CN115000454A - Combined cycle combined cooling heating and power system integrating fuel cell and solar energy - Google Patents

Abstract

The invention relates to a combined cycle combined cooling heating and power system integrating a fuel cell and solar energy, and belongs to the technical field of combined cooling, heating and power. This joint supply system includes: a solid oxide fuel cell subsystem; the solar heat complementation gas and steam combined cycle subsystem comprises 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 circulation subsystem; the steam circulation subsystem is also connected with the double-effect absorption type lithium bromide refrigeration subsystem. The solid oxide fuel cell subsystem can perform power generation and afterburning, the solar thermal complementary fuel gas and steam combined cycle subsystem can perform power generation and provide heat load for a user side, and the double-effect absorption type lithium bromide refrigeration subsystem can provide cold load for the user side, so that the energy loss of the system is reduced under the condition of meeting various energy requirements of the user on cold, heat and electricity, and the working capacity of the system is improved.

Description

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

technical field

The invention relates to the technical field of solid oxide fuel cells and combined cooling, heating and power, in particular to a combined cycle cooling, heating and power supply 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 find a more efficient system coupling method, and strive to improve the working ability of the system, reduce the energy loss of the system, and introduce renewable energy. Multi-energy complementary distributed energy system. For a long time, fossil energy utilization occupies a major part in the world energy utilization structure. However, as the problems of excessive consumption of fossil energy and increasingly prominent environmental pollution 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 the renewable energy—solar energy, improve the functional capability of the system, and at the same time 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.

SUMMARY OF THE INVENTION

The purpose of the present invention 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 performance of the system under the condition of satisfying the user's various energy requirements for cooling, heating and electricity. functional ability.

For achieving the above object, the present invention provides the following scheme:

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 The complementary gas-steam combined cycle subsystem includes 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 cycle subsystem; the steam cycle subsystem is also connected with 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 a cathode (106), a DC-AC converter (107) and a fuel cell after-combustion chamber (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 fuel cell after-combustion chamber ( 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 after-combustion chamber (108) is connected; the outlet of the fuel cell performs electrical output through the DC-AC converter (107); the outlet of the fuel cell after-combustion chamber (108) is connected to the gas The second inlet of the heat exchanger (102) is connected; the second outlet of the gas heat exchanger (102) is connected with the first inlet of the air heat exchanger (105); the air heat exchanger The second outlet of (105) is connected to the gas turbine subsystem.

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

Optionally, the second inlet of the gas mixer (101) is supplied with methane; the third inlet of the gas mixer (101) is supplied with carbon dioxide; the second inlet of the air heat exchanger (105) is supplied with carbon dioxide. The entrance of the road is vented 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) is connected coaxially, and the electrical 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 to the second inlet of the flue gas mixer (205).

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

Optionally, the steam cycle subsystem includes: a waste heat boiler, a steam turbine high pressure cylinder (306), a steam turbine intermediate pressure cylinder (307), a steam turbine low pressure cylinder (308), a second generator (309), a feed water heat exchanger ( 310), condenser (311), low pressure feed pump (312), medium pressure feed pump (313), high pressure feed pump (314), first solar collector (316), first feed water mixer (317) , a second solar heat collector (318), and a second feedwater mixer (319); the waste heat boiler includes a first heat exchanger group (301), a first-stage high-pressure economizer (302), a second heat exchanger 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 heat exchanger group (305) is composed of a medium-pressure superheater, a high-pressure evaporator, a reheater Composed of heater 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 high pressure cylinder (306) of the steam turbine connection; 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 reheater inlet of the third heat exchanger group (305) The inlet of the steam turbine middle pressure cylinder (307) is connected; the first outlet of the steam turbine middle pressure cylinder (307) is connected to the inlet of the steam turbine low pressure cylinder (308), and the second outlet of the steam turbine middle pressure cylinder (307) The road outlet is connected to the first road inlet of the water supply heat exchanger (310); the second road inlet of the water supply heat exchanger (310) is connected to normal temperature water; the first road of the water supply heat exchanger (310) The outlet of the road is connected to the inlet of the low pressure feed water pump (312); the second outlet of the feed water heat exchanger (310) performs heat output; 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) performs electrical output; the outlet of the steam turbine low pressure cylinder (308) is connected to the second generator (209). 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 to the first exchange The inlet connection of the low pressure economizer of the heater group (301);

