CN115788615A - Coupled combustion power generation system - Google Patents
Coupled combustion power generation system Download PDFInfo
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- CN115788615A CN115788615A CN202211596883.8A CN202211596883A CN115788615A CN 115788615 A CN115788615 A CN 115788615A CN 202211596883 A CN202211596883 A CN 202211596883A CN 115788615 A CN115788615 A CN 115788615A
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Abstract
The invention belongs to the technical field of power generation by utilizing waste heat, and relates to a coupled combustion power generation system, which comprises combustion equipment and supercritical CO 2 A Brayton cycle power plant and an organic Rankine cycle ORC power plant; the combustion equipment is supercritical CO 2 Brayton cycle power plant providing CO 2 Working medium; the supercritical CO2 Brayton cycle power generation equipment forms a cycle system by a cooler, a compressor, a heat regenerator, a heater, a generator and a turbine; the organic Rankine cycle ORC power generation equipment is a system of one cycle formed by an evaporator, a turbine, a generator, a condenser and a solution pump; the heat regenerator is connected with the heat regenerator through a pipelineConnected to an evaporator, which is connected to a cooler by a pipe, so that CO 2 The residual heat of the working medium can be absorbed and utilized by the organic working medium in the evaporator. The organic Rankine cycle ORC power generation equipment utilizes the cooled CO2 working medium waste heat of the supercritical CO2 Brayton cycle power generation equipment to generate power, and a system for gradient utilization of waste heat resources is formed, so that the waste heat resources are efficiently utilized.
Description
Technical Field
The invention belongs to the technical field of power generation by utilizing waste heat, and particularly relates to a coupled combustion power generation system.
Background
Waste heat resources generally exist in the current industry and other fields, and are increasingly paid more attention by people under the large background of energy shortage and environmental crisis to improve the energy utilization rate and reduce the fuel consumption. Waste heat utilization is an important means for improving energy utilization efficiency.
The supercritical brayton cycle is currently an advantageous form of cycle among many thermodynamic cycles. The novel supercritical working medium such as carbon dioxide has the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduces the equipment volume and has very high economical efficiency. And working media such as carbon dioxide and the like have very stable thermophysical properties in the temperature range of the prior waste heat recovery field, do not have the problem of thermal decomposition, and can be completely used for recovering partial heat at high temperature.
In a novel waste heat recovery system, an ORC technology is mostly adopted abroad, and at present, the ORC technology is not generally applied at home but is popularized. The ORC system is known as a thermodynamic cycle mode with high thermal efficiency at low temperature, and uses organic working media with large molecular weight and low boiling point to replace water as a circulating medium, so that the ORC system has the characteristic of compact equipment. As the applicable temperature of the ORC system is below 300 ℃, most organic working media have the problem of thermal decomposition for medium-high temperature and high-temperature hot trips higher than 400 ℃. Therefore, it is difficult to recover the waste heat of the waste heat resources above 400 ℃ by using ORC directly to generate the waste heat.
Therefore, it is necessary to provide a combustion power generation system capable of more efficiently utilizing waste heat resources.
Disclosure of Invention
The invention aims to provide a coupled combustion power generation system which can efficiently utilize waste heat resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coupled combustion power generation system comprises a combustion device and supercritical CO 2 A Brayton cycle power plant and an organic Rankine cycle ORC power plant; the combustion equipment is the supercritical CO 2 Brayton cycle power plant providing CO 2 Working medium; the supercritical CO2 Brayton cycle power generation equipment forms a cycle system by a cooler, a compressor, a heat regenerator, a heater, a generator and a turbine; the organic Rankine cycle ORC power generation equipment is a system of one cycle formed by an evaporator, a turbine, a generator, a condenser and a solution pump; the regenerator is connected to the evaporator by a pipe, and the evaporator is connected to the cooler by a pipe, so that CO 2 The residual heat of the working medium can be absorbed and utilized by the organic working medium in the evaporator.
Preferably, in the above coupled combustion power generation system: the combustion apparatus is configured to treat CO prior to entering the heater 2 And preheating the working medium.
Preferably, in the above coupled combustion power generation system: the combustion device is configured to preheat the organic working medium in the evaporator.
Preferably, in the above coupled combustion power generation system: the hot water generated by the combustion device is preheated by the preheating assembly.
Preferably, in the above coupled combustion power generation system: the heat absorbed by the organic working medium in the evaporator is partially from CO 2 And part of the waste heat of the working medium comes from the combustion equipment.
Preferably, in the above coupled combustion power generation system: the combustion equipment comprises a CO2 capture device and a combustion furnace, and CO generated by the combustion furnace 2 Gas passing gas treatment and the CO 2 The trapping device obtains pure CO 2 A gas.
Preferably, in the above coupled combustion power generation system: the combustion plant further comprises a CO2 storage device and a valve, the CO 2 The storage device is connected to the supercritical CO through a pipeline 2 The cooler of the brayton cycle power plant and the valve are arranged on the pipe.
