Carbon capture system after industrial combustion

Abstract

The utility model discloses a carbon capture system after industrial combustion, which belongs to the technical field of carbon capture and comprises an absorption tower and a desorption tower, and the absorption tower is connected with the desorption tower through a barren liquor pipeline and a rich liquor main pipeline; a top outlet of the desorption tower is connected with a condenser through a steam pipeline; the barren liquor pipeline is provided with a barren / rich liquor heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline comprises a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger; the interstage cooling pipeline is arranged on the absorption tower; a second cooler and a first centrifugal pump are arranged on the interstage cooling pipeline in series. Through the interstage cooling pipeline, the interior of the absorption tower which is in reaction is cooled, and the situation that the absorption rate of CO2 is reduced and increased due to temperature rise is avoided; one path of rich liquor passes through a lean / rich liquor heat exchanger and is heated by utilizing waste heat of high-temperature lean liquor, and the other path of rich liquor passes through a heat exchanger and is preheated by utilizing waste heat of high-temperature steam; and the thermodynamic cycle efficiency of the system is optimized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the carbon capture technical field, concretely relates to a kind of industrial combustion post carbon capture system. BACKGROUND

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] Post-combustion capture technology is to separate and recover carbon dioxide from flue gas emitted by fossil fuel combustion;Chemical absorption method is the most widely used method in this technology, which selectively absorbs CO2 by absorbent, and then restores the absorption capacity of absorbent by regeneration process and recovers CO2.

[0004] Current post-combustion carbon capture technology has the following problems:

[0005] 1) It mainly depends on the combustion of fossil fuels to provide the necessary driving energy, which to some extent weakens the environmental benefits of carbon capture technology;

[0006] 2) In the carbon dioxide absorption stage, due to the characteristics of exothermic reaction, high temperature environment appears in the absorption tower, which has adverse effects on the forward of absorption reaction, thereby inhibiting the effective capture of CO2;

[0007] 3) The traditional carbon capture system only sets up the heat exchanger of lean liquid / rich liquid, and only heats the rich liquid by the lean liquid, which still has defects in heat energy utilization efficiency. UTILITY MODEL CONTENT

[0008] In view of the above problems, the utility model provides an industrial combustion post carbon capture system, which provides clean energy power for carbon capture system by setting up photovoltaic power supply system, reduces carbon emission, reduces the comprehensive energy consumption ratio of carbon capture and storage process;The interstage cooling pipeline is arranged in the middle part of the absorption tower to cool the inside of the absorption tower being reacted, so as to avoid the decrease of CO2 absorption rate and overall capture efficiency due to the increase of reaction tower internal temperature;The rich liquid pipeline is divided into two ways, one way of rich liquid passes through lean / rich liquid heat exchanger to heat by using the waste heat of high-temperature lean liquid, and the other way of rich liquid passes through heat exchanger to preheat by using the waste heat of high-temperature steam discharged from desorption tower in steam pipeline;Optimize the thermal cycle efficiency of system, reduce energy consumption index, enhance the sustainability and economy of system.

[0009] To achieve the above purpose, the utility model adopts the following technical solutions:

[0010] An industrial combustion post carbon capture system, comprising an absorption tower and a desorption tower, the absorption tower is connected with the desorption tower through lean liquid pipeline and rich liquid main pipeline;The top outlet of desorption tower is connected with condenser through steam pipeline;

[0011] The lean liquid pipeline is provided with a lean / rich liquid heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline comprises a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger.

[0012] Further comprising an inter-stage cooling pipeline, one end of which is connected to the middle outlet of the absorption tower, and the other end of which is connected to the middle inlet of the absorption tower; the inter-stage cooling pipeline is provided with a second cooler, a fourth regulating valve and a first centrifugal pump in series.

[0013] Preferably, the condenser is connected to the compressor and the carbon storage tank through an exhaust pipeline, the exhaust pipeline is provided with an exhaust valve and a third stop valve, wherein the exhaust valve is arranged between the condenser and the compressor, and the third stop valve is arranged between the compressor and the carbon storage tank.

[0014] Preferably, one end of the lean liquid pipeline is connected to the top inlet of the absorption tower, and the other end is connected to the bottom first outlet of the desorption tower.

[0015] Preferably, starting from the desorption tower, the lean liquid pipeline is sequentially provided with a second regulating valve, a first lean liquid pump, a lean / rich liquid heat exchanger, a first cooler, a third regulating valve and a second lean liquid pump in series.

