CN115434765A - Automatic regulation control system of steam supplementing valve of BEST small steam turbine - Google Patents

Automatic regulation control system of steam supplementing valve of BEST small steam turbine Download PDF

Info

Publication number
CN115434765A
CN115434765A CN202211110255.4A CN202211110255A CN115434765A CN 115434765 A CN115434765 A CN 115434765A CN 202211110255 A CN202211110255 A CN 202211110255A CN 115434765 A CN115434765 A CN 115434765A
Authority
CN
China
Prior art keywords
module
unit
steam
analog quantity
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211110255.4A
Other languages
Chinese (zh)
Inventor
吴青云
郭峤
谭祥帅
王海涛
高玉峰
刘世雄
高景辉
杨博
何胜
高奎
蔺奕存
辛志波
何洋
张灏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202211110255.4A priority Critical patent/CN115434765A/en
Publication of CN115434765A publication Critical patent/CN115434765A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/003—Arrangements for testing or measuring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)

Abstract

The application provides an automatically regulated control system of small steam turbine admission valve of BEST, this system includes: the system comprises an analog quantity manual operator unit, a working condition state identification unit, an automatic instruction output unit, a switching quantity signal input unit of instructions of the BEST small steam turbine starting sequence control eighth step, a tracking state identification unit and an analog quantity signal output unit of valve position instructions of a BEST small steam turbine bypass valve, so that the automatic control of the opening and closing of the steam supplementing valve according to different working conditions is realized. The system can be completely suitable for equipment with a small generator of the BEST small steam turbine, can ensure the safe, stable and efficient operation of the BEST small steam turbine, and can also achieve the effects of reducing personnel and improving efficiency.

