CN217903155U - Combined cycle combined cooling heating and power system integrating fuel cell and solar energy - Google Patents

Abstract

The utility model relates to a combined cycle combined cooling, heating and power supply system integrating fuel cells and solar energy, which belongs to the technical field of combined cooling, heating and power supply. The cogeneration system includes: a solid oxide fuel cell subsystem; a solar thermal complementary gas-steam combined cycle subsystem, including a gas turbine subsystem and a steam cycle subsystem; and a double-effect absorption lithium bromide refrigeration subsystem. The gas turbine subsystem is respectively connected with the solid oxide fuel cell subsystem and the steam cycle subsystem; the steam cycle subsystem is also connected with the double-effect absorption lithium bromide refrigeration subsystem. The solid oxide fuel cell subsystem can generate power and supplementary combustion, the solar thermal complementary gas-steam combined cycle subsystem can generate electricity and provide heat load to the user side, and the double-effect absorption lithium bromide refrigeration subsystem can provide cooling load to the user side, Reduce the energy loss of the system and improve the working ability of the system while meeting the various energy demands of users for cooling, heating and electricity.

Description

A combined cycle combined cooling, heating and power system integrating fuel cells and solar energy

technical field

The utility model relates to the technical field of solid oxide fuel cells and cogeneration of cooling, heating and power, in particular to a combined cycle cogeneration of cooling, heating and power system integrating fuel cells and solar energy.

Background technique

In recent years, in order to solve the economic development problems caused by energy shortage and environmental pollution, it is necessary to seek a more efficient system coupling method, to improve the system's working ability, reduce the system's energy loss, and introduce renewable energy at the same time. Reasonable construction Multi-energy complementary distributed energy system. For a long time, the use of fossil energy has occupied a major part of the world's energy utilization structure. However, with the excessive consumption of fossil energy and the increasingly prominent environmental pollution and other problems continue to worsen, solar energy, as the renewable energy with the largest reserves, its large-scale and efficient utilization has become an inevitable requirement for adjusting the world's energy utilization structure and sustainable development. Therefore, how to efficiently utilize renewable energy—solar energy, improve the system's working ability, and simultaneously meet the various energy demands of users for cooling, heating, and electricity is a technical problem that needs to be solved urgently in this field.

Utility model content

The purpose of this utility model is to provide a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy, so as to reduce the energy loss of the system and improve the efficiency of the system while meeting the user's various energy requirements for cooling, heating and electricity. Work ability.

In order to achieve the above object, the utility model provides the following scheme:

A combined cycle cooling, heating and power generation system integrating fuel cells and solar energy, including: a solid oxide fuel cell subsystem, a solar thermal complementary gas-steam combined cycle subsystem, and a double-effect absorption lithium bromide refrigeration subsystem; the solar thermal The complementary gas-steam combined cycle subsystem includes a gas turbine subsystem and a steam cycle subsystem; the gas turbine subsystem is connected to the solid oxide fuel cell subsystem and the steam cycle subsystem respectively; the steam cycle subsystem is also connected to the The double-effect absorption lithium bromide refrigeration subsystem is connected;

The solid oxide fuel cell subsystem includes: a gas mixer (101), a gas heat exchanger (102), a fuel cell anode (103), a gas separator (104), an air heat exchanger (105), a fuel cell cathode (106), DC/AC converter (107) and fuel cell afterburner (108); the outlet of the gas mixer (101) is connected to the first inlet of the gas heat exchanger (102); the The first outlet of the gas heat exchanger (102) is connected to the inlet of the fuel cell anode (103); the outlet of the fuel cell anode (103) is connected to the inlet of the gas separator (104); The first outlet of the gas separator (104) is connected to the first inlet of the gas mixer (101), and the second outlet of the gas separator (104) is connected to the afterburner of the fuel cell ( 108) is connected to the first inlet; the first outlet of the air heat exchanger (105) is connected to the inlet of the fuel cell cathode (106); the outlet of the fuel cell cathode (106) is connected to the fuel The second inlet of the battery post-combustion chamber (108) is connected; the outlet of the fuel cell carries out electrical output through the DC/AC converter (107); the outlet of the fuel cell post-combustion chamber (108) is connected to the gas The second road inlet of the heat exchanger (102) is connected; the second road outlet of the gas heat exchanger (102) is connected with the first road inlet of the air heat exchanger (105); the air heat exchanger The second outlet of (105) is connected with the gas turbine subsystem.

Optionally, the fuel cell is a solid oxide fuel cell.

Optionally, the second inlet of the gas mixer (101) feeds methane; the third inlet of the gas mixer (101) feeds carbon dioxide; the second inlet of the air heat exchanger (105) The entrance of the road leads to the air.

