Cylinder-switching combined heat and power multi-mode operation system coupled with carbon capture device

Abstract

According to the technical scheme, a steam exhaust pipeline of an intermediate-pressure cylinder is divided into three branches, according to the first branch, the intermediate-pressure cylinder of a steam turbine is connected with a low-pressure cylinder of the steam turbine through an intermediate-low pressure cylinder communicating pipe; the second branch is that the medium-pressure cylinder is connected with the heat supply network heater through a steam extraction pipeline, a heat supply steam extraction check valve, a heat supply steam extraction regulating valve and a heat supply steam extraction shut-off valve; according to the third branch, the medium-pressure cylinder is connected with the trapping device reboiler through a carbon trapping and steam extraction check valve, a carbon trapping and steam extraction regulating valve, a carbon trapping and steam extraction shut-off valve and a carbon trapping and steam extraction cooler in sequence through a steam extraction pipeline. The utility model has the beneficial effects that the multi-mode operation of power generation, heat supply and carbon capture can be realized, and a power plant can obtain the maximum economic benefit on the premise of determining a preferential operation mode and meeting the heat supply or decarburization requirement of a unit by optimizing different power generation steam flows, heat supply steam flows and carbon capture steam flows.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat and power cogeneration multi-mode operation system, in particular to a cut cylinder heat and power cogeneration multi-mode operation system coupled with a carbon capture device. BACKGROUND

[0002] With the development of global economy, people's demand for energy is increasing, and the emission of greenhouse gases dominated by CO2 has caused global temperature rise and frequent extreme weather and other environmental problems. Therefore, China encourages the development of renewable energy to cope with the difficulties. Although China has made great progress in renewable energy, it still relies heavily on fossil fuels. In 2020, about 85% of China's total primary energy demand was met by fossil fuels. This shows that China will maintain a coal-based primary energy consumption structure for a long time in the future, and it is of great significance to transform coal-fired units for carbon capture and storage (CCS). The current chemical absorption method of carbon capture technology needs to extract a large amount of steam from the turbine system of the unit, and the condensation heat of the steam provides heat for the regeneration of the absorbent.

[0003] Chinese patent application No. CN202211196982.7, entitled "Flue gas carbon capture system and method", the system includes a carbon capture unit and a coal-fired unit, flue gas is transported to the carbon capture absorption tower by the carbon capture suction fan, the generated rich liquid enters the lean-rich liquid heat exchanger and the regeneration tower in turn, the rich liquid in the regeneration tower circulates into the reboiler for heating and returns to the regeneration tower; The lean liquid generated in the regeneration tower is heat exchanged with the rich liquid in the lean-rich liquid heat exchanger and reused in the carbon capture absorption tower; The superheated steam from the intermediate pressure cylinder or high pressure cylinder of the steam turbine is utilized in turn by the desulfurization induced draft fan and the carbon capture suction fan, and the obtained heat supply steam is heat exchanged with the rich liquid in the reboiler.

[0004] Chinese patent application No. CN202311014230.9, entitled "Carbon capture and carbon recycling system coupled with geothermal energy", includes a carbon capture module, a power generation module, a compression injection module, and a geothermal module; the geothermal module heat source channel wellhead is connected with the evaporator of the power generation module, an Organic Rankine Cycle low-temperature waste heat generator is used, the exhaust steam generated by the steam turbine unit directly heats the absorption tower of the carbon capture module, the power generation module is used to supply power to the carbon capture device and the compression injection module, the present invention couples three cycles of carbon cycle, heat cycle and electricity cycle, and can realize normal operation of the carbon capture system without external power supply.

