CN108926964A - A kind of Thermal Power Station's timesharing collecting carbonic anhydride storage system - Google Patents

A kind of Thermal Power Station's timesharing collecting carbonic anhydride storage system Download PDF

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CN108926964A
CN108926964A CN201810929014.XA CN201810929014A CN108926964A CN 108926964 A CN108926964 A CN 108926964A CN 201810929014 A CN201810929014 A CN 201810929014A CN 108926964 A CN108926964 A CN 108926964A
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carbon dioxide
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tower
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CN108926964B (en
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郭丛
徐玉杰
汪翔
陈海生
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Institute of Engineering Thermophysics of CAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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Abstract

本发明公开一种热力发电厂分时二氧化碳捕集存储系统，可以有效的通过合理安排电厂的峰谷时刻用电及抽汽，提高电厂对电网削峰填谷的作用，容纳更多可再生能源上网。该装置主要包括贫液储存罐、富液储存罐、吸收塔、解析塔、再沸器、分离器、二氧化碳压缩机、二氧化碳冷却器等部件。在用电高峰期，所述系统运行于二氧化碳吸收工况，此时在消耗少量厂用电的情况下将烟气中的二氧化碳捕捉并储存于富液(吸收了二氧化碳的吸收液)中；在用电低谷期，所述系统运行于二氧化碳解析工况，此时需要消耗大量汽轮机抽汽将富液中的二氧化碳解析成气态，并消耗大量厂用电将常压下气态二氧化碳压缩成高压状态并储存。

The invention discloses a time-sharing carbon dioxide capture and storage system of a thermal power plant, which can effectively arrange power consumption and steam extraction at peak and valley times of the power plant reasonably, improve the power plant's effect on power grid shaving and filling valleys, and accommodate more renewable energy go online. The device mainly includes lean liquid storage tank, rich liquid storage tank, absorption tower, desorption tower, reboiler, separator, carbon dioxide compressor, carbon dioxide cooler and other components. During the peak period of power consumption, the system operates in the carbon dioxide absorption working condition. At this time, the carbon dioxide in the flue gas is captured and stored in the rich liquid (absorbing liquid that has absorbed carbon dioxide) while consuming a small amount of utility power; During the period of low power consumption, the system operates in the carbon dioxide analysis working condition. At this time, it needs to consume a large number of steam turbines to extract steam to decompose the carbon dioxide in the rich liquid into a gaseous state, and consume a large amount of factory power to compress the gaseous carbon dioxide under normal pressure into a high-pressure state. store.

Description

一种热力发电厂分时二氧化碳捕集存储系统A time-sharing carbon dioxide capture storage system for a thermal power plant

技术领域technical field

本发明属能量储存、节能技术领域，涉及一种二氧化碳捕集存储系统，特别涉及一种热力发电厂分时二氧化碳捕集存储系统，该二氧化碳捕集系统同时利用电厂在用电低谷期所发的电力和用电低谷期汽轮机抽汽所具备的热能。在用电高峰期将烟气中的二氧化碳储存在二氧化碳吸收液中，在用电低谷期利用电厂中多余的热能和电能将二氧化碳从二氧化碳吸收液中析出并压缩储存起来。相比非分时系统，可以实现电能的削峰填谷，容纳更多的可再生能源上网。The invention belongs to the technical field of energy storage and energy saving, and relates to a carbon dioxide capture and storage system, in particular to a time-sharing carbon dioxide capture and storage system for a thermal power plant. The thermal energy possessed by the steam extraction of the steam turbine during the off-peak period of electricity and electricity consumption. Store the carbon dioxide in the flue gas in the carbon dioxide absorbing liquid during the peak period of electricity consumption, and use the excess heat and electricity in the power plant to separate carbon dioxide from the carbon dioxide absorbing liquid and compress it for storage during the low period of electricity consumption. Compared with non-time-sharing systems, it can realize peak-shaving and valley-filling of electric energy, and accommodate more renewable energy to be connected to the grid.

