阅读说明：本技术 蓄热器水路调控快速调频系统 (Quick frequency modulation system of heat accumulator water route regulation and control ) 是由 王杏 王勇 赵明星 傅吉收 侯兆亭 谢玲 于 2021-09-30 设计创作，主要内容包括：一种蓄热器水路调控快速调频系统,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,上级低压加热器,通过管道与上级低压加热器相连接的除氧器,既通过管道与除氧器相连接又通过第三疏水管道与除氧器相连接的高压加热器,通过管道与高压缸管道相连的低温再热器,通过管道与低温再热器、高压缸相连接的再热蒸汽冷段调节阀,蓄热器,蓄热器水路调控器,供蒸汽侧调节阀,通过管道与供蒸汽侧调节阀相连接的电再热器,通过管道与电再热器相连接、控制蒸汽用户供给的蒸汽热用户侧手动关断阀。本发明能满足电网快速调频需求,提高机组运行经济性,利用蓄热器将蒸汽存储起来,提高蒸汽利用率,节能。可广泛应用于电厂调频领域中。(The utility model provides a quick frequency modulation system of heat accumulator water route regulation and control, including the high pressure jar, the intermediate pressure jar, the low pressure jar, the condenser, condensate pump, subordinate low pressure heater, higher level low pressure heater, the oxygen-eliminating device that is connected with higher level low pressure heater through the pipeline, both be connected with the oxygen-eliminating device through the pipeline and the high pressure heater that is connected with the oxygen-eliminating device through the third drain line, the low temperature re-heater that links to each other with high pressure cylinder pipeline through the pipeline, through pipeline and low temperature re-heater, the reheat steam cold section governing valve that the high pressure jar is connected, the heat accumulator, heat accumulator water route modulator, supply steam side governing valve, the electricity re-heater that is connected with the confession steam side governing valve through the pipeline, be connected with the electricity re-heater through the pipeline, the manual shutoff valve of steam hot user side of control steam user supply. The invention can meet the requirement of rapid frequency modulation of a power grid, improve the running economy of the unit, store steam by using the heat accumulator, improve the utilization rate of the steam and save energy. Can be widely applied to the field of frequency modulation of power plants.)

1. A rapid frequency modulation system for regulating and controlling a water path of a heat accumulator 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 and the condenser through a first drain pipeline, a superior low-pressure heater connected with the subordinate low-pressure heater through a pipeline and a second drain pipeline and connected with the intermediate-pressure cylinder through an intermediate-pressure steam extraction pipeline, a deaerator connected with the superior low-pressure heater through a pipeline, a high-pressure heater connected with the deaerator through a pipeline and a third drain pipeline, and a low-temperature reheater connected with a pipeline of the high-pressure cylinder through a pipeline, the steam-reheating cold section regulating valve is connected with the high-pressure cylinder through a pipeline, the bottom of the steam-reheating cold section regulating valve is provided with a cold water port, the upper part of the steam-reheating cold section regulating valve is provided with a hot water port, the top of the steam-reheating cold section regulating valve is provided with a steam port, and the heat accumulator is connected with the reheating steam cold section regulating valve through a pipeline, the upper part of the heat accumulator is provided with a hot water port, the top of the heat accumulator is provided with a pipeline, the upper part of the heat accumulator is provided with a pipeline between the deaerator and a higher-level low-pressure heater, the lower part of the heat accumulator is provided with a heat accumulator water path regulator connected with the cold water port and the hot water port of the heat accumulator through pipelines, the steam-supplying side regulating valve is connected with the steam-supplying side regulating valve through a pipeline, the steam-heating user side manual shutoff valve is connected with the electric reheater through a pipeline, and controls the supply of a steam user.