[0005] Chinese patent application No. CN201810521013.1, entitled "A combined heat supply system of a gas-steam combined cycle and a decarbonization system", comprises interconnected: a gas-steam combined cycle unit, a carbon dioxide capture unit and a user heat network unit; the waste heat boiler in the gas-steam combined cycle unit is connected with the compressor and the air blower through the low-temperature flue gas heat exchanger respectively; the carbon dioxide capture unit comprises an air blower, an absorption tower, a lean-liquid rich-liquid heat exchanger, a stripping tower, a reboiler, a carbon dioxide separator and a carbon dioxide compression unit; the carbon dioxide compression unit releases carbon dioxide through the first heat exchanger, the reboiler is connected with the medium-pressure cylinder of the steam turbine through the second heat exchanger, and the reboiler is connected with the waste heat boiler through the third heat exchanger; the user heat network unit is connected with the heat network user through the fourth heat exchanger, and the heat network circuit composed of the fourth heat exchanger, the low-temperature flue gas heat exchanger, the third heat exchanger, the first heat exchanger and the second heat exchanger is sequentially connected in a loop.

[0006] In addition, coal-fired generating units are also the main force of heat supply, and combined heat and power units are the main development direction of centralized heat supply, which puts forward higher requirements for the heat supply extraction amount of the steam turbine system, and produces the contradiction between steam turbine extraction for carbon capture and heat supply.

[0007] Therefore, it is necessary to provide an improved operation scheme to improve the scene adaptability of the combined heat and power unit, improve the diversified scheduling capability, and realize the maximum economic benefit of the unit under the condition of meeting the electricity, heat load and carbon emission reduction demand. Practical new type content

[0008] The utility model aims at the above-mentioned defects existing in prior art, provides a cut cylinder combined heat and power multi-mode operation system of carbon capture device, realizes the reasonable distribution of electricity, heat load and carbon capture amount on the basis of guaranteeing the long-term reliable operation of the unit, makes the power plant obtain the maximum economic benefit.

[0009] The utility model discloses a kind of coupling carbon capture device's cutting cylinder combined heat and power multi-mode operation system, its technical scheme is: including middle pressure cylinder (1), low pressure cylinder (2), generator (3), condenser (4), condensate pump (5), middle-low pressure cylinder communication pipe (6), wherein, still including steam extraction pipeline (7), middle discharge regulating valve (8), heating steam extraction check valve (9), heating steam extraction regulating valve (10), heating steam extraction shutoff valve (11), carbon capture steam extraction check valve (12), carbon capture steam extraction regulating valve (13), carbon capture steam extraction shutoff valve (14), heat network heater (15), carbon capture steam extraction cooler (16), capture device reboiler (17), carbon capture steam extraction pump (21), the exhaust pipe of middle pressure cylinder (1) is divided into three branches, first branch is that middle pressure cylinder (1) of steam turbine is connected with low pressure cylinder (2) of steam turbine by middle-low pressure cylinder communication pipe (6), middle-low pressure cylinder communication pipe (6) is provided with middle discharge regulating valve (8) for adjusting the steam flow and pressure of entering low pressure cylinder (2);Second branch is that middle pressure cylinder (1) is connected with heat network heater (15) by steam extraction pipeline (7), heating steam extraction check valve (9), heating steam extraction regulating valve (10), heating steam extraction shutoff valve (11);Third branch is that middle pressure cylinder (1) is sequentially connected carbon capture steam extraction check valve (12), carbon capture steam extraction regulating valve (13), carbon capture steam extraction shutoff valve (14) and carbon capture steam extraction cooler (16) by steam extraction pipeline (7), and then is connected with capture device reboiler (17).

[0010] Preferably, the above-mentioned middle discharge regulating valve (8), heating steam extraction regulating valve (10) and carbon capture steam extraction regulating valve (13) are respectively connected to the operation mode controller (23) by wires.

[0011] Preferably, the above-mentioned middle-low pressure cylinder communication pipe (6) is installed with middle discharge butterfly valve (24) and middle discharge regulating valve (8).

