A step heat supply back pressure machine shaft seal cooling water system and operation optimization method

Abstract

The application provides a step heat supply back pressure machine shaft seal cooling water system and an operation optimization method, and the system comprises: a thermal power generating unit, a back pressure machine, a shaft seal cooler, a thermal power generating unit condenser, a drain pump, a vacuum isolation valve, a cooling water pressure boosting module, a thermal power generating unit condensate pump and a deaerator water regulating valve; part of high-temperature steam generated by the thermal power generating unit enters the back pressure machine, shaft seal leakage gas of the back pressure machine enters the shaft seal cooler, a first part of condensate water generated by the thermal power generating unit condenser enters the shaft seal cooler through the thermal power generating unit condensate pump, the shaft seal leakage gas heats the first part of condensate water in the shaft seal cooler, and then enters the thermal power generating unit condenser through the drain pump and the vacuum isolation valve; the first part of condensate water is heated, and then flows into a low-pressure heater system through the cooling water pressure boosting module; and a second part of condensate water flows into the low-pressure heater system through the thermal power generating unit condensate pump and the deaerator water regulating valve. The scheme can improve energy utilization.

Description

Technical Field

[0001] This application relates to the field of heating, and in particular to a cooling water system for the shaft seal of a cascade heating back pressure machine and a method for optimizing its operation. Background Technology

[0002] Back-pressure turbine cascade heating is a commonly used heating solution for power generation companies in the process of industrial steam supply. In order to ensure the efficient and stable operation of back-pressure heating units, it is necessary to configure corresponding shaft seal cooling water systems for back-pressure heating units.

[0003] In related technologies, the shaft seal cooling water system operates as an independent cooling water system, which does not make full use of the residual heat from the leakage of the back pressure shaft seal, resulting in a certain waste of resources. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] In a first aspect, this application proposes a method for cooling water for the shaft seal of a back-pressure turbine in a cascade heating system, comprising: a thermal power unit, a back-pressure turbine, a shaft seal cooler, a thermal power unit condenser, a drain pump, a vacuum isolation valve, a cooling water booster module, a thermal power unit condensate pump, and a deaerator water supply regulating valve; wherein, a portion of the high-temperature steam generated by the thermal power unit enters the back-pressure turbine, the shaft seal leakage of the back-pressure turbine enters the shaft seal cooler, a first portion of the condensate generated by the thermal power unit condenser enters the shaft seal cooler via the thermal power unit condensate pump, the shaft seal leakage heats the first portion of the condensate in the shaft seal cooler and then enters the thermal power unit condenser via the drain pump and the vacuum isolation valve, the first portion of the condensate, after being heated, flows into the low-pressure heater system via the cooling water booster module, and a second portion of the condensate flows into the low-pressure heater system via the thermal power unit condensate pump and the deaerator water supply regulating valve.

[0006] In one implementation, the cooling water booster module includes at least one pipeline unit and a bypass unit connected in parallel; wherein each pipeline unit includes, in sequence, an inlet valve, a shaft seal cooling water booster pump, a check valve, and an outlet valve, and the bypass unit includes a bypass valve.

[0007] In one optional implementation, the system is specifically used to: obtain a first operating power of the thermal power unit condensate pump when the back pressure turbine is not running; obtain a second operating power of the thermal power unit condensate pump when the back pressure turbine is running and the at least one pipeline unit is closed; obtain a third operating power of the shaft seal cooling water booster pump; and control the pipeline unit and the bypass unit based on the first operating power, the second operating power and the operating power.

[0008] Optionally, the system is specifically configured to: in response to the power difference between the first operating power and the second operating power being greater than the operating power, open the inlet valve, the cooling water booster pump, and the outlet valve of the first pipeline unit in the at least one pipeline unit, and close the inlet valve, the cooling water booster pump, and the outlet valve of the other pipeline units, and close the bypass valve in the bypass unit; wherein the first pipeline unit is any one of the at least one pipeline unit; or, in response to the power difference between the first operating power and the second operating power being less than or equal to the operating power, close the inlet valve, the cooling water booster valve, and the outlet valve in all the pipeline units, and open the bypass valve in the bypass unit.

