Automatic Regulation and Control System of Supplementary Steam Valve of BEST Small Steam Turbine

Abstract

The present application proposes an automatic regulating control system for a BEST small steam turbine supplementary steam valve, which includes: an analog quantity hand-operated unit, an operating state identification unit, an automatic instruction output unit, a switch quantity signal input unit for the instruction of the eighth step of the BEST small steam turbine startup sequence control, a tracking state identification unit and an analog quantity signal output unit for the valve position instruction of the BEST small steam turbine bypass valve, so as to realize automatic control of the opening and closing of the supplementary steam valve according to different operating conditions. The system can be fully applicable to equipment with a small generator of a BEST small steam turbine, which can not only ensure the safe, stable and efficient operation of the BEST small steam turbine, but also achieve the effect of reducing staff and increasing efficiency.

Description

Technical Field

[0001] The present application relates to the field of intelligent control of a BEST small steam turbine with a small generator in an ultra-supercritical double reheat coal-fired unit, and in particular to an automatic regulating control system for a BEST small steam turbine supplementary steam valve. Background Art

[0002] With the rapid development of my country's power industry, the ultra-supercritical double reheat coal-fired unit BEST small steam turbine with small generator, as a new and important equipment in the power plant, plays a vital role in power production. During the start-up sequence of the BEST small steam turbine, if the adjustment control of the steam supply valve fails, it will cause insufficient steam supply to the BEST small steam turbine, seriously affecting the normal start-up of the BEST small steam turbine. Because each step of the BEST small steam turbine start-up sequence is set with a corresponding step time, if the steam supply valve fails for a long time and the steam supply is insufficient, it will cause the preset step time to be exceeded, and finally cause the start-up sequence of the BEST small steam turbine to fail, seriously delaying the start-up plan of the unit and failing to generate electricity and connect to the grid in time, which will affect the economy and safety of the unit.

[0003] Therefore, considering the unique operating characteristics of the BEST small steam turbine with a small generator, designing an automatic regulation and control system for the BEST small steam turbine supplementary steam valve has become an urgent problem to be solved. Summary of the invention

[0004] In order to solve the above problems, the present application provides an automatic regulation and control system for a BEST small steam turbine supplementary steam valve.

[0005] According to one aspect of the present application, an automatic regulating control system for a BEST small steam turbine supplementary steam valve is provided, comprising:

[0006] The analog hand operator unit is used to output the valve position command of the BEST small steam turbine supplementary steam valve according to the input data of each input terminal;

[0007] An operating state recognition unit, used for determining whether the supplementary steam valve needs to be opened or closed according to the operating state under each operating state, and outputting a signal indicating whether the supplementary steam valve needs to be opened or closed;

[0008] an automatic instruction output unit, used for outputting a valve position instruction indicating that the supplementary steam valve is in an automatic operation state according to a signal output by the working state identification unit; an input end of the automatic instruction output unit is connected to an output end of the working state identification unit, and an output end of the automatic instruction output unit is connected to an X input end of the analog quantity hand operator unit;

[0009] The switch signal input unit of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is used to output a switch signal indicating whether the eighth step of the BEST small steam turbine start-up sequence control is triggered; the switch signal input unit of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is connected to the ReqA input terminal of the analog handheld operator unit;

[0010] A tracking state recognition unit, used for outputting a signal indicating whether the supplementary steam valve is in a tracking state according to an output signal of the working state recognition unit; an input end of the tracking state recognition unit is connected to an output end of the working state recognition unit, and an output end of the tracking state recognition unit is connected to a TS input end of the analog hand operator unit;

[0011] The analog signal output unit of the valve position instruction of the BEST small steam turbine supplementary steam valve is connected to the signal output end of the analog hand operator unit.

