Rapid frequency regulation system for water and steam supply of heat storage device

Abstract

A heat accumulator water supply and steam supply type rapid frequency modulation system includes a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a condensate pump, a lower low-pressure heater, an upper low-pressure heater, a deaerator, a high-pressure heater, a low-temperature reheater, a reheat steam cold section regulating valve, a heat accumulator connected to the reheat steam cold section regulating valve through a pipeline, a medium-pressure cylinder extraction regulating valve, a steam supply side regulating valve connected to the upper part of the heat accumulator through a pipeline, an electric reheater connected to the steam supply side regulating valve through a pipeline, a steam heat user side manual shut-off valve connected to the electric reheater through a pipeline to control the steam user supply, and a hot water user supply device connected to the lower side of the heat accumulator. The heat accumulator water supply and steam supply type rapid frequency modulation system of the present invention can meet the rapid frequency modulation requirements of the power grid, improve the economic efficiency of the 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 supply and steam supply type rapid frequency regulation system, which can be widely used in the field of power plant frequency regulation. 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 supply and steam supply type 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 supply and steam supply type 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 connected 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, and a deaerator connected to the deaerator through a pipeline and to the third drain pipeline. A high-pressure heater connected to the deaerator through a 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 connected to the reheat steam cold section regulating valve through a pipeline, an intermediate-pressure cylinder extraction regulating valve connected to the pipeline between the reheat steam cold section regulating valve and the heat accumulator at one end through a pipeline and to the intermediate-pressure cylinder extraction pipeline at the other end through a pipeline, a steam supply side regulating valve connected to the upper part of the heat accumulator through a pipeline, an electric reheater connected to the steam supply side regulating valve through a pipeline, a steam heat user side manual shut-off valve connected to the electric reheater through a pipeline to control the steam supply to the user, and a hot water user supply device connected to the lower side of the heat accumulator.

[0005] The heat accumulator water supply and steam supply type rapid frequency modulation system of the present invention, the hot water user supply device comprises a hot water return side regulating valve connected to the hot water return port on the lower side of the heat accumulator through a pipeline, a hot water return side manual shut-off valve connected to the hot water return side regulating valve through a pipeline and controlling the return of hot water to the hot water user, a hot water supply side regulating valve located above the hot water return port of the heat accumulator and connected to the hot water supply port on the side of the heat accumulator through a pipeline, and a hot water supply side manual shut-off valve connected to the hot water supply side regulating valve through a pipeline and controlling the supply of hot water to the hot water user.

[0006] The working principle of the heat accumulator water supply and steam supply type 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 steam 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 steam extraction flow rate to increase the output power of the steam turbine; when it is necessary to reduce the grid frequency, increase the steam 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 supply and steam supply type rapid frequency modulation system of the present invention, the heat accumulator can store the extracted steam and continuously supply the steam user to use, playing the role of storage and buffering. Therefore, the heat accumulator is used to store the steam to improve the steam utilization rate.

[0008] The heat accumulator water supply and steam supply type 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.

[0009] The heat accumulator water supply and steam supply type 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.

[0010] The heat accumulator water supply and steam supply type rapid frequency modulation system of the present invention, when the heat accumulator capacity is large, can also provide hot water under the condition of ensuring the steam demand of the user. The water side of the heat accumulator forms a closed circulation system, hot water flows out of the heat accumulator, and the return water flows into the heat accumulator to perform heat exchange with the user side.

[0011] The heat storage water supply and steam supply type 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.

[0012] In summary, the heat accumulator water supply and steam supply type 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 rate, and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments thereof.

[0014] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0015] exist Figure 1 The heat accumulator water supply and steam supply type 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 18, 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 19 and to the intermediate-pressure cylinder through an intermediate-pressure cylinder extraction pipeline 20, a deaerator 8 connected to the upper-level low-pressure heater through a pipeline, and a deaerator 8 connected to the deaerator through a pipeline and to the deaerator through a third drain pipeline 21. a high-pressure heater 9 connected to an oxygenator, a low-temperature reheater 10 connected to the high-pressure cylinder pipeline through a 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 connected to the reheat steam cold section regulating valve through a pipeline, an intermediate-pressure cylinder extraction regulating valve 13 connected to the pipeline between the reheat steam cold section regulating valve and the heat accumulator at one end through a pipeline and connected to the intermediate-pressure cylinder extraction pipeline at the other end through a pipeline, a steam supply side regulating valve 14 connected to the upper part of the heat accumulator through a pipeline, an electric reheater 15 connected to the steam supply side regulating valve through a pipeline, a steam heat user-side manual shut-off valve 16 connected to the electric reheater through a pipeline to control the steam supply to the user, and a hot water user supply device 17 connected to the lower side of the heat accumulator.

[0016] The heat accumulator water supply and steam supply type rapid frequency modulation system of the present invention, the hot water user supply device 17, includes a hot water return side regulating valve 17-1 connected to the hot water return port on the lower side of the heat accumulator through a pipeline, a hot water return side manual shut-off valve 17-2 connected to the hot water return side regulating valve through a pipeline and controlling the return of hot water to the hot water user, a hot water supply side regulating valve 17-3 located at the upper part of the hot water return port of the heat accumulator and connected to the hot water supply port on the side of the heat accumulator through a pipeline, and a hot water supply side manual shut-off valve 17-4 connected to the hot water supply side regulating valve through a pipeline and controlling the supply of hot water to the hot water user.

[0017] 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 heat storage water and steam supply type rapid frequency modulation system, characterized in that: The steam turbine comprises 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, and 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 connected to the reheat steam cold section regulating valve through a pipeline, an intermediate-pressure cylinder extraction regulating valve connected to the pipeline between the reheat steam cold section regulating valve and the heat accumulator at one end through a pipeline and to the intermediate-pressure cylinder extraction pipeline at the other end through a pipeline, a steam supply side regulating valve connected to the upper part of the heat accumulator through a pipeline, an electric reheater connected to the steam supply side regulating valve through a pipeline, a steam heat user side manual shut-off valve connected to the electric reheater through a pipeline to control the steam supply to the user, and a hot water user supply device connected to the lower side of the heat accumulator.

2. The heat storage water and steam supply type rapid frequency modulation system according to claim 1 is characterized in that: The hot water user supply device includes a hot water return side regulating valve connected to the hot water return port on the lower side of the heat accumulator through a pipeline, a hot water return side manual shut-off valve connected to the hot water return side regulating valve through a pipeline and controlling the return of hot water to the hot water user, a hot water supply side regulating valve located above the hot water return port of the heat accumulator and connected to the hot water supply port on the side of the heat accumulator through a pipeline, and a hot water supply side manual shut-off valve connected to the hot water supply side regulating valve through a pipeline and controlling the supply of hot water to the hot water user.

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