[0016] Preferably, one end of the rich liquid main pipeline is connected to the bottom outlet of the absorption tower, and the other end is provided with a rich liquid pump, the rich liquid pump is divided into a first rich liquid pipeline and a second rich liquid pipeline at the outlet thereof, the first rich liquid pipeline is connected to the upper first inlet of the desorption tower, and the second rich liquid pipeline is connected to the upper second inlet of the desorption tower.

[0017] Preferably, a fifth regulating valve is arranged between the rich liquid pump and the bottom outlet of the absorption tower; a first stop valve is arranged on the first rich liquid pipeline, and a second stop valve is arranged on the second rich liquid pipeline.

[0018] Preferably, the steam pipeline is further provided with a steam pump and a sixth regulating valve, and the sixth regulating valve, the steam pump and the heat exchanger are sequentially connected in series starting from the desorption tower.

[0019] Preferably, the bottom second outlet of the desorption tower is connected to the bottom inlet through a circulation pipeline, and the circulation pipeline is sequentially provided with a reboiler, a seventh regulating valve and a second centrifugal pump in series.

[0020] Preferably, the bottom inlet of the absorption tower is connected to a flue gas conveying pipeline, the flue gas conveying pipeline is provided with a first regulating valve and a fan in series; the top outlet of the absorption tower is connected to a flue gas exhaust pipeline, and the flue gas exhaust pipeline is provided with an eighth regulating valve.

[0021] Preferably, the photovoltaic power supply system further comprises a photovoltaic panel, the photovoltaic panel is connected with an inverter through a first cable, the inverter is connected with a transformer through a second cable, and the transformer is connected with the fan, the condenser, the compressor, the first lean liquid pump, the second lean liquid pump, the first centrifugal pump, the rich liquid pump, the steam pump and the second centrifugal pump through a main cable.

[0022] Compared with the prior art, the utility model has the advantages and positive effects that:

[0023] The utility model discloses a solar photovoltaic power generation technology, through efficient photoelectric conversion process, provide clean energy power for carbon capture system, the dependence of system on fossil energy and overall energy consumption are reduced significantly, utilize renewable energy photovoltaic power generation, reduce carbon emission, reduce the comprehensive energy consumption ratio of carbon capture and storage process.

[0024] The utility model discloses the middle part of the absorption tower is provided with interstage cooling pipeline, and the inside of the absorption tower that is reacting is cooled, avoids the absorption rate of CO2 and overall capture efficiency because of the temperature of the reaction tower inside and reduces the increase.

[0025] The utility model discloses the rich liquid pipeline is divided into two ways, one way rich liquid passes through lean / rich liquid heat exchanger and utilizes high temperature lean liquid's waste heat to heat, another way rich liquid passes through heat exchanger, utilizes the high temperature steam waste heat of desorption tower discharge in steam pipeline and carries out preheating, optimized the thermal cycle efficiency of system, reduced energy consumption index, strengthened the sustainability and economy of system. BRIEF DESCRIPTION OF DRAWINGS

[0026] The description and drawings of the utility model constitute a part of the utility model and are used to provide further understanding on the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0027] Figure 1 It is the schematic diagram of carbon capture system of the utility model embodiment;

[0028] In the drawing:

[0029] 101. Photovoltaic panel; 102. Inverter; 103. Transformer; 201. Absorption tower; 202. Desorption tower; 301. Condenser; 302. Compressor; 303. Carbon storage tank; 4. Flue gas pipeline; 401. First regulating valve; 402. Fan; 5. Lean solution pipeline; 501. Second regulating valve; 502. First lean solution pump; 503. Lean / rich solution heat exchanger; 504. First cooler; 505. Third regulating valve; 506. Second lean solution pump; 6. Interstage cooling pipeline; 601. Second cooler; 602. Fourth regulating valve; 603. First centrifugal pump; 7. Rich liquor main pipeline; 701, fifth regulating valve; 702, rich liquor pump; 8, first rich liquor pipeline; 801, first shut-off valve; 9, second rich liquor pipeline; 901, heat exchanger; 902, second shut-off valve; 10, steam pipeline; 104, steam pump; 105, sixth regulating valve; 11, exhaust pipeline; 111, exhaust valve; 112, third shut-off valve; 12, circulation pipeline; 121, seventh regulating valve; 122, second centrifugal pump; 123, reboiler; 13, first cable; 14, second cable; 15, main cable; 16, flue gas exhaust pipeline; 161, eighth regulating valve. Detailed Implementation

