CN218953390U - Wind-solar-storage renewable steam turbine cogeneration system - Google Patents
Wind-solar-storage renewable steam turbine cogeneration system Download PDFInfo
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Abstract
The utility model discloses a wind-solar-storage renewable turbine cogeneration system which comprises a wind-solar power generation system, a thermoelectric energy storage system and a turbine cogeneration system. The wind-solar energy storage system comprises photovoltaic power generation and wind power generation, the low-voltage power grid is connected through a transformer, and the thermoelectric energy storage system comprises an electric heating temperature controller and an energy storage distribution controller and is used for regulating and controlling the input electric quantity of the electric storage device in real time. The electric heating chemical chain/molten salt heat storage system is connected with a low-voltage power grid, an energy input control strategy is implemented through an electric heating temperature controller, and heated working media enter the steam turbine cogeneration system to realize storage input and output of electric energy and heat energy. The whole system realizes the high-efficiency heat storage decoupling of the electric heating chemical chain/molten salt heat storage tank by coupling the wind-solar electricity storage and the high-low voltage power grid system and adopting an automatic regulation technology, realizes the overall coordinated control of wind-solar electricity storage, heat storage and cogeneration, and has remarkable economic benefit, social benefit and engineering application prospect.
Description
Technical field:
the utility model relates to the technical field of wind-solar power generation and energy storage, in particular to a wind-solar-storage renewable steam turbine cogeneration system.
The background technology is as follows:
as the world population continues to grow and the economy continues to grow, so does the demand for energy supplies. In addition, current energy consumption structures rely primarily on fossil fuels such as coal, oil, and gas. The annual average growth rate of global primary energy consumption in the past 10 years is 1.9% as indicated by the "BP world energy statistics annual authentication" 2016 issued in 6 of 2016. The global primary energy consumption increases by 1.0% in 2015, the primary energy consumption in China increases by 1.5%, and the primary energy consumption in the world is kept for 15 years continuously. And it is predicted that in the future, most fossil fuels will be consumed continuously, carbon dioxide emissions will be increased, and reducing greenhouse gases is a serious challenge. In order to face the situation, the energy consumption structure must be adjusted gradually, the renewable energy sources such as wind energy, solar energy, tidal energy, geothermal energy and the like are developed with great force, a sustainable development road is provided in the aspect of energy application, and the continuous forward of economy, ecological health and human society is ensured.
Since 1980 you have first proposed the concept of wind-solar complementary power generation, so far, a great deal of research has been conducted on various novel energy systems at home and abroad, related partial technological achievements have matured, and the main research directions are grid-connected power generation and independent wind power generation. So far, little research has been done on grid connection of small power grids. Although foreign scholars further develop and obtain great research results on wind-solar combined transportation power generation systems, wind power and energy storage power station combined transportation systems and photovoltaic power generation and energy storage power station combined transportation systems, the research on small and medium-sized energy storage and heat and power combined transportation systems is less, and the optimization design of the whole system also lacks mature theoretical and engineering practice support. How to reasonably and effectively utilize distributed wind-light power generation and energy storage is an important problem to be solved at present.
The chemical chain/molten salt heat storage technology stores and releases heat energy through reversible chemical reaction, the heat storage density is far higher than that of sensible heat storage and phase change heat storage, the long-term storage of the heat energy can be almost free of heat loss, and the cold and hot composite storage can be realized, so that the technology has wide application prospects in the aspects of waste heat/waste heat recovery, wind and solar complementary utilization and the like. However, the prior art has few technical schemes for utilizing chemical chain/molten salt heat storage technology in waste heat/waste heat recovery and wind-solar complementary utilization.
The utility model comprises the following steps:
the utility model aims to provide a wind-solar-storage renewable steam turbine cogeneration system so as to solve the defects in the prior art.