背景技术Background technique

处于工业化大规模发展紧要阶段的中国，能源的消耗也保持稳定较快增长。中国的一次能源以化石能源为主，使得我国的二氧化碳排放量增长迅速，这也导致我国在全球气候变化相关的国际谈判面临越来越大的压力，多次国际气候变化会议都将如何控制中国、印度等发展中国家应该如何实现温室气体的减排提上了重要议程。因此中国的二氧化碳减排以及对全球温室气体控制来说已经变得尤为重要和关键。China, which is in the critical stage of large-scale industrialization, has also maintained a steady and rapid growth in energy consumption. China's primary energy is dominated by fossil energy, which has caused my country's carbon dioxide emissions to grow rapidly. This has also led to increasing pressure on my country in international negotiations related to global climate change. How will many international climate change conferences control China? How to reduce greenhouse gas emissions in developing countries such as China and India has been put on the important agenda. Therefore, China's carbon dioxide emission reduction and global greenhouse gas control have become particularly important and critical.

现有二氧化碳捕集技术包括多种技术形式，其中燃烧后捕获二氧化碳技术主要针对能源动力系统尾部排烟进行分离和捕集，该技术一个重要的特点是二氧化碳捕获设备独立于原动力系统的主体设备，能够更加灵活的使用或装备在种类不同的动力系统中，因此被广泛的应用于以电站为代表的动力装置。Existing carbon dioxide capture technologies include a variety of technical forms, among which post-combustion carbon dioxide capture technology is mainly aimed at the separation and capture of tail smoke from energy power systems. An important feature of this technology is that the carbon dioxide capture equipment is independent of the main equipment of the prime mover system. It can be used more flexibly or equipped in different types of power systems, so it is widely used in power plants represented by power stations.

在二氧化碳捕集系统中的一个步骤是将二氧化碳从液体中析出，这需要大量的热量。该热量来源为汽轮机的抽汽，所以这会影响汽轮机的做功进而影响发电量。同时，将二氧化碳压缩储存或者压缩运输需要大量的电能。One of the steps in the CO2 capture system is to extract the CO2 from the liquid, which requires a lot of heat. The heat source is steam extraction from the steam turbine, so this will affect the work done by the steam turbine and thus affect the power generation. At the same time, storing or transporting carbon dioxide in compression requires a large amount of electrical energy.

发明内容Contents of the invention

针对现有燃烧后二氧化碳捕集系统中在二氧化碳的压缩和析出等环节需要消耗大量热能和电能的问题，本发明的目的是根据居民以及工业用电变化规律，对电厂烟气中的二氧化碳进行分时的捕集，同时利用电厂在用电低谷期所发的电力和用电低谷期汽轮机抽汽所具备的热能，通过合理安排电厂的峰谷时刻用电及抽汽，这有助于对电网削峰填谷，从而可消纳更多风电、光电等可再生能源上网，缓解电力供需关系。Aiming at the problem that the compression and precipitation of carbon dioxide in the existing post-combustion carbon dioxide capture system consumes a lot of heat and electricity, the purpose of this invention is to analyze the carbon dioxide in the flue gas of the power plant according to the changing law of residential and industrial electricity consumption. At the same time, use the power generated by the power plant during the low power consumption period and the heat energy of the steam turbine extraction during the low power consumption period. By reasonably arranging the power consumption and steam extraction of the power plant during the peak and valley periods, this will help the power grid By cutting peaks and filling valleys, more renewable energy such as wind power and photovoltaics can be accommodated online, and the relationship between power supply and demand can be eased.

本发明为实现其技术目的所采取的技术方案为：The technical scheme that the present invention takes for realizing its technical purpose is:

一种热力发电厂分时二氧化碳捕集存储系统，包括贫液储存罐、吸收塔、富液储存罐、再沸器、解析塔、分离器、二氧化碳压缩机和高压二氧化碳存储系统，其特征在于，A time-sharing carbon dioxide capture and storage system for a thermal power plant, comprising a lean liquid storage tank, an absorption tower, a rich liquid storage tank, a reboiler, a desorption tower, a separator, a carbon dioxide compressor, and a high-pressure carbon dioxide storage system, characterized in that,

所述贫液储存罐用以存储二氧化碳吸收液，所述富液储存罐用以存储吸收了二氧化碳的吸收液，The lean liquid storage tank is used to store the carbon dioxide absorbing liquid, and the rich liquid storage tank is used to store the absorbing liquid that has absorbed carbon dioxide,

所述吸收塔下部的烟气进口与热力发电厂的排烟管路连通，The flue gas inlet at the lower part of the absorption tower communicates with the flue gas exhaust pipeline of the thermal power plant,

所述吸收塔上部的二氧化碳吸收液进口与所述贫液储存罐连通，The carbon dioxide absorbing liquid inlet at the upper part of the absorption tower communicates with the lean liquid storage tank,

