A deep peak regulation system, method and device for thermal power units

Abstract

The present application provides a deep peak-shaving system, method, and device for a thermal power unit, comprising: a high-pressure steam desuperheating and decompression device, a medium-pressure steam desuperheating and decompression device, a low-pressure steam desuperheating and decompression device, a high-pressure regulating valve group, a medium-pressure regulating valve group, and a low-pressure regulating valve group. The high-pressure steam desuperheating and decompression device is connected to a high-pressure cylinder, a boiler, and a high-pressure heater via a high-pressure steam pipeline, respectively, for adjusting the pressure and temperature of steam in the high-pressure steam pipeline; the medium-pressure steam desuperheating and decompression device is connected to an intermediate-pressure cylinder, a boiler, an intermediate-pressure heater, and a deaerator via an intermediate-pressure steam pipeline, respectively, for adjusting the pressure and temperature of steam in the intermediate-pressure steam pipeline; and the low-pressure steam desuperheating and decompression device is connected to a low-pressure cylinder, a boiler, and a low-pressure heater via a low-pressure steam pipeline, respectively, for adjusting the pressure and temperature of steam in the low-pressure steam pipeline. This application can reduce the load of a thermal power unit and improve its deep peak-shaving capability.

Description

Technical Field

[0001] The present application relates to the field of thermal power generation, and specifically to a deep peak regulation system, method and device for a thermal power unit. Background Art

[0002] The continuous increase in installed capacity of wind and solar power generation, improving the deep peak-shaving capability of thermal power units, and promoting the large-scale consumption of new energy electricity have become the key to energy transformation.

[0003] Currently, non-heat storage-based deep peak-shaving technologies for thermal power units are primarily developed for heating units, such as high and low bypass heating, low-pressure cylinder zero-output modification, heat pump heating, and electric boiler technology. However, these technologies all have significant limitations: they can only achieve deep peak-shaving during heating periods, but not during non-heating periods. Summary of the Invention

[0004] In response to the problems in the prior art, the present application provides a deep peak-shaving system, method and device for thermal power units, which can reduce the load of thermal power units and improve the deep peak-shaving capability of thermal power units.

[0005] To solve the above technical problems, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a deep peak regulation system for a thermal power unit, comprising a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a boiler, a deaerator, a high-pressure heater, an intermediate-pressure heater, and a low-pressure heater, and further comprising: a high-pressure steam temperature and pressure reduction device, an intermediate-pressure steam temperature and pressure reduction device, a low-pressure steam temperature and pressure reduction device, a high-pressure regulating valve group, an intermediate-pressure regulating valve group, and a low-pressure regulating valve group;

[0007] In which, the high-pressure steam temperature reduction and pressure reduction device is respectively connected to the high-pressure regulating valve group, the high-pressure cylinder, the boiler and the high-pressure heater through a high-pressure steam pipeline, and is used to cooperate with the high-pressure regulating valve group to adjust the pressure and temperature of the steam in the high-pressure steam pipeline; the medium-pressure steam temperature reduction and pressure reduction device is respectively connected to the medium-pressure regulating valve group, the medium-pressure cylinder, the boiler, the medium-pressure heater and the deaerator through a medium-pressure steam pipeline, and is used to cooperate with the medium-pressure regulating valve group to adjust the pressure and temperature of the steam in the medium-pressure steam pipeline; the low-pressure steam temperature reduction and pressure reduction device is respectively connected to the low-pressure regulating valve group, the low-pressure cylinder, the boiler and the low-pressure heater through a low-pressure steam pipeline, and is used to cooperate with the low-pressure regulating valve group to adjust the pressure and temperature of the steam in the low-pressure steam pipeline.

[0008] Furthermore, the high-pressure steam superheat and pressure reduction device includes a high-pressure pressure reducing valve, a high-pressure desuperheater and a high-pressure desuperheater water inlet regulating valve; wherein, the high-pressure steam superheat and pressure reduction device adjusts the pressure of the steam after the high-pressure steam superheat and pressure reduction device by changing the opening of the high-pressure pressure reducing valve, and adjusts the temperature of the steam after the high-pressure steam superheat and pressure reduction device by changing the opening of the high-pressure desuperheater water inlet regulating valve.

[0009] Furthermore, the medium-pressure steam superheat and pressure reduction device includes a medium-pressure pressure reducing valve, a medium-pressure desuperheater and a medium-pressure desuperheater water inlet regulating valve; wherein, the medium-pressure steam superheat and pressure reduction device adjusts the pressure of the steam after the medium-pressure steam superheat and pressure reduction device by changing the opening of the medium-pressure pressure reducing valve, and adjusts the temperature of the steam after the medium-pressure steam superheat and pressure reduction device by changing the opening of the medium-pressure desuperheater water inlet regulating valve.

[0010] Furthermore, the low-pressure steam superheat and pressure reduction device includes a low-pressure pressure reducing valve, a low-pressure desuperheater and a low-pressure desuperheater water inlet regulating valve; wherein, the low-pressure steam superheat and pressure reduction device adjusts the pressure of the steam after the low-pressure steam superheat and pressure reduction device by changing the opening of the low-pressure pressure reducing valve, and adjusts the temperature of the steam after the low-pressure steam superheat and pressure reduction device by changing the opening of the low-pressure desuperheater water inlet regulating valve.

[0011] Furthermore, the deep peak regulation system of the thermal power unit also includes: a high bypass valve, which is respectively connected to the high-pressure cylinder, the high-pressure steam temperature and pressure reduction device and the boiler, and adjusts the steam pressure after the high bypass valve by changing its own opening.

[0012] Furthermore, the deep peak regulation system of the thermal power unit also includes: a low bypass valve, which is respectively connected to the intermediate pressure cylinder, the intermediate pressure steam temperature and pressure reduction device, the low pressure steam temperature and pressure reduction device and the boiler, and adjusts the steam pressure after the low bypass valve by changing its own opening.

[0013] Furthermore, the high-pressure regulating valve group includes a first-extraction high-pressure regulating valve for regulating the steam inlet pressure of the first high-pressure heater and a second-extraction high-pressure regulating valve for regulating the steam inlet pressure of the second high-pressure heater.

[0014] Furthermore, the medium-pressure regulating valve group includes a three-pump medium-pressure regulating valve for regulating the steam inlet pressure of the third medium-pressure heater, a four-pump medium-pressure regulating valve for regulating the steam inlet pressure of the deaerator, and a five-pump medium-pressure regulating valve for regulating the steam inlet pressure of the fifth medium-pressure heater.

[0015] Furthermore, the low-pressure regulating valve group includes a sixth-extraction low-pressure regulating valve for regulating the steam inlet pressure of the sixth low-pressure heater and a seventh-extraction low-pressure regulating valve for regulating the steam inlet pressure of the seventh low-pressure heater.

