Power generation and steam supply system, control method, readable storage medium and electronic device

Abstract

The embodiment of the present application provides a kind of power generation and steam supply system, control method, readable storage medium and electronic equipment, belong to thermal power generation technical field.System includes: thermal power generation system, for power generation and produce heat re-steam;Common gas pipeline, the steam inlet end of common gas pipeline is connected the heat re-steam pipeline of thermal power generation system, and the gas outlet end is connected pressure reducing steam supply circuit and steam supply bypass;Pressure reducing steam supply circuit is used to when conducting, heat re-steam from thermal power generation system is decompressed and transported to temperature reduction mechanism;Steam supply bypass is used to when conducting, heat re-steam from thermal power generation system is transported to temperature reduction mechanism;Temperature reduction mechanism, the gas outlet end of temperature reduction mechanism is connected with gas supply main pipe, for heat re-steam is transported to gas supply main pipe after temperature reduction.The present application has simple structure, and the stability and reliability of system are high, effectively reduce the pressure loss caused by pressure reduction in steam supply under low load condition, improve the economic benefit of unit.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, specifically to a power generation and steam supply system, a control method for the power generation and steam supply system, a readable storage medium, and an electronic device. Background Technology

[0002] With the continuous development of urbanization and the national economy in my country, as well as the increasing demands for energy conservation and environmental protection, energy efficiency and cost in residential heating and industrial steam use have become key factors driving market development. Adopting large-scale, high-efficiency combined heat and power (CHP) systems for centralized heating and steam supply is a significant trend in domestic heating technology development. Currently, many large-scale CHP units in my country have become routine peak-shaving units, but their load factors fluctuate significantly, often operating at medium to low loads for extended periods. This poses new challenges to the safe production and refined management of power plants.

[0003] With the increasing demand for deep peak shaving in cogeneration units, the non-adjustment industrial steam extraction of some cogeneration power plants has been severely affected. The extraction capacity and the stability of extraction parameters under wide load operating conditions of the units cannot be effectively guaranteed, which directly affects the steam supply safety of the power plants. Summary of the Invention

[0004] The purpose of this invention is to provide a power generation and steam supply system that addresses the problem that, with the increasing demand for deep peak shaving in cogeneration units, the non-adjustable industrial steam extraction of some cogeneration power plants is severely affected, and the steam extraction capacity and the stability of steam extraction parameters under wide load operating conditions cannot be effectively guaranteed, directly affecting the steam supply safety of the power plant.

[0005] To achieve the above objectives, embodiments of the present invention provide a power generation and steam supply system, the system comprising:

[0006] A thermal power generation system is used to generate electricity and produce hot resteam. The thermal power generation system has hot resteam pipelines.

[0007] The common gas transmission pipeline, the pressure reducing steam supply circuit, and the steam supply bypass are connected. The steam inlet of the common gas transmission pipeline is connected to the hot reheat steam pipeline of the thermal power generation system, and the steam outlet is connected to the pressure reducing steam supply circuit and the steam supply bypass, respectively. The hot reheat steam generated by the thermal power generation system enters the pressure reducing steam supply circuit and the steam supply bypass through the hot reheat steam pipeline and the common gas transmission pipeline.

[0008] When the pressure-reducing steam supply circuit is turned on, it reduces the pressure of the hot reheat steam from the thermal power generation system and then delivers it to the desuperheating mechanism.

[0009] When the steam supply bypass is activated, it delivers hot reheated steam from the thermal power generation system to the desuperheating mechanism.

[0010] The cooling mechanism has its outlet end connected to the main gas supply pipe, and is used to cool the hot reheat steam before delivering it to the main gas supply pipe.