所述吸收塔顶部的烟气出口与热力发电厂的烟囱连通，The flue gas outlet at the top of the absorption tower communicates with the chimney of the thermal power plant,

所述吸收塔底部的富液出口与所述富液储存罐的进液口连通，The rich liquid outlet at the bottom of the absorption tower communicates with the liquid inlet of the rich liquid storage tank,

在用电高峰期，电厂烟气通入所述吸收塔中，在所述吸收塔中，电厂烟气与二氧化碳吸收液发生接触，烟气中的二氧化碳被二氧化碳吸收液吸收转变为富液，所述富液通过所述吸收塔底部的富液出口进入所述富液储存罐中，剩余烟气从所述吸收塔顶部的烟气出口进入烟囱；During the peak period of power consumption, the flue gas from the power plant is passed into the absorption tower, and in the absorption tower, the flue gas from the power plant contacts the carbon dioxide absorbing liquid, and the carbon dioxide in the flue gas is absorbed by the carbon dioxide absorbing liquid and transformed into a rich liquid, so The rich liquid enters the rich liquid storage tank through the rich liquid outlet at the bottom of the absorption tower, and the remaining flue gas enters the chimney from the flue gas outlet at the top of the absorption tower;

所述解析塔上部的富液进口与所述富液储存罐的出液口连通，The rich liquid inlet on the upper part of the analysis tower communicates with the liquid outlet of the rich liquid storage tank,

所述解析塔顶部的混合气出口通过管路与所述分离器连通，The mixed gas outlet at the top of the analysis tower is communicated with the separator through a pipeline,

所述解析塔底部的液体出口通过管路与所述再沸器的液体进口连通，The liquid outlet at the bottom of the analytical tower is communicated with the liquid inlet of the reboiler through a pipeline,

所述分离器的二氧化碳气体出口通过管路与所述二氧化碳压缩机的进口连通，所述二氧化碳压缩机的出口通过管路与所述高压二氧化碳存储系统连通；所述分离器的凝结水出口通过管路与所述解析塔上部的凝结水进口连通；The carbon dioxide gas outlet of the separator communicates with the inlet of the carbon dioxide compressor through a pipeline, and the outlet of the carbon dioxide compressor communicates with the high-pressure carbon dioxide storage system through a pipeline; the condensate outlet of the separator communicates with the inlet of the carbon dioxide compressor through a pipeline. The road communicates with the condensed water inlet on the upper part of the analytical tower;

所述再沸器的蒸汽进口与电厂汽轮机抽汽管路连通，所述再沸器的气体出口通过管路与所述解析塔下部的气体进口连通，所述再沸器的贫液出口通过管路与所述贫液储存罐连通；The steam inlet of the reboiler is communicated with the steam extraction pipeline of the power plant steam turbine, the gas outlet of the reboiler is communicated with the gas inlet of the lower part of the desorption tower through the pipeline, and the lean liquid outlet of the reboiler is communicated with the gas inlet of the lower part of the desorption tower through the pipeline. The road communicates with the lean liquid storage tank;

在用电低谷期，进入所述解析塔中的富液被解析为二氧化碳和水蒸汽的混合气以及剩余液体，所述分离器中分离出的二氧化碳气体被输送至所述二氧化碳压缩机中，所述二氧化碳压缩机产生的高压二氧化碳被输送至所述高压二氧化碳存储系统；所述分离器中分离出的水蒸汽凝结成水后通过管路返回到所述解析塔中；所述解析塔中产生的剩余液体被输送至所述再沸器中，所述再沸器的蒸汽进口与电厂汽轮机抽汽管路连通，在所述再沸器中所述解析塔中产生的剩余液体与电厂汽轮机抽汽接触后转变为贫液和气体，所述贫液为解析了二氧化碳的吸收液，所述气体通过管路返回到所述解析塔中，所述贫液通过管路被输送至所述贫液储存罐中。During the low power consumption period, the rich liquid entering the desorption tower is decomposed into a mixture of carbon dioxide and water vapor and remaining liquid, and the carbon dioxide gas separated in the separator is transported to the carbon dioxide compressor, so that The high-pressure carbon dioxide produced by the carbon dioxide compressor is transported to the high-pressure carbon dioxide storage system; the water vapor separated in the separator is condensed into water and then returned to the desorption tower through a pipeline; The remaining liquid is sent to the reboiler, and the steam inlet of the reboiler is connected with the extraction steam pipeline of the power plant steam turbine, and the remaining liquid produced in the desorption tower in the reboiler is connected with the extraction steam of the power plant steam turbine. After contact, it turns into lean liquid and gas. The lean liquid is the absorption liquid that has decomposed carbon dioxide. The gas is returned to the desorption tower through the pipeline, and the lean liquid is transported to the lean liquid storage through the pipeline in the can.

