steam turbine generator;

煮沸器包括:煮沸器第一入口,连通于汽轮发电机蒸汽出口;煮沸器第二入口,连通于解吸塔第三出口;煮沸器第一出口,连通于燃煤注汽锅炉系统;煮沸器第二出口,连通于解吸塔第二入口。The boiler includes: the first inlet of the boiler, which is connected to the steam outlet of the steam turbine generator; the second inlet of the boiler, which is connected to the third outlet of the desorption tower; the first outlet of the boiler, which is connected to the coal-fired steam injection boiler system; the boiler The second outlet is connected to the second inlet of the desorption tower.

其中,烟气经由吸收塔第一入口进入吸收塔中且从下往上运动,吸收剂经由吸收塔第二入口进入吸收塔中且往下喷淋,往下喷淋的吸收剂与烟气逆流接触,从而吸收剂吸收烟气中的二氧化碳而变为富液,富液向下沉降,脱除了二氧化碳的烟气继续向上运动并经由吸收塔第二出口排出;富液经由富液泵从吸收塔第一出口、贫富液换热器第一入口泵入到贫富液换热器中进行第一热交换,富液吸热升温;The flue gas enters the absorption tower through the first inlet of the absorption tower and moves from bottom to top, the absorbent enters the absorption tower through the second inlet of the absorption tower and is sprayed downward, and the absorbent sprayed downward is countercurrent to the flue gas contact, so that the absorbent absorbs carbon dioxide in the flue gas and becomes rich liquid, the rich liquid settles down, and the flue gas from which carbon dioxide has been removed continues to move upward and is discharged through the second outlet of the absorption tower; the rich liquid passes through the rich liquid pump from the absorption tower. The first outlet and the first inlet of the lean-rich liquid heat exchanger are pumped into the lean-rich liquid heat exchanger for the first heat exchange, and the rich liquid absorbs heat to heat up;

完成第一热交换的富液经由贫富液换热器第一出口、解吸塔第一入口进入解吸塔中,富液在解吸塔中被加热解吸并分解为贫液和二氧化碳,贫液在解吸塔中向下沉降,二氧化碳向上运动并经由解吸塔第二出口排出;The rich liquid that has completed the first heat exchange enters the desorption tower through the first outlet of the lean-rich liquid heat exchanger and the first inlet of the desorption tower. The rich liquid is heated and desorbed in the desorption tower and decomposed into lean liquid and carbon dioxide. The tower settles downward, and the carbon dioxide moves upward and is discharged through the second outlet of the desorption tower;

解吸塔中解吸出的贫液经由贫液泵从解吸塔第一出口、贫富液换热器第二入口泵入到贫富液换热器中,与经由贫富液换热器第一入口进入的富液进行前述的第一热交换,贫液放热降温;The lean liquid desorbed from the desorption tower is pumped into the lean and rich liquid heat exchanger from the first outlet of the desorption tower and the second inlet of the lean and rich liquid heat exchanger through the lean liquid pump, and is pumped into the lean and rich liquid heat exchanger through the lean liquid pump, and is passed through the first inlet of the lean and rich liquid heat exchanger. The incoming rich liquid is subjected to the aforementioned first heat exchange, and the lean liquid is exothermic and cooled;

完成第一热交换的贫液经由贫富液换热器第二出口、贫液冷却器第一入口进入贫液冷却器中,与经由贫液冷却器第二入口进入的除盐水进行第二热交换,贫液再次放热降温,降温后的贫液经由贫液冷却器第二出口、吸收塔第二入口进入吸收塔中作为前述吸收剂使用;The lean liquid that has completed the first heat exchange enters the lean liquid cooler through the second outlet of the lean-rich liquid heat exchanger and the first inlet of the lean liquid cooler, and conducts second heat with the demineralized water entering through the second inlet of the lean liquid cooler. Exchange, the lean liquid is exothermic and cooled again, and the cooled lean liquid enters the absorption tower through the second outlet of the lean liquid cooler and the second inlet of the absorption tower to be used as the aforementioned absorbent;

经由贫液冷却器第二入口进入的除盐水吸热升温,吸热升温后的除盐水经由贫液冷却器第一出口进入燃煤注汽锅炉系统中,以作为燃煤注汽锅炉系统的补给水使用;The demineralized water entering through the second inlet of the lean liquid cooler absorbs heat and heats up, and the demineralized water after the endothermic temperature rises enters the coal-fired steam injection boiler system through the first outlet of the lean liquid cooler, as a supply to the coal-fired steam injection boiler system water use;

补给水在燃煤注汽锅炉系统的作用下变为高温高压蒸汽,一部分高温高压蒸汽通入汽轮发电机中,在汽轮发电机中高温高压蒸汽转变为电能和低温低压蒸汽,汽轮发电机的汽轮发电机发电接口电连接富液泵和贫液泵,以对富液泵和贫液泵提供电能;The make-up water becomes high-temperature and high-pressure steam under the action of the coal-fired steam injection boiler system, and a part of the high-temperature and high-pressure steam is passed into the turbine generator, where the high-temperature and high-pressure steam is converted into electric energy and low-temperature and low-pressure steam, and the turbine generates electricity. The steam turbine generator power generation interface of the engine is electrically connected to the rich liquid pump and the lean liquid pump to provide electrical energy to the rich liquid pump and the lean liquid pump;

低温低压蒸汽经由汽轮发电机蒸汽出口、煮沸器第一入口进入煮沸器中进行第三热交换;The low-temperature and low-pressure steam enters the boiler through the steam outlet of the steam turbine generator and the first inlet of the boiler for the third heat exchange;

解吸塔底的部分液体经由解吸塔第三出口、煮沸器第二入口进入煮沸器中,与经由煮沸器第一入口进入煮沸器的低温低压蒸汽进行前述第三热交换,所述部分液体在煮沸器中吸热升温而被部分汽化并由煮沸器第二出口、解吸塔第二入口进入解吸塔中,以为解吸塔中的富液解吸提供蒸汽和热量;煮沸器中低温低压蒸汽放热降温而变为凝结水,凝结水经由煮沸器第一出口进入到燃煤注汽锅炉系统中,以作为燃煤注汽锅炉系统的补给水使用。Part of the liquid at the bottom of the desorption tower enters the boiler through the third outlet of the desorption tower and the second inlet of the boiler, and performs the third heat exchange with the low-temperature and low-pressure steam entering the boiler through the first inlet of the boiler, and the part of the liquid is boiled. The boiler absorbs heat and heats up and is partially vaporized and enters into the desorption tower from the second outlet of the boiler and the second inlet of the desorption tower to provide steam and heat for the desorption of the rich liquid in the desorption tower; It becomes condensed water, and the condensed water enters the coal-fired steam injection boiler system through the first outlet of the boiler to be used as the make-up water of the coal-fired steam injection boiler system.

在一实施例中,燃煤注汽锅炉系统包括锅炉除氧器、锅炉汽包和注汽锅炉本体。In one embodiment, a coal-fired steam injection boiler system includes a boiler deaerator, a boiler drum and a steam injection boiler body.

锅炉除氧器包括:锅炉除氧器第一入口,连通贫液冷却器第一出口;锅炉除氧器出口。The boiler deaerator includes: the first inlet of the boiler deaerator, which is connected to the first outlet of the lean liquid cooler; and the outlet of the boiler deaerator.

锅炉汽包包括:锅炉汽包第一入口,连通锅炉除氧器出口;锅炉汽包出口。The boiler steam drum includes: the first inlet of the boiler steam drum, which is connected to the outlet of the boiler deaerator; and the outlet of the boiler steam drum.

注汽锅炉本体包括:注汽锅炉本体入口,连通锅炉汽包出口;注汽锅炉本体第一出口,连通汽轮发电机蒸汽入口;注汽锅炉本体第二出口。The steam injection boiler body includes: an inlet of the steam injection boiler body, which is connected to the boiler steam drum outlet; a first outlet of the steam injection boiler body, which is connected to the steam inlet of the steam turbine generator; and a second outlet of the steam injection boiler body.

其中,经由贫液冷却器第二入口进入的除盐水进行前述第二热交换后吸热升温,吸热升温的除盐水经由贫液冷却器第一出口、锅炉除氧器第一入口进入锅炉除氧器中进行除氧处理,脱氧的除盐水经由锅炉除氧器出口、锅炉汽包第一入口进入锅炉汽包中被汽化而变为蒸汽;蒸汽经由锅炉汽包出口、注汽锅炉本体入口进入注汽锅炉本体中,蒸汽在注汽锅炉本体中被加热而成为高温高压蒸汽,前述的一部分高温高压蒸汽经由注汽锅炉本体第一出口、汽轮发电机蒸汽入口进入汽轮发电机中,以向汽轮发电机提供蒸汽;另一部分高温高压蒸汽经由注汽锅炉本体第二出口流向外界。Wherein, the demineralized water entering through the second inlet of the lean liquid cooler undergoes the aforementioned second heat exchange and then endothermic temperature rises, and the demineralized water that has endothermic temperature rise enters the boiler deaerator through the first outlet of the lean liquid cooler and the first inlet of the boiler deaerator. The deoxygenation treatment is carried out in the deaerator, and the deoxidized demineralized water enters the boiler steam drum through the outlet of the boiler deaerator and the first inlet of the boiler steam drum and is vaporized into steam; the steam enters through the outlet of the boiler steam drum and the inlet of the steam injection boiler body. In the steam injection boiler body, the steam is heated in the steam injection boiler body to become high-temperature and high-pressure steam. Provide steam to the steam turbine generator; another part of the high temperature and high pressure steam flows to the outside through the second outlet of the steam injection boiler body.

