CN219262468U - Nuclear motor unit decoupling and supplying system based on chemical chain energy storage - Google Patents
Nuclear motor unit decoupling and supplying system based on chemical chain energy storage Download PDFInfo
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- CN219262468U CN219262468U CN202223422983.7U CN202223422983U CN219262468U CN 219262468 U CN219262468 U CN 219262468U CN 202223422983 U CN202223422983 U CN 202223422983U CN 219262468 U CN219262468 U CN 219262468U
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Abstract
The utility model discloses a nuclear motor unit decoupling supply system based on chemical chain energy storage, wherein a nuclear power station is a pressurized water reactor, a loop system is formed by high-pressure water circulation, and saturated steam generated after the interior of a steam generator is heated by a loop is circulated into a nuclear turbine from a two-loop system to generate power. One path of water supply output from the deaerator in the two-loop system enters an electrothermal chemical-link heat storage tank, heat absorption or heat release of the heat storage tank is controlled according to the power requirement of a power grid, steam output from the heat storage tank can be used for power generation of a back-pumping steam turbine or the requirements of factories and industrial steam, the thermoelectric control decoupling or peak shaving function of the whole system can be realized, and the heat storage tank can also be used as a starting boiler of a unit. Aiming at the control characteristics of strong coupling and large inertia of a cogeneration system of a nuclear power unit, the utility model realizes cogeneration of a complex unit by adopting the high-efficiency heat storage decoupling characteristic of the electrothermal chemical-link heat storage tank, and has remarkable economic benefit, social benefit and engineering application prospect.
Description
Technical field:
the utility model relates to the technical field of nuclear power cogeneration and energy storage, in particular to a nuclear generator set decoupling and supplying system based on chemical chain energy storage.
The background technology is as follows:
cogeneration refers to extracting part of heat from a steam turbine or a pipeline of a large nuclear power plant, and is used as a heat source for urban heat supply, wherein the heat is mainly generated by power generation and is assisted by heat supply, and the heat is mainly generated by power generation and is assisted by power generation. By the year of 2016, the urban and rural building heating area in northern areas of China is about 206 hundred million square meters, the heating coal is about 4 hundred million tons of standard coal, and 10.48 hundred million tons of carbon dioxide, 340 ten thousand tons of sulfur dioxide and 296 ten thousand tons of nitrogen oxides are equivalently discharged. The heating coal amount accounts for 27.49% of the coal for coal-electricity generation and 10% of the total social coal amount. Nuclear energy is an important form of clean heating, and nuclear energy heat supply is a safe, simple, mature and reliable technology, and can be successfully applied to urban heat supply in northern areas and popularization and application, so that the problem of haze caused by coal-fired heating can be relieved.
In the 60-70 s of the 20 th century, nuclear heating technology research and development is started internationally, and a nuclear power unit cogeneration mode is mainly adopted to date with a certain scale. Currently, there are about 57 commercial reactors (11.6% of the total) in the world that generate hot water or steam for district heating while generating electricity, mainly distributed in cold eastern europe. The safety and reliability of nuclear energy heating have been verified, so far, application experience of more than 1000 piles per year has been accumulated, and events and accidents related to nuclear safety have not occurred. At present, china is also developing the feasibility study of implementing the cogeneration of nuclear power plants in northern areas.
The traditional unit frequency modulation mainly comprising thermal power units and nuclear power units is mainly characterized by low response speed and low climbing speed, so that the aim of trial scheduling cannot be quickly achieved, the task of rescheduling cannot be quickly responded, and only correction of partial regional control errors can be provided. In addition, the frequency modulation direction of the slower climbing speed cannot be changed rapidly, and even reverse adjustment is caused, so that the regional control error is increased. Meanwhile, the random fluctuation of the large-scale renewable energy power generation treatment of the external environment aggravates the requirement of the system on frequency-adjusting resources. In order to cope with the dilemma that frequency characteristics are deteriorated due to the increasingly reduced frequency modulation resources and insufficient frequency modulation capability of the power grid, the method for searching for a new frequency modulation means has important practical significance.