[0016] Furthermore, the high-pressure regulating valve group also includes a first-stage steam extraction valve and a second-stage steam extraction valve; wherein, the main steam outlet of the boiler is respectively connected with the inlet of the high-pressure cylinder, the inlet of the high bypass valve and the inlet of the high-pressure steam superheating and pressure reducing device; the outlet of the high-pressure steam superheating and pressure reducing device is connected with the inlet of the first-stage high-pressure regulating valve and the inlet of the second-stage high-pressure regulating valve; the outlet pipe of the first-stage high-pressure regulating valve is connected to the outlet pipe of the first-stage steam extraction valve in parallel and then connected to the inlet of the heat release side of the first high-pressure heater; the outlet pipe of the second-stage high-pressure regulating valve is connected to the outlet pipe of the second-stage steam extraction valve in parallel and then connected to the inlet of the heat release side of the second high-pressure heater.

[0017] Furthermore, the medium-pressure regulating valve group also includes a three-stage steam extraction valve and a four-stage steam extraction valve; wherein the reheated steam outlet of the boiler is respectively connected to the inlet of the medium-pressure cylinder, the inlet of the medium-pressure steam cooling and pressure reducing device, the inlet of the low-pressure steam cooling and pressure reducing device and the inlet pipe of the low bypass valve; the outlet of the medium-pressure steam cooling and pressure reducing device is connected to the inlet of the three-extraction medium-pressure regulating valve, the inlet of the four-extraction medium-pressure regulating valve and the inlet of the five-extraction medium-pressure regulating valve; the outlet pipe of the three-extraction medium-pressure regulating valve is connected to the inlet of the heat release side of the third medium-pressure heater after being connected in a pipe connection with the outlet pipe of the three-stage steam extraction valve; the outlet pipe of the four-extraction medium-pressure regulating valve is connected to the inlet of the heat release side of the deaerator after being connected in a pipe connection with the outlet pipe of the four-stage steam extraction valve; the outlet pipe of the five-extraction medium-pressure regulating valve is connected to the inlet of the heat release side of the fifth medium-pressure heater after being connected in a pipe connection with the outlet pipe of the five-stage steam extraction valve.

[0018] Furthermore, the low-pressure regulating valve group also includes a six-stage steam extraction valve and a seven-stage steam extraction valve; wherein, the outlet of the low-pressure steam temperature and pressure reduction device is connected to the inlet of the six-stage low-pressure regulating valve and the inlet of the seven-stage low-pressure regulating valve; the outlet pipe of the six-stage low-pressure regulating valve is connected to the outlet pipe of the six-stage steam extraction valve in parallel and then connected to the inlet of the heat release side of the sixth low-pressure heater; the outlet pipe of the seven-stage low-pressure regulating valve is connected to the outlet pipe of the seven-stage steam extraction valve in parallel and then connected to the inlet of the heat release side of the seventh low-pressure heater.

[0019] Furthermore, the outlet pipe of the high bypass valve is connected to the exhaust pipe of the high-pressure cylinder in parallel and then communicated with the reheater inlet of the boiler.

[0020] Furthermore, the outlet pipe of the low bypass valve is connected to the inlet of the condenser.

[0021] In a second aspect, the present application provides a method for deep peak regulation of a thermal power plant, which is applied to the deep peak regulation system of the thermal power plant, comprising:

[0022] When a deep peak regulation instruction is received and the system load cannot be reduced, the low-pressure steam desuperheating and pressure reduction device is controlled to open, the sixth-stage extraction valve and the seventh-stage extraction valve are closed, and the sixth-stage extraction low-pressure regulating valve and the seventh-stage extraction low-pressure regulating valve are opened, so that the steam before the low bypass valve directly enters the sixth low-pressure heater and the seventh low-pressure heater for heat release;

[0023] The intermediate-pressure steam desuperheating and pressure reduction device is controlled to be open, the fifth-stage extraction valve, the fourth-stage extraction valve, and the third-stage extraction valve are closed, and the fifth-stage extraction intermediate-pressure regulating valve, the fourth-stage extraction intermediate-pressure regulating valve, and the third-stage extraction intermediate-pressure regulating valve are opened, so that the steam before the low bypass valve directly enters the third intermediate-pressure heater, the fifth intermediate-pressure heater, and the deaerator for heat release;

[0024] Control the high-pressure steam temperature and pressure reduction device to open, the second-stage steam extraction valve and the first-stage steam extraction valve to close, and the second-stage high-pressure regulating valve and the first-stage high-pressure regulating valve to open, so that the steam before the high bypass valve directly enters the first high-pressure heater and the second high-pressure heater for heat release.

[0025] In a third aspect, the present application provides a deep peak-shaving device for a thermal power plant, which is applied to the deep peak-shaving method for a thermal power plant, comprising:

[0026] The first deep peak shaving control module is used to control the low-pressure steam temperature and pressure reduction device to open, the sixth-stage steam extraction valve and the seventh-stage steam extraction valve to close, and the sixth-stage low-pressure regulating valve and the seventh-stage low-pressure regulating valve to open when receiving the deep peak shaving instruction and the system load cannot be reduced, so that the steam before the low bypass valve directly enters the sixth low-pressure heater and the seventh low-pressure heater for heat release;

[0027] The second deep peak shaving control module is used to control the opening of the intermediate-pressure steam desuperheating and pressure reduction device, the closing of the fifth-stage extraction valve, the fourth-stage extraction valve, and the third-stage extraction valve, and the opening of the fifth-stage extraction intermediate-pressure regulating valve, the fourth-stage extraction intermediate-pressure regulating valve, and the third-stage extraction intermediate-pressure regulating valve, so that the steam before the low bypass valve directly enters the third intermediate-pressure heater, the fifth intermediate-pressure heater, and the deaerator for heat release;

[0028] The third deep peak regulation control module is used to control the opening of the high-pressure steam temperature and pressure reduction device, the closing of the second-stage steam extraction valve and the first-stage steam extraction valve, and the opening of the second-stage high-pressure regulating valve and the first-stage high-pressure regulating valve, so that the steam before the high bypass valve directly enters the first high-pressure heater and the second high-pressure heater for heat release.

[0029] In a fourth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the deep peak regulation method for a thermal power unit when executing the program.

[0030] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for deep peak regulation of a thermal power unit.

[0031] In a sixth aspect, the present application provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements the steps of the method for deep peak regulation of a thermal power unit.

[0032] In response to the problems in the existing technology, the deep peak-shaving system, method and device for thermal power units provided in this application can be used in heating units to further improve the unit's thermal and electrical decoupling capabilities, and are also applicable to pure condensing units, which can further reduce the unit load and improve the unit's deep peak-shaving capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a structural diagram of the deep peak regulation system of a thermal power unit in an embodiment of the present application;

[0035] Figure 2 This is one of the flow charts of the deep peak regulation method for thermal power units in the embodiment of the present application;

[0036] Figure 3 This is a structural diagram of a deep peak-shaving device for a thermal power unit in an embodiment of the present application;

[0037] Figure 4 Flowchart 2 of the deep peak regulation method for thermal power units in the embodiment of the present application;

[0038] Figure 5 Schematic diagram of the structure of the electronic device in the embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] The acquisition, storage, use and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0041] In one embodiment, see Figure 1In order to reduce the load of thermal power units and improve the deep peak-shaving capability of thermal power units, the present application provides a deep peak-shaving system for thermal power units, including a high-pressure cylinder 1, an intermediate-pressure cylinder 2, a low-pressure cylinder 3, a boiler 4, a deaerator 27, a high-pressure heater, an intermediate-pressure heater, and a low-pressure heater, and further including: a high-pressure steam temperature and pressure reduction device 7, an intermediate-pressure steam temperature and pressure reduction device 8, a low-pressure steam temperature and pressure reduction device 9, a high-pressure regulating valve group, an intermediate-pressure regulating valve group, and a low-pressure regulating valve group;

