A feed water pump turbine steam supply system, a control method thereof and related equipment

Abstract

The present disclosure provides a feed water pump turbine steam supply system, a control method thereof and related equipment, wherein the steam supply system comprises: a pressure matcher, a steam output end of the pressure matcher being connected to a steam inlet end of a feed water pump turbine; a first pipeline, one end of the first pipeline being connected to a high-pressure steam input end of the pressure matcher, and the other end being used for connecting to a reheated cold section steam; a second pipeline, one end of the second pipeline being connected to a low-pressure steam input end of the pressure matcher, and the other end being used for connecting to a fourth-stage steam extraction; and an adjusting valve, which is arranged in the pressure matcher and is used for adjusting an input flow of the high-pressure steam input end.

Description

Technical Field

[0001] This disclosure relates to the field of thermal power generation technology, and in particular to a steam supply system for a feedwater pump turbine, its control method, and related equipment. Background Technology

[0002] In related technologies, generator sets are typically equipped with steam-driven feedwater pumps, and the steam source for the feedwater pump turbine usually includes the fourth-stage extraction steam from the main turbine of the unit. However, in practical applications, the fourth-stage extraction steam not only supplies the feedwater pump turbine but also sometimes needs to supply steam to other steam-consuming equipment or scenarios. As a result, during the production process, insufficient steam pressure at the feedwater pump turbine often occurs, leading to limited output of the feedwater pump turbine. Summary of the Invention

[0003] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, a feedwater pump turbine steam supply system is provided according to a first aspect of the present disclosure, comprising: Pressure matching device, the steam output end of the pressure matching device is used to connect to the steam inlet end of the feedwater pump turbine; The first pipeline has one end connected to the high-pressure steam input terminal of the pressure matching device, and the other end is used to connect to the reheat cold section steam. The second pipeline has one end connected to the low-pressure steam input terminal of the pressure matching device, and the other end used to connect to the fourth stage steam extraction. A regulating valve, located on the pressure matching device, is used to regulate the input flow rate at the high-pressure steam input end.

[0005] In one feasible implementation, the feedwater pump turbine steam supply system further includes: The first isolation valve is installed in the first pipeline and is used to control the opening or closing of the first pipeline.

[0006] In one feasible implementation, there are multiple low-pressure steam inlet terminals; the second pipeline includes: The low-pressure steam main pipe has one end connected to the fourth stage extraction steam. Low-pressure steam branch pipes are connected between the low-pressure steam main pipe and the low-pressure steam inlet. There are multiple low-pressure steam branch pipes, and each low-pressure steam branch pipe is arranged in a one-to-one correspondence with the low-pressure steam inlet.

[0007] In one feasible implementation, the feedwater pump turbine steam supply system further includes: The second isolation valve is installed on the low-pressure steam main pipe and is used to control the opening or closing of the low-pressure steam main pipe. The third isolation valve is installed on the low-pressure steam branch pipe and is used to control the opening or closing of the low-pressure steam branch pipe.

[0008] In one feasible implementation, the feedwater pump turbine steam supply system further includes: The third pipeline has one end connected to the steam output end and the other end connected to the steam inlet end of the feedwater pump turbine.

[0009] In one feasible implementation, the feedwater pump turbine steam supply system further includes: The first detection element, installed on the pressure matcher, is used to detect the steam pressure information at the steam output end; and / or The second detection element is installed in the third pipe to detect the steam pressure information in the third pipe.

[0010] According to a second aspect of the present disclosure, a control method for a feedwater pump turbine steam supply system is provided for a feedwater pump turbine steam supply system as described in any of the first aspects above, the aforementioned control method comprising: Obtain the actual steam pressure output from the steam output terminal; Adjust the input flow rate at the high-pressure steam input end based on the actual steam pressure and the target inlet steam pressure of the feedwater pump turbine.

[0011] In one feasible implementation, the aforementioned step of controlling the operation of the regulating valve based on the actual steam pressure and the target inlet steam pressure of the feedwater pump turbine includes: When the actual steam pressure is greater than the target inlet steam pressure, reduce the opening of the regulating valve to reduce the input flow rate at the high-pressure steam inlet. When the actual steam pressure is less than the target inlet steam pressure, increase the opening of the regulating valve to increase the input flow rate at the high-pressure steam inlet. When the actual steam pressure equals the target inlet steam pressure, the control valve maintains its current opening.