优选地，在用电低谷期，所述二氧化碳压缩机所需电能由热力发电厂多余电能提供。Preferably, during the off-peak electricity consumption period, the electric energy required by the carbon dioxide compressor is provided by excess electric energy of the thermal power plant.

优选地，所述二氧化碳压缩机的出口经一二氧化碳冷却器后与所述高压二氧化碳存储系统连通。Preferably, the outlet of the carbon dioxide compressor communicates with the high-pressure carbon dioxide storage system after passing through a carbon dioxide cooler.

优选地，所述贫液储存罐与所述吸收塔上部的二氧化碳吸收液进口之间的连通管路上设有一驱动泵。Preferably, a drive pump is provided on the communication pipeline between the lean liquid storage tank and the carbon dioxide absorption liquid inlet at the upper part of the absorption tower.

优选地，所述吸收塔下部的烟气进口管路上设有一烟气风机。Preferably, a flue gas fan is provided on the flue gas inlet pipeline at the lower part of the absorption tower.

优选地，所述吸收塔底部的富液出口与所述富液储存罐的进液口之间的连通管路上设有一驱动泵。Preferably, a drive pump is provided on the communication pipeline between the rich liquid outlet at the bottom of the absorption tower and the liquid inlet of the rich liquid storage tank.

优选地，所述解析塔上部的富液进口管路上设有一驱动泵。Preferably, a driving pump is provided on the rich liquid inlet pipeline at the upper part of the desorption tower.

优选地，所述再沸器的贫液出口与所述贫液储存罐之间的连通管路上设有一驱动泵。Preferably, a driving pump is provided on the communication pipeline between the lean liquid outlet of the reboiler and the lean liquid storage tank.

优选地，所述二氧化碳压缩机的级数为1。Preferably, the number of stages of the carbon dioxide compressor is one.

优选地，在非电力高峰非电力低谷期，所述系统仍旧运行。Preferably, the system is still running during non-power peak and non-power low-peak periods.

本发明的热力电厂分时二氧化碳捕集存储系统，其基本结构为：①在用电高峰期，通过烟气风机和吸收塔，将电厂的排烟中的二氧化碳储存在二氧化碳吸收液中；②在用电低谷期，利用电厂电能和汽轮机抽汽的热能，通过再沸器和解析塔的作用，将二氧化碳吸收液中的二氧化碳解析成气态，并压缩存储。The time-sharing carbon dioxide capture and storage system of the thermal power plant of the present invention has the basic structure as follows: ① During the peak period of power consumption, the carbon dioxide in the exhaust smoke of the power plant is stored in the carbon dioxide absorbing liquid through the flue gas fan and the absorption tower; During the low power consumption period, the carbon dioxide in the carbon dioxide absorption liquid is decomposed into a gaseous state by using the electric power of the power plant and the heat energy of the steam extraction of the steam turbine through the function of the reboiler and the desorption tower, and compressed and stored.

同现有电厂烟气二氧化碳捕集技术相比，本发明的热力电厂分时二氧化碳捕集存储系统其有益效果：①实现了电能的削峰填谷，在用电低谷期进行二氧化碳的压缩储存，有助于缓解电力供需矛盾并容纳更多可再生能源上网；②在进行二氧化碳的压缩储存时可以消耗汽轮机组的抽汽，从而可以减少汽轮机组做功，进一步实现对电能削峰填谷的作用。Compared with the existing power plant flue gas carbon dioxide capture technology, the time-sharing carbon dioxide capture and storage system of the thermal power plant of the present invention has the following beneficial effects: ① realizes the peak shifting of electric energy and fills the valley, and compresses and stores carbon dioxide during the low power consumption period, It helps to alleviate the contradiction between power supply and demand and accommodate more renewable energy to be connected to the grid; ②The extraction steam of the steam turbine unit can be consumed during the compression and storage of carbon dioxide, thereby reducing the work done by the steam turbine unit and further realizing the peak-shaving and valley-filling effect of electric energy.

