Combustion and waste heat utilization combined system for offshore platform torch vent gas

Abstract

The invention discloses a combustion and waste heat utilization combined system for offshore platform torch vent air. Comprising an SOFC (Solid Oxide Fuel Cell) power generation system, an SOFC power generation subsystem and a steam generation system, wherein the SOFC power generation system takes torch vent gas as a cell stack fuel; the SOFC power generation subsystem is driven by high-temperature and high-pressure flue gas; the steam generation system provides a driving heat source for a second-class absorption heat pump system; the second-class absorption heat pump system uses high-temperature steam produced by the steam generation system as a driving heat source and produces cold energy for a cold user, and the steam utilization system is used for utilizing steam obtained after heat exchange of the second-class absorption heat pump system. And the steam utilization system and the water supply and return system provide a water source for the second-class absorption heat pump system. According to the invention, a large amount of torch vent gas which is wasted originally is fully utilized, carbon emission is effectively reduced, and the economic benefit of an offshore platform is improved.

Description

Technical Field

[0001] The invention belongs to the field of thermal equipment and thermal management systems, and in particular relates to a combined system for combustion and waste heat utilization of flare air from an offshore platform. Background Art

[0002] Flare air mainly comes from low-pressure gas, flash gas and cover gas generated during the production process of offshore oil production facilities due to the limitations of production and processing equipment. The main components of flare air are alkanes below 3C, as well as a small amount of H2S, CO2, N2 and other gases. At present, only a small amount of the large amount of flare air produced by offshore platforms is collected, stored and utilized, and a large part of the rest is burned into the air or discharged into the atmosphere. This has caused great energy waste and carbon emissions.

[0003] Solid oxide fuel cell (SOFC) is a new type of high-temperature fuel cell with high efficiency, good fuel adaptability and low pollutant emissions. It has high power generation efficiency (self-generation efficiency is nearly 60%, and the efficiency can be more than 70% when used with gas turbines), high cogeneration efficiency (cogeneration efficiency is more than 90%), water saving (2% of traditional power generation water consumption), green and environmentally friendly, easy modular assembly, wide range of fuel selection (natural gas, coal-to-gas, biomass gas, methanol, etc.), no need for precious metal catalysts, and strong adaptability. SOFC has been well applied in scenarios such as small household cogeneration systems, distributed power generation and transportation (as an auxiliary or power source for vehicles, ships, drones, etc.). As a high-temperature fuel cell, the core operating temperature of SOFC is usually between 700℃ and 800℃, and the temperature of the tail gas of the stack can generally reach more than 750℃, and contains some fuel gas that has not been completely reacted. The flue gas generated after the combustion and utilization of the tail gas of the stack is still high temperature, and a thermal management system needs to be designed to utilize this part of the waste heat to avoid the waste of high-quality waste heat resources. Summary of the invention

[0004] The present invention is proposed to solve the problem of energy waste in the prior art, and its purpose is to provide a combined system for combustion and waste heat utilization of flare bleed air on offshore platforms.

[0005] The present invention is achieved through the following technical solutions:

[0006] A combined system for combustion and waste heat utilization of flare air from offshore platforms, comprising:

[0007] The SOFC power generation system uses the flare air from the offshore platform as fuel for the cell stack, and an electrochemical reaction occurs inside the cell stack to output electrical energy;

[0008] The SOFC power generation subsystem uses the gas produced by the cathode and anode after the battery stack reaction to burn in the afterburner to produce high-temperature and high-pressure flue gas, which drives the blades of the gas turbine to rotate, thereby driving the generator to generate electricity;

[0009] The steam generation system heats the incoming water provided by the water supply and return system into high-temperature steam. The high-temperature steam provides a driving heat source for the second-type absorption heat pump system on one path, and heats the equipment required for production and life after heat exchange in the second-type absorption heat pump system. The high-temperature steam is mixed with the flare exhaust air on the other path and enters the anode of the battery stack to participate in the reaction;

[0010] The second type of absorption heat pump system uses the high-temperature steam produced by the steam generation system as the driving heat source to produce cold for cold users and uses the cooled return water in the condenser;

[0011] A steam utilization system, which reuses the steam after heat exchange of the second type absorption heat pump system;

[0012] The water supply and return system provides water for the steam generation system and the steam utilization system, uses the heat of the high-temperature and high-pressure flue gas generated by the combustion in the afterburner to generate a stable steam flow, provides refrigerant water for circulation to the absorber of the second-type absorption heat pump system, provides water flow to the condenser to absorb the heat released by the refrigerant water, provides cooling water to the evaporator and uses the cooling water return water to provide cooling capacity; and provides hot water for production and living users after heat exchange with the high-temperature steam from the steam generation and utilization systems.

