A steam source switching sequential control logic design optimization method and system for steam-driven feedwater pumps

Abstract

The present invention discloses a method and system for optimizing the sequential control logic design of steam source switching of a steam-driven feedwater pump, which relates to the field of thermal power and thermal engineering technology, and includes the following steps: setting the permission conditions for program-controlled start of auxiliary steam cutting, and if the conditions are met, opening the electric valve from the auxiliary steam to the steam-driven feedwater pump, and closing the electric valve from the four pumps to the feedwater pump; setting the prohibition conditions for program-controlled start of auxiliary steam cutting, and if the prohibition conditions are met, preventing the auxiliary steam from opening the electric valve from the feedwater pump, and sending an alarm message. By setting clear permission conditions and prohibition conditions, the present invention ensures that the steam source is switched only when specific safety standards are met, thereby reducing operational risks and potential safety accidents, and reducing the steps of manual operation through automated control, simplifying the operation process, and improving operational efficiency. The automated control logic can quickly respond to changes in system status, switch the steam source in time, and reduce the risk of system instability caused by manual operation delays.

Description

Technical Field

[0001] The invention relates to the field of thermal power technology, and in particular to a method and system for optimizing the sequential control logic design of a steam source switching of a steam-driven feedwater pump. Background Art

[0002] For example, two 1000MW supercritical units of Huaneng Nantong Power Generation Co., Ltd. are equipped with 2×50%BMCR steam-driven feedwater pumps, but no electric feedwater pumps. The steam-driven feedwater pumps have three steam sources, which are auxiliary steam, four-stage extraction, and cold regeneration. During normal operation (above 400MW), the four-stage extraction supplies steam. When the unit is started or shut down, the auxiliary steam is used. When the unit load reaches 500MW, the four-stage extraction supplies steam, and the cold regeneration serves as a backup high-pressure steam source.

[0003] Since it was put into operation in 2014, the steam source switching of the pneumatic feed water pump has been manually operated by the operating personnel. The steam source switching time is long and the operation is complicated, which places high demands on the operating personnel. There are many parameters that need to be monitored, and the operating personnel are under great pressure to monitor and operate each time. Summary of the invention

[0004] In view of the existing problems in the design optimization of the sequential control logic for the steam source switching of the steam-driven water supply pump and the system, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the steam source switching time is long and the operation is complicated, the requirements for the operating personnel are high, and many parameters need to be monitored. Each operation puts the operating personnel under great pressure to monitor the panel and operate.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for optimizing the design of a steam source switching sequential control logic of a steam-driven feedwater pump, which comprises the following steps:

[0008] Set the permissible conditions for auxiliary steam program-controlled start. If the conditions are met, open the electric valve from auxiliary steam to steam-driven feedwater pump, and close the electric valve from four-pump to driven feedwater pump.

[0009] Setting the prohibition conditions for auxiliary steam program-controlled start-up. If the prohibition conditions are met, the auxiliary steam to water supply pump electric valve is prevented from opening, and an alarm message is sent;

[0010] Set the permissible conditions for the program-controlled start of the main steam. If the conditions are met, the electric valve from the main steam to the steam-driven feedwater pump is opened, and the electric valve from the auxiliary steam to the driven feedwater pump is closed;

[0011] Set the prohibition conditions for cutting off the main steam program-controlled start. If the prohibition conditions are met, the main steam to water supply pump electric valve is prevented from opening, and an alarm message is sent.

[0012] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, the permissible conditions for the program-controlled start of auxiliary steam cutting include:

[0013] The main steam-driven pump small machine is put into automatic control;

[0014] Auxiliary steam pressure difference interlock is automatically activated;

[0015] The manual setting switch of the auxiliary steam to water supply pump electric valve is closed;

[0016] The auxiliary steam-to-dynamic feed water pump electric valve includes a manual control mode and a manual status switch. When the manual status switch is in a normal state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by the manual control mode; when the manual status switch is in a fault state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by an automatic control signal.

[0017] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, the permissible conditions for the auxiliary steam program-controlled start also include:

[0018] The load is lower than 500MW, the electric valve from 4 extractions to the small steam pump unit is fully open, the electric valve from auxiliary steam to the small steam pump unit is fully closed, and there are no faults in the valves related to the steam source switching of the small steam pump unit.