Optionally, the gas turbine subsystem includes: a compressor (201), a combustion chamber (202), a gas turbine (203), a first generator (204), and a flue gas mixer (205);

The compressor (201) is connected with the gas turbine (203) through the combustion chamber (202); the compressor (201), the gas turbine (202) and the first generator ( 204) Coaxial connection, through the first generator (204) for electrical output; the second outlet of the air heat exchanger (105) is connected to the first inlet of the flue gas mixer (205) ; The outlet of the gas turbine (203) is connected to the second inlet of the flue gas mixer (205).

Optionally, the inlet of the compressor (201) is fed with air; the inlet of the combustion chamber (202) is fed with methane.

Optionally, the steam cycle subsystem includes: waste heat boiler, steam turbine high pressure cylinder (306), steam turbine medium pressure cylinder (307), steam turbine low pressure cylinder (308), second generator (309), feed water heat exchanger ( 310), condenser (311), low-pressure feedwater pump (312), medium-pressure feedwater pump (313), high-pressure feedwater pump (314), first solar collector (316), first feedwater mixer (317) , the second solar heat collector (318) and the second feedwater mixer (319); the waste heat boiler includes the first heat exchanger group (301), the first stage high-pressure economizer (302), the second Group (303), second-stage high-pressure economizer (304) and third heat exchanger group (305); the first heat exchanger group (301) is composed of low-pressure economizer and low-pressure evaporator; The second heat exchanger group (303) is composed of a medium-pressure economizer, a medium-pressure evaporator, and a low-pressure superheater; the third heat exchanger group (305) is composed of a medium-pressure superheater, a high-pressure evaporator, a reheating device and high pressure superheater;

The outlet of the flue gas mixer (205) is connected to the inlet of the waste heat boiler; the outlet of the high-pressure superheater of the third heat exchanger group (305) is connected to the first inlet of the steam turbine high-pressure cylinder (306) connected; the outlet of the steam turbine high-pressure cylinder (306) is connected with the reheater inlet of the third heat exchanger group (305); the reheater outlet of the third heat exchanger group (305) is connected with the The inlet of the steam turbine medium pressure cylinder (307) is connected; the first outlet of the steam turbine medium pressure cylinder (307) is connected with the inlet of the steam turbine low pressure cylinder (308), the second of the steam turbine medium pressure cylinder (307) The road outlet is connected to the first road inlet of the feed water heat exchanger (310); the second road inlet of the feed water heat exchanger (310) is connected to normal temperature water; the first road inlet of the feed water heat exchanger (310) The outlet of the outlet is connected to the inlet of the low-pressure feed water pump (312); the outlet of the second outlet of the feed water heat exchanger (310) performs heat output; the high-pressure cylinder (306) of the steam turbine, the medium-pressure cylinder (307 ), the steam turbine low-pressure cylinder (308) and the second generator (309) are coaxially connected, and the electrical output is carried out through the second generator (209); the outlet of the steam turbine low-pressure cylinder (308) is connected to the The inlet of the condenser (311) is connected; the outlet of the condenser (311) is connected with the inlet of the low-pressure feed water pump (312); the outlet of the low-pressure feed water pump (312) is connected with the first pump The low-pressure economizer inlet connection of the heater group (301);

The outlet of the low-pressure superheater of the second heat exchanger group (303) is connected to the inlet of the steam turbine low-pressure cylinder (308); the first of the outlets of the low-pressure economizer of the first heat exchanger group (301) The road is connected to the inlet of the high-pressure feed water pump (314); the first road outlet of the high-pressure feed water pump (314) is connected to the first road inlet of the first-stage high-pressure economizer (302); the first road The second path in the outlet of the low-pressure economizer of a heat exchanger group (301) is connected with the inlet of the medium-pressure economizer of the second heat exchanger group (303) through the medium-pressure feed water pump (313);

The second outlet of the high-pressure feed water pump (314) is connected to the inlet of the first solar heat collector (316); the outlet of the first solar heat collector (316) is connected to the first water feed mixer (317) is connected to the first road inlet; the second road outlet of the first stage high-pressure economizer (302) is connected to the second road inlet of the first water feed mixer (317); the first feed water The first way outlet of the mixer (317) is connected with the inlet of the second solar heat collector (318); the outlet of the second solar heat collector (318) is connected with the second water feed mixer (319) The first road inlet connection; the second road outlet of the first feedwater mixer (317) is connected with the second road inlet of the second-stage high-pressure economizer (304); the second-stage high-pressure economizer The second outlet of the device (304) is connected with the second inlet of the second feedwater mixer (319); the outlet of the second feedwater mixer (319) is connected with the third heat exchanger group (305 ) to the high pressure evaporator inlet connection.

