Dual bypass control extraction steam hybrid heat exchange frequency modulation system

Abstract

A double bypass control extraction steam type hybrid heat exchange frequency modulation system, including a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a condensate pump, a lower-level low-pressure heater, a first bypass controller connected to the lower-level low-pressure heater through a main pipeline, an upper-level low-pressure heater, a second bypass controller connected to the upper-level low-pressure heater through a main pipeline, a deaerator, a high-pressure heater directly connected to the deaerator through a pipeline, and a reheater whose inlet is connected to the second bypass controller through a pipeline and to the high-pressure cylinder through a steam pipeline, and whose outlet is connected to the medium-pressure cylinder through a steam pipeline. The present invention can quickly respond to the frequency modulation requirements of the power grid to the load changes of the unit, avoid frequent switching of the steam inlet automatic regulating valve during turbine frequency modulation, operate stably and reliably, ensure safe operation of the turbine, significantly improve the life and flexibility of the unit, save energy significantly, and have a large frequency modulation range. It can be widely used in the field of flexible frequency modulation of power plants.

Description

Technical Field

[0001] The invention relates to a double-bypass controlled steam extraction type hybrid heat exchange frequency modulation system, which can be widely used in the field of flexible frequency modulation of power plants. Background Art

[0002] With the adjustment of economic policies, my country's electricity consumption structure has changed, and the electricity demand on the user side is changing all the time. In addition, with the gradual improvement of environmental protection policies, the proportion of wind and solar renewable energy will be greatly increased, but renewable energy is unstable, and power plants are required to adjust the load size to ensure the balance of supply and demand of the power grid. In summary, due to the instantaneous imbalance between the supply and demand sides of the power grid, it is very easy to cause disturbances in the power grid and its frequency, and frequency is an important technical indicator for the safe and stable operation of the power system.

[0003] At present, power plants mainly respond to the frequency regulation needs of the power grid by increasing or decreasing the fuel of the boiler or adjusting the steam intake of the turbine, but the above measures have certain limitations, such as boiler delays and limited turbine regulation margins. In addition, there are many other frequency regulation methods, such as the energy storage frequency regulation method of batteries and heat storage tanks, and the energy conversion method of electrode boilers. The above methods have the problems of slow frequency regulation response speed, high investment cost and high operating cost. Summary of the invention

[0004] The purpose of the present invention is to provide a dual bypass controlled steam extraction hybrid heat exchange frequency modulation system which can quickly respond to the frequency modulation requirements of the power grid to changes in unit load, avoid frequent switching of the steam inlet automatic regulating valve during turbine frequency modulation, operate stably and reliably, ensure safe operation of the turbine, significantly improve the life and flexibility of the unit, significantly save energy, and have a large frequency modulation amplitude.

[0005] In order to achieve the above-mentioned purpose, the double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention includes 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, a first bypass controller connected to the lower-level low-pressure heater through a main pipeline, an upper-level low-pressure heater connected to the first bypass controller through the main pipeline, directly connected to the lower-level low-pressure heater through a drain pipeline, and directly connected to the intermediate-pressure cylinder through an intermediate-pressure cylinder steam extraction pipeline, a second bypass controller connected to the upper-level low-pressure heater through the main pipeline, a deaerator connected to the second bypass controller through a pipeline, a high-pressure heater directly connected to the deaerator through a pipeline, and a reheater whose inlet is connected to the second bypass controller through a pipeline and to the high-pressure cylinder through a steam pipeline, and whose outlet is connected to the intermediate-pressure cylinder through a steam pipeline.