[0013] In the above technical scheme, the SOFC power generation system includes a fuel compressor, an air compressor, an air preheater, a mixer and a battery stack; the flare air of the offshore platform enters the fuel compressor, and the outlet of the fuel compressor is connected to the fuel inlet of the mixer; air enters the air compressor, and the outlet of the air compressor is connected to the air inlet of the air preheater; the air outlet of the air preheater is connected to the cathode of the battery stack; the flue gas inlet of the air preheater is connected to the outlet of the gas turbine, and the flue gas outlet of the air preheater is connected to the heat source inlet of the phase change heat storage heat exchanger; the steam inlet of the mixer is connected to the high-temperature steam outlet of the phase change heat storage heat exchanger, and the outlet of the mixer is connected to the anode of the battery stack; the cathode exhaust gas outlet and the anode exhaust gas outlet of the battery stack are both connected to the inlet of the afterburner chamber.

[0014] In the above technical solution, the SOFC power generation subsystem includes an afterburner, a gas turbine and a generator; the high-temperature flue gas outlet of the afterburner is connected to the inlet of the gas turbine, and the outlet of the gas turbine is connected to the flue gas inlet of the air preheater; the blades of the gas turbine rotate to drive the generator.

[0015] In the above technical solution, the fuel compressor and the air compressor in the SOFC power generation system are coaxially arranged with the gas turbine in the SOFC power generation subsystem.

[0016] In the above technical solution, the steam generation system includes a phase-change heat storage heat exchanger, the heat source inlet of the phase-change heat storage heat exchanger is connected to the flue gas outlet of the air preheater, and the heat source outlet of the phase-change heat storage heat exchanger is vented; the water source inlet of the phase-change heat storage heat exchanger is connected to the supply and return water system; a three-way valve is arranged on the high-temperature steam outlet pipeline of the phase-change heat storage heat exchanger, one path of the high-temperature steam is connected to the steam inlet of the mixer, and the other path is connected to the driving heat source inlet of the generator of the second type absorption heat pump system.

[0017] In the above technical scheme, the second type of absorption heat pump system includes a generator, a solution heat exchanger, an evaporator, a condenser, an absorber and a cold user; the driving heat source inlet of the generator is connected to the high-temperature steam outlet of the phase-change heat storage heat exchanger, and the driving heat source outlet of the generator is connected to the heat source inlets of each steam-water heat exchanger of the heat user through the No. Ⅰ multi-way valve respectively, and the heat source outlets of each steam-water heat exchanger are collected through the No. Ⅱ multi-way valve and enter the steam inlet of the steam condenser; the driving heat source outlet of the generator is directly connected to the steam condenser; the normal temperature water inlet of the evaporator is connected to the water storage tank, and the cold water outlet of the evaporator is simultaneously connected to the condensed water inlet of the steam condenser and the refrigerant inlet of the cold user's exchanger; the steam outlet of the evaporator is connected to the steam inlet of the absorber; the steam inlet of the evaporator is connected to the steam outlet of the condenser; The water inlet of the absorber is connected to the water storage tank, the water outlet of the absorber is connected to the condensed water inlet of the condenser, the steam outlet of the absorber is connected to the low-temperature steam inlet of the solution heat exchanger through the solution pump, and the steam inlet of the absorber is respectively connected to the steam outlet of the evaporator and the high-temperature steam outlet of the solution heat exchanger; the low-temperature steam inlet of the solution heat exchanger is connected to the steam outlet of the absorber, the low-temperature steam outlet of the solution heat exchanger is connected to the steam inlet of the generator, the high-temperature steam inlet of the solution heat exchanger is connected to the steam outlet of the generator, and the high-temperature steam outlet of the solution heat exchanger is connected to the steam inlet of the absorber through the pressure reducing valve; the condensed water inlet of the condenser is connected to the water outlet of the absorber, the condensed water outlet of the condenser is connected to the water storage tank, the steam inlet of the condenser is connected to the steam outlet of the generator, and the steam outlet of the condenser is connected to the steam inlet of the evaporator through the throttle valve.