Description

Automatic regulation control system of BEST small steam turbine steam supplementing valve
Technical Field
The application relates to the field of intelligent control of a BEST small turbine with a small generator of an ultra-supercritical double-reheating coal-fired unit, in particular to an automatic adjustment control system of a steam supplement valve of the BEST small turbine.
Background
With the rapid development of the electric power industry in China, a BEST small turbine of an ultra-supercritical double-reheat coal-fired unit is provided with a small generator and serves as brand-new important equipment of a power plant, and plays a vital role in electric power production. When the BEST small turbine is started and controlled sequentially, if the steam supplementing valve fails in regulation and control, the influence of insufficient steam supplementing of the BEST small turbine can be caused, and the normal starting of the BEST small turbine is seriously influenced. Because each step sequence of the start sequence control of the BEST small turbine is provided with corresponding step sequence time, if the steam supplementing valve fails for a long time and the steam supplementing is insufficient, the preset step sequence time can be exceeded, finally the start sequence control of the BEST small turbine fails, the start plan of the unit is seriously delayed, the power generation and grid connection cannot be timely carried out, and the economic efficiency and the safety of the unit are influenced.
Therefore, aiming at the unique operation characteristics of the BEST small turbine with the small generator, the automatic regulation control system of the steam supplementing valve of the BEST small turbine is designed to solve the problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the problems, the application provides an automatic regulation control system of a steam supplementing valve of a BEST small steam turbine.
According to an aspect of the application, provide an automatic regulation control system of BEST small steam turbine admission valve, include:
the analog quantity manual operator unit is used for outputting a valve position instruction of a steam compensating valve of the BEST small steam turbine according to input data of each input end;
the working condition state identification unit is used for determining whether the steam supplementing valve needs to be opened or closed according to the running state under each working condition and outputting a signal for indicating that the steam supplementing valve is opened or closed;
the automatic instruction output unit is used for outputting a valve position instruction used for indicating that the steam supplementing valve is in an automatic operation state according to the signal output by the working condition state identification unit; the input end of the automatic instruction output unit is connected with the output end of the working condition state identification unit, and the output end of the automatic instruction output unit is connected with the X input end of the analog quantity manual operator unit;
the switching value signal input unit is used for outputting a switching value signal which indicates whether the BEST small turbine starting sequential control eighth step is triggered; a switching value signal input unit of the instruction of the eighth step of the BEST small steam turbine starting sequence control is connected with the ReqA input end of the analog quantity manual operator unit;
the tracking state identification unit is used for outputting a signal for indicating whether the steam supplementing valve is in a tracking state or not according to the output signal of the working condition state identification unit; the input end of the tracking state identification unit is connected with the output end of the working condition state identification unit, and the output end of the tracking state identification unit is connected with the TS input end of the analog quantity manual operator unit;
and an analog quantity signal output unit of a valve position instruction of a steam supplementing valve of the BEST small steam turbine is connected with a signal output end of the analog quantity manual operator unit.
In some embodiments of the present application, the operating condition state identifying unit includes a switching value signal input module of a command of a twenty-second step of start sequence control of the small BEST turbine, a switching value signal input module of tripping of the small BEST turbine, a switching value signal input module of cutting off of a low-pressure heater No. 7, a switching value signal input module of full closing of a bypass valve of the small BEST turbine, a switching value signal input module of full closing of an overflow valve of the small BEST turbine, an RS trigger module, a first non-module, a first and module, and a first operating condition identifying subunit; wherein:
the first working condition identification subunit is used for outputting a signal for indicating whether the steam exhaust pressure meets a preset condition or not according to the steam exhaust pressure of the BEST small steam turbine under the working condition that the No. 8 low-pressure heater is cut off or the No. 8 low-pressure heater and the No. 9 low-pressure heater are both cut off;
the switching value signal input module of the instructions of the twenty-second step of starting sequence control of the BEST small turbine is connected with the S end of the RS trigger module, and the switching value signal input module of tripping of the BEST small turbine is connected with the R end of the RS trigger module;
the switching value signal input module cut off by the No. 7 low-voltage heater is connected with the input end of the first non-module;
the DV end of the RS trigger, the output end of the first non-module, the fully-closed switching value signal input module of the BEST small turbine bypass valve, the fully-closed switching value signal input module of the BEST small turbine overflow valve and the output end of the first working condition identification subunit are connected with the input end of the first and module.
As a possible implementation manner, the first operating condition identifying subunit includes a switching value signal input module of No. 8 low-pressure heater removal, a switching value signal input module of No. 9 low-pressure heater removal, an analog quantity signal input module of the exhaust pressure of the small BEST turbine, an analog quantity signal input module of the backpressure set value of the small BEST turbine, a first or module, a second and module, a subtraction module, a smaller comparison module, and a third and module; wherein:
the switching value signal input module cut off by the No. 8 low-voltage heater and the switching value signal input module cut off by the No. 9 low-voltage heater are both connected with the input end of the second AND module, and the switching value signal input module cut off by the No. 8 low-voltage heater and the output end of the second AND module are both connected with the input end of the first OR module;
