Rapid frequency regulation system for heat storage water circuit control

Abstract

A heat accumulator water circuit regulation and rapid frequency modulation system comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a condensate pump, a lower-level low-pressure heater, an upper-level low-pressure heater, a deaerator connected to the upper-level low-pressure heater through a pipeline, a high-pressure heater connected to the deaerator through a pipeline and to the deaerator through a third drain pipeline, a low-temperature reheater connected to the high-pressure cylinder pipeline through a pipeline, a reheat steam cold section regulating valve connected to the low-temperature reheater and the high-pressure cylinder through a pipeline, a heat accumulator, a heat accumulator water circuit regulator, a steam supply side regulating valve, an electric reheater connected to the steam supply side regulating valve through a pipeline, and a steam heat user side manual shut-off valve connected to the electric reheater through a pipeline to control the steam user supply. The present invention can meet the demand for rapid frequency modulation of the power grid, improve the economic efficiency of unit operation, use the heat accumulator to store steam, improve steam utilization, and save energy. It can be widely used in the field of power plant frequency modulation.

Description

Technical Field

[0001] The invention relates to a heat accumulator water circuit control rapid frequency modulation system, which can be widely used in the field of power plant frequency modulation. Background Art

[0002] The stability and accuracy of the power supply frequency of the power grid are important indicators of power supply quality. When the total active power produced by the generator sets in the power grid is greater than the total power consumed by the power grid, the power supply frequency increases, and vice versa. The change and deviation of the power grid frequency have a great impact and harm on users and prime movers. The frequency modulation process is the process of adjusting the energy balance in the power production process. Through frequency modulation, the energy supply of various energy storage and thermal systems is mobilized to achieve the energy balance between power generation and power consumption, and realize the reasonable distribution of power load. Summary of the invention

[0003] The purpose of the present invention is to provide a heat accumulator water circuit control rapid frequency regulation system which can meet the rapid frequency regulation requirements of the power grid, improve the economic efficiency of unit operation, store steam by using a heat accumulator, improve steam utilization, and save energy.

[0004] In order to achieve the above-mentioned purpose, the heat accumulator water circuit control rapid frequency modulation system of the present invention includes a high-pressure cylinder, a medium-pressure cylinder connected to the high-pressure cylinder through a pipeline, a low-pressure cylinder connected to the medium-pressure cylinder through a pipeline, a condenser connected to the low-pressure cylinder through a pipeline, a condensate pump connected to the condenser through a pipeline, a lower-level low-pressure heater connected to the condensate pump through a pipeline and to the condenser through a first drain pipeline, an upper-level low-pressure heater connected to the lower-level low-pressure heater through a pipeline and to the lower-level low-pressure heater through a second drain pipeline and to the medium-pressure cylinder through a medium-pressure cylinder extraction pipeline, a deaerator connected to the upper-level low-pressure heater through a pipeline, a high-pressure heater connected to the deaerator through a pipeline and to the deaerator through a third drain pipeline, and a A low-temperature reheater connected to the high-pressure cylinder pipeline through a pipeline, a reheat steam cold section regulating valve connected to the low-temperature reheater and the high-pressure cylinder through a pipeline, a heat accumulator provided with a cold water inlet at the bottom, a hot water inlet at the top and a steam inlet at the top and connected to the reheat steam cold section regulating valve through a pipeline, a heat accumulator water circuit regulator connected to the pipeline between the deaerator and the upper low-pressure heater through a pipeline, to the pipeline between the upper low-pressure heater and the lower low-pressure heater through a pipeline, and connected to the cold water inlet and hot water inlet of the heat accumulator through a pipeline, a steam supply side regulating valve connected to the top of the heat accumulator through a pipeline, an electric reheater connected to the steam supply side regulating valve through a pipeline, and a manual shut-off valve on the steam user side connected to the electric reheater through a pipeline to control the steam heat supplied to the steam user.

[0005] The heat accumulator water circuit regulation and rapid frequency modulation system of the present invention, the heat accumulator water circuit regulator, includes a heat accumulator cold water side regulating valve connected to the cold water port at the bottom of the heat accumulator through a pipeline, a cold water side electric shut-off valve connected to the cold water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the lower low-pressure heater and the upper low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve connected to the upper hot water port of the heat accumulator through a pipeline, a hot water side electric shut-off valve connected to the hot water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the deaerator and the upper low-pressure heater through a pipeline, and a A first electric valve having one end connected to the cold water outlet at the bottom of the heat accumulator, a second electric valve connected to the first electric valve through a pipeline and to the hot water outlet at the top of the heat accumulator through a pipeline, a third electric valve having one end connected to the pipeline between the cold water side regulating valve and the cold water side electric shut-off valve of the heat accumulator, a fourth electric valve having one end connected to the third electric valve through a pipeline and the other end connected to the pipeline between the hot water side regulating valve and the hot water side electric shut-off valve of the heat accumulator, and a circulating water pump having one end connected to the pipeline between the first electric valve and the second electric valve and the other end connected to the pipeline between the third electric valve and the fourth electric valve.