[0009] Optionally, there are multiple pipeline units, and different pipeline units are interlocked and linked together.

[0010] Optionally, the system is specifically used to: in response to a failure in the first pipeline unit, to simultaneously open the inlet valve, the cooling water booster pump, and the outlet valve in the second pipeline unit; wherein, the second pipeline unit is any one of the at least one pipeline units other than the first pipeline unit.

[0011] In one implementation, the system is further configured to: obtain the operating load of the thermal power unit; and adjust the opening degree of the deaerator water regulating valve based on the operating load.

[0012] Secondly, this application proposes an operation optimization method for a cascade heating back-pressure turbine shaft seal cooling water system. The method is applied to the control system of the cascade heating back-pressure turbine shaft seal cooling water system as described in the first aspect. The method includes: obtaining a first operating power of the condensate pump of the thermal power unit when the back-pressure turbine is not running; obtaining a second operating power of the condensate pump of the thermal power unit when the back-pressure turbine is running and at least one pipeline unit is closed; obtaining a third operating power of the shaft seal cooling water booster pump; and controlling the pipeline unit and the bypass unit based on the first operating power, the second operating power, and the operating power.

[0013] In one implementation, controlling the piping unit and the bypass unit based on the first operating power, the second operating power, and the operating power includes: in response to a power difference between the first operating power and the second operating power being greater than the operating power, opening the inlet valve, the cooling water booster pump, and the outlet valve of the first piping unit in the at least one piping unit, and closing the inlet valves, the cooling water booster pump, and the outlet valve of the other piping units, and closing the bypass valve in the bypass unit; wherein the first piping unit is any one of the at least one piping unit; or, in response to a power difference between the first operating power and the second operating power being less than or equal to the operating power, closing the inlet valves, the cooling water booster valves, and the outlet valves of all the piping units, and opening the bypass valve in the bypass unit.

[0014] Thirdly, this application proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method described in the second aspect.

[0015] Fourthly, this application proposes a computer-readable storage medium for storing instructions that, when executed, cause the method described in the first aspect to be implemented.

[0016] Fifthly, this application proposes a computer program product, including a computer program that, when executed by a processor, implements the steps of the cascade heating back pressure machine shaft seal cooling water method as described in the first aspect.

[0017] The cascade heating back-pressure turbine shaft seal cooling water system and operation optimization method provided in this application can use the condensate of the thermal power unit as the cooling water source for the shaft seal cooler of the cascade heating back-pressure turbine. Based on the difference in operating power of the thermal power unit condensate pump under different operating conditions and the third operating power of the shaft seal cooling water booster pump, the operation mode of the shaft seal cooling water system is switched, thereby reducing energy consumption and improving energy utilization.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1This is a schematic diagram of the structure of a cascade heating back pressure machine shaft seal cooling water system provided in an embodiment of this application;

[0021] Figure 2 This is a flowchart illustrating an operation optimization method for a cascade heating back pressure machine shaft seal cooling water system provided in an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The following description, with reference to the accompanying drawings, describes a method and apparatus for cooling water for the shaft seal of a cascade heating back pressure machine according to embodiments of this application.