[0012] In some embodiments of the present application, the operating state identification unit includes a switch signal input module for the instruction of the twentieth step of the BEST small steam turbine startup sequence control, a switch signal input module for the BEST small steam turbine tripping, a switch signal input module for the removal of the No. 7 low-pressure heater, a switch signal input module for the BEST small steam turbine bypass valve fully closed, a switch signal input module for the BEST small steam turbine overflow valve fully closed, an RS trigger module, a first negation module, a first and module, and a first operating state identification subunit; wherein:

[0013] The first operating condition identification subunit is used to output a signal indicating whether the exhaust steam pressure meets a preset condition according to the exhaust steam pressure of the BEST small steam turbine under the operating condition that the No. 8 low-pressure heater is cut off or both the No. 8 and No. 9 low-pressure heaters are cut off;

[0014] The switch signal input module of the instruction of the 20th step of the BEST small steam turbine startup sequential control is connected to the S end of the RS trigger module, and the switch signal input module of the BEST small steam turbine tripping is connected to the R end of the RS trigger;

[0015] The switch signal input module of the No. 7 low-voltage heater cutoff is connected to the input end of the first non-module;

[0016] The DV end of the RS trigger, the output end of the first non-module, the switch signal input module of the BEST small steam turbine bypass valve fully closed, the switch signal input module of the BEST small steam turbine overflow valve fully closed and the output end of the first operating condition identification subunit are all connected to the input end of the first and module.

[0017] As a possible implementation, the first operating condition identification subunit includes a switch signal input module for the removal of the No. 8 low-pressure heater, a switch signal input module for the removal of the No. 9 low-pressure heater, an analog signal input module for the exhaust pressure of the BEST small steam turbine, an analog signal input module for the back pressure setting value of the BEST small steam turbine, a first or module, a second and module, a subtraction module, a comparison less than module, and a third and module; wherein:

[0018] The switch signal input module of the No. 8 low-pressure heater cut-off and the switch signal input module of the No. 9 low-pressure heater cut-off are both connected to the input end of the second AND module, and the output ends of the switch signal input module of the No. 8 low-pressure heater cut-off and the second AND module are both connected to the input end of the first OR module;

[0019] The analog signal input module of the exhaust pressure of the BEST small steam turbine is connected to the first input end of the subtraction module, the analog signal input module of the back pressure setting value of the BEST small steam turbine is connected to the second input end of the subtraction module, and the output end of the subtraction module is connected to the input end of the comparison module;

[0020] The output end of the first OR module and the output end of the less-than module are both connected to the input end of the third AND module, and the output end of the third AND module is connected to the input end of the first AND module.

[0021] In some embodiments of the present application, the automatic instruction output unit includes a first constant module, a second constant module and an analog quantity switching selection module; wherein:

[0022] The first constant module is used to set the valve position instruction corresponding to closing the supplementary steam valve;

[0023] The second constant module is used to set the valve position instruction corresponding to opening the supplementary steam valve;

[0024] The first constant module is connected to the first input end of the analog quantity switching selection module; the second constant module is connected to the second input end of the analog quantity switching selection module; the output end of the operating state identification unit is connected to the EN end of the analog quantity switching selection module; the output end of the analog quantity switching selection module is connected to the X input end of the analog quantity hand operator unit.

[0025] Wherein, the first constant module is connected to the TR input terminal of the analog hand operator unit.

[0026] In some embodiments of the present application, the tracking state identification unit includes a second non-module and a pulse module; wherein:

[0027] The input end of the second non-module is connected to the output end of the operating state identification unit, the output end of the second non-module is connected to the input end of the pulse module, and the output end of the pulse module is connected to the TS input end of the analog hand operator unit.

[0028] As a possible implementation, the system further includes:

[0029] A first constant unit connected to the ToM input terminal of the analog hand operator unit, wherein a preset value in the first constant unit is 0.

[0030] In some embodiments of the present application, the system further comprises:

[0031] A second constant unit is used to set a high limit value of the output of the analog hand operator unit; the second constant unit is connected to the MaxOut input terminal of the analog hand operator unit;

[0032] The third constant unit is used to set the lower limit value of the output of the analog hand operator unit; the third constant unit is connected to the MinOut input terminal of the analog hand operator unit.

[0033] According to the technical solution of the present application, the operating state identification unit, the tracking state identification unit, the manual state identification unit and the switch signal input unit of the instruction of the eighth step of the BEST small steam turbine startup sequential control are combined with different operating conditions to determine the control state of the BEST small steam turbine supplementary steam valve, and the analog hand operator unit outputs the corresponding valve position instruction of the BEST small steam turbine supplementary steam valve according to the control state of the supplementary steam valve, so as to achieve the goal of automatic adjustment in response to different operating conditions. The system can be fully applicable to BEST small steam turbine equipment with small generators, which can not only ensure the safe, stable and efficient operation of the BEST small steam turbine, but also achieve the effect of reducing staff and increasing efficiency.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0036] Figure 1 This is a structural block diagram of the BEST small steam turbine with generator in the embodiment of the present application;

[0037] Figure 2 A structural block diagram of an automatic regulating control system for a BEST small steam turbine supplementary steam valve provided in an embodiment of the present application;

[0038] Figure 3 A structural block diagram of another automatic regulating control system of a BEST small steam turbine supplementary steam valve provided in an embodiment of the present application;

[0039] Figure 4 Schematic diagram of the corresponding relationship between the BEST small steam turbine load and the back pressure setting value in the embodiment of the present application.