附图说明Description of drawings

图1为二氧化碳吸收工况(用电高峰期)运行示意图；Figure 1 is a schematic diagram of the operation of the carbon dioxide absorption working condition (peak electricity consumption period);

图2为二氧化碳解析工况(用电低谷期)运行示意图。Figure 2 is a schematic diagram of the operation of the carbon dioxide analysis working condition (low power consumption period).

具体实施方式Detailed ways

为使本发明的目的、技术方案及优点更加清楚明白，下面结合附图并举实施例，详细描述通过上述实施例，完全有效地实现了本发明的目的。该领域的技术人员可以理解本发明包括但不限于附图和以上具体实施方式中描述的内容。虽然本发明就目前认为最为实用且优选的实施例进行说明，但应知道，本发明并不限于所公开的实施例，任何不偏离本发明的功能和结构原理的修改都将包括在权利要求书的范围中。In order to make the purpose, technical solution and advantages of the present invention clearer, the following embodiments will be described in detail with reference to the accompanying drawings. Through the above embodiments, the purpose of the present invention can be fully and effectively achieved. Those skilled in the art can understand that the present invention includes but is not limited to the contents described in the accompanying drawings and the above specific embodiments. Although the present invention has been described with regard to the most practical and preferred embodiments currently considered, it should be understood that the present invention is not limited to the disclosed embodiments, and any modification that does not depart from the functions and structural principles of the present invention will be included in the claims. in the range.

如图1、2所示，本发明的热力发电厂分时二氧化碳捕集存储系统，与现有热力发电厂配合使用，所述系统会利用热力发电厂的烟气、电厂烟囱、汽轮机抽汽和电厂多余电能。所述系统由贫液储存罐1、泵2、烟气风机3、吸收塔4、泵5、富液储存罐6、泵7、再沸器8、解析塔9、分离器10、泵11、二氧化碳压缩机12和二氧化碳冷却器13等部件组成。贫液储存罐1用以存储二氧化碳吸收液，富液储存罐6用以存储吸收了二氧化碳的吸收液。As shown in Figures 1 and 2, the time-sharing carbon dioxide capture and storage system for thermal power plants of the present invention is used in conjunction with existing thermal power plants. Power plant surplus electricity. The system consists of lean liquid storage tank 1, pump 2, flue gas fan 3, absorption tower 4, pump 5, rich liquid storage tank 6, pump 7, reboiler 8, desorption tower 9, separator 10, pump 11, Carbon dioxide compressor 12, carbon dioxide cooler 13 and other components are composed. The lean liquid storage tank 1 is used to store the carbon dioxide absorbing liquid, and the rich liquid storage tank 6 is used to store the absorbing liquid that has absorbed carbon dioxide.

如图1所示，吸收塔4下部的烟气进口与热力发电厂的排烟管路连通，且在排烟管路上设有烟气风机3；吸收塔4上部的二氧化碳吸收液进口与贫液储存罐1连通，且二者之间的连通管路上设有动力泵2；吸收塔4顶部的烟气出口与热力发电厂的烟囱连通；吸收塔4底部的富液出口与富液储存罐6的进液口连通，且二者之间的连通管路上设有动力泵5；在用电高峰期，电厂烟气通入吸收塔4中，在吸收塔4中，电厂烟气与二氧化碳吸收液发生接触，烟气中的二氧化碳被二氧化碳吸收液吸收转变为富液，富液通过吸收塔4底部的富液出口进入富液储存罐6中，剩余烟气从吸收塔4顶部的烟气出口进入烟囱。As shown in Figure 1, the flue gas inlet at the lower part of the absorption tower 4 communicates with the smoke exhaust pipeline of the thermal power plant, and a flue gas fan 3 is arranged on the smoke exhaust pipeline; The storage tank 1 is connected, and a power pump 2 is arranged on the connecting pipeline between the two; the flue gas outlet at the top of the absorption tower 4 is connected with the chimney of the thermal power plant; the rich liquid outlet at the bottom of the absorption tower 4 is connected with the rich liquid storage tank 6 The liquid inlet is connected, and a power pump 5 is arranged on the connecting pipeline between the two; during the peak period of power consumption, the flue gas of the power plant is passed into the absorption tower 4, and in the absorption tower 4, the flue gas of the power plant and the carbon dioxide absorbing liquid Contact occurs, the carbon dioxide in the flue gas is absorbed by the carbon dioxide absorbing liquid and transformed into rich liquid, the rich liquid enters the rich liquid storage tank 6 through the rich liquid outlet at the bottom of the absorption tower 4, and the remaining flue gas enters from the flue gas outlet at the top of the absorption tower 4 chimney.