[0042] Among them, the high-pressure steam temperature reduction and pressure reduction device 7 is respectively connected to the high-pressure regulating valve group, the high-pressure cylinder 1, the boiler 4 and the high-pressure heater through a high-pressure steam pipeline, and is used to cooperate with the high-pressure regulating valve group to adjust the pressure and temperature of the steam in the high-pressure steam pipeline; the medium-pressure steam temperature reduction and pressure reduction device 8 is respectively connected to the medium-pressure regulating valve group, the medium-pressure cylinder 2, the boiler 4, the medium-pressure heater and the deaerator 27 through a medium-pressure steam pipeline, and is used to cooperate with the medium-pressure regulating valve group to adjust the pressure and temperature of the steam in the medium-pressure steam pipeline; the low-pressure steam temperature reduction and pressure reduction device 9 is respectively connected to the low-pressure regulating valve group, the low-pressure cylinder, the boiler 4 and the low-pressure heater through a low-pressure steam pipeline, and is used to cooperate with the low-pressure regulating valve group to adjust the pressure and temperature of the steam in the low-pressure steam pipeline.

[0043] This application sets up high-pressure, medium-pressure and low-pressure steam temperature and pressure reduction devices according to the different heating steam pressures and temperatures of each heater, so that the steam inlet parameters of each heater can be adjusted more accurately.

[0044] In one embodiment, the high-pressure steam superheating and pressure reduction device 7 includes a high-pressure pressure reducing valve, a high-pressure desuperheater, and a high-pressure desuperheater water inlet regulating valve; wherein, the high-pressure steam superheating and pressure reduction device 7 adjusts the pressure of the steam after the high-pressure steam superheating and pressure reduction device 7 by changing the opening of the high-pressure pressure reducing valve, and adjusts the temperature of the steam after the high-pressure steam superheating and pressure reduction device 7 by changing the opening of the high-pressure desuperheater water inlet regulating valve.

[0045] In one embodiment, the deep peak regulation system of the thermal power unit further includes: a high bypass valve 5, which is respectively connected to the high-pressure cylinder 1, the high-pressure steam temperature and pressure reduction device 7 and the boiler 4, and adjusts the steam pressure after the high bypass valve by changing its own opening.

[0046] In one embodiment, the outlet pipe of the high bypass valve 5 is connected to the exhaust pipe of the high-pressure cylinder 1 and then connected to the reheater inlet of the boiler 4.

[0047] In one embodiment, the high-pressure regulating valve group includes a first-extraction high-pressure regulating valve 10 for regulating the steam inlet pressure of the first high-pressure heater 24 and a second-extraction high-pressure regulating valve 12 for regulating the steam inlet pressure of the second high-pressure heater 25 .

[0048] In one embodiment, the high-pressure regulating valve group further includes a first-stage steam extraction valve 11 and a second-stage steam extraction valve 13; wherein, the main steam outlet of the boiler 4 is respectively connected to the inlet of the high-pressure cylinder 1, the inlet of the high-pressure bypass valve 5 and the inlet of the high-pressure steam superheating and pressure reducing device 7; the outlet of the high-pressure steam superheating and pressure reducing device 7 is connected to the inlet of the first-stage high-pressure regulating valve 10 and the inlet of the second-stage high-pressure regulating valve 12; the outlet pipe of the first-stage high-pressure regulating valve 10 is connected to the outlet pipe of the first-stage steam extraction valve 11 in parallel and then connected to the inlet of the heat release side of the first high-pressure heater 24; the outlet pipe of the second-stage high-pressure regulating valve 12 is connected to the outlet pipe of the second-stage steam extraction valve 13 in parallel and then connected to the inlet of the heat release side of the second high-pressure heater 25.

[0049] It can be understood that the present application adds a high-pressure steam cooling and pressure reduction device, and part of the main steam flows through the high-pressure steam cooling and pressure reduction device and is divided into two paths. One path enters the first high-pressure heater 24 after the pressure is adjusted by the first high-pressure regulating valve 10; the other path enters the second high-pressure heater 25 after the pressure is adjusted by the second high-pressure regulating valve 12.

[0050] In conventional thermal power units, the heating steam sources for the first high-pressure heater 24 and the second high-pressure heater 25 come from the first-stage extraction valve 11 and the second-stage extraction valve 13 of the high-pressure cylinder, respectively. In the embodiment of the present application, the main steam after temperature reduction and pressure reduction can directly enter the high-pressure heater to release heat, thereby replacing the outlet steam of the first-stage extraction valve 11 and the second-stage extraction valve 13 for heat release. The outlet steam of the first-stage extraction valve 11 and the second-stage extraction valve 13 is the extraction steam released by the main steam after the high-pressure cylinder performs work and generates electricity. In the embodiment of the present application, the main steam after temperature reduction and pressure reduction (i.e., the steam before the high bypass valve) fails to enter the high-pressure cylinder to perform work. Therefore, the power generation capacity of the unit can be further reduced while the main steam flow remains unchanged.

[0051] It should be noted that the steam before the high bypass valve, the steam before the intermediate bypass valve, and the steam before the low bypass valve all refer to the steam that reaches the valve body but does not enter the valve body. The steam after the high bypass valve, the steam after the intermediate bypass valve, and the steam after the low bypass valve all refer to the steam that flows through the valve body.

[0052] In one embodiment, the medium-pressure steam superheat and pressure reduction device 8 includes a medium-pressure pressure reducing valve, a medium-pressure desuperheater and a medium-pressure desuperheater water inlet regulating valve; wherein, the medium-pressure steam superheat and pressure reduction device 8 adjusts the pressure of the steam after the medium-pressure steam superheat and pressure reduction device 8 by changing the opening of the medium-pressure pressure reducing valve, and adjusts the temperature of the steam after the medium-pressure steam superheat and pressure reduction device 8 by changing the opening of the medium-pressure desuperheater water inlet regulating valve.

[0053] In one embodiment, the medium-pressure regulating valve group includes a three-extraction medium-pressure regulating valve 14 for regulating the steam inlet pressure of the third medium-pressure heater 26, a four-extraction medium-pressure regulating valve 15 for regulating the steam inlet pressure of the deaerator 27, and a five-extraction medium-pressure regulating valve 18 for regulating the steam inlet pressure of the fifth medium-pressure heater 28.