[0040] Reference numerals:

[0041] BEST small steam turbine, 101; generator, 102; converter, 103; No. 1 main steam valve, V01; No. 2 main steam valve, V02; No. 1 main steam regulating valve, V03; No. 2 main steam regulating valve, V04; No. 7 extraction check valve, V05; No. 7 extraction steam electric valve, V06; overflow valve pipeline stop valve, V07; bypass valve, V08; steam supplement valve, V09; overflow valve, V10. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0043] It should be noted that with the rapid development of my country's power industry, the ultra-supercritical double reheat coal-fired unit BEST small steam turbine with small generator, as a new and important equipment in the power plant, plays a vital role in power production. During the start-up sequence of the BEST small steam turbine, if the adjustment control of the steam supply valve fails, it will cause insufficient steam supply to the BEST small steam turbine, seriously affecting the normal start-up of the BEST small steam turbine. Because each step of the BEST small steam turbine start-up sequence is set with a corresponding step time, if the steam supply valve fails for a long time and the steam supply is insufficient, it will cause the preset step time to be exceeded, and finally cause the start-up sequence of the BEST small steam turbine to fail, seriously delaying the start-up plan of the unit and failing to generate electricity and connect to the grid in time, which will affect the economy and safety of the unit.

[0044] Therefore, considering the unique operating characteristics of the BEST small steam turbine with a small generator, designing an automatic regulation and control system for the BEST small steam turbine supplementary steam valve has become an urgent problem to be solved.

[0045] In order to solve the above problems, the present application provides an automatic regulation and control system for a BEST small steam turbine supplementary steam valve.

[0046] It should be noted that if Figure 1As shown, the BEST small steam turbine 101 is connected to the generator 102 through a transmission shaft, the generator 102 is connected to the converter 103, and the BEST small steam turbine 101 is connected to the steam source through two steam input pipelines, one of which is equipped with a No. 1 main steam valve V01 and a No. 1 main steam regulating valve V03, and the other steam input pipeline is equipped with a No. 2 main steam valve V02 and a No. 2 main steam regulating valve V04. The No. 7 extraction steam outlet of the BEST small steam turbine 101 is connected to the No. 7 extraction check valve V05, the No. 7 extraction steam electric valve V06 and the exhaust steam header 104 in sequence through pipelines. The exhaust steam header 104 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 104 and the No. 8 low-pressure heater is connected with the overflow valve pipeline stop valve V07 and the overflow valve V10. The pipeline between the exhaust steam header 104 and the condenser is connected with the bypass valve V08. The pipeline between the exhaust steam header 104 and the steam source is connected with the supplementary steam valve V09.

[0047] Figure 2 This is a structural block diagram of an automatic control system for a BEST small steam turbine supplementary steam valve provided in an embodiment of the present application. Figure 2 As shown, the system includes: an analog quantity hand-operated unit 201, an operating status identification unit 202, an automatic instruction output unit 203, a switch signal input unit 204 for the instruction of the eighth step of the BEST small steam turbine start-up sequence control, a tracking status identification unit 205 and an analog quantity signal output unit 206 for the valve position instruction of the BEST small steam turbine supplementary steam valve.

[0048] In some embodiments of the present application, the analog handheld operator unit 201 is used to output the valve position instruction of the BEST small steam turbine supplementary steam valve according to the input data of each input terminal. The operating state identification unit 202 is used to determine whether the supplementary steam valve needs to be opened or closed according to the operating state under each operating condition, and output a signal indicating that the supplementary steam valve is opened or closed. The automatic instruction output unit 203 is used to output the valve position instruction indicating that the supplementary steam valve is in the automatic operation state according to the signal output by the operating state identification unit 202. The input terminal of the automatic instruction output unit 203 is connected to the output terminal of the operating state identification unit 202, and the output terminal of the automatic instruction output unit 203 is connected to the X input terminal of the analog handheld operator unit 201.