在一实施例中,锅炉除氧器还包括:锅炉除氧器第二入口。In one embodiment, the boiler deaerator further comprises: a second inlet of the boiler deaerator.

基于燃煤注汽锅炉系统供电的二氧化碳捕集系统还包括再生气冷却器、压缩机、压缩气冷却器。The carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system also includes a regeneration gas cooler, a compressor, and a compressed gas cooler.

再生气冷却器包括:再生气冷却器第一入口,连通解吸塔第二出口;再生气冷却器第二入口,供外部除盐水进入;再生气冷却器第一出口,连通锅炉除氧器第二入口;再生气冷却器第二出口。The regeneration gas cooler includes: the first inlet of the regeneration gas cooler, which is connected to the second outlet of the desorption tower; the second inlet of the regeneration gas cooler, for the entry of external demineralized water; the first outlet of the regeneration gas cooler, which is connected to the second outlet of the boiler deaerator Inlet; second outlet of regeneration gas cooler.

压缩机包括:压缩机入口,连通再生气冷却器第二出口;压缩机出口。The compressor includes: an inlet of the compressor, which is communicated with the second outlet of the regenerating gas cooler; and an outlet of the compressor.

压缩气冷却器包括:压缩气冷却器第一入口,连通压缩机出口;压缩气冷却器第二入口,供外部除盐水进入;压缩气冷却器第一出口;压缩气冷却器第二出口,连通锅炉除氧器第二入口。The compressed gas cooler includes: a first inlet of the compressed gas cooler, which is connected to the compressor outlet; a second inlet of the compressed gas cooler, which is used for external demineralized water to enter; a first outlet of the compressed gas cooler; and a second outlet of the compressed gas cooler, which is communicated with The second inlet of the boiler deaerator.

其中,经由解吸塔第二出口排出的二氧化碳经由再生气冷却器第一入口进入再生气冷却器中,与经由再生气冷却器第二入口进入的除盐水进行第四热交换,Wherein, the carbon dioxide discharged through the second outlet of the desorption tower enters the regeneration gas cooler through the first inlet of the regeneration gas cooler, and performs a fourth heat exchange with the demineralized water entering through the second inlet of the regeneration gas cooler,

二氧化碳放热降温然后经由再生气冷却器第二出口、压缩机入口进入压缩机中,二氧化碳被压缩机压缩增压,增压后的二氧化碳经由压缩机出口、压缩气冷却器第一入口进入压缩气冷却器中进行第五热交换,二氧化碳再次放热降温,然后经由压缩气冷却器第一出口排出;The carbon dioxide releases heat and cools down, and then enters the compressor through the second outlet of the regenerating gas cooler and the compressor inlet. The carbon dioxide is compressed and pressurized by the compressor, and the pressurized carbon dioxide enters the compressed gas through the compressor outlet and the first inlet of the compressed air cooler. The fifth heat exchange is carried out in the cooler, and the carbon dioxide exotherms and cools down again, and is then discharged through the first outlet of the compressed air cooler;

经由再生气冷却器第二入口进入的除盐水与经由再生气冷却器第一入口进入的二氧化碳进行前述第四热交换,除盐水吸热升温然后经由再生气冷却器第一出口、锅炉除氧器第二入口进入锅炉除氧器中进行除氧,脱氧后的除盐水经由锅炉除氧器出口、锅炉汽包入口进入锅炉汽包中,以作为补给水使用;The demineralized water entering through the second inlet of the regenerating gas cooler and the carbon dioxide entering through the first inlet of the regenerating gas cooler perform the aforementioned fourth heat exchange, the demineralized water absorbs heat and raises the temperature and then passes through the first outlet of the regenerating gas cooler and the boiler deaerator The second inlet enters the boiler deaerator for deoxidation, and the deoxidized demineralized water enters the boiler steam drum through the outlet of the boiler deaerator and the inlet of the boiler drum to be used as make-up water;

经由压缩气冷却器第二入口进入的除盐水与经由压缩气冷却器第一入口进入的二氧化碳进行前述第五热交换,除盐水吸热升温然后经由压缩气冷却器第二出口、锅炉除氧器第二入口进入锅炉除氧器中进行除氧,脱氧后的除盐水经由锅炉除氧器出口、锅炉汽包入口进入锅炉汽包中,以作为补给水使用。The demineralized water entering through the second inlet of the compressed gas cooler and the carbon dioxide entering through the first inlet of the compressed gas cooler perform the aforementioned fifth heat exchange, the demineralized water absorbs heat and warms up and then passes through the second outlet of the compressed gas cooler, the boiler deaerator The second inlet enters the boiler deaerator for deoxidation, and the deoxidized demineralized water enters the boiler steam drum through the outlet of the boiler deaerator and the inlet of the boiler drum to be used as make-up water.

在一实施例中,汽轮发电机的汽轮发电机发电接口还电连接于压缩机,以向压缩机供电。In one embodiment, the turbo-generator power generation interface of the turbo-generator is also electrically connected to the compressor to supply power to the compressor.

在一实施例中,锅炉汽包还包括锅炉汽包第二入口,锅炉汽包第二入口与煮沸器第一出口连通;其中,经由煮沸器第一出口排出的凝结水通过锅炉汽包第二入口进入锅炉汽包中,以作为锅炉汽包的补给水使用。In one embodiment, the boiler steam drum further comprises a second inlet of the boiler steam drum, and the second inlet of the boiler steam drum communicates with the first outlet of the boiler; wherein, the condensed water discharged through the first outlet of the boiler passes through the second inlet of the boiler steam drum. The inlet enters the boiler steam drum to be used as the make-up water for the boiler steam drum.

在一实施例中,燃煤锅炉的二氧化碳捕集系统还包括引风机。引风机包括:引风机入口,供外部烟气进入;引风机出口,连通吸收塔第一入口;其中,外部的烟气经由引风机入口进入到引风机中,然后经由引风机出口、吸收塔第一入口进入到吸收塔中。In one embodiment, the carbon dioxide capture system of the coal-fired boiler further includes an induced draft fan. The induced draft fan includes: the induced draft fan inlet, which is used for the entry of external flue gas; the induced draft fan outlet, which is connected to the first inlet of the absorption tower; wherein, the external flue gas enters the induced draft fan through the induced draft fan inlet, and then passes through the induced draft fan outlet and the absorption tower. An inlet goes into the absorption tower.

在一实施例中,汽轮发电机的汽轮发电机发电接口还电连接于引风机,以向引风机供电。In one embodiment, the turbo-generator power generation interface of the turbo-generator is also electrically connected to the induced draft fan to supply power to the induced draft fan.

在一实施例中,引风机入口连通于燃煤注汽锅炉系统,以使燃煤注汽锅炉系统产生的烟气经由引风机进入吸收塔以进行二氧化碳的捕集。In one embodiment, the inlet of the induced draft fan is connected to the coal-fired steam injection boiler system, so that the flue gas generated by the coal-fired steam injection boiler system enters the absorption tower through the induced draft fan for carbon dioxide capture.

本实用新型的有益效果如下:The beneficial effects of the present utility model are as follows:

在根据本实用新型的基于燃煤注汽锅炉系统供电的二氧化碳捕集系统中,完成第一热交换的贫液仍具有较高的热量,完成第一热交换的贫液在贫液冷却器中与经由贫液冷却器第二入口流入的除盐水进行第二热交换,贫液继续放热降温,除盐水吸热升温,吸热升温的除盐水流入到燃煤注汽锅炉系统中作为补给水使用,这一换热过程有效地回收了贫液的废热,且吸热升温的除盐水减少了燃煤注汽锅炉系统在加热补给水过程的耗煤量,进而降低了基于燃煤注汽锅炉系统供电的二氧化碳捕集系统捕集二氧化碳的成本;此外,燃煤注汽锅炉系统向汽轮发电机输出高温高压蒸汽,汽轮发电机将高温高压蒸汽转变为电能和低温低压蒸汽,富液泵和贫液泵电连接汽轮发电机发电接口,汽轮发电机产生的电能可用于富液泵和贫液泵的供电,从而节省了捕集二氧化碳过程中富液泵和贫液泵额外消耗的电能,降低了捕集成本;再者,产生的低温低压蒸汽直接通入到煮沸器中,并在煮沸器中与经由煮沸器第二入口进入的液体进行热交换,使得汽轮发电机产生的低温低压蒸汽得到了有效的回收利用,同时避免了额外向煮沸器提供蒸汽所消耗的能耗,节约了捕集成本;此外,低温低压蒸汽在煮沸器中放热降温后变为凝结水,凝结水直接注入到燃煤注汽锅炉系统中作为补给水使用,有效地回收、利用了废水,同时补给水在燃煤注汽锅炉系统需要加热转变为蒸汽,而凝结水相对于普通的锅炉补给水而言,具有较高的温度,具有较高温度的凝结水在燃煤注汽锅炉系统中转变为蒸汽的过程煤耗相比于普通的补给水更少,由此,凝结水的回收利用还降低了燃煤注汽锅炉系统的能耗,节约了成本。In the carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system according to the present invention, the lean liquid that has completed the first heat exchange still has relatively high heat, and the lean liquid that has completed the first heat exchange is stored in the lean liquid cooler. The second heat exchange is carried out with the demineralized water flowing in through the second inlet of the lean liquid cooler, the lean liquid continues to release heat to cool down, the demineralized water absorbs heat to heat up, and the demineralized water that absorbs heat and heats up flows into the coal-fired steam injection boiler system as make-up water Use, this heat exchange process effectively recovers the waste heat of the lean liquid, and the demineralized water that absorbs heat and increases the temperature reduces the coal consumption of the coal-fired steam injection boiler system in the process of heating the make-up water, thereby reducing the coal-fired steam injection boiler system. The cost of carbon dioxide capture system powered by the system; in addition, the coal-fired steam injection boiler system outputs high-temperature and high-pressure steam to the turbo-generator, which converts the high-temperature and high-pressure steam into electrical energy and low-temperature and low-pressure steam, and the rich liquid pump It is electrically connected to the power generation interface of the turbo-generator with the lean liquid pump, and the electric energy generated by the turbo-generator can be used to power the rich liquid pump and the lean liquid pump, thus saving the extra power consumed by the rich liquid pump and the lean liquid pump in the process of capturing carbon dioxide. , reducing the capture cost; in addition, the generated low-temperature and low-pressure steam is directly introduced into the boiler, and heat-exchanges with the liquid entering through the second inlet of the boiler in the boiler, so that the low-temperature steam generated by the turbine generator The low-pressure steam is effectively recycled, and at the same time, it avoids the energy consumption of additional steam provided to the boiler, and saves the cost of capturing; in addition, the low-temperature and low-pressure steam turns into condensed water after exothermic cooling in the boiler. It is directly injected into the coal-fired steam injection boiler system as make-up water, which effectively recovers and utilizes waste water. At the same time, the make-up water needs to be heated and converted into steam in the coal-fired steam injection boiler system. In other words, with a higher temperature, the coal consumption in the process of converting the condensate water with a higher temperature into steam in the coal-fired steam injection boiler system is less than that of ordinary make-up water, so the recovery and utilization of the condensate water is also reduced. The energy consumption of the coal-fired steam injection boiler system saves the cost.