The outlet of the low-pressure superheater of the second heat exchanger group (303) is connected with the inlet of the low-pressure cylinder (308) of the steam turbine; the first one 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 water feed pump (314) is connected to the first road inlet of the first-stage high-pressure economizer (302); The second path in the outlet of the low pressure economizer of a heat exchanger group (301) is connected to the inlet of the medium pressure economizer of the second heat exchanger group (303) through the medium pressure feed 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 feedwater mixer The first inlet of (317) is connected; 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 feedwater The first outlet of the mixer (317) is connected to the inlet of the second solar heat collector (318); the outlet of the second solar heat collector (318) is connected to the second feedwater mixer (319) The first channel inlet of the first feedwater mixer (317) is connected to the second channel inlet of the second stage high pressure economizer (304); the second stage high pressure economizer The second outlet of the second feedwater mixer (304) is connected to the second inlet of the second feedwater mixer (319); the outlet of the second feedwater mixer (319) is connected to the third heat exchanger group (305). ) of the high pressure evaporator inlet connection.

Optionally, both the first solar thermal collector (316) and the second solar thermal collector (318) are trough solar thermal 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 outlet of (315) is connected to the second inlet of the low-pressure economizer of the first heat exchanger group (301); the second inlet of the 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 embodiments provided by the present invention, the present invention discloses the following technical effects:

The invention 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 respectively connected with the solid oxide fuel cell subsystem and the steam cycle subsystem; the steam cycle The subsystem is also connected with the double-effect absorption lithium bromide refrigeration subsystem. The solid oxide fuel cell subsystem can perform power generation and supplementary combustion, and 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. It can effectively utilize the waste heat generated by the high-temperature fuel cell and reduce the 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 cooler The system can provide cooling load to the user side, which reduces the energy loss of the system and improves the operating capability of the system while meeting the user's various energy requirements for cooling, heating and electricity.

Description of drawings

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

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

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention 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 performance of the system under the condition of satisfying the user's various energy requirements for cooling, heating and electricity. functional ability.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy according to the present invention, as shown in FIG. Supply system) including: solid oxide fuel cell subsystem, solar thermal complementary gas-steam combined cycle subsystem and double-effect absorption lithium bromide refrigeration subsystem, each subsystem is connected by 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 respectively connected with the solid oxide fuel cell subsystem and the steam cycle subsystem; 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, and a solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) 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 combined with the gas turbine. After the system exhaust gas is mixed in the flue gas mixer 205, the steam cycle subsystem in the solar-thermal complementary gas-steam combined cycle subsystem is driven to work together.

The solar thermal complementary gas-steam combined cycle subsystem is used for generating electricity and providing 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 to generate electricity, 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. 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 quality of the cycle work in the waste heat boiler increases, thereby Improve the power generation of the steam turbine; at the same time, the system extracts steam from the exhaust steam of the steam turbine in the waste heat boiler to heat the domestic hot water and output the 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-AC converter 107 and fuel cell after-combustion chamber 108 . In practical applications, the fuel cell is a solid oxide fuel cell.

Wherein, the second inlet of the gas mixer 101 is fed with methane; the third inlet of the gas mixer 101 is fed with 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 outlet of the 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 first inlet of the fuel cell after-combustion chamber 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 after-combustion chamber 108; the fuel cell The outlet of the gas heat exchanger 107 is used for electrical output; the outlet of the fuel cell after-combustion chamber 108 is connected to the second inlet of the gas heat exchanger 102; the second channel of the gas heat exchanger 102 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 the characteristics of clean and efficient operation, the power generation efficiency can theoretically reach more than 50%, the temperature of the exhaust gas discharged from the battery is high, and it has high utilization value and is easy to use with traditional power. 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 efficient power generation, cleanliness, and flexible fuel utilization.