[0049] The switch signal input unit 204 of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is used to output the switch signal indicating whether the eighth step of the BEST small steam turbine start-up sequence control is triggered. The switch signal input unit 204 of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is connected to the ReqA input terminal of the analog quantity hand operator unit 201. Among them, the eighth step of the BEST small steam turbine start-up sequence control is to check the state of the main steam valve of the BEST small steam turbine, the bypass quick opening solenoid valve is de-energized, the bypass valve is fully open and adjustable, the exhaust valve, the supplementary steam valve, the overflow valve, and the bypass electric door of the BEST small steam turbine are opened, and the supplementary steam valve is confirmed to be put into automatic operation.

[0050] The ReqA input terminal of the analog handheld operator unit 201 is a switch for switching to the automatic operation state. If the switch signal received by the ReqA input terminal is 1, it means that the steam supply valve is currently in the automatic operation state, that is, the analog handheld operator unit 201 uses the value of the X input terminal as the valve position instruction of the steam supply valve. If the switch signal received by the ReqA input terminal is 0, it means that the steam supply valve is not currently in the automatic operation state, that is, the X input terminal of the analog handheld operator unit 201 is not triggered. The switch signal input unit 204 of the instruction of the eighth step of the BEST small steam turbine start-up sequence is connected to the ReqA input terminal of the analog handheld operator unit 201, wherein the switch signal of the switch signal input unit 204 of the instruction of the eighth step of the BEST small steam turbine start-up sequence is 0 before the eighth step of the BEST small steam turbine start-up sequence is not triggered, and the switch signal of the switch signal input unit 204 of the instruction of the eighth step of the BEST small steam turbine start-up sequence is 1 after the eighth step of the BEST small steam turbine start-up sequence is triggered until the BEST small steam turbine start-up sequence is completed. That is to say, before the eighth step of the BEST small steam turbine start-up sequence is triggered, the supplementary steam valve is not in the automatic operation state, and after the eighth step of the BEST small steam turbine start-up sequence is triggered, the supplementary steam valve is in the automatic operation state, and the analog handheld operator unit 201 uses the value of the X input terminal as the valve position instruction of the supplementary steam valve output.

[0051] The tracking state identification unit 205 is used to output a signal indicating whether the supplementary steam valve is in the tracking state according to the output signal of the working state identification unit 202. The input end of the tracking state identification unit 205 is connected to the output end of the working state identification unit 202, and the output end of the tracking state identification unit 205 is connected to the TS input end of the analog hand operator unit 201. The analog signal output unit 206 of the valve position instruction of the BEST small steam turbine supplementary steam valve is connected to the signal output end of the analog hand operator unit 201. The analog signal output unit 206 of the valve position instruction of the BEST small steam turbine supplementary steam valve is used to control the valve position of the supplementary steam valve.

[0052] The TS input terminal of the analog hand operator unit 201 is a switch in the tracking state. When the switch signal received at the TS input terminal is 1, the supplementary steam valve is in the tracking state, and the analog hand operator unit 201 uses the tracking value of the TR input terminal as the valve position instruction of the supplementary steam valve. When the switch signal received at the TS input terminal is 0, the supplementary steam valve is not in the tracking state. In some embodiments of the present application, the tracking value of the TR input terminal of the analog hand operator unit 201 can be set to 0, that is, if the switch signal received at the TS input terminal of the analog hand operator unit 201 is 1, the output valve position instruction is to close the supplementary steam valve.

[0053] In some embodiments of the present application, Figure 2 As shown, the system may further include a first constant unit 207, a second constant unit 208 and a third constant unit 209. The first constant unit 207 is connected to the ToM input terminal of the analog hand operator module 201, and the preset value in the first constant unit is 0. The ToM input terminal of the analog hand operator module 201 is a switch for switching to a manual operation state. When the switch signal received by the ToM input terminal is 1, the analog hand operator module 201 is in a manual operation state. When the switch signal received by the ToM input terminal is 0, the supplementary steam valve is not in a manual state, that is, the analog hand operator module 201 is not in a manual operation state. Setting the preset value in the first constant unit to 0 indicates that the manual control module of the supplementary steam valve cannot be triggered, and the supplementary steam valve can be automatically controlled by the system.