附图说明Description of drawings

图1是根据本实用新型的基于燃煤注汽锅炉系统供电的二氧化碳捕集系统的示意图。1 is a schematic diagram of a carbon dioxide capture system powered by a coal-fired steam injection boiler system according to the present invention.

其中,附图标记说明如下:Among them, the reference numerals are described as follows:

11吸收塔 173注汽锅炉本体11 Absorption tower 173 Steam injection boiler body

11A1吸收塔第一入口 173A注汽锅炉本体入口11A1 The first inlet of the absorption tower 173A The inlet of the steam injection boiler

11A2吸收塔第二入口 173B1注汽锅炉本体第一出口11A2 The second inlet of the absorption tower 173B1 The first outlet of the steam injection boiler body

11B1吸收塔第一出口11B1 absorption tower first outlet

11B2吸收塔第二出口 173B2注汽锅炉本体第二出口11B2 The second outlet of the absorption tower 173B2 The second outlet of the steam injection boiler body

12富液泵12 Rich liquid pump

13贫富液换热器 18汽轮发电机13 Lean rich liquid heat exchanger 18 Turbogenerator

13A1贫富液换热器第一入口 18A汽轮发电机蒸汽入口13A1 lean-rich liquid heat exchanger first inlet 18A steam turbine generator steam inlet

13A2贫富液换热器第二入口 18B汽轮发电机蒸汽出口13A2 The second inlet of the lean-rich liquid heat exchanger 18B The steam outlet of the steam turbine generator

13B1贫富液换热器第一出口 18C汽轮发电机发电接口13B1 The first outlet of the lean and rich liquid heat exchanger 18C steam turbine generator power generation interface

13B2贫富液换热器第二出口 19煮沸器13B2 Lean and rich liquid heat exchanger second outlet 19 Boiler

14解吸塔 19A1煮沸器第一入口14 Desorption tower 19A1 boiler first inlet

14A1解吸塔第一入口 19A2煮沸器第二入口14A1 The first inlet of the desorption tower 19A2 The second inlet of the boiler

14A2解吸塔第二入口 19B1煮沸器第一出口14A2 The second inlet of the desorption tower 19B1 The first outlet of the boiler

14B1解吸塔第一出口 19B2煮沸器第二出口14B1 The first outlet of the desorption tower 19B2 The second outlet of the boiler

14B2解吸塔第二出口 20再生气冷却器14B2 second outlet of desorption tower 20 regeneration gas cooler

14B3解吸塔第三出口 20A1再生气冷却器第一入口14B3 The third outlet of the desorption tower 20A1 The first inlet of the regeneration gas cooler

15贫液泵 20A2再生气冷却器第二入口15 lean liquid pump 20A2 regeneration gas cooler second inlet

16贫液冷却器 20B1再生气冷却器第一出口16 Lean liquid cooler 20B1 First outlet of regeneration gas cooler

16A1贫液冷却器第一入口 20B2再生气冷却器第二出口16A1 First inlet of lean liquid cooler 20B2 Second outlet of regeneration gas cooler

16A2贫液冷却器第二入口 21压缩机16A2 lean liquid cooler second inlet 21 compressor

16B1贫液冷却器第一出口 21A压缩机入口16B1 lean liquid cooler first outlet 21A compressor inlet

16B2贫液冷却器第二出口 21B压缩机出口16B2 Second outlet of lean liquid cooler 21B compressor outlet

17燃煤注汽锅炉系统 22压缩气冷却器17 Coal-fired steam injection boiler system 22 Compressed gas cooler

171锅炉除氧器 22A1压缩气冷却器第一入口171 boiler deaerator 22A1 compressed air cooler first inlet

171A1锅炉除氧器第一入口 22A2压缩气冷却器第二入口171A1 Boiler deaerator first inlet 22A2 Compressed gas cooler second inlet

171A2锅炉除氧器第二入口 22B1压缩气冷却器第一出口171A2 Boiler deaerator second inlet 22B1 Compressed gas cooler first outlet

171B锅炉除氧器出口 22B2压缩气冷却器第二出口171B boiler deaerator outlet 22B2 second outlet of compressed air cooler

172锅炉汽包 23引风机172 boiler drum 23 induced draft fan

172A1锅炉汽包第一入口 23A引风机入口172A1 Boiler drum first inlet 23A induced draft fan inlet

172A2锅炉汽包第二入口 23B引风机出口172A2 The second inlet of the boiler drum 23B The outlet of the induced draft fan

172B锅炉汽包出口172B Boiler drum outlet

具体实施方式Detailed ways

参照图1,本实用新型的基于燃煤注汽锅炉系统供电的二氧化碳捕集系统包括吸收塔11、富液泵12、贫富液换热器13、解吸塔14、贫液泵15、贫液冷却器16、燃煤注汽锅炉系统17、汽轮发电机18、煮沸器19。本实用新型的基于燃煤注汽锅炉系统供电的二氧化碳捕集系统还包括再生气冷却器20、压缩机21、压缩气冷却器22和引风机23。Referring to FIG. 1 , the carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system of the present invention includes an absorption tower 11, a rich liquid pump 12, a lean and rich liquid heat exchanger 13, a desorption tower 14, a lean liquid pump 15, and a lean liquid Cooler 16 , coal-fired steam injection boiler system 17 , turbine generator 18 , boiler 19 . The carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system of the present invention further includes a regeneration gas cooler 20 , a compressor 21 , a compressed gas cooler 22 and an induced draft fan 23 .

吸收塔11包括:吸收塔第一入口11A1,位于吸收塔11的下部,供烟气进入;吸收塔第二入口11A2,位于吸收塔11的上部;吸收塔第一出口11B1,位于吸收塔11的底部;吸收塔第二出口11B2,位于吸收塔11的顶部。The absorption tower 11 includes: the first inlet 11A1 of the absorption tower, which is located at the lower part of the absorption tower 11, for entering the flue gas; the second inlet 11A2 of the absorption tower, which is located at the upper part of the absorption tower 11; Bottom; the second outlet 11B2 of the absorption tower is located at the top of the absorption tower 11 .

贫富液换热器13包括:贫富液换热器第一入口13A1;贫富液换热器第二入口13A2;贫富液换热器第一出口13B1;贫富液换热器第二出口13B2。The lean-rich liquid heat exchanger 13 includes: a first inlet 13A1 of the lean-rich liquid heat exchanger; a second inlet 13A2 of the lean-rich liquid heat exchanger; a first outlet 13B1 of the lean-rich liquid heat exchanger; Exit 13B2.

富液泵12的一侧连通于吸收塔第一出口11B1,另一侧连通于贫富液换热器第一入口13A1。One side of the rich liquid pump 12 is connected to the first outlet 11B1 of the absorption tower, and the other side is connected to the first inlet 13A1 of the lean-rich liquid heat exchanger.

解吸塔14包括:解吸塔第一入口14A1,位于解吸塔14的上部,连通贫富液换热器第一出口13B1;解吸塔第二入口14A2,位于解吸塔14的底部;解吸塔第一出口14B1,位于解吸塔14的底部;解吸塔第二出口14B2,位于解吸塔14的顶部;解吸塔第三出口14B3,位于解吸塔14的下部。The desorption tower 14 includes: a first inlet 14A1 of the desorption tower, located at the upper part of the desorption tower 14, connected to the first outlet 13B1 of the lean-rich liquid heat exchanger; a second inlet 14A2 of the desorption tower, located at the bottom of the desorption tower 14; the first outlet of the desorption tower 14B1 is located at the bottom of the desorption tower 14; the second outlet of the desorption tower 14B2 is located at the top of the desorption tower 14;

贫液泵15的一侧连通于解吸塔第一出口14B1,另一侧连通于贫富液换热器第二入口13A2。One side of the lean liquid pump 15 is connected to the first outlet 14B1 of the desorption tower, and the other side is connected to the second inlet 13A2 of the lean-rich liquid heat exchanger.