[0006] The double bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention, the first bypass controller includes a first buffer tank with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a first lower booster pump located at the lower part of the first buffer tank, connected to the first buffer tank water discharge interface through a pipeline and connected to the drain pipeline through a pipeline, a first lower automatic regulating valve located at the lower part of the first buffer tank, connected to the first buffer tank steam inlet interface through a pipeline and connected to the medium pressure cylinder steam extraction pipeline through a pipeline, a first upper booster pump located above the first buffer tank liquid level, connected to the first buffer tank hot water interface through a pipeline, a first bypass automatic Shut-off valve, the first main automatic shut-off valve located on the main pipeline connecting the upper low-pressure heater and the lower low-pressure heater, the first upper automatic regulating valve connected between the inlet and outlet of the first main automatic shut-off valve through a pipeline, the first bypass automatic regulating valve connected to the cold water interface of the first buffer tank through a pipeline and to the main pipeline through the right bypass pipeline, one end of which is connected to the first branch automatic shut-off valve on the pipeline connecting the first upper booster pump outlet and the first bypass automatic shut-off valve, the first heat network circulation pump outlet connected to the first branch automatic shut-off valve through a pipeline, one end of which is connected to the first heat network circulation pump outlet through a pipeline and the other end of which is connected to the first branch automatic regulating valve on the pipeline connecting between the first buffer tank and the first bypass automatic regulating valve.

[0007] The double bypass control extraction steam hybrid heat exchange frequency modulation system of the present invention, the second bypass controller includes a second buffer tank with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a second lower booster pump located at the lower part of the second buffer tank, connected to the second buffer tank water discharge interface through a pipeline and connected to the deaerator through a pipeline, a second lower automatic regulating valve located at the lower part of the second buffer tank, connected to the second buffer tank steam inlet interface through a pipeline and connected to the high-pressure cylinder and the reheater through a pipeline, a second upper booster pump located above the second buffer tank liquid level, connected to the second buffer tank hot water interface through a pipeline, and a second bypass valve connected to the second upper booster pump through a pipeline and connected to the main pipeline through a left bypass pipeline. Automatic shut-off valve, the second main automatic shut-off valve located on the main pipeline connecting the upper low-pressure heater and the deaerator, the second upper automatic regulating valve connected between the inlet and outlet of the second main automatic shut-off valve through a pipeline, the second bypass automatic regulating valve connected to the cold water interface of the second buffer tank through a pipeline and to the main pipeline through the right bypass pipeline, one end of the second branch automatic shut-off valve connected to the pipeline between the second upper booster pump outlet and the second bypass automatic shut-off valve, the second heat network circulation pump outlet connected to the second branch automatic shut-off valve through a pipeline, one end of the second branch automatic regulating valve connected to the second heat network circulation pump outlet through a pipeline and the other end of the second branch automatic regulating valve connected to the pipeline between the second buffer tank and the second bypass automatic regulating valve.

[0008] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention, the first bypass controller also needs to maintain a basic load when not modulating the frequency, so as to achieve a rapid response of the frequency modulation.

[0009] The dual bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention, the second bypass controller also needs to maintain a basic load when not modulating the frequency, so as to achieve a rapid response of the frequency modulation.

[0010] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the heat exchange medium of the first bypass controller is boiler condensate or winter heating network circulating water.

[0011] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the heat exchange medium of the second bypass controller is boiler condensate or winter heating network circulating water.

[0012] The double bypass controlled steam extraction type mixed heat exchange frequency modulation system of the present invention, the first buffer tank is a mixed heat exchange, steam and water are directly mixed for heat exchange.

[0013] The double bypass controlled steam extraction type mixed heat exchange frequency modulation system of the present invention, the second buffer tank is a mixed heat exchange, steam and water are directly mixed for heat exchange.

[0014] In the double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the first buffer tank is a pressure tank or a normal pressure tank.

[0015] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the second buffer tank is a pressure tank or a normal pressure tank.

[0016] The dual bypass control steam extraction type hybrid heat exchange frequency modulation system of the present invention uses two bypass controllers to work together. When the grid frequency needs to be increased, that is, when the power plant power generation load needs to be increased, the bypass controller load needs to be reduced. The bypass controller extracts less steam, and more steam is used for steam turbine power generation, which can quickly increase the unit load and quickly respond to the requirements of increased grid frequency. Its specific working process is:

[0017] First, when the heat exchange medium is condensate, the main line automatic shut-off valve, branch line automatic regulating valve, and branch line automatic shut-off valve of the two bypass controllers are all in the closed state, and the bypass automatic shut-off valves of the two bypass controllers are in the open state. The valve opening of the lower automatic regulating valve of the two bypass controllers is reduced, reducing the steam extraction to the medium pressure cylinder. Due to the reduction in steam extraction, in order to maintain the liquid level in the buffer tank, the frequency of the lower booster pump needs to be reduced so that the water discharge of the buffer tank is equivalent to the steam extraction. Due to the reduction in steam extraction, in order to keep the condensate temperature in the buffer tank within the design value range, it is necessary to reduce the flow of condensate entering the buffer tank, increase the opening of the upper automatic regulating valve, and reduce the opening of the bypass automatic regulating valve. In order to maintain the water flow balance of the system, the frequency of the upper booster pump at the outlet of the buffer tank also needs to be reduced so that the hot water output of the buffer tank is equivalent to the cold water inlet.

[0018] Second, when the heat exchange medium is the heat network circulating water, the upper automatic regulating valve, bypass automatic regulating valve, and bypass automatic shut-off valve of the two bypass controllers are in the closed state, and the main automatic shut-off valve and branch automatic shut-off valve of the two bypass controllers are in the open state. The valve opening of the lower automatic regulating valve of the two bypass controllers is reduced, reducing the steam extraction to the medium pressure cylinder. Due to the reduction in steam extraction, in order to maintain the liquid level in the buffer tank, the frequency of the lower booster pump needs to be reduced so that the water discharge from the buffer tank is equivalent to the steam extraction. Due to the reduction in steam extraction, in order to keep the temperature of the heat network circulating water in the buffer tank within the design value range, it is necessary to reduce the flow of the heat network circulating water entering the buffer tank and reduce the opening of the branch automatic regulating valve. In order to maintain the balance of the heat network circulating water flow, the frequency of the upper booster pump at the buffer tank outlet also needs to be reduced so that the hot water output of the buffer tank is equivalent to the cold water inlet.

[0019] The dual bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention uses two bypass controllers to work together. When it is necessary to reduce the grid frequency, that is, to reduce the power plant power generation load, it is necessary to increase the bypass controller load. The bypass controller extracts more steam, reduces the steam used for steam turbine power generation, and the unit load drops quickly and responds quickly to the requirements of reducing the grid frequency. Its specific working process is:

[0020] First, when the heat exchange medium is condensate, the main line automatic shut-off valve, branch line automatic regulating valve, and branch line automatic shut-off valve of the two bypass controllers are in the closed state, and the bypass automatic shut-off valves of the two bypass controllers are in the open state. The lower automatic regulating valves of the two bypass controllers increase their valve openings, increasing the steam extraction to the intermediate pressure cylinder. As the steam extraction increases, in order to maintain the liquid level in the buffer tank, the frequency of the lower booster pump also needs to be increased so that the amount of water discharged from the buffer tank is equivalent to the amount of steam extraction. As the steam extraction increases, in order to keep the condensate temperature in the buffer tank at the design value, it is necessary to increase the flow of condensate entering the buffer tank, reduce the opening of the upper automatic regulating valve, and increase the opening of the bypass automatic regulating valve. In order to maintain the water flow balance of the main system, the frequency of the upper booster pump at the outlet of the buffer tank also needs to be increased so that the hot water output of the buffer tank is equivalent to the cold water inlet.

[0021] Second, when the heat exchange medium is the heat network circulating water, the upper automatic regulating valve, bypass automatic regulating valve, and bypass automatic shut-off valve of the two bypass controllers are in the closed state, and the main automatic shut-off valve and branch automatic shut-off valve of the two bypass controllers are in the open state. The valve opening of the lower automatic regulating valve of the two bypass controllers increases, and the steam extraction to the intermediate pressure cylinder increases. Due to the increase in the amount of steam extraction, in order to maintain the liquid level in the buffer tank, the frequency of the lower booster pump needs to be increased so that the amount of water discharged from the buffer tank is equivalent to the amount of steam extraction. Due to the increase in the amount of steam extraction, in order to keep the temperature of the heat network circulating water in the buffer tank at the design value, it is necessary to increase the flow of the heat network circulating water entering the buffer tank and increase the opening of the branch automatic regulating valve. In order to maintain the balance of the heat network circulating water flow of the main system, the frequency of the upper booster pump at the outlet of the buffer tank also needs to be increased so that the hot water output of the buffer tank is equivalent to the cold water inlet.