[0012] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, which stores a computer program that, when executed, implements the control method as described in any of the second aspects above.

[0013] A control device is provided according to a fourth aspect of the embodiments of this disclosure, comprising: Memory, which stores computer programs; A processor is used to execute computer programs; In this process, when the processor executes the computer program, it implements the control method proposed in any of the second aspects above.

[0014] The above description is merely an overview of the technical solution provided in this disclosure. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other features and effects of this disclosure more obvious and easy to understand, the following are specific examples of the implementation methods of this disclosure. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic structural diagram of a feedwater pump turbine steam supply system according to one embodiment of the present disclosure; Figure 2 A schematic flowchart illustrating a control method for a feedwater pump turbine steam supply system according to an embodiment of this disclosure; Figure 3 A schematic structural block diagram of a computer-readable storage medium according to an embodiment of this disclosure; Figure 4 This is a schematic structural block diagram of a control device according to an embodiment of the present disclosure.

[0016] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100, Pressure matching device; 200, First pipeline; 300, Second pipeline; 310, Low-pressure steam main pipe; 320, Low-pressure steam branch pipe; 400, Control valve; 500, First isolation valve; 600a, Second isolation valve; 600b, Third isolation valve; 700, Reheat cold section steam header; 800, Fourth section extraction steam header; 900, Feedwater pump turbine. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0018] It should be noted that in related technologies, generator sets are typically equipped with steam-driven feedwater pumps, and the steam source for the feedwater pump turbine usually includes the fourth-stage extraction steam from the main turbine of the unit. However, in practical applications, the fourth-stage extraction steam not only supplies the feedwater pump turbine but also sometimes needs to supply steam to other steam-consuming equipment or scenarios. As a result, during the production process, insufficient steam pressure at the feedwater pump turbine often occurs, leading to limited output of the feedwater pump turbine.

[0019] In view of this, such as Figure 1 As shown, a feedwater pump turbine steam supply system is provided according to a first aspect of the present disclosure, comprising: a pressure matching device 100, the steam output end of which is connected to the steam inlet end of a feedwater pump turbine 900; a first pipe 200, one end of which is connected to the high-pressure steam input end of the pressure matching device 100, and the other end of which is used to connect to reheat cold section steam; a second pipe 300, one end of which is connected to the low-pressure steam input end of the pressure matching device 100, and the other end of which is used to connect to four-stage extraction steam; and a regulating valve 400, disposed on the pressure matching device 100, for regulating the input flow rate at the high-pressure steam input end.

[0020] The feedwater pump turbine steam supply system disclosed herein includes the aforementioned pressure matching device 100, a first pipeline 200, a second pipeline 300, and a regulating valve 400. The pressure matching device 100 has a steam output end, a high-pressure steam input end, and a low-pressure steam input end. One end of the first pipeline 200 and one end of the second pipeline 300 are respectively connected to the aforementioned high-pressure steam input end and low-pressure steam input end. In practical applications, the first pipeline 200 and the second pipeline 300 can be respectively connected to the reheat cold section steam and the fourth-stage extraction steam of the generator set, and the connected reheat cold section steam and fourth-stage extraction steam are respectively delivered to the aforementioned high-pressure steam input end and low-pressure steam input end. The regulating valve 400 is installed on the pressure matching device 100 and is used for… By adjusting the input flow rate at the high-pressure steam input terminal, when the aforementioned regulating valve 400 adjusts the input flow rate at the high-pressure steam input terminal to 0, the pressure matching device 100 can supply the fourth-stage extraction steam to the feedwater pump turbine 900. Correspondingly, when the aforementioned regulating valve 400 adjusts the input flow rate at the high-pressure steam input terminal to a value greater than 0, the pressure matching device 100 can simultaneously connect reheat cold section steam and fourth-stage extraction steam, and use the relatively high-pressure reheat cold section steam to induce the fourth-stage extraction steam, thereby increasing the actual steam pressure output at the steam output terminal. Based on this, when the pressure level of the fourth-stage extraction steam is low, the regulating valve 400 can be set to a relatively large opening to increase the actual steam pressure output at the steam output end. This ensures the inlet steam pressure and output level of the feedwater pump turbine 900 and enables the matching and utilization of two different parameters of steam: reheat cold section steam and fourth-stage extraction steam. When the pressure level of the fourth-stage extraction steam is high, the regulating valve 400 can be set to a relatively small opening or completely closed. This avoids excessive inlet steam pressure of the feedwater pump turbine 900 while reducing reheat cold section steam consumption during the steam supply process, which is beneficial for the generator set to allocate steam resources.