贫液冷却器16包括:贫液冷却器第一入口16A1,连通贫富液换热器第二出口13B2;贫液冷却器第二入口16A2,供外部除盐水进入;贫液冷却器第一出口16B1,连通于燃煤注汽锅炉系统17;贫液冷却器第二出口16B2,连通于吸收塔第二入口11A2。The lean liquid cooler 16 includes: the first inlet 16A1 of the lean liquid cooler, which is connected to the second outlet 13B2 of the lean and rich liquid heat exchanger; the second inlet 16A2 of the lean liquid cooler, for the entry of external demineralized water; the first outlet of the lean liquid cooler 16B1 is connected to the coal-fired steam injection boiler system 17; the second outlet 16B2 of the lean liquid cooler is connected to the second inlet 11A2 of the absorption tower.

汽轮发电机18包括:汽轮发电机蒸汽入口18A,连通于燃煤注汽锅炉系统17;汽轮发电机蒸汽出口18B;汽轮发电机发电接口18C,分别电连接于富液泵12、贫液泵15(图1中的虚线代表电连接关系)。The turbogenerator 18 includes: a turbogenerator steam inlet 18A, which is connected to the coal-fired steam injection boiler system 17; a turbogenerator steam outlet 18B; Lean liquid pump 15 (the dotted line in FIG. 1 represents the electrical connection).

煮沸器19包括:煮沸器第一入口19A1,连通于汽轮发电机蒸汽出口18B;煮沸器第二入口19A2,连通于解吸塔第三出口14B3;煮沸器第一出口19B1,连通于燃煤注汽锅炉系统17;煮沸器第二出口19B2,连通于解吸塔第二入口14A2。The boiler 19 includes: the first inlet 19A1 of the boiler, which is connected to the steam outlet 18B of the turbine generator; the second inlet 19A2 of the boiler, which is connected to the third outlet 14B3 of the desorption tower; and the first outlet 19B1 of the boiler, which is connected to the coal injection The steam boiler system 17; the second outlet 19B2 of the boiler is connected to the second inlet 14A2 of the desorption tower.

其中,烟气经由吸收塔第一入口11A1进入吸收塔11中且从下往上运动,吸收剂经由吸收塔第二入口11A2进入吸收塔11中且往下喷淋,往下喷淋的吸收剂与烟气逆流接触,从而吸收剂吸收烟气中的二氧化碳而变为富液,富液向下沉降,脱除了二氧化碳的烟气继续向上运动并经由吸收塔第二出口11B2排出;Among them, the flue gas enters the absorption tower 11 through the first inlet 11A1 of the absorption tower and moves from bottom to top, and the absorbent enters the absorption tower 11 through the second inlet 11A2 of the absorption tower and is sprayed downward, and the absorbent sprayed downward In countercurrent contact with the flue gas, the absorbent absorbs carbon dioxide in the flue gas and becomes rich liquid, the rich liquid settles downward, and the flue gas from which carbon dioxide has been removed continues to move upward and is discharged through the second outlet 11B2 of the absorption tower;

富液经由富液泵12从吸收塔第一出口11B1、贫富液换热器第一入口13A1泵入到贫富液换热器13中进行第一热交换,富液吸热升温;The rich liquid is pumped into the lean-rich liquid heat exchanger 13 from the first outlet 11B1 of the absorption tower and the first inlet 13A1 of the lean-rich liquid heat exchanger via the rich liquid pump 12 to perform the first heat exchange, and the rich liquid absorbs heat and heats up;

完成第一热交换的富液经由贫富液换热器第一出口13B1、解吸塔第一入口14A1进入解吸塔14中,富液在解吸塔14中被加热解吸并分解为贫液和二氧化碳,贫液在解吸塔14中向下沉降,二氧化碳向上运动并经由解吸塔第二出口14B2排出;The rich liquid that has completed the first heat exchange enters the desorption tower 14 through the first outlet 13B1 of the lean-rich liquid heat exchanger and the first inlet 14A1 of the desorption tower, and the rich liquid is heated and desorbed in the desorption tower 14 and decomposed into lean liquid and carbon dioxide, The lean liquid settles downward in the desorption tower 14, and the carbon dioxide moves upward and is discharged through the second outlet 14B2 of the desorption tower;

解吸塔14中解吸出的贫液经由贫液泵15从解吸塔第一出口14B1、贫富液换热器第二入口13A2泵入到贫富液换热器13中,与经由贫富液换热器第一入口13A1进入的富液进行前述的第一热交换,贫液放热降温;The lean liquid desorbed from the desorption tower 14 is pumped into the lean and rich liquid heat exchanger 13 through the lean liquid pump 15 from the first outlet 14B1 of the desorption tower and the second inlet 13A2 of the lean and rich liquid heat exchanger, and is exchanged with the lean and rich liquid. The rich liquid entering the first inlet 13A1 of the heater is subjected to the aforementioned first heat exchange, and the lean liquid releases heat to cool down;

完成第一热交换的贫液经由贫富液换热器第二出口13B2、贫液冷却器第一入口16A1进入贫液冷却器16中,与经由贫液冷却器第二入口16A2进入的除盐水进行第二热交换,贫液再次放热降温,降温后的贫液经由贫液冷却器第二出口16B2、吸收塔第二入口11A2进入吸收塔11中作为前述吸收剂使用;The lean liquid that has completed the first heat exchange enters the lean liquid cooler 16 through the second outlet 13B2 of the lean-rich liquid heat exchanger and the first inlet 16A1 of the lean liquid cooler, and the demineralized water that enters through the second inlet 16A2 of the lean liquid cooler The second heat exchange is carried out, the lean liquid is exothermic and cooled again, and the cooled lean liquid enters the absorption tower 11 through the second outlet 16B2 of the lean liquid cooler and the second inlet 11A2 of the absorption tower to be used as the aforementioned absorbent;

经由贫液冷却器第二入口16A2进入的除盐水吸热升温,吸热升温后的除盐水经由贫液冷却器第一出口16B1进入燃煤注汽锅炉系统17中,以作为燃煤注汽锅炉系统17的补给水使用;The demineralized water entering through the second inlet 16A2 of the lean liquid cooler absorbs heat and heats up, and the demineralized water after the endothermic temperature rises enters the coal-fired steam injection boiler system 17 through the first outlet 16B1 of the lean liquid cooler to serve as the coal-fired steam injection boiler make-up water usage for system 17;

补给水(除盐水)在燃煤注汽锅炉系统17的作用下变为高温高压蒸汽,一部分高温高压蒸汽通入汽轮发电机18中,在汽轮发电机18中高温高压蒸汽转变为电能和低温低压蒸汽,汽轮发电机18的汽轮发电机发电接口18C电连接富液泵12和贫液泵15,以对富液泵12和贫液泵15提供电能;The make-up water (demineralized water) becomes high-temperature and high-pressure steam under the action of the coal-fired steam injection boiler system 17, and a part of the high-temperature and high-pressure steam is passed into the turbo-generator 18, where the high-temperature and high-pressure steam is converted into electrical energy and For low-temperature and low-pressure steam, the turbo-generator power generation interface 18C of the turbo-generator 18 is electrically connected to the rich liquid pump 12 and the lean liquid pump 15 to provide electrical energy to the rich liquid pump 12 and the lean liquid pump 15;

低温低压蒸汽经由汽轮发电机蒸汽出口18B、煮沸器第一入口19A1进入煮沸器19中进行第三热交换;The low temperature and low pressure steam enters the boiler 19 through the steam turbine generator steam outlet 18B and the first inlet 19A1 of the boiler for the third heat exchange;

解吸塔14底的部分液体(可以是解吸彻底的贫液,也可以是解吸不彻底的半贫液)经由解吸塔第三出口14B3、煮沸器第二入口19A2进入煮沸器19中,与经由煮沸器第一入口19A1进入煮沸器19的低温低压蒸汽进行前述第三热交换,所述部分液体在煮沸器19中吸热升温而被部分汽化并由煮沸器第二出口19B2、解吸塔第二入口14A2进入解吸塔14中,以为解吸塔14中的富液解吸提供蒸汽和热量;煮沸器19中的低温低压蒸汽放热降温而变为凝结水,凝结水经由煮沸器第一出口19B1进入到燃煤注汽锅炉系统17中,以作为燃煤注汽锅炉系统17的补给水使用。Part of the liquid at the bottom of the desorption tower 14 (it may be a lean liquid with complete desorption, or a semi-lean liquid with incomplete desorption) enters the boiler 19 through the third outlet 14B3 of the desorption tower and the second inlet 19A2 of the boiler, and is connected to the boiler 19 through the boiling The low-temperature and low-pressure steam entering the boiler 19 from the first inlet 19A1 of the boiler is subjected to the aforementioned third heat exchange, and the part of the liquid is partially vaporized by endothermic heating in the boiler 19 and is partially vaporized through the boiler second outlet 19B2 and the second inlet of the desorption tower. 14A2 enters the desorption tower 14 to provide steam and heat for the desorption of the rich liquid in the desorption tower 14; the low-temperature and low-pressure steam in the boiler 19 exotherms and cools down to become condensed water, and the condensed water enters the combustion chamber through the first outlet 19B1 of the boiler. In the coal-fired steam injection boiler system 17 , it is used as make-up water for the coal-fired steam injection boiler system 17 .