the analog quantity signal input module of the exhaust steam pressure of the BEST small steam turbine is connected with the first input end of the subtraction module, the analog quantity signal input module of the backpressure set value of the BEST small steam turbine is connected with the second input end of the subtraction module, and the output end of the subtraction module is connected with the input end of the small comparison module;
the output end of the first or module and the output end of the smaller module are both connected with the input end of the third and module, and the output end of the third and module is connected with the input end of the first and module.
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:
the first constant module is used for setting a valve position instruction corresponding to closing the steam supplementing valve;
the second constant module is used for setting a valve position instruction corresponding to the opening of the steam supplementing valve;
the first constant module is connected with a first input end of the analog quantity switching selection module; the second constant module is connected with a second input end of the analog quantity switching selection module; the output end of the working condition state identification unit is connected with the EN end of the analog quantity switching selection module; the output end of the analog quantity switching selection module is connected with the X input end of the analog quantity manual operator unit.
The first constant module is connected with the TR input end of the analog quantity manual operator unit.
In some embodiments of the present application, 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 with the output end of the working condition state identification unit, the output end of the second non-module is connected with the input end of the pulse module, and the output end of the pulse module is connected with the TS input end of the analog quantity manual operator unit.
As a possible implementation manner, the system further includes:
and the first constant unit is connected with the ToM input end of the analog manual operator unit, and the preset value in the first constant unit is 0.
In some embodiments of the present application, the system further comprises:
the second constant unit is used for setting an upper limit value output by the analog quantity manual operator unit; the second constant unit is connected with a MaxOut input end of the analog quantity manual operator unit;
the third constant unit is used for setting a low limit value output by the analog manual operator unit; and the third constant unit is connected with a MinOut input end of the analog quantity manual operator unit.
According to the technical scheme of the application, the control state of the steam supplementing valve of the BEST small steam turbine is determined by combining different working conditions through a working condition state recognition unit, a tracking state recognition unit, a manual state recognition unit and a switching value signal input unit of the command of the eighth step of starting and controlling the BEST small steam turbine, and the corresponding valve position command of the steam supplementing valve of the BEST small steam turbine is output through an analog quantity manual operator unit according to the control state of the steam supplementing valve, so that the aim of automatic adjustment responding according to different working conditions is fulfilled. The system can be completely suitable for equipment with a small generator of the BEST small steam turbine, can ensure the safe, stable and efficient operation of the BEST small steam turbine, and can also achieve the effects of reducing personnel and improving efficiency.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a BEST small steam turbine with a generator according to an embodiment of the present application;
FIG. 2 is a block diagram of an automatic regulating control system of a steam supply valve of a BEST small steam turbine provided in the embodiment of the present application;
FIG. 3 is a block diagram of another automatic regulating control system for a steam supply valve of a BEST small steam turbine according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the relationship between BEST small turbine load and backpressure set value in the embodiment of the present application.
Reference numerals:
BEST small turbine, 101; a generator, 102; a current transformer, 103; a first main valve, V01; a second main valve, V02; a first main steam adjusting valve, V03; a second main steam adjusting valve, V04; no. seven pumping check valve, V05; a No. seven steam extraction electric valve V06; relief valve pipeline stop valve, V07; bypass valve, V08; a steam supplement valve, V09; relief valve, V10.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
It should be noted that, with the rapid development of the electric power industry in China, the small turbine of the BEST of the ultra-supercritical secondary reheating coal-fired unit with the small generator is taken as a brand new important device of a power plant, and plays a vital role in the electric power production. When the BEST small turbine is started and controlled sequentially, if the steam supplementing valve fails in regulation and control, the influence of insufficient steam supplementing of the BEST small turbine can be caused, and the normal starting of the BEST small turbine is seriously influenced. Because each step sequence of the start sequence control of the BEST small turbine is provided with corresponding step sequence time, if the steam supplementing valve fails for a long time and the steam supplementing is insufficient, the preset step sequence time can be exceeded, finally the start sequence control of the BEST small turbine fails, the start plan of the unit is seriously delayed, the power generation and grid connection cannot be timely carried out, and the economic efficiency and the safety of the unit are influenced.
Therefore, aiming at the unique operation characteristics of the BEST small turbine with the small generator, the automatic regulation control system of the steam supplementing valve of the BEST small turbine is designed to solve the problem which needs to be solved urgently at present.
In order to solve the problems, the application provides an automatic regulation control system of a steam supplementing valve of a BEST small steam turbine.
It should be noted that, as shown in fig. 1, the small BEST turbine 101 is connected to the generator 102 through a transmission shaft, the generator 102 is connected to the converter 103, the small BEST turbine 101 is connected to the steam source through two steam input pipelines, one of the two steam input pipelines is provided with a first main throttle V01 and a first main throttle V03, and the other steam input pipeline is provided with a second main throttle V02 and a second main throttle V04. The No. seven steam extraction outlet of the BEST small steam turbine 101 is sequentially connected with a No. seven steam extraction check valve V05, a No. seven steam extraction electric valve V06 and a steam extraction header 104 through pipelines, the steam extraction header 104 is respectively connected with a steam source, a condenser, a No. 8 low heater and a No. 7 low heater through pipelines, an overflow valve pipeline stop valve V07 and an overflow valve V10 are connected on the pipeline between the steam extraction header 104 and the No. 8 low heater, a bypass valve V08 is connected on the pipeline between the steam extraction header 104 and the condenser, and a steam supplementing valve V09 is connected on the pipeline between the steam extraction header 104 and the steam source.