[0054] In addition, the second constant unit 208 is used to set the high limit value of the analog hand operator unit output. The second constant unit 208 is connected to the MaxOut input terminal of the analog hand operator unit 201. The third constant unit 209 is used to set the low limit value of the analog hand operator unit 201 output. The third constant unit 209 is connected to the MinOut input terminal of the analog hand operator unit 201. As an example, the high limit value of the analog hand operator unit 201 output set by the second constant unit 208 is 100, and the low limit value of the analog hand operator unit 201 output set by the third constant unit 209 is 0.

[0055] In some embodiments of the present application, Figure 3As shown, the operating state identification unit 202 includes a switch signal input module 301 for the instruction of the twentieth step of the BEST small steam turbine start-up sequence, a switch signal input module 302 for the BEST small steam turbine tripping, a switch signal input module 303 for the removal of the No. 7 low-pressure heater, a switch signal input module 304 for the BEST small steam turbine bypass valve being fully closed, a switch signal input module 305 for the BEST small steam turbine overflow valve being fully closed, an RS trigger module 313, a first negation module 314, a first and module 316 and a first operating state identification subunit 202-1.

[0056] Among them, the first operating condition identification subunit 202-1 is used to output a signal indicating whether the exhaust pressure meets the preset condition according to the exhaust pressure of the BEST small steam turbine under the operating condition that the No. 8 low-pressure heater is cut off or the No. 8 and No. 9 low-pressure heaters are both cut off. Whether the exhaust pressure meets the preset condition refers to whether the difference between the exhaust pressure and the preset value of the back pressure is less than the difference threshold. If the difference between the exhaust pressure and the preset value of the back pressure is less than the difference threshold, the first operating condition identification subunit 202-1 outputs a high-level signal, otherwise the first operating condition identification subunit 202-1 outputs a low-level signal.

[0057] like Figure 3 As shown, the switch signal input module 301 of the instruction of the 20th step of the BEST small steam turbine startup sequence control is connected to the S end of the RS trigger module 313, and the switch signal input module 302 of the BEST small steam turbine tripping is connected to the R end of the RS trigger. The switch signal input module 303 of the removal of the No. 7 low-pressure heater is connected to the input end of the first non-module 314. The DV end of the RS trigger 313, the output end of the first non-module 314, the switch signal input module 304 of the BEST small steam turbine bypass valve fully closed, the switch signal input module 305 of the BEST small steam turbine overflow valve fully closed and the output end of the first working condition identification subunit 202-1 are all connected to the input end of the first and module.

[0058] Among them, the 20th step of the BEST small steam turbine startup sequence is to put the No. 8 low-pressure heater into operation, the overflow valve into automatic operation, the back pressure controller and the final stage pressure ratio controller into operation, and the high back pressure limit value setting into operation. If the 20th step of the BEST small steam turbine startup sequence is triggered, the switch signal input module 301 of the instruction of the 20th step of the BEST small steam turbine startup sequence outputs a switch signal 1, otherwise it outputs a switch signal 0. If the switch signal input module 302 of the BEST small steam turbine trip outputs a switch signal 0, and the switch signal input module 301 of the instruction of the 20th step of the BEST small steam turbine startup sequence outputs a switch signal 1, then the DV terminal of the RS trigger outputs a switch signal 1, otherwise the DV terminal of the RS trigger outputs a switch signal 0. That is to say, if the twentieth step of the BEST small steam turbine start-up sequence is triggered and the BEST small steam turbine has not tripped, and the No. 7 low-pressure heater has not been cut off, and the BEST small steam turbine bypass valve and overflow valve are both fully closed, and the No. 8 low-pressure heater is cut off or both the No. 8 and No. 9 low-pressure heaters are cut off, and the exhaust steam pressure meets the preset conditions, then the operating condition identification unit 202 outputs a signal indicating the opening of the BEST small steam turbine supplementary steam valve, otherwise the operating condition identification unit 202 outputs a signal indicating the closing of the BEST small steam turbine supplementary steam valve.

[0059] As a possible way to achieve this, Figure 3 As shown, the first operating condition identification subunit 202-1 includes a switch signal input module 306 for cutting off the low-pressure heater No. 8, a switch signal input module 307 for cutting off the low-pressure heater No. 9, an analog signal input module 308 for the exhaust pressure of the BEST small steam turbine, an analog signal input module 309 for the back pressure setting value of the BEST small steam turbine, a first OR module 319, a second AND module 317, a subtraction module 320, a comparison less than module 321 and a third AND module 318.

