CN216790134U - Fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output - Google Patents
Fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output Download PDFInfo
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- CN216790134U CN216790134U CN202220230174.7U CN202220230174U CN216790134U CN 216790134 U CN216790134 U CN 216790134U CN 202220230174 U CN202220230174 U CN 202220230174U CN 216790134 U CN216790134 U CN 216790134U
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Abstract
The utility model discloses a fused salt heat storage coupling pure condensation thermal power generating unit system capable of realizing zero output, which comprises a pure condensation thermal power generating unit, a heat storage and exchange system and an electric heating system, wherein the pure condensation thermal power generating unit is connected with the electric heating system through a pipeline; a boiler steam outlet of the straight condensing thermal power generating unit is connected with a steam inlet of a steam-molten salt heat exchanger of the heat storage and exchange system, and a steam outlet of the steam-molten salt heat exchanger is connected with a boiler steam inlet of the straight condensing thermal power generating unit; the outlet of the generator of the pure condensation thermal power unit is connected with the cable inlet of the electric heater of the electric heating system; the unit can store part of heat in a heat storage and exchange system in a high-temperature molten salt form by leading out part of steam and molten salt for heat exchange, so that deep peak shaving is realized and part of heat is stored at the same time; the unit can also lead the electric power at the outlet of the generator into the electric heater to heat the molten salt, so that zero output of the unit is realized. The unit has a peak load regulation range of 0-100%, and the operation flexibility is greatly improved; the heat stored by the heat storage and exchange system can be returned to the unit when the unit is under high load, so that the coal consumption is reduced, and the economy is improved.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation, and particularly relates to a fused salt heat storage coupling pure condensation power unit system capable of realizing zero output.
Background
The establishment of a novel power system mainly based on new energy is an important means for realizing the 3060 double-carbon target, and on the basis, large-scale renewable energy sources are connected to a power grid in the future. The thermal power unit still occupies the position of the middle stream column in the existing power grid, and generates more than 60% of electric quantity according to the installation proportion of more than 50%, but along with the large amount of new energy connected into the power grid, the thermal power unit needs to greatly improve the flexibility in the future so as to effectively control the power abandonment rate of the new energy. However, the wind and light abandoning rate in northwest areas of China is still high at present, and the main reason is the insufficient peak regulation capability in the system. Taking a thermal power generating unit as an example, the actual peak regulation capacity of the pure condensation thermal power generating unit in China at present is generally about 50% of the rated capacity, the peak regulation capacity of the heat supply unit in the heat supply period is only about 20% of the rated capacity, and the requirement of a novel power system on the flexibility in the future cannot be met. For the problem, the load regulation capability of the existing or newly-built thermal power generating unit needs to be increased, but how to configure the existing or newly-built thermal power generating unit to achieve the peak load regulation range as large as possible is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, and provides a fused salt heat storage coupled pure condensation thermal power unit system capable of realizing zero output, so that the peak load regulation range and flexibility of the unit are increased.
In order to achieve the above object, the present invention has the following technical means: a fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output comprises a pure condensation thermal power unit, a heat storage and exchange system and an electric heating system; the electric energy output end of the straight condensing thermal power generating unit is connected to a power grid; the heat storage and exchange system comprises a cold molten salt storage tank, a hot molten salt storage tank and a steam-molten salt heat exchanger; the steam inlet and outlet of the straight condensing thermal power generating unit are connected with the steam inlet and outlet of a medium steam-molten salt heat exchanger of the heat storage and exchange system through a pipeline, and the electric energy output end of the straight condensing thermal power generating unit is also connected with the electric energy input end of an electric heater of the electric heating system; a plurality of electric heaters are arranged in the electric heating system; the outlet of the cold molten salt storage tank is divided into two paths to be respectively connected with the steam-molten salt heat exchanger and the electric heater; the steam-molten salt heat exchanger and the electric heater are respectively connected with the hot molten salt storage tank.
A first valve is arranged on a steam pipeline from the pure condensation thermal power generating unit to the heat storage and exchange system; a second valve is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank to the steam-molten salt heat exchanger; a third valve is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank to the inlet of the electric heater; the first valve, the second valve and the third valve are all adjustable valves.