[0030] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses an industrial post-combustion carbon capture system, such as... Figure 1 As shown, the system includes an absorption tower 201, the bottom inlet of which is connected to the flue gas transmission pipeline 4; the top inlet of the absorption tower 201 is connected to the lean liquid pipeline 5, and the bottom outlet of the absorption tower 201 is connected to the rich liquid main pipeline 7. The absorption tower 201 is connected to the desorption tower 202 through the lean liquid pipeline 5 and the rich liquid main pipeline 7. The top outlet of the desorption tower 202 is connected to the condenser 301 through the steam pipeline 10. The condenser 301 is connected to the compressor 302 and the carbon storage tank 303 through the exhaust pipeline 11.

[0032] In the embodiment, the flue gas pipeline 4 is used to send the flue gas containing carbon dioxide into the absorption tower 201, the lean liquid pipeline 5 is used to send the lean liquid absorbent into the absorption tower 201 to contact with the flue gas, the lean liquid absorbent absorbs the carbon dioxide in the flue gas to form the rich liquid in the saturated state, the rich liquid flows out from the bottom outlet of the absorption tower 201 and reaches the desorption tower 202 through the rich liquid main pipeline 7 to be desorbed, the rich liquid releases the carbon dioxide in the desorption tower 202 and becomes the lean liquid absorbent again, and the lean liquid absorbent returns to the absorption tower 201 through the lean liquid pipeline 5; the carbon dioxide and water mixed steam released in the desorption tower enter the condenser 301 through the steam pipeline 10 to be cooled and separated, the carbon dioxide is compressed by the compressor 302 and stored in the carbon storage tank 303.

[0033] In the embodiment, the lean liquid absorbent used is a mixed solution of methyldiethanolamine (MDEA) and piperazine (PZ). The optimal absorption temperature of the reaction tower is 20-60°C, and the optimal desorption temperature of the desorption tower is 90-120°C.

[0034] As shown in Figure 1 , the flue gas pipeline 4 includes a first regulating valve 401 and a fan 402 arranged in series, the fan 402 is used to blow the flue gas in the flue gas pipeline 4 into the absorption tower 201, and the first regulating valve 401 is used to adjust the amount of flue gas sent into the bottom of the absorption tower 201.

[0035] As shown in Figure 1 , the middle part of the absorption tower 201 is provided with a circulating inter-stage cooling pipeline 6; one end of the inter-stage cooling pipeline 6 is connected to the middle outlet of the absorption tower 201, and the other end is connected to the middle inlet of the absorption tower 201; on the inter-stage cooling pipeline 6, a second cooler 601, a fourth regulating valve 602 and a first centrifugal pump 603 are arranged in series; wherein the second cooler 601 is arranged close to the middle outlet of the absorption tower 201, the first centrifugal pump 603 is arranged close to the middle inlet of the absorption tower 201, and the fourth regulating valve 602 is arranged between the second cooler 601 and the first centrifugal pump 603.

[0036] Since the forward reaction of the lean liquid absorbent and CO2 is an exothermic reaction, the continuous heat release will cause a high temperature environment in the absorption tower, which will adversely affect the forward of the absorption reaction; therefore, in the middle part of the absorption tower 201, the first centrifugal pump 603 sends part of the lean liquid absorbent to the second cooler 601 through the inter-stage cooling pipeline 6 for cooling, and then sends it back to the middle part of the absorption tower 201 to reduce the temperature inside the absorption tower 201, so that the temperature inside the absorption tower 201 is kept at the optimal absorption temperature, thereby improving the efficiency of the lean liquid absorbent. The lean liquid absorbent is continuously cooled through the inter-stage cooling pipeline to overcome the temperature rise problem caused by the exothermic reaction, so that the temperature inside the absorption tower is stabilized in the optimal reaction range, and the system is ensured to run efficiently.

[0037] AsFigure 1 As shown, the top inlet of the absorption tower 201 is connected to one end of the lean liquid pipeline 5, and the other end of the lean liquid pipeline 5 is connected to the first outlet at the bottom of the desorption tower 202. Starting from the desorption tower, the lean liquid pipeline 5 is sequentially connected in series with a second regulating valve 501, a first lean liquid pump 502, a lean / rich liquid heat exchanger 503, a first cooler 504, a third regulating valve 505, and a second lean liquid pump 506. Opening the second regulating valve 501 and the third regulating valve 505, and opening the first lean liquid pump 502 and the second lean liquid pump 506, draws the lean liquid out of the desorption tower 202, exchanges heat through the lean / rich liquid heat exchanger 503, and cools it to the optimal absorption temperature through the first cooler 504 before sending it into the absorption tower 201. In this embodiment, the temperature of the cooled lean liquid absorbent is 20°C.

