CN212108324U - Embedded thermal power emission reduction system for photo-thermal heat storage - Google Patents
Embedded thermal power emission reduction system for photo-thermal heat storage Download PDFInfo
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- CN212108324U CN212108324U CN202020103129.6U CN202020103129U CN212108324U CN 212108324 U CN212108324 U CN 212108324U CN 202020103129 U CN202020103129 U CN 202020103129U CN 212108324 U CN212108324 U CN 212108324U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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Abstract
The utility model relates to an embedded thermoelectricity emission reduction system of light and heat-retaining, include: boiler and steam turbine power generation system who has multistage extraction of steam, its characterized in that, including solar energy spotlight heat collector and/or solid heat accumulation body, the steam that solar energy spotlight heat collector and/or solid heat accumulation body produced gets into steam turbine power generation system's high pressure heater and/or low pressure heater and/or oxygen-eliminating device carry out the heat transfer to as heating heat source heating steam turbine condensation return water, the comdenstion water after the heat transfer gets back again get into next circulation in solar energy spotlight heat collector and/or the solid heat accumulation body. The system has low comprehensive cost, improves the generating efficiency of the turbonator while reducing the coal consumption and the carbon emission of the power plant, realizes the reasonable matching of the optimal traditional energy and the renewable energy, and can be widely applied to the reformation of the thermal power plant.
Description
Technical Field
The utility model relates to a light and heat-retaining technique especially relates to an embedded thermal power emission reduction system of light and heat-retaining.
Background
In recent years, with the development of economy and the improvement of quality of life, energy and environmental issues have been receiving increasing social attention. To cope with these problems, the world has been increasingly using fossil fuels as a main energy source to renewable energy sources such as solar energy and wind energy.
So far, the main power stations in the world still mainly generate electricity by using coal, and the proportion of renewable energy sources such as solar energy, wind energy and the like in the generated energy is gradually increased. With the improvement of the access proportion of the generated energy of the renewable energy sources, the impact of the renewable energy sources on the stability and the safety of a power grid is more obvious.
As the only, non-water and renewable adjusting power supply, the solar thermal power generation (or called as photo-thermal power generation) technology can realize stable and adjustable power generation due to the arrangement of a heat storage system, and has the functions of peak regulation and frequency modulation. At present, the photo-thermal power generation cost is high, and the profitability of a power station is weak. In order to reduce the initial investment of a photo-thermal power generation project and improve the photoelectric conversion efficiency, the solar heat collection field and the heat storage system are combined with the coal-fired power station, so that equipment such as a power generation system and the like can be omitted, and the grade of solar heat can be improved.
For example, the invention with the application number of CN20120543440.2 provides a heat utilization system and a method for realizing the combination of a solar photothermal technology and a thermal power plant, the system adopts a solar thermal collector to collect solar energy to generate medium-high temperature heat energy, the medium-high temperature heat energy is used as a driving heat source of an absorption heat pump to extract the waste heat of circulating water of a condenser, and low-heating steam of a steam turbine is replaced to be used as a heating heat source of low-heating condensed water. The invention patent with the application number of CN20180954230.X provides a secondary reheating type solar energy and coal-fired power station complementary power generation system, steam generated by a solar heat collection field secondarily heats part of steam used by a power system, the system is not provided with a low-cost and high-efficiency heat storage system, only has a secondary heating function, and has the problem that the heat supplied by the solar heat collection field is seriously unstable, so that the control system is complicated. At present, a fused salt heat storage system in the photo-thermal field is expensive, high in stability maintaining cost (high in fused salt melting point), and not suitable for large-scale application in a coal-fired power plant, and the commercial use is not mature.