[0011] Optionally, the thermal power generation system includes:

[0012] A boiler, steam turbine generator set, condenser, condensate pump, low-pressure heater regenerative system, feedwater pump and high-pressure heater regenerative system are connected sequentially along the direction of medium flow to form a circulation loop;

[0013] The steam turbine generator set includes: a high-pressure cylinder, an intermediate-pressure cylinder, and a low-pressure cylinder;

[0014] The inlet end of the high-pressure cylinder is connected to the first steam outlet end of the boiler, the outlet end of the high-pressure cylinder is connected to the second steam inlet end of the boiler, and the second steam outlet end of the boiler is connected to the inlet end of the intermediate-pressure cylinder.

[0015] Optionally, a medium-pressure cylinder inlet steam regulating valve group is provided on the hot resteam pipeline near the inlet end of the medium-pressure cylinder. The medium-pressure cylinder inlet steam regulating valve group is used to regulate the steam pressure entering the common gas transmission pipeline.

[0016] Optionally, the common gas pipeline includes:

[0017] The first isolation valve, check valve, flow regulating valve, and second isolation valve are arranged sequentially along the direction of medium flow.

[0018] Optionally, the pressure-reducing steam supply circuit includes a pressure-reducing valve assembly.

[0019] Optionally, the steam supply bypass includes a third isolation valve.

[0020] Optionally, the cooling mechanism includes a cooler.

[0021] This invention also provides a control method for a power generation and steam supply system, applied to the aforementioned power generation and steam supply system, the method comprising:

[0022] Obtain the steam pressure value in the hot resteam pipeline and the pressure demand value of the steam supply header;

[0023] If the steam pressure value is greater than the pressure requirement value, the pressure reducing steam supply circuit is turned on and the steam supply bypass is turned off. The opening of the pressure reducing valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value.

[0024] If the steam pressure value is equal to the pressure demand value, then the pressure reducing steam supply circuit is disconnected and the steam supply bypass is opened.

[0025] If the steam pressure value is less than the pressure requirement value, the pressure reducing steam supply circuit is disconnected, the steam supply bypass is opened, and the opening of the intermediate pressure cylinder steam inlet regulating valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value.

[0026] This invention also provides a readable storage medium storing instructions for causing a machine to execute the control method of the power generation and steam supply system described above.

[0027] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the power generation and steam supply system described above.

[0028] This technical solution, while ensuring the stability and economy of steam supply, effectively solves the throttling losses caused by the significant temperature and pressure reduction in traditional heating systems, avoids the problem of reduced heating reliability caused by frequent switching of multiple steam sources, and effectively improves the economy and flexibility of the unit.

[0029] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the power generation and steam supply system provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the control flow of the control method for the power generation and steam supply system provided by the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 1- Thermal power generation system; 2- Common gas transmission pipeline; 3- Pressure reducing steam supply circuit;

[0035] 4-Steam supply bypass; 5-Desuperheating mechanism; 6-Steam supply main pipe;

[0036] 7-Intermediate pressure cylinder inlet steam regulating valve group; 11-Boiler; 12-Steam turbine generator set;

[0037] 13-Condenser; 14-Condensate pump; 15-Low-temperature heater regenerative system;

[0038] 16-Feed water pump; 17-High-pressure heater regeneration system; 21-First isolation valve;

[0039] 22-Check valve; 23-Flow regulating valve; 24-Second isolation valve;

[0040] 101 - Hot resteam pipeline; 121 - High-pressure cylinder; 122 - Medium-pressure cylinder;

[0041] 123 - Low-pressure cylinder. Detailed Implementation

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0043] In the embodiments of the present invention, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use.

[0044] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.

[0046] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0047] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0048] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Figure 1 This is a schematic diagram of the power generation and steam supply system provided by the present invention; Figure 2 This is a schematic diagram of the control flow of the control method for the power generation and steam supply system provided by the present invention.

[0050] This embodiment provides a power generation and steam supply system, such as Figure 1 As shown, the system includes:

[0051] Thermal power generation system 1 is used for power generation and generating hot resteam, and thermal power generation system 1 has hot resteam pipeline 101;

[0052] Common gas transmission pipeline 2, pressure reducing steam supply circuit 3 and steam supply bypass 4, the steam inlet end of common gas transmission pipeline 2 is connected to the hot reheat steam pipeline 101 of thermal power generation system 1, and the steam outlet end is connected to pressure reducing steam supply circuit 3 and steam supply bypass 4 respectively. The hot reheat steam generated by thermal power generation system 1 enters pressure reducing steam supply circuit 3 and steam supply bypass 4 through hot reheat steam pipeline 101 and common gas transmission pipeline 2.