[0038] In this embodiment, the main functions of setting up two lean solution pumps (first lean solution pump and second lean solution pump) on the lean solution pipeline are: firstly, to pressurize in stages: when a single pump cannot meet the pressure or flow required by the system, the series connection of two pumps can achieve pressurization in stages, ensuring that the lean solution absorbent can be stably delivered to the top of the absorption tower; secondly, the dual pump configuration improves the reliability of the system. If one pump fails, the other pump can still continue to operate, avoiding system shutdown due to pump failure.

[0039] In this embodiment, the function of setting two regulating valves (a second regulating valve and a third regulating valve) on the lean liquid pipeline is as follows: the second regulating valve is located before the pump inlet and is used to regulate the flow rate entering the first lean liquid pump to prevent the pump from overloading or running dry; the third regulating valve is located after the first cooler and before the second lean liquid pump and is used to control the output flow rate of the lean liquid after cooling to ensure the supply and temperature of the lean liquid absorbent in the absorption tower are stable.

[0040] like Figure 1 As shown, the top outlet of the desorption tower 202 is connected to the condenser 301 via a steam pipeline 10. Starting from the desorption tower 202, a sixth regulating valve 105, a steam pump 104, and a heat exchanger 901 are sequentially connected in series on the steam pipeline 10. The sixth regulating valve is used to regulate the steam flow rate entering the steam pump. The sixth regulating valve 105 is opened, and then the steam pump 104 is turned on to draw the carbon dioxide and water mixture steam in the desorption tower into the steam pipeline 10. After passing through the heat exchanger 901, it is sent to the condenser 301 for cooling and separation.

[0041] like Figure 1As shown, the exhaust pipe 11 is equipped with an exhaust valve 111 and a third shut-off valve 112. The exhaust valve 111 is located between the condenser 301 and the compressor 302, and the third shut-off valve 112 is located between the compressor 302 and the carbon storage tank 303. When the exhaust valve 111 is opened, the carbon dioxide separated by cooling in the condenser 301 enters the compressor 302 through the exhaust pipe 11. When the third shut-off valve 112 is opened, the carbon dioxide compressed by the compressor 302 enters the carbon storage tank 303 for storage.

[0042] like Figure 1 As shown, the bottom outlet of the absorption tower 201 is connected to the rich liquid main pipeline 7, which is equipped with a fifth regulating valve 701 and a rich liquid pump 702. At the outlet of the rich liquid pump 702, the rich liquid main pipeline 7 is divided into a first rich liquid pipeline 8 and a second rich liquid pipeline 9. The first rich liquid pipeline 8 is connected to the upper first inlet of the desorption tower 202, and the second rich liquid pipeline 9 is connected to the upper second inlet of the desorption tower 202.

[0043] like Figure 1 As shown, a first shut-off valve 801 is installed on the first rich liquid pipeline 8, and the first rich liquid pipeline 8 passes through the lean / rich liquid heat exchanger 503; when the first shut-off valve 801 is opened, the fifth regulating valve 701 and the rich liquid pump 702 are opened at the same time, so that the rich liquid in the first rich liquid pipeline 8 flows through the lean / rich liquid heat exchanger 503 to exchange heat with the lean liquid in the lean liquid pipeline and then enters the desorption tower 202.

[0044] like Figure 1 As shown, a second shut-off valve 902 is installed on the second rich liquid pipeline 9, and the second rich liquid pipeline 9 passes through a heat exchanger 901; when the second shut-off valve 902 is opened, the fifth regulating valve 701 and the rich liquid pump 702 are opened at the same time, so that the rich liquid in the second rich liquid pipeline 9 flows through the heat exchanger 901 and exchanges heat with the steam and carbon dioxide in the steam pipeline 10 before entering the desorption tower 202.