[0060] Among them, the switch signal input module 306 of the cut-off of the No. 8 low-pressure heater and the switch signal input module 307 of the cut-off of the No. 9 low-pressure heater are both connected to the input end of the second AND module 317, and the output ends of the switch signal input module 306 of the cut-off of the No. 8 low-pressure heater and the second AND module 317 are both connected to the input end of the first OR module 319. The analog signal input module 308 of the exhaust pressure of the BEST small steam turbine is connected to the first input end of the subtraction module 320, the analog signal input module 309 of the back pressure setting value of the BEST small steam turbine is connected to the second input end of the subtraction module 320, and the output end of the subtraction module 320 is connected to the input end of the less than module 321. The output end of the first OR module 319 and the output end of the less than module 321 are both connected to the input end of the third AND module 318, and the output end of the third AND module 318 is connected to the input end of the first AND module 318.

[0061] Among them, the analog signal input module 309 of the BEST small steam turbine back pressure setting value is used to determine the back pressure setting value according to the unit load based on the corresponding relationship between the load and the back pressure setting value. As an example, Figure 4 The schematic diagram of the corresponding relationship between the BEST small steam turbine load and the back pressure setting value in the embodiment of the present application, the analog signal input module 309 of the BEST small steam turbine back pressure setting value is based on the following example: Figure 4 The corresponding relationship shown is determined according to the unit load to determine the corresponding back pressure setting value. The subtraction module 320 subtracts the exhaust pressure received at the first input end from the back pressure preset value received at the second input end, and inputs the obtained difference to the comparison less than module 321. The comparison less than module 321 is preset with a difference threshold, for example, the difference threshold preset in the comparison less than module 321 can be 0.05. If the difference received by the comparison less than module 321 is less than the preset difference threshold, the comparison less than module 321 outputs a switch signal 1, otherwise the comparison less than module 321 outputs a switch signal 0.

[0062] That is, if the No. 8 low-pressure heater is cut off, and the difference between the exhaust pressure of the BEST small steam turbine and the back pressure setting value is less than the difference threshold, the first operating condition identification subunit 202-1 outputs a switch signal 1. If the No. 8 low-pressure heater and the No. 9 low-pressure heater are both cut off, and the difference between the exhaust pressure of the BEST small steam turbine and the back pressure setting value is less than the difference threshold, the first operating condition identification subunit 202-1 also outputs a switch signal 1.

[0063] like Figure 3 As shown, in some embodiments of the present application, the automatic instruction output unit 203 includes a first constant module 310, a second constant module 311 and an analog quantity switching selection module 312. Among them, the first constant module 310 is used to set the valve position instruction corresponding to closing the supplementary steam valve. The second constant module 311 is used to set the valve position instruction corresponding to opening the supplementary steam valve. The first constant module 310 is connected to the first input end of the analog quantity switching selection module 312, the second constant module 311 is connected to the second input end of the analog quantity switching selection module 312, the output end of the operating state identification unit 202 is connected to the EN end of the analog quantity switching selection module 312, and the output end of the analog quantity switching selection module 312 is connected to the X input end of the analog quantity hand operator unit 201. The output end of the operating state identification unit 202 is connected to the EN end of the analog quantity switching selection module 312, which is equivalent to the output end of the first AND module 316 being connected to the EN end of the analog quantity switching selection module 312.

[0064] Among them, the preset value in the first constant unit 310 is 0, and the preset value in the second constant unit 311 is 100. If the switch signal output by the first AND module 316 is 0, that is, the switch signal received by the EN end of the analog switching selection module 312 is 0, then the output value of the analog selection module 312 is 0, that is, the received value of the X input end of the analog hand operator unit 201 is 0. If the switch signal received by the ReqA input end of the analog hand operator unit 201 is 1, then the valve position instruction of the steam supply valve output is to close the steam supply valve. If the switch signal output by the first AND module 316 is 1, that is, the switch signal received by the EN end of the analog switching selection module 312 is 1, then the output value of the analog selection module 312 is 100, that is, the received value of the X input end of the analog hand operator unit 201 is 100. If the switch signal received by the ReqA input end of the analog hand operator unit 201 is 1, then the valve position instruction of the steam supply valve output is to open the steam supply valve.