[0053] When the pressure-reducing steam supply circuit 3 is turned on, it reduces the pressure of the hot reheat steam from the thermal power generation system 1 and then delivers it to the desuperheating mechanism 5.

[0054] When the steam supply bypass 4 is turned on, it delivers the hot reheated steam from the thermal power generation system 1 to the desuperheating mechanism 5.

[0055] The cooling mechanism 5 has its outlet end connected to the gas supply main pipe 6, and is used to cool the hot reheat steam before delivering it to the gas supply main pipe 6.

[0056] Specifically, regarding the economic efficiency of unit heating, to ensure reliable steam supply, the extraction steam parameters selected during the design phase are often high. Significant temperature and pressure reduction are required before the steam can be supplied externally, resulting in substantial throttling losses during the pressure reduction process and reducing the unit's heating efficiency. The return water temperature is required to be maintained at a low level, and the temperature of the heating network water after exhaust steam heating is very limited, still showing a significant difference in energy level compared to peak heat source steam. Furthermore, regarding the flexibility and reliability of unit heating, to meet the grid's peak-shaving demands, the units often operate at lower loads, and external steam consumption parameters are highly variable. To ensure steam supply, it is often necessary to switch between multiple steam source points, leading to a decrease in heating stability and safety.

[0057] Therefore, in this embodiment, by setting up the pressure-reducing steam supply circuit 3 and the steam supply bypass 4 in parallel, the steam is supplied from the two pipelines according to the steam pressure value and the pressure demand value, thereby increasing the flexibility, stability and economy of the system.

[0058] Furthermore, the thermal power generation system 1 includes:

[0059] A boiler 11, a steam turbine generator set 12, a condenser 13, a condensate pump 14, a low-pressure heater regenerative system 15, a feedwater pump 16, and a high-pressure heater regenerative system 17 are connected sequentially along the direction of medium flow to form a circulation loop.

[0060] The steam turbine generator set 12 includes: a high-pressure cylinder 121, an intermediate-pressure cylinder 122, and a low-pressure cylinder 123;

[0061] The air inlet of the high-pressure cylinder 121 is connected to the first steam outlet of the boiler 11, the air outlet of the high-pressure cylinder 121 is connected to the second steam inlet of the boiler 11, and the second steam outlet of the boiler 11 is connected to the air inlet of the intermediate-pressure cylinder 122.

[0062] Specifically, after steam performs work in the low-pressure cylinder 123, it is discharged and introduced into the condenser 13. It then enters the low-pressure heater reheat system 15 via the condensate pump 14, and then enters the high-pressure heater reheat system 17 via the feedwater pump 16, before returning to the boiler 11. In the boiler, it is heated to high-temperature steam and then enters the high-pressure cylinder 121 to perform work. After performing work, it is sent back to the reheater of the boiler 11 for further heating. After reheating, it is sent to the intermediate-pressure cylinder 122 via the hot reheat steam pipeline 101 to perform work, and then enters the low-pressure cylinder 123 to perform work again, forming a complete cycle. This method can improve steam utilization and achieve more efficient power generation.

[0063] Furthermore, an intermediate pressure cylinder steam inlet regulating valve group 7 is provided on the hot reheat steam pipeline 101 near the air inlet end of the intermediate pressure cylinder 122. The intermediate pressure cylinder steam inlet regulating valve group 7 is used to regulate the steam pressure entering the common gas transmission pipeline 2.