[0045] like Figure 1 As shown, the second outlet at the bottom of the desorption tower 202 is connected to the bottom inlet of the desorption tower 202 via a circulation pipeline 12. A reboiler 123, a seventh regulating valve 121, and a second centrifugal pump 122 are connected in series on the circulation pipeline 12. The reboiler 123 is located near the second outlet at the bottom of the desorption tower 202, the second centrifugal pump 122 is located near the bottom inlet of the desorption tower 202, and the seventh regulating valve 121 is located between the reboiler 123 and the second centrifugal pump 122.

[0046] The seventh regulating valve 121 and the second centrifugal pump 122 are opened, the rich liquid at the bottom of the desorption tower 202 is pumped out, heated by the reboiler 123, and then sent into the desorption tower 202, so that the temperature in the desorption tower 202 is increased, which is beneficial to the desorption of carbon dioxide from the rich liquid. It can be understood that the reboiler 123 is heated by high-temperature flue gas, and its function is to heat the rich liquid flowing through the reboiler 123.

[0047] It can be understood that the second regulating valve 501 is closed, and the seventh regulating valve 121 and the second centrifugal pump 122 are opened to heat the rich liquid in the desorption tower 202; the rich liquid becomes lean liquid after the desorption of carbon dioxide in the desorption tower, at this time the seventh regulating valve 121 is closed and the second regulating valve 501 is opened, so that the lean liquid enters the lean liquid pipeline 5 from the desorption tower 202.

[0048] In the traditional process, only the rich / lean liquid heat exchanger is used to heat the rich liquid, and the single heat source heat exchange makes the temperature of the rich liquid entering the desorption tower not obviously increased; in this embodiment, the rich liquid is divided into two paths and heat exchanged by the rich / lean liquid heat exchanger 503 and the heat exchanger 901 respectively, so that the temperature of the rich liquid entering the desorption tower is obviously increased. The waste heat in the system can be efficiently recovered and utilized, and the burden of the reboiler 123, the first cooler 504 and the condenser 301 is reduced, and the energy consumption is reduced.

[0049] As shown in Figure 1 , it also includes a photovoltaic power supply system, the photovoltaic power supply system includes a photovoltaic panel 101, the photovoltaic panel 101 is connected to an inverter 102 through a first cable 13, the inverter 102 is connected to a transformer 103 through a second cable 14; the transformer 103 is connected to the condenser 301, the compressor 302, the fan 402, the first lean liquid pump 502, the second lean liquid pump 506, the first centrifugal pump 603, the rich liquid pump 702, the steam pump 104 and the second centrifugal pump 122 through a main cable 15.

[0050] As shown in Figure 1 , the top outlet of the absorption tower 201 is connected to a flue gas exhaust pipeline 16, and the eighth regulating valve 161 is arranged on the flue gas exhaust pipeline 16 to adjust the flow in the flue gas exhaust pipeline 16.

[0051] Working principle:

[0052] The direct current power generated by the photovoltaic panel 101 is transmitted to the inverter 102 through the first cable 13, and the inverter 102 undertakes the conversion function of converting the direct current power into alternating current power. Subsequently, the alternating current power is transmitted to the transformer 103 through the second cable 14. In the transformer 103, the current and voltage are accurately adjusted, and are distributed to each power consumption end through the main cable 15, to ensure the power supply quality and stability of the power consumption equipment.

[0053] The cooled flue gas enters the absorption tower 201 through the flue gas pipeline 4 under the action of the fan 402, and is in contact with the lean liquid absorbent from the second lean liquid pump 506 in the absorption tower 201. Since the positive reaction of the lean liquid absorbent and CO2 is an exothermic reaction, in the middle part of the absorption tower 201, the first centrifugal pump 603 sends part of the lean liquid absorbent to the second cooler 601 through the inter-stage cooling pipeline 6 for cooling, and then sends it back to the middle part of the absorption tower 201, so as to reduce the temperature of the absorption tower 201 and improve the efficiency of the lean liquid absorbent.

[0054] The carbon dioxide in the flue gas is effectively captured by chemical reaction with the lean liquid absorbent, and the remaining gas is discharged from the top of the absorption tower 201 through the flue gas exhaust pipeline 16. At this time, the rich liquid pump 702 draws the rich liquid from the bottom of the absorption tower 201 through the rich liquid main pipeline 7, and then divides at the outlet of the rich liquid pump 702. Part of the rich liquid enters the first rich liquid pipeline 8, and the other part enters the second rich liquid pipeline 9.

