CN113027555A - Air-steam double-medium coupling circulation efficient power generation system - Google Patents
Air-steam double-medium coupling circulation efficient power generation system Download PDFInfo
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- CN113027555A CN113027555A CN202110423687.XA CN202110423687A CN113027555A CN 113027555 A CN113027555 A CN 113027555A CN 202110423687 A CN202110423687 A CN 202110423687A CN 113027555 A CN113027555 A CN 113027555A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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Abstract
The invention provides an air-steam double-medium coupling circulation efficient power generation system, and belongs to the technical field of power equipment. It has solved the lower problem of current power generation system generating efficiency. The air-steam double-medium coupling circulation efficient power generation system comprises a boiler power generation device, a first compressor, a second compressor and an expander, wherein the first compressor, the second compressor and the expander are sequentially connected in series through pipelines, the boiler power generation device comprises a boiler, a flue which is connected with the boiler and used for discharging tail gas, and a steam-water pipe network with a to-be-heated section, a cooler is further connected between the first compressor and the second compressor in series, the to-be-heated section is connected to the cooler, medium in the to-be-heated section can absorb heat of compressed air discharged by the first compressor, a heat exchanger is further arranged at the flue, and a pipeline between the expander and the second compressor is connected to the heat exchanger and can exchange heat with the tail gas in the flue. The air-steam double-medium coupling circulation efficient power generation system has the advantage of high power generation efficiency.
Description
Technical Field
The invention belongs to the technical field of power equipment, and relates to an air-steam double-medium coupling circulation efficient power generation system.
Background
Electric energy is widely applied to various fields such as power, illumination, chemistry, textile, communication, broadcasting and the like, and plays an important role in our lives. The use of various other energy sources for power generation is a major approach to electrical energy generation.
For example, people have designed compressed air energy storage pressure regulating and expander system of doing work to have applied for chinese patent, its application number is: 201710769719.5, respectively; the publication number is as follows: CN 107401499A; the system comprises an energy storage system, a pressure regulating system and an acting system which are sequentially connected, and a temperature regulating system which is positioned on the energy storage system and the acting system, wherein the energy storage system comprises a motor, a plurality of air compressors which are connected with the motor in series, and a compressed air storage tank which is connected with the last air compressor, the pressure regulating system comprises an adjustable pressure matcher and an automatic control device, the adjustable pressure matcher is connected with the compressed air storage tank and regulates pressure through the automatic control device, the acting system comprises a plurality of air expanders which are connected with the adjustable pressure matcher in series, and a generator which is connected with the air expanders, the temperature regulating system is arranged at the adjustable pressure matcher, the inlet of the air expanders is arranged, and the air expanders do work outwards by forming high-temperature medium-pressure airflow through the temperature regulating system and the adjustable pressure. The system compresses air through a plurality of air compressors connected in series, stores the compressed air in a compressed air storage tank, releases the compressed air to a plurality of air expanders connected in series to do work when needed, and drives a generator to generate electricity.
In the working process of the system, air needs to be compressed for multiple times by a plurality of air compressors connected in series, but the temperature of the compressed air can be increased along with the compression of the air, the air with the increased temperature can generate larger resistance to further compression, larger mechanical energy is needed to further compress the air, the energy consumption loss of the whole system is large, and the power generation efficiency is low.
Disclosure of Invention
The invention aims to provide an air-steam double-medium coupling circulation efficient power generation system aiming at the problems in the prior art, and solves the problem that the existing power generation system is low in power generation efficiency.
The purpose of the invention can be realized by the following technical scheme:
the air-steam double-medium coupling circulation efficient power generation system comprises a boiler power generation device, a first compressor, a second compressor and an expander, wherein the first compressor, the second compressor and the expander are sequentially connected in series through pipelines, the boiler power generation device comprises a boiler, a flue which is connected with the boiler and used for discharging tail gas, and a steam-water pipe network with a to-be-heated section, the steam-water pipe network is characterized in that a cooler is further connected between the first compressor and the second compressor in series, the to-be-heated section is connected to the cooler, medium in the to-be-heated section can absorb heat of compressed air discharged by the first compressor, a heat exchanger is further arranged at the flue, and a pipeline between the expander and the second compressor is connected to the heat exchanger and can exchange heat with the tail gas in.
