阅读说明：本技术 双旁路控制抽汽式混合换热调频系统 (Double-bypass control steam extraction type mixed heat exchange frequency modulation system ) 是由 张洪涛 傅吉收 王勇 赵明星 吴永凯 娄扬 于 2021-09-30 设计创作，主要内容包括：一种双旁路控制抽汽式混合换热调频系统,包括高压缸,中压缸,低压缸,凝汽器,凝结水泵,下级低压加热器,通过主管道与下级低压加热器相连接的第一个旁路控制器,上级低压加热器,通过主管道与上级低压加热器相连接的第二个旁路控制器,除氧器,通过管道与除氧器直接相连接的高压加热器,入口既通过管道与第二个旁路控制器相连接又通过蒸汽管道与高压缸相连接、出口通过蒸汽管道与中压缸相连接的再热器。本发明快速实现响应电网对机组负荷变化的调频要求,避免汽轮机调频时进蒸汽自动调节阀的频繁开关,运行稳定可靠,保证汽轮机安全运行,显著提高机组寿命及灵活性,节能显著,调频幅度大。可广泛应用于电厂灵活性调频领域中。(The utility model provides a two bypass control steam extraction formula mix heat transfer frequency modulation system, including the high pressure jar, the intermediate pressure jar, the low pressure jar, the condenser, condensate pump, subordinate's low pressure heater, the first bypass controller that is connected with subordinate's low pressure heater through the trunk line, higher level's low pressure heater, the second bypass controller that is connected with higher level's low pressure heater through the trunk line, the oxygen-eliminating device, the high pressure heater who directly is connected through pipeline and oxygen-eliminating device, the entry both is connected with second bypass controller through the pipeline and is connected with the high pressure jar through the steam conduit, the export passes through the reheater that steam conduit and intermediate pressure jar are connected. The invention can quickly respond the frequency modulation requirement of the power grid on the load change of the unit, avoid frequent switching of the automatic steam inlet regulating valve during the frequency modulation of the steam turbine, ensure the safe operation of the steam turbine, obviously improve the service life and flexibility of the unit, save energy and have large frequency modulation amplitude. The method can be widely applied to the field of flexible frequency modulation of power plants.)

1. A double-bypass control steam extraction type mixed heat exchange frequency modulation system is characterized by comprising a high-pressure cylinder, a medium-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the medium-pressure cylinder through a pipeline, a condenser connected with the low-pressure cylinder through a pipeline, a condensate pump connected with the condenser through a pipeline, a subordinate low-pressure heater connected with the condensate pump through a pipeline, a first bypass controller connected with the subordinate low-pressure heater through a main pipeline, a superior low-pressure heater which is connected with the first bypass controller through the main pipeline, directly connected with the subordinate low-pressure heater through a drain pipeline and directly connected with the medium-pressure cylinder through a steam extraction pipeline of the medium-pressure cylinder, a second bypass controller connected with the superior low-pressure heater through the main pipeline, and a deaerator connected with the second bypass controller through a pipeline, the high-pressure heater is directly connected with the deaerator through a pipeline, and the inlet of the high-pressure heater is connected with the second bypass controller through a pipeline and is also connected with the high-pressure cylinder through a steam pipeline, and the outlet of the high-pressure heater is connected with the intermediate pressure cylinder through a steam pipeline.