In view of this, it is necessary to provide a system combining solar light-gathering and heat-collecting and solid heat-storage technologies with a coal-fired power plant under the condition of controllable investment, so as to reduce the coal consumption and carbon emission of the power plant, improve the power generation efficiency of a steam turbine generator, and realize the optimal reasonable matching of the traditional energy and the renewable energy.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an embedded thermoelectricity emission reduction system of light and heat-retaining, the light and heat-retaining device of this system can provide high pressure feed water heater and/or low pressure feed water heater and/or the required heat source of oxygen-eliminating device for traditional thermoelectricity station to reduce or cut off the steam turbine and take out steam, reduce thermal power's degree electricity coal consumption (g kWh), reduce carbon emission by a wide margin, the flexibility of doing extensive application in thermoelectricity station is reformed transform.
The utility model provides an embedded thermoelectricity emission reduction system of light and heat-retaining, include: boiler and steam turbine power generation system who has multistage extraction of steam, its characterized in that, including solar energy spotlight heat collector and/or solid heat accumulation body, the steam that solar energy spotlight heat collector and/or solid heat accumulation body produced gets into steam turbine power generation system's high pressure heater and/or low pressure heater and/or oxygen-eliminating device carry out the heat transfer to as heating heat source heating steam turbine condensation return water, the comdenstion water after the heat transfer gets back again get into next circulation in solar energy spotlight heat collector and/or the solid heat accumulation body.
Furthermore, steam generated by the solar concentrating collector and/or the solid heat storage body enters one or more stages of a high-pressure heater and/or a low-pressure heater of the steam turbine power generation system for heat exchange, can be used together with the original steam turbine extraction steam, and provides a heat source for the high-pressure heater and/or the low-pressure heater of the steam turbine power generation system.
Furthermore, steam output by an outlet of the solar concentrating collector enters the solid heat storage body to store heat, a heat storage outlet of the solid heat storage body is connected with an inlet of the solar concentrating collector to convey water/steam after heat exchange and cooling, and the water/steam after heat exchange and cooling returns to the inlet of the solar concentrating collector again to perform next heat collection and heat storage circulation.
Further, steam is output from a heat taking outlet of the solid heat storage body and enters the high-pressure heater and/or the low-pressure heater for heat exchange, and condensed water after heat exchange enters the solid heat storage body again and enters the next heat taking cycle.
Preferably, the solid heat storage body is a high-temperature-resistant concrete heat storage body.
Preferably, the heat taking working medium in the solid heat storage body is water/steam.
Furthermore, a deaerator is arranged in a heat exchange system formed by water/steam and used for deaerating a water/steam system in the system, so that the safe and stable operation of the system is ensured.
Further, the solar concentrating collector is a Fresnel concentrating collector, a trough concentrating collector or a tower concentrating collector.
Preferably, the heat transfer working medium in the solar concentrating collector is water/steam, heat transfer oil or molten salt, and can be selected according to different requirements.
The utility model has the advantages as follows:
the utility model provides an embedded thermoelectricity emission reduction system of light and heat-retaining, in this system, light focusing heat collector and/or solid heat-retaining body combine to provide the part heat for the driving system of thermoelectricity station is stable together, and wherein the raw and other materials of the solid heat-retaining body mainly are cement, grit etc. and the source is extensive, and is with low costs, can make solar heating system more stable, reduces because the control complexity that the addition of new system leads to. In conclusion, the solar energy light-gathering heat collector and/or the solid heat storage body are/is added, so that the power consumption and the coal consumption of the thermal power station are greatly reduced, and the excellent effect of reducing the carbon emission by 10-25% is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a schematic structural diagram of an embedded thermal power emission reduction system (replacing a high-pressure heater) with photo-thermal heat storage;
FIG. 2 shows a schematic structural diagram of another photothermal heat storage embedded thermal power emission reduction system (replacing a high-pressure heater and a low-pressure heater);