[0054] In one embodiment, the medium-pressure regulating valve group further includes a three-stage steam extraction valve 16 and a four-stage steam extraction valve 17; wherein the reheat steam outlet of the boiler 4 is respectively connected to the inlet of the medium-pressure cylinder 2, the inlet of the medium-pressure steam temperature reduction and pressure reduction device 8, the inlet of the low-pressure steam temperature reduction and pressure reduction device 9, and the inlet pipe of the low bypass valve 6; the outlet of the medium-pressure steam temperature reduction and pressure reduction device 8 is connected to the inlet of the three-stage medium-pressure regulating valve 14, the inlet of the four-stage medium-pressure regulating valve 15, and the inlet of the five-stage medium-pressure regulating valve 18. the outlet pipe of the three-stage extraction medium-pressure regulating valve 14 is connected to the outlet pipe of the three-stage extraction valve 16 and then connected to the heat release side inlet of the third medium-pressure heater 26; the outlet pipe of the four-stage extraction medium-pressure regulating valve 15 is connected to the outlet pipe of the four-stage extraction valve 17 and then connected to the heat release side inlet of the deaerator 27; the outlet pipe of the five-stage extraction medium-pressure regulating valve 18 is connected to the outlet pipe of the five-stage extraction valve 19 and then connected to the heat release side inlet of the fifth medium-pressure heater 28.

[0055] It can be understood that the embodiment of the present application is additionally provided with a medium-pressure steam desuperheating and decompression device. Part of the reheated steam flows through the medium-pressure steam desuperheating and decompression device and is divided into three paths. One path passes through the third-extraction medium-pressure regulating valve 14 to adjust the pressure and then enters the third medium-pressure heater 26; one path passes through the fourth-extraction medium-pressure regulating valve 15 to adjust the pressure and then enters the deaerator 27; and one path passes through the fifth-extraction medium-pressure regulating valve 18 to adjust the pressure and then enter the fifth medium-pressure heater 28. The embodiment of the present application allows the reheated steam after desuperheating and decompression to directly enter the medium-pressure heater to release heat.

[0056] In conventional thermal power plants, the heating steam sources for the third intermediate-pressure heater 26, deaerator 27, and fifth intermediate-pressure heater 28 are derived from the intermediate-pressure cylinder's third-stage extraction valve 16, fourth-stage extraction valve 17, and fifth-stage extraction valve 19, respectively. The outlet steam from the third-stage extraction valve 16, fourth-stage extraction valve 17, and fifth-stage extraction valve 19 is the reheated steam released after generating power in the intermediate-pressure cylinder. In the present embodiment, some of the reheated steam (i.e., steam before the low bypass valve) is prevented from entering the intermediate-pressure cylinder to generate power. This allows the unit's power generation to be further reduced while maintaining the unit's main steam flow rate.

[0057] In one embodiment, the low-pressure steam superheat and pressure reduction device 9 includes a low-pressure pressure reducing valve, a low-pressure desuperheater and a low-pressure desuperheater water inlet regulating valve; wherein, the low-pressure steam superheat and pressure reduction device 9 adjusts the pressure of the steam after the low-pressure steam superheat and pressure reduction device 9 by changing the opening of the low-pressure pressure reducing valve, and adjusts the temperature of the steam after the low-pressure steam superheat and pressure reduction device 9 by changing the opening of the low-pressure desuperheater water inlet regulating valve.

[0058] In one embodiment, the deep peak regulation system of the thermal power unit further includes: a low-pressure bypass valve 6, which is respectively connected to the intermediate-pressure cylinder 2, the intermediate-pressure steam temperature and pressure reduction device 8, the low-pressure steam temperature and pressure reduction device 9 and the boiler 4, and adjusts the steam pressure after the low-pressure bypass valve by changing its own opening.

[0059] In one embodiment, the outlet pipe of the low bypass valve 6 is connected to the inlet of the condenser.

[0060] In one embodiment, the low-pressure regulating valve group includes a sixth-extraction low-pressure regulating valve 20 for regulating the steam inlet pressure of the sixth low-pressure heater 29 and a seventh-extraction low-pressure regulating valve 22 for regulating the steam inlet pressure of the seventh low-pressure heater 30 .

[0061] In one embodiment, the low-pressure regulating valve group further includes a six-stage steam extraction valve 21 and a seven-stage steam extraction valve 23; wherein, the outlet of the low-pressure steam temperature and pressure reduction device 9 is connected to the inlet of the six-stage low-pressure regulating valve 20 and the inlet of the seven-stage low-pressure regulating valve 22; the outlet pipe of the six-stage low-pressure regulating valve 20 and the outlet pipe of the six-stage steam extraction valve 21 are connected in parallel to the inlet of the heat release side of the sixth low-pressure heater 29; the outlet pipe of the seven-stage low-pressure regulating valve 22 and the outlet pipe of the seven-stage steam extraction valve 23 are connected in parallel to the inlet of the heat release side of the seventh low-pressure heater 30.

[0062] It can be understood that the embodiment of the present application adds a low-pressure steam cooling and pressure reduction device, and part of the reheated steam flows through the low-pressure steam cooling and pressure reduction device and is divided into two paths, one of which enters the sixth low-pressure heater 29 after the pressure is adjusted by the six-extraction low-pressure regulating valve 20; the other enters the seventh low-pressure heater 30 after the pressure is adjusted by the seven-extraction low-pressure regulating valve 22; the embodiment of the present application allows the reheated steam after the cooling and pressure reduction to directly enter the low-pressure heater, thereby heating the feed water.

[0063] In conventional thermal power plants, the heating steam source for the sixth and seventh low-pressure heaters 29 and 30 comes from the sixth and seventh stage extraction valves 21 and 23, respectively, of the low-pressure cylinders. The steam exiting the sixth and seventh stage extraction valves 21 and 23 is the exhaust steam from the intermediate-pressure cylinders after the low-pressure cylinders generate power. In this embodiment, some of the reheated steam (i.e., steam before the low-pressure bypass valves) is prevented from entering the turbines for power generation. This allows the unit's power generation to be further reduced while maintaining the unit's main steam flow.

[0064] From the above description, it can be seen that the deep peak-shaving system of thermal power units provided in this application can be used in heating units to further improve the thermal and electric decoupling capabilities of the units, and is also applicable to pure condensing units, which can further reduce the unit load and improve the deep peak-shaving capabilities of the units.

[0065] In one embodiment, see Figure 4 In order to reduce the load of thermal power units and improve the deep peak-shaving capability of thermal power units, the present application provides a deep peak-shaving method for thermal power units, which is applied to the deep peak-shaving system of thermal power units, comprising:

[0066] S101: When a deep peak load regulation instruction is received and the system load cannot be reduced, the low-pressure steam desuperheating and pressure reduction device 9 is controlled to open, the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 are closed, and the sixth-stage low-pressure regulating valve 20 and the seventh-stage low-pressure regulating valve 22 are opened, so that the steam before the low bypass valve directly enters the sixth low-pressure heater 29 and the seventh low-pressure heater 30 for heat release, replacing the outlet steam of the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 for heat release;

[0067] It should be noted that after step S101 is completed, that is, the low-pressure steam temperature and pressure reduction device 9 is opened, the six-stage steam extraction valve 21 and the seven-stage steam extraction valve 23 are closed, and the six-stage low-pressure regulating valve 20 and the seven-stage low-pressure regulating valve 22 are opened; if the unit load is still greater than the target load required by the power grid, step S102 is performed.