2. The dual bypass control steam extraction type mixed heat exchange frequency modulation system according to claim 1, wherein the first bypass controller comprises a first buffer tank having a steam inlet and a water outlet at the bottom and a cold water and hot water inlet at the middle, a first lower booster pump located at the lower part of the first buffer tank and connected to the water outlet of the first buffer tank through a pipe and to a drain pipe through a pipe, a first lower automatic regulating valve located at the lower part of the first buffer tank and connected to the steam inlet of the first buffer tank through a pipe and to the steam extraction pipe of the intermediate pressure cylinder through a pipe, a first upper booster pump located at the upper part of the liquid level of the first buffer tank and connected to the hot water inlet of the first buffer tank through a pipe, and a first bypass automatic shutoff valve connected to the main pipe through a pipe and a left bypass pipe, a first main path automatic shutoff valve positioned on the main pipeline connecting the upper low pressure heater and the lower low pressure heater, a first upper part automatic regulating valve connected between the inlet and the outlet of the first main part automatic shutoff valve through a pipeline, a first bypass automatic regulating valve connected with the cold water interface of the first buffer tank through a pipeline and the main pipeline through a right bypass pipeline, a first branch automatic shutoff valve with one end connected on the connecting pipeline between the outlet of the first upper part booster pump and the first bypass automatic shutoff valve, the outlet of the first heat supply network circulating pump is connected with the first branch automatic shutoff valve through a pipeline, one end of the first branch automatic regulating valve is connected with the outlet of the first heat supply network circulating pump through a pipeline, and the other end of the first branch automatic regulating valve is connected to the connecting pipeline between the first buffer tank and the first bypass automatic regulating valve.

3. The dual bypass control steam extraction type hybrid heat exchange frequency modulation system according to claim 1, wherein the second bypass controller comprises a second buffer tank having a steam inlet and a water outlet at the bottom thereof and a cold water inlet and a hot water inlet at the middle thereof, a second lower booster pump located at the lower portion of the second buffer tank and connected to the water outlet of the second buffer tank through a pipe and to the deaerator through a pipe, a second lower automatic regulating valve located at the lower portion of the second buffer tank and connected to the steam inlet of the second buffer tank through a pipe and to the high pressure cylinder and the reheater through a pipe, a second upper booster pump located at the upper portion of the second buffer tank and connected to the hot water inlet of the second buffer tank through a pipe, a second bypass automatic shutoff valve connected to the main pipe through a pipe and to the upper booster pump through a pipe, the second main automatic shutoff valve is positioned on a main pipeline connected with the deaerator by a higher-level low-pressure heater, the second upper automatic regulating valve is connected between the inlet and the outlet of the second main automatic shutoff valve by a pipeline, the second bypass automatic regulating valve is connected with a cold water interface of a second buffer tank by a pipeline and is connected with the main pipeline by a right bypass pipeline, the second branch automatic shutoff valve is connected with one end of a connecting pipeline between the outlet of the second upper booster pump and the second bypass automatic shutoff valve, the outlet of the second heat network circulating pump is connected with the second branch automatic shutoff valve by a pipeline, one end of the second branch automatic regulating valve is connected with the outlet of the second heat network circulating pump by a pipeline, and the other end of the second branch automatic regulating valve is connected on the connecting pipeline 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 of claim 1, wherein the first bypass controller maintains a base load when not modulating frequency, thereby achieving fast response to frequency modulation.

5. The dual bypass control steam extraction hybrid heat exchange frequency modulation system of claim 1, wherein the second bypass controller maintains a base load when not modulating frequency, thereby achieving fast response to frequency modulation.

6. The dual bypass control steam extraction hybrid heat exchange frequency modulation system according to claim 1, wherein the heat exchange medium of the first bypass control 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, wherein the heat exchange medium of the second bypass control is boiler condensate or winter heating network circulating water.

8. The system of claim 2, wherein the first buffer tank is a hybrid heat exchanger, and the steam and water are directly mixed for heat exchange.

9. The system of claim 3, wherein the second buffer tank is a hybrid heat exchanger, and the steam and water are directly mixed for heat exchange.

10. The dual bypass control steam extraction type mixed heat exchange frequency modulation system according to claim 2, wherein the first buffer tank is a pressure-bearing tank or an atmospheric tank.

11. The system of claim 3, wherein the second buffer tank is a pressurized tank or an atmospheric tank.

Technical Field

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system which can be widely applied to the field of power plant flexible frequency modulation.