FIG. 3 shows a schematic structural diagram of another photothermal heat storage embedded thermal power emission reduction system (replacing 2 stages of a high-pressure heater)
In the figure, 1 is a boiler, 2 is a steam turbine, 3 is a generator, 4 is a condenser, 5 is a first deaerator, 6 is a second deaerator, 7 is a solid heat storage body, 8 is a solar concentrating collector, 9 is a high-pressure heater, 91 is a first-stage high-pressure heater, 92 is a second-stage high-pressure heater, 93 is a third-stage high-pressure heater, 10 is a low-pressure heater, 21 is a high-pressure cylinder, 22 is an intermediate-pressure cylinder, and 23 is a low-pressure cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example one
As shown in fig. 1, a schematic structural diagram of an embedded thermal power emission reduction system with photo-thermal heat storage (instead of a high-pressure heater) includes: boiler 1 and the turbo generator system that has multistage extraction of steam, turbo generator system includes steam turbine 2, generator 3, condenser 4, first oxygen-eliminating device 5, high pressure feed water heater 9 and low pressure feed water heater 10, its characterized in that, including solar energy spotlight heat collector 8 and/or solid heat storage body 7. The solar concentrating collector 8 is a Fresnel concentrating collector, a trough concentrating collector or a tower concentrating collector, preferably a Fresnel concentrating collector. The heat transfer working medium of the solar concentrating collector 8 is water, heat transfer oil or molten salt. The solid heat storage body is preferably a high-temperature-resistant concrete heat storage body, the high-temperature-resistant concrete heat storage body comprises a concrete heat storage medium and a heat exchange pipeline, the concrete heat storage medium mainly comprises concrete, gravel and the like as raw materials, the cost is low, and the cost of the solid heat storage body 7 is 50% or more lower than that of a molten salt heat storage body, so that the solid heat storage body is very suitable for large-scale commercial utilization. The heat taking working medium of the solid heat storage body 7 is water. Be provided with the oxygen-eliminating device among the heat transfer system that water/vapor formed, specifically, the heat transfer medium in this embodiment is water/steam with heat-taking medium, consequently be provided with second oxygen-eliminating device 6 before solid heat storage body 7, carry out the deoxidization for the system to guarantee the normal steady operation of system, prolong the life of pipeline.
In this embodiment, the solid heat storage body 7 provides a heat source for the high-pressure heater 9, and the connection relationship between the devices is as follows:
when including solar energy spotlight heat collector 8 and solid heat storage body 7 in this embodiment, the steam of 8 export outputs of solar energy spotlight heat collector gets into carry out heat storage in the solid heat storage body 7, the heat-retaining export of the solid heat storage body 7 with 8 entry of solar energy spotlight heat collector links to each other, carries the water vapor after the heat transfer cooling, and the water vapor after the heat transfer cooling of being convenient for gets back again get into next thermal-arrest heat-retaining circulation in the solar energy spotlight heat collector 8. Steam is output from a heat taking outlet of the solid heat storage body 7 and enters the high-pressure heater 9 for heat exchange, and condensed water after heat exchange enters the solid heat storage body 7 again to enter the next heat taking cycle.
The principle of operation of this embodiment is as follows:
the heat storage process: solar energy spotlight heat collector 8 carries out the thermal-arrest through assembling the sunlight, and the steam that solar energy spotlight heat collector 8 produced flows through solid heat storage body 7 carries out the heat transfer, solid heat storage body 7 stores the heat in the heat-storage medium of solid heat storage body 7, the refrigerated water vapor reenters behind the heat transfer carry out the thermal-arrest heat-retaining circulation of next time in the solar energy spotlight heat collector 8.
The heat extraction process comprises the following steps: give in cutting off former thermal power station the steam extraction of high pressure feed water heater 6 gets into the bottom of solid heat storage body 7 gets heat, get the thermal medium through with heat up behind the heat transfer of solid heat storage body 7, form saturated steam/superheated steam, saturated steam/superheated steam after getting heat gets into provide heat in the high pressure feed water heater 9, with the flow through in the power system of thermal power station the heat turbine condensation return water in the high pressure feed water heater 9 heats, and the comdenstion water process after the heat transfer cooling gets back again behind the 6 deoxidations of second oxygen-eliminating device in the solid heat storage body 7 get into next heat cycle.