The utility model is implemented by the following technical scheme: the system comprises a wind-solar power generation system, a thermoelectric energy storage system and a turbine cogeneration system; the wind-solar power generation system comprises a photovoltaic power generation module, a first DC/AC conversion module, a wind power generation module and a second DC/AC conversion module, wherein an outlet a of the first DC/AC conversion module and an outlet b of the second DC/AC conversion module are respectively connected with a first transformer and a second transformer, the first transformer and the second transformer are connected to a high-voltage power grid through a low-voltage power grid and a third transformer in sequence, or the first transformer and the second transformer are connected to the low-voltage power grid through the high-voltage power grid and the third transformer in sequence;
the thermoelectric energy storage system comprises an electric storage device, a total current input signal module and an electric heating chemical chain/molten salt heat storage tank, the low-voltage power grid is also connected with an electric heating temperature controller, the output end d of the electric heating temperature controller is connected with heating current and is connected to the electric heating chemical chain/molten salt heat storage tank, the electric heating temperature controller is connected with an energy storage distribution controller to jointly form an electric power regulation and control system, the input end of the energy storage distribution controller is connected with the total current input signal module and the electric heating temperature controller, the output end of the energy storage distribution controller is connected with a third DC/AC conversion module, and two ends of the third DC/AC conversion module are respectively connected with the low-voltage power grid and the electric storage device;
the steam turbine cogeneration system comprises a back-pumping steam turbine, wherein a water supply outlet f of an electric heating chemical chain/molten salt heat storage tank is connected with a back-pumping steam turbine inlet g and a bypass valve inlet, an outlet of the bypass valve is connected with an inlet l of a I-stage temperature and pressure reducer, an outlet m of the I-stage temperature and pressure reducer is connected with a first temperature reducer outlet, and the outlet m of the I-stage temperature and pressure reducer is connected with a high-pressure industrial steam supply network inlet p through a first regulating valve;
the first steam extraction port j of the back extraction turbine is connected with a first desuperheater, the second steam extraction port k of the back extraction turbine is connected with a second desuperheater, the outlet of the first desuperheater is connected with the inlet p of the high-pressure industrial steam supply network through a first regulating valve, the outlet of the second desuperheater is connected with the inlet q of the low-pressure industrial steam supply network through a second regulating valve, and the outlet of the second desuperheater is also connected with the inlet r of the heating head station through a third regulating valve.
The device is characterized in that the I-stage temperature and pressure reducer outlet m is further connected with the II-stage temperature and pressure reducer inlet n, the II-stage temperature and pressure reducer outlet o is converged with the second attemperator outlet and is connected with a heating head station inlet r through a third regulating valve, the heating head station outlet s is connected with a drain pump inlet, the drain pump outlet is connected with a deaerator inlet h, the deaerator is connected with a water supplementing pipeline, the deaerator main steam inlet u is further connected with a back-pumping turbine backpressure outlet t, the deaerator drain outlet I is connected with a variable-frequency booster pump input end, the output end of the variable-frequency booster pump is connected with a high-pressure heater, the high-pressure heater heating inlet I is connected with a first steam extraction port j of the back-pumping turbine, and the high-pressure heater outlet is connected with an electric heating inlet e of a chemical chain/molten salt heat storage tank.
Furthermore, the low-voltage power grid is also connected with a fourth transformer, the fourth transformer is connected with a generator, and the generator is a back-pumping steam turbine.
Furthermore, the electrothermal chemical chain/molten salt heat storage tank is formed by connecting a plurality of electrothermal chemical chain/molten salt heat storage tanks in parallel, and a main electric heater and an output electric heater are arranged in the electrothermal chemical chain/molten salt heat storage tank.
Furthermore, the back extraction type steam turbine is a single adjustable back extraction type steam turbine, or a plurality of back extraction machines are connected in series and combined into a steam turbine unit array.
Furthermore, the electricity storage device and the total current input signal module are formed by a chemical battery, a super capacitor battery or flywheel energy storage alone or in a mixed mode.