Optionally, both the first solar collector (316) and the second solar collector (318) are trough solar collectors.

Optionally, the double-effect absorption lithium bromide refrigeration subsystem includes: a double-effect absorption lithium bromide refrigerator (315);

The first path in the outlet of the low-pressure evaporator of the first heat exchanger group (301) is connected to the first path inlet of the double-effect absorption lithium bromide refrigerator (315); the double-effect absorption lithium bromide refrigerator The first way outlet of (315) is connected with the second way in the low-pressure economizer inlet of described first heat exchanger group (301); the second way inlet of described double-effect absorption lithium bromide refrigerator (315) Connect the chilled water inlet; the second outlet of the double-effect absorption lithium bromide refrigerator (315) performs cold output.

According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:

The utility model provides a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy, comprising: a solid oxide fuel cell subsystem, a solar thermal complementary gas-steam combined cycle subsystem, and a double-effect absorption lithium bromide refrigeration subsystem The solar thermal complementary gas-steam combined cycle subsystem includes a gas turbine subsystem and a steam cycle subsystem; the gas turbine subsystem is connected to the solid oxide fuel cell subsystem and the steam cycle subsystem respectively; the steam The circulation subsystem is also connected with the double-effect absorption lithium bromide refrigeration subsystem. The solid oxide fuel cell subsystem is capable of power generation and supplementary combustion. The fuel cell is used for power generation, and then the high-temperature exhaust gas discharged from the fuel cell is used as supplementary combustion gas, which is mixed with the exhaust gas of the gas turbine subsystem to jointly drive the steam cycle subsystem. work, can effectively utilize the waste heat generated by high-temperature fuel cells, and reduce energy loss in the system; the solar thermal complementary gas-steam combined cycle subsystem can generate electricity and provide heat load to the user side, and the double-effect absorption lithium bromide refrigeration sub-system The system can provide cooling load to the user side, which reduces the energy loss of the system and improves the working ability of the system while meeting the various energy demands of the user for cooling, heating and electricity.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the invention, those skilled in the art can also obtain other drawings according to these drawings without paying creative efforts.

Fig. 1 is a schematic structural diagram of a combined cycle combined cooling, heating and power supply system integrating fuel cells and solar energy of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The purpose of this utility model is to provide a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy, so as to reduce the energy loss of the system and improve the efficiency of the system while meeting the user's various energy requirements for cooling, heating and electricity. Work ability.

In order to make the above purpose, features and advantages of the utility model more obvious and understandable, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of a combined cycle combined cooling, heating and power system integrating fuel cells and solar energy of the present invention, as shown in Fig. Cogeneration system) includes: solid oxide fuel cell subsystem, solar thermal complementary gas-steam combined cycle subsystem, and double-effect absorption lithium bromide refrigeration subsystem, and the subsystems are connected through pipelines and valves. The solar thermal complementary gas-steam combined cycle subsystem includes a gas turbine subsystem and a steam cycle subsystem; the gas turbine subsystem is connected to the solid oxide fuel cell subsystem and the steam cycle subsystem respectively; the steam cycle The subsystem is also connected with the double-effect absorption lithium bromide refrigeration subsystem.

The solid oxide fuel cell subsystem is used for power generation and supplementary combustion, using a solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) for power generation, and then using the high-temperature exhaust gas discharged from the fuel cell as supplementary combustion gas, and the gas turbine sub-system After the system exhaust is mixed in the flue gas mixer 205, it jointly drives the steam cycle subsystem in the solar heat complementary gas-steam combined cycle subsystem to work.

The solar thermal complementary gas-steam combined cycle subsystem is used to generate electricity and provide heat load to the user side. Among them, the gas turbine subsystem in the solar thermal complementary gas-steam combined cycle subsystem is mainly used for power generation, and the exhaust gas of the gas turbine subsystem is used to drive the steam cycle subsystem in the solar thermal complementary gas-steam combined cycle subsystem, which is replaced by solar collectors Part of the heat load of the first-stage high-pressure economizer and the second-stage high-pressure economizer in the waste heat boiler, when the solar radiation intensity reaches a certain level, the solar collector starts to work, and the circulating work mass in the waste heat boiler increases, thereby Increase the power generation capacity of the steam turbine; at the same time, the system extracts steam from the exhaust steam of the steam turbine medium pressure cylinder in the waste heat boiler to heat domestic hot water and output heat load to the user side.

The double-effect absorption lithium bromide refrigeration subsystem is used to provide cooling load to the user side.