2. The heat accumulator waterway regulation and control rapid frequency modulation system as claimed in claim 1, wherein the heat accumulator waterway regulator comprises a heat accumulator cold water side regulating valve connected with the heat accumulator bottom cold water port through a pipeline, a cold water side electric shutoff valve connected with the heat accumulator cold water side regulating valve through a pipeline and connected with a pipeline between the next-stage low-pressure heater and the previous-stage low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve connected with the heat accumulator upper hot water port through a pipeline, a hot water side electric shutoff valve connected with the heat accumulator hot water side regulating valve through a pipeline and connected with a pipeline between the deaerator and the previous-stage low-pressure heater through a pipeline, a first electric valve with one end connected with the heat accumulator bottom cold water port, a second electric valve connected with the first electric valve through a pipeline and connected with the upper hot water port through a pipeline, the heat accumulator comprises a heat accumulator, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a circulating water pump and a heat accumulator, wherein one end of the third electric valve is connected to a pipeline between a heat accumulator cold water side regulating valve and a cold water side electric shutoff valve, one end of the fourth electric valve is connected to the third electric valve through a pipeline, the other end of the fourth electric valve is connected to a pipeline between a heat accumulator hot water side regulating valve and a hot water side electric shutoff valve, one end of the circulating water pump is connected to a pipeline between the first electric valve and the second electric valve, and the other end of the circulating water pump is connected to a pipeline between the third electric valve and the fourth electric valve.

Technical Field

The invention relates to a rapid frequency modulation system for regulating and controlling a water path of a heat accumulator, which can be widely applied to the field of frequency modulation of power plants.

Background

The stability and accuracy of the power supply frequency of the power grid are important indexes of power supply quality. When the sum of active power produced by the generator sets in the power grid is larger than the sum of related power consumed by the power grid, the power supply frequency is increased, and otherwise, the power supply frequency is reduced. The change and deviation of the power grid frequency have great influence and harm on users and prime movers, the frequency modulation process is a process for adjusting energy balance in the power production process, and the energy supply of various energy storage and thermodynamic systems is adjusted through frequency modulation, so that the energy balance of power generation and power utilization is realized, and the reasonable distribution of electric loads is realized.

Disclosure of Invention

The invention aims to provide a heat accumulator waterway regulation and control rapid frequency modulation system which can meet the requirement of rapid frequency modulation of a power grid, improve the running economy of a unit, store steam by using a heat accumulator, improve the utilization rate of the steam and save energy.

In order to achieve the purpose, the rapid frequency modulation system for regulating and controlling the water path of the heat accumulator 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 and the condenser through a first drain pipeline, a higher-level low-pressure heater connected with the lower-level low-pressure heater through a pipeline and a second drain pipeline and connected with the intermediate-pressure cylinder through an intermediate-pressure steam extraction pipeline, a deaerator connected with the higher-level low-pressure heater through a pipeline, a high-pressure heater connected with the deaerator through a pipeline and a third drain pipeline, and a low-temperature heater connected with a high-pressure cylinder pipeline through a pipeline, the steam-reheating cold section regulating valve is connected with the high-pressure cylinder through a pipeline, the bottom of the steam-reheating cold section regulating valve is provided with a cold water port, the upper part of the steam-reheating cold section regulating valve is provided with a hot water port, the top of the steam-reheating cold section regulating valve is provided with a steam port, and the heat accumulator is connected with the reheating steam cold section regulating valve through a pipeline, the upper part of the heat accumulator is provided with a hot water port, the top of the heat accumulator is provided with a pipeline, the upper part of the heat accumulator is provided with a pipeline between the deaerator and a higher-level low-pressure heater, the lower part of the heat accumulator is provided with a heat accumulator water path regulator connected with the cold water port and the hot water port of the heat accumulator through pipelines, the steam-supplying side regulating valve is connected with the steam-supplying side regulating valve through a pipeline, the steam-heating user side manual shutoff valve is connected with the electric reheater through a pipeline, and controls the supply of a steam user.