[0064] Specifically, the intermediate pressure cylinder inlet steam regulating valve group 7 is installed on the reheat steam pipeline 101 near the inlet end of the intermediate pressure cylinder 122, that is, at the rear end of the connection point between the reheat steam pipeline 101 and the common gas transmission pipeline 2. By adjusting the opening of the intermediate pressure cylinder inlet steam regulating valve group 7, the steam flow rate entering the intermediate pressure cylinder 122 can be adjusted, thereby regulating the steam pressure in the pipeline in front of the intermediate pressure cylinder inlet steam regulating valve group 7, and finally regulating the gas pressure entering the common gas transmission pipeline 2.

[0065] Furthermore, the public gas pipeline 2 includes:

[0066] The first isolation valve 21, the check valve 22, the flow regulating valve 23, and the second isolation valve 24 are arranged sequentially along the direction of medium flow.

[0067] Specifically, the first isolation valve 21 and the second isolation valve 24 can control the opening and closing of the pipeline; the check valve 22 can prevent steam backflow in the pipeline and improve safety performance; and the flow regulating valve 23 can regulate the flow rate through the common gas transmission pipeline 2 to achieve precise control.

[0068] Furthermore, the pressure-reducing steam supply circuit 3 includes a pressure-reducing valve assembly.

[0069] Specifically, the pressure-reducing steam supply circuit 3 includes not only pipelines but also a pressure-reducing valve assembly. In this way, the on / off state of the pressure-reducing steam supply circuit 3 is directly controlled through the pressure-reducing valve assembly. The number of pressure-reducing valves in the pressure-reducing steam supply circuit 3 can be set according to the designed flow rate. For larger flow rates, multiple pressure-reducing valves can be installed. The pressure-reducing valve assembly can be configured as a first-temperature pressure-reducing valve assembly and a second-temperature pressure-reducing valve assembly arranged in parallel. Under normal circumstances, only one of the first-temperature or second-temperature pressure-reducing valve assembly operates. When one needs maintenance or is damaged, it is replaced by the other, improving the system's redundancy and stability.

[0070] In another embodiment, in addition to the pressure reducing valve assembly installed on the pipeline, the pressure reducing steam supply circuit 3 also includes on / off control isolation valves installed at both ends of the pressure reducing valve assembly, which are used to control the on / off of the pressure reducing steam supply circuit 3, facilitate the maintenance of the pressure reducing valve assembly, and further improve safety.

[0071] Furthermore, the steam supply bypass 4 includes a third isolation valve.

[0072] Specifically, in addition to the pipeline, the steam supply bypass 4 also includes a third isolation valve, which enables the on / off control of the steam supply bypass 4.

[0073] Furthermore, the cooling mechanism 5 includes a cooler.

[0074] Specifically, the desuperheater is connected to desuperheating water, which is used to control the temperature of the steam.

[0075] This invention presents a steam supply system and method that balances heating reliability and economy. To meet the variable flow steam supply needs for various applications such as industrial and heating, it incorporates bypass steam supply technology based on desuperheating and pressure-reducing valve groups. This enhances the stability and reliability of the steam supply system under the dual scheduling environment of complex and ever-changing power grid and heat user demands. Furthermore, it proposes a method for switching steam supply modes under different load rates, taking into account overall economic efficiency. Under low-load conditions, only the bypass steam supply system needs to be used for external heating, eliminating the need to switch the heating steam source. This avoids the energy losses and frequent steam source switching problems caused by directly using high-quality steam with significant desuperheating and pressure reduction, thus improving the heating economy and reliability.

[0076] The aforementioned steam supply system is suitable for industrial and heating steam use. Furthermore, this system can be used not only in hot reheat extraction systems but also in other extraction pipelines such as main steam pipeline extraction for heating and medium / low-pressure cylinder connecting pipe extraction for heating. Additionally, this steam supply system can also be used with gas turbine generator sets.

[0077] This invention also provides a control method for a power generation and steam supply system, applicable to the aforementioned power generation and steam supply system, such as... Figure 2 As shown, the method includes:

[0078] Obtain the steam pressure value in the hot resteam pipeline and the pressure demand value of the steam supply header;

[0079] If the steam pressure value is greater than the pressure requirement value, the pressure reducing steam supply circuit is turned on and the steam supply bypass is turned off. The opening of the pressure reducing valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value.

