CN-122015060-A - Energy storage peak shaving system

CN122015060ACN 122015060 ACN122015060 ACN 122015060ACN-122015060-A

Abstract

The application relates to the technical field of deep peak regulation and energy storage of coal-fired power plants, in particular to an energy storage peak regulation system which comprises a primary energy storage pipeline, a steam conveying pipeline and a controller, wherein the primary energy storage pipeline comprises a heat collecting device, a primary energy storage device, a primary circulating fan and a primary heat exchanger which are sequentially connected through pipelines, gas circularly flows in the primary energy storage pipeline, the heat collecting device is used for absorbing solar energy and converting the absorbed solar energy into heat energy so as to heat the gas flowing through the heat collecting device, a solid heat storage material is arranged in the primary energy storage device, and the primary heat exchanger is used for exchanging heat with condensed water flowing out of an output end of a generator. According to the application, the molten salt is replaced by the solid heat storage material, so that the problems of unsmooth operation of the system and reduced operation efficiency caused by crystallization of the molten salt due to low temperature are avoided. And meanwhile, the solid heat storage material is heated by utilizing solar energy, plant resources are fully utilized, the system operation energy consumption is reduced, and the operation cost is saved.

Inventors

DENG CHENGGANG
LI MING
SHI TAO
ZHENG JUN
JIA BIN
LI WEIKE
SUN ZHANGWEI
ZHU JUNHUI
ZENG BING

Assignees

中国能源建设集团广东省电力设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260303

Claims (10)

1. An energy storage peak shaving system, comprising: The primary energy storage pipeline comprises a heat collection device, a primary energy storage device, a primary circulating fan and a primary heat exchanger which are sequentially connected through pipelines, gas circularly flows in the primary energy storage pipeline, the heat collection device is used for absorbing solar energy and converting the absorbed solar energy into heat energy so as to heat the gas flowing through the heat collection device, a solid heat storage material is arranged in the primary energy storage device, the primary heat exchanger is connected with the heat collection device through a first pipeline, the input end of the primary heat exchanger is connected with the output end of the generator set, and the primary heat exchanger is used for exchanging heat with condensed water flowing out of the output end of the generator set; The steam delivery pipeline is provided with a steam-water separator, the input end of the steam-water separator is connected with the output end of the primary heat exchanger through a second pipeline, the steam-water separator is used for separating water and steam output by the primary heat exchanger, the output end of the steam-water separator is connected with a steam turbine or a heat supply header through a third pipeline so as to deliver the separated steam to the steam turbine or the heat supply header, and the third pipeline is provided with a first valve; And the controller is respectively and electrically connected with the heat collecting device, the primary energy storage device, the primary circulating fan, the primary heat exchanger and the steam-water separator.
2. The energy storage peak shaving system according to claim 1, further comprising a secondary energy storage pipeline, wherein the secondary energy storage pipeline comprises a secondary energy storage device, a secondary circulating fan and a secondary heat exchanger which are sequentially connected through pipelines, gas circularly flows in the secondary energy storage pipeline, a solid heat storage material and an electric heater are arranged in the secondary energy storage device, the electric heater is used for heating the solid heat storage material, the output end of the steam-water separator is connected with the input end of the secondary heat exchanger through a fourth pipeline, the output end of the secondary heat exchanger is connected with a steam turbine or a heat supply header through a fifth pipeline, and a second valve is arranged on the fifth pipeline; the controller is electrically connected with the secondary energy storage device, the secondary circulating fan and the electric heater respectively.
3. The energy storage peak shaving system of claim 2, wherein the steam delivery pipe is further provided with a first temperature detector, the first temperature detector is configured to detect a temperature of steam output from the output end of the primary heat exchanger, the controller is electrically connected to the first temperature detector, and the controller is configured to: Acquiring an actual steam temperature t 1 detected by the first temperature detector; Comparing the actual steam temperature t 1 with a preset steam temperature t 2 ; When t 1 ＞t 2 , opening the first valve, closing the second valve, and conveying the steam to a steam turbine or a heating header; And when t 1 ≤t 2 , opening the second valve, closing the first valve, and conveying the steam to the secondary heat exchanger for heat exchange.
4. The energy storage peak shaver system according to claim 2, wherein the solid heat storage material is concrete or inorganic silicate particles.
5. The energy storage peak shaving system of claim 2, wherein the primary energy storage pipeline and the secondary energy storage pipeline are respectively provided with a gas supplementing port, each gas supplementing port is respectively connected with a gas storage tank through an eighth pipeline, and a third valve is arranged on the eighth pipeline.
6. The energy storage peak shaving system of claim 5, wherein the primary energy storage pipeline and the secondary energy storage pipeline are respectively provided with a pressure detector, two pressure detectors are respectively used for detecting the gas pressure on the primary energy storage pipeline and the secondary energy storage pipeline, two pressure detectors are respectively electrically connected with the controller, and the controller is further configured to: Acquiring an actual gas pressure P 1 detected by the pressure detector; Comparing the actual gas pressure P 1 with a preset gas pressure P 2 ; When P 1 ＜P 2 is carried out, a third valve on the primary energy storage pipeline and/or the secondary energy storage pipeline is opened so as to communicate a gas supplementing port on the primary energy storage pipeline and/or the secondary energy storage pipeline with the gas storage tank; and when P 1 ≥P 2 is carried out, closing a third valve on the primary energy storage pipeline and/or the secondary energy storage pipeline.
7. The energy storage peak shaver system according to claim 1, wherein a fourth valve is arranged on the first pipeline; The energy storage peak shaving system further comprises a gas pressurization pipeline, wherein the gas pressurization pipeline comprises a condenser and a circulating pump which are sequentially connected through pipelines, the condenser is connected with the primary heat exchanger through a sixth pipeline, a fifth valve is arranged on the sixth pipeline, one end of the first pipeline is connected with the sixth pipeline, the other end of the first pipeline is connected with the heat collecting device, and the circulating pump is connected with the heat collecting device through a seventh pipeline.
8. The energy storage peak shaving system of claim 7, wherein a second temperature detector is further provided on the sixth conduit, the second temperature detector being located on the sixth conduit and configured to detect a temperature of the gas after heat exchange with the primary heat exchanger, the controller being electrically connected to the second temperature detector, the controller further configured to: acquiring an actual gas temperature t 3 detected by the second temperature detector; Comparing the actual gas temperature t 3 with a preset gas temperature t 4 ; When t 3 ＞t 4 , opening the fourth valve, conducting the first pipeline, and closing the fifth valve; and when t 3 ≤t 4 is carried out, closing the fourth valve, opening the fifth valve, conveying the gas into the condenser to be cooled to a liquid state, conveying the cooled liquid into the circulating pump to be pressurized into gas, and conveying the gas into the heat collecting device.
9. The energy storage peak shaving system of claim 1, wherein the heat collection device is a trough heat collector.
10. The energy storage peak shaving system of claim 1, further comprising a water pump, wherein two ends of the water pump are respectively connected with the steam-water separator and the primary heat exchanger through pipelines, the water pump is used for pumping liquid in the steam-water separator into the primary heat exchanger for heat exchange, and the water pump is electrically connected with the controller.