The pure thermal power generating unit is provided with a boiler, and a steam inlet and a steam outlet of the boiler are used as the steam inlet and the steam outlet of the pure thermal power generating unit.
The electric heaters are connected in series or in parallel.
The first valve, the second valve and the third valve are all adjusting valves, wherein the steam flow entering the heat storage and exchange system from the pure condensation power generating unit is controlled by controlling the opening of the first valve; controlling the flow of cold molten salt entering the steam-molten salt heat exchanger by controlling the opening degree of the second valve; and controlling the flow of the hot molten salt entering the electric heater by controlling the opening degree of the third valve.
The cold molten salt storage tank adopts a single cold molten salt storage tank or a plurality of cold molten salt storage tanks which are connected in series; the hot molten salt storage tank adopts a single hot molten salt storage tank or a plurality of hot molten salt storage tanks connected in series.
The hot molten salt storage tank is sequentially connected with the hot side of the steam-molten salt heat exchanger and the cold molten salt storage tank, a fourth valve is arranged on a pipeline from the hot molten salt storage tank to the steam-molten salt heat exchanger, a cold side inlet of the steam-molten salt heat exchanger is connected with a boiler water supply pipeline, and an adjustable valve is arranged from the cold side inlet of the steam-molten salt heat exchanger to the boiler water supply pipeline.
The electric heater is connected to the external heat exchanger set and used for heating working media in the external heat exchanger set.
Compared with the prior art, the utility model at least has the following beneficial effects:
1) when the unit participates in peak shaving of a power grid and needs to reduce output, partial heat can be stored in the heat storage and exchange system in a high-temperature molten salt mode through heat exchange of partial steam led out of the unit and the molten salt, deep peak shaving is achieved, and partial heat is stored at the same time;
2) when the power grid needs the unit to further reduce the output, the system can lead the electric quantity at the outlet of the generator to the electric heater through the electric heater to heat the molten salt, convert the electric energy into heat energy and store the heat energy in the heat storage and exchange system in the form of high-temperature molten salt, thereby realizing zero output of the unit;
3) compared with the direct closing of the unit, the system is equivalently in a hot standby state, and when the power grid needs, the unit can be quickly increased to a required load.
4) The heat is stored in the form of high-temperature molten salt, and when the unit is under a high load, the heat can be returned to the unit in a water supply or steam heating mode, so that the coal consumption is reduced, and the economy of the unit is improved.
Drawings
FIG. 1 is a schematic structural diagram of a fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output;
FIG. 2 is a schematic diagram of another system in which the present invention may be implemented.
In the drawings: 1-a boiler; 2-a steam turbine; 3, a generator; 4-steam-molten salt heat exchanger; 5-cold molten salt storage tank; 6-hot melting salt storage tank; 7-an electric heater; 8-a power grid; 9-a first valve; 10-a second valve; 11-the third valve, 12-the fourth valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the fused salt heat storage coupled pure thermal power generating unit system capable of realizing zero output comprises a pure thermal power generating unit, a heat storage and exchange system and an electric heating system; wherein the pure condensation power unit comprises a boiler 1, a steam turbine 2 and a generator 3; the heat storage and exchange system comprises a cold molten salt storage tank 5, a hot molten salt storage tank 6 and a steam-molten salt heat exchanger 4; the electric heating system comprises a plurality of electric heaters 7; a steam outlet of a boiler 1 in the pure condensation thermal power generating unit is connected with a steam inlet of a steam-molten salt heat exchanger 4 of the heat storage and exchange system, and a steam outlet of the steam-molten salt heat exchanger 4 is connected with a steam inlet of the boiler 1 in the pure condensation thermal power generating unit; the power output end of the generator 3 of the pure condensation thermal power generating unit is connected with the power input end of an electric heater 7 in the electric heating system; an outlet of a cold molten salt storage tank 5 of the heat storage and exchange system is connected with a molten salt inlet of an electric heater 7 of the electric heating system, and a molten salt outlet of the electric heater 7 is connected with an inlet of a hot molten salt storage tank 6 of the heat storage and exchange system; the steam inlet and outlet of the boiler 1 are provided with temperature and pressure monitoring points, and the outlet of the electric heater 7 is provided with a temperature monitoring point.