[0080] If the steam pressure value is equal to the pressure demand value, then the pressure-reducing steam supply circuit is disconnected and the steam supply bypass is opened.

[0081] If the steam pressure value is less than the pressure requirement value, the pressure reducing steam supply circuit is disconnected, the steam supply bypass is opened, and the opening of the intermediate pressure cylinder steam inlet regulating valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value.

[0082] Specifically, including:

[0083] 1. If the load rate of the coal-fired power generation unit is high, the main steam flow and pressure of the unit are large. In this case, the steam flow and pressure at the outlet of the boiler reheater in the coal-fired power generation unit are large. In order to ensure the required pressure for steam supply, the third isolation valve of the steam supply bypass is closed. The hot reheat steam enters the pressure reducing steam supply circuit, and the pressure reducing valve group of the pressure reducer completes the pressure reduction work. Then, it enters the nozzle of the desuperheater to complete the desuperheating work. The steam after desuperheating and pressure reduction enters the steam supply header for external heating.

[0084] 2. To meet peak demand, coal-fired power generating units need to operate at low loads. Under this condition, the main steam flow and pressure of the unit are low, and the steam flow and pressure at the boiler reheater outlet of the coal-fired power generating unit also decrease accordingly. If the reheat extraction steam pressure is still higher than the pressure requirement of the steam supply header at this time, the desuperheating and pressure reduction process in step 1 is repeated.

[0085] If the reheat steam extraction pressure is lower than the required steam supply pressure, the reheat steam pressure is adjusted by the intermediate pressure cylinder inlet steam regulating valve group to ensure the steam supply pressure. Since the reheat steam extraction pressure before the intermediate pressure cylinder inlet steam regulating valve group is close to the steam supply pressure, the extracted steam does not need to be depressurized by the pressure reducer. At this time, the steam supply bypass is opened, and the extracted steam enters the desuperheater nozzle directly through the steam supply bypass to complete the desuperheating work before entering the steam supply header.

[0086] Specifically, the opening of the intermediate-pressure cylinder steam inlet regulating valve group is controlled based on the difference between the steam pressure value and the pressure demand value, so that the steam pressure value meets the pressure demand value. This includes calculating the regulating opening using the following formula:

[0087]

[0088] Where δ is the opening degree of the intermediate pressure cylinder steam inlet regulating valve group at the next moment; δ 当前 η is the opening degree of the intermediate pressure cylinder inlet steam regulating valve group at the current moment; a is a constant; P0 is the pressure demand value of the steam supply header; P is the steam pressure value in the hot reheat steam pipeline at the current moment; η is the fitting coefficient.

[0089] In this embodiment, if the difference between the steam pressure value and the pressure requirement value is larger at the current moment, the difference between the calculated opening of the intermediate pressure cylinder steam inlet regulating valve group at the next moment and the opening of the intermediate pressure cylinder steam inlet regulating valve group at the current moment will be larger, so that the steam pressure value meets the pressure requirement value; if the difference between the steam pressure value and the pressure requirement value is smaller at the current moment, the difference between the calculated opening of the intermediate pressure cylinder steam inlet regulating valve group at the next moment and the opening of the intermediate pressure cylinder steam inlet regulating valve group at the current moment will be smaller, so that the steam pressure value meets the pressure requirement value.

[0090] Using the above calculation formula can ensure more accurate control of the opening of the intermediate pressure cylinder steam inlet regulating valve group, and further ensure the stability of the steam supply pressure.

[0091] More specifically, in this embodiment, the present invention assumes that the extraction steam quantity Dc has two specific values, Dc1 and Dc2, and Dc2 = max{Dc1, Dc2}, and the specific values ​​satisfy:

[0092] 1) When Dc > Dc1, neither the high-pressure steam supply circuit nor the steam supply bypass can meet the steam supply demand. In order to meet the steam supply demand, the intermediate-pressure cylinder inlet steam regulating valve group (hereinafter referred to as the intermediate valve) needs to be regulated.