Preferably, in the above coupled combustion power generation system: the combustion apparatus and the supercritical CO 2 Brayton cycle power plants forming a closed CO 2 System
The coupling combustion power generation system has the beneficial effects that: the organic Rankine cycle ORC power generation equipment utilizes the cooled CO2 working medium waste heat of the supercritical CO2 Brayton cycle power generation equipment to generate power, a system for utilizing waste heat resources in a gradient manner is formed, and therefore the waste heat resources are efficiently utilized.
Drawings
FIG. 1 is a schematic diagram of a coupled combustion power generation system according to an embodiment of the present invention.
The component names and designations in the drawings are as follows:
cooler 1, compressor 2, heat regenerator 3, heater 4, generator 5, turbine 6, CO 2 Trap device 7, combustion furnace 8, CO 2 Storage device 9, generator 10, turbine 11, evaporator 12, solution pump 13, condenser 14, valve 15.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As shown in FIG. 1, the present embodiment discloses a coupled combustion power generation system, which comprises a combustion device and supercritical CO 2 Brayton cycle power plants and organic Rankine cycle ORC power plants. This example will supercritical CO 2 The Brayton cycle power generation equipment and the organic Rankine cycle ORC power generation equipment are combined to form a system for gradient utilization of waste heat resources, so that the waste heat resources are efficiently utilized.
In particular, the combustion apparatus comprises CO 2 Trap device 7, combustion furnace 8, CO 2 Storage device 9, valve 15. Supercritical CO 2 The Brayton cycle power generation device comprises a cooler 1, a compressor 2, a heat regenerator 3, a heater 4, a generator 5 and a turbine 6. The organic rankine cycle ORC power plant includes a generator 10, a turbine 11, an evaporator 12, a solution pump 13, and a condenser 14.
Supercritical CO alone 2 The working process of the Brayton cycle power generation equipment is as follows: low temperature low pressure supercritical CO 2 After the pressure of the working medium is increased by the compressor 2, the heat exchange is carried out by the waste gas discharged by the heat regenerator 3 and the turbine 6, the working medium is further heated by the heater 4 after being preheated to a certain temperature, and then the working medium enters the turbine 6 to expand and do work to drive the generator 5 to generate electricity. Exhaust gas after doing work is discharged from the air cylinder, enters the heat regenerator 3 to exchange heat with low-temperature high-pressure working medium discharged from the compressor 2, so that the purpose of precooling is achieved, the cooled working medium enters the cooler 1 to be further cooled, and finally enters the compressor 2 to be compressed, and the whole cycle is completed.
The working process of the single organic rankine cycle ORC power plant is as follows: the organic working medium absorbs heat in the evaporator 12 to generate steam with certain pressure and temperature, and the steam enters the turbine 11 to expand and do work, so that the generator 10 is driven to generate electricity. The steam discharged from the turbine 11 releases heat to the cooling water in the condenser 14, condenses into a liquid state, and finally returns to the evaporator 12 by the solution pump 13, thus continuously circulating. The working medium used by the organic rankine cycle ORC power generation device of the embodiment can be various, is determined according to the working temperature range, and is not limited to R245fa, R134fa, R123 and the like.
Supercritical CO of the example 2 The Brayton cycle power plant is coupled with an organic Rankine cycle ORC power plant. The specific coupling mode is as follows: the regenerator 3 is connected to the evaporator 12 by a pipe, and the evaporator 12 is connected to the cooler 1 by a pipe. Make supercritical CO 2 CO generated after power generation backflow of Brayton cycle power generation equipment 2 The waste heat of the working medium can be absorbed and utilized by the organic medium in the evaporator 12 of the organic Rankine cycle ORC power generation equipment.
In particular, low temperature low pressure supercritical CO 2 After the pressure of the working medium is increased by the compressor 2, the heat exchange is carried out by the waste gas discharged by the heat regenerator 3 and the turbine 6, the working medium is further heated by the heater 4 after being preheated to a certain temperature, and then the working medium enters the turbine 6 to expand and do work to drive the generator 5 to generate electricity. Exhaust gas after work is exhausted from the cylinder, enters the heat regenerator 3 to exchange heat with low-temperature high-pressure working medium exhausted from the compressor 2, the temperature is reduced, and the cooled CO 2 Before the working medium enters the cooler 1, the cooled CO 2 The waste heat of the working medium is absorbed by an evaporator 12 of the organic Rankine cycle ORC power generation plant for evaporation of the organic working medium of the organic Rankine cycle ORC power generation plant. Cooled CO 2 The working medium enters a cooler 1 for further cooling, and the cooler 1 cools CO 2 The working medium is cooled to the vicinity of the critical point and enters the compressor 2 to complete the circulation.