[0021] In summary, the steam supply system for the feedwater pump turbine provided in this embodiment can transfer the capacity of the reheat cold section steam to the fourth stage extraction steam through the pressure matching device 100. It can achieve the matching and utilization of two steams with different parameters, so that when the pressure of the fourth stage extraction steam is insufficient, the reheat cold section steam can be used to induced the fourth stage extraction steam, ensuring the reliability of the steam source for the feedwater pump turbine 900. This provides a guarantee for the stable and reliable output of the feedwater pump turbine 900 under different operating conditions of the generator set. Moreover, the aforementioned steam supply system has a simple structure and is easy to implement by modifying the original generator set, which helps to reduce the implementation cost of the aforementioned steam supply system.

[0022] It is understood that the aforementioned reheat cold section steam refers to the steam between the exhaust port of the high-pressure cylinder of the main turbine of the generator set and the inlet of the boiler reheater; the aforementioned four-stage extraction steam refers to the extraction steam from the intermediate-pressure cylinder of the main turbine. In practical applications, the aforementioned four-stage extraction steam is used to drive the feedwater pump turbine 900, deaerator heating, industrial steam supply, heating steam extraction, etc.; the pressure of the aforementioned reheat cold section steam is usually higher than the pressure of the aforementioned four-stage extraction steam.

[0023] For example, such as Figure 1 As shown, one end of the aforementioned first pipe 200 can be connected to the reheat cold section steam header 700 of the generator set to access the reheat cold section steam in the reheat cold section steam header 700; one end of the aforementioned second pipe 300 can be connected to the four-section extraction steam header 800 of the generator set to access the four-section extraction steam in the four-section extraction steam header 800.

[0024] It is understandable that by adjusting the input flow rate at the high-pressure steam input terminal, the proportion of reheat cold section steam connected to the pressure matcher 100 in the total steam inlet of the pressure matcher 100 can be changed, and the aforementioned proportion is positively correlated with the aforementioned input flow rate. The actual steam pressure output by the pressure matcher 100 is also positively correlated with the aforementioned proportion.

[0025] Understandably, in practical applications, the feedwater pump turbine steam supply system can be configured to adjust the input flow rate at the high-pressure steam input terminal based on the actual steam pressure output from the steam output terminal and the target inlet steam pressure of the feedwater pump turbine 900. The aforementioned target inlet steam pressure is the steam input pressure required for the operation of the feedwater pump turbine 900. In practical applications, the target inlet steam pressure can be a pressure range or a fixed pressure value; the specific target inlet steam pressure can be set according to actual needs, without further limitations here. Based on this, the steam pressure output from the aforementioned steam supply system to the feedwater pump turbine 900 can match the needs of the feedwater pump turbine 900, thereby further ensuring the inlet steam pressure and output level of the feedwater pump turbine 900, and improving the control convenience and automation level of the aforementioned steam supply system.

[0026] It is understandable that the input flow rate at the aforementioned high-pressure steam input end can be adjusted by controlling the opening of the aforementioned regulating valve 400. For example, if it is necessary to reduce the aforementioned input flow rate, the opening of the regulating valve 400 can be reduced; if it is necessary to increase the aforementioned input flow rate, the opening of the regulating valve 400 can be increased; and if it is necessary to maintain the aforementioned input flow rate at the current level, the regulating valve 400 can be kept at the current opening.

[0027] In some feasible examples, the feedwater pump turbine steam supply system may further include: a pressure transmitter for acquiring the actual steam pressure output from the steam output end; an electric actuator connected to the regulating valve 400 and used to drive the valve core of the regulating valve 400 to adjust the opening of the regulating valve 400; and a control component, signal-connected to the pressure transmitter and the electric actuator, the control component being preset with the aforementioned target inlet steam pressure and configured to control the operation of the electric actuator according to the aforementioned actual steam pressure and target inlet steam pressure; specifically, the control component is used to control the electric actuator to reduce the opening of the regulating valve 400 when the actual steam pressure is greater than the target inlet steam pressure, so as to reduce the input flow at the high-pressure steam input end; to control the electric actuator to increase the opening of the regulating valve 400 when the actual steam pressure is less than the target inlet steam pressure, so as to increase the input flow at the high-pressure steam input end; and to control the electric actuator to stop driving the valve core of the regulating valve 400 when the actual steam pressure is equal to the target inlet steam pressure, so that the regulating valve 400 maintains its current opening.