[0012] Preferably, the initial end of the above-mentioned steam extraction pipeline (7) is connected to the middle-low pressure cylinder communication pipe (6), and the steam extraction pipeline (7) is divided into two routes, one route is sequentially connected to the heating steam extraction check valve (9), heating steam extraction regulating valve (10), heating steam extraction shutoff valve (11) and heat network heater (15), and the other route is sequentially connected to the carbon capture steam extraction check valve (12), carbon capture steam extraction regulating valve (13), carbon capture steam extraction shutoff valve (14) and carbon capture steam extraction cooler (16).

[0013] Preferably, the shell side outlet of the above-mentioned heat network heater (15) is connected to the heating steam extraction pump (20) by a pipeline, and the outlet end of the heating steam extraction pump (20) is connected to a steam extraction pipeline.

[0014] Preferably, the tube side inlet of the above-mentioned heat network heater (15) is connected to a heat network return water pipeline (18), and the tube side outlet of the heat network heater (15) is connected to a heat network water supply pipeline (19).

[0015] Preferably, the shell side outlet of the carbon capture extraction steam cooler (16) is connected to the inlet of the carbon capture extraction steam cooler (16) through a pipeline.

[0016] Preferably, the shell side outlet of the carbon capture extraction steam cooler (16) is connected to the inlet of the carbon capture extraction steam cooler (16) through a pipeline.

[0017] Preferably, the shell side outlet of the carbon capture extraction steam cooler (16) is connected to the inlet of the carbon capture extraction steam cooler (16) through a pipeline.

[0018] Preferably, the shell side outlet of the carbon capture extraction steam cooler (16) is connected to the inlet of the carbon capture extraction steam cooler (16) through a pipeline.

[0019] The utility model discloses the beneficial effect is: (1) the utility model discloses a high accuracy in the middle -low pressure cylinder communication pipe of existing of additional one middle -low pressure cylinder, series arrangement is in the downstream of middle -low pressure cylinder butterfly valve, can further reduce the steam flow of entering low pressure cylinder on the original basis, improves the extraction volume, and the operation is simple, and the usability is strong, (2) adopts the operation mode controller to receive operation demand instruction, and the operation mode controller sends out the signal and controls middle -low pressure cylinder regulating valve, heating extraction regulating valve and carbon capture extraction regulating valve respectively, realizes the synchronous regulation of unit electricity, heat load and carbon capture volume, (3) can realize power generation, heating and carbon capture multiple mode operation, through optimizing different power generation steam flow, heating steam flow and carbon capture steam flow, determines the priority operation mode, under the premise of satisfying unit heating or decarburization demand, makes the power plant obtain the maximum economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the heating extraction system schematic drawing of the utility model;

[0021] Figure 2 It is the system structure schematic drawing of the utility model;

[0022] Figure 3 It is the system structure schematic drawing of the utility model embodiment 5;

[0023] In the above figure: medium-pressure cylinder 1, low-pressure cylinder 2, generator 3, condenser 4, condensate pump 5, medium-low pressure cylinder communication pipe 6, extraction pipeline 7, medium discharge regulating valve 8, heat supply extraction check valve 9, heat supply extraction regulating valve 10, heat supply extraction shutoff valve 11, carbon capture extraction check valve 12, carbon capture extraction regulating valve 13, carbon capture extraction shutoff valve 14, heat network heater 15, carbon capture extraction cooler 16, carbon capture device reboiler 17, heat network return water pipeline 18, heat network water supply pipeline 19, heat supply drain pump 20, carbon capture drain pump 21, operation demand instruction 22, operation mode controller 23, medium discharge butterfly valve 24. DETAILED DESCRIPTION