[0068] S102: The intermediate-pressure steam desuperheating and pressure reduction device 8 is controlled to be open, the fifth-stage extraction valve 19, the fourth-stage extraction valve 17, and the third-stage extraction valve 16 are closed, and the fifth-stage extraction intermediate-pressure regulating valve 18, the fourth-stage extraction intermediate-pressure regulating valve 15, and the third-stage extraction intermediate-pressure regulating valve 14 are opened, so that the steam before the low bypass valve directly enters the third intermediate-pressure heater 26, the fifth intermediate-pressure heater 28, and the deaerator 27 for heat release, replacing the outlet steam of the fifth-stage extraction valve 19, the fourth-stage extraction valve 17, and the third-stage extraction valve 16 for heat release;

[0069] It should be noted that after step S102 is completed, that is, the high-pressure steam temperature and pressure reduction device 7 is opened, the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 are closed, the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10 are opened, if the unit load is still greater than the target load required by the power grid, step S103 is performed.

[0070] S103: Control the high-pressure steam temperature and pressure reduction device 7 to open, the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 to close, and the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10 to open, so that the steam before the high bypass valve directly enters the first high-pressure heater 24 and the second high-pressure heater 25 for heat release, replacing the outlet steam of the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 for heat release.

[0071] It should be noted that, see Figure 2 When the power grid dispatching requires deep peak regulation and the boiler load can no longer be reduced, the low-pressure steam temperature and pressure reduction device 9 can be opened, and the low-pressure steam temperature and pressure reduction device 9 is put into automatic temperature and pressure adjustment control; the pressure adjustment set value can be but not limited to be preset to 0.5MPa, and the temperature adjustment set value can be but not limited to be preset to 200℃.

[0072] The opening of the seven-pump low-pressure regulating valve refers to putting the seven-pump low-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0073] The opening of the six-pump low-pressure regulating valve refers to putting the six-pump low-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0074] Similarly, when the medium-pressure steam temperature and pressure reduction device 8 is turned on, the medium-pressure steam temperature and pressure reduction device 8 is put into automatic temperature and pressure adjustment control; the pressure adjustment set value can be but is not limited to being preset to 2MPa, and the temperature adjustment set value can be but is not limited to being preset to 400℃.

[0075] The opening of the five-pump medium-pressure regulating valve refers to putting the five-pump medium-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0076] The opening of the four-pump medium-pressure regulating valve refers to putting the four-pump medium-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0077] The opening of the three-pump medium-pressure regulating valve refers to putting the three-pump medium-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0078] Similarly, when the high-pressure steam cooling and pressure reducing device 7 is turned on, the high-pressure steam cooling and pressure reducing device 7 is put into automatic temperature and pressure adjustment control; the pressure adjustment constant value can be but not limited to be preset to 4MPa, and the temperature adjustment constant value can be but not limited to be preset to 420℃.

[0079] The opening of the secondary high-pressure regulating valve refers to putting the secondary high-pressure regulating valve into the automatic pressure control mode, and the pressure setting value tracks the current value;

[0080] The opening of the high-pressure regulating valve refers to putting the high-pressure regulating valve into an automatic pressure control mode, and the pressure setting value tracks the current value.

[0081] It can be understood that the embodiment of the present application is equipped with high-pressure, medium-pressure and low-pressure steam temperature and pressure reduction devices according to the different heating steam pressures and temperatures of each heater, so as to more accurately adjust the steam inlet parameters of each heater.

[0082] This application divides the extraction steam of the unit into high-pressure extraction steam (one extraction high-pressure regulating valve 10, two extraction high-pressure regulating valve 12), medium-pressure extraction steam (three extraction medium-pressure regulating valve 14, four extraction medium-pressure regulating valve 15, five extraction medium-pressure regulating valve 18) and low-pressure extraction steam (six extraction low-pressure regulating valve 20, seven extraction low-pressure regulating valve 22) according to the pressure and temperature characteristics of the extraction steam. The high-pressure extraction steam has a large mass flow rate, and during deep peak regulation, the main steam with high steam quality is used to replace the high-pressure extraction steam at each level to enter each high-pressure heater for heat release. Therefore, when the high-pressure extraction steam is replaced, the reduction in unit power is the largest, followed by the medium-pressure extraction steam, and the low-pressure extraction steam is the smallest. The embodiment of this application performs deep peak regulation of the unit according to the order of peak regulation capacity from small to large.

[0083] When the unit receives the deep peak regulation instruction from the dispatching system, the low-pressure steam temperature and pressure reduction device 9 is first opened, the six-stage steam extraction valve 21 and the seven-stage steam extraction valve 23 are closed, and the six-stage low-pressure regulating valve 20 and the seven-stage low-pressure regulating valve 22 are opened, so that the steam before the low bypass valve can directly enter the sixth low-pressure heater 29 and the seventh low-pressure heater 30 to release heat, replacing the outlet steam of the six-stage steam extraction valve 21 and the seven-stage steam extraction valve 23 for heat release. The outlet steam in the six-stage steam extraction valve 21 and the seven-stage steam extraction valve 23 is the exhaust steam released by the medium-pressure cylinder after the low-pressure cylinder performs work and generates electricity. In the embodiment of the present application, part of the reheated steam (i.e., the steam before the low bypass valve) fails to enter the steam turbine to perform work and generate electricity, so the power generation power of the unit can be further reduced while the main steam flow of the unit remains unchanged.

[0084] After the low-pressure steam extraction is replaced, that is, the low-pressure steam temperature and pressure reduction device 9 is opened, the six-stage steam extraction valve 21 and the seven-stage steam extraction valve 23 are closed, and the six-stage low-pressure regulating valve 20 and the seven-stage low-pressure regulating valve 22 are opened; if the unit load is still greater than the target load required by the power grid, medium-pressure steam extraction is carried out for replacement.

[0085] The medium-pressure steam temperature and pressure reduction device 8 is opened, the five-stage extraction valve 19, the four-stage extraction valve 17 and the three-stage extraction valve 16 are closed, and the five-stage extraction medium-pressure regulating valve 18, the four-stage extraction medium-pressure regulating valve 15 and the three-stage extraction medium-pressure regulating valve 14 are opened, so that the steam before the low bypass valve can be directly fed into the third medium-pressure heater 26, the fifth medium-pressure heater 28 and the deaerator 27 to release heat, replacing the three-stage extraction valve 16, the five-stage extraction valve 19 and the four-stage extraction valve 17. The outlet steam in the three-stage extraction valve 16, the five-stage extraction valve 19 and the four-stage extraction valve 17 is the extraction steam released after the reheated steam in the medium-pressure cylinder performs work and generates electricity. In the embodiment of the present application, part of the reheated steam (i.e., the steam before the low bypass valve) fails to enter the medium-pressure cylinder to perform work and generate electricity, so the power generation capacity of the unit can be further reduced while the main steam flow of the unit remains unchanged.

[0086] After the medium-pressure steam extraction is replaced, the medium-pressure steam temperature and pressure reduction device 8 is opened, the five-stage steam extraction valve 19, the four-stage steam extraction valve 17 and the three-stage steam extraction valve 16 are closed, and the five-stage medium-pressure regulating valve 18, the four-stage medium-pressure regulating valve 15 and the three-stage medium-pressure regulating valve 14 are opened; if the unit load is still greater than the target load required by the power grid, high-pressure steam extraction is carried out for replacement.

