A BEST small steam turbine self-starting control system

Abstract

The present application is about a BEST small steam turbine self-starting control system. The system optimizes and improves the control strategy of BEST self-starting through the first starting unit, the second starting unit, the third starting unit, the fourth starting unit, the fifth starting unit, the sixth starting unit, and the seventh starting unit, and completes the BEST small steam turbine self-starting in combination with the distributed control system. The present application can reduce the operating steps of the operator when using the DCS control system, effectively reducing the startup time and the workload of the operator's monitoring.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent control of ultra-supercritical double-reheat coal-fired units, and in particular to a BEST small steam turbine self-starting control system. Background Art

[0002] In the related technology, the BEST small steam turbine with small generator of the ultra-supercritical double reheat coal-fired unit has been applied in the field of thermal power generation. At present, the use of the BEST small steam turbine starting method to start the BEST small steam turbine with small generator has been put into practice and verified, and the actual operation steps are implemented through the analog circuit of the DCS (Distributed Control System) to realize the operation of the BEST small steam turbine self-starting control system based on the BEST small steam turbine starting method. Summary of the invention

[0003] To this end, the present application provides a BEST small steam turbine self-starting control system. The technical solution of the present application is as follows:

[0004] According to a first aspect of an embodiment of the present application, a BEST small steam turbine self-starting control system is provided, the system comprising:

[0005] The first starting unit is used to control the BEST small steam turbine to start in the BEST small steam turbine independent starting mode;

[0006] The second starting unit is used to determine whether the current starting mode of the BEST small steam turbine is the BEST small steam turbine independent starting mode, control the BEST small steam turbine to be released and put into operation according to the preset speed, control the speed of the BEST small steam turbine to increase to the second speed, and control the TAB setting value of the BEST small steam turbine to increase to 100%;

[0007] The third starting unit is used to control the steam source switching of the BEST small steam turbine, control the bypass valve of the BEST small steam turbine to enter the automatic mode, control the back pressure curve setting mode of the BEST small steam turbine to enter, and control the BEST small steam turbine to stop the speed release operation;

[0008] The fourth starting unit is used to control the closing of the regulating valve steam trap group of the BEST small steam turbine; wherein the regulating valve steam trap group includes the No. 1 regulating valve front steam trap, the No. 2 regulating valve front steam trap, the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine;

[0009] The fifth starting unit is used to control the input of No. 7 low-pressure heater;

[0010] The sixth starting unit is used to control the bypass valve of the BEST small steam turbine to be fully closed, and to control the bypass valve of the BEST small steam turbine to be switched from the automatic mode to the manual mode;

[0011] The seventh starting unit is used to control the input of No. 8 low-pressure heater, control the overflow valve of the BEST small steam turbine to be put into automatic mode, control the back pressure controller and the final stage pressure ratio control of the BEST small steam turbine to be put into automatic mode, control the high back pressure limit value setting of the BEST small steam turbine to be put into automatic mode, and complete the self-starting of the BEST small steam turbine.

[0012] According to one embodiment of the present application, the first starting unit includes a switch quantity input module for the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine being greater than the first temperature, a switch quantity input module for the axial displacement of the BEST small steam turbine being less than the first displacement distance, a switch quantity input module for the actual speed of the BEST small steam turbine being greater than the first speed, a switch quantity input module for the BEST small steam turbine starting mode, a first AND module, and a first completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein:

[0013] The switch quantity input module of the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, the switch quantity input module of the axial displacement of the BEST small steam turbine is less than the first displacement distance, the switch quantity input module of the actual speed of the BEST small steam turbine is greater than the first speed, and the switch quantity input module of the starting mode of the BEST small steam turbine are respectively connected to the input end of the first module;

[0014] The output end of the first AND module is connected to the first completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

[0015] According to one embodiment of the present application, the second starting unit includes a switch quantity input module for the actual speed of the BEST small steam turbine being greater than the second speed, a switch quantity input module for the TAB of the BEST small steam turbine rising to 99%, a second AND module, and a second completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein:

[0016] The switch input module whose actual speed of the BEST small steam turbine is greater than the second speed and the switch input module whose TAB of the BEST small steam turbine rises to 99% are respectively connected to the input end of the second AND module;

[0017] The output end of the second AND module is connected to the second completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

[0018] According to one embodiment of the present application, the third starting unit includes a switch quantity input module for fully opening the primary low-temperature reheat steam inlet valve, a switch quantity input module under the BEST small steam turbine starting mode, a switch quantity input module for the bypass quick closing solenoid valve of the BEST small steam turbine to lose power, a switch quantity input module for the bypass regulating valve of the BEST small steam turbine to be put into automatic mode, a switch quantity input module for the pressure ratio protection mode of the BEST small steam turbine, a third and module, a switch quantity input module for the bypass valve of the BEST small steam turbine to be in a fully closed state, a switch quantity input module for the No. 7 low-pressure steam inlet electric valve to be in an open state, a switch quantity input module for the primary low-temperature reheat steam inlet valve to be in a fully open state, a fourth and module, a first or module, and a third completion switch quantity output module for the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein,

[0019] The switch quantity input module for fully opening the primary low-temperature reheat steam inlet valve, the switch quantity input module in the BEST small steam turbine startup mode, the switch quantity input module for power failure of the bypass fast-closing solenoid valve of the BEST small steam turbine, the switch quantity input module for the bypass regulating valve of the BEST small steam turbine to be put into automatic mode, and the switch quantity input module for the pressure ratio protection mode of the BEST small steam turbine to be put into are respectively connected to the input end of the third module;