[0025] Figure 1 This is a structural schematic diagram of a cascade heating back pressure machine shaft seal cooling water system provided in an embodiment of this application. Figure 1 As shown, the system may include: a thermal power unit 1, a back pressure turbine 2, a shaft seal cooler 3, a thermal power unit condenser 4, a drain pump 5, a vacuum isolation valve 6, a cooling water booster module 7, a thermal power unit condensate pump 8, and a deaerator water regulating valve 9. Specifically, a portion of the high-temperature steam generated by the thermal power unit 1 enters the back pressure turbine 2; the shaft seal leakage of the back pressure turbine 2 enters the shaft seal cooler 3; the first portion of condensate generated by the thermal power unit condenser 4 enters the shaft seal cooler 3 via the thermal power unit condensate pump 8; the shaft seal leakage heats the first portion of condensate in the shaft seal cooler 3, and then enters the thermal power unit condenser 7 via the drain pump 5 and the vacuum isolation valve 6; the first portion of condensate, after being heated, flows into the low-pressure heater system via the cooling water booster module 7; and the second portion of condensate flows into the low-pressure heater system via the thermal power unit condensate pump 8 and the deaerator water regulating valve 9.

[0026] Specifically, a portion of the high-temperature steam generated during the operation of the thermal power unit 1 enters the back pressure turbine 2. The shaft seal leakage of the back pressure turbine 2 is drawn into the shaft seal cooler 3. Simultaneously, through a bypass pipeline added after the outlet of the thermal power unit condensate pump 8 connected to the thermal power unit condenser 4, the first portion of the condensate generated by the thermal power unit condenser 4 and output by the thermal power unit condensate pump 8 is input into the shaft seal cooler 3. This first portion of condensate is used as the shaft seal cooling water for the back pressure turbine 2. After being heated by the shaft seal leakage in the back pressure turbine shaft seal cooler 3, this first portion of condensate flows through the cooling water booster module into the low-pressure heater system. After the shaft seal leakage is cooled and condensed, it is drained by the drain pump 5 and then enters the thermal power unit condenser 4 through the vacuum isolation valve 6. At the same time, the second portion of condensate output by the thermal power unit condensate pump 8 flows into the low-pressure heater system through the deaerator water regulating valve 9.

[0027] It should be noted that, in the embodiments of this application, a portion of the high-pressure steam generated by the boiler can be led out through a three-way pipe installed at the outlet of the boiler superheater of the thermal power unit 1 and input into the back pressure machine 2 via electric valve 10, regulating valve 11, and electric valve 12. Thus, the back pressure machine 2 can use the input high-pressure steam to drive the generator to generate electricity. After doing work, the exhaust steam from the back pressure machine passes through check valve 13, pneumatic quick-closing valve 14, and electric valve 15 in sequence to supply heat to the heat user 16.

[0028] In some embodiments, the cooling water booster module 7 includes at least one pipeline unit 71 and a bypass unit 72 connected in parallel; wherein each pipeline unit 71 includes an inlet valve 711, a shaft seal cooling water booster pump 712, a check valve 713 and an outlet valve 714 in sequence, and the bypass unit 72 includes a bypass valve 721. Figure 1 The example includes two piping units 71.

[0029] In some embodiments, the inlet valve 711 described above is an electric valve.

[0030] In some embodiments, the outlet valve 714 described above is an electric valve.

[0031] In some embodiments, the bypass valve 721 described above is an electric valve.

[0032] In some embodiments, the above system is specifically used to: obtain a first operating power of the thermal power unit condensate pump 8 when the back pressure unit 2 is not running; obtain a second operating power of the thermal power unit condensate pump 8 when the back pressure unit 2 is running and at least one pipeline unit 71 is closed; obtain a third operating power of the shaft seal cooling water booster pump 712; and control at least one pipeline unit 71 and bypass unit 72 based on the first operating power, the second operating power and the operating power.

[0033] In one optional implementation, the system is specifically configured to: in response to the power difference between the first operating power and the second operating power being greater than the operating power, open the inlet valve 711, cooling water booster pump 712, and outlet valve 713 of at least one piping unit 71, and close the inlet valve 711, cooling water booster pump 712, and outlet valve 713 of other piping units, and close the bypass valve 721 in the bypass unit 72; wherein the first piping unit is any one of at least one piping unit 71; or, in response to the power difference between the first operating power and the second operating power being less than or equal to the operating power, close the inlet valve 711, cooling water booster valve 712, and outlet valve 713 of all piping units, and open the bypass valve 721 in the bypass unit 72.