[0024] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0025] Embodiment 1, refer to Figure 1 and Figure 2 The utility model refers to a kind of coupled carbon capture device's cut cylinder combined heat and power multiple mode operation system, including medium-pressure cylinder 1, low-pressure cylinder 2, generator 3, condenser 4, condensate pump 5, medium-low pressure cylinder communication pipe 6, wherein, it further includes extraction pipeline 7, medium discharge regulating valve 8, heat supply extraction check valve 9, heat supply extraction regulating valve 10, heat supply extraction shutoff valve 11, carbon capture extraction check valve 12, carbon capture extraction regulating valve 13, carbon capture extraction shutoff valve 14, heat network heater 15, carbon capture extraction cooler 16, carbon capture device reboiler 17, carbon capture drain pump 21, the steam pipe of medium-pressure cylinder 1 is divided into three branches, first branch is that the medium-pressure cylinder 1 of steam turbine is connected with the low-pressure cylinder 2 of steam turbine by medium-low pressure cylinder communication pipe 6, medium-low pressure cylinder communication pipe 6 is provided with the medium discharge regulating valve 8 for adjusting the steam flow and pressure of entering low-pressure cylinder 2;Second branch is that medium-pressure cylinder 1 is connected with heat network heater 15 by extraction pipeline 7, heat supply extraction check valve 9, heat supply extraction regulating valve 10, heat supply extraction shutoff valve 11;Third branch is that medium-pressure cylinder 1 is sequentially connected carbon capture extraction check valve 12, carbon capture extraction regulating valve 13, carbon capture extraction shutoff valve 14 and carbon capture extraction cooler 16 by extraction pipeline 7, and then connected with carbon capture device reboiler 17.

[0026] The above-mentioned medium discharge regulating valve 8, heat supply extraction regulating valve 10 and carbon capture extraction regulating valve 13 are respectively connected to operation mode controller 23 by wire.

[0027] The initial end of the steam extraction pipeline 7 is connected to the intermediate-low pressure cylinder communication pipe 6, the steam extraction pipeline 7 is divided into two routes, one route is sequentially connected to the heat supply steam extraction check valve 9, the heat supply steam extraction regulating valve 10, the heat supply steam extraction shutoff valve 11 and the heat network heater 15, and the other route is sequentially connected to the carbon capture steam extraction check valve 12, the carbon capture steam extraction regulating valve 13, the carbon capture steam extraction shutoff valve 14 and the carbon capture steam extraction cooler 16.

[0028] The shell side outlet of the heat network heater 15 is connected to the heat supply steam trap pump 20 through a pipeline, and the outlet end of the heat supply steam trap pump 20 is connected to the steam trap pipeline.

[0029] The tube side inlet of the heat network heater 15 is connected to the heat network return water pipeline 18, and the tube side outlet of the heat network heater 15 is connected to the heat network water supply pipeline 19.

[0030] The shell side outlet of the carbon capture steam extraction cooler 16 is connected to the inlet end of the capture device reboiler 17 through a pipeline, and the outlet end of the capture device reboiler 17 is connected to the tube side inlet of the carbon capture steam extraction cooler 16 through a pipeline.

[0031] The tube side outlet of the carbon capture steam extraction cooler 16 is connected to the inlet of the carbon capture steam trap pump 21 through a pipeline, and the outlet of the carbon capture steam trap pump 21 is connected to the steam trap pipeline.

[0032] The outside of the low pressure cylinder 2 is provided with the generator 3, and the outside of the low pressure cylinder 2 is connected to the condenser 4 through a pipeline, and the outlet end of the condenser 4 is provided with the condensate pump 5.

[0033] The outlet end of the condensate pump 5 is connected to the steam trap pipeline.

[0034] When the utility model is used,

[0035] Under the normal power generation working condition, the operation mode controller 23 receives the operation demand instruction 22, the intermediate discharge regulating valve 8 is fully opened, the heat supply steam extraction regulating valve 10 and the carbon capture steam extraction regulating valve 13 are closed, and at this time, the exhaust steam of the intermediate pressure cylinder 1 is all introduced into the low pressure cylinder 2 to drive the steam turbine to generate power.