[0020] The switch quantity input module of the bypass valve of the BEST small steam turbine in the fully closed state, the switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state, and the switch quantity input module of the primary low-temperature reheat steam inlet valve in the fully open state are respectively connected to the input end of the fourth module;

[0021] The output end of the third AND module and the output end of the fourth AND module are respectively connected to the input end of the first OR module;

[0022] The output end of the first or module is connected to the third completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

[0023] According to one embodiment of the present application, the fourth starting unit includes a switch quantity input module in which the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are in a completely closed state, a switch quantity input module in which the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are in a completely closed state, a fifth and module, and a fourth completion switch quantity output module for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein,

[0024] The switch quantity input module of the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine in a fully closed state, and the switch quantity input module of the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine in a fully closed state are respectively connected to the input end of the fifth module;

[0025] The output end of the fifth AND module is connected to the fourth switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0026] According to one embodiment of the present application, the fifth starting unit includes a switch quantity input module of the No. 7 low-pressure steam inlet electric valve in an open state, a switch quantity input module of the BEST small steam turbine exhaust pressure less than 0.2MPa, a sixth and module, a switch quantity input module of the BEST small steam turbine bypass valve in a fully closed state, a seventh and module, a second or module, and a fifth completion switch quantity output module of the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein,

[0027] The switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state and the switch quantity input module of the BEST small steam turbine exhaust pressure less than 0.2MPa are respectively connected to the input end of the sixth module;

[0028] The switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state and the switch quantity input module of the BEST small steam turbine bypass valve in the fully closed state are respectively connected to the input end of the seventh module;

[0029] The output end of the sixth AND module and the output end of the seventh AND module are respectively connected to the input end of the second OR module;

[0030] The output end of the second or module is connected to the fifth completed switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

[0031] According to one embodiment of the present application, the sixth starting unit includes a switch quantity input module in which the bypass valve of the BEST small steam turbine is in a fully closed state, a switch quantity input module in which the bypass valve position control of the BEST small steam turbine is in manual mode, an eighth and module, and a sixth completion switch quantity output module for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein:

[0032] The switch quantity input module of the bypass valve of the BEST small steam turbine in the fully closed state and the switch quantity input module of the bypass valve position control of the BEST small steam turbine in the manual mode are respectively connected to the input end of the eighth module;

[0033] The output end of the eighth AND module is connected to the sixth switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0034] According to one embodiment of the present application, the seventh starting unit includes a switch quantity input module for the valve position control of the BEST small steam turbine overflow valve in the automatic mode, a switch quantity input module for the BEST small steam turbine in the master control state mode under the BEST small steam turbine startup, a ninth and module, and a seventh completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine startup mode, wherein,

[0035] The switch quantity input module of the valve position control of the BEST small steam turbine overflow valve in automatic mode and the switch quantity input module of the BEST small steam turbine in the master control state mode under the start-up of the BEST small steam turbine are respectively connected to the input end of the ninth module;

[0036] The output end of the ninth AND module is connected to the seventh switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0037] According to one embodiment of the present application, the first temperature is 160° C., the first displacement distance is 0.9 mm, the first rotation speed is 999 r / min, and the second rotation speed is 2440 r / min.

[0038] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0039] By respectively determining whether the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, whether the axial displacement of the BEST small steam turbine is less than the first displacement distance, and whether the actual speed of the BEST small steam turbine is greater than the first speed, the starting mode of the BEST small steam turbine is determined; determining whether the current starting mode of the BEST small steam turbine is the independent starting mode of the BEST small steam turbine, controlling the BEST small steam turbine to be released and put into operation according to the preset speed, controlling the speed of the BEST small steam turbine to rise to the second speed, and controlling the TAB setting value of the BEST small steam turbine to rise to 100%; controlling the steam source switching of the BEST small steam turbine, and controlling the bypass of the BEST small steam turbine The valve is put into automatic mode, the back pressure curve setting mode of the BEST small steam turbine is controlled to be put into automatic mode, and the BEST small steam turbine is controlled to stop the speed release operation; the regulating valve steam trap group of the BEST small steam turbine is closed; the No. 7 low-pressure heater is controlled to be put into operation; the bypass valve of the BEST small steam turbine is controlled to be fully closed, and the bypass valve of the BEST small steam turbine is controlled from the automatic mode to the manual mode; the No. 8 low-pressure heater is controlled to be put into operation, and the overflow valve of the BEST small steam turbine is controlled to be put into automatic mode, and the back pressure controller and the final stage pressure ratio control of the BEST small steam turbine are controlled to be put into automatic mode respectively, and the high back pressure limit value setting of the BEST small steam turbine is controlled to be put into automatic mode, and the BEST small steam turbine is completed. The system can reduce the operating steps of operators when using the DCS control system. Compared with the previous manual start-up of related systems and equipment that consumes a lot of time, it has the advantages of reducing the start-up time and the workload of operators monitoring the panel.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0042] Figure 1 This is a structural block diagram of a BEST small steam turbine self-starting control system in an embodiment of the present application;

[0043] Figure 2 is a structural schematic diagram of a first starting unit in an embodiment of the present application;

[0044] Figure 3 is a structural schematic diagram of a second starting unit in an embodiment of the present application;

[0045] Figure 4 is a structural schematic diagram of a third starting unit in an embodiment of the present application;

[0046] Figure 5is a structural schematic diagram of a fourth starting unit in an embodiment of the present application;

[0047] Figure 6 is a structural schematic diagram of a fifth starting unit in an embodiment of the present application;

[0048] Figure 7 is a structural schematic diagram of a sixth starting unit in an embodiment of the present application;

[0049] Figure 8 is a structural schematic diagram of a seventh starting unit in an embodiment of the present application;

[0050] Fig. 9 This is a schematic diagram of the structure of the BEST small steam turbine driving the generator in the embodiment of the present application.