[0087] Open the high-pressure steam temperature reduction and pressure reduction device 7, close the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11, open the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10, so as to use the steam before the high bypass valve to directly enter the first high-pressure heater 24 and the second high-pressure heater 25 to release heat, replacing the outlet steam of the first-stage steam extraction valve 11 and the second-stage steam extraction valve 13 to release heat. The outlet steam in the first-stage steam extraction valve 11 and the second-stage steam extraction valve 13 is the extraction steam released by the main steam after the high-pressure cylinder performs work and generates electricity. In the embodiment of the present application, part of the main steam (i.e., the steam before the high bypass valve) fails to enter the high-pressure cylinder to perform work and generate electricity. Therefore, the power generation power of the unit can be further reduced while the main steam flow of the unit remains unchanged.

[0088] From the above description, it can be seen that the deep peak-shaving method of thermal power units provided in this application can be applied in heating units to further improve the thermal and electric decoupling capabilities of the units, and is also applicable to pure condensing units, which can further reduce the unit load and improve the deep peak-shaving capability of the units.

[0089] Based on the same inventive concept, the embodiments of the present application also provide a deep peak-shaving device for a thermal power plant, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of solving the problem by the deep peak-shaving device for a thermal power plant is similar to the deep peak-shaving method for a thermal power plant, the implementation of the deep peak-shaving device for a thermal power plant can refer to the implementation of the method based on software performance benchmark determination, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and conceived.

[0090] In one embodiment, see Figure 3 In order to reduce the load of thermal power units and improve the deep peak regulation capability of thermal power units, the present application provides a deep peak regulation device for thermal power units, which is applied to the deep peak regulation method for thermal power units, comprising:

[0091] The first deep peak shaving control module 301 is configured to, upon receiving a deep peak shaving instruction and the system load being unable to decrease, control the low-pressure steam temperature and pressure reduction device 9 to open, the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 to close, and the sixth-stage low-pressure regulating valve 20 and the seventh-stage low-pressure regulating valve 22 to open, so that the steam before the low bypass valve directly enters the sixth low-pressure heater 29 and the seventh low-pressure heater 30 for heat release, replacing the outlet steam of the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 for heat release;

[0092] The second deep peak shaving control module 302 is configured to control the opening of the intermediate-pressure steam desuperheating and pressure reduction device 8, the closing of the fifth-stage extraction valve 19, the fourth-stage extraction valve 17, and the third-stage extraction valve 16, and the opening of the fifth-stage extraction intermediate-pressure regulating valve 18, the fourth-stage extraction intermediate-pressure regulating valve 15, and the third-stage extraction intermediate-pressure regulating valve 14, so that the steam before the low bypass valve directly enters the third intermediate-pressure heater 26, the fifth intermediate-pressure heater 28, and the deaerator 27 for heat release, replacing the outlet steam of the third-stage extraction valve 16, the fifth-stage extraction valve 18, and the fourth-stage extraction valve 17 for heat release;

[0093] The third deep peak regulation control module 303 is used to control the high-pressure steam temperature and pressure reduction device 7 to open, the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 to close, and the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10 to open, so that the steam before the high bypass valve directly enters the first high-pressure heater 24 and the second high-pressure heater 25 for heat release, replacing the outlet steam of the first-stage steam extraction valve 11 and the second-stage steam extraction valve 13 for heat release.

[0094] From a hardware perspective, in order to reduce the load of thermal power units and improve their deep peak-shaving capabilities, the present application provides an embodiment of an electronic device for implementing all or part of the deep peak-shaving method for thermal power units. The electronic device specifically includes the following:

[0095] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other via the bus; the communication interface is used to realize information transmission between the deep peak-shaving device of the thermal power unit and related equipment such as the core business system, user terminal and related database; the logic controller can be a desktop computer, tablet computer and mobile terminal, etc., but this embodiment is not limited to this. In this embodiment, the logic controller can be implemented with reference to the embodiment of the deep peak-shaving method of the thermal power unit and the embodiment of the deep peak-shaving device of the thermal power unit in the embodiment, and their contents are merged here, and the repeated parts are not repeated.

[0096] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0097] In practical applications, portions of the deep peak-shaving method for thermal power units can be executed on the electronic device side as described above, or all operations can be performed on the client device. The specific selection can be based on the processing capabilities of the client device and the limitations of the user's usage scenario. This application does not impose any restrictions on this. If all operations are performed on the client device, the client device may also include a processor.

[0098] The client device may include a communication module (i.e., a communication unit) that can establish a communication connection with a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0099] Figure 5 Schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 5 As shown, the electronic device 9600 may include a central processing unit 9100 and a memory 9140; the memory 9140 is coupled to the central processing unit 9100. It is worth noting that the Figure 5 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0100] In one embodiment, the deep peak regulation method function of the thermal power unit can be integrated into the central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0101] S101: When a deep peak load regulation instruction is received and the system load cannot be reduced, the low-pressure steam temperature and pressure reduction device 9 is controlled to open, the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 are closed, and the sixth-stage low-pressure regulating valve 20 and the seventh-stage low-pressure regulating valve 22 are opened, so that the steam before the low bypass valve directly enters the sixth low-pressure heater 29 and the seventh low-pressure heater 30 for heat release;

[0102] S102: Control the intermediate-pressure steam desuperheating and pressure reduction device 8 to open, close the fifth-stage steam extraction valve 19, the fourth-stage steam extraction valve 17, and the third-stage steam extraction valve 16, and open the fifth-stage intermediate-pressure regulating valve 18, the fourth-stage intermediate-pressure regulating valve 15, and the third-stage intermediate-pressure regulating valve 14, so that the steam before the low bypass valve directly enters the third intermediate-pressure heater 26, the fifth intermediate-pressure heater 28, and the deaerator 27 for heat release;

[0103] S103: Control the high-pressure steam temperature and pressure reduction device 7 to open, the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 to close, and the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10 to open, so that the steam before the high bypass valve directly enters the first high-pressure heater 24 and the second high-pressure heater 25 for heat release.

[0104] From the above description, it can be seen that the deep peak-shaving system, method and device for thermal power units provided in this application can be used in heating units to further improve the thermal and electric decoupling capabilities of the units, and are also applicable to pure condensing units, which can further reduce the unit load and improve the deep peak-shaving capabilities of the units.

[0105] In another embodiment, the deep peak-shaving device of the thermal power unit can be configured separately from the central processing unit 9100. For example, the data composite transmission device deep peak-shaving device of the thermal power unit can be configured as a chip connected to the central processing unit 9100, and the function of the deep peak-shaving method of the thermal power unit can be realized through the control of the central processing unit.

[0106] like Figure 5 As shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 5 In addition, the electronic device 9600 may also include all components shown in Figure 5 For components not shown, reference may be made to the prior art.

[0107] like Figure 5 As shown, the central processing unit 9100 is sometimes also referred to as a controller or operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0108] Memory 9140 can be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It can store the aforementioned failure-related information and also store programs that execute the relevant information. The CPU 9100 can execute the programs stored in memory 9140 to implement information storage or processing.

[0109] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 may be, for example, a keypad or touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0110] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), or a SIM card. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or processes for executing the operation of the electronic device 9600 by the central processing unit 9100.