[0028] For example, the aforementioned control components may include a DCS (Distributed Control System). The pressure transmitter can output the acquired actual steam pressure to the DCS. The electric actuator may be, but is not limited to, an electric linear actuator, and can respond to control commands given by the DCS and feed back the valve position information of the regulating valve 400 to the DCS. The aforementioned actual steam pressure, control commands, and valve position information can all be transmitted in the form of 4mA~20mA signals. The aforementioned electric linear actuator may have at least one of the following protection functions: over-torque, over-current, power failure, and signal failure.

[0029] like Figure 1 As shown, in one feasible embodiment, the feedwater pump turbine steam supply system further includes: a first isolation valve 500, which is installed in the first pipeline 200 and is used to control the opening or closing of the first pipeline 200.

[0030] In this technical solution, the steam supply system for the feedwater pump turbine may further include the aforementioned first isolation valve 500. Based on the aforementioned configuration, the steam supply system can utilize the first isolation valve 500 to control the on / off state of the first pipeline 200, thereby improving the maintainability of the steam supply system and facilitating the safe and reliable disconnection of reheat cold section steam in practical applications to carry out maintenance and repair of upstream pipelines or equipment of the first pipeline 200.

[0031] like Figure 1As shown, in one feasible embodiment, there are multiple low-pressure steam inlet terminals; the second pipeline 300 includes: a low-pressure steam main pipe 310, one end of which is used to connect to the fourth stage of steam extraction; and a low-pressure steam branch pipe 320, which is connected between the low-pressure steam main pipe 310 and the low-pressure steam inlet terminals. There are multiple low-pressure steam branch pipes 320, and each low-pressure steam branch pipe 320 is arranged in a one-to-one correspondence with a low-pressure steam inlet terminal.

[0032] In this technical solution, there are multiple low-pressure steam input terminals. The second pipeline 300 may include the aforementioned low-pressure steam main pipe 310 and multiple aforementioned low-pressure steam branch pipes 320, with each low-pressure steam branch pipe 320 arranged in a one-to-one correspondence with a low-pressure steam input terminal. Based on this, the aforementioned steam supply system can distribute the incoming four-stage extraction steam through multiple low-pressure steam branch pipes 320 and low-pressure steam input terminals to the pressure matching device 100. This enhances the extraction effect and improves the stability of the steam pressure output at the steam output terminal during the process of using reheat cold section steam to entice the four-stage extraction steam, and also enhances the configuration flexibility and reliability of the low-pressure steam side of the pressure matching device 100.

[0033] It is understandable that the other end of the low-pressure steam main pipe 310 can be a closed end, and multiple low-pressure steam branch pipes 320 can be connected to the periphery of the low-pressure steam main pipe 310 and communicate with the interior of the low-pressure steam main pipe 310.

[0034] like Figure 1 As shown, in one feasible embodiment, the feedwater pump turbine steam supply system further includes: a second isolation valve 600a, disposed on the low-pressure steam main pipe 310, for controlling the opening or closing of the low-pressure steam main pipe 310; and a third isolation valve 600b, disposed on the low-pressure steam branch pipe 320, for controlling the opening or closing of the low-pressure steam branch pipe 320.

[0035] In this technical solution, the steam supply system for the feedwater pump turbine may also include the aforementioned second isolation valve 600a and third isolation valve 600b. Based on the aforementioned configuration, the steam supply system can control the on / off states of the low-pressure steam main pipe 310 and the low-pressure steam branch pipe 320 using the second isolation valve 600a and the third isolation valve 600b, respectively. Correspondingly, when the low-pressure steam main pipe 310 is shut off, the pressure matching device 100 can be disconnected from the fourth-stage extraction steam supply to facilitate the maintenance of the upstream pipelines or equipment of the low-pressure steam main pipe 310. When multiple low-pressure steam branch pipes 320 are shut off, the pressure matching device 100 can also be disconnected from the fourth-stage extraction steam supply to facilitate the maintenance of the low-pressure steam main pipe 310 and its upstream pipelines or equipment. The aforementioned steam supply system can also adjust the flow rate of the fourth-stage extraction steam supplied by the pressure matching device 100 by adjusting the number of low-pressure steam branch pipes 320 in the conducting state, thereby improving the adjustment of the low-pressure steam input of the pressure matching device 100 and further enhancing the flexibility of the aforementioned steam supply system and the controllability of the output steam parameters.