[0051] Reference numerals

[0052] 1. Main steam valve No. 1; 2. Main steam valve No. 2; 3. Main steam regulating valve No. 1; 4. Main steam regulating valve No. 2; 5. Electric steam extraction valve No. 2; 6. Electric steam extraction valve No. 3; 7. Electric steam extraction valve No. 4; 8. Electric steam extraction valve No. 5; 9. Electric steam extraction valve No. 6; 10. Check valve No. 7; 11. Electric steam extraction valve No. 7; 12. Exhaust header; 13. Overflow valve pipeline stop valve; 14. Bypass valve; 15. Overflow valve; 16. Steam supplement valve; 17. BEST small steam turbine; 18. Generator; 19. Converter. DETAILED DESCRIPTION

[0053] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0055] It should be noted that in the related technology, the BEST small steam turbine with small generator of the ultra-supercritical double reheat coal-fired unit has been applied in the field of thermal power generation. At present, the use of the BEST small steam turbine starting method to start the BEST small steam turbine to drive the small generator has been put into practice and verified, and the actual operation steps are implemented through the analog circuit of the DCS (Distributed Control System) to realize the operation of the BEST small steam turbine self-starting control system based on the BEST small steam turbine starting method.

[0056] Based on the above problems, the present application proposes a BEST small steam turbine self-starting control system, which can determine the starting mode of the BEST small steam turbine by respectively determining whether the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, whether the axial displacement of the BEST small steam turbine is less than the first displacement distance, and whether the actual speed of the BEST small steam turbine is greater than the first speed; determine whether the current starting mode of the BEST small steam turbine is the BEST small steam turbine independent starting mode, control the BEST small steam turbine to release and put into operation according to the preset speed, control the speed of the BEST small steam turbine to increase to the second speed, and control the TAB setting value of the BEST small steam turbine to increase to 100%; control the BEST small steam turbine Steam source switching, control the bypass valve of BEST small steam turbine to enter automatic mode, control the back pressure curve setting mode of BEST small steam turbine to enter, control the BEST small steam turbine to stop speed release operation; control the regulating valve steam trap group of BEST small steam turbine to close; control the No. 7 low-pressure heater to enter; control the bypass valve of BEST small steam turbine to close completely, control the bypass valve of BEST small steam turbine from automatic mode to manual mode; control the No. 8 low-pressure heater to enter, control the overflow valve of BEST small steam turbine to enter automatic mode, control the back pressure controller and the final stage pressure ratio control of BEST small steam turbine to enter automatic mode respectively, control the high back pressure limit value setting of BEST small steam turbine to enter automatic mode, and complete the self-start of BEST small steam turbine. This system can reduce the operation steps of operators when using DCS control system. Compared with the previous manual start of related systems and equipment, which consumes a lot of time, it can effectively reduce the start-up time and the workload of operators.

[0057] It should be noted that if Fig. 9As shown, the BEST small steam turbine 17 is connected to the generator 18 through a transmission shaft, the generator 18 is connected to the converter 19, and the BEST small steam turbine 17 is connected to the steam source through two steam input pipelines, one of which is equipped with a No. 1 main steam valve 1 and a No. 1 main steam regulating valve 3, and the other steam input pipeline is equipped with a No. 2 main steam valve 2 and a No. 2 main steam regulating valve 4. The No. 7 extraction steam outlet of the BEST small steam turbine 17 is connected to the No. 7 extraction check valve 10, the No. 7 extraction steam electric valve 11 and the exhaust steam header 12 in sequence through pipelines. The exhaust steam header 12 is connected to the steam source, the condenser, the No. 8 low-pressure heater and the No. 7 low-pressure heater through pipelines respectively. The pipeline between the exhaust steam header 12 and the No. 8 low-pressure heater is connected with the overflow valve 15, the pipeline stop valve 13 and the overflow valve 15, the pipeline between the exhaust steam header 12 and the condenser is connected with the bypass valve 14, and the pipeline between the exhaust steam header 12 and the steam source is connected with the supplementary steam valve 16. The extraction steam pipelines of the No. 2 extraction steam outlet, the No. 3 extraction steam outlet, the No. 4 extraction steam outlet, the No. 5 extraction steam outlet and the No. 6 extraction steam outlet of the BEST small steam turbine 17 are respectively installed with the No. 2 main steam regulating valve 4, the No. 3 extraction steam electric valve 6, the No. 4 extraction steam electric valve 7, the No. 5 extraction steam electric valve 8 and the No. 6 extraction steam electric valve 9.

[0058] Figure 1 This is a structural block diagram of a BEST small steam turbine self-starting control system in an embodiment of the present application.

[0059] like Figure 1 As shown, the BEST small steam turbine self-starting control system includes a first starting unit 101, a second starting unit 102, a third starting unit 103, a fourth starting unit 104, a fifth starting unit 105, a sixth starting unit 106, and a seventh starting unit 107.