如图2所示，解析塔9上部的富液进口与富液储存罐6的出液口连通，且二者之间的连通管路上设有动力泵7；解析塔9顶部的混合气出口通过管路与分离器10连通，解析塔9底部的液体出口通过管路与再沸器8的液体进口连通，分离器10的二氧化碳气体出口通过管路与二氧化碳压缩机12的进口连通，二氧化碳压缩机12的出口通过管路与高压二氧化碳存储系统连通，且二者之间的连通管路上设有一二氧化碳冷却器13；分离器10的凝结水出口通过管路与解析塔9上部的凝结水进口连通；再沸器8的蒸汽进口与电厂汽轮机抽汽管路连通，再沸器8的气体出口通过管路与解析塔9下部的气体进口连通，再沸器8的贫液出口通过管路与贫液储存罐1连通，且二者之间的连通管路上设有动力泵11。在用电低谷期，进入解析塔9中的富液被解析为二氧化碳和水蒸汽的混合气以及剩余液体，分离器10中分离出的二氧化碳气体被输送至二氧化碳压缩机12中，二氧化碳压缩机12产生的高压二氧化碳被输送至高压二氧化碳存储系统；分离器10中分离出的水蒸汽凝结成水后通过管路返回到解析塔9中；解析塔9中产生的剩余液体被输送至再沸器8中，再沸器8的蒸汽进口与电厂汽轮机抽汽管路连通，在再沸器8中解析塔9中产生的剩余液体与电厂汽轮机抽汽接触后转变为贫液和气体，贫液为解析了二氧化碳的吸收液，气体通过管路返回到解析塔9中，贫液通过管路被输送至贫液储存罐1中。As shown in Figure 2, the rich liquid inlet on the upper part of the analysis tower 9 communicates with the liquid outlet of the rich liquid storage tank 6, and a power pump 7 is arranged on the communication pipeline between the two; the mixed gas outlet at the top of the analysis tower 9 passes through The pipeline is communicated with the separator 10, the liquid outlet at the bottom of the analysis tower 9 is communicated with the liquid inlet of the reboiler 8 through the pipeline, the carbon dioxide gas outlet of the separator 10 is communicated with the inlet of the carbon dioxide compressor 12 through the pipeline, and the carbon dioxide compressor The outlet of 12 is communicated with the high-pressure carbon dioxide storage system through pipeline, and a carbon dioxide cooler 13 is arranged on the connecting pipeline between the two; the condensed water outlet of separator 10 is communicated with the condensed water inlet of desorption tower 9 tops through pipeline; The steam inlet of reboiler 8 is connected with steam turbine extraction pipeline of power plant, the gas outlet of reboiler 8 is connected with the gas inlet of desorption tower 9 bottom through pipeline, and the lean liquid outlet of reboiler 8 is connected with lean liquid through pipeline. The storage tank 1 is in communication, and a power pump 11 is arranged on the communication pipeline between the two. During the low power consumption period, the rich liquid entering the desorption tower 9 is resolved into a mixture of carbon dioxide and water vapor and the remaining liquid, and the separated carbon dioxide gas in the separator 10 is transported to the carbon dioxide compressor 12, and the carbon dioxide compressor 12 The generated high-pressure carbon dioxide is transported to the high-pressure carbon dioxide storage system; the water vapor separated in the separator 10 is condensed into water and then returned to the desorption tower 9 through the pipeline; the remaining liquid produced in the desorption tower 9 is transported to the reboiler 8 Among them, the steam inlet of the reboiler 8 is connected with the steam extraction pipeline of the power plant steam turbine, and the remaining liquid produced in the desorption tower 9 in the reboiler 8 is converted into lean liquid and gas after being contacted with the steam extraction steam of the power plant steam turbine, and the lean liquid is analytic The absorption liquid of carbon dioxide is removed, the gas is returned to the desorption tower 9 through the pipeline, and the lean liquid is transported to the lean liquid storage tank 1 through the pipeline.