[0036] The utility model discloses a cut cylinder heat and power cogeneration multi-mode operation system of coupling carbon capture device, including medium pressure cylinder 1, low pressure cylinder 2, generator 3, condenser 4, condensate pump 5, medium low pressure cylinder communication pipe 6, wherein, still including steam extraction pipeline 7, middle row regulating valve 8, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction cut -out valve 11, carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction cut -out valve 14, heat network heater 15, carbon capture steam cooler 16, capture device reboiler 17, carbon capture drain pump 21, the exhaust pipe of medium pressure cylinder 1 is divided into three branches, the first branch is that the medium pressure cylinder 1 of steam turbine is connected with the low pressure cylinder 2 of steam turbine through medium low pressure cylinder communication pipe 6, be provided with middle row regulating valve 8 for adjusting the steam flow and pressure of entering low pressure cylinder 2 on medium low pressure cylinder communication pipe 6, the second branch is that medium pressure cylinder 1 is connected with heat network heater 15 through steam extraction pipeline 7, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction cut -out valve 11, the third branch is that medium pressure cylinder 1 is connected carbon capture steam cooler 16, carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction cut -out valve 14 and carbon capture steam extraction regulating valve 13 in proper order through steam extraction pipeline 7, and then with capture device reboiler 17 is connected.

[0037] The difference between embodiment 1 is:

[0038] The medium low pressure cylinder communication pipe 6 mentioned in this embodiment is installed with middle row butterfly valve 24 and middle row regulating valve 8, and the accuracy of middle row regulating valve 8 is higher than that of middle row butterfly valve 24, so that the flow can be controlled more accurately.

[0039] The utility model discloses a cut cylinder heat and power cogeneration multi-mode operation system of coupling carbon capture device, including medium pressure cylinder 1, low pressure cylinder 2, generator 3, condenser 4, condensate pump 5, medium low pressure cylinder communication pipe 6, wherein, still including steam extraction pipeline 7, middle row regulating valve 8, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction cut -out valve 11, carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction cut -out valve 14, heat network heater 15, carbon capture steam cooler 16, capture device reboiler 17, carbon capture drain pump 21, the exhaust pipe of medium pressure cylinder 1 is divided into three branches, the first branch is that the medium pressure cylinder 1 of steam turbine is connected with the low pressure cylinder 2 of steam turbine through medium low pressure cylinder communication pipe 6, be provided with middle row regulating valve 8 for adjusting the steam flow and pressure of entering low pressure cylinder 2 on medium low pressure cylinder communication pipe 6, the second branch is that medium pressure cylinder 1 is connected with heat network heater 15 through steam extraction pipeline 7, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction cut -out valve 11, the third branch is that medium pressure cylinder 1 is connected carbon capture steam cooler 16, carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction cut -out valve 14 and carbon capture steam extraction regulating valve 13 in proper order through steam extraction pipeline 7, and then with capture device reboiler 17 is connected.

[0040] The difference from Example 2 is that:

[0041] In the cut-cylinder working condition, first, the opening of the middle exhaust regulating valve 8 is adjusted to decrease to the minimum value in the non-cut-cylinder working condition, only a small amount of steam is allowed to enter the low-pressure cylinder 2 to cool the rotor at the minimum closing limit, and the steam extraction amount can be further increased by adjusting the opening of the middle exhaust regulating valve 8; in the heating season, the heating steam extraction regulating valve 10 controls the opening according to the instruction of the operation mode controller 23 to meet the heat load demand, and the opening of the middle exhaust regulating valve 8 is reduced.

