阅读说明：本技术 单旁路控制抽汽式混合换热调频系统 (Single-bypass control steam extraction type mixed heat exchange frequency modulation system ) 是由 王勇 傅吉收 赵明星 张洪涛 娄扬 于 2021-09-30 设计创作，主要内容包括：一种单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,通过管道与低压缸相连接的凝汽器,凝结水泵,通过管道与凝结水泵相连接的下级低压加热器,通过主管道与下级低压加热器相连接的旁路控制器,通过主管道与旁路控制器相连接的上级低压加热器,通过管道与上级低压加热器直接相连接的除氧器,通过管道与除氧器直接相连接的高压加热器,入口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。可广泛应用于电厂灵活性调频领域中。(The utility model provides a mixed heat transfer frequency modulation system of single bypass control steam extraction formula, including the high pressure jar, the intermediate pressure jar, the low pressure jar, the condenser that is connected with the low pressure jar through the pipeline, condensate pump, the subordinate low pressure heater who is connected with condensate pump through the pipeline, the bypass controller who is connected with subordinate low pressure heater through the trunk line, the higher level low pressure heater who is connected with the bypass controller through the trunk line, the oxygen-eliminating device who directly is connected with higher level low pressure heater through the pipeline, the high pressure heater who directly is connected with the oxygen-eliminating device through the pipeline, the entry 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 to 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 and obviously save energy. The method can be widely applied to the field of flexible frequency modulation of power plants.)

1. The single-bypass control steam extraction type mixed heat exchange frequency modulation system is characterized by comprising a high-pressure cylinder, an intermediate-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the intermediate-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 bypass controller connected with the subordinate low-pressure heater through a main pipeline, a superior low-pressure heater directly connected with the subordinate low-pressure heater through a main pipeline, a high-pressure heater directly connected with the deaerator through a pipeline, an inlet connected with the high-pressure cylinder through a steam pipeline, a condenser connected with the low-pressure cylinder through a pipeline, a superior low-pressure heater directly connected with the intermediate-pressure cylinder through a steam pipeline, a deaerator directly connected with the superior low-pressure heater through a pipeline, and a steam generator connected with the high-pressure cylinder through a steam pipeline, And the outlet of the reheater is connected with the intermediate pressure cylinder through a steam pipeline.

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

3. The single-bypass control steam extraction type mixed heat exchange frequency modulation system as claimed in claim 1, wherein the bypass controller also maintains a base load when not modulating the frequency, thereby realizing fast response of frequency modulation.

4. The single-bypass control steam extraction type mixed heat exchange frequency modulation system according to claim 1, wherein the bypass controller is used for controlling the heat exchange medium to be boiler condensed water or winter heat supply network circulating water.

5. The single-bypass control steam extraction type mixed heat exchange frequency modulation system according to claim 2, wherein the buffer tank is a mixed heat exchange type, and steam and water are directly mixed for heat exchange.

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

Technical Field

The invention relates to a single-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 single-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 the safe operation of the steam turbine, obviously prolong the service life and improve the flexibility of the unit and save energy obviously.

In order to achieve the purpose, the single-bypass control steam extraction type mixed heat exchange frequency modulation system comprises a high-pressure cylinder, an intermediate-pressure cylinder connected with the high-pressure cylinder through a pipeline, a low-pressure cylinder connected with the intermediate-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 bypass controller connected with the lower-level low-pressure heater through a main pipeline, a higher-level low-pressure heater directly connected with the lower-level low-pressure heater through a main pipeline, a high-pressure heater directly connected with the deaerator through a pipeline, and a steam inlet connected with the high-pressure cylinder through a steam pipeline, And the outlet of the reheater is connected with the intermediate pressure cylinder through a steam pipeline.

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

According to the single-bypass control steam extraction type mixed heat exchange frequency modulation system, the 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 single-bypass control steam extraction type mixed heat exchange frequency modulation system.

The single-bypass control steam extraction type mixed heat exchange frequency modulation system is characterized in that the buffer tank is used for mixed heat exchange, and steam and water are directly mixed for heat exchange.

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

According to the single-bypass control steam extraction type mixed heat exchange frequency modulation system, when the frequency of a power grid needs to be improved, namely the power generation load of a power plant is increased, the load of a bypass controller needs to be reduced. 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:

first, when the heat transfer medium is condensed water, the main path automatic shutoff valve, the branch path automatic regulating valve and the branch path automatic shutoff valve are in a closed state, and the bypass automatic shutoff valve is in an open state. The opening of the lower automatic regulating valve 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 due to the reduction of the steam extraction amount, 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 the circulating water of the heat supply network, the upper automatic regulating valve, the bypass automatic regulating valve and the bypass automatic shutoff valve are in a closed state, and the main path automatic shutoff valve and the branch path automatic shutoff valve are in an open state. The opening of the lower automatic regulating valve 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 enable the water discharge amount of the buffer tank to be 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.