[0018] In the above technical solution, a check valve is provided on each branch line of the heat user; and a discharge valve is provided on the pipeline between the generator and the steam condenser.

[0019] In the above technical scheme, the steam utilization system includes various steam-water heat exchangers and steam condensers of heat users; the heat users include domestic heat users and production heat users; the condensate inlet of the steam condenser is connected to the cold water outlet of the evaporator in the second type absorption heat pump system and the refrigerant outlet of the exchanger of the cold user; the condensate outlet of the steam condenser is connected to a water storage tank; the steam inlet of the steam condenser is connected to the heat source outlet of each steam-water heat exchanger of the heat users; and the return water outlet of the steam condenser is connected to the water storage tank.

[0020] In the above technical solution, the water supply and return system includes a water storage tank and a water pump arranged on the outlet pipeline of the water storage tank; the water in the water storage tank is divided into three routes, the first route is connected to the water source inlet of the phase change heat storage heat exchanger; the second route is connected to the second type of absorption heat pump system; the third route is connected to the steam utilization system, is heated by the steam-water heat exchanger of the steam utilization system, and is returned to the heat user for use.

[0021] In the above technical solution, a sewage treatment device is arranged on the return water pipeline of the domestic heat user of the heat user.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a combined system for combustion and waste heat utilization of flare vent air on offshore platforms, which fully utilizes a large amount of flare vent air that was originally discarded as energy, avoids pollution emissions caused by flare gas burning in the air, and has great benefits for energy conservation and emission reduction; uses a phase-change heat storage heat exchanger to solve the problem of flare gas flow fluctuation and generate a stable and qualified steam flow for use; realizes the cascade utilization of energy, and fully utilizes heat or cold in the system, making the entire system efficient and reliable, and achieving higher thermal power efficiency and comprehensive benefits as much as possible; takes measures according to local conditions, fully utilizes the platform's equipment and allocates needs according to hot and cold uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] in:

[0026] 1. Fuel compressor; 2. Air compressor; 3. Air preheater; 4. Mixer; 5. Battery stack; 6. Afterburner; 7. Gas turbine; 8. Generator; 9. Phase change heat storage heat exchanger; 10. Generator; 11. Solution heat exchanger; 12. Solution pump 13. Pressure reducing valve; 14. Throttle valve; 15. Evaporator; 16. Condenser; 17. Absorber; 18. Cold user; 19. Hot user; 20. Sewage treatment device; 21. Steam condenser; 22. Water storage tank; 23. Water pump; 24. Multi-way valve No. Ⅰ; 25. Multi-way valve No. Ⅱ; 26. Discharge valve; 27. Three-way valve; 28. Steam-water heat exchanger.

[0027] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0029] like Figure 1 As shown, a combined system for combustion and waste heat utilization of flare air from an offshore platform includes:

[0030] The SOFC power generation system uses the flare bleed air from the offshore platform as fuel for the cell stack 5, and generates an electrochemical reaction inside the cell stack 5 to output electrical energy;

[0031] The SOFC power generation subsystem utilizes the gas generated by the cathode and anode after the reaction of the battery stack 5 to burn in the afterburner 6 to generate high-temperature and high-pressure flue gas, which drives the blades of the gas turbine 7 to rotate, thereby driving the generator 8 to generate electricity;

[0032] The steam generation system heats the inlet water provided by the water supply and return system into high-temperature steam. The high-temperature steam provides a driving heat source for the second-type absorption heat pump system on one path, and heats the devices required for production and life after heat exchange in the second-type absorption heat pump system. The high-temperature steam is mixed with the flare vent air on the other path and enters the anode of the battery stack 5 to participate in the reaction;

[0033] The second type of absorption heat pump system uses the high temperature steam produced by the steam generation system as the driving heat source to produce cold for cold users and utilizes the cooled return water in the condenser 16;

[0034] A steam utilization system, which reuses the steam after heat exchange of the second type absorption heat pump system;

[0035] The water supply and return system provides water for the steam generation system and the steam utilization system, utilizes the heat of the high-temperature and high-pressure flue gas generated by the combustion in the afterburner 6 to generate a stable steam flow, provides refrigerant water for circulation to the absorber 17 of the second type absorption heat pump system, provides water flow to the condenser 16 to absorb the heat released by the refrigerant water, provides cooling water to the evaporator 15 and uses the cooling water return water to provide cooling capacity; and provides hot water for production and living users after heat exchange with the high-temperature steam from the steam generation and utilization system.