Background

With the adjustment of economic policies, the electricity utilization structure of China changes, the electricity utilization requirement on the user side changes all the time, and in addition, with the gradual improvement of environmental protection policies, the proportion of wind energy and solar energy renewable energy sources is greatly improved, but the renewable energy sources have instability, and a power plant is required to adjust the load size so as to ensure the balance of supply and demand of a power grid. In summary, because both the supply and demand sides of the power grid have instantaneous imbalance, the power grid and the frequency thereof are easily disturbed, and the frequency is an important technical index for the safe and stable operation of the power system.

At present, a power plant responds to the frequency modulation requirement of a power grid mainly by increasing or decreasing fuel or adjusting the steam inlet quantity of a steam turbine through a boiler, but the measures have certain limitations, such as delay of the boiler and limited regulation allowance of the steam turbine. In addition, other frequency modulation means exist at present, such as an energy storage frequency modulation mode of a storage battery and a heat storage tank and an energy conversion mode of an electrode boiler, and the modes have the problems of low frequency modulation response speed, high investment cost and high operating cost.

Disclosure of Invention

The invention aims to provide a double-bypass control steam extraction type mixed heat exchange frequency modulation system which can quickly respond to the frequency modulation requirement of a power grid on the load change of a unit, avoid frequent switching of an automatic steam inlet regulating valve during the frequency modulation of a steam turbine, ensure stable and reliable operation, ensure the safe operation of the steam turbine, obviously improve the service life and flexibility of the unit, save energy and have large frequency modulation amplitude.