需要说明的是,二氧化碳的吸收需要在较低的温度下进行,从而保证吸收塔11中的二氧化碳的吸收量达到最大化,而二氧化碳的解吸需要在较高的温度下进行,从而使得解吸塔14中的二氧化碳充分解吸出来。It should be noted that the absorption of carbon dioxide needs to be carried out at a lower temperature, so as to ensure that the absorption of carbon dioxide in the absorption tower 11 is maximized, and the desorption of carbon dioxide needs to be carried out at a higher temperature, so that the desorption tower 14 The carbon dioxide in it is fully desorbed.

在根据本实用新型的基于燃煤注汽锅炉系统供电的二氧化碳捕集系统中,经由吸收塔第一出口11B1排出的富液(为冷富液)流入到贫富液换热器13中,与经由解吸塔第一出口14B1流出的贫液(热贫液)进行第一热交换,富液吸热升温然后流入到解吸塔14中进行解吸,有效地利用了热贫液的废热;完成第一热交换的贫液仍具有较高的热量,完成第一热交换的贫液在贫液冷却器13中与经由贫液冷却器第二入口13A2流入的除盐水进行第二热交换,贫液被继续冷却,除盐水吸热升温,吸热升温的除盐水流入到燃煤注汽锅炉系统17中作为补给水使用,这一换热过程有效地回收了贫液的废热,且吸热升温的除盐水减少了燃煤注汽锅炉系统17在加热补给水过程的耗煤量,进而降低了基于燃煤注汽锅炉系统供电的二氧化碳捕集系统捕集二氧化碳的成本;此外,燃煤注汽锅炉系统17向汽轮发电机18输出高温高压蒸汽,汽轮发电机18将高温高压蒸汽转变为电能和低温低压蒸汽,富液泵12和贫液泵15电连接汽轮发电机发电接口18C,汽轮发电机18产生的电能可用于富液泵12和贫液泵15的供电,从而节省了捕集二氧化碳过程中富液泵12和贫液泵15额外消耗的电能,降低了捕集成本;再者,产生的低温低压蒸汽直接通入到煮沸器19中,并在煮沸器19中与经由煮沸器第二入口19A2进入的液体进行热交换,需要说明的是,低温低压蒸汽仍然具有很高的温度,而低温低压蒸汽直接流入煮沸器19中作为蒸汽使用,使得汽轮发电机18产生的低温低压蒸汽得到了有效的回收利用,同时避免了额外向煮沸器19提供蒸汽所消耗的能耗,节约了捕集成本;此外,低温低压蒸汽在煮沸器19中放热降温后变为凝结水,凝结水直接注入到燃煤注汽锅炉系统17中作为补给水使用,有效地回收、利用了废水(凝结水),同时补给水在燃煤注汽锅炉系统17需要加热转变为蒸汽,而凝结水相对于普通的锅炉补给水而言,具有较高的温度,具有较高温度的凝结水在燃煤注汽锅炉系统17中转变为蒸汽的过程煤耗相比于普通的补给水更少,由此,凝结水的回收利用还降低了燃煤注汽锅炉系统17的能耗,节约了成本。In the carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system according to the present invention, the rich liquid (cold rich liquid) discharged through the first outlet 11B1 of the absorption tower flows into the lean and rich liquid heat exchanger 13, and is mixed with the rich liquid heat exchanger 13. The lean liquid (hot lean liquid) flowing out through the first outlet 14B1 of the desorption tower carries out the first heat exchange, and the rich liquid absorbs heat and heats up and then flows into the desorption tower 14 for desorption, effectively utilizing the waste heat of the hot lean liquid; complete the first The lean liquid of the heat exchange still has higher heat, and the lean liquid that has completed the first heat exchange is subjected to a second heat exchange in the lean liquid cooler 13 with the demineralized water flowing in through the second inlet 13A2 of the lean liquid cooler, and the lean liquid is Continue to cool, the demineralized water absorbs heat to heat up, and the demineralized water that absorbs heat and heats up flows into the coal-fired steam injection boiler system 17 for use as make-up water. The brine reduces the coal consumption of the coal-fired steam injection boiler system 17 in the process of heating the make-up water, thereby reducing the cost of carbon dioxide capture by the carbon dioxide capture system based on the power supply of the coal-fired steam injection boiler system; in addition, the coal-fired steam injection boiler system 17 outputs high temperature and high pressure steam to the steam turbine generator 18, and the steam turbine generator 18 converts the high temperature and high pressure steam into electric energy and low temperature and low pressure steam. The rich liquid pump 12 and the lean liquid pump 15 are electrically connected to the turbine generator power generation interface 18C. The electric energy generated by the generator 18 can be used for power supply of the rich liquid pump 12 and the lean liquid pump 15, thereby saving the extra electric energy consumed by the rich liquid pump 12 and the lean liquid pump 15 in the process of capturing carbon dioxide, and reducing the capture cost; The generated low-temperature and low-pressure steam is directly introduced into the boiler 19, and heat-exchanges with the liquid entering through the second inlet 19A2 of the boiler in the boiler 19. It should be noted that the low-temperature and low-pressure steam still has a very high temperature, The low-temperature and low-pressure steam directly flows into the boiler 19 for use as steam, so that the low-temperature and low-pressure steam generated by the turbo-generator 18 can be effectively recycled, and at the same time, the energy consumption of additional steam provided to the boiler 19 is avoided, and the energy consumption is saved. In addition, the low-temperature and low-pressure steam becomes condensed water after releasing heat and cooling in the boiler 19, and the condensed water is directly injected into the coal-fired steam injection boiler system 17 as make-up water, which effectively recovers and utilizes waste water (condensation). At the same time, the make-up water needs to be heated and converted into steam in the coal-fired steam injection boiler system 17, and the condensate water has a higher temperature than the ordinary boiler make-up water, and the condensate water with a higher temperature is used in the coal-fired steam injection. The process of converting into steam in the steam boiler system 17 consumes less coal than ordinary make-up water, so the recycling of condensate water also reduces the energy consumption of the coal-fired steam injection boiler system 17 and saves costs.

燃煤注汽锅炉系统17包括锅炉除氧器171、锅炉汽包172和注汽锅炉本体173。The coal-fired steam injection boiler system 17 includes a boiler deaerator 171 , a boiler steam drum 172 and a steam injection boiler body 173 .

锅炉除氧器171包括:锅炉除氧器第一入口171A1,连通贫液冷却器第一出口16B1;锅炉除氧器出口171B。The boiler deaerator 171 includes: a first inlet 171A1 of the boiler deaerator, which is connected to the first outlet 16B1 of the lean liquid cooler; and an outlet 171B of the boiler deaerator.

锅炉汽包172包括:锅炉汽包第一入口172A1,连通锅炉除氧器出口171B;锅炉汽包出口172B。The boiler steam drum 172 includes: a first inlet 172A1 of the boiler steam drum, which is connected to the boiler deaerator outlet 171B; and the boiler steam drum outlet 172B.

注汽锅炉本体173包括:注汽锅炉本体入口173A,连通锅炉汽包出口172B;注汽锅炉本体第一出口173B1,连通汽轮发电机蒸汽入口18A;注汽锅炉本体第二出口173B2。The steam injection boiler body 173 includes: the steam injection boiler body inlet 173A, which communicates with the boiler steam drum outlet 172B; the steam injection boiler body first outlet 173B1, which communicates with the turbine generator steam inlet 18A; and the steam injection boiler body second outlet 173B2.

其中,经由贫液冷却器第二入口16A2进入的除盐水进行前述第二热交换后吸热升温,吸热升温的除盐水经由贫液冷却器第一出口16B1、锅炉除氧器第一入口171A1进入锅炉除氧器171中进行除氧处理,脱氧的除盐水经由锅炉除氧器出口171B、锅炉汽包第一入口172A1进入锅炉汽包172中被汽化而变为蒸汽;蒸汽经由锅炉汽包出口172B、注汽锅炉本体入口173A进入注汽锅炉本体173中,蒸汽在注汽锅炉本体173中被加热而成为高温高压蒸汽,前述的一部分高温高压蒸汽经由注汽锅炉本体第一出口173B1、汽轮发电机蒸汽入口18A进入汽轮发电机18中,以向汽轮发电机18提供蒸汽;另一部分高温高压蒸汽经由注汽锅炉本体第二出口173B2流向外界。除盐水进行脱氧处理可以防止锅炉的氧腐蚀,提高注汽锅炉本体173的使用寿命。需要说明的是,高温高压蒸汽流入外界指的是流入油气田中使用。Among them, the demineralized water entering through the second inlet 16A2 of the lean liquid cooler undergoes the aforementioned second heat exchange and then endothermic temperature rises, and the demineralized water that has endothermic temperature rise passes through the first outlet 16B1 of the lean liquid cooler and the first inlet 171A1 of the boiler deaerator Entering the boiler deaerator 171 for deoxidation treatment, the deoxygenated demineralized water enters the boiler steam drum 172 through the boiler deaerator outlet 171B and the first inlet 172A1 of the boiler steam drum and is vaporized into steam; the steam passes through the boiler steam drum outlet 172B, the inlet 173A of the steam injection boiler body enters the steam injection boiler body 173, the steam is heated in the steam injection boiler body 173 to become high temperature and high pressure steam, and a part of the aforementioned high temperature and high pressure steam passes through the first outlet 173B1 of the steam injection boiler body, the steam turbine. The generator steam inlet 18A enters the turbo generator 18 to provide steam to the turbo generator 18; another part of the high temperature and high pressure steam flows to the outside through the second outlet 173B2 of the steam injection boiler body. Deoxidizing the demineralized water can prevent oxygen corrosion of the boiler and improve the service life of the steam injection boiler body 173 . It should be noted that the flow of high-temperature and high-pressure steam into the outside world refers to the flow into oil and gas fields for use.