[0036] The SOFC power generation system includes a fuel compressor 1, an air compressor 2, an air preheater 3, a mixer 4 and a battery stack 5; the flare air of the offshore platform enters the fuel compressor 1, and the outlet of the fuel compressor 1 is connected to the fuel inlet of the mixer 4; the air enters the air compressor 2, and the outlet of the air compressor 2 is connected to the air inlet of the air preheater 3; the air outlet of the air preheater 3 is connected to the cathode of the battery stack 5; the flue gas inlet of the air preheater 3 is connected to the outlet of the gas turbine 7, and the flue gas outlet of the air preheater 3 is connected to the heat source inlet of the phase change heat storage heat exchanger 9; the mixer The steam inlet of the combiner 4 is connected to the high-temperature steam outlet of the phase-change heat storage heat exchanger 9, and the outlet of the mixer 4 is connected to the anode of the battery stack 5; the cathode exhaust gas outlet and the anode exhaust gas outlet of the battery stack 5 are both connected to the inlet of the afterburner chamber 6; the components entering the cathode and anode of the battery stack 5 undergo chemical reactions in the battery stack 5 to output electrical energy; the anode of the battery stack 5 is fed with a mixed fluid of compressed flare bleed air and high-temperature steam produced in the mixer 4; the cathode of the battery stack 5 is fed with air compressed by the air compressor 2 and preheated in the air preheater 3 by the high-temperature flue gas from the gas turbine 7.

[0037] The SOFC power generation subsystem includes an afterburner 6, a gas turbine 7 and a generator 8; the high-temperature flue gas outlet of the afterburner 6 is connected to the inlet of the gas turbine 7, and the outlet of the gas turbine 7 is connected to the flue gas inlet of the air preheater 3; the blades of the gas turbine 7 rotate to drive the generator 8; the exhaust gas generated by the cathode and anode of the battery stack 5 enters the afterburner 6 for secondary combustion to generate high-temperature flue gas, and the high-temperature flue gas drives the blades of the gas turbine 7 to rotate and drives the generator 8.

[0038] The fuel compressor 1 and the air compressor 2 in the SOFC power generation system are coaxially arranged with the gas turbine 7 in the SOFC power generation subsystem, and the gas turbine 7 provides driving power for the fuel compressor 1 and the air compressor 2, and the gas turbine 7 also drives the generator 8 to generate secondary electricity.

[0039] The steam generation system includes a phase-change heat storage heat exchanger 9, the heat source inlet of the phase-change heat storage heat exchanger 9 is connected to the flue gas outlet of the air preheater 3, and the heat source outlet of the phase-change heat storage heat exchanger 9 is vented; the water source inlet of the phase-change heat storage heat exchanger 9 is connected to the water supply and return system; a three-way valve is arranged on the high-temperature steam outlet pipeline of the phase-change heat storage heat exchanger 9, one way of the high-temperature steam is connected to the steam inlet of the mixer 4, and the other way is connected to the driving heat source inlet of the generator 10 of the second type absorption heat pump system;

[0040] When the high-temperature flue gas discharged from the flue gas outlet of the heating source air preheater is sufficient, that is, the flare air flow rate is stable, the phase change heat storage heat exchanger 9 uses the phase change heat storage material inside the device to store the heat of the flue gas after combustion. When the high-temperature flue gas discharged from the flue gas outlet of the heating source air preheater is insufficient, that is, the flare air flow rate is unstable, the heat in the heat storage material is released as a supplementary heating source to ensure that a stable steam flow is produced when the flare air flow rate is unstable to meet the needs of production and life. The heating source of the phase change heat storage heat exchanger is the high-temperature flue gas after the air preheater, and the heated source is the water source from the water storage tank 22 of the supply and return water system. The water is heated to a high-temperature steam flow in the phase change heat storage heat exchanger 9.