The utility model has the advantages that:
according to the utility model, decoupling control of the whole system is realized by adopting a mode of combining wind-solar energy storage and thermoelectric regulation and control and combining an electrothermal chemical chain/molten salt heat storage tank. The device generates electricity by photovoltaic power, wind power and steam turbine, and the electricity storage device and the heat storage device are connected in a low-voltage power network and are connected with a high-voltage power network through a transformer, and the heat storage device and the electricity storage device are connected with each otherThe required electric energy is generated by photovoltaic power generation and wind power generation of a low-voltage power grid. The energy storage distribution controller is used for receiving a current signal I corresponding to the current storable energy Total (S) Current signal I corresponding to the electrical energy consumed by the heat storage device Heat storage Outputting a current signal I which can be used for electricity storage Power storage To the electricity storage device (namely, the distribution of the stored energy current is completed). The electrothermal chemical chain/molten salt heat storage device is controlled by an electric heating temperature controller, and the outputted high-temperature and high-pressure steam enters a steam turbine array formed by serial and parallel connection of a back-pumping steam turbine or a plurality of back-pressing machines, so as to drive a generator to generate electricity and output the steam with different parameters. The electric heating temperature controller controls the heat storage device to generate high-temperature high-pressure steam according to the heat supply requirement, and simultaneously outputs current consumed by electric heating to the energy storage distribution controller. The whole system has good decoupling performance and has good theoretical research and engineering practical significance.
Description of the drawings:
in order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a heat storage device and an electrothermal chemical chain/molten salt heat storage tank according to an embodiment of the present utility model powered by a power grid;
fig. 2 is a schematic diagram of a heat storage device and an electrothermal chemical chain/molten salt heat storage tank energy supply structure through a high-voltage power grid according to an embodiment of the utility model.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the wind-solar-storage renewable turbine cogeneration system comprises a wind-solar power generation system, a thermoelectric energy storage system and a turbine cogeneration system; the wind-solar power generation system comprises a photovoltaic power generation module 1, a first DC/AC conversion module 3, a wind power generation module 2 and a second DC/AC conversion module 4, wherein an outlet a of the first DC/AC conversion module 3 and an outlet b of the second DC/AC conversion module 4 are respectively connected with a first transformer 5 and a second transformer 6, and the first transformer 5 and the second transformer 6 are connected to a high-voltage power grid 15 through a power grid 13 and a third transformer 14 in sequence, as shown in fig. 1; or the first transformer 5 and the second transformer 6 are connected to the electric power grid 13 via a high voltage power grid 15, a third transformer 14 in sequence, as shown in fig. 2. The thermoelectric energy storage system comprises an electric storage device 9, a total current input signal module 10 and an electrothermal chemical chain/molten salt heat storage tank 16, wherein a low-voltage power grid 13 is connected with an electric heating temperature controller 12, and the electric heating temperature controller 12 controls the heating current of the heat storage device according to a given heat storage control signal of the thermoelectric chemical chain heat storage module and an actual temperature feedback signal T of output steam and can simultaneously send a real-time signal of the heating current to an energy storage distributor. The electrothermal chemical chain/molten salt heat storage tank 16 is internally provided with a main electric heater 16-A and an output electric heater 16-B, which respectively heat the heat storage medium in the heat storage tank and the water and steam of the output section. Thus, when the heat storage tank outputs steam, the water and steam of the output section may be heated by the heat storage medium and the output electric heater separately or simultaneously.