The solar-thermal complementary gas-steam combined cycle subsystem introduces solar energy into an efficient 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 to 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 performs electrical output, that is, generates 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 feed water pump 312 , medium pressure feed water pump 313 , high pressure feed water pump 314 , first solar heat collector 316 , first feed water mixer 317 , second solar heat collector 318 and second feed water 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 consists 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 with the inlet of the waste heat boiler; and water, a soda-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 to the first inlet of the high pressure cylinder 306 of the steam turbine; the outlet of the high pressure cylinder 306 of the steam turbine is connected to the reheater of the third heat exchanger group 305 The inlet is connected; the outlet of the reheater of the third heat exchanger group 305 is connected to the inlet of the middle pressure cylinder 307 of the steam turbine; the first outlet of the middle pressure cylinder 307 of the steam turbine is connected to the inlet of the low pressure cylinder 308 of the steam turbine connection, the second outlet of the steam turbine intermediate pressure cylinder 307 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 feed water heat exchanger 310 performs heat output, that is, produces hot water 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 performs electrical output; the steam turbine low pressure cylinder The outlet of 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 feed water pump 312 is connected with 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 low pressure cylinder 308 of the steam turbine; the first path in the outlet of the low pressure economizer of the first heat exchanger group 301 is connected to the high pressure feeder. The inlet of the water pump 314 is connected; the first outlet of the high-pressure feed pump 314 is connected to 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 route in the middle pressure feed pump 313 is connected to the inlet of the medium pressure economizer of the second heat exchanger group 303 .

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 inlet of the first feedwater 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 inlets of the two solar collectors 318 are connected; the outlet of the second solar collector 318 is connected to the first inlet of the second feedwater mixer 319 ; the second outlet of the first feedwater mixer 317 It is connected with the second inlet of the second stage high pressure economizer 304; the second outlet of the second stage high pressure economizer 304 is connected with the second inlet of the second feedwater mixer 319; 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 The outlet of the flue gas mixer 205 flows through the first heat exchanger group 301 , the first-stage high pressure economizer 302 and the second heat exchanger group 303 . 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 in FIG. It is the direction of the flue gas, the heat exchanger is composed of pipes, the soda water flows 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 to the reheater inlet of the third heat exchanger group (305).

The first solar thermal collector 316 and the second solar thermal collector 318 are both trough solar thermal 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 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 first outlet is connected to the second inlet of the low-pressure economizer of the first heat exchanger group 301; the second inlet of the double-effect absorption lithium bromide refrigerator 315 is connected to the chilled water inlet; the The second outlet of the double-effect absorption lithium bromide refrigerator 315 performs cold output, that is, produces chilled water effluent as a cooling load.

Referring to FIG. 1 , the working process of the combined cycle cooling, heating and power cogeneration system integrating fuel cells and solar energy according to the present invention is described as follows.

Methane is respectively fed into the gas mixer 101 of the solid oxide fuel cell subsystem and the combustion chamber 202 of the gas turbine subsystem, and the solid oxide fuel cell undergoes an electrochemical reaction to generate electricity; methane is burned in the combustion chamber 202 of the gas turbine subsystem, The exhaust gas from the combustion chamber 202 drives the gas turbine 203 to work and generate electricity, and the first generator 204 outputs electricity. The solid oxide fuel cell exhaust is mixed with the gas turbine 203 exhaust 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 and 318 start to work, and the quality of the circulating work in the waste heat boiler increases, thereby increasing the power generation of the steam turbines 306, 307 and 308; The steam is extracted from the first heat exchanger group (also called low-pressure steam drum) 301 in the waste heat boiler and the exhaust steam of the middle-pressure cylinder 307 of the steam turbine, to drive the double-effect absorption lithium bromide refrigerator 315 to work and heat domestic hot water, The cooling load (chilled water outlet) and the heating load (hot water) are output to the user side.