[0041] The second type absorption heat pump system comprises a generator 10, a solution heat exchanger 11, a solution pump 12, a pressure reducing valve 13, a throttle valve 14, an evaporator 15, a condenser 16, an absorber 17 and a cold user 18;

[0042] The driving heat source inlet of the generator 10 is connected to the high-temperature steam outlet of the phase-change heat storage heat exchanger 9. The driving heat source outlet of the generator 10 is connected to the heat source inlets of each steam-water heat exchanger 28 of the heat user 19 through the No. Ⅰ multi-way valve 24. The heat source outlets of each steam-water heat exchanger 28 are collected through the No. Ⅱ multi-way valve 25 and enter the steam inlet of the steam condenser 21; check valves are arranged on each branch road of the heat user 19 to ensure the steam volume; the driving heat source outlet of the generator 10 is directly connected to the steam condenser 21, and a discharge valve 26 is arranged on the pipeline between the generator 10 and the steam condenser 21. When the steam flow after the generator is not used, it can also directly enter the steam condenser for condensation through the bypass loop;

[0043] The normal temperature water inlet of the evaporator 15 is connected to the water storage tank 22, and the cold water outlet of the evaporator 15 is connected to the condensed water inlet of the steam condenser 21 and the refrigerant inlet of the exchanger of the cold user 18; the steam outlet of the evaporator 15 is connected to the steam inlet of the absorber 17; the steam inlet of the evaporator 15 is connected to the steam outlet of the condenser;

[0044] The water inlet of the absorber 17 is connected to the water storage tank 22, the water outlet of the absorber 17 is connected to the condensed water inlet of the condenser 16, the steam outlet of the absorber 17 is connected to the low-temperature steam inlet of the solution heat exchanger 12 through the solution pump 12, and the steam inlet of the absorber 17 is connected to the steam outlet of the evaporator 15 and the high-temperature steam outlet of the solution heat exchanger 12 respectively;

[0045] The low-temperature steam inlet of the solution heat exchanger 11 is connected to the steam outlet of the absorber 17, the low-temperature steam outlet of the solution heat exchanger 11 is connected to the steam inlet of the generator 10, the high-temperature steam inlet of the solution heat exchanger 11 is connected to the steam outlet of the generator 10, and the high-temperature steam outlet of the solution heat exchanger 11 is connected to the steam inlet of the absorber 17 through the pressure reducing valve 13;

[0046] The condensate inlet of the condenser 16 is connected to the water outlet of the absorber 17, the condensate outlet of the condenser 16 is connected to the water storage tank 22, the steam inlet of the condenser 16 is connected to the steam outlet of the generator 10, and the steam outlet of the condenser 16 is connected to the steam inlet of the evaporator 15 through the throttle valve 14;

[0047] The driving heat source of the second type of absorption heat pump system comes from the high-temperature steam generated by the phase change heat storage heat exchanger 9; the high-temperature steam flows through the generator 10 as a driving heat source and then enters the steam utilization system; the cooling water medium from the water storage tank 22 of the supply and return water system flows through the generator 10 and the condenser 16 and then enters the loop, specifically: the water supplied to the absorption heat pump evaporator 15 for cooling is converted into cold water after passing through the evaporator 15, and the cold water can be used by the cold user 18, and the cold water enters the steam condenser 21 to cool the steam flow and then returns to water; the water supplied to the absorber 17 is used as a refrigerant supplement, enters the condenser 16 to absorb heat and then returns to water.

[0048] The steam utilization system includes various steam-water heat exchangers 28 and steam condensers 21 of heat users 19; the heat users 19 include domestic heat users and production heat users; production heat users include cabin heating, ballast water treatment, etc.; domestic heat users include bathrooms, kitchens, etc.; the condensate inlet of the steam condenser 21 is connected to the cold water outlet of the evaporator 15 in the second type absorption heat pump system and the refrigerant outlet of the exchanger of the cold user 18; the condensate outlet of the steam condenser 21 is connected to the water storage tank 22; the steam inlet of the steam condenser 21 is connected to the heat source outlet of each steam-water heat exchanger 28 of the heat user 19; the return water outlet of the steam condenser 21 is connected to the water storage tank 22;

[0049] The high-temperature steam from the phase-change heat storage heat exchanger 9 can be diverted into the various steam-water heat exchangers 28 of the heat user 19 to heat the water from the supply and return water system as appropriate, and the heated water is supplied to living and production water; the steam after heat exchange is collected and enters the steam condenser SC, and the steam after heat exchange is cooled by cold water from the second type of absorption heat pump in the steam condenser 21, and the cooled steam is converted into return water and returned to the water storage tank 22.