The output heating current of the outlet d of the electric heating temperature controller 12 is connected with an electric heating chemical chain/molten salt heat storage tank 16, the electric heating temperature controller 12 is connected with an energy storage distribution controller 11 to jointly form an electric power regulation and control system, and the energy storage distribution controller 11 (which can be a single-chip microcomputer or an ARM processor) receives the current heating current real-time signal from the electric heating temperature controller and the allowed total energy storage current and outputs an electric storage current control signal (namely, the energy storage current distribution is completed). The input end of the energy storage distribution controller 11 is connected with the total current input signal module 10, the output end of the energy storage distribution controller 11 is connected with the third DC/AC conversion module 8, and two ends of the third DC/AC conversion module 8 are respectively connected withA low-voltage power grid 13 and a power storage device 9 are connected; by receiving a total current input signal module 10 corresponding to the currently storable electric energy and a current signal I corresponding to the electric energy consumed by the heat storage device (electrothermal chemical chain/molten salt heat storage tank 16) Heat storage Obtaining a current signal I currently available for electricity storage through operation Power storage And the current corresponding to the signal is led into the electricity storage device to store the electric energy. Wherein, the liquid crystal display device comprises a liquid crystal display device,
I power storage ＝I Total (S) -I Heat storage 。
The steam turbine cogeneration system comprises a back-pumping steam turbine 17, a water supply outlet f of an electric heating chemical chain/molten salt heat storage tank 16 is connected with an inlet g of the back-pumping steam turbine 17 and an inlet of a bypass valve 23, an outlet of the bypass valve 23 is connected with an inlet l of a I-stage temperature and pressure reducer 24, an outlet m of the I-stage temperature and pressure reducer 24 is connected with an outlet of a first attemperator 26, and the outlet m of the I-stage temperature and pressure reducer is connected with an inlet p of a high-pressure industrial steam supply network 31 through a first regulating valve 28; the primary steam extraction port j of the back extraction turbine 17 is connected with a first attemperator 26, the secondary steam extraction port k of the back extraction turbine 17 is connected with a second attemperator 27, the outlet of the first attemperator 26 is connected with the inlet p of a high-pressure industrial steam supply network 31 through a first regulating valve 28, the outlet of the second attemperator 27 is connected with the inlet q of a low-pressure industrial steam supply network 32 through a second regulating valve 29, and the outlet of the second attemperator 27 is also connected with the inlet r of a heating head station 33 through a third regulating valve 30. In this embodiment, the heating head station is a heat exchange device, and transfers the heat of the working medium flowing in from the inlet r to the external hot water circulation.
The outlet m of the I-stage temperature and pressure reducer 24 is also connected with the inlet n of the II-stage temperature and pressure reducer 25, the outlet o of the II-stage temperature and pressure reducer 25 is converged with the outlet of the second attemperator 27 and is connected with the inlet r of the heating head station 33 through the third regulating valve 30, the outlet s of the heating head station 33 is connected with the inlet of the drain pump 34, the outlet of the drain pump 34 is connected with the inlet h of the deaerator 18, the deaerator 18 is connected with a water supplementing pipeline in addition to the main steam inlet u of the deaerator 18, the main steam inlet u of the deaerator 18 is also connected with the back pressure outlet t of the back pressure extraction turbine 17, the drain outlet I of the deaerator 18 is connected with the input end of the variable-frequency booster pump 19, the output end of the variable-frequency booster pump 19 is connected with the high-pressure heater 20, the heating inlet I of the high-pressure heater 20 is connected with the first steam outlet j of the back pressure extraction turbine 17, and the outlet of the high-pressure heater 20 is connected with the inlet e of the electric heating tank 16 of the chemical chain/molten salt heat storage tank 16.
In this embodiment, the low-voltage power grid 13 is further connected to a fourth transformer 22, the fourth transformer 22 is connected to a generator 21, and the generator 21 is coupled to the back-pumping turbine 17.
In this embodiment, the power storage device 9 is connected to the DC/AC converter 8, and absorbs system power from the control of the electric heating thermostat 12 at low load. The wind-solar hybrid power system can also release electric energy under high load, the high-voltage power grid 15 is utilized, the wind-solar hybrid power system has a bidirectional input and output function, and the outlet a of the first DC/AC conversion module 3 and the outlet b of the second DC/AC conversion module 4 of the wind-solar hybrid power system are both unidirectional outputs.
In the present embodiment, the electric heating thermostat 12 is used to control the heat storage device (electrothermal chemical chain/molten salt heat storage tank 16) to generate high-temperature and high-pressure steam according to the heat supply demand, and simultaneously output the electric current consumed by electric heating to the energy storage distribution controller 11.