It should be noted that, include in this embodiment solar energy spotlight heat collector 8 with solid heat storage body 7, when the in-service use, can cancel solid heat storage body 7's setting, promptly the steam of 8 outputs of solar energy spotlight heat collector does not pass through the storage, directly does high pressure heater 9 carries out the provision of heat source, and heat transfer medium after the heat transfer gets back again circulate among the solar energy spotlight heat collector 8. Due to uncertainty of solar energy, extraction steam of a central steam turbine in the system is not cut off, and the extraction steam quantity needs to be adjusted according to the steam quantity generated by the solar concentrating collector 8, and the extraction steam of the steam turbine and the steam generated by the solar concentrating collector 8 are matched with each other to provide a heat source required by normal operation for the high-pressure heater 9.
Example two
As shown in fig. 2, another structure schematic diagram of an embedded thermal power emission reduction system with photo-thermal heat storage (instead of a high-pressure heater and a low-pressure heater) with a thermal power plant is shown, and the solid heat storage body 7 provides a required heat source for the low-pressure heater 10 and the high-pressure heater 9 in a power system of an original thermal power plant.
The heat storage process in this embodiment is the same as the first embodiment, and is not described here again, and the heat extraction process is as follows:
a heat taking working medium enters from the bottom end of the solid heat storage body 7 to carry out heat taking and heat exchanging, saturated steam/superheated steam is output after temperature rising, the saturated steam/superheated steam after heat taking is divided into two paths, the first path is connected with an inlet of the low-pressure heater 10 to provide a heat source required by heat exchanging for the low-pressure heater 10, and water cooled after heat exchanging enters the second deaerator 6; the second path is connected with the high-pressure heater 9 to provide heat exchange heat for the high-pressure heater 9, and the water/steam cooled after heat exchange enters the solid heat storage body 7 again to perform the next heat taking cycle.
In a similar way, through right the different design and the control of 7 output end positions of solid heat storage body, solid heat storage body 7 can provide the required parameter heat source of operation for one or more devices among low pressure feed water heater, the high pressure feed water heater among the thermal power station driving system, no longer gives unnecessary details in this application, but above-mentioned embodiment all falls into the utility model discloses a within the protection scope.
EXAMPLE III
As shown in fig. 3, another structure schematic diagram of an embedded thermal power emission reduction system with photo-thermal heat storage (instead of 2-stage high-pressure heaters) with a solid heat storage body 7 provides all or part of required heat sources for a second-stage high-pressure heater 92 and a 3 rd-stage high-pressure heater 93 in a high-pressure heater 9 in a power system of a primary thermal power station.
The heat storage process in this embodiment is the same as the first embodiment, and is not described here again, and the heat extraction process is as follows:
the steam turbine that does not cut off original high pressure feed water heater draws steam, gets hot working medium and follows 7 bottoms of solid heat accumulation body get into and get hot heat transfer, and after the intensification, output saturated steam/superheated steam, saturated steam/superheated steam after getting hot divide into two the tunnel, first the tunnel with second level high pressure feed water heater 92 entry links to each other, the second tunnel with second level high pressure feed water heater 92 entry links to each other, does respectively second level high pressure feed water heater 92 and 3 rd level high pressure feed water heater 93 provide the required whole or heat source of heat transfer, and former steam turbine draws steam for first level high pressure feed water heater 91 provides the required whole heat source of heat transfer, is in simultaneously the heat that solid heat accumulation body 7 provided is not satisfied during the whole heat sources of second level high pressure feed water heater 92 and 3 rd level high pressure feed water heater 93. Cooling water after heat exchange of the second-stage high-pressure heater 92 and the 3 rd-stage high-pressure heater 93 enters the second deaerator 6 for deaerating, and then returns to the solid heat storage body 7 again for next heat extraction cycle; and cooling water subjected to heat exchange by the first-stage high-pressure heater 91 enters the first deaerator 5 to be mixed with condensate water of the original turbine, and enters the high-pressure heater 9 again to be heated and circulated.