In the electric heating system, the plurality of electric heaters 7 may be connected in series or in parallel.
As an alternative embodiment of the electric heating system, a part of the electric heater can be used for heating water, and the water enters the heat exchange unit for circulating heat exchange and can be used for providing heat for the heating system.
When the space is limited or the required capacity is small, the cold molten salt storage tank 5 adopts a single cold molten salt storage tank; the hot-melt salt storage tank 6 adopts a single hot-melt salt storage tank. When the required capacity is large, the cold molten salt storage tank 5 is connected in series by adopting a plurality of cold molten salt storage tanks, and the hot molten salt storage tank 6 is connected in series by adopting a single hot molten salt storage tank or a plurality of hot molten salt storage tanks.
As an optional embodiment, the heat stored in the hot-melt salt storage tank 6 is used for heat supply, the hot-melt salt storage tank 6 is sequentially connected with the hot side of the steam-molten salt heat exchanger and the cold-melt salt storage tank 5, and the steam-molten salt heat exchanger is arranged in the heat storage and exchange system.
A first valve 9 is arranged on a steam pipeline from the pure condensation thermal power generating unit to the heat storage and exchange system; a second valve 10 is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank to the steam-molten salt heat exchanger; a third valve 11 is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank to the inlet of the electric heater; the first valve 9, the second valve 10 and the third valve 11 are all adjusting valves, and the steam flow entering the heat storage and exchange system from the pure condensed thermal power generating unit can be controlled by controlling the opening of the first valve 9, so that the load of the pure condensed thermal power generating unit is reduced as required; the flow of cold molten salt entering the steam-molten salt heat exchanger 4 can be controlled by controlling the opening degree of the second valve 10, so that the control of the temperature of the hot molten salt at the outlet of the heat exchanger is realized; the flow of the hot melt salt entering the electric heater can be controlled by controlling the opening degree of the third valve 11, so that the temperature of the hot melt salt at the outlet of the electric heater can be controlled.
The utility model can also connect the electric heater 7 to the external heat exchanger set for heating the working medium in the external heat exchanger set.
The working process and principle of the utility model are as follows:
when the load reduction and peak regulation of the pure condensed thermal power generating unit are required by the power grid, the first valve 9 is opened, part of steam is led out to the steam-molten salt heat exchanger 4 of the heat storage and exchange system, meanwhile, the second valve 10 is opened, cold molten salt enters the steam-molten salt heat exchanger 4 to exchange heat with the steam, low-quality steam after heat exchange returns to the pure condensed thermal power generating unit, and hot molten salt after heat exchange returns to the hot molten salt storage tank 6; because part of steam heat in the pure condensation thermal power unit is transferred into a molten salt medium through heat exchange, the power generation power of the pure condensation thermal power unit is reduced, and the load reduction is realized;
when the power grid needs zero output of the pure freezing thermal power generating unit, the third valve is opened simultaneously on the basis of the steps, so that cold molten salt enters the electric heater 7, the electric power of the generator is introduced into the electric heater of the electric heating system to heat the molten salt, and the heated hot molten salt returns to the hot molten salt storage tank; because the power output at the outlet of the generator is completely led out to the electric heating system, the energy is transferred to the molten salt medium through heat exchange, no power is actually supplied to the network, and zero output of the unit is realized.
Referring to fig. 2, the molten salt is heated by boiler steam and electricity, the heat is stored, and the heat is reversely exchanged when releasing heat. The reverse heat exchange is realized by the steam-molten salt heat exchanger 4, the feed water is led out from the pure condensation thermal power generating unit, the hot molten salt enters the steam-molten salt heat exchanger 4 from the hot molten salt storage tank 6, the feed water exchanges heat with the molten salt to generate steam, the steam returns to the pure condensation thermal power generating unit through the first valve 9, meanwhile, the fourth valve 12 is opened, the hot molten salt returns to the cold molten salt storage tank 5 after the heat exchange of the steam-molten salt heat exchanger 4 is finished, and at the moment, the electric heating system does not operate.