In order to achieve the above purpose, the double-bypass control steam extraction type mixed heat exchange frequency modulation system comprises a high-pressure cylinder, a medium-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the medium-pressure cylinder through a pipeline, a condenser connected with the low-pressure cylinder through a pipeline, a condensate pump connected with the condenser through a pipeline, a lower-level low-pressure heater connected with the condensate pump through a pipeline, a first bypass controller connected with the lower-level low-pressure heater through a main pipeline, a higher-level low-pressure heater which is connected with the first bypass controller through the main pipeline, is directly connected with the lower-level low-pressure heater through a drain pipeline and is directly connected with the medium-pressure cylinder through a steam extraction pipeline of the medium-pressure cylinder, a second bypass controller connected with the higher-level low-pressure heater through the main pipeline, and a deaerator connected with the second bypass controller through a pipeline, the high-pressure heater is directly connected with the deaerator through a pipeline, and the inlet of the high-pressure heater is connected with the second bypass controller through a pipeline and is also connected with the high-pressure cylinder through a steam pipeline, and the outlet of the high-pressure heater is connected with the intermediate pressure cylinder through a steam pipeline.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a first bypass controller comprises a first buffer tank, a first lower part booster pump, a first lower part automatic regulating valve, a first upper part booster pump, a first bypass automatic shutoff valve and a first bypass automatic shutoff valve, wherein the bottom of the first buffer tank is provided with a steam inlet interface and a water outlet interface, and the middle part of the first buffer tank is provided with a cold water interface and a hot water interface, the first lower part booster pump is positioned at the lower part of the first buffer tank and is connected with the water outlet interface of the first buffer tank through a pipeline and is connected with a drain pipeline, the first lower part automatic regulating valve is positioned at the lower part of the first buffer tank and is connected with the steam inlet interface of the first buffer tank through a pipeline and is connected with a steam extraction pipeline of a medium pressure cylinder through a pipeline, the first bypass automatic shutoff valve is positioned at the upper part of the liquid level of the first buffer tank and is connected with the hot water interface of the first buffer tank through a pipeline and is connected with a main pipeline through a left bypass pipeline, a first main path automatic shutoff valve positioned on the main pipeline connecting the upper low pressure heater and the lower low pressure heater, a first upper part automatic regulating valve connected between the inlet and the outlet of the first main part automatic shutoff valve through a pipeline, a first bypass automatic regulating valve connected with the cold water interface of the first buffer tank through a pipeline and the main pipeline through a right bypass pipeline, a first branch automatic shutoff valve with one end connected on the connecting pipeline between the outlet of the first upper part booster pump and the first bypass automatic shutoff valve, the outlet of the first heat supply network circulating pump is connected with the first branch automatic shutoff valve through a pipeline, one end of the first branch automatic regulating valve is connected with the outlet of the first heat supply network circulating pump through a pipeline, and the other end of the first branch automatic regulating valve is connected to the connecting pipeline between the first buffer tank and the first bypass automatic regulating valve.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a second bypass controller comprises a second buffer tank, a second lower booster pump, a second lower automatic regulating valve, a second upper booster pump, a second bypass automatic shutoff valve and a second bypass automatic shutoff valve, wherein the bottom of the second buffer tank is provided with a steam inlet interface and a water outlet interface, and the middle of the second buffer tank is provided with a cold water interface and a hot water interface, the second lower booster pump is positioned at the lower part of the second buffer tank and is connected with the water outlet interface of the second buffer tank through a pipeline and is also connected with a deaerator through a pipeline, the second lower automatic regulating valve is positioned at the lower part of the second buffer tank and is connected with the steam inlet interface of the second buffer tank through a pipeline and is also connected with a high pressure cylinder and a reheater through a pipeline, the second upper booster pump is positioned at the upper part of the second buffer tank and is connected with the hot water interface of the second buffer tank through a pipeline and a left bypass pipeline, the second main automatic shutoff valve is positioned on a main pipeline connected with the deaerator by a higher-level low-pressure heater, the second upper automatic regulating valve is connected between the inlet and the outlet of the second main automatic shutoff valve by a pipeline, the second bypass automatic regulating valve is connected with a cold water interface of a second buffer tank by a pipeline and is connected with the main pipeline by a right bypass pipeline, the second branch automatic shutoff valve is connected with one end of a connecting pipeline between the outlet of the second upper booster pump and the second bypass automatic shutoff valve, the outlet of the second heat network circulating pump is connected with the second branch automatic shutoff valve by a pipeline, one end of the second branch automatic regulating valve is connected with the outlet of the second heat network circulating pump by a pipeline, and the other end of the second branch automatic regulating valve is connected on the connecting pipeline between the second buffer tank and the second bypass automatic regulating valve.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first bypass controller also maintains a basic load when the frequency is not modulated, and the fast response of the frequency modulation is realized.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the second bypass controller also maintains a basic load when the frequency is not modulated, and the fast response of the frequency modulation is realized.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a heat exchange medium of a second bypass controller is boiler condensed water or winter heat supply network circulating water.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a second buffer tank is a pressure-bearing tank or a normal pressure tank.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, which adopts two bypass controllers to work cooperatively. When it is desired to increase the grid frequency, i.e., increase the plant power generation load, it is desired to reduce the bypass controller load. The extraction of steam of the bypass controller is reduced, more steam is used for generating power by the steam turbine, the load of the unit can be quickly improved, and the requirement of increasing the frequency of the power grid can be quickly responded. The specific working process is as follows:

firstly, when the heat exchange medium is condensed water, the main circuit automatic shutoff valve, the branch automatic regulating valve and the branch automatic shutoff valve of the two bypass controllers are all in a closed state, and the bypass automatic shutoff valves of the two bypass controllers are in an open state. The opening of the lower automatic regulating valves of the two bypass controllers is reduced, so that the steam extraction of the intermediate pressure cylinder is reduced, and the frequency of the lower booster pump is also reduced to maintain the liquid level in the buffer tank because the steam extraction amount is reduced, so that the water discharge amount of the buffer tank is equivalent to the steam extraction amount. Because the extraction steam volume reduces, in order to make the temperature of the condensate water in the buffer tank keep within the design value range, need to reduce the flow that the condensate water got into the buffer tank, increase upper portion automatically regulated valve opening, reduce bypass automatically regulated valve opening. In order to maintain the water flow balance of the system, the frequency of the booster pump at the upper part of the outlet of the buffer tank needs to be reduced, so that the hot water outlet quantity of the buffer tank is equivalent to the cold water inlet quantity.