如前所述,经由贫液冷却器第二入口16A2进入的除盐水(冷却水)对经由贫液冷却器第一入口16A1进入的贫液进行冷却,除盐水吸热升温,吸热升温的除盐水流入到燃煤注汽锅炉系统17中作为补给水使用,这一过程既有效地回收了贫液的废热,减少了燃煤注汽锅炉系统17将补给水加热而转变为蒸汽过程的煤耗,还避免了作为冷却剂使用的除盐水的浪费,降低了捕集成本。As mentioned above, the demineralized water (cooling water) entering through the second inlet 16A2 of the depleted liquid cooler cools the depleted liquid entering through the first inlet 16A1 of the depleted liquid cooler, the demineralized water absorbs heat and heats up, and the demineralized water that absorbs heat increases. The brine flows into the coal-fired steam injection boiler system 17 for use as make-up water. This process not only effectively recovers the waste heat of the lean liquid, but also reduces the coal consumption of the coal-fired steam-injection boiler system 17 to heat the make-up water and convert it into steam. Waste of desalinated water used as a coolant is also avoided, reducing capture costs.

锅炉除氧器171还包括:锅炉除氧器第二入口171A2。The boiler deaerator 171 further includes: a second inlet 171A2 of the boiler deaerator.

基于燃煤注汽锅炉系统供电的二氧化碳捕集系统还包括再生气冷却器20、压缩机21、压缩气冷却器22。The carbon dioxide capture system powered by the coal-fired steam injection boiler system further includes a regeneration gas cooler 20 , a compressor 21 , and a compressed gas cooler 22 .

再生气冷却器20包括:再生气冷却器第一入口20A1,连通解吸塔第二出口14B2;再生气冷却器第二入口20A2,供外部除盐水进入;再生气冷却器第一出口20B1,连通锅炉除氧器第二入口171A2;再生气冷却器第二出口20B2。The regeneration gas cooler 20 includes: a first inlet 20A1 of the regeneration gas cooler, which is connected to the second outlet 14B2 of the desorption tower; a second inlet 20A2 of the regeneration gas cooler, which is used for external demineralized water to enter; and a first outlet 20B1 of the regeneration gas cooler, which is connected to the boiler Deaerator second inlet 171A2; regeneration gas cooler second outlet 20B2.

压缩机21包括:压缩机入口21A,连通再生气冷却器第二出口20B2;压缩机出口21B。The compressor 21 includes: a compressor inlet 21A, which communicates with the second outlet 20B2 of the regeneration gas cooler; and a compressor outlet 21B.

压缩气冷却器22包括:压缩气冷却器第一入口22A1,连通压缩机出口21B;压缩气冷却器第二入口22A2,供外部除盐水进入;压缩气冷却器第一出口22B1;压缩气冷却器第二出口22B2,连通锅炉除氧器第二入口171A2。The compressed air cooler 22 includes: a first inlet 22A1 of the compressed air cooler, which communicates with the compressor outlet 21B; a second inlet 22A2 of the compressed air cooler, for the entry of external demineralized water; a first outlet of the compressed air cooler 22B1; The second outlet 22B2 communicates with the second inlet 171A2 of the boiler deaerator.

其中,经由解吸塔第二出口14B2排出的二氧化碳经由再生气冷却器第一入口20A1进入再生气冷却器20中,与经由再生气冷却器第二入口20A2进入的除盐水进行第四热交换,Wherein, the carbon dioxide discharged through the second outlet 14B2 of the desorption tower enters the regeneration gas cooler 20 through the first inlet 20A1 of the regeneration gas cooler, and performs the fourth heat exchange with the demineralized water entering through the second inlet 20A2 of the regeneration gas cooler,

二氧化碳放热降温然后经由再生气冷却器第二出口20B2、压缩机入口21A进入压缩机21中,二氧化碳被压缩机21压缩增压,增压后的二氧化碳升温升压然后经由压缩机出口21B、压缩气冷却器第一入口22A1进入压缩气冷却器22中进行第五热交换,二氧化碳再次放热降温,然后经由压缩气冷却器第一出口22B1排出;The carbon dioxide releases heat to cool down and then enters the compressor 21 through the second outlet 20B2 of the regenerating gas cooler and the compressor inlet 21A. The carbon dioxide is compressed and pressurized by the compressor 21. The first inlet 22A1 of the air cooler enters the compressed air cooler 22 for fifth heat exchange, and the carbon dioxide releases heat again to cool down, and then is discharged through the first outlet 22B1 of the compressed air cooler;

经由再生气冷却器第二入口20A2进入的除盐水与经由再生气冷却器第一入口20A1进入的二氧化碳进行前述第四热交换,除盐水吸热升温然后经由再生气冷却器第一出口20B1、锅炉除氧器第二入口171A2进入锅炉除氧器171中进行除氧,脱氧后的除盐水经由锅炉除氧器出口171B、锅炉汽包172入口进入锅炉汽包172中,以作为补给水使用;The demineralized water entering via the second inlet 20A2 of the regenerating gas cooler and the carbon dioxide entering via the first inlet 20A1 of the regenerating gas cooler perform the aforementioned fourth heat exchange, the demineralized water absorbs heat and raises the temperature and then passes through the first outlet 20B1 of the regenerating gas cooler, the boiler The second inlet 171A2 of the deaerator enters the boiler deaerator 171 for deoxidation, and the deoxidized demineralized water enters the boiler steam drum 172 through the boiler deaerator outlet 171B and the inlet of the boiler steam drum 172 to be used as make-up water;

经由压缩气冷却器第二入口22A2进入的除盐水与经由压缩气冷却器第一入口22A1进入的二氧化碳进行前述第五热交换,除盐水吸热升温然后经由压缩气冷却器第二出口22B2、锅炉除氧器第二入口171A2进入锅炉除氧器171中进行除氧,脱氧后的除盐水经由锅炉除氧器出口171B、锅炉汽包172入口进入锅炉汽包172中,以作为补给水使用。The demineralized water entering through the second inlet 22A2 of the compressed gas cooler and the carbon dioxide entering through the first inlet 22A1 of the compressed gas cooler perform the aforementioned fifth heat exchange, the demineralized water absorbs heat and raises the temperature and then passes through the second outlet 22B2 of the compressed gas cooler, the boiler The second inlet 171A2 of the deaerator enters the boiler deaerator 171 for deoxidation, and the deoxygenated demineralized water enters the boiler drum 172 through the outlet 171B of the boiler deaerator and the inlet of the boiler drum 172 to be used as make-up water.

在基于燃煤注汽锅炉系统供电的二氧化碳捕集系统中,从解吸塔第二出口14B2排出的二氧化碳具有很高的热量,高热量的二氧化碳被经由再生气冷却器第二入口20A2进入的除盐水降温,然后吸热升温的除盐水进入锅炉系统中作为补给水使用,吸热升温的除盐水相对于燃煤注汽锅炉系统17普通的补给水而言,具有较高的热量,因此其在燃煤注汽锅炉系统17中转化为蒸汽的过程所需的燃煤用量大大降低,由此降低了燃煤注汽锅炉系统17加热补给水所需的煤耗,同时有效回收了二氧化碳所携带的废热,降低了能量的损耗;在压缩机21中增压后的二氧化碳具有高温高压,高温高压的二氧化碳在压缩气冷却器22中再次进行降温,经由压缩气冷却器第二入口22A2进入的除盐水吸热升温,然后吸热升温的除盐水进入燃煤注汽锅炉系统17中作为补给水使用,同上所述,吸热升温的除盐水相对于燃煤注汽锅炉系统17普通的补给水而言,具有较高的热量,因此其在燃煤注汽锅炉系统17中转化为蒸汽的过程所需的燃煤用量大大降低,有效回收了废热。完成第四热交换和第五热交换的二氧化碳流入到外界的二氧化碳输送管道中,以进行进一步的处理。In the carbon dioxide capture system powered by coal-fired steam injection boiler system, the carbon dioxide discharged from the second outlet 14B2 of the desorption tower has a high heat, and the high heat carbon dioxide is demineralized by the demineralized water entering through the second inlet 20A2 of the regeneration gas cooler Cooling, and then the demineralized water that absorbs heat and heats up enters the boiler system to be used as make-up water. The demineralized water that absorbs heat and heats up has higher heat than the ordinary make-up water of the coal-fired steam-injection boiler system 17, so it is used during combustion. The coal consumption required for the process of converting into steam in the coal-fired steam injection boiler system 17 is greatly reduced, thereby reducing the coal consumption required for heating the make-up water in the coal-fired steam injection boiler system 17, and at the same time effectively recovering the waste heat carried by carbon dioxide, The loss of energy is reduced; the carbon dioxide pressurized in the compressor 21 has high temperature and high pressure, the high temperature and high pressure carbon dioxide is cooled again in the compressed gas cooler 22, and the demineralized water entering through the second inlet 22A2 of the compressed gas cooler absorbs heat The temperature rises, and then the demineralized water that absorbs heat and heats up enters the coal-fired steam injection boiler system 17 and is used as make-up water. Therefore, the amount of coal required for the process of converting it into steam in the coal-fired steam injection boiler system 17 is greatly reduced, and the waste heat is effectively recovered. The carbon dioxide that has completed the fourth heat exchange and the fifth heat exchange flows into an external carbon dioxide transmission pipeline for further processing.