[0022] In the dual bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention, the capacity of the first or second buffer tank is designed according to the frequency modulation amplitude requirement of the power grid to meet the heat storage requirement. It is designed as a pressure tank or a normal pressure tank according to the steam temperature, pressure and inlet and outlet water temperature requirements. The drain pipe connected to the buffer tank drain interface is a drain pipe with the same quality as the steam extraction of the buffer tank or a drain pipe corresponding to the temperature and pressure of the drain port.

[0023] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention, the first or second main line automatic shut-off valve, bypass automatic shut-off valve, branch line automatic shut-off valve are electrically, pneumatically or hydraulically driven valves, which can automatically, quickly and reliably cut off the medium.

[0024] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention, the first or second lower automatic regulating valve, the bypass automatic regulating valve, the upper automatic regulating valve, the branch automatic regulating valve are electric, pneumatic or hydraulically driven valves, which can automatically, quickly and reliably adjust the medium flow.

[0025] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the first or second lower booster pump and the upper booster pump can automatically control and adjust the medium flow.

[0026] The dual bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention adopts two bypass controllers. Without changing the structure of the steam turbine and the opening of the steam inlet automatic regulating valve, it can directly increase or decrease the steam flow of the high and medium pressure cylinders of the extraction steam turbine, so as to quickly respond to the frequency modulation requirements of the power grid to the load changes of the unit, avoid frequent switching of the steam inlet automatic regulating valve during the frequency modulation of the steam turbine, operate stably and reliably, ensure the safe operation of the steam turbine, and significantly improve the life and flexibility of the unit.

[0027] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention can directly heat boiler condensate or hot network water with extracted steam, and the energy loss in the frequency modulation process is very small, almost no energy loss, and significant energy saving.

[0028] The double bypass control steam extraction type hybrid heat exchange frequency modulation system of the present invention adopts a double bypass controller and has the advantage of a large frequency modulation amplitude.

[0029] In summary, the dual bypass controlled extraction steam hybrid heat exchange frequency modulation system of the present invention can quickly respond to the frequency modulation requirements of the power grid for changes in unit load, avoid frequent switching of the steam inlet automatic regulating valve during turbine frequency modulation, operate stably and reliably, ensure safe operation of the turbine, significantly improve the life and flexibility of the unit, significantly save energy, and have a large frequency modulation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments thereof.

[0031] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0032] exist Figure 1In the invention, the double bypass controlled steam extraction type hybrid heat exchange frequency modulation system 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 low pressure heater 6 connected to the condensate pump through a pipeline, a first bypass controller 7 connected to the lower low pressure heater through a main pipeline 13, an upper low pressure heater 8 connected to the first bypass controller through the main pipeline, directly connected to the lower low pressure heater through a drain pipeline 14, and directly connected to the intermediate pressure cylinder through an intermediate pressure cylinder extraction pipeline 15, a second bypass controller 9 connected to the upper low pressure heater through the main pipeline, a deaerator 10 connected to the second bypass controller through a pipeline, a high pressure heater 11 directly connected to the deaerator through a pipeline, and a reheater 12 whose inlet is connected to the second bypass controller through a pipeline and to the high pressure cylinder through a steam pipeline, and whose outlet is connected to the intermediate pressure cylinder through a steam pipeline.

[0033] The double bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention, the first bypass controller 7, includes a first buffer tank 7-1 with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a first lower booster pump 7-2 located at the lower part of the first buffer tank, connected to the first buffer tank water discharge interface through a pipeline and connected to the drain pipeline through a pipeline, a first lower automatic regulating valve 7-3 located at the lower part of the first buffer tank, connected to the first buffer tank steam inlet interface through a pipeline and connected to the medium pressure cylinder steam extraction pipeline through a pipeline, a first upper booster pump 7-4 located above the first buffer tank liquid level, connected to the first buffer tank hot water interface through a pipeline, and a first bypass automatic shut-off valve 7- 5. The first main automatic shut-off valve 7-6 located on the main pipeline connecting the upper low-pressure heater and the lower low-pressure heater, the first upper automatic regulating valve 7-7 connected between the inlet and outlet of the first main automatic shut-off valve through a pipeline, the first bypass automatic regulating valve 7-8 connected to the cold water interface of the first buffer tank through a pipeline and to the main pipeline through a right bypass pipeline, the first branch automatic shut-off valve 7-9 connected at one end to the pipeline connecting the first upper booster pump outlet and the first bypass automatic shut-off valve, the first heat network circulation pump outlet 7-10 connected to the first branch automatic shut-off valve through a pipeline, and the first branch automatic regulating valve 7-11 connected at one end to the first heat network circulation pump outlet through a pipeline and at the other end to the first buffer tank and the first bypass automatic regulating valve.