And secondly, when the heat exchange medium is heat supply network circulating water, the upper automatic regulating valves, the bypass automatic regulating valves and the bypass automatic shutoff valves of the two bypass controllers are in a closed state, and the main automatic shutoff valves and the branch automatic shutoff valves of the two bypass controllers are in an open state. The opening of the lower automatic regulating valves of the two bypass controllers is reduced, so that the steam extraction of the intermediate pressure cylinder is reduced, and the frequency of the lower booster pump is also reduced to ensure that the water discharge amount of the buffer tank is equivalent to the steam extraction amount in order to maintain the liquid level in the buffer tank because the steam extraction amount is reduced. Because the steam extraction volume reduces, in order to make the temperature of heat supply network circulating water in the buffer tank keep in the design value scope, need to reduce the flow that the heat supply network circulating water got into the buffer tank, reduce branch road automatically regulated valve opening. In order to maintain the flow balance of the circulating water of the heat supply network, the frequency of a booster pump at the upper part of the outlet of the buffer tank also needs to be reduced, so that the hot water outlet quantity of the buffer tank is equivalent to the cold water inlet quantity.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, which adopts two bypass controllers to work cooperatively. When it is desired to reduce the grid frequency, i.e., reduce the power plant generating load, it is desired to increase the bypass controller load. The bypass controller extracts more steam, the steam used for the steam turbine to generate electricity is reduced, the load of the unit is rapidly reduced, and the requirement of rapidly responding to the reduction of the grid frequency is met. The specific working process is as follows:

firstly, when the heat exchange medium is condensed water, the main circuit automatic shutoff valve, the branch automatic regulating valve and the branch automatic shutoff valve of the two bypass controllers are in a closed state, and the bypass automatic shutoff valves of the two bypass controllers are in an open state. The valve opening of the lower automatic regulating valves of the two bypass controllers is increased, the steam extraction of the intermediate pressure cylinder is increased, and the frequency of the lower booster pump is also increased to maintain the liquid level in the buffer tank so that the water discharge amount of the buffer tank is equivalent to the steam extraction amount. Because of the increase of the steam extraction amount, in order to keep the temperature of the condensed water in the buffer tank at a designed value, the flow of the condensed water entering the buffer tank needs to be increased, the opening degree of the upper automatic regulating valve needs to be reduced, and the opening degree of the bypass automatic regulating valve needs to be increased. In order to maintain the water flow balance of the main system, the frequency of the booster pump at the upper part of the outlet of the buffer tank needs to be increased, so that the hot water outlet quantity of the buffer tank is equivalent to the cold water inlet quantity.

And secondly, when the heat exchange medium is heat supply network circulating water, the upper automatic regulating valves, the bypass automatic regulating valves and the bypass automatic shutoff valves of the two bypass controllers are in a closed state, and the main automatic shutoff valves and the branch automatic shutoff valves of the two bypass controllers are in an open state. The valve opening of the lower automatic regulating valves of the two bypass controllers is increased, the steam extraction of the intermediate pressure cylinder is increased, and the frequency of the lower booster pump is also increased to keep the liquid level in the buffer tank so that the water discharge amount of the buffer tank is equivalent to the steam extraction amount. Because of the increase of the steam extraction amount, in order to keep the temperature of the circulating water of the heat supply network in the buffer tank at a designed value, the flow of the circulating water of the heat supply network entering the buffer tank needs to be increased, and the opening degree of the automatic branch adjusting valve needs to be increased. In order to maintain the flow balance of the circulating water of the main system heat supply network, the frequency of a booster pump at the upper part of the outlet of the buffer tank needs to be increased, so that the hot water outlet quantity of the buffer tank is equivalent to the cold water inlet quantity.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first buffer tank or the second buffer tank is designed for capacity according to the requirement of the frequency modulation amplitude of a power grid so as to meet the requirement of heat storage. And is designed into a pressure-bearing tank or a normal pressure tank according to the steam temperature, pressure and water temperature requirements of an inlet and an outlet. The drain pipeline connected with the buffer tank water discharge interface is a drain pipeline with the same steam extraction quality as the buffer tank or a drain pipeline with the temperature and the pressure corresponding to the water discharge port.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first or second main path automatic shutoff valve, the bypass automatic shutoff valve and the branch automatic shutoff valve are electrically, pneumatically or hydraulically driven valves, and a medium can be automatically, rapidly and reliably stopped.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first or second lower automatic regulating valve, the bypass automatic regulating valve, the upper automatic regulating valve and the branch automatic regulating valve are electrically, pneumatically or hydraulically driven valves, and the medium flow can be automatically, rapidly and reliably regulated.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first or second lower booster pump and the upper booster pump can automatically control and adjust the medium flow.