[0055] The rich liquid in the first rich liquid pipeline 8 exchanges heat with the high-temperature lean liquid from the first lean liquid pump 502 in the lean / rich liquid heat exchanger 503, and then the lean liquid absorbent enters the first cooler 504 through the lean liquid pipeline 5 for further cooling, while the heated rich liquid enters the desorption tower 202 for desorption.

[0056] The rich liquid in the second rich liquid pipeline 9 enters the heat exchanger 901, and at the same time, the carbon dioxide and water mixed steam discharged from the top of the desorption tower 202 enters the heat exchanger 901 through the steam pipeline 10 under the action of the steam pump 104, and exchanges heat with the rich liquid. Then this part of the rich liquid also enters the desorption tower 202; the mixed steam enters the condenser 301 through the steam pipeline 10 under the drive of the steam pump 104 for cooling and separation, and the carbon dioxide enters the carbon storage tank 303 after being compressed by the compressor 302 for storage.

[0057] The rich liquid in the desorption tower 202 is heated by the reboiler 123, and is sent back to the tower by the second centrifugal pump 122 through the circulation pipeline 12 for regeneration; the regenerated lean liquid is sent back to the absorption tower 201 by the first lean liquid pump 502 through the lean liquid pipeline 5 for recycling.

[0058] Although the specific embodiments of the present application have been described in conjunction with the accompanying drawings, they are not intended to limit the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations can be made to the technical solutions of the present application without creative labor, and still within the scope of protection of the present application.

Claims

1. An industrial post-combustion carbon capture system, characterized in that, The absorption tower and the desorption tower are connected by a lean liquid pipeline and a rich liquid main pipeline; the top outlet of the desorption tower is connected to a condenser through a steam pipeline; The lean liquid pipeline is provided with a lean / rich liquid heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline includes a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger; The lean liquid pipeline is provided with a lean / rich liquid heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline includes a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger; 2. An industrial post-combustion carbon capture system as claimed in claim 1, characterised in that, The condenser is connected to a compressor and a carbon storage tank through an exhaust pipeline, and the exhaust pipeline is provided with an exhaust valve and a third stop valve, wherein the exhaust valve is arranged between the condenser and the compressor, and the third stop valve is arranged between the compressor and the carbon storage tank.

3. An industrial post-combustion carbon capture system as claimed in claim 1, characterised in that, One end of the lean liquid pipeline is connected to the top inlet of the absorption tower, and the other end is connected to the bottom first outlet of the desorption tower.

4. An industrial post-combustion carbon capture system as claimed in claim 1, characterised in that, The lean liquid pipeline is provided with a lean / rich liquid heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline includes a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger; 5. An industrial post-combustion carbon capture system as claimed in claim 1, wherein, One end of the lean liquid pipeline is connected to the top inlet of the absorption tower, and the other end is connected to the bottom first outlet of the desorption tower.

6. An industrial post-combustion carbon capture system as claimed in claim 5, characterised in that, The lean liquid pipeline is provided with a lean / rich liquid heat exchanger; the steam pipeline is provided with a heat exchanger; the rich liquid main pipeline includes a first rich liquid pipeline passing through the lean / rich liquid heat exchanger and a second rich liquid pipeline passing through the heat exchanger; 7. An industrial post-combustion carbon capture system as claimed in claim 1, wherein, The steam pipeline is further provided with a steam pump and a sixth regulating valve, and the sixth regulating valve, the steam pump and the heat exchanger are sequentially connected starting from the desorption tower.

8. An industrial post-combustion carbon capture system as claimed in claim 1, wherein, The bottom second outlet of the desorption tower is connected to the bottom inlet through a circulation pipeline, and the circulation pipeline is sequentially connected with a reboiler, a seventh regulating valve and a second centrifugal pump.

9. An industrial post-combustion carbon capture system as claimed in claim 1, wherein, The bottom inlet of the absorption tower is connected to a flue gas pipeline, and the flue gas pipeline is sequentially provided with a first regulating valve and a fan; the top outlet of the absorption tower is connected to a flue gas exhaust pipeline, and the flue gas exhaust pipeline is provided with an eighth regulating valve.

10. An industrial post-combustion carbon capture system as claimed in claim 9, characterised in that, The photovoltaic power supply system includes a photovoltaic panel, an inverter connected to the photovoltaic panel through a first cable, a transformer connected to the inverter through a second cable; the transformer is connected to the fan, the condenser, the compressor, the first lean liquid pump, the second lean liquid pump, the first centrifugal pump, the rich liquid pump, the steam pump and the second centrifugal pump through a main cable.

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