[0036] It is understandable that there are multiple third isolation valves 600b, with one third isolation valve 600b installed on each low-pressure steam branch pipe 320.

[0037] like Figure 1 As shown, in one feasible embodiment, the feedwater pump turbine steam supply system further includes a third pipeline, one end of which is connected to the steam output end, and the other end of which is used to connect to the steam inlet end of the feedwater pump turbine 900.

[0038] In this technical solution, the steam supply system for the feedwater pump turbine may further include the aforementioned third pipeline. Based on the aforementioned configuration, the steam output end of the pressure matching device 100 can be connected to the steam inlet end of the feedwater pump turbine 900 through the third pipeline, and steam can be supplied to the feedwater pump turbine 900 through the third pipeline, thus ensuring a stable and reliable connection of the feedwater pump turbine 900 to steam.

[0039] In one feasible implementation, the feedwater pump turbine steam supply system further includes: a first detection element disposed on the pressure matching device 100 for detecting steam pressure information at the steam output end; and / or a second detection element disposed on the third pipeline for detecting steam pressure information within the third pipeline.

[0040] In this technical solution, the feedwater pump turbine steam supply system may further include at least one of the aforementioned first and second detection components. Based on the aforementioned configuration, the feedwater pump turbine steam supply system can determine the pressure status output from the pressure matching device 100 to the feedwater pump turbine 900 by using the steam pressure information at the steam output end and / or the steam pressure information in the third pipeline, thereby providing reference information for the regulation of the regulating valve 400 and helping to ensure the stable operation of the feedwater pump turbine 900.

[0041] Understandably, when the feedwater pump turbine steam supply system includes the first and second detection devices, the number of steam pressure detection points can be expanded to facilitate the comprehensive analysis of steam pressure information at the steam output end and steam pressure information in the third pipeline, so as to more accurately determine the pressure status output from the pressure matching device 100 to the feedwater pump turbine 900.

[0042] like Figure 2 As shown, a control method for a feedwater pump turbine steam supply system is provided according to a second aspect of the present disclosure, for use in the feedwater pump turbine steam supply system as described in any of the first aspects above, the aforementioned control method comprising: Step S101: Obtain the actual steam pressure output from the steam output terminal.

[0043] Specifically, by obtaining the actual steam pressure output from the steam output terminal, the pressure condition output from the pressure matching device 100 to the feedwater pump turbine 900 can be determined, so as to determine whether the pressure output from the pressure matching device 100 to the feedwater pump turbine 900 is suitable for the operation requirements of the feedwater pump turbine 900, thereby providing a reference for the regulation of the feedwater pump turbine steam supply system.

[0044] It is understandable that there can be multiple methods to obtain the aforementioned actual steam pressure. For example, a pressure sensor or pressure transmitter can be installed at the aforementioned steam output end to collect the aforementioned actual steam pressure. The specific method for obtaining the aforementioned actual steam pressure can be set according to actual needs, and no further limitations are imposed here.

[0045] Step S102: Adjust the input flow rate at the high-pressure steam input end according to the actual steam pressure and the target steam inlet pressure of the feedwater pump turbine 900.

[0046] Specifically, once the actual steam pressure is obtained, the input flow rate at the high-pressure steam input end can be adjusted according to the actual steam pressure and the target steam inlet pressure of the feedwater pump turbine 900, so that the actual steam pressure matches the target steam inlet pressure, thereby ensuring the reliability of the steam source for the feedwater pump turbine 900 and providing a guarantee for the stable and reliable power output of the feedwater pump turbine 900 under different operating conditions of the generator set.

[0047] It is understandable that the aforementioned target steam inlet pressure is the steam input pressure required for the operation of the feedwater pump turbine 900. In practical applications, the target steam inlet pressure can be a pressure range or a fixed pressure value. The specific target steam inlet pressure can be set according to actual needs, and no further restrictions are imposed here.

[0048] It is understandable that the input flow rate at the aforementioned high-pressure steam input end can be adjusted by controlling the opening of the aforementioned regulating valve 400. For example, if it is necessary to reduce the aforementioned input flow rate, the opening of the regulating valve 400 can be reduced; if it is necessary to increase the aforementioned input flow rate, the opening of the regulating valve 400 can be increased; and if it is necessary to maintain the aforementioned input flow rate at the current level, the regulating valve 400 can be kept at the current opening.