[0042] In Example 4, the utility model relates to a cut-cylinder combined heat and power multi-mode operation system of a carbon capture device, which comprises a middle-pressure cylinder 1, a low-pressure cylinder 2, a generator 3, a condenser 4, a condensate pump 5, a middle-low-pressure cylinder communication pipe 6, wherein it further comprises a steam extraction pipeline 7, a middle exhaust regulating valve 8, a heating steam extraction check valve 9, a heating steam extraction regulating valve 10, a heating steam extraction shutoff valve 11, a carbon capture steam extraction check valve 12, a carbon capture steam extraction regulating valve 13, a carbon capture steam extraction shutoff valve 14, a heat network heater 15, a carbon capture steam cooler 16, a capture device reboiler 17, and a carbon capture drainage pump 21; the steam pipe of the middle-pressure cylinder 1 is divided into three branches; the first branch is that the middle-pressure cylinder 1 of the steam turbine is connected with the low-pressure cylinder 2 of the steam turbine through the middle-low-pressure cylinder communication pipe 6, and the middle-low-pressure cylinder communication pipe 6 is provided with the middle exhaust regulating valve 8 for adjusting the steam flow and pressure entering the low-pressure cylinder 2; the second branch is that the middle-pressure cylinder 1 is connected with the heat network heater 15 through the steam extraction pipeline 7, the heating steam extraction check valve 9, the heating steam extraction regulating valve 10 and the heating steam extraction shutoff valve 11; and the third branch is that the middle-pressure cylinder 1 is connected with the carbon capture steam cooler 16 through the steam extraction pipeline 7 in sequence, the carbon capture steam extraction check valve 12, the carbon capture steam extraction regulating valve 13, the carbon capture steam extraction shutoff valve 14 and the carbon capture steam cooler 16, and then connected with the capture device reboiler 17.

[0043] The difference from Example 3 is that:

[0044] During carbon capture, the opening of the carbon capture steam extraction regulating valve 13 is adjusted to increase or decrease according to the change of the carbon capture amount by the operation mode controller 23; the utility model receives the operation demand instruction 22 by the operation mode controller 23, controls the middle exhaust regulating valve 8, the heating steam extraction regulating valve 10 and the carbon capture steam extraction regulating valve 13 respectively, and realizes the synchronous adjustment of the unit electric load, heat load and carbon capture amount.

[0045] The utility model provides a cut cylinder heat -power cogeneration multimode operation system of coupled carbon capture device, including medium pressure cylinder 1, low pressure cylinder 2, generator 3, condenser 4, condensate pump 5, medium low pressure cylinder communication pipe 6, wherein, still including steam extraction pipeline 7, middle row regulating valve 8, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction shutoff valve 11, carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction shutoff valve 14, heat network heater 15, carbon capture steam extraction cooler 16, capture device reboiler 17, carbon capture trap 21, the steam pipe of medium pressure cylinder 1 is divided into three branches, the first branch is that the medium pressure cylinder 1 of steam turbine is connected with the low pressure cylinder 2 of steam turbine through medium low pressure cylinder communication pipe 6, be provided with middle row regulating valve 8 for adjusting the steam flow and pressure of entering low pressure cylinder 2 on medium low pressure cylinder communication pipe 6, the second branch is that medium pressure cylinder 1 is connected with heat network heater 15 through steam extraction pipeline 7, heating steam extraction check valve 9, heating steam extraction regulating valve 10, heating steam extraction shutoff valve 11, the third branch is that medium pressure cylinder 1 is connected carbon capture steam extraction check valve 12, carbon capture steam extraction regulating valve 13, carbon capture steam extraction shutoff valve 14 and carbon capture steam extraction cooler 16 in proper order through steam extraction pipeline 7, and then is connected with capture device reboiler 17.

[0046] The difference from example 4 is:

[0047] Referring to Figure 3 In order to ensure the stable heating needs in winter in northern areas, two or more heat network heaters 15 are provided, so that the heating is more stable.

[0048] The above is only the preferred embodiment of the utility model, and any skilled person in the art can modify the utility model by using the technical solutions described above or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation according to the technical solutions of the utility model is within the scope of protection required by the utility model.

