CN213956089U - Low-load denitration system of thermal power plant based on fused salt energy storage system - Google Patents
Low-load denitration system of thermal power plant based on fused salt energy storage system Download PDFInfo
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- CN213956089U CN213956089U CN202021485457.3U CN202021485457U CN213956089U CN 213956089 U CN213956089 U CN 213956089U CN 202021485457 U CN202021485457 U CN 202021485457U CN 213956089 U CN213956089 U CN 213956089U
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Abstract
The utility model provides a low-load denitration system of a thermal power plant based on a fused salt energy storage system, which is characterized by comprising a conventional thermal power generation system and a high-pressure steam fused salt energy storage system; the conventional thermal power generation system adopts SCR technology for denitration; high-pressure steam generated by a conventional thermal power generation system is output to a high-pressure steam molten salt energy storage system through a pipeline; the high-pressure steam and the high-pressure steam molten salt energy storage system exchange heat to form high-pressure condensed water, and the high-pressure condensed water is sent back to the conventional thermal power generation system through a high-pressure condensed water pipeline; the high-pressure condensed water pipeline is communicated with an outlet pipeline at the water side of an economizer of the conventional thermal power generation system; and a bypass water supply pipeline of the economizer is respectively communicated with the high-pressure condensed water pipeline and a water supply pipeline of the conventional thermal power generation system. The utility model discloses denitration effect when guaranteeing fused salt energy storage system normal operating and boiler low-load operation.
Description
Technical Field
The utility model relates to an energy storage technology field, concretely relates to low-load denitration system of thermal power factory based on fused salt energy storage system.
Background
In order to promote the grid-connected consumption of new energy power generation in China, the national development and improvement committee and the energy agency jointly strengthen the peak regulation capacity construction of the power system and comprehensively promote the peak regulation of the system. One of the means is to increase the modification force of peak shaving of the coal-fired power station and increase the capability of peak shaving of coal-fired power. The deep peak regulation of the thermal power plant is beneficial to ensuring the heating of the thermoelectric unit in winter, avoiding the problems of abandoning wind and light and realizing the aim of adjusting the energy structure in China.
Meanwhile, SCR flue gas denitration modification is basically carried out in the coal-fired power generation industry since the national emission standard of atmospheric pollutants of thermal power plants is issued and implemented, and the flue gas temperature is generally required to reach over 320 ℃ during operation. Under the situation of deep modification of a thermal power generating unit, the operation with ultra-low load (less than 40% of rated load) is required, but when the operation with ultra-low load is carried out, the lowest load limit is limited by the flue gas temperature, and the flue gas temperature is too low to meet the operation requirement of the SCR catalyst.
Although the current technical scheme can achieve the purpose of deep peak regulation, the inlet flue gas temperature of the SCR denitration device can not be guaranteed during deep peak regulation of the unit, and the pollutant emission standard can not be met during low-load operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an aim at is exactly to prior art's defect, provides a thermal power factory low-load deNOx systems based on fused salt energy storage system, denitration effect when guaranteeing fused salt energy storage system normal operating and boiler low-load operation.
The utility model provides a low-load denitration system of a thermal power plant based on a fused salt energy storage system, which is characterized by comprising a conventional thermal power generation system and a high-pressure steam fused salt energy storage system; the conventional thermal power generation system adopts SCR technology for denitration; high-pressure steam generated by a conventional thermal power generation system is output to a high-pressure steam molten salt energy storage system through a pipeline; the high-pressure steam and the high-pressure steam molten salt energy storage system exchange heat to form high-pressure condensed water, and the high-pressure condensed water is sent back to the conventional thermal power generation system through a high-pressure condensed water pipeline; the high-pressure condensed water pipeline is communicated with an outlet pipeline at the water side of an economizer of the conventional thermal power generation system; and a bypass water supply pipeline of the economizer is respectively communicated with the high-pressure condensed water pipeline and a water supply pipeline of the conventional thermal power generation system.