[0060] Wherein, the first starting unit 101 is used to control the BEST small steam turbine to start in a BEST small steam turbine independent starting mode;

[0061] The second starting unit 102 is used to determine whether the current starting mode of the BEST small steam turbine is the BEST small steam turbine independent starting mode, control the BEST small steam turbine to be released and put into operation according to the preset speed, control the speed of the BEST small steam turbine to increase to the second speed of 2440r / min, and control the TAB setting value of the BEST small steam turbine to increase to 100%;

[0062] The third starting unit 103 is used to control the steam source switching of the BEST small steam turbine, control the bypass valve of the BEST small steam turbine to enter the automatic mode, control the back pressure curve setting mode of the BEST small steam turbine to enter, and control the BEST small steam turbine to stop the speed release operation;

[0063] The fourth start-up unit 104 is used to control the closing of the regulating valve trap group of the BEST small steam turbine; wherein the regulating valve trap group includes the No. 1 regulating valve front trap, the No. 2 regulating valve front trap, the No. 1 regulating valve rear trap and the No. 2 regulating valve rear trap of the BEST small steam turbine;

[0064] It should be noted that the steam trap before No. 1 regulating valve and the steam trap after No. 1 regulating valve are both set corresponding to the No. 1 main steam regulating valve 3, and the steam trap before No. 2 regulating valve and the steam trap after No. 2 regulating valve are both set corresponding to the No. 2 main steam regulating valve 4. When the temperature in the pipeline is too high, the steam trap before No. 1 regulating valve, the steam trap after No. 1 regulating valve, the steam trap before No. 2 regulating valve and the steam trap after No. 2 regulating valve can be used for cooling.

[0065] The fifth starting unit 105 is used to control the No. 7 low-pressure heater to be put into operation;

[0066] The sixth starting unit 106 is used to control the bypass valve of the BEST small steam turbine to be fully closed, and control the bypass valve of the BEST small steam turbine to be switched from the automatic mode to the manual mode;

[0067] The seventh starting unit 107 is used to control the input of the No. 8 low-pressure heater, control the overflow valve of the BEST small steam turbine to be put into automatic mode, control the back pressure controller and the final stage pressure ratio control of the BEST small steam turbine to be put into automatic mode, control the high back pressure limit value setting of the BEST small steam turbine to be put into automatic mode, and complete the self-starting of the BEST small steam turbine.

[0068] It should be noted that the above automatic mode refers to automatically executing corresponding operations according to a preset PID value through a PID automatic adjustment module.

[0069] Optionally, the first starting unit 101 , the second starting unit 102 , the third starting unit 103 , the fourth starting unit 104 , the fifth starting unit 105 , the sixth starting unit 106 , and the seventh starting unit 107 may all perform corresponding control operations through a DCS (Distributed Control System).

[0070] In some embodiments of the present application, Figure 2As shown, the first starting unit 101 includes a switch quantity input module 201 for the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine being greater than the first temperature, a switch quantity input module 202 for the axial displacement of the BEST small steam turbine being less than the first displacement distance, a switch quantity input module 203 for the actual speed of the BEST small steam turbine being greater than the first speed, a switch quantity input module 204 for the starting mode of the BEST small steam turbine, a first and module 205, and a first completed switch quantity output module 206 for the self-starting of the BEST small steam turbine based on the starting mode of the BEST small steam turbine, wherein, The switch quantity input module 201 for the metal temperature of the inner wall of the inner cylinder of the ST small steam turbine being greater than the first temperature, the switch quantity input module 202 for the axial displacement of the BEST small steam turbine being less than the first displacement distance, the switch quantity input module 2033 for the actual speed of the BEST small steam turbine being greater than the first speed, and the switch quantity input module 204 for the starting mode of the BEST small steam turbine are respectively connected to the input end of the first AND module 205; the output end of the first AND module 205 is connected to the first completed switch quantity output module 206 for the self-starting of the BEST small steam turbine based on the starting mode of the BEST small steam turbine.

[0071] That is to say, when the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, the output signal of the switch quantity input module 201 whose metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature is 1; when the axial displacement of the BEST small steam turbine is less than the first displacement distance, the output signal of the switch quantity input module 202 whose axial displacement of the BEST small steam turbine is less than the first displacement distance is 1; when the actual speed of the BEST small steam turbine is greater than the first speed, the output signal of the switch quantity input module 203 whose actual speed of the BEST small steam turbine is greater than the first speed is 1; when the current starting mode is the BEST small steam turbine starting mode, the output signal of the switch quantity input module 204 of the BEST small steam turbine starting mode is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the first and module 205 is 0, and the first starting unit 101 is re-controlled to adjust and process the module whose output switch quantity signal is 0, until the output signal of the first and module 205 is 1.

[0072] As an example of possible implementation, after the first completion switch output module 206 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the first and module 205, the first completion switch output module 206 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the second starting unit 102, and the second starting unit 102 executes the operation to be executed of this unit after receiving the above-mentioned current task completion signal.

[0073] In some embodiments of the present application, Figure 3As shown, the second starting unit 102 includes a switch quantity input module 301 for the actual speed of the BEST small steam turbine being greater than the second speed, a switch quantity input module 302 for the TAB of the BEST small steam turbine being increased to 99%, a second AND module 303, and a second completed switch quantity output module 304 for the self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein the switch quantity input module 301 for the actual speed of the BEST small steam turbine being greater than the second speed and the switch quantity input module 302 for the TAB of the BEST small steam turbine being increased to 99% are respectively connected to the input end of the second AND module 303; and the output end of the second AND module 303 is connected to the second completed switch quantity output module 304 for the self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0074] That is to say, when the actual speed of the BEST small steam turbine is greater than the second speed, the output signal of the switch input module 301 of the actual speed of the BEST small steam turbine is greater than the second speed is 1; when the TAB of the BEST small steam turbine rises to 99%, the output signal of the switch input module 302 of the TAB of the BEST small steam turbine rises to 99% is 1. If the switch signal output by any of the above modules is 0, the output signal of the second AND module 303 is 0, and the second start unit 102 is re-controlled to adjust and process the module whose output switch signal is 0 until the output signal of the second AND module 303 is 1.