The double-bypass control steam extraction type mixed heat exchange frequency modulation system adopts two bypass controllers, and under the condition of not changing the structure of a steam turbine and the opening of an automatic steam inlet adjusting valve, the frequency modulation requirement of a response power grid on the load change of a unit is quickly met by directly increasing and reducing the steam flow of a high and medium pressure cylinder of the steam turbine, the frequent switching of the automatic steam inlet adjusting valve during the frequency modulation of the steam turbine is avoided, the operation is stable and reliable, the safe operation of the steam turbine is ensured, and the service life and the flexibility of the unit are obviously improved.

The double-bypass control steam extraction type mixed heat exchange frequency modulation system can directly heat boiler condensed water or heat supply network water by extracted steam, has very small energy loss in the frequency modulation process, almost has no energy loss, and has remarkable energy saving effect.

The double-bypass control steam extraction type mixed heat exchange frequency modulation system adopts the double-bypass controller and has the advantage of large frequency modulation amplitude.

In conclusion, the double-bypass control steam extraction type mixed heat exchange frequency modulation system disclosed by the invention can quickly meet the frequency modulation requirement of a response power grid on the load change of a unit, avoid frequent switching of an automatic steam inlet regulating valve during the frequency modulation of a steam turbine, ensure stable and reliable operation, ensure the safe operation of the steam turbine, obviously improve the service life and flexibility of the unit, save energy obviously and have large frequency modulation amplitude.

Drawings

The invention will be further described with reference to the accompanying drawings and examples thereof.