In the technical scheme, a bypass water supply pipeline of the economizer is provided with a first electromagnetic valve.
In the technical scheme, the high-pressure steam molten salt energy storage system comprises a high-temperature molten salt heat storage tank, a low-temperature molten salt heat storage tank and a heater group; molten salt in the low-temperature molten salt heat storage tank enters the high-temperature molten salt heat storage tank after passing through the heater group through the molten salt pipeline; high-pressure steam of a conventional thermal power generation system enters a heater group through a steam pipeline to exchange heat with molten salt; the high-pressure steam is converted into high-pressure condensed water after heat exchange; the high-pressure condensed water is output to the water outlet end of the coal economizer through the high-pressure condensed water pipeline.
In the technical scheme, the high-pressure condensate water pipeline is provided with the high-pressure water condensate pump.
In the technical scheme, the high-pressure condensed water pipeline is provided with a second electromagnetic valve, and the second electromagnetic valve is arranged close to the water side outlet pipeline of the economizer.
In the technical scheme, when the conventional thermal power generation system operates in deep peak regulation and low load, high-pressure condensed water generated by molten salt energy storage is directly conveyed to an outlet pipeline at the water side of the economizer; when the conventional thermal power generation system needs to further increase the inlet flue gas temperature of the SCR denitration device, a first electromagnetic valve on the economizer bypass water supply pipeline is opened and the opening degree is adjusted, high-pressure feed water in the water supply pipeline of the conventional thermal power generation system flows into a high-pressure condensed water pipeline, the feed water flow of the economizer is reduced, and the outlet temperature of the flue gas side of the economizer under the low-load working condition is maintained.
The utility model provides a thermal power plant low-load denitration system based on a fused salt energy storage system, which can reduce the steam inlet volume of a steam turbine when high-pressure steam directly heats fused salt for energy storage, thereby reducing the power generation power and realizing deep peak regulation; the high-pressure condensate water after heat exchange between the high-pressure steam and the molten salt is high in temperature, and is directly sent into an economizer water side outlet pipeline of a conventional thermal power generation system after being pressurized, so that the feed water flow of the economizer can be reduced, the inlet flue gas temperature of the SCR denitration device under the low-load working condition is maintained, and the denitration effect of the normal operation of the molten salt energy storage system and the low-load operation of the boiler is ensured. In order to ensure the denitration effect of the conventional thermal power generation system, when the inlet flue gas temperature of the SCR denitration device needs to be further increased, the first electromagnetic valve on the economizer bypass water supply pipeline is opened and the opening degree is adjusted, high-pressure feed water in the water supply pipeline of the conventional thermal power generation system flows into the high-pressure condensate pipeline, and the feed water flow of the economizer is further reduced.
Drawings
Fig. 1 is a schematic view of the present invention;
the system comprises a 1-conventional thermal power generation system, a 1.1-economizer, a 1.2-economizer water side outlet pipeline, a 1.3-denitration device, a 1.4-economizer bypass water supply pipeline, a 1.5-conventional thermal power generation system water supply pipeline, a 1.6-first electromagnetic valve, a 1.7-second electromagnetic valve, a 2-high-pressure steam molten salt energy storage system, a 2.1-high-temperature molten salt heat storage tank, a 2.2-low-temperature molten salt heat storage tank, a 2.3-heater group, a 2.4-high-pressure condensate pipeline and a 2.5-high-pressure condensate pump, wherein the water side outlet pipeline is connected with the water side outlet pipeline through the 1.3-denitration device.
Detailed Description
The invention will be further described in detail with reference to the drawings and the following detailed description, which are provided for the purpose of clearly understanding the invention and are not intended to limit the invention.