According to the single-bypass control steam extraction type mixed heat exchange frequency modulation system, when the frequency of a power grid needs to be reduced, namely the power generation load of a power plant is reduced, the load of a bypass controller needs to be increased. 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:

first, when the heat transfer medium is condensed water, the main path automatic shutoff valve, the branch path automatic regulating valve and the branch path automatic shutoff valve are in a closed state, and the bypass automatic shutoff valve is in an open state. The opening of the lower automatic regulating valve is increased to increase the steam extraction of the intermediate pressure cylinder, and the frequency of the lower booster pump is also increased to make the water discharge amount of the buffer tank equal to the steam extraction amount in order to maintain the liquid level in the buffer tank because the steam extraction amount is increased. 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 the circulating water of the heat supply network, the upper automatic regulating valve, the bypass automatic regulating valve and the bypass automatic shutoff valve are in a closed state, and the main path automatic shutoff valve and the branch path automatic shutoff valve are in an open state. The opening of the lower automatic regulating valve is increased to increase the steam extraction of the intermediate pressure cylinder, and the frequency of the lower booster pump is also increased to make the water discharge amount of the buffer tank equal to the steam extraction amount in order to maintain the liquid level in the buffer tank because the steam extraction amount is increased. 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 single-bypass control steam extraction type mixed heat exchange frequency modulation system, the 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 single-bypass control steam extraction type mixed heat exchange frequency modulation system, the main path automatic shutoff valve, the bypass automatic shutoff valve and the branch path automatic shutoff valve are electrically, pneumatically or hydraulically driven valves, and a medium can be automatically, rapidly and reliably stopped.

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

The single-bypass control steam extraction type mixed heat exchange frequency modulation system adopts the bypass controller, and under the condition of not changing the structure of the steam turbine and the opening of the steam inlet automatic regulating valve, the frequency modulation requirement of a response power grid on the load change of the unit is quickly met by directly increasing and reducing the steam flow of the high and medium pressure cylinders of the steam turbine, the frequent switching of the steam inlet automatic regulating 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 single-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.

In conclusion, the single-bypass control steam extraction type mixed heat exchange frequency modulation system 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 adjusting valve during frequency modulation of a steam turbine, operate stably and reliably, ensure safe operation of the steam turbine, remarkably prolong the service life and flexibility of the unit, and remarkably save energy.

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 single 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 bypass controller 7 connected with the lower low pressure heater through a main pipeline 12, a higher low pressure heater 8 connected with the bypass controller through a main pipeline, directly connected with the lower low pressure heater through a drain pipeline 13, and directly connected with the intermediate pressure cylinder through a steam extraction pipeline 14, a deaerator 9 directly connected with the higher low pressure heater through a pipeline, and a high pressure heater 10 directly connected with the deaerator through a pipeline, and a reheater 11 with an inlet connected to the high pressure cylinder through a steam pipe and an outlet connected to the intermediate pressure cylinder through a steam pipe.

The invention relates to a single-bypass control steam extraction type mixed heat exchange frequency modulation system, wherein a bypass controller 7 comprises a buffer tank 7-1, a lower booster pump 7-2, a lower automatic regulating valve 7-3, an upper booster pump 7-4, a bypass automatic shutoff valve 7-5, a main pipeline automatic shutoff valve 7-4, a main pipeline automatic shutoff valve 7-5, a main pipeline automatic shutoff valve 7 and a main pipeline automatic shutoff valve 7, wherein the bottom of the buffer tank automatic booster pump 7-1 is provided with a steam inlet interface and a water outlet interface, and the middle of the buffer tank is provided with a cold water interface and a hot water interface, the lower part of the buffer tank is provided with a pipeline, the lower part of the buffer tank automatic regulating valve 7-2 is arranged at the lower part of the buffer tank liquid level, the buffer tank automatic regulating valve 7-3 is connected with a pipeline automatic regulating valve connected with a steam inlet interface, the steam inlet interface and a steam inlet interface, the lower part of the buffer tank automatic regulating valve connected with the buffer tank automatic regulating valve 7-3 is arranged at the lower part of the buffer tank, the lower part of the buffer tank, the buffer tank automatic shutoff valve is arranged at the lower part of the buffer tank automatic shutoff valve connected with the lower part of the buffer tank, the lower part of the buffer tank automatic shutoff valve connected with the lower part of the buffer tank connected with the main pipeline connected with the steam extraction type automatic shutoff valve connected with the main pipeline connected with the lower part of the upper -6, a bypass automatic regulating valve 7-7 connected with the cold water interface of the buffer tank through a pipeline and connected with the main pipeline through a right bypass pipeline, an upper automatic regulating valve 7-8 connected between the inlet and the outlet of the main automatic shutoff valve through a pipeline, a branch automatic shutoff valve 7-9 connected with the connecting pipeline between the outlet of the upper supercharging pump and the bypass automatic shutoff valve at one end, a heat supply network circulating pump outlet 7-10 connected with the branch automatic shutoff valve through a pipeline, and a branch automatic regulating valve 7-11 connected with the outlet of the heat supply network circulating pump at one end and the connecting pipeline between the buffer tank and the bypass automatic regulating valve at the other end.

According to the single-bypass control steam extraction type mixed heat exchange frequency modulation system, the 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 single-bypass control steam extraction type mixed heat exchange frequency modulation system.

The single-bypass control steam extraction type mixed heat exchange frequency modulation system is characterized in that the buffer tank is used for mixed heat exchange, and steam and water are directly mixed for heat exchange.

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

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.