[0034] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention, the second bypass controller 9, comprises a second buffer tank 9-1 with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a second lower booster pump 9-2 located at the lower part of the second buffer tank, connected to the second buffer tank water discharge interface through a pipeline and connected to the deaerator through a pipeline, a second lower automatic regulating valve 9-3 located at the lower part of the second buffer tank, connected to the second buffer tank steam inlet interface through a pipeline and connected to the high-pressure cylinder and the reheater through a pipeline, a second upper booster pump 9-4 located above the second buffer tank liquid level, connected to the second buffer tank hot water interface through a pipeline, and a second bypass automatic shut-off valve connected to the second upper booster pump through a pipeline and connected to the main pipeline through a left bypass pipeline 9-5, a second main automatic shut-off valve 9-6 located on the main pipeline connecting the upper low-pressure heater and the deaerator, a second upper automatic regulating valve 9-7 connected between the inlet and outlet of the second main automatic shut-off valve through a pipeline, a second bypass automatic regulating valve 9-8 connected to the cold water interface of the second buffer tank through a pipeline and to the main pipeline through a right bypass pipeline, a second branch automatic shut-off valve 9-9 connected at one end to the pipeline connecting the second upper booster pump outlet and the second bypass automatic shut-off valve, a second heat network circulation pump outlet 9-10 connected to the second branch automatic shut-off valve through a pipeline, a second branch automatic regulating valve 9-11 connected at one end to the second heat network circulation pump outlet through a pipeline and at the other end to the pipeline connecting the second buffer tank and the second bypass automatic regulating valve.

[0035] The double bypass controlled steam extraction hybrid heat exchange frequency modulation system of the present invention, the first bypass controller also needs to maintain a basic load when not modulating the frequency, so as to achieve a rapid response of the frequency modulation.

[0036] The dual bypass control steam extraction hybrid heat exchange frequency modulation system of the present invention, the second bypass controller also needs to maintain a basic load when not modulating the frequency, so as to achieve a rapid response of the frequency modulation.

[0037] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the heat exchange medium of the first bypass controller is boiler condensate or winter heating network circulating water.

[0038] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the heat exchange medium of the second bypass controller is boiler condensate or winter heating network circulating water.

[0039] The double bypass controlled steam extraction type mixed heat exchange frequency modulation system of the present invention, the first buffer tank is a mixed heat exchange, steam and water are directly mixed for heat exchange.

[0040] The double bypass controlled steam extraction type mixed heat exchange frequency modulation system of the present invention, the second buffer tank is a mixed heat exchange, steam and water are directly mixed for heat exchange.

[0041] In the double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the first buffer tank is a pressure tank or a normal pressure tank.

[0042] The double bypass controlled steam extraction type hybrid heat exchange frequency modulation system of the present invention, the second buffer tank is a pressure tank or a normal pressure tank.

[0043] 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 double bypass control steam extraction hybrid heat exchange frequency modulation system, characterized in that: It includes 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, a first bypass controller connected to the lower-level low-pressure heater through a main pipeline, an upper-level low-pressure heater connected to the first bypass controller through the main pipeline, directly connected to the lower-level low-pressure heater through a drain pipeline, and directly connected to the intermediate-pressure cylinder through an intermediate-pressure cylinder extraction pipeline, a second bypass controller connected to the upper-level low-pressure heater through the main pipeline, a deaerator connected to the second bypass controller through a pipeline, a high-pressure heater directly connected to the deaerator through a pipeline, and a reheater whose inlet is connected to the second bypass controller through a pipeline and to the high-pressure cylinder through a steam pipeline, and whose outlet is connected to the intermediate-pressure cylinder through a steam pipeline.

2. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The first bypass controller comprises a first buffer tank with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a first lower booster pump located at the lower part of the first buffer tank, connected to the first buffer tank water discharge interface through a pipeline and connected to the drain pipeline through a pipeline, a first lower automatic regulating valve located at the lower part of the first buffer tank, connected to the first buffer tank steam inlet interface through a pipeline and connected to the medium-pressure cylinder steam extraction pipeline through a pipeline, a first upper booster pump located above the first buffer tank liquid level, connected to the first buffer tank hot water interface through a pipeline, a first bypass automatic shut-off valve connected to the first upper booster pump through a pipeline and connected to the main pipeline through a left bypass pipeline, and a first lower booster pump located at the upper low-pressure The first main automatic shut-off valve on the main pipeline connecting the heater and the lower low-pressure heater, the first upper automatic regulating valve connected between the inlet and outlet of the first main automatic shut-off valve through a pipeline, the first bypass automatic regulating valve connected to the cold water interface of the first buffer tank through a pipeline and to the main pipeline through the right bypass pipeline, one end of which is connected to the first branch automatic shut-off valve on the pipeline connecting between the first upper booster pump outlet and the first bypass automatic shut-off valve, the first heat network circulation pump outlet connected to the first branch automatic shut-off valve through a pipeline, one end is connected to the first heat network circulation pump outlet through a pipeline and the other end is connected to the first branch automatic regulating valve on the pipeline connecting between the first buffer tank and the first bypass automatic regulating valve.

3. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The second bypass controller includes a second buffer tank with a steam inlet interface and a water discharge interface at the bottom, and a cold water interface and a hot water interface in the middle, a second lower booster pump located at the lower part of the second buffer tank, connected to the second buffer tank water discharge interface through a pipeline and connected to the deaerator through a pipeline, a second lower automatic regulating valve located at the lower part of the second buffer tank, connected to the second buffer tank steam inlet interface through a pipeline and connected to the high-pressure cylinder and the reheater through a pipeline, a second upper booster pump located above the second buffer tank liquid level and connected to the second buffer tank hot water interface through a pipeline, a second bypass automatic shut-off valve connected to the second upper booster pump through a pipeline and connected to the main pipeline through a left bypass pipeline, and a second bypass automatic shut-off valve located at the upper The second main automatic shut-off valve on the main pipeline connecting the low-pressure heater and the deaerator, the second upper automatic regulating valve connected between the inlet and outlet of the second main automatic shut-off valve through a pipeline, the second bypass automatic regulating valve connected to the cold water interface of the second buffer tank through a pipeline and to the main pipeline through the right bypass pipeline, one end of which is connected to the second branch automatic shut-off valve on the pipeline connecting the second upper booster pump outlet and the second bypass automatic shut-off valve, the second heat network circulation pump outlet connected to the second branch automatic shut-off valve through a pipeline, one end is connected to the second heat network circulation pump outlet through a pipeline and the other end is connected to the second branch automatic regulating valve on the pipeline connecting between the second buffer tank and the second bypass automatic regulating valve.

4. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The first bypass controller needs to maintain a basic load even when the frequency is not adjusted to achieve a fast response of the frequency regulation.

5. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The second bypass controller is also required to maintain a basic load when the frequency is not regulated to achieve a fast response of the frequency regulation.

6. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The heat exchange medium of the first bypass controller is boiler condensate or winter heating network circulating water.

7. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1 is characterized in that: The heat exchange medium of the second bypass controller is boiler condensate or winter heating network circulating water.

8. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 2 is characterized in that: The first buffer tank is a mixed heat exchanger, in which steam and water are directly mixed for heat exchange.

9. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 3 is characterized in that: The second buffer tank is a mixed heat exchanger, where steam and water are directly mixed for heat exchange.

10. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 2, characterized in that: The first buffer tank is a pressure tank or a normal pressure tank.

11. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 3, characterized in that: The second buffer tank is a pressure tank or a normal pressure tank.

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