[0006] The working principle of the heat accumulator water circuit control rapid frequency regulation system of the present invention is: when operating at basic load, open the reheat steam cold section regulating valve or the medium pressure cylinder extraction regulating valve, extract steam from the reheat steam cold section or the medium pressure cylinder, and provide steam to the user through the steam supply side regulating valve. If the user needs superheated steam, open the electric reheater, and the saturated steam is heated to superheated steam for use by the user. If the user needs saturated steam, close the electric reheater. When it is necessary to increase the grid frequency, reduce the extraction flow rate to increase the output power of the steam turbine; when it is necessary to reduce the grid frequency, increase the extraction flow rate to reduce the output power of the steam turbine. Therefore, it can meet the grid's rapid frequency regulation needs and improve the unit's operating economy.

[0007] The heat accumulator water circuit regulation and rapid frequency modulation system of the present invention, the heat accumulator water circuit regulator, its working process is:

[0008] (1) When the steam extraction volume is too large, resulting in insufficient capacity of the heat accumulator, the heat in the heat accumulator needs to be released. The cold water side electric shut-off valve and the heat accumulator cold water side regulating valve are opened, and the cold water at the outlet of the lower low-pressure heater flows into the heat accumulator. When the first electric valve, the third electric valve, and the heat accumulator hot water side regulating valve are closed, the hot water in the heat accumulator flows into the outlet of the upper low-pressure heater after passing through the second electric valve, the circulating water pump, the fourth electric valve, and the hot water side electric shut-off valve.

[0009] (2) When the steam extraction is insufficient, it is necessary to add heat to the heat accumulator. That is, open the hot water side electric shut-off valve and the heat accumulator hot water side regulating valve, and the hot water at the outlet of the upper low-pressure heater will flow into the heat accumulator. When the fourth electric valve, the second electric valve, and the heat accumulator cold water side regulating valve are closed, the cold water in the heat accumulator flows into the outlet of the lower low-pressure heater after passing through the first electric valve, the circulating water pump, the third electric valve, and the cold water side electric shut-off valve.

[0010] The invention discloses a heat accumulator water circuit regulation and rapid frequency modulation system, wherein the heat accumulator water circuit regulator shares a circulating water pump, a first electric valve, a second electric valve, a third electric valve and a fourth electric valve in the heat release and heat storage processes.

[0011] The heat accumulator water circuit regulation and rapid frequency modulation system of the present invention, the heat accumulator can store the extracted steam and continuously supply the steam user, playing the role of storage and buffering. Therefore, the heat accumulator is used to store the steam to improve the steam utilization rate.

[0012] The heat accumulator water circuit control rapid frequency modulation system of the present invention operates at a fixed basic load, that is, the frequency modulation steam extraction system extracts steam at a fixed flow rate. This basic load should be determined after comprehensive consideration of the reheat steam cold section flow rate, the medium pressure cylinder steam extraction flow rate and the frequency modulation range under low load conditions.

[0013] The heat accumulator water circuit control rapid frequency modulation system of the present invention can directly use the steam stored in the heat accumulator if the user needs saturated steam; if the user needs superheated steam, the steam in the heat accumulator needs to be heated by an electric heater before being used by the user.

[0014] The heat accumulator water circuit control rapid frequency modulation system of the present invention realizes the steam extraction path of rapid frequency modulation, which can be either the reheat steam cold section steam extraction or the intermediate pressure cylinder steam extraction, or a combination of the two. The two-way steam extraction can meet the flow requirements and achieve the purpose of energy saving.

[0015] In summary, the heat accumulator water circuit control rapid frequency regulation system of the present invention can meet the rapid frequency regulation requirements of the power grid, improve the economic efficiency of unit operation, use the heat accumulator to store steam, improve steam utilization, and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments thereof.

[0017] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0018] exist Figure 1The heat accumulator water circuit regulation and rapid frequency modulation system of the present invention comprises a high-pressure cylinder 1, an intermediate-pressure cylinder 2 connected to the high-pressure cylinder through a pipeline, a low-pressure cylinder 3 connected to the intermediate-pressure cylinder through a pipeline, a condenser 4 connected to the low-pressure cylinder through a pipeline, a condensate pump 5 connected to the condenser through a pipeline, a lower-level low-pressure heater 6 connected to the condensate pump through a pipeline and to the condenser through a first drain pipeline, an upper-level low-pressure heater 7 connected to the lower-level low-pressure heater through a pipeline and to the lower-level low-pressure heater through a second drain pipeline and to the intermediate-pressure cylinder through an intermediate-pressure cylinder extraction pipeline, a deaerator 8 connected to the upper-level low-pressure heater through a pipeline, a high-pressure heater 9 connected to the deaerator through a pipeline and to the deaerator through a third drain pipeline, and a high-pressure heater 10 connected to the high-pressure cylinder 11 through a pipeline. A low-temperature reheater 10 connected to the cylinder pipeline, a reheat steam cold section regulating valve 11 connected to the low-temperature reheater and the high-pressure cylinder through a pipeline, a heat accumulator 12 provided with a cold water inlet at the bottom, a hot water inlet at the top and a steam inlet at the top and connected to the reheat steam cold section regulating valve through a pipeline, a heat accumulator water circuit regulator 13 connected to the pipeline between the deaerator and the upper low-pressure heater, and to the pipeline between the upper low-pressure heater and the lower low-pressure heater through a pipeline, and connected to the cold water inlet and hot water inlet of the heat accumulator through a pipeline, a steam supply side regulating valve 14 connected to the top of the heat accumulator through a pipeline, an electric reheater 15 connected to the steam supply side regulating valve through a pipeline, and a steam heat user-side manual shut-off valve 16 connected to the electric reheater through a pipeline to control the steam user's supply.