In the present embodiment, the electrothermal chemical chain/molten salt heat storage tank 16 is composed of an electric heating electric boiler, chemical chain/molten salt heat storage, water heating evaporation, and the like. Taking chemical chain heat storage as an example, when in heat storage, the device is connected with an electric boiler to heat a heat storage medium, and the heat storage medium is subjected to chemical reaction to store chemical energy and sensible heat; when releasing heat, the device is filled with high-pressure water, and the water is heated by the heat storage medium and can be electrically heated to become steam for output. The device is controlled by an electric heating temperature controller 12, and the outputted high-temperature high-pressure steam enters a steam turbine array formed by serial and parallel connection of a back extraction steam turbine 17 or a plurality of back pressure machines, drives a generator 21 to generate electricity, and outputs the steam with different parameters. In addition, the heat storage device can also be formed by connecting a plurality of electrothermal chemical chains/molten salt heat storage tanks in parallel.
In this embodiment, the back extraction turbine 17 may be a single adjustable back extraction turbine, or may be an array of multiple back-pressure machines combined in series and parallel.
In this embodiment, the power storage device 9 and the total current input signal module 10 may be composed of a chemical battery such as a lithium battery, a sodium battery, etc., or a super capacitor battery such as a nano carbon battery, etc., or a flywheel energy storage, etc., alone or in combination. When the electricity storage current signal I Power storage When the power is "+", the power is stored, when I Power storage Discharging when being "-".
In the present embodiment, the energy storage distribution controller 11 is configured to receive a current signal I corresponding to the currently storable energy Total (S) Current signal I corresponding to the electrical energy consumed by the heat storage device Heat storage Outputting a current signal I which can be used for electricity storage Power storage To the electricity storage device.
In the present embodiment, the photovoltaic power generation module 1, the wind power generation module 2, the generator 21, the power storage device 9 and the electrothermal chemical chain/molten salt heat storage tank 16 are all connected in the electric power grid 13 and are connected with the high-voltage electric power grid 15 through the third transformer 14, and the electric power required by the power storage device 9 and the electrothermal chemical chain/molten salt heat storage tank 16 is all from the photovoltaic power generation system and the wind power generation system of the low-voltage electric power grid 13. In addition to this, the electrical energy required by the heat storage means 9 and the electrothermal chemical chain/molten salt heat storage tank 16 can also be obtained from the high voltage grid, i.e. the output of photovoltaic and wind power generation can also be directly to the high voltage grid.
According to the utility model, decoupling control of the whole system is realized by adopting a mode of combining wind-solar energy storage and thermoelectric regulation and control and combining an electrothermal chemical chain/molten salt heat storage tank. The device photovoltaic power generation, wind power generation, turbine unit power generation, the power storage device and the heat storage device are all connected in a low-voltage power grid and connected with a high-voltage power grid through a transformer, and the electric energy required by the heat storage device and the power storage device is from the photovoltaic power generation and the wind power generation of the low-voltage power grid. The energy storage distribution controller is used for receiving a current signal I corresponding to the current storable electric energy and storing heat corresponding to the electric energy consumed by the heat storage device, and outputting the current signal I currently available for storing the electric energy to the electric energy storage device. The electrothermal chemical chain/molten salt heat storage device is controlled by an electric heating temperature controller, and the outputted high-temperature and high-pressure steam enters a steam turbine array formed by serial and parallel connection of a back-pumping steam turbine or a plurality of back-pressing machines, so as to drive a generator to generate electricity and output the steam with different parameters. The electric heating temperature controller controls the heat storage device to generate high-temperature high-pressure steam according to the heat supply requirement, and simultaneously outputs current consumed by electric heating to the energy storage distribution controller. The whole system has good decoupling performance and has good theoretical research and engineering practical significance.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The wind-solar-storage renewable steam turbine cogeneration system is characterized by comprising a wind-solar power generation system, a thermoelectric energy storage system and a steam turbine cogeneration system; the wind-solar power generation system comprises a photovoltaic power generation module (1) and a first DC/AC conversion module (3), and a wind power generation module (2) and a second DC/AC conversion module (4), wherein an outlet a of the first DC/AC conversion module (3) and an outlet b of the second DC/AC conversion module (4) are respectively connected with a first transformer (5) and a second transformer (6), the first transformer (5) and the second transformer (6) are sequentially connected to a high-voltage power grid (15) through a power grid (13) and a third transformer (14), or the first transformer (5) and the second transformer (6) are sequentially connected to the high-voltage power grid (13) through the power grid (15) and the third transformer (14);