Description

Energy storage peak shaving system Technical Field The application relates to the technical field of deep peak shaving and energy storage of coal-fired power plants, in particular to an energy storage peak shaving system. Background With the large-scale network access of new energy power generation, the electric power system faces the serious challenges of efficient absorption and safe and stable operation of new energy due to the fluctuation and randomness of new energy resources such as wind, light and the like, weak disturbance resistance and low support of power generation equipment, and a high-proportion flexible power supply and energy storage capacity are urgently needed to improve the power supply structure and ensure the safety of a power grid. The prior art mainly carries out deep peak regulation transformation on main equipment of a coal-fired power station, and mostly adopts a fused salt heat storage peak regulation technology. For example, chinese patent application CN119393203a discloses a system and a method for peak regulation of heat storage and release by coupling steam and molten salt, and proposes a scheme for heat storage and release by coupling molten salt and steam, by splitting the main steam of a boiler into a heat storage and exchange system and combining a condensed water pipe and a heat release and exchange system, heat storage and release of molten salt are realized, and the stored heat is utilized to heat condensed water to prepare steam, which participates in the work of a steam turbine. The scheme has certain advantages in the aspects of energy storage capacity and peak shaving response, but because the molten salt is used as a heat storage medium, the whole manufacturing cost of the system is high, and the molten salt is easy to crystallize at low temperature, so that the complexity of operation control is increased, and the popularization of the system in a scene with high economic requirements is limited. In addition, the system does not effectively utilize renewable energy sources such as solar energy and the like, and cannot fully utilize plant resources. Disclosure of Invention The application aims to provide an energy storage peak shaving system, which adopts a solid heat storage material to replace molten salt so as to avoid the problem of complex system operation control caused by molten salt crystallization, and simultaneously utilizes solar energy to heat the solid energy storage material and fully utilizes plant resources. In order to achieve the above object, the present application provides an energy storage peak shaving system, comprising: The primary energy storage pipeline comprises a heat collection device, a primary energy storage device, a primary circulating fan and a primary heat exchanger which are sequentially connected through pipelines, gas circularly flows in the primary energy storage pipeline, the heat collection device is used for absorbing solar energy and converting the absorbed solar energy into heat energy so as to heat the gas flowing through the heat collection device, a solid heat storage material is arranged in the primary energy storage device, the primary heat exchanger is connected with the heat collection device through a first pipeline, the input end of the primary heat exchanger is connected with the output end of the generator set, and the primary heat exchanger is used for exchanging heat with condensed water flowing out of the output end of the generator set; The steam delivery pipeline is provided with a steam-water separator, the input end of the steam-water separator is connected with the output end of the primary heat exchanger through a second pipeline, the steam-water separator is used for separating water and steam output by the primary heat exchanger, the output end of the steam-water separator is connected with a steam turbine or a heat supply header through a third pipeline so as to deliver the separated steam to the steam turbine or the heat supply header, and the third pipeline is provided with a first valve; And the controller is respectively and electrically connected with the heat collecting device, the primary energy storage device, the primary circulating fan, the primary heat exchanger and the steam-water separator. The energy storage peak shaving system further comprises a secondary energy storage pipeline, wherein the secondary energy storage pipeline comprises a secondary energy storage device, a secondary circulating fan and a secondary heat exchanger which are sequentially connected through pipelines, gas circularly flows in the secondary energy storage pipeline, a solid heat storage material and an electric heater are arranged in the secondary energy storage device, the electric heater is used for heating the solid heat storage material, the output end of the steam-water separator is connected with the input end of the secondary heat exchanger through a fourth pipeline, the output end of the secondary heat