With the progress of energy storage technology, energy storage peak shaving plays an increasingly important role in power plant peak shaving systems in recent years. By adding the energy storage module in the cogeneration system, the thermal decoupling can be realized, the dimension of the control system is reduced, and the load adjusting range of the unit can be widened on the other hand, so that the system has the effect of achieving two purposes.
The utility model comprises the following steps:
the utility model aims to provide a device for solving the defects in the prior art.
The utility model is implemented by the following technical scheme: a nuclear motor unit decoupling power supply system based on chemical chain energy storage, which is characterized in that: the system comprises a first loop system and a second loop system of the nuclear power station, an electrothermal chemical chain heat storage system, a back-pumping type steam turbine power generation system, a multi-path temperature and pressure reducing steam supply system and an internal power grid system.
Still further, the nuclear power plant-loop system includes a nuclear reactor connected to the steam generator inlet through a loop outlet, the steam generator-loop outlet being connected to the main circulation pump. The steam generator main steam outlet is connected with the inlet of the steam turbine high-pressure cylinder, the outlet of the steam turbine high-pressure cylinder is connected with the inlet of the steam-water separation reheater, the heating side of the steam-water separation reheater is used for heating the steam at the outlet of the high-pressure cylinder by independently extracting steam, and the heated steam forms drainage after being cooled and flows out from the outlet. One path of the heated steam enters the low-pressure cylinder to do work and generate electricity from the three-way regulating valve of the steam extraction, and the other path enters the heating first station.
Further, the outlet of the low-pressure cylinder is connected with a condenser, the outlet of the condenser is sequentially connected with a condensate pump, a low-pressure heater and a deaerator, water is split from the outlet of the deaerator, one path of water sequentially enters the water feeding pump, the high-pressure heater and returns to the steam generator through a water feeding inlet l; the other path enters the electrothermal chemical-looping heat storage tank through the water supply inlet by the variable-frequency booster pump. And the steam after heat release of the heating head station is converged with the water supply of the condensate pump through the drain pump.
Furthermore, the main equipment of the internal power grid system comprises two generators and two transformers, and the electric heating end of the electric heating chemical chain heat storage tank is connected to the internal power grid. The steam output end is split by the small-machine steam inlet valve group, the multi-path steam supply valve group and the auxiliary steam valve in sequence. One path of steam enters the back extraction steam turbine through the inlet of the small-sized steam inlet valve group to perform power generation, and enters the multi-path desuperheater group through the multi-path steam extraction port of the back extraction steam turbine to output steam with different pressures to the industrial steam supply heat supply network. The other steam enters the multi-path pressure reducer group through the multi-path steam supply valve group for gradual pressure reduction, then is divided into multiple paths to be combined with the extracted steam, and then enters the industrial steam supply heat supply network through the multi-path temperature reducer group. The third way, namely, the steam passing through the auxiliary steam valve only enters the temperature and pressure reducer when the unit is started and needs to enter the auxiliary steam header for the plant through the inlet and is supplied to a steam system for the plant such as a deaerator, a shaft seal steam and the like through the outlet. In other words, the electrothermal chemical-looping heat storage tank can be used as a starting boiler of a unit.
And the back extraction steam turbine exhaust outlet is connected with the inlet of the heating first station after being branched and converged by the low-pressure cylinder inlet three-way regulating valve, and flows out from the outlet after heat release, and finally is converged into the main water supply pipeline by the drainage pump.
Further, the internal power grid comprises a first generator, and the first generator is connected with a first transformer and is connected with an external power grid; the internal power grid further comprises a second generator, and the second generator is connected with a second transformer and finally connected with an external power grid through a first transformer.
Furthermore, the electric heating chemical-link heat storage tank is provided with heat storage energy by an electric heating boiler, and the electric heating boiler is connected with a power grid after passing through a first generator and a second transformer respectively, so that the electric power consumption of the whole system is realized.