In this embodiment, the molten salt is a binary molten salt containing sodium nitrate and potassium nitrate as main components or a ternary molten salt containing sodium nitrate, potassium nitrate and sodium nitrite as main components.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the following claims.
Claims (8)
1. The utility model provides a can realize pure thermal power unit system that congeals of fused salt heat-retaining coupling of zero power which characterized in that: the system comprises a pure condensation thermal power generating unit, a heat storage and exchange system and an electric heating system; the electric energy output end of the straight condensing thermal power generating unit is connected to a power grid; the heat storage and exchange system comprises a cold molten salt storage tank (5), a hot molten salt storage tank (6) and a steam-molten salt heat exchanger (4); a steam inlet and a steam outlet of the pure condensation thermal power generating unit are connected with a steam inlet and a steam outlet of a medium steam-molten salt heat exchanger (4) of the heat storage and exchange system through pipelines, and an electric energy output end of the pure condensation thermal power generating unit is also connected with an electric energy input end of an electric heater of the electric heating system; a plurality of electric heaters (7) are arranged in the electric heating system; the outlet of the cold molten salt storage tank (5) is divided into two paths to be respectively connected with the steam-molten salt heat exchanger (4) and the electric heater (7); the steam-molten salt heat exchanger (4) and the electric heater (7) are respectively connected with a hot-melt salt storage tank (6).
2. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: a first valve (9) is arranged on a steam pipeline from the pure condensation thermal power generating unit to the heat storage and exchange system; a second valve (10) is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank (5) to the steam-molten salt heat exchanger (4); a third valve (11) is arranged on a molten salt pipeline from the outlet of the cold molten salt storage tank (5) to the inlet of the electric heater; the first valve (9), the second valve (10) and the third valve (11) are all adjustable valves.
3. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 2, characterized in that: the first valve (9), the second valve (10) and the third valve (11) are all adjusting valves, wherein the steam flow entering the heat storage and exchange system from the pure condensation thermal power generating unit is controlled by controlling the opening of the first valve (9); the flow of cold molten salt entering the steam-molten salt heat exchanger (4) is controlled by controlling the opening degree of the second valve (10); the flow of the hot melt salt entering the electric heater (7) is controlled by controlling the opening of the third valve (11).
4. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: the pure condensation thermal power generating unit is provided with a boiler (1), and a steam inlet and outlet of the boiler (1) is used as a steam inlet and outlet of the pure condensation thermal power generating unit.
5. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: the electric heaters (7) are connected in series or in parallel.
6. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: the cold molten salt storage tank (5) adopts a single cold molten salt storage tank or a plurality of cold molten salt storage tanks which are connected in series; the hot molten salt storage tank (6) adopts a single hot molten salt storage tank or a plurality of hot molten salt storage tanks connected in series.
7. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: the hot molten salt storage tank (6) is sequentially connected with a hot side of the steam-molten salt heat exchanger (4) and the cold molten salt storage tank (5), a fourth valve (12) is arranged on a pipeline from the hot molten salt storage tank (6) to the steam-molten salt heat exchanger (4), a cold side inlet of the steam-molten salt heat exchanger (4) is connected with a boiler water supply pipeline, and an adjustable valve is arranged from a cold side inlet of the steam-molten salt heat exchanger (4) to the boiler water supply pipeline.
8. The zero-output-force-realizable molten salt heat-storage-coupled pure-condensing power unit system according to claim 1, characterized in that: the electric heater (7) is connected to an external heat exchange unit and used for heating working media in the external heat exchange unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220230174.7U CN216790134U (en) | 2022-01-27 | 2022-01-27 | Fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220230174.7U CN216790134U (en) | 2022-01-27 | 2022-01-27 | Fused salt heat storage coupling pure condensation thermal power unit system capable of realizing zero output |
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