[0019] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, the steam source switching of the steam-driven feedwater pump is supplied by auxiliary steam, specifically including:

[0020] Open the auxiliary steam to electric valve, and increase the auxiliary steam source temperature by opening the drain valve in front of the auxiliary steam to steam-driven feed water pump electric valve to prepare for the subsequent steam source cut-off;

[0021] When the drain temperature meets the requirement, open the electric valve of the auxiliary steam to the feed water pump;

[0022] Close the four-pump electric valve to the feed water pump, slowly switch the steam source to the auxiliary steam supply, and after the steam source switching is completed, close the related drains that were previously opened. After the steam source switching is completed, send out a system synchronization signal.

[0023] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, the prohibition conditions of cutting auxiliary steam program control start include:

[0024] The main steam-driven pump unit was not put into automatic control;

[0025] The steam pump unit does not operate normally;

[0026] The manual state switch of the auxiliary steam to water pump electric valve is faulty;

[0027] The valve related to the steam source switching of the steam pump is faulty.

[0028] The valve failures related to the steam source switching of the steam pump small machine include: manual setting switch failure;

[0029] If any of the above conditions is met, the auxiliary steam to water pump electric valve is prevented from opening, and an alarm message is sent;

[0030] The automatic control system of the auxiliary steam to the electric valve of the feed water pump fails and sends an alarm message.

[0031] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, the automatic control system failure of the auxiliary steam to the electric valve of the steam-driven feedwater pump specifically includes:

[0032] Start the interlocking failure of the auxiliary steam to the electric valve of the feed water pump;

[0033] Start the auxiliary steam to drive the electric valve of the feed water pump;

[0034] Operation failure of opening or closing the auxiliary steam to feed water pump electric valve;

[0035] Operational failure of the auxiliary steam to the electric valve of the feed water pump;

[0036] Interlock failure of switching the auxiliary steam to the electric valve of the feed water pump.

[0037] As a preferred solution of the steam source switching sequential control logic design optimization method of the steam-driven feedwater pump of the present invention, wherein: the automatic control system fault also includes a first fault and a second fault;

[0038] When the first fault occurs, part of the control signal of the auxiliary steam to dynamic feed water pump electric valve is cut off, the operation of the auxiliary steam to dynamic feed water pump electric valve is manually controlled, the activation and deactivation state of the auxiliary steam to dynamic feed water pump electric valve needs to be manually activated, and an alarm signal is issued in the DCS system;

[0039] When the second fault occurs, all control signals of the auxiliary steam to dynamic feed water pump electric valves are cut off, the operation of the auxiliary steam to dynamic feed water pump electric valves can only be controlled manually, the activation and deactivation status of the auxiliary steam to dynamic feed water pump electric valves cannot be manually activated, and an alarm signal is issued in the DCS system.

[0040] In a second aspect, an embodiment of the present invention provides a steam source switching sequential control logic design optimization system for a steam-driven feedwater pump, which includes a controller, input and output modules, a redundancy module, and a power supply module;

[0041] The controller is responsible for receiving input signals, processing data and outputting control commands. In the steam source switching sequential control logic design of the steam-driven feedwater pump, the controller is used to set the permission conditions and prohibition conditions, and open or close the electric valve according to these conditions;

[0042] The input and output modules are responsible for communicating with field devices, collecting sensor signals and sending control signals to actuators;

[0043] The redundant module provides a backup function to ensure seamless switching to the backup system when a failure occurs in the main system, thereby ensuring system reliability;

[0044] The power supply module provides a stable power supply for the entire system.

[0045] In a third aspect, an embodiment of the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, it implements any step of the above-mentioned method for optimizing the steam source switching sequential control logic design of a steam-driven feedwater pump.

[0046] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned method for optimizing the design of the steam source switching sequential control logic of a steam-driven feedwater pump is implemented.

[0047] The beneficial effects of the present invention are as follows: by setting clear permission conditions and prohibition conditions, the method ensures that steam source switching is performed only when specific safety standards are met, thereby reducing operational risks and potential safety accidents, and through automated control, the steps of manual operation are reduced, the operation process is simplified, and operational efficiency is improved. The automated control logic can quickly respond to changes in system status, switch steam sources in a timely manner, and reduce the risk of system instability caused by manual operation delays. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work. Among them:

[0049] Figure 1 Flowchart of the optimization method for designing the sequential control logic of steam source switching of steam-driven feedwater pumps.

[0050] Figure 2 The steam source of the steam-driven feedwater pump is switched from four-stage extraction to auxiliary steam program control, which is an optimization method for designing sequential control logic for switching steam source of the steam-driven feedwater pump.