The boiler power generation device is a power generation system commonly used in the existing power plant, the power generation is carried out by burning fuel in a boiler to generate heat, tail gas generated after the fuel is burnt is discharged through a flue, and is discharged into air from a chimney after being sequentially subjected to treatments such as pin removal, air preheating, electric dust removal, desulfurization and the like; the steam-water pipe network is a pipeline system which can enable water flow to flow in a circulating manner in the pipe network and continuously undergo heating and cooling processes, and is used in cooperation with structures such as a boiler, wherein a medium with relatively low temperature flows in a section to be heated, and the medium is required to be heated by a low-pressure heater and then recycled.
When the air-steam double-medium coupling circulation high-efficiency power generation system is used, air is primarily compressed by the first compressor, the compressed air pressure and temperature rise, the compressed air sent out from the first compressor enters the cooler through the pipeline, heat exchange is carried out between the medium in the section to be heated in the steam-water pipe network and the compressed air, the heat of the compressed air is absorbed, the compressed air is cooled and then enters the second compressor to be compressed again, the compressed air after being compressed passes through the heat exchanger in the flue before entering the expander to do work, the heat of high-temperature tail gas in the flue is absorbed, and the compressed air finally reaches a high-temperature high-pressure state and then enters the expander to do work.
In the working process, the section to be heated of the boiler power generation device is selected to absorb the heat of the compressed air, so that the temperature of the compressed air is reduced, the resistance and the energy consumption of the compressor II for compressing the air on the next step are reduced, the heating energy consumption in a steam-water pipe network is reduced, the energy consumption is further reduced, and the power generation efficiency is improved. In the boiler power generation device, the temperature of the tail gas discharged from the flue is very high, the heat of the boiler tail gas can be reused through the arrangement of the heat exchanger, the temperature of the compressed air is improved in a heat transfer mode, the temperature of the compressed air reaches or even exceeds the standard of entering the expansion machine to do work, the heat of the tail gas is fully utilized, the energy loss of tail gas treatment is reduced, the work doing efficiency of the expansion machine is also improved, and the power generation efficiency is further improved. In the system, the redundant heat in the expander work system is transferred to another system in a mode of coupling the expander work system and the boiler power generation device, so that the energy loss is reduced, and the power generation efficiency is improved.
In the air-steam double-medium coupling circulation efficient power generation system, the boiler power generation device further comprises an air inlet duct communicated with the boiler, and an air outlet of the expander is communicated to the air inlet duct through an exhaust pipe. The boiler needs to supply air into the boiler through the air inlet duct in the combustion process so as to ensure that sufficient oxygen is available in the combustion process, and air with a certain temperature after doing work in the expansion machine is sent into the boiler through the air inlet duct, so that the heat of exhaust can be changed into effective input heat of the boiler, the heat loss is reduced, and the overall power generation efficiency is improved.
In the air-steam double-medium coupling circulation efficient power generation system, the exhaust pipe is arranged obliquely relative to the air inlet duct, and an included angle between the air inlet direction of the exhaust pipe and the air inlet direction of the air inlet duct is an acute angle. The exhaust pipe is obliquely arranged, so that the kinetic energy loss of wind power between the two air inlet pipelines can be reduced, and the utilization rate of energy is ensured.
In the above air-steam double-medium coupled cycle high-efficiency power generation system, the pipeline between the expander and the second compressor is further connected with an external heat source heater capable of heating the compressed air in the pipeline. The heat generated by combustion of hydrogen, natural gas, multi-source solid waste and the like can be flexibly coupled to heat air according to needs, and the work doing and power generating efficiency of the expansion machine is improved.
In the air-steam double-medium coupling circulation efficient power generation system, the power generation system further comprises a third compressor connected in series between the second compressor and the expander through a pipeline, a cooler is further connected in series between the second compressor and the third compressor, and a section to be heated of the steam-water pipe network is connected to the cooler and can absorb heat of compressed air discharged by the second compressor. The pressure requirement of the compressed air entering the expansion machine is high, the compressed air can reach the requirement in a multi-stage compression mode, meanwhile, coolers can be arranged among the multi-stage compressors, the heat of the compressed air is absorbed by low-temperature media in a steam-water pipe network, resistance and energy consumption are further reduced for multi-stage air compression, and the power generation efficiency is further improved.