The invention relates to a rapid frequency modulation system for regulating and controlling a heat accumulator waterway, which comprises a heat accumulator cold water side regulating valve connected with a heat accumulator bottom cold water port through a pipeline, a cold water side electric shutoff valve which is connected with the heat accumulator cold water side regulating valve through a pipeline and is connected with a pipeline between a lower-level low-pressure heater and an upper-level low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve which is connected with a heat accumulator upper hot water port through a pipeline, a hot water side electric shutoff valve which is connected with the heat accumulator hot water side regulating valve through a pipeline and is connected with a pipeline between a deaerator and an upper-level low-pressure heater through a pipeline, a first electric valve of which one end is connected with the heat accumulator bottom cold water port, and a second electric valve which is connected with a first electric valve through a pipeline and is connected with a heat accumulator upper hot water port through a pipeline, the heat accumulator comprises a heat accumulator, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a circulating water pump and a heat accumulator, wherein one end of the third electric valve is connected to a pipeline between a heat accumulator cold water side regulating valve and a cold water side electric shutoff valve, one end of the fourth electric valve is connected to the third electric valve through a pipeline, the other end of the fourth electric valve is connected to a pipeline between a heat accumulator hot water side regulating valve and a hot water side electric shutoff valve, one end of the circulating water pump is connected to a pipeline between the first electric valve and the second electric valve, and the other end of the circulating water pump is connected to a pipeline between the third electric valve and the fourth electric valve.

The invention relates to a rapid frequency modulation system for regulating and controlling a water path of a heat accumulator, which has the working principle that: when the system operates at the base load, the reheat steam cold section regulating valve or the intermediate pressure cylinder steam extraction regulating valve is opened, steam is extracted from the reheat steam cold section or the intermediate pressure cylinder, and the steam provides steam for a user through the steam supply side regulating valve. And if the user needs the superheated steam, the electric reheater is opened, and the saturated steam is heated into the superheated steam for the user to use. If the user requires saturated steam, the electric reheater is shut down. When the frequency of the power grid needs to be improved, the steam extraction flow is reduced, so that the output electric power of the steam turbine is increased; when the grid frequency needs to be reduced, the extraction flow is increased, so that the output electric power of the steam turbine is reduced. Therefore, the requirement of rapid frequency modulation of the power grid can be met, and the running economy of the unit is improved.

The invention relates to a rapid frequency modulation system for regulating and controlling a water path of a heat accumulator, which comprises the following working processes:

(1) when the capacity of the heat accumulator is insufficient due to overlarge steam extraction amount, the heat in the heat accumulator needs to be released, the cold water side electric shutoff valve and the heat accumulator cold water side regulating valve are opened, and the cold water at the outlet of the lower-stage low-pressure heater flows into the heat accumulator. When the first electric valve, the third electric valve and the heat accumulator hot water side regulating valve are closed, the hot water in the heat accumulator flows into the outlet of the upper-level low-pressure heater after passing through the second electric valve, the circulating water pump, the fourth electric valve and the hot water side electric shutoff valve.

(2) When the extraction steam quantity is insufficient, heat is needed to be supplemented to the heat accumulator. Namely, the hot water side electric shutoff valve and the heat accumulator hot water side regulating valve are opened, and the hot water at the outlet of the upper-level low-pressure heater flows into the heat accumulator. When the fourth electric valve, the second electric valve and the cold water side regulating valve of the heat accumulator are closed, the cold water in the heat accumulator flows into the outlet of the lower-stage low-pressure heater after passing through the first electric valve, the circulating water pump, the third electric valve and the cold water side electric shutoff valve.

According to the rapid frequency modulation system for regulating and controlling the water path of the heat accumulator, the heat accumulator water path regulator and the heat accumulation process share the circulating water pump, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.

The heat accumulator can store extracted steam and continuously supply the extracted steam to steam users for use, so that the heat accumulator plays roles in storage and buffering. Therefore, the steam is stored by the heat accumulator, and the steam utilization rate is improved.

The invention relates to a rapid frequency modulation system for regulating and controlling a water channel of a heat accumulator, which operates with a constant value basic load, namely, a frequency modulation steam extraction system extracts steam with a constant value flow. The basic load is determined by comprehensively considering the flow of the reheat steam cold section, the steam extraction flow of the intermediate pressure cylinder and the frequency modulation range under the condition of low load.