[0034] As an example, in response to the power difference between the first operating power and the second operating power being greater than the operating power, the inlet valve 711, cooling water booster pump 712, and outlet valve 713 of any one of the first piping units 71 are opened, thereby allowing the cooling water flowing out of the shaft seal cooler to flow normally into the low-pressure heater system through the opened first piping unit. Simultaneously, the inlet valves 711, cooling water booster pump 712, and outlet valves 713 of all other piping units except the first piping unit are closed, and the bypass valve 721 in the bypass unit 72 is closed.

[0035] As an example, if the power difference between the first operating power and the second operating power is less than or equal to the operating power, it can be determined that the power of the shaft seal cooling water booster pump 712 is relatively high, requiring the bypass unit 72 to be put into operation. At this time, the bypass electric valve 721 of the bypass unit is opened, the inlet electric valve 711 and outlet electric valve 714 of all pipeline units 71 are closed, and the operation of the shaft seal cooling water booster pump 712 in all pipeline units 71 is stopped. This allows the back pressure compressor shaft seal cooling water to flow into the low-pressure heater system through the bypass unit 72.

[0036] In some embodiments, there are multiple pipeline units 71, and different pipeline units 71 are interlocked and linked together.

[0037] It is understandable that by setting interlocking links between different pipeline units 71, only one of the multiple pipeline units can be in the open state at any given time.

[0038] In some embodiments, the system is specifically used to: in response to a failure in the first pipeline unit, to simultaneously open the inlet valve 711, the cooling water booster pump 712, and the outlet valve 714 in the second pipeline unit; wherein the second pipeline unit is any one of the at least one pipeline unit other than the first pipeline unit.

[0039] Specifically, interlocking linkages are established between different piping units 71. When the shaft seal cooling water booster pump 712 in the first piping unit through which the cooling water flowing from the shaft seal cooler 3 currently flows malfunctions (e.g., trips), the inlet electric valve 711 and outlet electric valve 714 of that first piping unit are closed, and the inlet electric valve 711 and outlet electric valve 714 of any second piping unit other than the first piping unit are opened, starting the shaft seal cooling water booster pump 712 of the second piping unit. This ensures that the cooling water flowing from the shaft seal cooler 3 can normally flow into the low-pressure heater system through the piping units.

[0040] In some embodiments, the system is further configured to: in response to the power difference between the first operating power and the second operating power being less than or equal to the operating power, close the inlet valve 711, the cooling water pressure boosting valve 712 and the outlet valve 714 in all piping units, and open the bypass valve 721 in the bypass unit 72.

[0041] Specifically, if the power difference between the first operating power and the second operating power is less than or equal to the operating power, it can be determined that the power of the shaft seal cooling water booster pump 712 is relatively high, requiring the bypass unit to be put into operation. At this time, the bypass electric valve 721 of the bypass unit is opened, the inlet electric valve 711 and outlet electric valve 714 of all pipeline units are closed, and the operation of the shaft seal cooling water booster pump 712 in all pipeline units is stopped. This allows the back pressure compressor shaft seal cooling water to flow into the low-pressure heater system through the bypass unit.

[0042] In some embodiments, the system is further configured to: obtain the operating load of the thermal power unit; and adjust the opening of the deaerator water regulating valve based on the operating load.

[0043] Specifically, during system operation, the opening of the deaerator water regulating valve is adjusted in real time based on the operating load of the thermal power unit, thereby ensuring that the deaerator water level is in a safe operating state.

[0044] The system of this application embodiment can use the condensate of thermal power units as the cooling water source for the shaft seal cooler of the back pressure turbine in a cascade heating system. Based on the difference in operating power of the condensate pump of the thermal power unit under different operating conditions and the third operating power of the shaft seal cooling water booster pump, the operating mode of the shaft seal cooling water system can be switched, thereby reducing energy consumption and improving energy utilization.