[0049] It is understandable that by adjusting the input flow rate at the high-pressure steam input terminal, the proportion of reheat cold section steam connected to the pressure matcher 100 in the total steam inlet of the pressure matcher 100 can be changed, and the aforementioned proportion is positively correlated with the aforementioned input flow rate. The actual steam pressure output by the pressure matcher 100 is also positively correlated with the aforementioned proportion.

[0050] In summary, the control method for the feedwater pump turbine steam supply system provided in this embodiment can control the feedwater pump turbine steam supply system proposed in any of the first aspects above. Based on the actual steam pressure and the target inlet steam pressure of the feedwater pump turbine 900, the input flow rate at the high-pressure steam input terminal is adjusted to match the actual steam pressure with the target inlet steam pressure, thereby ensuring the reliability of the steam source for the feedwater pump turbine 900. This provides a guarantee for the stable and reliable output of the feedwater pump turbine 900 under different operating conditions of the generator set, and can improve the automation level and ease of use of the aforementioned steam supply system.

[0051] In one feasible implementation, the aforementioned step of controlling the operation of the regulating valve 400 based on the actual steam pressure and the target inlet steam pressure of the feedwater pump turbine 900 includes: When the actual steam pressure is greater than the target steam inlet pressure, reduce the opening of the regulating valve 400 to reduce the input flow rate at the high-pressure steam inlet. When the actual steam pressure is less than the target inlet steam pressure, increase the opening of the regulating valve 400 to increase the input flow rate at the high-pressure steam inlet. When the actual steam pressure equals the target inlet steam pressure, control valve 400 maintains its current opening.

[0052] Specifically, during the operation of the regulating valve 400, based on the actual steam pressure and the target inlet steam pressure of the feedwater pump turbine 900, the relationship between the actual steam pressure and the target inlet steam pressure can be compared first. Accordingly, when the actual steam pressure is high, the opening of the regulating valve 400 can be reduced to decrease the input flow rate at the high-pressure steam input end, thereby reducing the proportion of reheat cold section steam connected to the pressure matching device 100 in the total inlet steam of the pressure matching device 100, thus lowering the aforementioned actual steam pressure. When the actual steam pressure is low, the opening of the regulating valve 400 can be increased. This increases the input flow rate at the high-pressure steam input end, thereby increasing the proportion of reheat cold section steam connected to the pressure matching device 100 in the total steam inlet of the pressure matching device 100. This raises the actual steam pressure. When the actual steam pressure matches the target steam inlet pressure, the current opening of the regulating valve 400 can be maintained to keep the current actual steam pressure. Based on this, the actual steam pressure can be matched with the target steam inlet pressure, ensuring the reliability of the steam source for the feedwater pump turbine 900 and providing a guarantee for the stable and reliable output of the feedwater pump turbine 900 under different operating conditions of the generator set.

[0053] It is understandable that, when the target steam inlet pressure is a pressure range, the aforementioned actual steam pressure greater than the target steam inlet pressure refers to the upper limit of the range where the actual steam pressure is greater than the target steam inlet pressure, the aforementioned actual steam pressure less than the target steam inlet pressure refers to the lower limit of the range where the actual steam pressure is less than the target steam inlet pressure, and the aforementioned actual steam pressure equal to the target steam inlet pressure refers to the actual steam pressure falling within the range of the target steam inlet pressure.

[0054] Furthermore, since the control method for the feedwater pump turbine steam supply system provided in this disclosure is used for the feedwater pump turbine steam supply system as proposed in any of the first aspects above, it possesses all the beneficial effects of the steam supply system, which will not be elaborated here.

[0055] like Figure 3 As shown, a computer-readable storage medium 301 is provided according to a third aspect of the present disclosure. The computer-readable storage medium 301 stores a computer program 302, which, when executed, implements the control method as proposed in any of the second aspects above.

[0056] Since the computer-readable storage medium 301 provided in this disclosure is used to implement the control method as proposed in any of the second aspects above, it possesses all the beneficial effects of the control method, which will not be elaborated here.

[0057] like Figure 4As shown, a control device is provided according to a fourth aspect of the present disclosure, comprising: a memory 401 storing a computer program; and a processor 402 for executing the computer program; wherein, when executing the computer program, the processor 402 implements the control method as proposed in any of the second aspects above.