In the air-steam double-medium coupling circulation efficient power generation system, the heat exchanger comprises a first heat exchanger and a second heat exchanger which are both arranged at the flue, the pipeline sequentially penetrates through the first heat exchanger and the second heat exchanger and then is connected to the inlet of the expansion machine, and the first heat exchanger is closer to the outlet end of the flue relative to the second heat exchanger. Through the different temperature tail gases of different positions in the flue, set up a plurality of heat exchangers and heat compressed air, heat utilization rate is high.
Compared with the prior art, the air-steam double-medium coupling circulation efficient power generation system transfers redundant heat to another system for reuse by coupling the expansion work-applying power generation device with the boiler power generation device, thereby reducing unnecessary energy loss and energy consumption and improving the power generation efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the air-steam double-medium coupling cycle high-efficiency power generation system.
In the figure, 1, a compressor I; 2. a second compressor; 3. a third compressor; 4. an expander; 5. a boiler; 6. a flue; 7. a steam-water pipe network; 71. a section to be heated; 8. a cooler; 9. a heat exchanger; 10. an air inlet duct; 11. an exhaust pipe; 12. an external heat source heater.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the air-steam double-medium coupled cycle high-efficiency power generation system comprises a boiler 5 power generation device and an expansion work power generation device. The boiler 5 power generation device comprises a boiler 5, a flue 6 connected with the boiler 5 and used for discharging tail gas, an air inlet duct 10 connected with the boiler 5 and used for inlet air, and a steam-water pipe network 7 with a section to be heated 71. The expansion work-doing power generation device comprises a compressor I1, a compressor II 2, a compressor III 3 and an expander 4 which are sequentially connected in series through pipelines, and the expander 4 is connected with a power generator.
A cooler 8 is respectively connected in series between the first compressor 1 and the second compressor 2 and between the second compressor 2 and the third compressor 3, the sections to be heated 71 of the steam-water pipe network 7 are respectively connected to the two coolers 8, and the heat of the compressed air discharged by the first compressor 1 and the second compressor 2 can be absorbed by the medium in the sections to be heated 71 so as to heat the medium in the sections to be heated 71.
A heat exchanger 9 is also arranged in the flue 6, and a pipeline between the third compressor 3 and the expander 4 is connected into the heat exchanger 9 and can exchange heat with tail gas in the flue 6 to increase the temperature of compressed air in the pipeline. In this embodiment, the heat exchanger 9 includes a first heat exchanger and a second heat exchanger both disposed in the flue 6, the pipeline sequentially passes through the first heat exchanger and the second heat exchanger and then is connected to the inlet of the expander 4, the first heat exchanger is closer to the outlet end of the flue 6 than the second heat exchanger, and an external heat source heater 12 capable of heating the compressed air in the pipeline is further connected in series between the first heat exchanger and the second heat exchanger.
The air outlet of the expander 4 is communicated to an air inlet duct 10 of the boiler 5 through an exhaust pipe 11, so that the air exhausted from the expander 4 is sent to the boiler 5 along the air inlet duct 10 to reuse the heat of the exhaust gas. In order to make the exhaust and intake of the expander 4 smoother, the exhaust pipe 11 may be disposed obliquely with respect to the intake duct 10, and an angle between the intake direction of the exhaust pipe 11 and the intake direction of the intake duct 10 is an acute angle. The specific angle of the acute angle may be 15 to 60 °.
The boiler 5 power generation device is a power generation system commonly used in the existing power plant, the power generation is carried out by burning fuel in the boiler 5 to generate heat, tail gas generated after the fuel is burnt is discharged through a flue 6, and is discharged into air from a chimney after being sequentially subjected to treatments such as pin removal, air preheating, electric precipitation, desulfurization and the like; the steam-water pipe network 7 is a pipeline system which can enable water flow to flow in a circulating manner in the pipe network and continuously undergo heating and cooling processes, and is used in cooperation with structures such as the boiler 5, wherein a medium with relatively low temperature flows in the section 71 to be heated, and the medium needs to be heated by a low-pressure heater and then is recycled, so that a pipeline before passing through the low-pressure heater can be selected as the section 71 to be heated.