Fig. 2 is a block diagram of an automatic adjustment control system of a steam supply valve of a small BEST turbine according to an embodiment of the present application. As shown in fig. 2, the system includes: the system comprises an analog quantity manual operator unit 201, a working condition state recognition unit 202, an automatic command output unit 203, a switching quantity signal input unit 204 of a command of the eighth step of BEST small turbine starting sequence control, a tracking state recognition unit 205 and an analog quantity signal output unit 206 of a valve position command of a BEST small turbine steam supplementing valve.
In some embodiments of the present application, the analog manual operator unit 201 is configured to output a valve position command of the BEST small steam turbine steam compensating valve according to input data of each input end. And the working condition state identification unit 202 is used for determining whether the steam compensating valve needs to be opened or closed according to the running state under each working condition, and outputting a signal for indicating the opening or closing of the steam compensating valve. And the automatic command output unit 203 is used for outputting a valve position command for indicating that the steam compensating valve is in an automatic operation state according to the signal output by the working condition state identification unit 202. The input end of the automatic instruction output unit 203 is connected with the output end of the working condition state recognition unit 202, and the output end of the automatic instruction output unit 203 is connected with the X input end of the analog manual operator unit 201.
And the switching value signal input unit 204 of the command of the eighth step of the start sequence control of the BEST small turbine is used for outputting a switching value signal which indicates whether the eighth step of the start sequence control of the BEST small turbine is triggered or not. The switching value signal input unit 204 of the command of the eight step of the BEST small steam turbine starting sequence control is connected with the ReqA input end of the analog quantity manual operator unit 201. And the eighth step of start sequence control of the BEST small turbine is to check the state of a main valve of the BEST small turbine, power failure of a bypass quick-opening electromagnetic valve, full opening and adjustability of a bypass valve, opening of an exhaust valve, a steam supplementing valve, an overflow valve and a bypass electric door of the BEST small turbine and confirmation of automatic input of the steam supplementing valve.
The ReqA input end of the analog quantity manual operator unit 201 is a switch for switching to an automatic operation state, and if the switching value signal received by the ReqA input end is 1, it indicates that the steam supplement valve is currently in the automatic operation state, that is, the analog quantity manual operator unit 201 takes the value of the X input end as the output valve position instruction of the steam supplement valve. If the switching value signal received by the ReqA input terminal is 0, it indicates that the steam supplement valve is not in the automatic operation state currently, i.e., the X input terminal of the analog manual operator unit 201 is not triggered. The switching value signal input unit 204 of the command of the eighth step of the start sequence control of the BEST small turbine is connected with the ReqA input end of the analog quantity manual operator unit 201, wherein the switching value signal input unit 204 of the command of the eighth step of the start sequence control of the BEST small turbine is 0 before the eighth step of the start sequence control of the BEST small turbine is not triggered, and the switching value signal of the switching value signal input unit 204 of the command of the eighth step of the start sequence control of the BEST small turbine is 1 after the eighth step of the start sequence control of the BEST small turbine is triggered until the start sequence control of the BEST small turbine is completed. That is, before the eight step of start sequence control of the small BEST turbine is triggered, the steam supply valve is not in an automatic operation state, after the eight step of start sequence control of the small BEST turbine is triggered, the steam supply valve is in an automatic operation state, and the analog manual operator unit 201 takes the value of the X input end as the valve position command of the steam supply valve to be output.
And a tracking state identification unit 205, configured to output a signal indicating whether the steam supplement valve is in a tracking state according to the output signal of the operating condition state identification unit 202. The input end of the tracking state recognition unit 205 is connected with the output end of the operating condition state recognition unit 202, and the output end of the tracking state recognition unit 205 is connected with the TS input end of the analog manual operator unit 201. An analog quantity signal output unit 206 of the valve position instruction of the steam compensating valve of the BEST small steam turbine is connected with the signal output end of the analog quantity manual operator unit 201. The analog quantity signal output unit 206 of the valve position command of the steam supply valve of the BEST small turbine is used for controlling the valve position of the steam supply valve.
The TS input end of the analog manual operator unit 201 is a switch in a tracking state, when the switching value signal received by the TS input end is 1, the steam supplement valve is in the tracking state at this time, and the analog manual operator unit 201 takes a tracking value at the TR input end as a valve position instruction of the steam supplement valve. When the switching value signal received by the TS input end is 0, the steam supplementing valve is not in a tracking state. In some embodiments of the present application, the tracking value at the TR input of the analog manual operator unit 201 may be set to 0, that is, if the switching value signal received at the TS input of the analog manual operator unit 201 is 1, the output valve position command is to close the steam supplement valve.
In some embodiments of the present application, as shown in fig. 2, 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 of the manual analog operator module 201, and the preset value in the first constant unit is 0. The ToM input end of the analog manual operator module 201 is a switch for switching to a manual operation state, when the switching value signal received by the ToM input end is 1, the analog manual operator module 201 is in the manual operation state at this time, and when the switching value signal received by the ToM input end is 0, the steam compensating valve is not in the manual operation state at this time, that is, the analog manual operator module 201 is not in the manual operation state. If the preset value in the first constant unit is set to 0, it indicates that the manual control module of the steam supplementing valve cannot be triggered, and the system can automatically control the steam supplementing valve.