本发明的热力发电厂分时二氧化碳捕集存储系统，在用电高峰期，二氧化碳处于吸收工况。电厂烟气通过管道进入烟气风机3，然后进入吸收塔4。同时贫液储存罐1中的贫液，即二氧化碳吸收液先经过泵2，也进入吸收塔4。在吸收塔4中，烟气和二氧化碳吸收液发生接触，烟气中的二氧化碳被二氧化碳吸收液吸收，二氧化碳吸收液成为富液(吸收了二氧化碳的吸收液)。剩余烟气从吸收塔4的顶部排出，进入烟囱。富液经过泵5，进入富液储存罐6储存起来。In the time-sharing carbon dioxide capture and storage system of the thermal power plant of the present invention, the carbon dioxide is in the absorbing condition during the peak period of electricity consumption. The power plant flue gas enters the flue gas fan 3 through the pipe, and then enters the absorption tower 4. At the same time, the lean liquid in the lean liquid storage tank 1 , that is, the carbon dioxide absorbing liquid first passes through the pump 2 and then enters the absorption tower 4 . In the absorption tower 4, the flue gas and the carbon dioxide absorbing liquid come into contact, the carbon dioxide in the flue gas is absorbed by the carbon dioxide absorbing liquid, and the carbon dioxide absorbing liquid becomes a rich liquid (absorbing liquid having absorbed carbon dioxide). The remaining flue gas is discharged from the top of the absorption tower 4 and enters the chimney. The rich liquid passes through the pump 5 and enters the rich liquid storage tank 6 for storage.

本发明的热力发电厂分时二氧化碳捕集存储系统，在用电低谷期，二氧化碳处于解析工况。富液储存罐6中的富液经过泵7，进入解析塔9。汽轮机抽汽经过管路进入再沸器8，与解析塔9中流出的液体进行接触。再沸器8中产生的气体通过管路进入解析塔9，再沸器8中产生的液体即贫液(解析了二氧化碳的吸收液)经过泵11，进入贫液储存罐1。解析塔9中的气体(含有水蒸汽和二氧化碳)通过管路进入分离器10，在分离器10中，水蒸汽凝结成水返回到解析塔9，二氧化碳气体则通过管路进入二氧化碳压缩机12。二氧化碳压缩机12的电能来自于用电低谷期电厂多余的电能。被压缩了的二氧化碳经过二氧化碳冷却器13后温度降低，被储存于高压二氧化碳储存系统中。In the time-sharing carbon dioxide capture and storage system of the thermal power plant of the present invention, the carbon dioxide is in the desorption working condition during the low power consumption period. The rich liquid in the rich liquid storage tank 6 enters the desorption tower 9 through the pump 7 . The steam extracted by the steam turbine enters the reboiler 8 through the pipeline, and contacts with the liquid flowing out of the desorption tower 9 . The gas produced in the reboiler 8 enters the desorption tower 9 through the pipeline, and the liquid produced in the reboiler 8, namely the lean liquid (absorption liquid decomposed of carbon dioxide), enters the lean liquid storage tank 1 through the pump 11. The gas (containing water vapor and carbon dioxide) in the analysis tower 9 enters the separator 10 through the pipeline, and in the separator 10, the water vapor condenses into water and returns to the analysis tower 9, and the carbon dioxide gas then enters the carbon dioxide compressor 12 through the pipeline. The electric energy of the carbon dioxide compressor 12 comes from the excess electric energy of the power plant during the off-peak period of electricity consumption. The temperature of the compressed carbon dioxide is lowered after passing through the carbon dioxide cooler 13, and stored in the high-pressure carbon dioxide storage system.

通过上述实施例，完全有效地实现了本发明的目的。该领域的技术人员可以理解本发明包括但不限于附图和以上具体实施方式中描述的内容。虽然本发明就目前认为最为实用且优选的实施例进行说明，但应知道，本发明并不限于所公开的实施例，任何不偏离本发明的功能和结构原理的修改都将包括在权利要求书的范围中。Through the above embodiments, the object of the present invention is fully and effectively achieved. Those skilled in the art can understand that the present invention includes but is not limited to the contents described in the accompanying drawings and the above specific embodiments. Although the present invention has been described with regard to the most practical and preferred embodiments currently considered, it should be understood that the present invention is not limited to the disclosed embodiments, and any modification that does not depart from the functions and structural principles of the present invention will be included in the claims. in the range.