When the air-steam double-medium coupling circulation efficient power generation system is used, air is primarily compressed by the compressor I1, the compressed air pressure and temperature rise, the compressed air sent out from the compressor I1 enters the cooler 8 through the pipeline, heat exchange is carried out between the medium in the section to be heated 71 in the steam-water pipe network 7 and the compressed air, the heat of the compressed air is absorbed, the compressed air is cooled and then enters the compressor II 2 again to be compressed, the compressed air after secondary compression is cooled by the next-stage cooler 8 and then is sent into the compressor III 3 to be compressed for the third time, and according to actual conditions, the number of the compressors can be correspondingly increased or reduced. Before the compressed air enters the expansion machine 4 to do work, the compressed air firstly passes through the first heat exchanger and the second heat exchanger in the flue 6 to absorb heat of high-temperature tail gas in the flue 6, so that the compressed air finally reaches a high-temperature and high-pressure state, if the heat exchange effect is not ideal, heat generated by combustion of fuels such as hydrogen, natural gas and multi-source solid waste can be used for additionally heating the compressed air in a pipeline through the external heat source heater 12, and the heated compressed air enters the expansion machine 4 to do work and drive the generator to generate electricity. After the work is done, the air in the expansion machine 4 is discharged from the exhaust pipe 11 and enters the air inlet duct 10, and is fed into the boiler 5 along with the wind power in the air inlet duct 10, so as to provide oxygen and heat for the combustion of the fuel in the boiler 5.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. The air-steam double-medium coupling circulation efficient power generation system comprises a boiler (5) power generation device, a first compressor (1), a second compressor (2) and an expander (4) which are sequentially connected in series through pipelines, wherein the boiler (5) power generation device comprises a boiler (5), a flue (6) connected with the boiler (5) and used for exhausting tail gas, and a steam-water pipe network (7) provided with a section to be heated (71), the steam-water pipe network is characterized in that a cooler (8) is further connected in series between the first compressor (1) and the second compressor (2), the section to be heated (71) is connected to the cooler (8), medium in the section to be heated (71) can absorb heat of compressed air exhausted by the first compressor (1), a heat exchanger (9) is further arranged at the flue (6), and a pipeline between the expander (4) and the second compressor (2) is connected to the heat exchanger (9) and can perform heat exchange with the tail gas in the flue (6) And (4) exchanging.
2. The air-steam double-medium coupling circulation high-efficiency power generation system as claimed in claim 1, wherein the power generation device of the boiler (5) further comprises an air inlet duct (10) communicated with the boiler (5), and an air outlet of the expansion machine (4) is communicated to the air inlet duct (10) through an exhaust pipe (11).
3. The air-steam double-medium coupling circulation efficient power generation system as claimed in claim 2, wherein the exhaust pipe (11) is arranged obliquely relative to the air inlet duct (10), and an included angle between an air inlet direction of the exhaust pipe (11) and an air inlet direction of the air inlet duct (10) is an acute angle.
4. The air-steam double-medium coupled cycle high-efficiency power generation system according to claim 1, 2 or 3, characterized in that an external heat source heater (12) capable of heating compressed air in a pipeline is further connected to the pipeline between the expander (4) and the second compressor (2).
5. The air-steam double-medium coupled cycle high-efficiency power generation system according to claim 1, 3 or 4, characterized in that the power generation system further comprises a compressor III (3) connected in series between the compressor II (2) and the expander (4) through a pipeline, a cooler (8) is further connected in series between the compressor II (2) and the compressor III (3), and the section (71) to be heated of the steam-water pipe network (7) is connected to the cooler (8) and can absorb heat of the compressed air discharged by the compressor II (2).
6. An air-steam double medium coupling circulation high-efficiency power generation system according to claim 1, 2 or 3, characterized in that the heat exchanger (9) comprises a first heat exchanger and a second heat exchanger which are both arranged at the flue (6), the pipeline passes through the first heat exchanger and the second heat exchanger in sequence and then is connected to the inlet of the expander (4), and the first heat exchanger is closer to the outlet end of the flue (6) relative to the second heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423687.XA CN113027555A (en) | 2021-04-20 | 2021-04-20 | Air-steam double-medium coupling circulation efficient power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110423687.XA CN113027555A (en) | 2021-04-20 | 2021-04-20 | Air-steam double-medium coupling circulation efficient power generation system |
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| CN113027555A true CN113027555A (en) | 2021-06-25 |
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| CN202110423687.XA Pending CN113027555A (en) | 2021-04-20 | 2021-04-20 | Air-steam double-medium coupling circulation efficient power generation system |
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- 2021-04-20 CN CN202110423687.XA patent/CN113027555A/en active Pending
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