Specifically, referring to FIG. 1, the solid oxide fuel cell subsystem includes: a gas mixer 101, a gas heat exchanger 102, a fuel cell anode 103, a gas separator 104, an air heat exchanger 105, a fuel cell cathode 106, DC to AC converter 107 and fuel cell afterburner 108 . In practical applications, the fuel cell is a solid oxide fuel cell.

Wherein, the second inlet of the gas mixer 101 is fed into methane; the third inlet of the gas mixer 101 is fed into carbon dioxide; One inlet is connected; the first outlet of the gas heat exchanger 102 is connected with the inlet of the fuel cell anode 103; the outlet of the fuel cell anode 103 is connected with the inlet of the gas separator 104; the gas The first way outlet of the separator 104 is connected with the first way inlet of the gas mixer 101, and the second way outlet of the gas separator 104 is connected with the first way inlet of the fuel cell afterburner 108; The first outlet of the air heat exchanger 105 is connected to the inlet of the fuel cell cathode 106; the outlet of the fuel cell cathode 106 is connected to the second inlet of the fuel cell afterburner 108; the fuel cell The outlet of the gas heat exchanger 102 is connected to the second path inlet of the gas heat exchanger 102; the second path of the gas heat exchanger 102 is The outlet is connected to the first inlet of the air heat exchanger 105; the second inlet of the air heat exchanger 105 is fed with air; the second outlet of the air heat exchanger 105 is connected to the gas turbine subsystem The flue gas mixer 205 is connected.

The high-temperature fuel cell in the solid oxide fuel cell subsystem has clean and efficient working characteristics, and the power generation efficiency can theoretically reach more than 50%. system integration. In addition, solid oxide fuel cells use solid ceramics as electrolyte, cathode and anode materials, which can avoid problems such as fuel cell electrolyte loss and thermal corrosion, and solid oxide fuel cells have the advantages of high-efficiency power generation, cleanness, and flexible fuel utilization.

The solar thermal complementary gas-steam combined cycle subsystem introduces solar energy into a high-efficiency combined cycle system, thereby improving the photoelectric conversion efficiency of solar energy, saving costs, and reducing fossil energy consumption.

Referring to FIG. 1 , the gas turbine subsystem in the solar thermal complementary gas-steam combined cycle subsystem includes: a compressor 201 , a combustion chamber 202 , a gas turbine 203 , a first generator 204 and a flue gas mixer 205 .

Wherein, the compressor 201 is connected with the gas turbine 203 through the combustion chamber 202; the inlet of the compressor 201 is fed with air; the inlet of the combustion chamber 202 is fed with methane. The compressor 201 , the gas turbine 202 and the first generator 204 are coaxially connected, and the first generator 204 is used to output electricity, that is, to generate electricity. The second outlet of the air heat exchanger 105 is connected to the first inlet of the flue gas mixer 205 ; the outlet of the gas turbine 203 is connected to the second inlet of the flue gas mixer 205 .

The steam cycle subsystem in the solar thermal complementary gas-steam combined cycle subsystem includes: a waste heat boiler (which includes a first heat exchanger group 301, a first-stage high-pressure economizer 302, a second heat exchanger group 303 , second stage high pressure economizer 304, third heat exchanger group 305), steam turbine high pressure cylinder 306, steam turbine medium pressure cylinder 307, steam turbine low pressure cylinder 308, second generator 309, feed water heat exchanger 310, condenser 311 , low-pressure feedwater pump 312 , medium-pressure feedwater pump 313 , high-pressure feedwater pump 314 , first solar collector 316 , first feedwater mixer 317 , second solar collector 318 and second feedwater mixer 319 . The first heat exchanger group 301 is composed of a low-pressure economizer and a low-pressure evaporator; the second heat exchanger group 303 is composed of a medium-pressure economizer, a medium-pressure evaporator, and a low-pressure superheater; the third The heat exchanger group 305 is composed of a medium pressure superheater, a high pressure evaporator, a reheater and a high pressure superheater. In practical applications, the first heat exchanger group 301, the first stage high-pressure economizer 302, the second heat exchanger group 303, the second stage high-pressure economizer 304, and the third heat exchanger group 305 are usually waste heat boilers made of.