[0075] As an example of possible implementation, after the second completion switch output module 304 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the second AND module 303, the second completion switch output module 304 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the third starting unit 103, and the third starting unit 103 executes the operation to be executed of this unit after receiving the above-mentioned current task completion signal.

[0076] In some embodiments of the present application, Figure 4As shown, the third startup unit 103 includes a switch quantity input module 401 for fully opening the primary low-temperature reheat steam inlet valve, a switch quantity input module 402 for the BEST small steam turbine startup mode, a switch quantity input module 403 for de-energizing the bypass fast-closing solenoid valve of the BEST small steam turbine, a switch quantity input module 404 for putting the bypass regulating valve of the BEST small steam turbine into automatic mode, a switch quantity input module 405 for putting the pressure ratio protection mode of the BEST small steam turbine into operation, a third AND module 410, and a switch quantity input module 406 for putting the BEST small steam turbine into operation. The switch quantity input module 406 of the bypass valve of the steam turbine is in a fully closed state, the switch quantity input module 407 of the No. 7 low-pressure steam inlet electric valve is in an open state, the switch quantity input module 408 of the primary low-temperature reheat steam inlet valve is in a fully open state, the fourth and module 411, the first or module 412 and the third complete switch quantity output module 409 of the BEST small steam turbine self-start based on the BEST small steam turbine start-up mode, wherein the switch quantity input module 401 of the primary low-temperature reheat steam inlet valve is fully opened , the switch quantity input module 402 under the BEST small steam turbine starting mode, the switch quantity input module 403 of the bypass fast closing solenoid valve of the BEST small steam turbine losing power, the switch quantity input module 404 of the bypass regulating valve of the BEST small steam turbine being put into automatic mode, and the switch quantity input module 405 of the pressure ratio protection mode of the BEST small steam turbine are respectively connected to the input end of the third AND module 410; the switch quantity input module 406 of the bypass valve of the BEST small steam turbine in a fully closed state, the switch quantity input module 407 of the No. 7 low-pressure steam inlet electric valve in an open state, and the switch quantity input module 408 of the primary low-temperature reheat steam inlet valve in a fully open state are respectively connected to the input end of the fourth AND module 411; the output end of the third AND module 410 and the output end of the fourth AND module 411 are respectively connected to the input end of the first OR module 412; the output end of the first OR module 412 is connected to the third completed switch quantity output module 409 of the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode.

[0077] That is to say, the output signal of the switch quantity input module 401 when the primary low-temperature reheat steam inlet valve is fully opened is 1; when the current startup mode is the BEST small steam turbine startup mode, the output signal of the switch quantity input module 402 under the BEST small steam turbine startup mode is 1; when the bypass fast closing solenoid valve of the BEST small steam turbine loses power, the output signal of the switch quantity input module 403 when the bypass fast closing solenoid valve of the BEST small steam turbine loses power is 1; when the bypass regulating valve of the BEST small steam turbine is put into automatic mode, the output signal of the switch quantity input module 404 when the bypass regulating valve of the BEST small steam turbine is put into automatic mode is 1; when the pressure ratio protection mode of the BEST small steam turbine is put into operation, the output signal of the switch quantity input module 405 when the pressure ratio protection mode of the BEST small steam turbine is put into operation is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the third AND module 410 is 0.

[0078] When the bypass valve of the BEST small steam turbine is in a fully closed state, the output signal of the switch quantity input module 406 of the bypass valve of the BEST small steam turbine is 1; when the No. 7 low-pressure steam inlet electric valve is in an open state, the output signal of the switch quantity input module 407 of the No. 7 low-pressure steam inlet electric valve is 1; when the primary low-temperature reheat steam inlet valve is in a fully open state, the output signal of the switch quantity input module 408 of the primary low-temperature reheat steam inlet valve is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the fourth AND module 411 is 0.

[0079] If the output signal of the third AND module 410 or the fourth AND module 411 is 1, the output signal of the first OR module 412 is 1. If the output signals of the third AND module 410 and the fourth AND module 411 are both 0, the output signal of the first OR module 412 is 0, and the third start unit 103 is re-controlled to adjust and process the module whose output switch signal is 0 until the output signal of the first OR module 412 is 1.

[0080] As an example of possible implementation, after the third completion switch output module 409 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the first or module 412, the third completion switch output module 409 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the fourth starting unit 104, and the fourth starting unit 104 executes the to-be-executed operation of this unit after receiving the above-mentioned current task completion signal.

[0081] In some embodiments of the present application, Figure 5As shown, the fourth starting unit 104 includes a switch quantity input module 501 in which the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are in a completely closed state, a switch quantity input module 502 in which the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are in a completely closed state, a fifth AND module 503 and a fourth completed switch quantity output module 504 for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein the switch quantity input module 501 in which the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are in a completely closed state, and the switch quantity input module 502 in which the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are in a completely closed state are respectively connected to the input end of the fifth AND module 503; the output end of the fifth AND module 503 is connected to the fourth completed switch quantity output module 504 for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0082] That is to say, when the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are in a fully closed state, the output signal of the switch quantity input module 501 of the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are in a fully closed state is 1; when the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are in a fully closed state, the output signal of the switch quantity input module 502 of the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are in a fully closed state is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the fifth and module 503 is 0, and the fourth startup unit 104 is re-controlled to adjust and process the module whose output switch quantity signal is 0 until the output signal of the fifth and module 503 is 1.