[0111] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various driver programs for the electronic device's communication functions and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0112] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in a conventional mobile communication terminal.

[0113] Based on different communication technologies, multiple communication modules 9110 can be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing common telecommunication functions. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processing unit 9100, enabling local recording via the microphone 9132 and playback of stored audio via the speaker 9131.

[0114] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps of the method for deep peak shaving of a thermal power plant in the above-mentioned embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all steps of the method for deep peak shaving of a thermal power plant in the above-mentioned embodiment, where the execution subject is a server or a client, are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0115] S101: When a deep peak load regulation instruction is received and the system load cannot be reduced, the low-pressure steam temperature and pressure reduction device 9 is controlled to open, the sixth-stage steam extraction valve 21 and the seventh-stage steam extraction valve 23 are closed, and the sixth-stage low-pressure regulating valve 20 and the seventh-stage low-pressure regulating valve 22 are opened, so that the steam before the low bypass valve directly enters the sixth low-pressure heater (29) and the seventh low-pressure heater (30) for heat release;

[0116] S102: Control the medium-pressure steam temperature and pressure reduction device 8 to open, the fifth-stage steam extraction valve 19, the fourth-stage steam extraction valve 17 and the third-stage steam extraction valve 16 to close, and the fifth-stage medium-pressure regulating valve 18, the fourth-stage medium-pressure regulating valve 15 and the third-stage medium-pressure regulating valve 14 to open, so that the steam before the low bypass valve directly enters the third medium-pressure heater (26), the fifth medium-pressure heater (28) and the deaerator (27) for heat release;

[0117] S103: The high-pressure steam temperature and pressure reduction device 7 is controlled to be open, the second-stage steam extraction valve 13 and the first-stage steam extraction valve 11 are closed, and the second-stage high-pressure regulating valve 12 and the first-stage high-pressure regulating valve 10 are opened, so that the steam before the high bypass valve directly enters the first high-pressure heater (24) and the second high-pressure heater (25) for heat release.

[0118] From the above description, it can be seen that the deep peak-shaving system, method and device for thermal power units provided in this application can be used in heating units to further improve the thermal and electric decoupling capabilities of the units, and are also applicable to pure condensing units, which can further reduce the unit load and improve the deep peak-shaving capabilities of the units.

[0119] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, apparatus, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0123] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A deep peak regulation system for a thermal power unit, comprising a high-pressure cylinder (1), a medium-pressure cylinder (2), a low-pressure cylinder, a boiler (4), a deaerator (27), a high-pressure heater, a medium-pressure heater and a low-pressure heater, characterized in that: It also includes: a high-pressure steam temperature and pressure reduction device (7), a medium-pressure steam temperature and pressure reduction device (8), a low-pressure steam temperature and pressure reduction device (9), a high-pressure regulating valve group, a medium-pressure regulating valve group, and a low-pressure regulating valve group; wherein the high-pressure steam temperature-reducing and pressure-reducing device (7) is respectively connected to the high-pressure regulating valve group, the high-pressure cylinder (1), the boiler (4) and the high-pressure heater through a high-pressure steam pipeline, and is used to cooperate with the high-pressure regulating valve group to adjust the pressure and temperature of the steam in the high-pressure steam pipeline; the medium-pressure steam temperature-reducing and pressure-reducing device (8) is respectively connected to the medium-pressure regulating valve group, the medium-pressure cylinder (2), the boiler (4), the medium-pressure heater and the deaerator (27) through a medium-pressure steam pipeline, and is used to cooperate with the medium-pressure regulating valve group to adjust the pressure and temperature of the steam in the medium-pressure steam pipeline; the low-pressure steam temperature-reducing and pressure-reducing device (9) is respectively connected to the low-pressure regulating valve group, the low-pressure cylinder, the boiler (4) and the low-pressure heater through a low-pressure steam pipeline, and is used to cooperate with the low-pressure regulating valve group to adjust the pressure and temperature of the steam in the low-pressure steam pipeline; The high-pressure regulating valve group includes a high-pressure regulating valve (10) for regulating the steam inlet pressure of the first high-pressure heater (24); the high-pressure regulating valve group also includes a steam extraction valve (11); the outlet pipe of the high-pressure regulating valve (10) and the outlet pipe of the steam extraction valve (11) are connected to the heat release side inlet of the first high-pressure heater (24) after being connected.

2. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: The high-pressure steam temperature reduction and pressure reduction device (7) comprises a high-pressure pressure reducing valve, a high-pressure desuperheater, and a high-pressure desuperheater water inlet regulating valve; wherein the high-pressure steam temperature reduction and pressure reduction device (7) adjusts the pressure of the steam after the high-pressure steam temperature reduction and pressure reduction device (7) by changing the opening of the high-pressure pressure reducing valve, and adjusts the temperature of the steam after the high-pressure steam temperature reduction and pressure reduction device (7) by changing the opening of the high-pressure desuperheater water inlet regulating valve.

3. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: The medium-pressure steam superheating and pressure reduction device (8) comprises a medium-pressure pressure reducing valve, a medium-pressure desuperheater and a medium-pressure desuperheater water inlet regulating valve; wherein the medium-pressure steam superheating and pressure reduction device (8) adjusts the pressure of the steam after the medium-pressure steam superheating and pressure reduction device (8) by changing the opening of the medium-pressure pressure reducing valve, and adjusts the temperature of the steam after the medium-pressure steam superheating and pressure reduction device (8) by changing the opening of the medium-pressure desuperheater water inlet regulating valve.

4. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: The low-pressure steam superheating and pressure reduction device (9) comprises a low-pressure pressure reducing valve, a low-pressure desuperheater and a low-pressure desuperheater water inlet regulating valve; wherein the low-pressure steam superheating and pressure reduction device (9) adjusts the pressure of the steam after the low-pressure steam superheating and pressure reduction device (9) by changing the opening of the low-pressure pressure reducing valve, and adjusts the temperature of the steam after the low-pressure steam superheating and pressure reduction device (9) by changing the opening of the low-pressure desuperheater water inlet regulating valve.

5. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: Also includes: The high bypass valve (5) is respectively connected to the high-pressure cylinder (1), the high-pressure steam temperature and pressure reduction device (7) and the boiler (4), and adjusts the steam pressure after the high bypass valve by changing its own opening.

6. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: Also includes: The low-pressure bypass valve (6) is respectively connected to the intermediate-pressure cylinder (2), the intermediate-pressure steam temperature-reducing and pressure-reducing device (8), the low-pressure steam temperature-reducing and pressure-reducing device (9) and the boiler (4), and adjusts the steam pressure after the low-pressure bypass valve by changing its own opening.

7. The deep peak regulation system for thermal power generation units according to claim 5, characterized in that: The high-pressure regulating valve group further includes a second extraction high-pressure regulating valve (12) for regulating the steam inlet pressure of the second high-pressure heater (25).

8. The deep peak regulation system for thermal power generation units according to claim 6, characterized in that: The medium-pressure regulating valve group comprises a three-pump medium-pressure regulating valve (14) for regulating the steam inlet pressure of the third medium-pressure heater (26), a four-pump medium-pressure regulating valve (15) for regulating the steam inlet pressure of the deaerator (27), and a five-pump medium-pressure regulating valve (18) for regulating the steam inlet pressure of the fifth medium-pressure heater (28).