Claims (10)

1. a kind of Thermal Power Station's timesharing collecting carbonic anhydride storage system, including lean solution holding vessel, absorption tower, rich solution storage Tank, reboiler, Analytic Tower, separator, carbon-dioxide gas compressor and high-pressure carbon dioxide storage system, which is characterized in that
The lean solution holding vessel absorbs carbon dioxide to store to store carbon dioxide absorbent solution, the rich solution holding vessel Absorbing liquid,
The gas inlet of the absorption tower lower part is connected to the smoke-exhaust pipeline of Thermal Power Station,
The carbon dioxide absorbent solution import on the absorption tower top is connected to the lean solution holding vessel,
Exhanst gas outlet at the top of the absorption tower is connected to the chimney of Thermal Power Station,
The rich solution outlet of the absorb the bottom of the tower is connected to the inlet of the rich solution holding vessel,
In peak times of power consumption, power-plant flue gas is passed through in the absorption tower, and in the absorption tower, power-plant flue gas and carbon dioxide are inhaled It receives liquid to be in contact, the carbon dioxide in flue gas is changed into rich solution by carbon dioxide absorbent solution absorption, and the rich solution passes through described The rich solution outlet of absorb the bottom of the tower enter the rich solution holding vessel in, remaining flue gas from the exhanst gas outlet at the top of the absorption tower into Enter chimney；
The rich solution import on the Analytic Tower top is connected to the liquid outlet of the rich solution holding vessel,
Mixed gas outlet at the top of the Analytic Tower is connected to by pipeline with the separator,
The liquid outlet of the parsing tower bottom is connected to by pipeline with the liquid-inlet of the reboiler,
The carbon dioxide gas outlet of the separator is by the inlet communication of pipeline and the carbon-dioxide gas compressor, and described two The outlet of carbonoxide compressor is connected to by pipeline with the high-pressure carbon dioxide storage system；The condensed water of the separator goes out Mouth passes through the condensed water inlet communication of pipeline and the Analytic Tower top；
The steam inlet of the reboiler is connected to power plant steam turbine bleed steam pipework, and the gas vent of the reboiler passes through pipeline It is connected to the gas feed of the Analytic Tower lower part, the lean solution outlet of the reboiler is connected by pipeline and the lean solution holding vessel It is logical；
In the low power consumption phase, the gaseous mixture of carbon dioxide and water vapour is resolved into the rich solution in the Analytic Tower and is remained Extraction raffinate body, the carbon dioxide gas isolated in the separator are transported in the carbon-dioxide gas compressor, the dioxy Change the high-pressure carbon dioxide that carbon compressor generates and is transported to the high-pressure carbon dioxide storage system；It is separated in the separator Water recovery Cheng Shuihou out is returned in the Analytic Tower by pipeline；The remaining liq generated in the Analytic Tower is defeated It send into the reboiler, the steam inlet of the reboiler is connected to power plant steam turbine bleed steam pipework, in the reboiler The remaining liq generated in the Analytic Tower is changed into lean solution and gas after contacting with power plant steam turbine steam extraction, the lean solution is solution The absorbing liquid of carbon dioxide is analysed, the gas is returned in the Analytic Tower by pipeline, and the lean solution is defeated by pipeline It send into the lean solution holding vessel.
2. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: Low power consumption phase, electric energy needed for the carbon-dioxide gas compressor are provided by the extra electric energy of Thermal Power Station.
3. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute The outlet for stating carbon-dioxide gas compressor is connected to after a carbon dioxide cooler with the high-pressure carbon dioxide storage system.
4. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute The connecting pipeline stated between lean solution holding vessel and the carbon dioxide absorbent solution import on the absorption tower top is equipped with a transfer tube.
5. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute The flue gas inlet tube road for stating absorption tower lower part is equipped with a flue gas blower.
6. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute The connecting pipeline stated between the rich solution outlet of absorb the bottom of the tower and the inlet of the rich solution holding vessel is equipped with a transfer tube.It is excellent The rich solution inlet ductwork of selection of land, the Analytic Tower top is equipped with a transfer tube.Preferably, the reboiler lean solution outlet with Connecting pipeline between the lean solution holding vessel is equipped with a transfer tube.
7. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute The series for stating carbon-dioxide gas compressor is 1.
8. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: Non-electricity peak non-electricity trough period, the system are still run.
9. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute System is stated to be in when absorbing operating condition, the liquid in the lean solution holding vessel gradually decreases, the liquid in the rich solution holding vessel by Cumulative to add, the only described lean solution holding vessel, rich solution holding vessel, absorption tower are in operating status.
10. Thermal Power Station's timesharing collecting carbonic anhydride storage system according to the claims, it is characterised in that: institute When stating system in parsing operating condition, only above-mentioned lean solution holding vessel, rich solution holding vessel, Analytic Tower, reboiler, separator, dioxy Change carbon compressor and carbon dioxide cooler is in operating status.
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