The utility model has the advantages that:
the nuclear power station is a pressurized water reactor, a first loop system is formed by high-pressure water circulation, and after the inside of a steam generator is heated by the first loop, the generated saturated steam circularly enters a nuclear turbine from a second loop system to generate power. The water supply outputted from the deaerator in the two-loop system enters the electric heating chemical-link heat storage tank, heat absorption or heat release of the heat storage tank is controlled according to the power requirement of a power grid, steam outputted from the heat storage tank can be used for power generation of a back-pumping steam turbine or the power plant and the industrial steam requirement, the thermoelectric control decoupling or peak regulation function of the whole system can be realized, and the heat storage tank can also be used as a starting boiler of a unit. Aiming at the control characteristics of strong coupling and large inertia of a cogeneration system of a nuclear power unit, the utility model realizes cogeneration of a complex unit by adopting the high-efficiency heat storage decoupling characteristic of the electrothermal chemical-link heat storage tank, and has remarkable economic benefit, social benefit and engineering application prospect.
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 an embodiment of the present utility model;
wherein, 1, a high-pressure cylinder, 2, a low-pressure cylinder, 3, a first generator, 4, a three-way valve for extracting steam, 5, a steam-water separation reheater, 6, a condenser, 7, a condensate pump, 8, a low-pressure heater, 9, a deaerator, 10, a water supply pump, 11, a high-pressure heater, 12, a primary loop circulation pump, 13, a nuclear reactor, 14, a steam generator, 15, a first transformer, 16, an external electric network, 17, a heating head station, 18, a drain pump, 19, a variable-frequency booster pump, the system comprises a main body, an electric heating chemical-looping heat storage tank, a second transformer, a second generator, a back-pumping steam turbine, a small-engine steam inlet valve set, a multi-path steam supply valve set, a secondary steam valve set, a temperature and pressure reducer, a secondary steam header, a low-pressure industrial steam supply network, a medium-pressure industrial steam supply network, a high-pressure industrial steam supply network, a multi-path desuperheater set and a multi-path pressure reducer set.
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, a decoupling and supplying system of a nuclear generator set based on chemical chain energy storage, in this embodiment, the system includes a first loop system and a second loop system of a nuclear power station, an electrothermal chemical chain heat storage system, a back-pumping type turbine power generation system, a multi-path temperature and pressure reducing steam supply system and an internal power grid system. As shown in fig. 1, the main input and output ports represent the following meanings:
steam-water separator reheater inlet, steam-water separator reheater outlet, steam-water separator reheater drain port, d deaerator water supply inlet, e deaerator water supply port, f deaerator outlet, g high pressure cylinder inlet, h nuclear reactor inlet, i nuclear reactor outlet, j steam generator primary loop inlet, k steam generator primary loop outlet, l steam generator water supply inlet, m steam generator primary steam outlet, n auxiliary steam header outlet for factory, o auxiliary steam header inlet for factory, p heating first station inlet, q heating first station outlet, r. electric heating chemical chain heat storage tank water supply inlet, s. electric heating chemical chain heat storage tank outlet, t. back extraction steam turbine inlet.
In this embodiment, the primary loop system of the nuclear power plant includes a nuclear reactor 13 connected to a steam generator inlet j through a primary loop outlet i, a primary pump 12 connected to a primary loop outlet k, and a primary circulation pump 12 connected to a nuclear reactor inlet h.
In this embodiment, the nuclear power station secondary loop system includes a steam generator 14, a main steam outlet m of the steam generator is connected with an inlet g of a high-pressure cylinder 1 of a steam turbine, an outlet of the high-pressure cylinder of the steam turbine is connected with an inlet a of a steam-water separator reheater 5, steam is extracted from main steam at a heating side of the steam-water separator reheater to heat the steam at the outlet of the high-pressure cylinder, and the heated steam is cooled to form drain water and flows out from an outlet c. One path of the heated steam enters the low-pressure cylinder 2 from the three-way regulating valve 4 for acting and generating electricity, the other path of the heated steam enters the heating head station 17, and the steam after heat release of the heating head station is converged with the water supply of the condensate pump 7 through the drain pump 18. The outlet of the low-pressure cylinder is connected with a condenser 6, the outlet of the condenser is connected with a condensate pump 7 at one time, a deaerator 9 of a low-pressure heater 8, and feed water is split from an outlet f of the deaerator, and one path of feed water sequentially enters a feed water pump 10 and a high-pressure heater 11 and returns to a steam generator 14 through a feed water inlet l; the other path enters the electrothermal chemical-looping heat storage tank 20 through the water supply inlet r by the variable-frequency booster pump 19.