Specifically, when the co-supply system works under a certain solar radiation intensity, the feed water at the outlet of the high-pressure feed pump 314 is divided into two lines, and in one line, the feed water at the outlet of the high-pressure feed pump 314 enters the first solar collector The solar thermal energy is absorbed in the solar collector 316. When the temperature of the outlet feedwater of the first solar collector 316 is the same as the temperature of the outlet feedwater of the first-stage high-pressure economizer 302, the outlet feedwater of the first solar collector 316 is the same as the first-stage high-pressure economizer 302. The feed water from the outlet of the device 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 from the outlet of the first feedwater mixer 317 enters the second solar collector 318 to absorb solar thermal energy. When the temperature of the feed water at the outlet of the second stage high pressure economizer 304 is the same as the temperature of the feed water at the outlet of the second stage high pressure economizer 304, the feed water at the outlet of the second solar collector 318 and the outlet feed water of the second stage high pressure economizer 304 enter the second feed water mixer 319 After mixing, 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 co-generation system maintains a normal working state by burning methane, and the fuel cell, gas turbine 203 and steam turbine (including the steam turbine high pressure cylinder 306, the steam turbine medium pressure cylinder 307, and the steam turbine low pressure cylinder 308) generate electricity normally. , while the double-effect absorption lithium bromide refrigerator 315 and the feed water heat exchanger 310 provide cooling load and heating domestic hot water to the user side.

The invention discloses a combined cycle cooling, heating and power supply system integrating fuel cells and solar energy, the combined supply system comprising a solid oxide fuel cell (SOFC) subsystem, a solar thermal complementary gas-steam combined cycle (ISCC) subsystem and Double-effect absorption lithium bromide refrigeration subsystem. The co-generation 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 of the gas turbine subsystem and enters the waste heat boiler together; the waste heat boiler is used as a waste heat recovery carrier, and solar energy is used instead. The partial 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 joint supply 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, this co-generation system extracts part of the steam from the exhaust steam of the medium-pressure cylinder, and uses this steam to heat the domestic hot water. Therefore, the co-supply system provided by the present invention 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 users for cooling, heating and electricity; and efficiently utilize renewable energy Energy - solar energy, improve the working ability of the system.

A specific embodiment is provided below to illustrate the technical effect of the joint supply system provided by the present invention. In this embodiment, the natural gas from the West-East Gas Pipeline is selected as the fuel, and the weather data is selected from the data of 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 co-supply system operates under a typical daily stable working condition in Lhasa, considering the solar energy input heat, its energy efficiency reaches 61.9%,

The efficiency is 52.61%.

The invention discloses a combined cycle cooling, heating and power cogeneration system integrating fuel cells and solar energy. In view of 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 gas temperature is equivalent to that of the gas turbine exhaust gas, so mixing the two 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 loss in the system . The co-supply system has a reasonable structure coupled with trough solar collectors, uses solar collectors to replace part of the heat load of the waste heat boiler, improves the flue gas utilization rate of the waste heat boiler, increases the power generation of the steam cycle subsystem, and further Improve the performance of the system. Therefore, compared with the traditional integrated way, the co-supply system provided by the present invention has significant thermodynamic advantages.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the control method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. A combined cycle combined cooling, heating and power system integrating a fuel cell with 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: the device 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 inlet of the gas heat exchanger (102); the first path 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 path outlet of the gas heat exchanger (102) is connected with the first path inlet of the air heat exchanger (105); the second outlet of the air heat exchanger (105) is connected with the gas turbine subsystem.

2. The combined cycle combined cooling heating and power system according to claim 1, wherein the fuel cell is a solid oxide fuel cell.

3. The integrated fuel cell and solar combined cycle combined heat, power and cold 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 (202) 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; the inlet of the combustion chamber (202) is filled with methane.

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 high-pressure superheater outlet of the third heat exchanger group (305) is connected with the first path of inlet of the steam turbine high-pressure cylinder (306); the outlet of the high-pressure turbine cylinder (306) is connected with the inlet of the reheater of the third heat exchanger group (305); the outlet of the 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 electrical output is performed through the second generator (209); 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 feed water 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 feeding 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 inlet of the second water supply mixer (319); a second outlet of the first water supply 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 cooling, heating 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 of outlets of low-pressure evaporators of the first heat exchanger group (301) is connected with a first path of inlets of the double-effect absorption type lithium bromide refrigerating machines (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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