In addition, a second constant unit 208 is used for setting a high limit value of the output of the analog manipulator unit. The second constant unit 208 is connected to the MaxOut input of the analog quantity manual operator unit 201. And a third constant unit 209 for setting a lower limit value output by the analog manual operator unit 201. The third constant unit 209 is connected to the miniout input of the analog manual operator unit 201. As an example, the second constant unit 208 sets the upper limit value of the output of the analog manual operation unit 201 to 100, and the third constant unit 209 sets the lower limit value of the output of the analog manual operation unit 201 to 0.
In some embodiments of the present application, as shown in fig. 3, the operating condition state identifying unit 202 includes a switching value signal input module 301 for commanding the start sequence of the small BEST turbine, a switching value signal input module 302 for tripping the small BEST turbine, a switching value signal input module 303 for cutting off the low pressure heater No. 7, a switching value signal input module 304 for fully closing the bypass valve of the small BEST turbine, a switching value signal input module 305 for fully closing the relief valve of the small BEST turbine, an RS trigger module 313, a first non-module 314, a first and module 316, and a first operating condition identifying subunit 202-1.
The first condition identification subunit 202-1 is configured to output a signal indicating whether the exhaust steam pressure satisfies a preset condition according to the exhaust steam pressure of the small turbine BEST under a condition that the No. 8 low pressure heater is cut off or both the No. 8 low pressure heater and the No. 9 low pressure heater are cut off. Whether the exhaust steam pressure meets the preset condition refers to whether a difference between the exhaust steam pressure and a preset backpressure value is smaller than a difference threshold, if the difference between the exhaust steam pressure and the preset backpressure value is smaller than the difference threshold, the first working condition identifying subunit 202-1 outputs a high level signal, and otherwise, the first working condition identifying subunit 202-1 outputs a low level signal.
As shown in fig. 3, a switching value signal input module 301 of the command of the twentieth step of start-up sequence control of the small turbine BEST is connected with the S end of an RS trigger module 313, and a switching value signal input module 302 of trip of the small turbine BEST is connected with the R end of the RS trigger. The switching value signal input module 303 for cutting off the No. 7 low-pressure heater is connected with 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 switching value signal input module 304 for fully closing the BEST small turbine bypass valve, the switching value signal input module 305 for fully closing the BEST small turbine relief valve and the output end of the first working condition identification subunit 202-1 are connected with the input ends of the first and module.
The twentieth step of starting sequence control of the BEST small turbine is the input of No. 8 low-pressure heaters, the input of an overflow valve is automatic, the input of a back pressure controller and a final pressure ratio controller is realized, and the input of a high back pressure limiting value is set. If the twentieth step of the start sequence control of the small turbine in the BEST is triggered, the switching value signal input module 301 of the command of the twentieth step of the start sequence control of the small turbine in the BEST outputs a switching value signal 1, otherwise, the switching value signal 0 is output. If the switching value signal input module 302 of the BEST small turbine tripping outputs the switching value signal 0 and the switching value signal input module 301 of the instructions of the BEST small turbine starting sequence control twentieth step outputs the switching value signal 1, the DV end of the RS trigger outputs the switching value signal 1, otherwise, the DV end of the RS trigger outputs the switching value signal 0. That is, if the twenty-second step of start sequence control of the small BEST turbine is triggered, the small BEST turbine is not tripped, the low-pressure heater No. 7 is not cut off, the bypass valve and the overflow valve of the small BEST turbine are all closed, the low-pressure heater No. 8 is cut off or the low-pressure heaters No. 8 and No. 9 are both cut off, and the exhaust steam pressure meets the preset condition, the operating condition state recognition unit 202 outputs a signal for indicating opening of the steam supply valve of the small BEST turbine, or else, the operating condition state recognition unit 202 outputs a signal for indicating closing of the steam supply valve of the small BEST turbine.
As a possible implementation manner, as shown in fig. 3, the first condition identifying subunit 202-1 includes a switching value signal input module 306 for cutting off the number 8 of low pressure heaters, a switching value signal input module 307 for cutting off the number 9 of low pressure heaters, an analog quantity signal input module 308 for the exhaust pressure of the small BEST turbine, an analog quantity signal input module 309 for the back pressure set value of the small BEST turbine, a first or module 319, a second and module 317, a subtraction module 320, a smaller than module 321, and a third and module 318.
The switching value signal input module 306 for cutting off the No. 8 low-voltage heater and the switching value signal input module 307 for cutting off the No. 9 low-voltage heater are both connected with the input end of the second and module 317, and the output ends of the switching value signal input module 306 for cutting off the No. 8 low-voltage heater and the second and module 317 are both connected with the input end of the first or module 319. An analog quantity signal input module 308 of the exhaust steam pressure of the BEST small turbine is connected with a first input end of a subtraction module 320, an analog quantity signal input module 309 of the backpressure set value of the BEST small turbine is connected with a second input end of the subtraction module 320, and an output end of the subtraction module 320 is connected with an input end of a smaller comparison module 321. The output of the first or module 319 and the output of the smaller comparison module 321 are both connected to the input of a third and module 318, the output of the third and module 318 being connected to the input of the first and module 318.