In this embodiment, the internal power grid system is mainly composed of two generators (a first generator 3 and a second generator 22) and two transformers (a first transformer 15 and a second transformer 21), and the electric heating end of the electric heating chemical-link heat storage tank is connected to the internal power grid. The steam output end s is split by the small-machine steam inlet valve group 24, the multi-path steam supply valve group 25 and the auxiliary steam valve 26 in sequence. One path of steam enters the back extraction steam turbine 23 (which can be a single multi-section adjustable back extraction steam turbine or a series-parallel combination of a plurality of back extraction presses or back extraction machines) through the inlet t of the small-machine steam inlet valve bank 24 to do work and generate electricity, and enters the multi-path attemperator set 32 through the multi-path steam extraction ports of the back extraction steam turbine to output steam with different pressures to an industrial steam supply heat supply network. The other steam is decompressed step by the multi-channel steam supply valve group 25 and then enters the multi-channel pressure reducer 33 group, the multi-channel steam supply valve group is converged with the extracted steam, and then enters the industrial steam supply heat supply network by the multi-channel temperature reducer group 32. The third path, namely, the steam passing through the auxiliary steam valve 26 enters the temperature and pressure reducer 27 only when the unit is started, enters the auxiliary steam header for the plant through the inlet o, and is supplied to a steam system for the plant, such as a deaerator, a shaft seal steam and the like through the outlet n. In other words, the electrothermal chemical-looping heat storage tank can be used as a starting boiler of a unit.
In this embodiment, the exhaust outlet of the back extraction turbine is branched and converged by the low pressure cylinder inlet three-way valve to be connected with the inlet p of the heating head station, and the heat is released and flows out from the outlet q, and finally is converged into the main water supply pipeline by the drainage pump 18.
In this embodiment, the electrothermal chemical-link heat storage tank 20 is composed of an electric heating (electric boiler), chemical-link heat storage, water heating and evaporation, and other systems. When the device stores heat, the electric boiler is connected to heat the heat storage medium, and the heat storage medium generates chemical reaction to store heat (chemical energy+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 at the same time) and then is changed into steam to be output. When the power grid needs the unit to output lower electric power, the power of the generator can be kept unchanged or changed little, and the excessive electric energy is used for heating water to generate steam or heating a heat storage medium to store heat; when the power grid needs the unit to output higher power, the heat storage medium of the device releases heat to heat water to generate steam in order to ensure heat supply. And the heat storage tank device can also be used as a starting boiler of a unit. Therefore, the thermal decoupling can be realized, the load adjusting range of the nuclear power turbine unit can be widened, and the thermal decoupling device has important theoretical research and engineering application values.
The utility model realizes thermoelectric peak shaving decoupling control of the whole system by adopting a mode of combining a nuclear power station cogeneration system and an electrothermal chemical chain heat storage tank. When in heat accumulation, the device is connected, the electric boiler heats the heat accumulation medium, and the heat accumulation medium generates chemical reaction for heat accumulation (chemical energy+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 at the same time) and then is changed into steam to be output. When the power grid needs the unit to output lower electric power, the power of the generator can be kept unchanged or changed little, and the excessive electric energy is used for the device to heat water to generate steam or heat a heat storage medium to store heat; when the power grid needs the unit to output higher power, the heat storage medium of the device releases heat to heat water to generate steam in order to ensure heat supply. Therefore, the thermal decoupling can be realized, and the load adjusting range of the nuclear power turbine unit can be widened. In addition, the heat storage device has high energy storage density which is 2-10 times that of the sensible heat storage equipment, and can be used as a starting boiler of a unit. 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 (4)
1. The decoupling and supplying system of the nuclear motor unit based on the chemical chain energy storage is characterized by comprising a primary loop system of a nuclear power station, a secondary loop system of the nuclear power station and an internal power grid system;