[0093] 2) When Dc>Dc2, neither the pressure steam supply circuit nor the steam supply bypass can meet the steam supply demand.

[0094] The electrical load P of the unit has a specific value N, and the specific value N satisfies: when P is gradually reduced from 100% to N, the unit no longer has the extraction capacity;

[0095] When the unit extraction amount satisfies Dc<Dc1:

[0096] ① When P≤N, the valves of the intermediate pressure cylinder inlet regulating valve group adopt the single-valve operation mode, which are opened and closed synchronously, and only have two states of full opening and full closing. The reheat extraction pressure is not regulated, and the unit operates in pure condensation mode.

[0097] ② When 100%≥P>N, the extraction pressure of the hot reheat extraction pipeline is higher than the steam supply pressure, the pressure-reducing steam supply circuit is put into operation, the control of the intermediate control valve is unlocked, and the extraction enters manual control. The first isolation valve, the check valve, the flow regulating valve and the second isolation valve are opened, the third isolation valve of the steam supply bypass is closed, the pressure reducing valve group is opened, the pressure-reducing steam supply circuit is in working state, and the extracted steam is subjected to pressure reduction and temperature reduction to reach the parameters required by the user before being supplied externally.

[0098] When the unit extraction amount satisfies Dc1≤Dc<Dc2:

[0099] ① When P≤N, the valves of the intermediate pressure cylinder inlet regulating valve group adopt the single-valve operation mode, which are opened and closed synchronously, and only have two states of full opening and full closing. The reheat extraction pressure is not regulated, and the unit operates in pure condensation mode.

[0100] ② When 100%≥P>N, as the extraction amount further increases, the extraction pressure of the hot reheat extraction pipeline decreases to be lower than the steam supply pressure, the steam supply bypass is put into operation, the intermediate control valve enters automatic extraction control, the first isolation valve, the check valve, the flow regulating valve and the third isolation valve are opened, the pressure reducing valve group of the pressure-reducing steam supply circuit is closed, the pressure-reducing steam supply circuit is in working state, and the extracted steam is subjected to temperature reduction to reach the parameters required by the user before being supplied externally.

[0101] The steam supply system and method of the present invention that兼顾 both heating reliability and economy, in order to meet the variable flow steam supply demands for multiple purposes such as industrial use and heating, adds a bypass steam supply technology on the basis of the steam supply technology based on the temperature and pressure reducing valve group. Under the dual scheduling environment of complex and changeable power grid and heat user demands, the stability and reliability of the steam supply system are improved, and a steam supply mode switching method under different load rates is proposed at the same time, which兼顾 the overall economy. Under low load working conditions, it is only necessary to use the bypass steam supply system for external heating, and there is no need to switch the heating steam source point, which avoids the problems of energy loss caused by direct heating with high-quality parameter steam through large-scale temperature and pressure reduction and frequent switching of steam sources, and improves the economy and reliability of heating.

[0102] The aforementioned steam supply system is suitable for industrial and heating steam use. Furthermore, this system can be used not only in hot reheat extraction systems but also in other extraction pipelines such as main steam pipeline extraction for heating and medium / low-pressure cylinder connecting pipe extraction for heating. Additionally, this steam supply system can also be used with gas turbine generator sets.

[0103] The present invention also provides a readable storage medium storing instructions for causing a machine to execute the control method of the power generation and steam supply system described above.

[0104] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described control method for a power generation and steam supply system.