As shown in figure 1, the utility model provides a low-load denitration system of a thermal power plant based on a molten salt energy storage system. When the conventional thermal power generation system 1 is in deep peak regulation and low-load operation, high-pressure steam enters the high-pressure steam molten salt energy storage system 2 for storing energy, so that the steam inlet quantity of a steam turbine of the conventional thermal power generation system 1 can be reduced, and the power generation power is reduced to realize deep peak regulation; the high-pressure steam and the high-pressure steam fused salt energy storage system 2 are subjected to heat exchange and then changed into high-pressure condensed water with higher temperature, the high-pressure condensed water is pressurized by the high-pressure condensed water pump 2.5 and then is directly sent into an economizer water side outlet pipeline 1.2 of the conventional thermal power generation system 1 through a high-pressure condensed water pipeline 2.4, the water supply flow of the economizer 1.1 can be reduced, the inlet flue gas temperature of the SCR denitration device 1.3 under the low-load working condition is maintained, and the denitration effects of normal operation of the high-pressure steam fused salt energy storage system 2 and low-load operation of the boiler of the conventional thermal power generation system 1 are ensured.
In order to ensure the denitration effect of the conventional thermal power generation system 1, when the inlet flue gas temperature of the SCR denitration device 1.3 needs to be further increased, the first electromagnetic valve 1.6 on the economizer bypass water supply pipeline 1.4 is opened and the opening degree is adjusted, high-pressure feed water in the water supply pipeline 1.5 of the conventional thermal power generation system flows into the high-pressure condensate pipeline 2.4, the feed water flow of the economizer 1.1 is further reduced, and the outlet temperature of the flue gas side of the economizer 1.1 can be further increased.
According to the difference of the unit parameters and the thermophysical properties of the molten salt of the thermal power plant, the temperature of the high-pressure steam molten salt energy storage system 2 for generating the high-pressure condensed water may be different, and the molten salt is binary salt (KNO) under the condition of the conventional subcritical and supercritical unit parameters340％、NaNO360%), the temperature of the high pressure steam molten salt energy storage system 2 producing high pressure condensate is about 300 ℃.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. A low-load denitration system of a thermal power plant based on a molten salt energy storage system is characterized by comprising a thermal power generation system and a high-pressure steam molten salt energy storage system; the thermal power generation system adopts SCR technology for denitration; high-pressure steam generated by the thermal power generation system is output to the high-pressure steam molten salt energy storage system through a pipeline; the high-pressure steam and the high-pressure steam molten salt energy storage system exchange heat to form high-pressure condensed water, and the high-pressure condensed water is sent back to the thermal power generation system through a high-pressure condensed water pipeline; the high-pressure condensed water pipeline is communicated with an outlet pipeline at the water side of an economizer of the thermal power generation system; a bypass water supply pipeline of the economizer is respectively communicated with the high-pressure condensed water pipeline and a water supply pipeline of the thermal power generation system; and a bypass water supply pipeline of the economizer is provided with a first electromagnetic valve.
2. The low-load denitration system of the thermal power plant based on the molten salt energy storage system according to claim 1, characterized in that the high-pressure steam molten salt energy storage system comprises a high-temperature molten salt heat storage tank, a low-temperature molten salt heat storage tank and a heater group; molten salt in the low-temperature molten salt heat storage tank enters the high-temperature molten salt heat storage tank after passing through the heater group through the molten salt pipeline; high-pressure steam of the thermal power generation system enters the heater group through a steam pipeline to exchange heat with molten salt; the high-pressure steam is converted into high-pressure condensed water after heat exchange; the high-pressure condensed water is output to the water outlet end of the coal economizer through the high-pressure condensed water pipeline.
3. The low-load denitration system of the thermal power plant based on the molten salt energy storage system according to claim 2, characterized in that a high-pressure water condensate pump is arranged on the high-pressure condensate pipeline.
4. The low-load denitration system of the thermal power plant based on the molten salt energy storage system as claimed in claim 3, wherein a second electromagnetic valve is arranged on the high-pressure condensed water pipeline, and the second electromagnetic valve is arranged close to the water-side outlet pipeline of the economizer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
| CN115121101B (en) * | 2022-04-25 | 2023-10-10 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit |
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