[0045] Please see Figure 2 , Figure 2 This is a flowchart illustrating an operation optimization method for a cascade heating back-pressure turbine shaft seal cooling water system provided in an embodiment of this application. This method can be applied to, for example... Figure 1 The illustrated cascade heating back pressure turbine shaft seal cooling water system is shown. Figure 2 As shown, the method may include, but is not limited to, the following steps:

[0046] Step S201: Obtain the first operating power of the condensate pump of the thermal power unit when the back pressure turbine is not running.

[0047] Step S202: Obtain the second operating power of the thermal power unit condensate pump when the back pressure unit is running and all pipeline units are closed.

[0048] Specifically, the second operating power of the condensate pump of the thermal power unit is obtained when the back pressure turbine is running and all pipeline units are not running.

[0049] Step S203: Obtain the third operating power of the shaft seal cooling water booster pump.

[0050] Step S204: Based on the first operating power, the second operating power, and the operating power, control the pipeline unit and the bypass unit.

[0051] Specifically, the difference in operating power of the condensate pump of the thermal power unit under different conditions is obtained based on the first operating power and the second operating power. Based on this difference and the third operating power of the shaft seal cooling water booster pump, the opening and closing of the pipeline unit and the bypass unit are controlled.

[0052] In one optional implementation, the control of the piping unit and bypass unit based on the first operating power, the second operating power, and the operating power includes: in response to the power difference between the first operating power and the second operating power being greater than the operating power, opening the inlet valve, cooling water booster pump, and outlet valve of the first piping unit in at least one piping unit, and closing the inlet valve, cooling water booster pump, and outlet valve of other piping units, and closing the bypass valve in the bypass unit; wherein the first piping unit is any one of the at least one piping unit; or, in response to the power difference between the first operating power and the second operating power being less than or equal to the operating power, closing the inlet valve, cooling water booster valve, and outlet valve in all piping units, and opening the bypass valve in the bypass unit.

[0053] As an example, in response to the power difference between the first operating power and the second operating power being greater than the operating power, the inlet valve, cooling water booster pump, and outlet valve of any one of the at least one piping units are opened, thereby allowing the cooling water flowing out of the shaft seal cooler to flow normally into the low-pressure heater system through the opened piping unit. Simultaneously, the inlet valves, cooling water booster pumps, and outlet valves of all other piping units besides the opened ones are closed, and the bypass valve in the bypass unit is also closed.

[0054] As an example, in response to the power difference between the first operating power and the second operating power being less than or equal to the operating power, the inlet valves, cooling water booster valves, and outlet valves in all piping units are closed, and the bypass valve in the bypass unit is opened, so that the cooling water flowing out of the shaft seal cooler can flow normally into the low-pressure heater system through the bypass unit.

[0055] By trying the embodiments of this application, the operating mode of the shaft seal cooling water system can be switched based on the difference in operating power of the condensate pump of the thermal power unit under different operating conditions and the third operating power of the shaft seal cooling water booster pump, thereby reducing energy consumption and improving energy utilization.

[0056] To implement the above embodiments, this application also proposes an electronic device. Please see [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. For example... Figure 3 As shown, the electronic device 300 includes: a processor 301, and a memory 302 communicatively connected to the processor 301; the memory 302 stores computer execution instructions; the processor 301 executes the computer execution instructions stored in the memory to implement the method provided in the foregoing embodiments.

[0057] To implement the above embodiments, this application also proposes a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods provided in the foregoing embodiments.

[0058] To implement the above embodiments, this application also proposes a computer program product, including a computer program that, when executed by a processor, implements the methods provided in the foregoing embodiments.

[0059] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0062] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0063] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0064] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0065] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0066] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A step-heating back pressure engine shaft seal cooling water system characterized by, include: Thermal power units, back pressure turbines, shaft seal coolers, thermal power unit condensers, condensate pumps, vacuum isolation valves, cooling water booster modules, thermal power unit condensate pumps, and deaerator water supply regulating valves; among which... A portion of the high-temperature steam generated by the thermal power unit enters the back pressure turbine. The shaft seal leakage of the back pressure turbine enters the shaft seal cooler. The first portion of the condensate generated by the condenser of the thermal power unit enters the shaft seal cooler via the thermal power unit condensate pump. The shaft seal leakage heats the first portion of the condensate in the shaft seal cooler and then enters the thermal power unit condenser via the drain pump and the vacuum isolation valve. After being heated, the first portion of the condensate flows into the low-pressure heater system via the cooling water booster module. The second portion of the condensate flows into the low-pressure heater system via the thermal power unit condensate pump and the deaerator water regulating valve. The cooling water booster module includes at least one pipeline unit and a bypass unit connected in parallel; wherein each pipeline unit includes, in sequence, an inlet valve, a shaft seal cooling water booster pump, a check valve and an outlet valve, and the bypass unit includes a bypass valve; The system is specifically used for: Obtain the first operating power of the condensate pump of the thermal power unit when the back pressure machine is not running; The second operating power of the thermal power unit condensate pump is obtained when the back pressure machine is running and the at least one pipeline unit is closed. Obtain the third operating power of the shaft seal cooling water booster pump; The piping unit and the bypass unit are controlled based on the first operating power, the second operating power and the third operating power.

2. The system of claim 1, wherein, The system is specifically used for: In response to the power difference between the first operating power and the second operating power being greater than the third operating power, the inlet valve, the cooling water booster pump, and the outlet valve of the first piping unit in the at least one piping unit are opened, and the inlet valves, the cooling water booster pump, and the outlet valves of the other piping units are closed, and the bypass valve in the bypass unit is closed; wherein, the first piping unit is any one of the at least one piping unit; or, In response to the power difference between the first operating power and the second operating power being less than or equal to the third operating power, the inlet valves, the cooling water booster pump, and the outlet valves in all the piping units are closed, and the bypass valve in the bypass unit is opened.

3. The system of claim 2, wherein, There are multiple pipeline units, and different pipeline units are interlocked and linked together.

4. The system of claim 3, wherein, The system is specifically used to: in response to a fault in the first pipeline unit, to simultaneously open the inlet valve, the cooling water booster pump, and the outlet valve in the second pipeline unit; wherein, the second pipeline unit is any one of the at least one pipeline units other than the first pipeline unit.

5. The system of claim 1, wherein, The system is also used for: Obtain the operating load of the thermal power unit; Adjust the opening degree of the deaerator water regulating valve based on the operating load.

6. A method of operating an optimized back pressure heater train shaft seal cooling water system characterized by, The method is applied to a cascade heating back-pressure machine shaft seal cooling water system as described in any one of claims 1 to 5, and the method includes: Obtain the first operating power of the condensate pump of the thermal power unit when the back pressure machine is not running; The second operating power of the thermal power unit condensate pump is obtained when the back pressure machine is running and the at least one pipeline unit is closed. Obtain the third operating power of the shaft seal cooling water booster pump; The piping unit and the bypass unit are controlled based on the first operating power, the second operating power and the third operating power.

7. The method of claim 6, wherein, The control of the piping unit and the bypass unit based on the first operating power, the second operating power, and the third operating power includes: In response to the power difference between the first operating power and the second operating power being greater than the third operating power, the inlet valve, the cooling water booster pump, and the outlet valve of the first piping unit in the at least one piping unit are opened, and the inlet valves, the cooling water booster pump, and the outlet valves of the other piping units are closed, and the bypass valve in the bypass unit is closed; wherein, the first piping unit is any one of the at least one piping unit; or, In response to the power difference between the first operating power and the second operating power being less than or equal to the third operating power, the inlet valves, the cooling water booster pump, and the outlet valves in all the piping units are closed, and the bypass valve in the bypass unit is opened.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in claim 6 or 7.

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