[0065] In addition, if Figure 3 As shown, the first constant module 310 can also be connected to the TR input terminal of the analog hand operator unit 201, that is, the tracking value of the TR input terminal of the analog hand operator unit 201 is 0.

[0066] In some embodiments of the present application, Figure 3 As shown, the tracking state identification unit 205 includes a second non-module 315 and a pulse module 322. The input end of the second non-module 315 is connected to the output end of the working state identification unit 202, the output end of the second non-module 315 is connected to the input end of the pulse module 322, and the output end of the pulse module 322 is connected to the TS input end of the analog hand operator unit 201. In other words, the input end of the second non-module 315 is connected to the output end of the first and module 316.

[0067] Among them, the pulse module 322 is provided with a pulse time, for example, the pulse time can be set to 2s. If the first AND module 316 outputs a switch signal of 1, the switch signal output by the pulse module 322 is 0, that is, the switch signal received by the TS input end of the analog hand operator unit 201 is 0, and the supplementary steam valve is not in the tracking state. If the first AND module 316 outputs a switch signal of 0, the switch signal output by the pulse module 322 within the pulse time is 1, the switch signal received by the TS input end of the analog hand operator unit 201 is 1, the supplementary steam valve is in the tracking state, and the valve position command output by the analog hand operator unit 201 is the tracking value of the TR end, that is, the output valve position command is to close the supplementary steam valve.

[0068] That is to say, if the twentieth step of the BEST small steam turbine start-up sequence is not triggered, or the BEST small steam turbine trips, or the No. 7 low-pressure heater is cut off, or the BEST small steam turbine bypass valve full-close signal is not sent, or the BEST small steam turbine overflow valve full-close signal is not sent, or the difference between the exhaust pressure and the back pressure setting value of the BEST small steam turbine is greater than or equal to the difference threshold, then the first AND module 316 outputs the switch signal 0, and the switch signal received at the TS input end of the analog handheld operator unit 201 is 1, that is, the analog handheld operator unit 201 is in the tracking state, and the output valve position instruction is the tracking value 0.

[0069] According to the automatic adjustment control system of the BEST small steam turbine supplementary steam valve of the embodiment of the present application, the operating state recognition unit, the tracking state recognition unit, the manual state recognition unit and the switch signal input unit of the instruction of the eighth step of the BEST small steam turbine startup sequential control are combined with different operating conditions to determine the control state of the BEST small steam turbine supplementary steam valve, and the analog quantity hand operator unit outputs the corresponding valve position instruction of the BEST small steam turbine supplementary steam valve according to the control state of the supplementary steam valve, so as to achieve the goal of automatic adjustment in response to different operating conditions. The system can be fully applicable to the equipment of the BEST small steam turbine with a small generator, which can not only ensure the safe, stable and efficient operation of the BEST small steam turbine, but also achieve the effect of reducing staff and increasing efficiency.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described 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.

[0071] 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 this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An automatic regulating control system for a BEST small steam turbine supplementary steam valve, characterized in that: The system comprises: The analog hand operator unit is used to output the valve position command of the BEST small steam turbine supplementary steam valve according to the input data of each input terminal; An operating state recognition unit, used for determining whether the supplementary steam valve needs to be opened or closed according to the operating state under each operating state, and outputting a signal indicating whether the supplementary steam valve needs to be opened or closed; an automatic instruction output unit, used for outputting a valve position instruction indicating that the supplementary steam valve is in an automatic operation state according to a signal output by the working state identification unit; an input end of the automatic instruction output unit is connected to an output end of the working state identification unit, and an output end of the automatic instruction output unit is connected to an X input end of the analog quantity hand operator unit; The switch signal input unit of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is used to output a switch signal indicating whether the eighth step of the BEST small steam turbine start-up sequence control is triggered; the switch signal input unit of the instruction of the eighth step of the BEST small steam turbine start-up sequence control is connected to the ReqA input terminal of the analog handheld operator unit; A tracking state recognition unit, used for outputting a signal indicating whether the supplementary steam valve is in a tracking state according to an output signal of the working state recognition unit; an input end of the tracking state recognition unit is connected to an output end of the working state recognition unit, and an output end of the tracking state recognition unit is connected to a TS input end of the analog hand operator unit; The analog signal output unit of the valve position instruction of the BEST small steam turbine supplementary steam valve is connected to the signal output end of the analog hand operator unit.