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

In fig. 1, the double bypass control steam extraction type mixed heat exchange frequency modulation system of the invention comprises a high pressure cylinder 1, an intermediate pressure cylinder 2 connected with the high pressure cylinder through a pipeline, a low pressure cylinder 3 connected with the intermediate pressure cylinder through a pipeline, a condenser 4 connected with the low pressure cylinder through a pipeline, a condensate pump 5 connected with the condenser through a pipeline, a lower low pressure heater 6 connected with the condensate pump through a pipeline, a first bypass controller 7 connected with the lower low pressure heater through a main pipeline 13, a higher low pressure heater 8 connected with the first bypass controller through a main pipeline, directly connected with the lower low pressure heater through a drain pipeline 14, directly connected with the intermediate pressure cylinder through an intermediate pressure cylinder steam extraction pipeline 15, a second bypass controller 9 connected with the higher low pressure heater through a main pipeline, and a deaerator 10 connected with the second bypass controller through a pipeline, a high pressure heater 11 directly connected with the deaerator through a pipeline, a reheater 12 with an inlet connected with a second bypass controller through a pipeline, a high pressure cylinder through a steam pipeline, and an outlet connected with a middle pressure cylinder through a steam pipeline.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a first bypass controller 7 comprises a first buffer tank 7-1, a first lower booster pump 7-2, a first lower automatic regulating valve 7-3, a first upper booster pump 7-4, a first bypass automatic shutoff valve 7 and a second bypass automatic shutoff valve 7, wherein the bottom of the first buffer tank is provided with a steam inlet interface and a water outlet interface, and the middle of the first buffer tank is provided with a cold water interface and a hot water interface, the first lower automatic regulating valve 7-2 is positioned at the lower part of the first buffer tank and is connected with the water outlet interface of the first buffer tank through a pipeline and is connected with a steam extraction pipeline of a medium pressure cylinder through a pipeline, the first lower automatic regulating valve 7-3 is positioned at the lower part of the first buffer tank and is connected with the hot water interface of the first buffer tank through a pipeline, and the first bypass automatic shutoff valve 7 is connected with the main pipeline through a pipeline and the first upper booster pump through a left bypass pipeline 5, a first main-path automatic shutoff valve 7-6 positioned on a main pipeline connected with a higher-level low-pressure heater and a lower-level low-pressure heater, a first upper-portion automatic regulating valve 7-7 connected between an inlet and an outlet of the first main-path automatic shutoff valve through a pipeline, a first bypass automatic regulating valve 7-8 connected with a cold water interface of a first buffer tank through a pipeline and connected with the main pipeline through a right bypass pipeline, a first branch-path automatic shutoff valve 7-9 connected with a connecting pipeline between an outlet of the first upper-portion booster pump and the first bypass automatic shutoff valve at one end, a first heat-network circulating pump outlet 7-10 connected with the first branch-path automatic shutoff valve through a pipeline, and a first branch-path automatic regulating valve 7-11 connected with the first heat-network circulating pump outlet at one end through a pipeline and connected with a connecting pipeline between the first buffer tank and the first bypass automatic shutoff valve at the other end.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a second bypass controller 9 comprises a second buffer tank 9-1, a second lower part booster pump 9-2, a second lower part automatic regulating valve 9-3, a second upper part booster pump 9-4, a second bypass automatic shutoff valve 9-5 and a second bypass automatic shutoff valve 9-5, wherein the bottom of the second buffer tank is provided with a steam inlet and a water outlet, and the middle of the second buffer tank is provided with a cold water port and a hot water port, the second lower part automatic regulating valve 9-2 is positioned at the lower part of the second buffer tank and is connected with the water outlet of the second buffer tank through a pipeline and is also connected with a deaerator through a pipeline, the second lower part automatic regulating valve 9-3 is positioned at the lower part of the second buffer tank and is connected with the steam inlet of the second buffer tank through a pipeline and is also connected with a high pressure cylinder and a reheater through a pipeline, the second upper part booster pump 9-4 is positioned at the upper part of the second buffer tank and is connected with the main pipeline through a left bypass pipeline A second main-path automatic shutoff valve 9-6 positioned on the main pipeline connecting the upper-level low-pressure heater and the deaerator, a second upper automatic regulating valve 9-7 connected between the inlet and the outlet of the second main automatic shutoff valve through a pipeline, a second bypass automatic regulating valve 9-8 connected with the cold water interface of the second buffer tank through a pipeline and the main pipeline through a right bypass pipeline, a second branch automatic shutoff valve 9-9 connected with the connecting pipeline between the outlet of the second upper booster pump and the second bypass automatic shutoff valve at one end, a second heat supply network circulating pump outlet 9-10 connected with a second branch automatic shutoff valve through a pipeline, and a second branch automatic regulating valve 9-11 with one end connected with the second heat supply network circulating pump outlet through a pipeline and the other end connected with a connecting pipeline between the second buffer tank and the second bypass automatic regulating valve.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the first bypass controller also maintains a basic load when the frequency is not modulated, and the fast response of the frequency modulation is realized.

According to the double-bypass control steam extraction type mixed heat exchange frequency modulation system, the second bypass controller also maintains a basic load when the frequency is not modulated, and the fast response of the frequency modulation is realized.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a heat exchange medium of a second bypass controller is boiler condensed water or winter heat supply network circulating water.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system.

The invention relates to a double-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a second buffer tank is a pressure-bearing tank or a normal pressure tank.

In view of the foregoing, it is intended that the present invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.