[0083] As an example of possible implementation, after the fourth completion switch output module 504 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the fifth and module 503, the fourth completion switch output module 504 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the fifth starting unit 105, and the fifth starting unit 105 executes the to-be-executed operation of this unit after receiving the above-mentioned current task completion signal.

[0084] In some embodiments of the present application, Figure 6As shown, the fifth starting unit 105 includes a switch quantity input module 601 of the No. 7 low-pressure steam inlet electric valve in an open state, a switch quantity input module 602 of the BEST small steam turbine exhaust pressure less than 0.2MPa, a sixth and module 605, a switch quantity input module 603 of the BEST small steam turbine bypass valve in a fully closed state, a seventh and module 606, a second or module 607, and a fifth completion switch quantity output module 604 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode, wherein the switch quantity input module 601 of the No. 7 low-pressure steam inlet electric valve in an open state, the BEST small steam turbine exhaust pressure less than 0.2MPa, the sixth and module 605, the switch quantity input module 603 of the BEST small steam turbine bypass valve in a fully closed state, the seventh and module 606, the second or module 607, and the BEST small steam turbine self-start based on the BEST small steam turbine starting mode. The switch quantity input module 602 with a pressure less than 0.2MPa is respectively connected to the input end of the sixth AND module 605; the switch quantity input module 601 of the No. 7 low-pressure steam inlet electric valve in the open state and the switch quantity input module 603 of the BEST small steam turbine bypass valve in the fully closed state are respectively connected to the input end of the seventh AND module 606; the output end of the sixth AND module 605 and the output end of the seventh AND module 606 are respectively connected to the input end of the second OR module 607; the output end of the second OR module 607 is connected to the fifth completed switch quantity output module 604 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

[0085] That is to say, when the No. 7 low-pressure steam inlet electric valve is in the open state, the output signal of the switch quantity input module 601 of the No. 7 low-pressure steam inlet electric valve is in the open state is 1; when the exhaust pressure of the BEST small steam turbine is less than 0.2MPa, the output signal of the switch quantity input module 602 of the BEST small steam turbine exhaust pressure is less than 0.2MPa is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the sixth and module 605 is 0.

[0086] When the No. 7 low-pressure steam inlet electric valve is in the open state, the output signal of the switch quantity input module 601 of the No. 7 low-pressure steam inlet electric valve in the open state is 1; when the BEST small steam turbine bypass valve is in the fully closed state, the output signal of the switch quantity input module 603 of the BEST small steam turbine bypass valve in the fully closed state is 1. If the switch quantity signal output by any of the above modules is 0, the output signal of the seventh and module 606 is 0.

[0087] If the output signal of the sixth AND module 605 or the seventh AND module 606 is 1, the output signal of the second OR module 607 is 1. If the output signals of the sixth AND module 605 and the seventh AND module 606 are both 0, the output signal of the second OR module 607 is 0, and the fifth starting unit 105 is controlled again to adjust and process the module whose output switch signal is 0 until the output signal of the second OR module 607 is 1.

[0088] As an example of possible implementation, after the fifth completion switch output module 604 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the second or module 607, the fifth completion switch output module 604 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the sixth starting unit 106, and the sixth starting unit 106 executes the to-be-executed operation of this unit after receiving the above-mentioned current task completion signal.

[0089] In some embodiments of the present application, Figure 7 As shown, the sixth starting unit 106 includes a switch quantity input module 701 in which the bypass valve of the BEST small steam turbine is in a fully closed state, a switch quantity input module 702 in which the bypass valve position control of the BEST small steam turbine is in a manual mode, an eighth AND module 703, and a sixth completed switch quantity output module 704 for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein the switch quantity input module 701 in which the bypass valve of the BEST small steam turbine is in a fully closed state and the switch quantity input module 702 in which the bypass valve position control of the BEST small steam turbine is in a manual mode are respectively connected to the input end of the eighth AND module 703; and the output end of the eighth AND module 703 is connected to the sixth completed switch quantity output module 704 for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode.

[0090] That is to say, when the bypass valve of the BEST small steam turbine is in the fully closed state, the output signal of the switch input module 701 of the bypass valve of the BEST small steam turbine is 1; when the bypass valve position control of the BEST small steam turbine is in the manual mode, the output signal of the switch input module 702 of the bypass valve position control of the BEST small steam turbine in the manual mode is 1. If the switch signal output by any of the above modules is 0, the output signal of the eighth and module 703 is 0, and the sixth start-up unit 106 is re-controlled to adjust and process the module whose output switch signal is 0, until the output signal of the eighth and module 703 is 1.

[0091] As an example of possible implementation, after the sixth completion switch output module 704 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode receives the output signal 1 of the eighth and module 703, the sixth completion switch output module 704 of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode sends the current task completion signal to the seventh starting unit 107, and the seventh starting unit 107 executes the to-be-executed operation of this unit after receiving the above-mentioned current task completion signal.