Wherein, the outlet of the flue gas mixer (205) is connected to the inlet of the waste heat boiler; water, steam-water mixture or steam flows through the waste heat boiler. The outlet of the high pressure superheater of the third heat exchanger group 305 is connected with the first inlet of the steam turbine high pressure cylinder 306; the outlet of the steam turbine high pressure cylinder 306 is connected with the reheater of the third heat exchanger group 305 Inlet connection; the reheater outlet of the third heat exchanger group 305 is connected to the inlet of the steam turbine medium pressure cylinder 307; the first outlet of the steam turbine medium pressure cylinder 307 is connected to the inlet of the steam turbine low pressure cylinder 308 Connected, the second outlet of the medium pressure cylinder 307 of the steam turbine is connected to the first inlet of the feed water heat exchanger 310; the second inlet of the feed water heat exchanger 310 is connected to normal temperature water; the feed water exchange The first outlet of the heater 310 is connected to the inlet of the low-pressure feed water pump 312 . The second outlet of the feedwater heat exchanger 310 performs heat output, that is, hot water is generated as a heat load. The steam turbine high-pressure cylinder 306, the steam turbine medium-pressure cylinder 307, the steam turbine low-pressure cylinder 308, and the second generator 309 are coaxially connected, and the second generator 209 is used for electrical output; the steam turbine low-pressure cylinder The outlet of 308 is connected to the inlet of the condenser 311; the outlet of the condenser 311 is connected to the inlet of the low-pressure feed water pump 312; the outlet of the low-pressure feed water pump 312 is connected to the first heat exchanger group 301 low pressure economizer inlet connection.

The outlet of the low-pressure superheater of the second heat exchanger group 303 is connected to the inlet of the steam turbine low-pressure cylinder 308; the first path in the outlet of the low-pressure economizer of the first heat exchanger group 301 is connected to the high-pressure feed The inlet of the water pump 314 is connected; the first outlet of the high-pressure feed water pump 314 is connected with the first inlet of the first-stage high-pressure economizer 302; the outlet of the low-pressure economizer of the first heat exchanger group 301 The second path is connected to the inlet of the medium-pressure economizer of the second heat exchanger group 303 through the medium-pressure feed water pump 313 .

The second outlet of the high-pressure feed water pump 314 is connected to the inlet of the first solar heat collector 316; the outlet of the first solar collector 316 is connected to the first inlet of the first water feed mixer 317 connection; the second outlet of the first-stage high-pressure economizer 302 is connected to the second inlet of the first feedwater mixer 317; the first outlet of the first feedwater mixer 317 is connected to the second outlet of the first feedwater mixer 317 The inlet of two solar heat collectors 318 is connected; The outlet of the second solar heat collector 318 is connected with the first road inlet of the second feedwater mixer 319; the second road outlet of the first feedwater mixer 317 It is connected with the second-way inlet of the second-stage high-pressure economizer 304; the second-way outlet of the second-stage high-pressure economizer 304 is connected with the second-way inlet of the second feedwater mixer 319; the The outlet of the second feedwater mixer 319 is connected to the inlet of the high-pressure evaporator of the third heat exchanger group 305 .

The first heat exchanger group 301, the first-stage high-pressure economizer 302, the second heat exchanger group 303, the second-stage high-pressure economizer 304, and the third heat exchanger group 305 are arranged in a certain position, and the flue gas From the outlet of the flue gas mixer 205 , it flows through the first heat exchanger group 301 , the first stage high-pressure economizer 302 and the second heat exchanger group 303 . In Fig. 1, the arrows between the first heat exchanger group 301, the first stage high-pressure economizer 302, the second heat exchanger group 303, the second stage high-pressure economizer 304, and the third heat exchanger group 305 indicate is the direction of the flue gas, the heat exchanger is composed of pipes, the soda and water flow in the pipes, and the flue gas flows through the outer surface of the pipes. The outlet of the steam turbine high-pressure cylinder (306) is connected with the reheater inlet of the third heat exchanger group (305).

Wherein, both the first solar collector 316 and the second solar collector 318 are trough solar collectors.

Referring to FIG. 1 , the double-effect absorption lithium bromide refrigeration subsystem includes: a double-effect absorption lithium bromide refrigerator 315 . Wherein, the first road in the outlet of the low-pressure evaporator of the first heat exchanger group 301 is connected to the first road inlet of the double-effect absorption lithium bromide refrigerator 315; The first road outlet is connected with the second road in the low-pressure economizer inlet of the first heat exchanger group 301; the second road inlet of the double-effect absorption lithium bromide refrigerator 315 is connected with chilled water inlet; The second outlet of the double-effect absorption lithium bromide refrigerator 315 conducts cold output, that is, produces chilled water outlet as a cooling load.

Referring to FIG. 1 , the working process of the integrated fuel cell and solar energy combined cycle combined cooling, heating and power supply system described in the present invention is described as follows.