The organic working medium is cooled in the evaporator 12 from the cooled CO 2 The waste heat of the working medium is added with the waste heat obtained from the combustion equipment to generate steam with certain pressure and temperature, and the steam enters the turbine 11 to expand and do work, so that the generator 10 is driven to generate electricity. The steam discharged from the turbine 11 releases heat to the cooling water in the condenser 14, condenses into a liquid state, and finally returns to the evaporator 12 by the solution pump 13, thus continuously circulating.
Supercritical CO 2 The Brayton cycle power plant utilizes waste heat in the range of about 400-600 ℃. The waste heat temperature utilized by an organic rankine cycle ORC power plant is below 300 ℃, typically 150 ℃. This implementationAn exemplary organic Rankine cycle ORC power plant utilizes supercritical CO 2 Cooled CO for Brayton cycle power plant 2 The power generation is carried out by the waste heat of the working medium, so that the waste heat resource is efficiently utilized. This example was conducted by subjecting supercritical CO 2 The Brayton cycle power generation equipment and the organic Rankine cycle ORC power generation equipment are combined to form a system for gradient utilization of waste heat resources.
The combustion furnace 8 of the combustion equipment burns, releases heat to hot water at the same time, the hot water enters the preheating assembly, and the preheating assembly is used for preheating supercritical CO 2 CO in Brayton cycle power plant before entering heater 4 2 Preheating working medium to improve supercritical CO 2 The power generation efficiency of a Brayton cycle power plant. I.e. supercritical CO 2 Brayton cycle power plants utilize the waste heat of combustion plants.
The preheating assembly is also used for preheating the organic working medium in the evaporator 12 of the organic Rankine cycle ORC power generation equipment so as to improve the power generation efficiency of the organic Rankine cycle ORC power generation equipment. The preheated heat is, as above, the waste heat of the organic working medium directly obtained from the combustion device in the evaporator 12,
CO produced by combustion in furnace 8 2 Gas passing gas treatment and CO 2 The trapping device 7 obtains pure CO 2 Gaseous, pure CO 2 Gas enters CO through a pipeline 2 The storage device 9 stores. CO2 2 The storage device 9 is connected to the supercritical CO by a pipeline 2 The cooler 1 of a Brayton cycle power plant is provided with a valve 15 in the line, the valve 15 being used for the controlled release of CO 2 Enters a cooler 1 to form closed supercritical CO 2 System and carbon emission is reduced.
This example will supercritical CO 2 The Brayton cycle power generation plant is combined with an organic Rankine cycle ORC power generation plant to form a compact system and flexible control.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The coupled combustion power generation system is characterized by comprising combustion equipment and supercritical CO 2 A Brayton cycle power plant and an organic Rankine cycle ORC power plant; the combustion equipment is the supercritical CO 2 Brayton cycle power plant providing CO 2 Working medium; the supercritical CO2 Brayton cycle power generation equipment forms a circulating system by a cooler (1), a compressor (2), a heat regenerator (3), a heater (4), a generator (5) and a turbine (6); the organic Rankine cycle ORC power generation equipment forms a system of one cycle by an evaporator (12), a turbine (11), a generator (10), a condenser (14) and a solution pump (13); the regenerator (3) is connected to the evaporator (12) by a pipe, and the evaporator (12) is connected to the cooler (1) by a pipe, so that CO 2 The residual heat of the working medium can be absorbed and utilized by the organic working medium in the evaporator (12).
2. The coupled combustion power generation system of claim 1, wherein: the combustion device is configured to treat CO before entering the heater (4) 2 And preheating the working medium.
3. The coupled combustion power generation system of claim 1, wherein: the combustion device is configured to preheat the organic working medium in the evaporator (12).
4. The coupled combustion power generation system of claim 2 or 3, wherein: the hot water generated by the combustion device is preheated by the preheating assembly.
5. According toThe coupled combustion power generation system of claim 1, wherein: the heat absorbed by the organic working medium in the evaporator (12) is partially derived from CO 2 And part of the waste heat of the working medium comes from the combustion equipment.
6. The coupled combustion power generation system of claim 1, wherein: the combustion equipment comprises a CO2 capturing device (7) and a combustion furnace (8), wherein CO generated by the combustion furnace (8) is 2 Gas passing gas treatment and the CO 2 The trapping device (7) obtains pure CO 2 A gas.
7. The coupled combustion power generation system of claim 6, wherein: the combustion plant further comprises a CO2 storage means (9) and a valve (15), the CO 2 The storage device (9) is connected to the supercritical CO by a pipeline 2 The cooler (1) of a Brayton cycle power plant and the valve (15) are arranged on the line.
8. The coupled combustion power generation system of claim 1, wherein: the combustion apparatus and the supercritical CO 2 Brayton cycle power plant forming a closed CO 2 Provided is a system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211596883.8A CN115788615A (en) | 2022-12-12 | 2022-12-12 | Coupled combustion power generation system |
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| CN202211596883.8A CN115788615A (en) | 2022-12-12 | 2022-12-12 | Coupled combustion power generation system |
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