According to the rapid frequency modulation system for regulating and controlling the water path of the heat accumulator, if a user needs saturated steam, the steam stored in the heat accumulator can be directly used; if the user needs the superheated steam, the steam in the heat accumulator needs to be heated by the electric heater and then used by the user.

The heat accumulator waterway regulation and control rapid frequency modulation system disclosed by the invention realizes a steam extraction path for rapid frequency modulation, and can be used for extracting steam at a reheating steam cold section or an intermediate pressure cylinder, and can also be used for combining two paths. The two-way steam extraction can meet the flow requirement and achieve the aim of energy conservation.

In conclusion, the rapid frequency modulation system for regulating and controlling the water channel of the heat accumulator can meet the requirement of rapid frequency modulation of a power grid, improve the running economy of a unit, store steam by using the heat accumulator, improve the utilization rate of the steam and 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 rapid frequency modulation system for regulating and controlling the water path of the heat accumulator 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-level low pressure heater 6 connected with the condensate pump through a pipeline and the condenser through a first drain pipeline, a higher-level low pressure heater 7 connected with the lower-level low pressure heater through a pipeline and a second drain pipeline and connected with the intermediate pressure cylinder through a steam extraction pipeline of the intermediate pressure cylinder, a deaerator 8 connected with the higher-level low pressure heater through a pipeline, and a high pressure heater 9 connected with the deaerator through a pipeline and a deaerator through a third drain pipeline, a low-temperature reheater 10 connected with a high-pressure cylinder pipeline through a pipeline, a reheat steam cold section regulating valve 11 connected with the low-temperature reheater and the high-pressure cylinder through pipelines, a heat accumulator 12 provided with a cold water port at the bottom, a hot water port at the upper part and a steam port at the top and connected with the reheat steam cold section regulating valve through a pipeline, a heat accumulator waterway regulator 13 connected with a pipeline between the deaerator and a higher low-pressure heater, a pipeline between the higher low-pressure heater and a lower low-pressure heater through a pipeline and connected with the cold water port and the hot water port of the heat accumulator through pipelines, a steam supply side regulating valve 14 connected with the top of the heat accumulator through a pipeline, an electric reheater 15 connected with the steam supply side regulating valve through a pipeline, and a steam heat user side manual shutoff valve 16 connected with the electric reheater through a pipeline and controlling the supply of the steam user.

The invention relates to a rapid frequency modulation system for regulating and controlling a water path of a heat accumulator, wherein a heat accumulator water path regulator 13 comprises a heat accumulator cold water side regulating valve 13-1 connected with a heat accumulator bottom cold water port through a pipeline, a cold water side electric shutoff valve 13-2 connected with the heat accumulator cold water side regulating valve through a pipeline and connected with a pipeline between a lower-level low-pressure heater and an upper-level low-pressure heater through a pipeline, a heat accumulator hot water side regulating valve 13-3 connected with a heat accumulator upper hot water port through a pipeline, a hot water side electric shutoff valve 13-4 connected with the heat accumulator hot water side regulating valve through a pipeline and connected with a pipeline between a deaerator and an upper-level low-pressure heater through a pipeline, a first electric valve 13-5 with one end connected with the bottom cold water port through a pipeline, a first electric valve 13-5 connected with the bottom cold water port through a pipeline, A second electric valve 13-6 connected with the upper hot water port of the heat accumulator through a pipeline, a third electric valve 13-7 with one end connected with the pipeline between the cold water side regulating valve and the cold water side electric shutoff valve of the heat accumulator, a fourth electric valve 13-8 with one end connected with the third electric valve through a pipeline and the other end connected with the pipeline between the hot water side regulating valve and the hot water side electric shutoff valve of the heat accumulator, and a circulating water pump 13-9 with one end connected with the pipeline between the first electric valve and the second electric valve and the other end connected with the pipeline between the third electric valve and the fourth electric valve.

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.