Methane is fed into the gas mixer 101 of the solid oxide fuel cell subsystem and the combustor 202 of the gas turbine subsystem respectively, and the solid oxide fuel cell undergoes an electrochemical reaction to generate electricity; methane is burned in the combustor 202 of the gas turbine subsystem, The exhaust gas from the combustion chamber 202 drives the gas turbine 203 to generate electricity, and the first generator 204 outputs electricity. The exhaust gas from the solid oxide fuel cell is mixed with the exhaust gas from the gas turbine 203 to drive the steam cycle subsystem in the solar thermal complementary gas-steam combined cycle subsystem. In the steam cycle subsystem, the waste heat boiler is used as the heating surface carrier, and the first and second solar collectors 316 and 318 are used to replace the first-stage high-pressure economizer 302 and the second-stage high-pressure economizer 304 in the waste heat boiler. Part of the heat load, when the solar radiation intensity reaches a certain level, the solar collectors 316, 318 start to work, and the circulating work mass in the waste heat boiler increases, thereby increasing the power generation of the steam turbines 306, 307, 308; at the same time, the combined power supply system Extract steam from the first heat exchanger group (also known as low-pressure steam drum) 301 of the waste heat boiler and the exhaust steam of the medium-pressure cylinder 307 of the steam turbine to drive the double-effect absorption lithium bromide refrigerator 315 to work and heat domestic hot water. Output cooling load (chilled water outlet) and heat load (hot water) to the user side.

Specifically, when the joint supply system works under a certain solar radiation intensity, the feed water at the outlet of the high-pressure feed water pump 314 is divided into two lines, and in one line, the feed water at the outlet of the high-pressure feed water pump 314 enters the first solar collector The heat energy of the sun is absorbed in the device 316. When the temperature of the feed water at the outlet of the first solar collector 316 is the same as that of the outlet feed water of the first stage high-pressure economizer 302, the outlet feed water of the first solar collector 316 is the same as that of the first stage high-pressure economizer. The feed water at the outlet of the tank 302 enters the first feed water mixer 317 for mixing. The feedwater at the outlet of the first feedwater mixer 317 is divided into two lines. In one line, the feedwater at the outlet of the first feedwater mixer 317 enters the second solar heat collector 318 to absorb solar heat energy. When the second solar heat collector When the outlet feedwater temperature of the device 318 is the same as the outlet feedwater temperature of the second-stage high-pressure economizer 304, the outlet feedwater of the second solar collector 318 and the outlet feedwater of the second-stage high-pressure economizer 304 enter the second feedwater mixer 319 After being mixed, it enters the high-pressure evaporator of the third heat exchanger group 305 composed of a medium-pressure superheater, a high-pressure evaporator, a reheater and a high-pressure superheater.

When the solar radiation intensity is insufficient, the cogeneration system maintains a normal working state by burning methane, and the fuel cell, gas turbine 203 and steam turbine (including the high-pressure cylinder 306 of the steam turbine, the medium-pressure cylinder 307 of the steam turbine, and the low-pressure cylinder 308 of the steam turbine) generate electricity normally , while the double-effect absorption lithium bromide refrigerator 315 and the feed water heat exchanger 310 provide cooling loads and heat domestic hot water to the user side.

The utility model discloses a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy. The combined supply system includes a solid oxide fuel cell (SOFC) subsystem and a solar thermal complementary gas-steam combined cycle (ISCC) subsystem. And double-effect absorption lithium bromide refrigeration subsystem. The cogeneration system first uses the high-temperature exhaust gas generated by the solid oxide fuel cell to preheat the air entering the cathode of the fuel cell, and then mixes with the exhaust gas from the gas turbine subsystem and enters the waste heat boiler; the waste heat boiler is used as the waste heat recovery carrier, and the solar energy is used instead Part of the heat load of the first-stage high-pressure economizer and the second-stage high-pressure economizer in the waste heat boiler increases the working capacity of the bottom cycle. In order to fully meet the user's cooling and heating load requirements, the cogeneration system extracts part of the steam from the low-pressure steam drum of the waste heat boiler, and uses this steam to drive the double-effect absorption lithium bromide refrigeration system to work. In addition, the joint supply system extracts part of the steam from the exhaust steam of the medium pressure cylinder, and uses this steam to heat domestic hot water. Therefore, the cogeneration system provided by the utility model can effectively utilize the waste heat generated by the high-temperature fuel cell and reduce the energy loss in the system while meeting the various energy demands of the user for cooling, heating and electricity; and the efficient utilization can Renewable energy - solar energy, to improve the system's ability to work.

A specific example is provided below to illustrate the technical effect of the joint supply system provided by the utility model. In this embodiment, the fuel is natural gas from the West-East Gas Pipeline, and the weather data is selected from a typical day in Lhasa; Table 1 lists the basic data of thermodynamic analysis of the joint supply system.

Table 1 Basic data of thermodynamic analysis of cogeneration system

效率为52.61％。It can be seen from Table 1 that when the cogeneration system operates under a typical daily stable working condition in Lhasa, considering the heat input from solar energy, its energy efficiency reaches 61.9%.

The efficiency is 52.61%.