Claims

1. A coupled carbon capture device's cut cylinder combined heat and power multi-mode operation system, comprising a medium pressure cylinder (1), a low pressure cylinder (2), a generator (3), a condenser (4), a condensate pump (5), a medium-low pressure cylinder communication pipe (6), characterized in that: Also include steam extraction pipeline (7), the middle row regulating valve (8), heat supply extraction check valve (9), heat supply extraction regulating valve (10), heat supply extraction shutoff valve (11), carbon capture extraction check valve (12), carbon capture extraction regulating valve (13), carbon capture extraction shutoff valve (14), heat network heater (15), carbon capture extraction cooler (16), capture device reboiler (17), carbon capture drainage pump (21), the exhaust pipe of the middle pressure cylinder (1) is divided into three branches, the first branch is that the middle pressure cylinder (1) of the steam turbine is connected with the low pressure cylinder (2) of the steam turbine through the middle-low pressure cylinder communication pipe (6), the middle-low pressure cylinder communication pipe (6) is provided with the middle row regulating valve (8) for adjusting the steam flow and pressure entering the low pressure cylinder (2);The second branch is that the middle pressure cylinder (1) is connected with the heat network heater (15) through the steam extraction pipeline (7), the heat supply extraction check valve (9), the heat supply extraction regulating valve (10) and the heat supply extraction shutoff valve (11);The third branch is that the middle pressure cylinder (1) is sequentially connected with the carbon capture extraction check valve (12), the carbon capture extraction regulating valve (13), the carbon capture extraction shutoff valve (14) and the carbon capture extraction cooler (16) through the steam extraction pipeline (7), and then connected with the capture device reboiler (17).

2. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 1, wherein: The middle row regulating valve (8), the heat supply extraction regulating valve (10) and the carbon capture extraction regulating valve (13) are respectively connected to the operation mode controller (23) by wires.

3. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 2, wherein: The middle-low pressure cylinder communication pipe (6) is provided with the middle row regulating valve (8) and the middle row regulating valve (8).

4. The coupled carbon capture device's cut cylinder combined cycle cogeneration multi-mode operation system of claim 3, wherein: The initial end of the steam extraction pipeline (7) is connected to the middle-low pressure cylinder communication pipe (6), and the steam extraction pipeline (7) is divided into two routes, one of which is sequentially connected with the heat supply extraction check valve (9), the heat supply extraction regulating valve (10), the heat supply extraction shutoff valve (11) and the heat network heater (15), and the other of which is sequentially connected with the carbon capture extraction check valve (12), the carbon capture extraction regulating valve (13), the carbon capture extraction shutoff valve (14) and the carbon capture extraction cooler (16).

5. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 4, wherein: The shell side outlet of the heat network heater (15) is connected to the heat supply drainage pump (20) by a pipeline, and the outlet end of the heat supply drainage pump (20) is connected to the drainage pipeline.

6. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 5, wherein: The tube side inlet of the heat network heater (15) is connected to the heat network return water pipeline (18), and the tube side outlet of the heat network heater (15) is connected to the heat network water supply pipeline (19).

7. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 4, wherein: The shell side outlet of the carbon capture extraction cooler (16) is connected to the inlet end of the capture device reboiler (17) by a pipeline, and the outlet end of the capture device reboiler (17) is connected to the tube side inlet of the carbon capture extraction cooler (16) by a pipeline.

8. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 7, wherein: The tube side outlet of the carbon capture extraction cooler (16) is connected to the inlet of the carbon capture drainage pump (21) by a pipeline, and the outlet of the carbon capture drainage pump (21) is connected to the drainage pipeline.

9. The coupled carbon capture device's cycled cylinder combined heat and power, multi-mode operating system of claim 1, wherein: The low pressure cylinder (2) is provided with a generator (3) outside, and the low pressure cylinder (2) is connected to the condenser (4) by a pipeline outside, and the condenser (4) is provided with a condensate pump (5) on the pipeline of the outlet end.

10. The coupled carbon capture device's cut cylinder combined heat and power polygeneration system of claim 9, wherein: The outlet end of the condensate pump (5) is connected to the drainage pipeline.

Images