[0051] Figure 3 The steam source of the steam-driven feedwater pump is switched from auxiliary steam to four-pump program control by an optimization method for designing sequential control logic for switching steam source of the steam-driven feedwater pump. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0055] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0056] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Example 1

[0059] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, and provides a method for optimizing the sequential control logic design of a steam source switching of a steam-driven feedwater pump, comprising the following steps:

[0060] S1. Set the conditions for auxiliary steam program-controlled start. If the conditions are met, open the electric valve from auxiliary steam to steam-driven feedwater pump, and close the electric valve from four-pump to driven feedwater pump;

[0061] The conditions for enabling the program-controlled start of auxiliary steam cutting include:

[0062] The main steam-driven pump small machine is put into automatic control;

[0063] Auxiliary steam pressure difference interlock is automatically activated;

[0064] The manual setting switch of the auxiliary steam to water supply pump electric valve is closed;

[0065] The auxiliary steam-to-dynamic feed water pump electric valve includes a manual control mode and a manual status switch. When the manual status switch is in a normal state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by the manual control mode; when the manual status switch is in a fault state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by an automatic control signal.

[0066] The conditions for enabling the program-controlled start of auxiliary steam cutting also include:

[0067] The load is lower than 500MW, the electric valve from 4 extractions to the small steam pump unit is fully open, the electric valve from auxiliary steam to the small steam pump unit is fully closed, and there are no faults in the valves related to the steam source switching of the small steam pump unit.

[0068] S2. Setting the prohibition condition for auxiliary steam program-controlled start. If the prohibition condition is met, the auxiliary steam to dynamic feed water pump electric valve is prevented from opening, and an alarm message is sent, wherein the auxiliary steam to dynamic feed water pump electric valve is an electric valve under the auxiliary steam supply source, and the auxiliary steam to dynamic feed water pump electric valve is used to control the steam inlet of the auxiliary steam supply source;

[0069] The steam source of the steam-driven feedwater pump is switched by auxiliary steam, including:

[0070] Open the auxiliary steam to electric valve, and increase the auxiliary steam source temperature by opening the drain valve in front of the auxiliary steam to steam-driven feed water pump electric valve to prepare for the subsequent steam source cut-off;

[0071] When the drain temperature meets the requirement, open the electric valve of the auxiliary steam to the feed water pump;

[0072] Close the four-pump electric valve to the feed water pump, slowly switch the steam source to the auxiliary steam supply, and after the steam source switching is completed, close the related drains that were previously opened. After the steam source switching is completed, send out a system synchronization signal.

[0073] The prohibited conditions for auxiliary steam program control start include:

[0074] The main steam-driven pump unit was not put into automatic control;

[0075] The steam pump unit does not operate normally;

[0076] The manual state switch of the auxiliary steam to water pump electric valve is faulty;

[0077] The valve related to the steam source switching of the steam pump is faulty.

[0078] The valve failures related to the steam source switching of the steam pump small machine include: manual setting switch failure;

[0079] If any of the above conditions is met, the auxiliary steam to water pump electric valve is prevented from opening, and an alarm message is sent;

[0080] The automatic control system of the auxiliary steam to the electric valve of the feed water pump fails and sends an alarm message.

[0081] S3. Set the permissible conditions for the program-controlled start of the main steam. If the conditions are met, open the electric valve from the main steam to the steam-driven feed water pump, and close the electric valve from the auxiliary steam to the powered feed water pump.

[0082] The automatic control system failure of the auxiliary steam to the electric valve of the feed water pump specifically includes:

[0083] Start the interlocking failure of the auxiliary steam to the electric valve of the feed water pump;

[0084] Start the auxiliary steam to drive the electric valve of the feed water pump;

[0085] Operation failure of opening or closing the auxiliary steam to feed water pump electric valve;

[0086] Operational failure of the auxiliary steam to the electric valve of the feed water pump;

[0087] Interlock failure of switching the auxiliary steam to the electric valve of the feed water pump.

[0088] S4. Set the prohibition conditions for cutting off the main steam program-controlled start. If the prohibition conditions are met, the main steam to water supply pump electric valve is prevented from opening, and an alarm message is sent.

[0089] The automatic control system fault also includes a first fault and a second fault;

[0090] When the first fault occurs, part of the control signal of the auxiliary steam to dynamic feed water pump electric valve is cut off, the operation of the auxiliary steam to dynamic feed water pump electric valve is manually controlled, the activation and deactivation state of the auxiliary steam to dynamic feed water pump electric valve needs to be manually activated, and an alarm signal is issued in the DCS system;

[0091] When the second fault occurs, all control signals of the auxiliary steam to dynamic feed water pump electric valves are cut off, the operation of the auxiliary steam to dynamic feed water pump electric valves can only be controlled manually, the activation and deactivation status of the auxiliary steam to dynamic feed water pump electric valves cannot be manually activated, and an alarm signal is issued in the DCS system.