The utility model discloses a combined cycle combined cooling, heating and power supply system integrating fuel cells and solar energy. Aiming at the current situation of insufficient thermodynamic advantages of traditional cogeneration systems, a method of coupling high-temperature solid oxide fuel cells in the system is proposed. The exhaust temperature of the battery is equivalent to the exhaust temperature of the gas turbine, so mixing the two and leading to the waste heat boiler can ensure the cascade utilization of energy, which not only effectively utilizes the high-temperature waste heat of the solid oxide fuel cell, but also reduces the energy in the system loss. The structure of the cogeneration system is rationally coupled with the trough solar collector, and the solar collector is used to replace part of the heat load of the waste heat boiler, which improves the flue gas utilization rate of the waste heat boiler, increases the power generation of the steam cycle subsystem, and further Improve the working ability of the system. Therefore, compared with the traditional integration method, the joint supply system provided by the utility model has significant thermodynamic advantages.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples are used to illustrate the principle and implementation of the present utility model. The description of the above embodiments is only used to help understand the control method of the present utility model and its core idea; at the same time, for those of ordinary skill in the art, According to the idea of the utility model, there will be changes in the specific implementation and application range. To sum up, the contents of this specification should not be understood as limiting the utility model.

Claims (8)

1. A combined cycle combined cooling, heating and power system integrating a fuel cell and solar energy, comprising: the system comprises a solid oxide fuel cell subsystem, a solar thermal complementary fuel gas and steam combined cycle subsystem and a double-effect absorption type lithium bromide refrigeration subsystem; the solar heat complementation gas and steam combined cycle subsystem comprises a gas turbine subsystem and a steam cycle subsystem; the gas turbine subsystem is respectively connected with the solid oxide fuel cell subsystem and the steam circulation subsystem; the steam circulation subsystem is also connected with the double-effect absorption lithium bromide refrigeration subsystem;

the solid oxide fuel cell subsystem comprises: a gas mixer (101), a gas heat exchanger (102), a fuel cell anode (103), a gas separator (104), an air heat exchanger (105), a fuel cell cathode (106), a direct current-alternating current converter (107) and a fuel cell afterburner (108); the outlet of the gas mixer (101) is connected with the first path of inlet of the gas heat exchanger (102); the first outlet of the gas heat exchanger (102) is connected with the inlet of the fuel cell anode (103); the outlet of the fuel cell anode (103) is connected to the inlet of the gas separator (104); a first outlet of the gas separator (104) is connected with a first inlet of the gas mixer (101), and a second outlet of the gas separator (104) is connected with a first inlet of the fuel cell afterburner (108); the first outlet of the air heat exchanger (105) is connected with the inlet of the fuel cell cathode (106); the outlet of the fuel cell cathode (106) is connected with the second inlet of the fuel cell afterburner (108); the outlet of the fuel cell is electrically output through the DC/AC converter (107); the outlet of the fuel cell afterburner (108) is connected with the second inlet of the gas heat exchanger (102); the second outlet of the gas heat exchanger (102) is connected with the first inlet of the air heat exchanger (105); the second outlet of the air heat exchanger (105) is connected with the gas turbine subsystem.

2. A combined cycle combined heat and power system integrating a fuel cell and solar energy according to claim 1, wherein the fuel cell is a solid oxide fuel cell.

3. The combined cycle combined cooling, heating and power system according to claim 1, wherein the second inlet of the gas mixer (101) is fed with methane; carbon dioxide is introduced into a third inlet of the gas mixer (101); and a second path of inlet of the air heat exchanger (105) is introduced with air.

4. The integrated fuel cell and solar combined cycle combined heat and power system of claim 1, wherein the gas turbine subsystem comprises: a compressor (201), a combustion chamber (202), a gas turbine (203), a first generator (204) and a flue gas mixer (205);

the compressor (201) is connected with the gas turbine (203) through the combustion chamber (202); the compressor (201), the gas turbine (203) and the first generator (204) are coaxially connected, and electric output is carried out through the first generator (204); the second outlet of the air heat exchanger (105) is connected with the first inlet of the flue gas mixer (205); the outlet of the gas turbine (203) is connected with the second path inlet of the flue gas mixer (205).

5. The combined cycle combined cooling, heating and power system integrating a fuel cell and solar energy as claimed in claim 4, wherein an inlet of the compressor (201) is filled with air; methane is introduced into the inlet of the combustion chamber (202).