9. The deep peak regulation system for thermal power generation units according to claim 1, characterized in that: The low-pressure regulating valve group comprises a six-extraction low-pressure regulating valve (20) for regulating the steam inlet pressure of a sixth low-pressure heater (29) and a seven-extraction low-pressure regulating valve (22) for regulating the steam inlet pressure of a seventh low-pressure heater (30).

10. The deep peak regulation system for thermal power generation units according to claim 7, characterized in that: The high-pressure regulating valve group also includes a two-stage steam extraction valve (13); wherein the main steam outlet of the boiler (4) is respectively connected to the inlet of the high-pressure cylinder (1), the inlet of the high-pressure bypass valve (5) and the inlet of the high-pressure steam superheating and pressure-reducing device (7); the outlet of the high-pressure steam superheating and pressure-reducing device (7) is connected to the inlet of the first extraction high-pressure regulating valve (10) and the inlet of the second extraction high-pressure regulating valve (12); the outlet pipe of the second extraction high-pressure regulating valve (12) is connected to the outlet pipe of the second extraction valve (13) in parallel and then connected to the heat release side inlet of the second high-pressure heater (25).

11. The deep peak regulation system for thermal power generation units according to claim 10, characterized in that: The medium-pressure regulating valve group further includes a three-stage steam extraction valve (16) and a four-stage steam extraction valve (17); wherein the reheat steam outlet of the boiler (4) is respectively connected to the inlet of the medium-pressure cylinder (2), the inlet of the medium-pressure steam temperature reduction and pressure reduction device (8), the inlet of the low-pressure steam temperature reduction and pressure reduction device (9) and the inlet pipe of the low bypass valve (6); the outlet of the medium-pressure steam temperature reduction and pressure reduction device (8) is connected to the inlet of the three-stage medium-pressure regulating valve (14), the inlet of the four-stage medium-pressure regulating valve (15) and the inlet of the five-stage medium-pressure regulating valve (18). The outlet pipe of the three-stage extraction medium-pressure regulating valve (14) is connected to the outlet pipe of the three-stage extraction valve (16) and then connected to the heat release side inlet of the third medium-pressure heater (26); the outlet pipe of the four-stage extraction medium-pressure regulating valve (15) is connected to the outlet pipe of the four-stage extraction valve (17) and then connected to the heat release side inlet of the deaerator (27); the outlet pipe of the five-stage extraction medium-pressure regulating valve (18) is connected to the outlet pipe of the five-stage extraction valve (19) and then connected to the heat release side inlet of the fifth medium-pressure heater (28).

12. The deep peak regulation system for thermal power generation units according to claim 11, characterized in that: The low-pressure regulating valve group further comprises a six-stage steam extraction valve (21) and a seven-stage steam extraction valve (23); wherein, the outlet of the low-pressure steam temperature and pressure reduction device (9) is connected to the inlet of the six-stage low-pressure regulating valve (20) and the inlet of the seven-stage low-pressure regulating valve (22); the outlet pipe of the six-stage low-pressure regulating valve (20) and the outlet pipe of the six-stage steam extraction valve (21) are connected to the heat release side inlet of the sixth low-pressure heater (29); the outlet pipe of the seven-stage low-pressure regulating valve (22) and the outlet pipe of the seven-stage steam extraction valve (23) are connected to the heat release side inlet of the seventh low-pressure heater (30).

13. The deep peak regulation system for thermal power generation units according to claim 5, characterized in that: The outlet pipe of the high bypass valve (5) is connected to the exhaust pipe of the high-pressure cylinder (1) and then connected to the reheater inlet of the boiler (4).

14. The deep peak regulation system for thermal power generation units according to claim 6, characterized in that: The outlet pipe of the low bypass valve (6) is connected to the inlet of the condenser.

15. A deep peak regulation method for a thermal power plant, applied to the deep peak regulation system for a thermal power plant according to claim 12, characterized in that: include: When a deep peak regulation instruction is received and the system load cannot be reduced, the low-pressure steam temperature and pressure reduction device (9) is controlled to open, the sixth-stage steam extraction valve (21) and the seventh-stage steam extraction valve (23) are closed, and the sixth-stage low-pressure regulating valve (20) and the seventh-stage low-pressure regulating valve (22) are opened, so that the steam before the low bypass valve directly enters the sixth low-pressure heater (29) and the seventh low-pressure heater (30) for heat release; The medium-pressure steam temperature and pressure reduction device (8) is controlled to be opened, the fifth-stage steam extraction valve (19), the fourth-stage steam extraction valve (17) and the third-stage steam extraction valve (16) are closed, and the fifth-stage medium-pressure regulating valve (18), the fourth-stage medium-pressure regulating valve (15) and the third-stage medium-pressure regulating valve (14) are opened, so that the steam before the low bypass valve directly enters the third medium-pressure heater (26), the fifth medium-pressure heater (28) and the deaerator (27) for heat release; The high-pressure steam temperature and pressure reduction device (7) is controlled to be opened, the second-stage steam extraction valve (13) and the first-stage steam extraction valve (11) are closed, and the second-stage high-pressure regulating valve (12) and the first-stage high-pressure regulating valve (10) are opened, so that the steam before the high bypass valve directly enters the first high-pressure heater (24) and the second high-pressure heater (25) for heat release.

16. A deep peak regulation device for a thermal power plant, applied to the deep peak regulation method for a thermal power plant according to claim 15, characterized in that: include: A first deep peak regulation control module is used for controlling the low-pressure steam temperature and pressure reduction device (9) to open, the sixth-stage steam extraction valve (21) and the seventh-stage steam extraction valve (23) to close, and the sixth-stage low-pressure regulating valve (20) and the seventh-stage low-pressure regulating valve (22) to open when a deep peak regulation instruction is received and the system load cannot be reduced, so that the steam before the low bypass valve directly enters the sixth low-pressure heater (29) and the seventh low-pressure heater (30) for heat release; The second deep peak regulation control module is used to control the opening of the medium-pressure steam temperature and pressure reduction device (8), the closing of the fifth-stage steam extraction valve (19), the fourth-stage steam extraction valve (17) and the third-stage steam extraction valve (16), and the opening of the fifth-stage medium-pressure regulating valve (18), the fourth-stage medium-pressure regulating valve (15) and the third-stage medium-pressure regulating valve (14), so that the steam before the low bypass valve directly enters the third medium-pressure heater (26), the fifth medium-pressure heater (28) and the deaerator (27) for heat release; The third deep peak regulation control module is used to control the high-pressure steam temperature and pressure reduction device (7) to open, the second-stage steam extraction valve (13) and the first-stage steam extraction valve (11) to close, and the second-stage high-pressure regulating valve (12) and the first-stage high-pressure regulating valve (10) to open, so that the steam before the high bypass valve directly enters the first high-pressure heater (24) and the second high-pressure heater (25) for heat release.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the deep peak regulation method for thermal power units according to claim 15 are implemented.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the deep peak regulation method for thermal power units described in claim 15 are implemented.

19. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the deep peak regulation method for thermal power units described in claim 15 are implemented.

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