[0092] In some embodiments of the present application, Figure 8As shown, the seventh starting unit 107 includes a switch quantity input module 801 for automatic mode control of the valve position control of the BEST small steam turbine overflow valve, a switch quantity input module 802 of the BEST small steam turbine in the main control state mode under the BEST small steam turbine start-up, a ninth AND module 803 and a seventh completed switch quantity output module 804 for self-starting of the BEST small steam turbine based on the BEST small steam turbine start-up mode, wherein the switch quantity input module 801 for automatic mode control of the valve position control of the BEST small steam turbine overflow valve and the switch quantity input module 802 of the BEST small steam turbine in the main control state mode under the BEST small steam turbine start-up are respectively connected to the input end of the ninth AND module 803; the output end of the ninth AND module 803 is connected to the seventh completed switch quantity output module 804 for self-starting of the BEST small steam turbine based on the BEST small steam turbine start-up mode.

[0093] That is to say, when the valve position control of the BEST small steam turbine overflow valve is put into automatic mode, the output signal of the switch input module 801 of the BEST small steam turbine overflow valve is 1; when the BEST small steam turbine is in the main control state mode under the BEST small steam turbine startup, the output signal of the switch input module 802 of the BEST small steam turbine in the main control state mode under the BEST small steam turbine startup is 1. If the switch signal output by any of the above modules is 0, the output signal of the first and module 803 is 0, and the eighth startup unit 108 is re-controlled to adjust and process the module whose output switch signal is 0, until the output signal of the first and module 803 is 1. At this time, the self-start of the BEST small steam turbine is completed.

[0094] In some embodiments of the present application, the first temperature is 160° C., the first displacement distance is 0.9 mm, the first rotation speed is 999 r / min, and the second rotation speed is 2440 r / min.

[0095] According to a BEST small steam turbine self-starting control system of an embodiment of the present application, the starting mode of the BEST small steam turbine is determined by respectively determining whether the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, whether the axial displacement of the BEST small steam turbine is less than the first displacement distance, and whether the actual speed of the BEST small steam turbine is greater than the first speed; determining whether the current starting mode of the BEST small steam turbine is the BEST small steam turbine independent starting mode, controlling the BEST small steam turbine to release and put into operation according to the preset speed, controlling the speed of the BEST small steam turbine to increase to the second speed, and controlling the TAB setting value of the BEST small steam turbine to increase to 100%; controlling the steam source switching of the BEST small steam turbine , control the bypass valve of BEST small steam turbine to enter automatic mode, control the back pressure curve setting mode of BEST small steam turbine to enter automatic mode, control the BEST small steam turbine to stop speed release operation; control the regulating valve steam trap group of BEST small steam turbine to close; control the No. 7 low-pressure heater to enter; control the bypass valve of BEST small steam turbine to close completely, control the bypass valve of BEST small steam turbine from automatic mode to manual mode; control the No. 8 low-pressure heater to enter, control the overflow valve of BEST small steam turbine to enter automatic mode, control the back pressure controller and the final stage pressure ratio control of BEST small steam turbine to enter automatic mode respectively, control the high back pressure limit value setting of BEST small steam turbine to enter automatic mode, and complete the self-start of BEST small steam turbine. This system can reduce the operating steps of operators when using DCS control system. Compared with the previous manual start of related systems and equipment, which consumes a lot of time, it can effectively reduce the start-up time and the workload of operators.

[0096] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0100] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0101] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A BEST small steam turbine self-starting control system, characterized in that: The system comprises: The first starting unit is used to control the BEST small steam turbine to start in the BEST small steam turbine independent starting mode; The second starting unit is used to determine whether the current starting mode of the BEST small steam turbine is the BEST small steam turbine independent starting mode, control the BEST small steam turbine to be released and put into operation according to the preset speed, control the speed of the BEST small steam turbine to increase to the second speed, and control the turbine starting of the BEST small steam turbine and the lift limiter TAB setting value to increase to 100%; The third starting unit is used to control the steam source switching of the BEST small steam turbine, control the bypass valve of the BEST small steam turbine to enter the automatic mode, control the back pressure curve setting mode of the BEST small steam turbine to enter, and control the BEST small steam turbine to stop the speed release operation; The fourth starting unit is used to control the closing of the regulating valve steam trap group of the BEST small steam turbine; wherein the regulating valve steam trap group includes the No. 1 regulating valve front steam trap, the No. 2 regulating valve front steam trap, the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine; The fifth starting unit is used to control the input of No. 7 low-pressure heater; The sixth starting unit is used to control the bypass valve of the BEST small steam turbine to be fully closed, and to control the bypass valve of the BEST small steam turbine to be switched from the automatic mode to the manual mode; The seventh starting unit is used to control the input of No. 8 low-pressure heater, control the overflow valve of the BEST small steam turbine to be put into automatic mode, control the back pressure controller and the final stage pressure ratio control of the BEST small steam turbine to be put into automatic mode, control the high back pressure limit value setting of the BEST small steam turbine to be put into automatic mode, and complete the self-starting of the BEST small steam turbine.

2. The system according to claim 1, characterized in that The first starting unit includes a switch quantity input module for the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine being greater than the first temperature, a switch quantity input module for the axial displacement of the BEST small steam turbine being less than the first displacement distance, a switch quantity input module for the actual speed of the BEST small steam turbine being greater than the first speed, a switch quantity input module for the BEST small steam turbine starting mode, a first AND module, and a first completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein: The switch quantity input module of the metal temperature of the inner wall of the inner cylinder of the BEST small steam turbine is greater than the first temperature, the switch quantity input module of the axial displacement of the BEST small steam turbine is less than the first displacement distance, the switch quantity input module of the actual speed of the BEST small steam turbine is greater than the first speed, and the switch quantity input module of the starting mode of the BEST small steam turbine are respectively connected to the input end of the first module; The output end of the first AND module is connected to the first completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