6. The integrated fuel cell and solar combined cycle combined heat and power system of claim 4, wherein the steam cycle subsystem comprises: the system comprises a waste heat boiler, a high-pressure turbine cylinder (306), a medium-pressure turbine cylinder (307), a low-pressure turbine cylinder (308), a second generator (309), a water feed heat exchanger (310), a condenser (311), a low-pressure water feed pump (312), a medium-pressure water feed pump (313), a high-pressure water feed pump (314), a first solar heat collector (316), a first water feed mixer (317), a second solar heat collector (318) and a second water feed mixer (319); the waste heat boiler comprises a first heat exchanger group (301), a first-stage high-pressure economizer (302), a second heat exchanger group (303), a second-stage high-pressure economizer (304) and a third heat exchanger group (305); the first heat exchanger group (301) consists of a low-pressure economizer and a low-pressure evaporator; the second heat exchanger group (303) consists of a medium-pressure economizer, a medium-pressure evaporator and a low-pressure superheater; the third heat exchanger group (305) consists of a medium-pressure superheater, a high-pressure evaporator, a reheater and a high-pressure superheater;

the outlet of the flue gas mixer (205) is connected with the inlet of the waste heat boiler; the outlet of the high-pressure superheater of the third heat exchanger group (305) is connected with the first path of inlet of the high-pressure turbine cylinder (306); the outlet of the high-pressure turbine cylinder (306) is connected with the inlet of a reheater of the third heat exchanger group (305); the outlet of a reheater of the third heat exchanger group (305) is connected with the inlet of the turbine intermediate pressure cylinder (307); a first path of outlet of the turbine intermediate pressure cylinder (307) is connected with an inlet of the turbine low pressure cylinder (308), and a second path of outlet of the turbine intermediate pressure cylinder (307) is connected with a first path of inlet of the feedwater heat exchanger (310); the second path of inlet of the feed water heat exchanger (310) is connected with normal temperature water; the first path of outlet of the feedwater heat exchanger (310) is connected with the inlet of the low-pressure feedwater pump (312); the second outlet of the feedwater heat exchanger (310) is used for heat output; the turbine high-pressure cylinder (306), the turbine intermediate-pressure cylinder (307), the turbine low-pressure cylinder (308) and the second generator (309) are coaxially connected, and electric output is performed through the second generator (309); the outlet of the turbine low-pressure cylinder (308) is connected with the inlet of the condenser (311); the outlet of the condenser (311) is connected with the inlet of the low-pressure feed water pump (312); the outlet of the low-pressure water feeding pump (312) is connected with the inlet of a low-pressure economizer of the first heat exchanger group (301);

the outlet of the low-pressure superheater of the second heat exchanger group (303) is connected with the inlet of the steam turbine low-pressure cylinder (308); a first path of the outlets of the low-pressure coal economizer of the first heat exchanger group (301) is connected with the inlet of the high-pressure water feeding pump (314); a first path of outlet of the high-pressure feed water pump (314) is connected with a first path of inlet of the first-stage high-pressure economizer (302); a second path in the outlet of the low-pressure economizer of the first heat exchanger group (301) is connected with the inlet of the medium-pressure economizer of the second heat exchanger group (303) through the medium-pressure feed water pump (313);

the second outlet of the high-pressure feed water pump (314) is connected with the inlet of the first solar heat collector (316); the outlet of the first solar heat collector (316) is connected with the first path inlet of the first water feeding mixer (317); a second outlet of the first-stage high-pressure economizer (302) is connected with a second inlet of the first water supply mixer (317); the first outlet of the first water feed mixer (317) is connected with the inlet of the second solar heat collector (318); the outlet of the second solar heat collector (318) is connected with the first path of inlet of the second water feed mixer (319); a second outlet of the first water feed mixer (317) is connected with a second inlet of the second-stage high-pressure economizer (304); a second outlet of the second-stage high-pressure economizer (304) is connected with a second inlet of the second water supply mixer (319); the outlet of the second feed water mixer (319) is connected with the inlet of the high-pressure evaporator of the third heat exchanger group (305).

7. The combined cycle combined cooling heating and power system according to claim 6, wherein the first solar collector (316) and the second solar collector (318) are each trough solar collectors.

8. The integrated fuel cell and solar combined cycle combined heat and power system of claim 6, wherein the dual-effect absorption lithium bromide refrigeration subsystem comprises: a double-effect absorption lithium bromide refrigerator (315);

a first path in the outlet of the low-pressure evaporator of the first heat exchanger group (301) is connected with a first path inlet of the double-effect absorption lithium bromide refrigerator (315); a first path of outlet of the double-effect absorption lithium bromide refrigerator (315) is connected with a second path of inlet of the low-pressure economizer of the first heat exchanger group (301); a second path of inlet of the double-effect absorption lithium bromide refrigerator (315) is connected with chilled water inlet water; and the second outlet of the double-effect absorption lithium bromide refrigerator (315) is used for cold output.

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