[0019] The heat accumulator water circuit regulation and rapid frequency modulation system of the present invention, the heat accumulator water circuit regulator 13, includes a heat accumulator cold water side regulating valve 13-1 connected to the cold water port at the bottom of the heat accumulator through a pipeline, a cold water side electric shut-off valve 13-2 connected to the cold water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the lower low-pressure heater and the upper low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve 13-3 connected to the hot water port at the top of the heat accumulator through a pipeline, a hot water side electric shut-off valve 13-4 connected to the hot water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the deaerator and the upper low-pressure heater through a pipeline, and one end A first electric valve 13-5 connected to the cold water inlet at the bottom of the heat accumulator, a second electric valve 13-6 connected to the first electric valve through a pipeline and to the hot water inlet at the top of the heat accumulator through a pipeline, a third electric valve 13-7 connected at one end to the pipeline between the cold water side regulating valve and the cold water side electric shut-off valve of the heat accumulator, a fourth electric valve 13-8 connected at one end to the third electric valve through a pipeline and at the other end to the pipeline between the hot water side regulating valve and the hot water side electric shut-off valve of the heat accumulator, and a circulating water pump 13-9 connected at one end to the pipeline between the first electric valve and the second electric valve and at the other end to the pipeline between the third electric valve and the fourth electric valve.

[0020] To sum up, the above only describes the preferred embodiments of the present invention. It should be pointed out that the present invention is not limited to the above-mentioned specific implementation modes, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art, without departing from the scope of the technical solution of the present invention, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A rapid frequency modulation system for regulating water circuit of a heat storage device, characterized in that: The invention comprises a high-pressure cylinder, an intermediate-pressure cylinder connected to the high-pressure cylinder through a pipeline, a low-pressure cylinder connected to the intermediate-pressure cylinder through a pipeline, a condenser connected to the low-pressure cylinder through a pipeline, a condensate pump connected to the condenser through a pipeline, a lower-level low-pressure heater connected to the condensate pump through a pipeline and to the condenser through a first drain pipeline, an upper-level low-pressure heater connected to the lower-level low-pressure heater through a pipeline and to the lower-level low-pressure heater through a second drain pipeline and to the intermediate-pressure cylinder through an intermediate-pressure cylinder extraction pipeline, a deaerator connected to the upper-level low-pressure heater through a pipeline, a high-pressure heater connected to the deaerator through a pipeline and to the deaerator through a third drain pipeline, and a low-pressure heater connected to the high-pressure cylinder pipeline through a pipeline. A low-temperature reheater, a reheat steam cold section regulating valve connected to the low-temperature reheater and the high-pressure cylinder through pipelines, a heat accumulator provided with a cold water inlet at the bottom, a hot water inlet at the top and a steam inlet at the top and connected to the reheat steam cold section regulating valve through pipelines, a heat accumulator water circuit regulator connected to the pipeline between the deaerator and the upper low-pressure heater, to the pipeline between the upper low-pressure heater and the lower low-pressure heater, and connected to the cold water inlet and hot water inlet of the heat accumulator through pipelines, a steam supply side regulating valve connected to the top of the heat accumulator through pipelines, an electric reheater connected to the steam supply side regulating valve through pipelines, and a manual shut-off valve on the user side of the steam heat connected to the electric reheater through pipelines to control the steam user's supply.

2. The rapid frequency modulation system for regulating water circuit of heat storage device according to claim 1 is characterized in that: The heat accumulator water circuit regulator includes a heat accumulator cold water side regulating valve connected to the cold water port at the bottom of the heat accumulator through a pipeline, a cold water side electric shut-off valve connected to the cold water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the lower low-pressure heater and the upper low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve connected to the upper hot water port of the heat accumulator through a pipeline, a hot water side electric shut-off valve connected to the hot water side regulating valve of the heat accumulator through a pipeline and connected to the pipeline between the deaerator and the upper low-pressure heater through a pipeline, one end of which is connected to the cold water port at the bottom of the heat accumulator a first electric valve connected to the hot water outlet of the heat accumulator, a second electric valve connected to the first electric valve through a pipeline and to the hot water outlet on the upper part of the heat accumulator through a pipeline, a third electric valve connected to the pipeline between the cold water side regulating valve and the cold water side electric shut-off valve of the heat accumulator at one end, a fourth electric valve connected to the pipeline between the hot water side regulating valve and the hot water side electric shut-off valve of the heat accumulator at one end, and a circulating water pump connected to the pipeline between the first electric valve and the second electric valve at one end and the pipeline between the third electric valve and the fourth electric valve at the other end.

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