[0058] Since the control device provided in this disclosure is used to implement the control method proposed in any of the second aspects above, it possesses all the beneficial effects of the control method, which will not be elaborated here.

[0059] In some examples, the control device may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, and so on. The user interface may include a display screen, input units such as a keyboard, and optional user interfaces may include USB ports, card reader ports, etc. The network interface may include standard wired interfaces, wireless interfaces (such as Wi-Fi interfaces), etc.

[0060] In an exemplary embodiment, the control device may further include an input / output interface and a display device, wherein the various functional units can communicate with each other via a bus. The memory stores a computer program, and the processor executes the program stored in the memory to implement the methods described in the above embodiments.

[0061] The aforementioned storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the physical device described above, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that this disclosure can be implemented by means of software plus necessary general-purpose hardware platform, or it can be implemented by hardware.

[0063] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0064] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0065] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0066] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A steam supply system for a feedwater pump turbine, characterized in that, include: Pressure matching device (100), the steam output end of which is used to connect to the steam inlet end of feedwater pump turbine (900); The first pipe (200) has one end connected to the high-pressure steam input terminal of the pressure matching device (100) and the other end used to connect to the reheat cold section steam. The second pipe (300) has one end connected to the low-pressure steam input end of the pressure matching device (100) and the other end used to connect to the four-stage steam extraction. A regulating valve (400) is provided on the pressure matching device (100) for regulating the input flow rate at the high-pressure steam input end.

2. The feedwater pump turbine steam supply system according to claim 1, characterized in that, Also includes: A first isolation valve (500) is disposed in the first pipeline (200) and is used to control the opening or closing of the first pipeline (200).

3. The steam supply system for a feedwater pump turbine according to claim 1, characterized in that, The number of low-pressure steam inlet terminals is multiple; the second pipe (300) includes: A low-pressure steam main pipe (310), one end of which is used to connect to the four-stage steam extraction; A low-pressure steam branch pipe (320) is connected between the low-pressure steam main pipe (310) and the low-pressure steam input end. There are multiple low-pressure steam branch pipes (320), and each low-pressure steam branch pipe (320) is arranged in a one-to-one correspondence with the low-pressure steam input end.

4. The steam supply system for a feedwater pump turbine according to claim 3, characterized in that, Also includes: The second isolation valve (600a) is disposed on the low-pressure steam main pipe (310) and is used to control the opening or closing of the low-pressure steam main pipe (310); The third isolation valve (600b) is installed on the low-pressure steam branch pipe (320) and is used to control the opening or closing of the low-pressure steam branch pipe (320).

5. The steam supply system for a feedwater pump turbine according to claim 1, characterized in that, Also includes: The third pipe has one end connected to the steam output end and the other end connected to the steam inlet end of the feedwater pump turbine (900).

6. The steam supply system for a feedwater pump turbine according to claim 5, characterized in that, Also includes: A first detection element, disposed on the pressure matching device (100), is used to detect the steam pressure information at the steam output terminal; and / or The second detection element is installed in the third pipe and is used to detect the steam pressure information in the third pipe.

7. A control method for a feedwater pump turbine steam supply system, characterized in that, For a feedwater pump turbine steam supply system as described in any one of claims 1 to 6, the control method comprises: Obtain the actual steam pressure output from the steam output terminal; The input flow rate at the high-pressure steam input terminal is adjusted according to the actual steam pressure and the target steam inlet pressure of the feedwater pump turbine.

8. The control method for the steam supply system of the feedwater pump turbine according to claim 7, characterized in that, The step of controlling the operation of the regulating valve (400) based on the actual steam pressure and the target steam inlet pressure of the feedwater pump turbine includes: When the actual steam pressure is greater than the target steam inlet pressure, the opening of the regulating valve (400) is reduced to decrease the input flow rate at the high-pressure steam inlet. When the actual steam pressure is less than the target steam inlet pressure, the opening of the regulating valve (400) is increased to increase the input flow rate at the high-pressure steam inlet. When the actual steam pressure is equal to the target steam inlet pressure, the regulating valve (400) is controlled to maintain its current opening.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed, implements the control method as described in claim 7 or 8.

10. A control device, characterized in that, include: Memory, which stores computer programs; A processor for executing the computer program; When the processor executes the computer program, it implements the control method as described in claim 7 or 8.

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