[0092] like Figure 1 and Figure 2 As shown, when the steam source switching sequence permission conditions of the steam-driven feedwater pump are met, the operator can enter the sequence control with one button to perform the steam source switching operation of the steam-driven feedwater pump.

[0093] The permissible conditions for cutting off the auxiliary steam and starting the program-controlled operation include: the load is lower than 500MW, the electric valve from 4 extractions to the small steam pump unit is fully open, the electric valve from the auxiliary steam to the small steam pump unit is fully closed, and there are no faults in the valves related to the steam source switching of the small steam pump unit.

[0094] The permissible conditions for the program-controlled start of four-pump operation include: the load is higher than 300MW, the electric valve from 4 pumps to the small steam pump is fully closed, the electric valve from the auxiliary steam to the small steam pump is fully open, and there are no faults in the valves related to the steam source switching of the small steam pump.

[0095] The specific steps of auxiliary steam cut-off sequential control start are as follows: 1: Open the drain valve in front of the auxiliary steam to the steam pump small machine valve, 2: Open the auxiliary steam to the steam pump small machine A electric valve, 3: Close the four-pump to the steam pump small machine A electric valve, 4: Open the auxiliary steam to the steam pump small machine B electric valve, 5: Close the four-pump to the steam pump small machine B electric valve, 6: Close the drain valve in front of the auxiliary steam to the steam pump small machine valve

[0096] The specific steps for starting the four-extraction sequence control are as follows: 1: Open the drain valve in front of the valve from the four-extraction to the small steam pump, 2: Open the electric valve from the four-extraction to the small steam pump A, 3: Close the electric valve from the auxiliary steam to the small steam pump A, 4: Open the electric valve from the four-extraction to the small steam pump B, 5: Close the electric valve from the auxiliary steam to the small steam pump B, 6: Close the drain valve in front of the valve from the four-extraction to the small steam pump.

[0097] When the operator finds that the sequential control seriously affects the safety of the unit during execution, or other emergencies occur, the sequential control can be manually reset by one-key reset, and the sequential control will be initialized after reset.

[0098] When the operator finds that the one-key sequence control cannot be executed at a certain step and the step operation will not affect the entire sequence control operation, the step skip operation can be executed.

[0099] In summary, by setting clear permission conditions and prohibition conditions, this method ensures that steam source switching is performed only when specific safety standards are met, thereby reducing operational risks and potential safety accidents. In addition, automated control reduces the number of manual operation steps, simplifies the operating process, and improves operational efficiency. The automated control logic can quickly respond to changes in system status and perform steam source switching in a timely manner, reducing the risk of system instability caused by manual operation delays.

[0100] Example 2

[0101] On the basis of the first embodiment, this embodiment further provides a steam-driven feedwater pump steam source switching sequential control logic design optimization system, including a controller, input and output modules, a redundancy module, and a power module;

[0102] The controller is responsible for receiving input signals, processing data and outputting control commands. In the steam source switching sequential control logic design of the steam-driven feedwater pump, the controller is used to set the permission conditions and prohibition conditions, and open or close the electric valve according to these conditions;

[0103] The input and output modules are responsible for communicating with field devices, collecting sensor signals and sending control signals to actuators;

[0104] The redundant module provides a backup function to ensure seamless switching to the backup system when a failure occurs in the main system, thereby ensuring system reliability;

[0105] The power supply module provides a stable power supply for the entire system.

[0106] This embodiment also provides a computer device, which is suitable for the case of a steam-driven feedwater pump steam source switching sequential control logic design optimization method, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the steam-driven feedwater pump steam source switching sequential control logic design optimization method proposed in the above embodiment.

[0107] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0108] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for optimizing the design of sequential control logic for steam source switching of a steam-driven feedwater pump as proposed in the above embodiment is implemented.

[0109] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A steam source switching sequential control logic design optimization method for a steam-driven feedwater pump, characterized in that: The following steps are included: Set the permissible conditions for auxiliary steam program-controlled start. If the conditions are met, open the electric valve from auxiliary steam to steam-driven feedwater pump, and close the electric valve from four-pump to driven feedwater pump. Setting the prohibition conditions for auxiliary steam program-controlled start-up. If the prohibition conditions are met, the auxiliary steam to water supply pump electric valve is prevented from opening, and an alarm message is sent; Set the permissible conditions for cutting off the main steam program control start. If the conditions are met, the electric valve from the main steam to the steam-driven feed water pump will be opened, and the electric valve from the auxiliary steam to the driven feed water pump will be closed; Set the prohibition conditions for cutting off the main steam program-controlled start. If the prohibition conditions are met, the main steam to water supply pump electric valve is prevented from opening, and an alarm message is sent.

2. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 1 is characterized in that: The conditions for enabling the program-controlled start of auxiliary steam cutting include: The main steam-driven pump small machine is put into automatic control; Auxiliary steam pressure difference interlock is automatically activated; The manual setting switch of the auxiliary steam to water supply pump electric valve is closed; The auxiliary steam-to-dynamic feed water pump electric valve includes a manual control mode and a manual status switch. When the manual status switch is in a normal state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by the manual control mode; when the manual status switch is in a fault state, the auxiliary steam-to-dynamic feed water pump electric valve is controlled by an automatic control signal.

3. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 2 is characterized in that: The conditions for enabling the program-controlled start of auxiliary steam cutting also include: The load is lower than 500MW, the electric valve from 4 extractions to the small steam pump unit is fully open, the electric valve from auxiliary steam to the small steam pump unit is fully closed, and there are no faults in the valves related to the steam source switching of the small steam pump unit.

4. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 3 is characterized in that: The steam source of the steam-driven feedwater pump is switched by auxiliary steam, including: Open the auxiliary steam to electric valve, and increase the auxiliary steam source temperature by opening the drain valve in front of the auxiliary steam to steam-driven feed water pump electric valve to prepare for the subsequent steam source cut-off; When the drain temperature meets the requirement, open the electric valve of the auxiliary steam to the feed water pump; Close the four-pump electric valve to the feed water pump, slowly switch the steam source to the auxiliary steam supply, and after the steam source switching is completed, close the related drains that were previously opened. After the steam source switching is completed, send out a system synchronization signal.

5. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 4 is characterized in that: The prohibited conditions for auxiliary steam program control start include: The main steam-driven pump unit was not put into automatic control; The steam pump unit does not operate normally; The manual state switch of the auxiliary steam to water pump electric valve is faulty; The valve related to the steam source switching of the steam pump is faulty. The valve failures related to the steam source switching of the steam pump small machine include: manual setting switch failure; If any of the above conditions is met, the auxiliary steam to water pump electric valve is prevented from opening, and an alarm message is sent; The automatic control system of the auxiliary steam to the electric valve of the feed water pump fails and sends an alarm message.

6. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 5, characterized in that: The automatic control system failure of the auxiliary steam to the electric valve of the feed water pump specifically includes: Start the interlocking failure of the auxiliary steam to the electric valve of the feed water pump; Start the auxiliary steam to drive the electric valve of the feed water pump; Operation failure of opening or closing the auxiliary steam to feed water pump electric valve; Operational failure of the auxiliary steam to the electric valve of the feed water pump; Interlock failure of switching the auxiliary steam to the electric valve of the feed water pump.

7. The steam source switching sequential control logic design optimization method for a steam-driven feedwater pump according to claim 6, characterized in that: The automatic control system fault also includes a first fault and a second fault; When the first fault occurs, part of the control signal of the auxiliary steam to dynamic feed water pump electric valve is cut off, the operation of the auxiliary steam to dynamic feed water pump electric valve is manually controlled, the activation and deactivation state of the auxiliary steam to dynamic feed water pump electric valve needs to be manually activated, and an alarm signal is issued in the DCS system; When the second fault occurs, all control signals of the auxiliary steam to dynamic feed water pump electric valves are cut off, the operation of the auxiliary steam to dynamic feed water pump electric valves can only be controlled manually, the activation and deactivation status of the auxiliary steam to dynamic feed water pump electric valves cannot be manually activated, and an alarm signal is issued in the DCS system.

8. A steam-driven feedwater pump steam source switching sequential control logic design optimization system, based on the steam-driven feedwater pump steam source switching sequential control logic design optimization method according to any one of claims 1 to 7, characterized in that: Includes controller, input and output modules, redundancy modules, and power supply modules; The controller is responsible for receiving input signals, processing data and outputting control commands. In the steam source switching sequential control logic design of the steam-driven feedwater pump, the controller is used to set the permission conditions and prohibition conditions, and open or close the electric valve according to these conditions; The input and output modules are responsible for communicating with field devices, collecting sensor signals and sending control signals to actuators; The redundant module provides a backup function to ensure seamless switching to the backup system when a failure occurs in the main system, thereby ensuring system reliability; The power supply module provides a stable power supply for the entire system.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for designing and optimizing the steam source switching sequential control logic of a steam-driven feedwater pump as described in any one of claims 1 to 7 are implemented.

10. 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 method for designing and optimizing the steam source switching sequential control logic of a steam-driven feedwater pump as described in any one of claims 1 to 7 are implemented.

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