the primary loop system of the nuclear power station comprises a nuclear reactor (13), the nuclear reactor (13) is connected with an inlet j of a steam generator (14) through a loop outlet i, a loop outlet k of the steam generator (14) is connected with a main circulating pump (12), the main circulating pump (12) is connected with a nuclear reactor inlet h, the secondary loop system of the nuclear power station comprises a steam generator (14), a main steam outlet m of the steam generator (14) is connected with an inlet g of a steam turbine high-pressure cylinder (1), an outlet of the steam turbine high-pressure cylinder (1) is connected with an inlet a of a steam-water separation reheater (5), steam is independently extracted from a heating side of the steam-water separation reheater (5) to heat steam at an outlet of the high-pressure cylinder, heated steam is cooled to form hydrophobic steam which flows out from an outlet c, and the heated steam enters a low-pressure cylinder (2) from a three-way extraction three-way regulating valve (4) to perform work and power generation, and the other path enters a heating head station (17);
the outlet of the low-pressure cylinder (2) is connected with a condenser (6), the outlet of the condenser (6) is sequentially connected with a condensate pump (7), a low-pressure heater (8) and a deaerator (9), water is split from the outlet f of the deaerator, one path of water enters a water supply pump (10) and a high-pressure heater (11) in sequence, and the water returns to the steam generator (14) through a water supply inlet l of the steam generator (14); the other path enters the electrothermal chemical-looping heat storage tank (20) through a water inlet r of the electrothermal chemical-looping heat storage tank (20) through a variable-frequency booster pump (19), and steam after heat release of the heating head station (17) is converged with water supply of the condensation water pump (7) through a drainage pump (18);
the internal power grid system comprises a first generator (3), a second generator (22), a first transformer (15) and a second transformer (21), and an electric heating end of the electric heating chemical chain heat storage tank (20) is connected to the internal power grid system; the steam output end s of the electric heating chemical-looping heat storage tank (20) is split by a small-machine steam inlet valve group (24), a multi-channel steam supply valve group (25) and an auxiliary steam valve (26) in sequence; the first steam enters the back extraction steam turbine (23) through the inlet t through the small-machine steam inlet valve group (24) to do work and generate electricity, and enters the multi-channel desuperheater group (32) through the multi-channel steam extraction ports of the back extraction steam turbine (23) to output steam with different pressures to the industrial steam supply heat network; the second steam enters a multi-path pressure reducer (33) group through a multi-path steam supply valve group (25) for gradual pressure reduction, then is divided into multiple paths to be converged with the back extraction steam turbine (23), and then enters an industrial steam supply heat supply network through a multi-path desuperheater group (32); the third steam enters a temperature and pressure reducer (27) when the unit is started through an auxiliary steam valve (26), enters the auxiliary steam header (28) through an inlet o of the auxiliary steam header (28) for the plant, and is supplied to a steam system for the plant such as a deaerator and shaft seal steam through an outlet n of the auxiliary steam header (28) for the plant.
2. The decoupling and supplying system of a nuclear power unit based on chemical chain energy storage according to claim 1, wherein the steam outlet of the back pumping steam turbine (23) is connected with the inlet p of the heating head station (17) after being converged by the three-way valve branch of the inlet of the low-pressure cylinder (2), and flows out from the outlet q after releasing heat, and finally flows into a main water supply pipeline between the condensate pump (7) and the low-pressure heater (8) through the drain pump (18).
3. A nuclear power unit decoupling supply system based on chemical chain energy storage according to claim 1, characterized in that the internal power grid comprises a first generator (3), the first generator (3) being connected to an external power grid (16) through a first transformer (15); the internal grid further comprises a second generator (22), the second generator (22) being connected to a second transformer (21) and finally to the external grid (16) via a first transformer (15).
4. The nuclear power unit decoupling power supply system based on chemical chain energy storage according to claim 1, wherein the thermal energy stored in the electrothermal chemical chain heat storage tank (20) is provided by an electric heating boiler, and the electric heating boiler is connected with an external power grid (16) after passing through the first generator (3) and the second transformer (21) respectively.
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| CN202223422983.7U CN219262468U (en) | 2022-12-16 | 2022-12-16 | Nuclear motor unit decoupling and supplying system based on chemical chain energy storage |
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