[0105] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0106] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0107] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0108] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A control method for a power generation and steam supply system, characterized in that, The system includes: A thermal power generation system (1) is used to generate electricity and produce heat resteam. The thermal power generation system (1) has a heat resteam pipeline (101). The common gas transmission pipeline (2), the pressure reducing steam supply circuit (3) and the steam supply bypass (4) are connected. The steam inlet of the common gas transmission pipeline (2) is connected to the hot reheat steam pipeline (101) of the thermal power generation system (1), and the steam outlet is connected to the pressure reducing steam supply circuit (3) and the steam supply bypass (4) respectively. The hot reheat steam generated by the thermal power generation system (1) enters the pressure reducing steam supply circuit (3) and the steam supply bypass (4) through the hot reheat steam pipeline (101) and the common gas transmission pipeline (2). When the pressure-reducing steam supply circuit (3) is turned on, it reduces the pressure of the hot reheat steam from the thermal power generation system (1) and delivers it to the de-heating mechanism (5). When the steam supply bypass (4) is turned on, it delivers the hot reheat steam from the thermal power generation system (1) to the desuperheating mechanism (5). The cooling mechanism (5) is connected to the gas supply main pipe (6) at its outlet end, and is used to cool the hot reheat steam and then deliver it to the gas supply main pipe (6). The method includes: Obtain the steam pressure value in the hot resteam pipeline and the pressure demand value of the steam supply header; If the steam pressure value is greater than the pressure requirement value, the pressure reducing steam supply circuit is turned on and the steam supply bypass is turned off. The opening of the pressure reducing valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value. If the steam pressure value is equal to the pressure demand value, then the pressure reducing steam supply circuit is disconnected and the steam supply bypass is opened. If the steam pressure value is less than the pressure requirement value, the pressure-reducing steam supply circuit is disconnected, the steam supply bypass is opened, and the opening of the intermediate pressure cylinder steam inlet regulating valve group is controlled based on the difference between the steam pressure value and the pressure requirement value, so that the steam pressure value meets the pressure requirement value, including calculation using the following formula: in, The opening degree of the intermediate pressure cylinder steam inlet regulating valve group at the next moment; The opening degree of the intermediate pressure cylinder steam inlet regulating valve group at the current moment; It is a constant; This refers to the pressure requirement value of the steam supply header; This represents the current steam pressure value inside the hot resteam pipeline. The coefficients are the fitting coefficients.

2. The control method for the power generation and steam supply system according to claim 1, characterized in that, The thermal power generation system (1) includes: A boiler (11), a steam turbine generator set (12), a condenser (13), a condensate pump (14), a low-pressure heater regeneration system (15), a feedwater pump (16), and a high-pressure heater regeneration system (17) are connected in sequence along the direction of medium flow to form a circulation loop. The steam turbine generator set (12) includes: a high-pressure cylinder (121), an intermediate-pressure cylinder (122), and a low-pressure cylinder (123). The inlet end of the high-pressure cylinder (121) is connected to the first steam outlet end of the boiler (11), the outlet end of the high-pressure cylinder (121) is connected to the second steam inlet end of the boiler (11), and the second steam outlet end of the boiler (11) is connected to the inlet end of the medium-pressure cylinder (122).

3. The control method for the power generation and steam supply system according to claim 2, characterized in that, A medium-pressure cylinder steam inlet regulating valve group (7) is provided on the hot reheat steam pipeline (101) near the air inlet end of the medium-pressure cylinder (122). The medium-pressure cylinder steam inlet regulating valve group (7) is used to regulate the steam pressure entering the common gas transmission pipeline (2).

4. The control method for the power generation and steam supply system according to claim 1, characterized in that, The public gas pipeline (2) includes: The first isolation valve (21), check valve (22), flow regulating valve (23), and second isolation valve (24) are arranged sequentially along the direction of medium flow.

5. The control method for the power generation and steam supply system according to claim 1, characterized in that, The pressure-reducing steam supply circuit (3) includes a pressure-reducing valve assembly.

6. The control method for the power generation and steam supply system according to claim 1, characterized in that, The steam supply bypass (4) includes a third isolation valve.

7. The control method for the power generation and steam supply system according to claim 1, characterized in that, The cooling mechanism (5) includes a cooler.

8. A readable storage medium storing instructions, characterized in that, This instruction is used to cause the machine to perform the control method of the power generation and steam supply system as described in any one of claims 1-7.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method of the power generation and steam supply system according to any one of claims 1-7.

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