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

Abstract

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.

Description

Carbon dioxide capture system powered by coal-fired steam injection boiler system

technical field

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.

Background technique

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.

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.

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.

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.

Utility model content

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.

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.

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.

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.

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.

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.

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.

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.

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;

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.

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;

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;

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;

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;

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;

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;

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;

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.

In one embodiment, a coal-fired steam injection boiler system includes a boiler deaerator, a boiler drum and a steam injection boiler body.

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.

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.

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.

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.

In one embodiment, the boiler deaerator further comprises: a second inlet of the boiler deaerator.

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.

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.

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.

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.

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,

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;

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;

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.

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.

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.

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.

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.

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.

The beneficial effects of the present utility model are as follows:

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.

Description of drawings

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.

Among them, the reference numerals are described as follows:

11 Absorption tower 173 Steam injection boiler body

11A1 The first inlet of the absorption tower 173A The inlet of the steam injection boiler

11A2 The second inlet of the absorption tower 173B1 The first outlet of the steam injection boiler body

11B1 absorption tower first outlet

11B2 The second outlet of the absorption tower 173B2 The second outlet of the steam injection boiler body

12 Rich liquid pump

13 Lean rich liquid heat exchanger 18 Turbogenerator

13A1 lean-rich liquid heat exchanger first inlet 18A steam turbine generator steam inlet

13A2 The second inlet of the lean-rich liquid heat exchanger 18B The steam outlet of the steam turbine generator

13B1 The first outlet of the lean and rich liquid heat exchanger 18C steam turbine generator power generation interface

13B2 Lean and rich liquid heat exchanger second outlet 19 Boiler

14 Desorption tower 19A1 boiler first inlet

14A1 The first inlet of the desorption tower 19A2 The second inlet of the boiler

14A2 The second inlet of the desorption tower 19B1 The first outlet of the boiler

14B1 The first outlet of the desorption tower 19B2 The second outlet of the boiler

14B2 second outlet of desorption tower 20 regeneration gas cooler

14B3 The third outlet of the desorption tower 20A1 The first inlet of the regeneration gas cooler

15 lean liquid pump 20A2 regeneration gas cooler second inlet

16 Lean liquid cooler 20B1 First outlet of regeneration gas cooler

16A1 First inlet of lean liquid cooler 20B2 Second outlet of regeneration gas cooler

16A2 lean liquid cooler second inlet 21 compressor

16B1 lean liquid cooler first outlet 21A compressor inlet

16B2 Second outlet of lean liquid cooler 21B compressor outlet

17 Coal-fired steam injection boiler system 22 Compressed gas cooler

171 boiler deaerator 22A1 compressed air cooler first inlet

171A1 Boiler deaerator first inlet 22A2 Compressed gas cooler second inlet

171A2 Boiler deaerator second inlet 22B1 Compressed gas cooler first outlet

171B boiler deaerator outlet 22B2 second outlet of compressed air cooler

172 boiler drum 23 induced draft fan

172A1 Boiler drum first inlet 23A induced draft fan inlet

172A2 The second inlet of the boiler drum 23B The outlet of the induced draft fan

172B Boiler drum outlet

Detailed ways

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 .

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 .

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.

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.

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;

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.

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.

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).

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.

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;

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;

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;

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;

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;

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;

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;

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;

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 .

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.

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.

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 .

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.

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.

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.

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.

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.

The boiler deaerator 171 further includes: a second inlet 171A2 of the boiler deaerator.

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 .

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.

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.

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.

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,

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;

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;

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.

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.

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.

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.

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.

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.

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.

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