2. The system according to claim 1, characterized in that The operating state identification unit includes a switch signal input module for the instruction of the 20th step of the BEST small steam turbine startup sequence control, a switch signal input module for the BEST small steam turbine tripping, a switch signal input module for the removal of the No. 7 low-pressure heater, a switch signal input module for the BEST small steam turbine bypass valve fully closed, a switch signal input module for the BEST small steam turbine overflow valve fully closed, an RS trigger module, a first negation module, a first and module and a first operating state identification subunit; wherein: The first operating condition identification subunit is used to output a signal indicating whether the exhaust steam pressure meets a preset condition according to the exhaust steam pressure of the BEST small steam turbine under the operating condition that the No. 8 low-pressure heater is cut off or both the No. 8 and No. 9 low-pressure heaters are cut off; The switch signal input module of the instruction of the 20th step of the BEST small steam turbine startup sequential control is connected to the S end of the RS trigger module, and the switch signal input module of the BEST small steam turbine tripping is connected to the R end of the RS trigger; The switch signal input module of the No. 7 low-voltage heater cutoff is connected to the input end of the first non-module; The DV end of the RS trigger, the output end of the first non-module, the switch signal input module of the BEST small steam turbine bypass valve fully closed, the switch signal input module of the BEST small steam turbine overflow valve fully closed and the output end of the first operating condition identification subunit are all connected to the input end of the first and module.

3. The system according to claim 2, characterized in that The first working condition identification subunit includes a switch signal input module for the removal of the No. 8 low-pressure heater, a switch signal input module for the removal of the No. 9 low-pressure heater, an analog signal input module for the exhaust pressure of the BEST small steam turbine, an analog signal input module for the back pressure setting value of the BEST small steam turbine, a first or module, a second and module, a subtraction module, a comparison less than module, and a third and module; wherein: The switch signal input module of the No. 8 low-pressure heater cut-off and the switch signal input module of the No. 9 low-pressure heater cut-off are both connected to the input end of the second AND module, and the output ends of the switch signal input module of the No. 8 low-pressure heater cut-off and the second AND module are both connected to the input end of the first OR module; The analog signal input module of the exhaust pressure of the BEST small steam turbine is connected to the first input end of the subtraction module, the analog signal input module of the back pressure setting value of the BEST small steam turbine is connected to the second input end of the subtraction module, and the output end of the subtraction module is connected to the input end of the comparison module; The output end of the first OR module and the output end of the less-than module are both connected to the input end of the third AND module, and the output end of the third AND module is connected to the input end of the first AND module.

4. The system according to claim 1, characterized in that The automatic instruction output unit includes a first constant module, a second constant module and an analog quantity switching selection module; wherein: The first constant module is used to set the valve position instruction corresponding to closing the supplementary steam valve; The second constant module is used to set the valve position instruction corresponding to opening the supplementary steam valve; The first constant module is connected to the first input end of the analog quantity switching selection module; the second constant module is connected to the second input end of the analog quantity switching selection module; the output end of the operating state identification unit is connected to the EN end of the analog quantity switching selection module; the output end of the analog quantity switching selection module is connected to the X input end of the analog quantity hand operator unit.

5. The system according to claim 4, characterized in that The first constant module is connected to the TR input terminal of the analog hand operator unit.

6. The system according to claim 1, characterized in that The tracking state identification unit includes a second non-module and a pulse module; wherein: The input end of the second non-module is connected to the output end of the operating state identification unit, the output end of the second non-module is connected to the input end of the pulse module, and the output end of the pulse module is connected to the TS input end of the analog hand operator unit.

7. The system according to claim 1, characterized in that Also includes: A first constant unit connected to the ToM input terminal of the analog hand operator module, wherein the preset value in the first constant unit is 0.

8. The system according to any one of claims 1 to 7, characterized in that: Also includes: A second constant unit is used to set a high limit value of the output of the analog hand operator unit; the second constant unit is connected to the MaxOut input terminal of the analog hand operator unit; The third constant unit is used to set the lower limit value of the output of the analog hand operator unit; the third constant unit is connected to the MinOut input terminal of the analog hand operator unit.

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