在一实施例中,汽轮发电机18的汽轮发电机发电接口18C还电连接于压缩机21,以向压缩机21供电。汽轮发电机18向压缩机21供电,避免了压缩机21需要额外的电能来运转,有效地利用了汽轮发电机18所产生的电能,降低了捕集成本。In one embodiment, the turbo-generator power generation interface 18C of the turbo-generator 18 is also electrically connected to the compressor 21 to supply power to the compressor 21 . The turbo-generator 18 supplies power to the compressor 21, which prevents the compressor 21 from needing extra electrical energy to operate, effectively utilizes the electrical energy generated by the turbo-generator 18, and reduces the capture cost.

在一实施例中,锅炉汽包172还包括锅炉汽包第二入口172A2,锅炉汽包第二入口172A2与煮沸器第一出口19B1连通;其中,经由煮沸器第一出口19B1排出的凝结水通过锅炉汽包第二入口172A2进入锅炉汽包172中,以作为锅炉汽包172的补给水使用。凝结水初始来源于燃煤锅炉173释放的高温高压蒸汽,因此,凝结水无需脱氧处理便可直接通入到锅炉汽包172中再次作为补给水使用,且凝结水带有热量,直接通入到锅炉汽包172中,能够降低凝结水转变为蒸汽所需的煤耗,同时凝结水得到了有效地回收利用,降低了损耗。In one embodiment, the boiler drum 172 further includes a second inlet 172A2 of the boiler drum, and the second inlet 172A2 of the boiler drum communicates with the first outlet 19B1 of the boiler; wherein, the condensed water discharged through the first outlet 19B1 of the boiler passes through The second inlet 172A2 of the boiler steam drum enters the boiler steam drum 172 to be used as the make-up water of the boiler steam drum 172 . The condensed water initially comes from the high-temperature and high-pressure steam released by the coal-fired boiler 173. Therefore, the condensed water can be directly passed into the boiler drum 172 without deoxidation treatment and used as make-up water again. In the boiler drum 172, the coal consumption required for converting the condensed water into steam can be reduced, and at the same time, the condensed water is effectively recovered and utilized, and the loss is reduced.

燃煤锅炉的二氧化碳捕集系统还包括引风机23,引风机23包括:引风机入口23A,供外部烟气进入;引风机出口23B,连通吸收塔第一入口11A1;其中,外部的烟气经由引风机入口23A进入到引风机23中,然后经由引风机出口23B、吸收塔第一入口11A1进入到吸收塔11中。The carbon dioxide capture system of the coal-fired boiler also includes an induced draft fan 23, and the induced draft fan 23 includes: an induced draft fan inlet 23A for external flue gas to enter; an induced draft fan outlet 23B, which is connected to the first inlet 11A1 of the absorption tower; wherein the external flue gas passes through The induced draft fan inlet 23A enters the induced draft fan 23, and then enters the absorption tower 11 through the induced draft fan outlet 23B and the first inlet 11A1 of the absorption tower.

汽轮发电机18的汽轮发电机发电接口18C还电连接于引风机23,以向引风机23供电。汽轮发电机18向引风机23供电,避免了引风机23需要额外的电能来运转,有效地利用了汽轮发电机18所产生的电能,降低了捕集成本。The turbo-generator power generation interface 18C of the turbo-generator 18 is also electrically connected to the induced draft fan 23 to supply power to the induced draft fan 23 . The turbo-generator 18 supplies power to the induced draft fan 23, which avoids the induced draft fan 23 needing extra electrical energy to operate, effectively utilizes the electrical energy generated by the turbo-generator 18, and reduces the capture cost.

在一实施例中,引风机入口23A连通于燃煤注汽锅炉系统17,以使燃煤注汽锅炉系统17产生的烟气经由引风机23进入吸收塔11以进行二氧化碳的捕集。这一设计有效地将燃煤注汽锅炉系统产生的烟气进行了处理,减少了二氧化碳的排放。In one embodiment, the induced draft fan inlet 23A is connected to the coal-fired steam injection boiler system 17, so that the flue gas generated by the coal-fired steam injection boiler system 17 enters the absorption tower 11 through the induced draft fan 23 for carbon dioxide capture. This design effectively treats the flue gas produced by the coal-fired steam injection boiler system, reducing carbon dioxide emissions.

Claims (8)