the thermoelectric energy storage system comprises an electric storage device (9), a total current input signal module (10) and an electric heating chemical chain/molten salt heat storage tank (16), wherein an electric heating temperature controller (12) is connected with an electric power grid (13), heating current output by an outlet d of the electric heating temperature controller (12) is connected with the electric heating chemical chain/molten salt heat storage tank (16), the electric heating temperature controller (12) is connected with an energy storage distribution controller (11) to jointly form an electric power regulation and control system, the input end of the energy storage distribution controller (11) is respectively connected with the total current input signal module (10) and the electric heating temperature controller (12), the output end of the energy storage distribution controller (11) is connected with a third DC/AC conversion module (8), and two ends of the third DC/AC conversion module (8) are respectively connected with the electric power grid (13) and the electric storage device (9);
the steam turbine cogeneration system comprises a back-pumping steam turbine (17), wherein a water supply outlet f of the electric heating chemical chain/molten salt heat storage tank (16) is connected with an inlet g of the back-pumping steam turbine (17) and an inlet of a bypass valve (23), an outlet of the bypass valve (23) is connected with an inlet l of a I-stage temperature and pressure reducer (24), an outlet m of the I-stage temperature and pressure reducer (24) is connected with an outlet of a first attemperator (26), and the outlet m of the I-stage temperature and pressure reducer is connected with an inlet p of a high-pressure industrial steam supply network (31) through a first regulating valve (28);
the primary steam extraction port j of the back extraction turbine (17) is connected with a first attemperator (26), the secondary steam extraction port k of the back extraction turbine (17) is connected with a second attemperator (27), the outlet of the first attemperator (26) is connected with the inlet p of a high-pressure industrial steam supply network (31) through a first regulating valve (28), the outlet of the second attemperator (27) is connected with the inlet q of a low-pressure industrial steam supply network (32) through a second regulating valve (29), and the outlet of the second attemperator (27) is also connected with the inlet r of a heating head station (33) through a third regulating valve (30);
the utility model provides a heat storage device, including I level desuperheater pressure reducer (24) export m still connects II level desuperheater pressure reducer (25) import n, II level desuperheater pressure reducer (25) export o and second desuperheater (27) export are pooled and are connected heating head (33) import r through third governing valve (30), heating head (33) export s is connected hydrophobic pump (34) entry, hydrophobic pump (34) exit linkage deaerator (18) entry h, deaerator (18) except that connecting the moisturizing pipeline, deaerator (18) main steam entry u still connects back-pumping steam turbine (17) backpressure export t, deaerator (18) hydrophobic export I connects variable frequency booster pump (19) input, variable frequency booster pump (19) output is connected high-pressure heater (20), high-pressure heater (20) heating import I connects back-pumping steam turbine (17) first extraction j, high-pressure heater (20) export connection electrothermal chemical chain/molten salt heat storage tank (16) import e.
2. A cogeneration system for a wind and solar energy storage renewable turbine according to claim 1, wherein the low voltage grid (13) is further connected to a fourth transformer (22), the fourth transformer (22) is connected to a generator (21), and the generator (21) is connected to a back-pumping turbine (17).
3. The cogeneration system of the wind-solar renewable steam turbine according to claim 1, wherein the electrothermal chemical chain/molten salt heat storage tank (16) is formed by connecting a plurality of electrothermal chemical chain/molten salt heat storage tanks in parallel, and a main electric heater and an output electric heater are arranged in the electrothermal chemical chain/molten salt heat storage tank (16).
4. The cogeneration system of a wind-solar renewable steam turbine according to claim 1, wherein the back extraction steam turbine (17) is a single adjustable back extraction steam turbine or a series-parallel combination steam turbine unit array of a plurality of back extraction presses.
5. The wind-solar energy storage renewable steam turbine cogeneration system according to claim 1, wherein the electricity storage device (9) and the total current input signal module (10) are composed of a chemical battery, a super capacitor battery or flywheel energy storage alone or in combination.
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