It should be noted that, in this embodiment, only the heat source required for heat exchange is provided for the two-stage steam extraction of the high-pressure heater as an example, in actual implementation, the heat source required for heat exchange may be provided for any one stage or multiple stages of the high-pressure heater and the low-pressure heater, and may be combined at will, and the above embodiments all fall within the protection scope of this embodiment.
To sum up, the utility model discloses well light and heat-retaining system only carries out thermal supply to these two kinds of heat demand equipment of high pressure feed water heater and low pressure feed water heater, and among the practical application process, light and heat-retaining system still can carry out thermal supply for other in the power system among the former thermal power station with the thermal equipment, like oxygen-eliminating device, low pressure jar etc. above each embodiment and arbitrary combination all fall into the protection scope of this embodiment.
The embodiment has low comprehensive cost, reduces or cuts off the extraction steam of each stage of the steam turbine in the power system of the original thermal power station, improves the steam quality entering the steam turbine and increases the power generation efficiency of the steam turbine generator; in addition, the heat of the original extracted steam is provided by a solar heat collection and storage system, the energy source is solar energy, the energy is inexhaustible, the energy is green and environment-friendly, the coal consumption and the carbon emission of the original thermal power station can be reduced by 10-25%, and the method can be widely applied to the transformation of the thermal power station.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (9)
1. An embedded thermal power emission reduction system of light and heat storage includes: boiler and steam turbine power generation system who has multistage extraction of steam, its characterized in that, including solar energy spotlight heat collector and/or solid heat accumulation body, the steam that solar energy spotlight heat collector and/or solid heat accumulation body produced gets into steam turbine power generation system's high pressure heater and/or low pressure heater and/or oxygen-eliminating device carry out the heat transfer to as heating heat source heating steam turbine condensation return water, the comdenstion water after the heat transfer gets back again get into next circulation in solar energy spotlight heat collector and/or the solid heat accumulation body.
2. The embedded thermal power emission reduction system according to claim 1, wherein steam generated by the solar concentrating collector and/or the solid heat storage body enters one or more stages of a high-pressure heater and/or a low-pressure heater of the steam turbine power generation system to exchange heat.
3. The embedded thermal power emission reduction system according to claim 1, wherein steam output from the outlet of the solar concentrating collector enters the solid heat storage body for heat storage, and the heat storage outlet of the solid heat storage body is connected with the inlet of the solar concentrating collector to deliver water/steam after heat exchange and cooling.
4. The embedded thermal power emission reduction system of claim 3, wherein steam is output from a heat extraction outlet of the solid heat storage body and enters the high-pressure heater and/or the low-pressure heater for heat exchange, and condensed water after heat exchange enters the solid heat storage body again and enters the next heat extraction cycle.
5. The embedded thermal power emission reduction system of claim 1, wherein the solid heat storage body is a high temperature resistant concrete heat storage body.
6. The embedded thermal power emission reduction system of claim 5, wherein the heat extraction working medium in the solid heat storage body is water/steam.
7. The embedded photothermal thermal storage thermal power emission reduction system according to claim 6, wherein a deaerator is arranged in the water/steam formed heat exchange system.
8. The embedded photothermal heat storage thermal power emission reduction system according to claim 1, wherein the solar concentrating collector is a fresnel type concentrating collector, a trough type concentrating collector or a tower type concentrating collector.
9. The embedded photothermal heat storage thermal power emission reduction system according to claim 8, wherein the heat transfer working medium in the solar concentrating collector is water/water vapor, heat transfer oil or molten salt.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837763A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power generating unit flexible regulation and control system integrated with steam accumulator and working method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837763A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power generating unit flexible regulation and control system integrated with steam accumulator and working method |
| CN114837763B (en) * | 2022-05-27 | 2023-05-05 | 华能国际电力股份有限公司 | Flexible regulation and control system of thermal power unit integrated with steam accumulator and working method |
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