1. A carbon dioxide capture system based on power supply of a coal-fired steam injection boiler system is characterized by comprising an absorption tower (11), a rich liquor pump (12), a lean and rich liquor heat exchanger (13), a desorption tower (14), a lean liquor pump (15), a lean liquor cooler (16), a coal-fired steam injection boiler system (17), a turbine generator (18) and a boiler (19);
the absorption tower (11) comprises:
a first inlet (11A1) of the absorption tower, which is positioned at the lower part of the absorption tower (11) and is used for flue gas to enter;
a second inlet (11A2) of the absorption column, which is located at the upper part of the absorption column (11);
a first outlet (11B1) of the absorption column, which is positioned at the bottom of the absorption column (11);
a second outlet (11B2) of the absorption column, which is positioned at the top of the absorption column (11);
the lean-rich liquid heat exchanger (13) includes:
a lean-rich liquor heat exchanger first inlet (13a 1);
a lean-rich liquor heat exchanger second inlet (13a 2);
a lean-rich liquor heat exchanger first outlet (13B 1);
a lean-rich liquor heat exchanger second outlet (13B 2);
one side of the rich liquid pump (12) is communicated with a first outlet (11B1) of the absorption tower, and the other side is communicated with a first inlet (13A1) of the lean-rich liquid heat exchanger;
the desorption tower (14) comprises:
a first inlet (14A1) of the desorption tower, which is positioned at the upper part of the desorption tower (14) and is communicated with a first outlet (13B1) of the lean-rich liquid heat exchanger;
a desorber second inlet (14a2) located at the bottom of the desorber (14);
a desorber first outlet (14B1) located at the bottom of the desorber (14);
a desorber second outlet (14B2) located at a top of the desorber (14);
a third outlet (14B3) of the desorption tower, which is positioned at the lower part of the desorption tower (14);
one side of the lean liquid pump (15) is communicated with a first outlet (14B1) of the desorption tower, and the other side is communicated with a second inlet (13A2) of the lean-rich liquid heat exchanger;
the lean liquid cooler (16) includes:
a lean liquid cooler first inlet (16A1) in communication with a lean-rich liquid heat exchanger second outlet (13B 2);
a lean liquid cooler second inlet (16A2) for entry of external demineralized water;
a lean liquid cooler first outlet (16B1) in communication with the coal fired steam injection boiler system (17);
a lean liquid cooler second outlet (16B2) in communication with the absorber second inlet (11A 2);
a steam turbine generator (18) comprising:
a steam inlet (18A) of the steam turbine generator is communicated with the coal-fired steam injection boiler system (17);
a turbogenerator steam outlet (18B);
a power generation interface (18C) of the turbonator, which is electrically connected with the rich liquid pump (12) and the barren liquid pump (15) respectively;
boiler (19) comprising:
a boiler first inlet (19A1) communicated with a steam outlet (18B) of the turbonator;
a boiler second inlet (19A2) communicated with the desorption tower third outlet (14B 3);
a boiler first outlet (19B1) communicated with the coal-fired steam injection boiler system (17);
a boiler second outlet (19B2) in communication with the desorber second inlet (14A 2);
the flue gas enters the absorption tower (11) through the first inlet (11A1) of the absorption tower and moves from bottom to top, the absorbent enters the absorption tower (11) through the second inlet (11A2) of the absorption tower and sprays downwards, the absorbent spraying downwards contacts with the flue gas in a countercurrent mode, so that the absorbent absorbs carbon dioxide in the flue gas to become rich liquid, the rich liquid settles downwards, and the flue gas without the carbon dioxide continues to move upwards and is discharged through the second outlet (11B2) of the absorption tower;
the rich liquid is pumped into the lean-rich liquid heat exchanger (13) from a first outlet (11B1) of the absorption tower and a first inlet (13A1) of the lean-rich liquid heat exchanger through a rich liquid pump (12) to carry out first heat exchange, and the rich liquid absorbs heat and is heated;
the rich liquid which completes the first heat exchange enters a desorption tower (14) through a lean rich liquid heat exchanger first outlet (13B1) and a desorption tower first inlet (14A1), the rich liquid is heated and desorbed in the desorption tower (14) and is decomposed into lean liquid and carbon dioxide, the lean liquid is settled downwards in the desorption tower (14), and the carbon dioxide moves upwards and is discharged through a desorption tower second outlet (14B 2);
the lean solution desorbed from the desorption tower (14) is pumped into the lean-rich solution heat exchanger (13) from a first desorption tower outlet (14B1) and a second lean-rich solution heat exchanger inlet (13A2) through a lean solution pump (15), and the lean solution and the rich solution entering through the first lean-rich solution heat exchanger inlet (13A1) are subjected to the first heat exchange, so that the lean solution releases heat and is cooled;
the lean liquid which completes the first heat exchange enters a lean liquid cooler (16) through a second outlet (13B2) of the lean-rich liquid heat exchanger and a first inlet (16A1) of the lean liquid cooler, and carries out second heat exchange with desalted water entering through a second inlet (16A2) of the lean liquid cooler, the lean liquid releases heat again and is cooled, and the cooled lean liquid enters an absorption tower (11) through a second outlet (16B2) of the lean liquid cooler and a second inlet (11A2) of the absorption tower to be used as the absorbent;
the desalted water entering through the second inlet (16A2) of the lean liquid cooler absorbs heat and is heated, and the desalted water after absorbing heat and heating enters the coal-fired steam injection boiler system (17) through the first outlet (16B1) of the lean liquid cooler to be used as make-up water of the coal-fired steam injection boiler system (17);
make-up water is changed into high-temperature high-pressure steam under the action of the coal-fired steam injection boiler system (17), a part of high-temperature high-pressure steam is introduced into the turbonator (18), the high-temperature high-pressure steam is converted into electric energy and low-temperature low-pressure steam in the turbonator (18), and a turbonator power generation interface (18C) of the turbonator (18) is electrically connected with the pregnant solution pump (12) and the barren solution pump (15) so as to provide electric energy for the pregnant solution pump (12) and the barren solution pump (15);
the low-temperature and low-pressure steam enters the boiler (19) through the steam outlet (18B) of the turbonator and the first inlet (19A1) of the boiler to carry out third heat exchange;
part of the liquid at the bottom of the desorption tower (14) enters the boiler (19) through the desorption tower third outlet (14B3) and the boiler second inlet (19A2) and is subjected to the aforementioned third heat exchange with low-temperature low-pressure steam entering the boiler (19) through the boiler first inlet (19A1), the part of the liquid is heated up in the boiler (19) in an endothermic manner to be partially vaporized and enters the desorption tower (14) through the boiler second outlet (19B2) and the desorption tower second inlet (14A2) to provide steam and heat for desorption of the rich liquid in the desorption tower (14); the low-temperature low-pressure steam in the boiler (19) releases heat and is cooled to be condensed water, and the condensed water enters the coal-fired steam injection boiler system (17) through a first outlet (19B1) of the boiler to be used as make-up water of the coal-fired steam injection boiler system (17).
2. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 1,
the coal-fired steam-injection boiler system (17) comprises a boiler deaerator (171), a boiler steam drum (172) and a steam-injection boiler body (173);
the boiler deaerator (171) includes:
a first inlet (171A1) of the boiler deaerator, which is communicated with a first outlet (16B1) of the lean liquid cooler;
a boiler deaerator outlet (171B);
the boiler drum (172) comprises:
a first inlet (172A1) of the boiler drum, which is communicated with an outlet (171B) of the boiler deaerator;
a boiler drum outlet (172B);
the steam injection boiler body (173) includes:
the steam injection boiler body inlet (173A) is communicated with the boiler drum outlet (172B);
the steam injection boiler body first outlet (173B1) is communicated with the steam inlet (18A) of the steam turbine generator;
a steam injection boiler body second outlet (173B 2);
the desalted water entering through the second inlet (16A2) of the lean liquid cooler absorbs heat and is heated after the second heat exchange, the desalted water subjected to heat absorption and heating enters the boiler deaerator (171) through the first outlet (16B1) of the lean liquid cooler and the first inlet (171A1) of the boiler deaerator to be subjected to deaerating treatment, and the deaerated desalted water enters the boiler steam drum (172) through the outlet (171B) of the boiler deaerator and the first inlet (172A1) of the boiler steam drum to be vaporized into steam; steam enters a steam injection boiler body (173) through a boiler drum outlet (172B) and a steam injection boiler body inlet (173A), the steam is heated in the steam injection boiler body (173) to become high-temperature high-pressure steam, and a part of the high-temperature high-pressure steam enters a steam turbine generator (18) through a steam injection boiler body first outlet (173B1) and a steam turbine generator steam inlet (18A) to provide steam for the steam turbine generator (18); another part of the high temperature and high pressure steam flows to the outside through the second outlet (173B2) of the steam injection boiler body.
3. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 2,
the boiler deaerator (171) further comprises: a boiler deaerator second inlet (171A 2);
the carbon dioxide capture system based on power supply of the coal-fired steam injection boiler system further comprises a regeneration gas cooler (20), a compressor (21) and a compressed gas cooler (22);
the regeneration gas cooler (20) comprises:
a regeneration gas cooler first inlet (20A1) in communication with the desorber second outlet (14B 2);
a second inlet (20A2) of the regeneration gas cooler for the entry of external demineralized water;
a regeneration gas cooler first outlet (20B1) in communication with a boiler deaerator second inlet (171A 2);
a regeneration gas cooler second outlet (20B 2);
the compressor (21) comprises:
a compressor inlet (21A) in communication with the regeneration gas cooler second outlet (20B 2);
a compressor outlet (21B);
the compressed gas cooler (22) includes:
a compressor cooler first inlet (22A1) in communication with the compressor outlet (21B);
a second inlet (22A2) of the compressed gas cooler for the entry of external demineralized water;
a compressed gas cooler first outlet (22B 1);
a second outlet (22B2) of the compressed gas cooler, communicating with a second inlet (171A2) of the boiler deaerator;
wherein carbon dioxide discharged via the desorber second outlet (14B2) enters the regeneration gas cooler (20) via the regeneration gas cooler first inlet (20A1) for a fourth heat exchange with demineralized water entering via the regeneration gas cooler second inlet (20A2),
the carbon dioxide is subjected to heat release temperature reduction and then enters a compressor (21) through a second outlet (20B2) of the regeneration gas cooler and a compressor inlet (21A), the carbon dioxide is compressed and pressurized by the compressor (21), the pressurized carbon dioxide enters a compressed gas cooler (22) through a compressor outlet (21B) and a first inlet (22A1) of the compressed gas cooler for fifth heat exchange, the carbon dioxide is subjected to heat release temperature reduction again and then is discharged through a first outlet (22B1) of the compressed gas cooler;
the desalted water entering through the second inlet (20A2) of the regeneration gas cooler and the carbon dioxide entering through the first inlet (20A1) of the regeneration gas cooler are subjected to the fourth heat exchange, the desalted water absorbs heat and is heated, then enters the boiler deaerator (171) through the first outlet (20B1) of the regeneration gas cooler and the second inlet (171A2) of the boiler deaerator for deaerating, and the deaerated desalted water after deaerating enters the boiler steam drum (172) through the outlet (171B) of the boiler deaerator and the inlet of the boiler steam drum (172) to be used as make-up water;
the desalted water entering through the second inlet (22A2) of the compressed air cooler and the carbon dioxide entering through the first inlet (22A1) of the compressed air cooler are subjected to the fifth heat exchange, the desalted water absorbs heat and is heated, then enters the boiler deaerator (171) through the second outlet (22B2) of the compressed air cooler and the second inlet (171A2) of the boiler deaerator for deaerating, and the deaerated desalted water after deaerating enters the boiler drum (172) through the outlet (171B) of the boiler deaerator and the inlet of the boiler drum (172) to be used as make-up water.
4. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 3,
the turbine generator power generation interface (18C) of the turbine generator (18) is also electrically connected to the compressor (21) to supply power to the compressor (21).
5. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 2,
the boiler drum (172) further comprises a boiler drum second inlet (172A2), the boiler drum second inlet (172A2) being in communication with the boiler first outlet (19B 1);
wherein the condensed water discharged via the boiler first outlet (19B1) enters the boiler drum (172) through the boiler drum second inlet (172A2) for use as make-up water for the boiler drum (172).
6. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 1,
the carbon dioxide capture system of the coal-fired boiler also comprises an induced draft fan (23),
the induced draft fan (23) includes:
an inlet (23A) of the induced draft fan, which is used for external flue gas to enter;
an outlet (23B) of the induced draft fan is communicated with a first inlet (11A1) of the absorption tower;
the outside flue gas enters the induced draft fan (23) through an induced draft fan inlet (23A), and then enters the absorption tower (11) through an induced draft fan outlet (23B) and the first absorption tower inlet (11A 1).
7. The coal-fired steam injection boiler system powered carbon dioxide capture system of claim 6,
and a turbine generator power generation interface (18C) of the turbine generator (18) is also electrically connected with the induced draft fan (23) so as to supply power to the induced draft fan (23).
8. The carbon dioxide capture system based on power supply of the coal-fired steam injection boiler system according to claim 6, wherein an inlet (23A) of the induced draft fan is communicated with the coal-fired steam injection boiler system (17) so that flue gas generated by the coal-fired steam injection boiler system (17) enters the absorption tower (11) through the induced draft fan (23) to capture carbon dioxide.
CN201920978025.7U 2019-06-26 2019-06-26 Carbon dioxide capture system based on power supply of coal-fired steam injection boiler system Active CN210385368U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110124464A (en) * 2019-06-26 2019-08-16 中石化石油工程技术服务有限公司 Carbon dioxide capture system based on Steam-injection Boiler Burning Pulverized Coal system power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110124464A (en) * 2019-06-26 2019-08-16 中石化石油工程技术服务有限公司 Carbon dioxide capture system based on Steam-injection Boiler Burning Pulverized Coal system power supply

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