The analog quantity signal input module 309 of the back pressure set value of the small BEST turbine is used for determining the back pressure set value according to the unit load based on the corresponding relation between the load and the back pressure set value. As an example, fig. 4 is a schematic diagram of a corresponding relationship between the BEST small turbine load and the backpressure set value in the embodiment of the present application, and the analog quantity signal input module 309 of the BEST small turbine backpressure set value determines the backpressure set value corresponding to the BEST small turbine load according to the corresponding relationship shown in fig. 4 and according to the unit load. The subtraction module 320 subtracts the exhaust pressure received by the first input end from the preset backpressure value received by the second input end, and inputs the obtained difference value to be smaller than the module 321. The ratio is smaller than the difference threshold preset in the module 321, for example, the ratio may be smaller than the difference threshold preset in the module 321 by 0.05. If the smaller difference value received by the smaller difference value module 321 is smaller than the preset difference value threshold, the smaller difference value module 321 outputs a switching value signal 1, otherwise, the smaller difference value module 321 outputs a switching value signal 0.
That is, if the difference between the discharge pressure of the small turbine BEST and the back pressure set value is smaller than the difference threshold value in the No. 8 low pressure heater cut-off operation, the first operation identifying subunit 202-1 outputs the switching value signal 1. The first condition identifying subunit 202-1 also outputs the switching value signal 1 if the difference between the exhaust steam pressure of the small turbine BEST and the back pressure set value is smaller than the difference threshold value under the condition that the No. 8 low pressure heater and the No. 9 low pressure heater are both removed.
As shown in fig. 3, 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. The first constant module 310 is configured to set a valve position command corresponding to closing the steam charging valve. The second constant module 311 is used to set a valve position command corresponding to opening the steam supplement valve. The first constant module 310 is connected with a first input end of the analog quantity switching selection module 312, the second constant module 311 is connected with a second input end of the analog quantity switching selection module 312, an output end of the working condition state recognition unit 202 is connected with an EN end of the analog quantity switching selection module 312, and an output end of the analog quantity switching selection module 312 is connected with an X input end of the analog quantity manual operator unit 201. The output end of the operating condition state identifying unit 202 is connected to the EN end of the analog quantity switching selecting 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 selecting module 312.
The preset value in the first constant unit 310 is 0, the preset value in the second constant unit 311 is 100, if the switching value signal output by the first and module 316 is 0, that is, the switching value signal received by the EN end of the analog quantity switching selection module 312 is 0, the output value of the analog quantity selection module 312 is 0, that is, the received value of the X input end of the analog quantity manual operator unit 201 is 0, and if the switching value signal received by the ReqA input end of the analog quantity manual operator unit 201 is 1, the output valve position instruction of the steam supplement valve is to close the steam supplement valve. If the switching value signal output by the first and module 316 is 1, that is, the switching value signal received by the EN end of the analog quantity switching selection module 312 is 1, the output value of the analog quantity selection module 312 is 100, that is, the received value of the X input end of the analog quantity manual operator unit 201 is 100, and if the switching value signal received by the ReqA input end of the analog quantity manual operator unit 201 is 1, the output valve position command of the steam compensation valve is to open the steam compensation valve.
Furthermore, as shown in fig. 3, the first constant module 310 may also be connected to the TR input of the analog quantity manual operator unit 201, that is, the tracking value of the TR input of the analog quantity manual operator unit 201 is 0.
In some embodiments of the present application, as shown in fig. 3, the tracking state identification unit 205 includes a second not module 315 and a pulse module 322. The input end of the second non-module 315 is connected to the output end of the operating condition 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 manual operator unit 201. That is, the input of the second not module 315 is connected to the output of the first and module 316.
The pulse module 322 has a pulse time, for example, the pulse time can be set to 2s, if the first and module 316 outputs the switching value signal 1, the switching value signal output by the pulse module 322 is 0, that is, the switching value signal received by the TS input end of the analog manual operator unit 201 is 0, and the steam supplement valve is not in the tracking state. If the first and module 316 outputs the switching value signal 0, the switching value signal output by the pulse module 322 in the pulse time is 1, the switching value signal received by the TS input end of the manual analog quantity operator unit 201 is 1, the steam compensation valve is in the tracking state, and the valve position command output by the manual analog quantity operator unit 201 is the tracking value of the TR end, that is, the output valve position command is to close the steam compensation valve.
That is, if the start sequence control of the small BEST turbine is not triggered, or the small BEST turbine trips, or the low pressure heater No. 7 is cut off, or a bypass valve full-close signal of the small BEST turbine is not sent, or a relief valve full-close signal of the small BEST turbine is not sent, or a difference between the exhaust steam pressure of the small BEST turbine and the backpressure set value is greater than or equal to a difference threshold value, the first and module 316 outputs a switching value signal 0, the switching value signal received by the TS input end of the analog manual operator unit 201 is 1, that is, the analog manual operator unit 201 is in a tracking state, and the output valve position command is a tracking value 0.
According to the automatic regulating control system of the steam compensating valve of the BEST small steam turbine, the control state of the steam compensating valve of the BEST small steam turbine is determined by combining different working conditions through the working condition state recognition unit, the tracking state recognition unit, the manual state recognition unit and the switching value signal input unit of the command of the eighth step of starting and controlling the BEST small steam turbine, and the corresponding valve position command of the steam compensating valve of the BEST small steam turbine is output through the analog quantity manual operator unit according to the control state of the steam compensating valve, so that the aim of automatic regulation responding according to different working conditions is achieved. The system can be completely suitable for equipment with a small generator of the BEST small steam turbine, can ensure the safe, stable and efficient operation of the BEST small steam turbine, and can also achieve the effects of reducing personnel and improving efficiency.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (8)