[0050] The water supply and return system includes a water tank 22 and a water pump 23 arranged on the outlet pipeline of the water tank 22; the water in the water tank 22 is divided into three routes, the first route is connected to the water source inlet of the phase change heat storage heat exchanger 9, and is supplied to the phase change heat storage heat exchanger 9 to generate high-temperature steam; the second route is connected to the second type absorption heat pump system, serving as cooling water and refrigerant water for the second type absorption heat pump system, and is returned to the water tank 22 after heat exchange; the third route is supplied to the steam utilization system, is heated by the steam-water heat exchanger 28 of the steam utilization system, and is returned to the heat user 19 after use, and a sewage treatment device 20 is arranged on the return water pipeline of the domestic heat user.

[0051] Principle of the present invention:

[0052] The SOFC power generation system uses the flare air from the offshore platform as fuel to output electrical energy. The phase change heat storage and heat exchange device solves the problem of unstable flare gas flow and generates high-temperature steam. The high-temperature steam can be used as a driving heat source for an absorption heat pump to generate cooling, and can also provide heat for heat users on the offshore platform.

[0053] The present invention manages the system thermally by optimizing the process, making full use of the waste heat of the flare gas combustion products after SOFC power generation, effectively improving the overall thermal power efficiency; by adjusting the layout and optimizing the process, the water consumption of the system is reduced, and the operating cost is reduced. The system of the present invention makes full use of the large amount of flare venting air that was originally wasted, effectively reducing carbon emissions and improving the economic benefits of the offshore platform.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0056] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A combined system for combustion and waste heat utilization of flare air from offshore platforms, characterized in that: A SOFC power generation system, which uses the flare bleed air from an offshore platform as fuel for a cell stack (5), and an electrochemical reaction occurs inside the cell stack (5) to output electrical energy; The SOFC power generation subsystem utilizes the gas generated by the cathode and anode after the reaction of the battery stack (5) to burn in the afterburner (6) to generate high-temperature and high-pressure flue gas, which drives the blades of the gas turbine (7) to rotate, thereby driving the generator (8); A steam generation system heats the incoming water provided by the water supply and return system into high-temperature steam. The high-temperature steam provides a driving heat source for the second-type absorption heat pump system on one path, and provides heat for the devices required for production and life after heat exchange in the second-type absorption heat pump system. The high-temperature steam is mixed with the flare exhaust air on the other path and enters the anode of the battery stack (5) to participate in the reaction. The second type of absorption heat pump system uses the high-temperature steam produced by the steam generation system as the driving heat source to produce cold for cold users; A steam utilization system, which utilizes the steam after heat exchange of the second type absorption heat pump system; The water supply and return system provides water for the steam generation system, steam utilization system and the second type absorption heat pump system.

2. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The SOFC power generation system comprises a fuel compressor (1), an air compressor (2), an air preheater (3), a mixer (4) and a battery stack (5); the flare air of the offshore platform enters the fuel compressor (1), and the outlet of the fuel compressor (1) is connected to the fuel inlet of the mixer (4); the air enters the air compressor (2), and the outlet of the air compressor (2) is connected to the air inlet of the air preheater (3); the air outlet of the air preheater (3) is connected to the cathode of the battery stack (5); the flue gas inlet of the air preheater (3) is connected to the outlet of the gas turbine (7), and the flue gas outlet of the air preheater (3) is connected to the heat source inlet of the phase change heat storage heat exchanger (9); the steam inlet of the mixer (4) is connected to the high-temperature steam outlet of the phase change heat storage heat exchanger (9), and the outlet of the mixer (4) is connected to the anode of the battery stack (5); the cathode tail gas outlet and the anode tail gas outlet of the battery stack (5) are both connected to the inlet of the afterburner (6).

3. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The SOFC power generation subsystem comprises an afterburner (6), a gas turbine (7) and a generator (8); the high-temperature flue gas outlet of the afterburner (6) is connected to the inlet of the gas turbine (7), and the outlet of the gas turbine (7) is connected to the flue gas inlet of the air preheater (3); the blades of the gas turbine (7) rotate to drive the generator (8).

4. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The fuel compressor (1) and the air compressor (2) in the SOFC power generation system are coaxially arranged with the gas turbine (7) in the SOFC power generation subsystem.

5. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1 is characterized in that: The steam generation system comprises a phase-change heat storage heat exchanger (9), the heat source inlet of the phase-change heat storage heat exchanger (9) is connected to the smoke outlet of the air preheater (3), and the heat source outlet of the phase-change heat storage heat exchanger (9) is vented; the water source inlet of the phase-change heat storage heat exchanger (9) is connected to the water supply and return system; a three-way valve is arranged on the high-temperature steam outlet pipeline of the phase-change heat storage heat exchanger (9), one way of the high-temperature steam is connected to the steam inlet of the mixer (4), and the other way is connected to the driving heat source inlet of the generator (10) of the second type absorption heat pump system.

6. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The second type absorption heat pump system comprises a generator (10), a solution heat exchanger (11), an evaporator (15), a condenser (16), an absorber (17) and a cold user (18); The driving heat source inlet of the generator (10) is connected to the high-temperature steam outlet of the phase-change heat storage heat exchanger (9); one way of the driving heat source outlet of the generator (10) is respectively connected to the heat source inlets of the steam-water heat exchangers (28) of the heat user (19) through the No. I multi-way valve (24); the heat source outlets of the steam-water heat exchangers (28) are collected through the No. II multi-way valve (25) and then enter the steam inlet of the steam condenser (21); the other way of the driving heat source outlet of the generator (10) is directly connected to the steam condenser (21); The normal temperature water inlet of the evaporator (15) is connected to the water storage tank (22), and the cold water outlet of the evaporator (15) is simultaneously connected to the condensed water inlet of the steam condenser (21) and the refrigerant inlet of the exchanger of the cold user (18); the steam outlet of the evaporator (15) is connected to the steam inlet of the absorber (17); the steam inlet of the evaporator (15) is connected to the steam outlet of the condenser; The water inlet of the absorber (17) is connected to the water storage tank (22), the water outlet of the absorber (17) is connected to the condensed water inlet of the condenser (16), the steam outlet of the absorber (17) is connected to the low-temperature steam inlet of the solution heat exchanger (12) through the solution pump (12), and the steam inlet of the absorber (17) is respectively connected to the steam outlet of the evaporator (15) and the high-temperature steam outlet of the solution heat exchanger (12); The low-temperature steam inlet of the solution heat exchanger (11) is connected to the steam outlet of the absorber (17), the low-temperature steam outlet of the solution heat exchanger (11) is connected to the steam inlet of the generator (10), the high-temperature steam inlet of the solution heat exchanger (11) is connected to the steam outlet of the generator (10), and the high-temperature steam outlet of the solution heat exchanger (11) is connected to the steam inlet of the absorber (17) through the pressure reducing valve (13); The condensate inlet of the condenser (16) is connected to the water outlet of the absorber (17), the condensate outlet of the condenser (16) is connected to the water storage tank (22), the steam inlet of the condenser (16) is connected to the steam outlet of the generator (10), and the steam outlet of the condenser (16) is connected to the steam inlet of the evaporator (15) through the throttle valve (14).

7. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 6, characterized in that: A check valve is provided on each branch line of the heat user (19); and a discharge valve (26) is provided on the pipeline between the generator (10) and the steam condenser (21).

8. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The steam utilization system comprises various steam-water heat exchangers (28) and a steam condenser (21) of the heat users (19); the heat users (19) comprise domestic heat users and production heat users; the condensate inlet of the steam condenser (21) is connected to the cold water outlet of the evaporator (15) in the second type absorption heat pump system and the refrigerant outlet of the exchanger of the cold user (18); the condensate outlet of the steam condenser (21) is connected to a water storage tank (22); the steam inlet of the steam condenser (21) is connected to the heat source outlet of each steam-water heat exchanger (28) of the heat user (19); and the return water outlet of the steam condenser (21) is connected to the water storage tank (22).

9. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 1, characterized in that: The water supply and return system comprises a water storage tank (22) and a water pump (23) arranged on the outlet pipeline of the water storage tank (22); the water in the water storage tank (22) has three routes, the first route is connected to the water source inlet of the phase change heat storage heat exchanger (9); the second route is connected to the second type absorption heat pump system; the third route is connected to the steam utilization system, is heated by the steam water heat exchanger (28) of the steam utilization system, and is supplied to the heat user (19) for use before being returned.

10. The combined system for combustion and waste heat utilization of flare air from offshore platforms according to claim 9, characterized in that: A sewage treatment device (20) is provided on the return water pipeline of the domestic heat user (19).

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