3. The system according to claim 1, characterized in that The second starting unit includes a switch quantity input module for the actual speed of the BEST small steam turbine being greater than the second speed, a switch quantity input module for the TAB of the BEST small steam turbine rising to 99%, a second AND module, and a second completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein: The switch input module whose actual speed of the BEST small steam turbine is greater than the second speed and the switch input module whose TAB of the BEST small steam turbine rises to 99% are respectively connected to the input end of the second AND module; The output end of the second AND module is connected to the second completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

4. The system according to claim 1, characterized in that The third startup unit includes a switch quantity input module for fully opening the primary low-temperature reheat steam inlet valve, a switch quantity input module under the BEST small steam turbine startup mode, a switch quantity input module for power failure of the bypass quick-closing solenoid valve of the BEST small steam turbine, a switch quantity input module for the bypass regulating valve of the BEST small steam turbine to be put into automatic mode, a switch quantity input module for the pressure ratio protection mode of the BEST small steam turbine, a third and module, a switch quantity input module for the bypass valve of the BEST small steam turbine to be in a fully closed state, a switch quantity input module for the No. 7 low-pressure steam inlet electric valve to be in an open state, a switch quantity input module for fully opening the primary low-temperature reheat steam inlet valve, a fourth and module, a first or module, and a third completion switch quantity output module for the self-start of the BEST small steam turbine based on the BEST small steam turbine startup mode, wherein, The switch quantity input module for fully opening the primary low-temperature reheat steam inlet valve, the switch quantity input module in the BEST small steam turbine startup mode, the switch quantity input module for power failure of the bypass fast-closing solenoid valve of the BEST small steam turbine, the switch quantity input module for the bypass regulating valve of the BEST small steam turbine to be put into automatic mode, and the switch quantity input module for the pressure ratio protection mode of the BEST small steam turbine to be put into are respectively connected to the input end of the third module; The switch quantity input module of the bypass valve of the BEST small steam turbine in the fully closed state, the switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state, and the switch quantity input module of the primary low-temperature reheat steam inlet valve in the fully open state are respectively connected to the input end of the fourth module; The output end of the third AND module and the output end of the fourth AND module are respectively connected to the input end of the first OR module; The output end of the first or module is connected to the third completion switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

5. The system according to claim 1, characterized in that The fourth starting unit includes a switch quantity input module in which the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine are all in a closed state, a switch quantity input module in which the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine are all in a closed state, a fifth and module, and a fourth complete switch quantity output module for self-starting of the BEST small steam turbine based on the BEST small steam turbine starting mode, wherein, The switch quantity input module of the No. 1 regulating valve front steam trap and the No. 2 regulating valve front steam trap of the BEST small steam turbine in a fully closed state, and the switch quantity input module of the No. 1 regulating valve rear steam trap and the No. 2 regulating valve rear steam trap of the BEST small steam turbine in a fully closed state are respectively connected to the input end of the fifth module; The output end of the fifth AND module is connected to the fourth switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

6. The system according to claim 1, characterized in that The fifth starting unit includes a switch quantity input module for the No. 7 low-pressure steam inlet electric valve in an open state, a switch quantity input module for the BEST small steam turbine exhaust pressure less than 0.2MPa, a sixth and module, a switch quantity input module for the BEST small steam turbine bypass valve in a fully closed state, a seventh and module, a second or module, and a fifth complete switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein: The switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state and the switch quantity input module of the BEST small steam turbine exhaust pressure less than 0.2MPa are respectively connected to the input end of the sixth module; The switch quantity input module of the No. 7 low-pressure steam inlet electric valve in the open state and the switch quantity input module of the BEST small steam turbine bypass valve in the fully closed state are respectively connected to the input end of the seventh module; The output end of the sixth AND module and the output end of the seventh AND module are respectively connected to the input end of the second OR module; The output end of the second or module is connected to the fifth completed switch output module of the BEST small steam turbine self-start based on the BEST small steam turbine starting mode.

7. The system according to claim 1, characterized in that The sixth starting unit includes a switch quantity input module for the bypass valve of the BEST small steam turbine in a fully closed state, a switch quantity input module for the bypass valve position control of the BEST small steam turbine in a manual mode, an eighth AND module, and a sixth completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine starting mode, wherein: The switch quantity input module of the bypass valve of the BEST small steam turbine in the fully closed state and the switch quantity input module of the bypass valve position control of the BEST small steam turbine in the manual mode are respectively connected to the input end of the eighth module; The output end of the eighth AND module is connected to the sixth switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

8. The system according to claim 1, characterized in that The seventh startup unit includes a switch quantity input module for the valve position control of the BEST small steam turbine overflow valve in the automatic mode, a switch quantity input module for the BEST small steam turbine in the master control state mode under the BEST small steam turbine startup, a ninth and module, and a seventh completion switch quantity output module for the BEST small steam turbine self-starting based on the BEST small steam turbine startup mode, wherein, The switch quantity input module of the valve position control of the BEST small steam turbine overflow valve in automatic mode and the switch quantity input module of the BEST small steam turbine in the master control state mode under the start-up of the BEST small steam turbine are respectively connected to the input end of the ninth module; The output end of the ninth AND module is connected to the seventh switching value output module for completing the self-start of the BEST small steam turbine based on the BEST small steam turbine starting mode.

9. The system according to claim 2, characterized in that The first temperature is 160° C., the first displacement distance is 0.9 mm, the first rotation speed is 999 r / min, and the second rotation speed is 2440 r / min.

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