1. An automatic regulation control system of a steam supplementing valve of a BEST small steam turbine, which is characterized by comprising:
the analog quantity manual operator unit is used for outputting a valve position instruction of a steam compensating valve of the BEST small steam turbine according to input data of each input end;
the working condition state identification unit is used for determining whether the steam supplementing valve needs to be opened or closed according to the running state under each working condition and outputting a signal for indicating that the steam supplementing valve is opened or closed;
the automatic instruction output unit is used for outputting a valve position instruction used for indicating that the steam supplementing valve is in an automatic operation state according to the signal output by the working condition state identification unit; the input end of the automatic instruction output unit is connected with the output end of the working condition state identification unit, and the output end of the automatic instruction output unit is connected with the X input end of the analog quantity manual operator unit;
the switching value signal input unit is used for outputting a switching value signal which indicates whether the BEST small turbine starting sequential control eighth step is triggered; the switching value signal input unit of the instruction of the eighth step of the start sequence control of the BEST small steam turbine is connected with the ReqA input end of the analog quantity manual operator unit;
the tracking state identification unit is used for outputting a signal for indicating whether the steam supplementing valve is in a tracking state or not according to the output signal of the working condition state identification unit; the input end of the tracking state identification unit is connected with the output end of the working condition state identification unit, and the output end of the tracking state identification unit is connected with the TS input end of the analog quantity manual operator unit;
and an analog quantity signal output unit of a valve position instruction of a steam supplementing valve of the BEST small steam turbine is connected with a signal output end of the analog quantity manual operator unit.
2. The system according to claim 1, wherein the operating condition state identifying unit comprises a switching value signal input module of a command of a twenty-second step of starting sequence control of the BEST small turbine, a switching value signal input module of tripping of the BEST small turbine, a switching value signal input module of cutting off of a No. 7 low-pressure heater, a switching value signal input module of full closing of a bypass valve of the BEST small turbine, a switching value signal input module of full closing of an overflow valve of the BEST small turbine, an RS trigger module, a first non-module, a first AND module and a first operating condition identifying subunit; wherein:
the first working condition identification subunit is used for outputting a signal for indicating whether the steam exhaust pressure meets a preset condition or not according to the steam exhaust pressure of the BEST small steam turbine under the working condition that the No. 8 low-pressure heater is cut off or the No. 8 low-pressure heater and the No. 9 low-pressure heater are both cut off;
the switching value signal input module of the instructions of the twenty-second step of starting sequence control of the BEST small turbine is connected with the S end of the RS trigger module, and the switching value signal input module of tripping of the BEST small turbine is connected with the R end of the RS trigger module;
the switching value signal input module cut off by the No. 7 low-voltage heater is connected with the input end of the first non-module;
the DV end of the RS trigger, the output end of the first non-module, the fully-closed switching value signal input module of the BEST small turbine bypass valve, the fully-closed switching value signal input module of the BEST small turbine overflow valve and the output end of the first working condition identification subunit are connected with the input end of the first and module.
3. The system of claim 2, wherein the first condition identifying subunit comprises a No. 8 low pressure heater cut-off switching value signal input module, a No. 9 low pressure heater cut-off switching value signal input module, an analog quantity signal input module for the discharge pressure of the BEST small turbine, an analog quantity signal input module for the backpressure setting of the BEST small turbine, a first or module, a second and module, a subtraction module, a comparison module, a third and module; wherein:
the switching value signal input module cut off by the No. 8 low-voltage heater and the switching value signal input module cut off by the No. 9 low-voltage heater are both connected with the input end of the second AND module, and the switching value signal input module cut off by the No. 8 low-voltage heater and the output end of the second AND module are both connected with the input end of the first OR module;
the analog quantity signal input module of the exhaust steam pressure of the BEST small steam turbine is connected with the first input end of the subtraction module, the analog quantity signal input module of the backpressure set value of the BEST small steam turbine is connected with the second input end of the subtraction module, and the output end of the subtraction module is connected with the input end of the small comparison module;
the output end of the first or module and the output end of the smaller module are both connected with the input end of the third and module, and the output end of the third and module is connected with the input end of the first and module.
4. The system of claim 1, wherein the automatic command output unit comprises a first constant module, a second constant module, and an analog quantity switching selection module; wherein:
the first constant module is used for setting a valve position instruction corresponding to closing the steam supplementing valve;
the second constant module is used for setting a valve position instruction corresponding to opening the steam supplementing valve;
the first constant module is connected with a first input end of the analog quantity switching selection module; the second constant module is connected with a second input end of the analog quantity switching selection module; the output end of the working condition state identification unit is connected with the EN end of the analog quantity switching selection module; the output end of the analog quantity switching selection module is connected with the X input end of the analog quantity manual operator unit.
5. The system of claim 4, wherein the first constant module is coupled to a TR input of the analog handwheel unit.
6. The system of claim 1, wherein the tracking state identification unit comprises a second non-module and a pulse module; wherein:
the input end of the second non-module is connected with the output end of the working condition state identification unit, the output end of the second non-module is connected with the input end of the pulse module, and the output end of the pulse module is connected with the TS input end of the analog quantity manual operator unit.
7. The system of claim 1, further comprising:
and the first constant unit is connected with the ToM input end of the analog quantity manual operator module, and the preset value in the first constant unit is 0.
8. The system of any one of claims 1-7, further comprising:
the second constant unit is used for setting an upper limit value output by the analog quantity manual operator unit; the second constant unit is connected with a MaxOut input end of the analog quantity manual operator unit;
the third constant unit is used for setting a low limit value output by the analog manual operator unit; and the third constant unit is connected with a MinOut input end of the analog quantity manual operator unit.
CN202211110255.4A 2022-09-13 2022-09-13 Automatic regulation control system of steam supplementing valve of BEST small steam turbine Pending CN115434765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211110255.4A CN115434765A (en) 2022-09-13 2022-09-13 Automatic regulation control system of steam supplementing valve of BEST small steam turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211110255.4A CN115434765A (en) 2022-09-13 2022-09-13 Automatic regulation control system of steam supplementing valve of BEST small steam turbine

Publications (1)

Publication Number Publication Date
CN115434765A true CN115434765A (en) 2022-12-06

Family

ID=84246331

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211110255.4A Pending CN115434765A (en) 2022-09-13 2022-09-13 Automatic regulation control system of steam supplementing valve of BEST small steam turbine

Country Status (1)

Country Link
CN (1) CN115434765A (en)

Similar Documents

Publication Publication Date Title
CN104633638B (en) The integrated control method of the shutdown not blowing out function of power plant FCB
CN108104888B (en) Power grid frequency modulation system and method based on frequency modulation bypass
CN111255536B (en) FCB operation method of gas-steam unit power plant
CN109026688B (en) Pressure regulation optimization redundancy system and method for large industrial air compressor
CN112127960B (en) Steam turbine bypass control method based on full-automatic load shedding working condition
CN109974028B (en) Optimization method for shutdown and non-shutdown of 660MW supercritical coal-fired unit
CN115434765A (en) Automatic regulation control system of steam supplementing valve of BEST small steam turbine
CN206830241U (en) The steam distribution system of steam turbine
CN105317477B (en) Control method for running of control valve point of steam turbine under low load
CN115387863B (en) BEST small steam turbine inlet valve control system based on multi-working-condition automatic undisturbed switching
CN107084011A (en) A kind of nuclear steam turbine method for rapid cooling
EP3425176B1 (en) Waste heat recovery device, internal combustion system, ship, and control method for waste heat recovery device
CN115434764A (en) Overflow valve adjusting and controlling system applied to BEST small steam turbine
CN112902023A (en) Steam pipeline pressurization system and full-automatic control method thereof
CN115450706B (en) Bypass valve adjusting control system based on BEST small steam turbine
CN2674108Y (en) Steam turbine by-pass control system having function for medium pressure cylinder starting
CN110645054B (en) Steam turbine valve sequence switching control method suitable for RB working condition of unit
CN112615571A (en) Frequency conversion and power frequency switching control method for induced draft fan of garbage power plant
CN115341515B (en) Pressure relief device suitable for water supply system with back pressure technology and control method
CN115467719A (en) Control method for load forced landing of steam turbine generator unit
CN208534547U (en) Based on the device for solving the auxiliary vapour main pipe safety door frequent movement of M701F combined cycle unit
CN118188529A (en) Control method and device for sealing water booster pump of feed pump
CN115405382A (en) BEST small steam turbine self-starting control system
CN115751289A (en) Boiler water supply whole-process control method and device based on automatic start-stop control
CN118274313A (en) Intelligent adjustment and distribution control system and method for steam temperature of generator set

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination