CN117537332A - Heat supply bypass control method and device for thermal power generating unit - Google Patents

Heat supply bypass control method and device for thermal power generating unit Download PDF

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Publication number
CN117537332A
CN117537332A CN202311464722.8A CN202311464722A CN117537332A CN 117537332 A CN117537332 A CN 117537332A CN 202311464722 A CN202311464722 A CN 202311464722A CN 117537332 A CN117537332 A CN 117537332A
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China
Prior art keywords
temperature
bypass
index data
low
communication pipe
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CN202311464722.8A
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Chinese (zh)
Inventor
邢智炜
刘磊
杨振勇
康静秋
高明帅
陈振山
尤默
李展
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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Priority to CN202311464722.8A priority Critical patent/CN117537332A/en
Publication of CN117537332A publication Critical patent/CN117537332A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18—Combinations of steam boilers with other apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)

Abstract

The embodiment of the invention provides a heat supply bypass control method and a heat supply bypass control device for a thermal power generating unit, which can be used in the technical field of artificial intelligence, and the method comprises the following steps: acquiring system index data of the thermal power generating unit, wherein the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass; according to bypass index data, controlling the high-side steam flow of the heat supply bypass; according to turbine communication pipe temperature and bypass index data, throw in control to the desuperheating water temperature of heat supply bypass, through controlling the high side steam flow of heat supply bypass and the desuperheating water temperature of heat supply bypass, can promote reliability and the economic nature of regulation, promote unit operating efficiency, real-time supervision parameter guarantees the safe operation of steam turbine.

Description

Heat supply bypass control method and device for thermal power generating unit
Technical Field
The invention relates to the technical field of automatic control of thermal power units, in particular to a heat supply bypass control method and device of a thermal power unit.
Background
At present, the main functions of coal-fired units are changed to frequency modulation and peak shaving, and a large number of units need to be flexibly modified to support the units to carry out deep peak shaving. In winter heating season, the coal-fired unit is required to provide stable heat for the urban heat supply network. Therefore, the thermal decoupling of the coal-fired unit needs to be researched and realized according to the winter operation condition of the coal-fired unit, and the peak regulation lower limit of the unit is reduced while the heat supply capacity is ensured. In the related technology, the common thermoelectric decoupling technology is a bypass heating technology of a high-medium pressure cylinder of a steam turbine, specifically, the automatic adjustment is realized by manually adjusting the heating quantity at the low side, and the high side is automatically adjusted along with the low side, but the condition of bad quality or abrupt change easily occurs at a high side flow measuring point in the mode, so that the abrupt change of the opening degree in the high side adjusting process is caused, the adjusting quality is influenced, even the safe operation of a unit is influenced, and the reliability is poor; the steam with different temperatures can cause economic loss after being mixed, and the running efficiency of the unit is reduced; excessive changes in turbine parameters during automatic adjustment can affect safe operation of the turbine.
Disclosure of Invention
The invention aims to provide a heat supply bypass control method of a thermal power generating unit, which can improve the reliability and economy of adjustment by controlling the high side steam flow of the heat supply bypass and the temperature of the desuperheating water of the heat supply bypass, improve the running efficiency of the unit and monitor parameters in real time to ensure the safe running of a steam turbine. Another object of the present invention is to provide a heating bypass control device of a thermal power generating unit. It is yet another object of the present invention to provide a computer readable medium. It is a further object of the invention to provide a computer device.
In order to achieve the above purpose, the invention discloses a heat supply bypass control method of a thermal power generating unit, which comprises the following steps:
acquiring system index data of the thermal power generating unit, wherein the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass;
according to bypass index data, controlling the high-side steam flow of the heat supply bypass;
and controlling the temperature of the desuperheating water of the heat supply bypass according to the temperature of the turbine communication pipe and bypass index data.
Preferably, the bypass indicator data comprises high bypass indicator data;
according to bypass index data, control the high side steam flow of heat supply bypass, include:
Generating a high side flow calculation value according to the high side index data;
the high side flow calculated value and the obtained high side flow actual value are subjected to weighted calculation through preset flow weight, and a high side flow corrected value is generated;
and controlling the high bypass steam flow of the heating bypass according to the high bypass flow correction value.
Preferably, the high side index data includes a high side pre-temperature, a high side pre-pressure, a high side desuperheating water flow, a high side desuperheating water temperature, a high side desuperheating water pressure, a high side post-temperature and a high side post-pressure;
generating a high side flow calculation value according to the high side index data, including:
generating a high pre-side enthalpy value according to the high pre-side temperature and the high pre-side pressure;
generating a high-side desuperheating water enthalpy value according to the high-side desuperheating water temperature and the high-side desuperheating water pressure;
generating a high-side post enthalpy value according to the high-side post temperature and the high-side post pressure;
and generating a high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
Preferably, the bypass index data comprises high side index data and low side index data, and the temperature of the turbine communication pipe comprises the temperature of the high-pressure cylinder communication pipe and the temperature of the middle-low pressure cylinder communication pipe;
According to turbine communication pipe temperature and bypass index data, carry out input control to the desuperheating water temperature of heat supply bypass, include:
in the automatic throwing stage, according to the high-side index data and the high-pressure cylinder communication pipe temperature, the high-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the high-side temperature reduction water is completed;
and in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, the low-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the low-side temperature reduction water is completed.
Preferably, the high side index data includes a high side desuperheating water temperature;
according to the high side index data and the high pressure cylinder communicating pipe temperature, the high side attemperation water is subjected to temperature regulation according to a preset regulation rate, and the input control of the high side attemperation water is completed, and the method comprises the following steps:
if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is larger than a preset first temperature threshold, determining the high-pressure cylinder communication pipe temperature as a high-side temperature-reducing water target temperature;
according to the regulation rate, regulating the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water;
if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller than or equal to a first temperature threshold value, acquiring the steam temperature after the high-side valve;
The high bypass attemperation water temperature is set to the high bypass valve post-vapor temperature.
Preferably, the low side index data includes low side desuperheated water temperature;
according to low side index data and the temperature of a communication pipe of a middle and low pressure cylinder, temperature adjustment is carried out on low side temperature reduction water according to a preset adjustment rate, and input control of the low side temperature reduction water is completed, and the method comprises the following steps:
if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is larger than a preset second temperature threshold, determining the temperature of the middle-low pressure cylinder communication pipe as the low-side temperature-reducing water target temperature;
according to the regulation rate, regulating the temperature of the low-side desuperheating water to the target temperature of the low-side desuperheating water;
if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller than or equal to a second temperature threshold value, acquiring the steam temperature after the low-side valve;
the low bypass attemperation water temperature is set to the low bypass valve post-steam temperature.
Preferably, the method further comprises:
acquiring the controlled unit operation parameters according to a preset time interval;
carrying out hierarchical protection triggering judgment on the heat supply bypass according to set operation parameters by using a set hierarchical protection strategy to obtain a triggering result;
if the triggering result is triggering hierarchical protection, determining a protection level, executing protection actions corresponding to the protection level, and continuing to execute steps of acquiring the controlled unit operation parameters according to a preset time interval, wherein the protection level comprises a locking level, an override level and a bypass protection level, the protection actions corresponding to the locking level are locking actions, the protection actions corresponding to the override level are override actions, and the protection actions corresponding to the bypass protection level are bypass closing actions.
The invention also discloses a heat supply bypass control device of the thermal power generating unit, which comprises:
the first acquisition unit is used for acquiring system index data of the thermal power generating unit, wherein the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass;
the flow control unit is used for controlling the high-side steam flow of the heat supply bypass according to the bypass index data;
and the input control unit is used for controlling the input of the temperature of the desuperheating water of the heat supply bypass according to the temperature of the communication pipe of the steam turbine and the bypass index data.
Preferably, the bypass indicator data comprises high bypass indicator data;
the flow control unit is specifically used for generating a high-side flow calculation value according to the high-side index data; the high side flow calculated value and the obtained high side flow actual value are subjected to weighted calculation through preset flow weight, and a high side flow corrected value is generated; and controlling the high bypass steam flow of the heating bypass according to the high bypass flow correction value.
Preferably, the high side index data includes a high side pre-temperature, a high side pre-pressure, a high side desuperheating water flow, a high side desuperheating water temperature, a high side desuperheating water pressure, a high side post-temperature and a high side post-pressure;
The flow control unit is specifically used for generating a high bypass front enthalpy value according to the high bypass front temperature and the high bypass front pressure; generating a high-side desuperheating water enthalpy value according to the high-side desuperheating water temperature and the high-side desuperheating water pressure; generating a high-side post enthalpy value according to the high-side post temperature and the high-side post pressure; and generating a high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
Preferably, the bypass index data comprises high side index data and low side index data, and the temperature of the turbine communication pipe comprises the temperature of the high-pressure cylinder communication pipe and the temperature of the middle-low pressure cylinder communication pipe;
the input control unit is specifically used for carrying out temperature adjustment on the high-side desuperheating water according to preset adjustment rate and high-side index data and the temperature of the high-pressure cylinder communication pipe in an automatic input stage so as to complete input control on the high-side desuperheating water; and in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, the low-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the low-side temperature reduction water is completed.
Preferably, the high side index data includes a high side desuperheating water temperature;
the input control unit is specifically configured to determine the high-pressure cylinder communication pipe temperature as the high-side temperature reduction water target temperature if the temperature deviation between the high-side temperature reduction water temperature and the high-pressure cylinder communication pipe temperature is greater than a preset first temperature threshold; according to the regulation rate, regulating the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water; if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller than or equal to a first temperature threshold value, acquiring the steam temperature after the high-side valve; the high bypass attemperation water temperature is set to the high bypass valve post-vapor temperature.
Preferably, the low side index data includes low side desuperheated water temperature;
the input control unit is specifically configured to determine the temperature of the middle and low pressure cylinder communication pipe as the low-side temperature reduction water target temperature if the temperature deviation between the low-side temperature reduction water temperature and the temperature of the middle and low pressure cylinder communication pipe is greater than a preset second temperature threshold; according to the regulation rate, regulating the temperature of the low-side desuperheating water to the target temperature of the low-side desuperheating water; if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller than or equal to a second temperature threshold value, acquiring the steam temperature after the low-side valve; the low bypass attemperation water temperature is set to the low bypass valve post-steam temperature.
Preferably, the apparatus further comprises:
the second acquisition unit is used for acquiring the controlled unit operation parameters according to the preset time interval;
the grading protection judging unit is used for carrying out grading protection triggering judgment on the heat supply bypass according to the set grading protection strategy and the unit operation parameters to obtain a triggering result;
and the protection action executing unit is used for determining a protection level if the triggering result is triggering grading protection, executing the protection action corresponding to the protection level, triggering the second acquiring unit to continuously execute the step of acquiring the controlled unit operation parameters according to the preset time interval, wherein the protection level comprises a locking level, an override level and a bypass protection level, the protection action corresponding to the locking level is used as the locking action, the protection action corresponding to the override level is used as the override action, and the protection action corresponding to the bypass protection level is used as the bypass closing action.
The invention also discloses a computer readable medium having stored thereon a computer program which when executed by a processor implements a method as described above.
The invention also discloses a computer device comprising a memory for storing information comprising program instructions and a processor for controlling the execution of the program instructions, the processor implementing the method as described above when executing the program.
The invention also discloses a computer program product comprising a computer program/instruction which, when executed by a processor, implements a method as described above.
The method comprises the steps of obtaining system index data of a thermal power generating unit, wherein the system index data comprise turbine communication pipe temperature and bypass index data of a heat supply bypass; according to bypass index data, controlling the high-side steam flow of the heat supply bypass; according to turbine communication pipe temperature and bypass index data, throw in control to the desuperheating water temperature of heat supply bypass, through controlling the high side steam flow of heat supply bypass and the desuperheating water temperature of heat supply bypass, can promote reliability and the economic nature of regulation, promote unit operating efficiency, real-time supervision parameter guarantees the safe operation of steam turbine.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a heat supply bypass control method of a thermal power generating unit provided by an embodiment of the invention;
FIG. 2 is a flowchart of a heat supply bypass control method of a thermal power generating unit according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heat supply bypass control device of a thermal power generating unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the heat supply bypass control method and device of the thermal power generating unit disclosed by the application can be used in the technical field of artificial intelligence, and also can be used in any field except the technical field of artificial intelligence, and the application field of the heat supply bypass control method and device of the thermal power generating unit disclosed by the application is not limited.
In order to facilitate understanding of the technical solutions provided in the present application, the following description will first explain relevant content of the technical solutions of the present application. The bypass heat supply technology of the steam turbine is that main and reheat steam is subjected to temperature and pressure reduction and then enters a heat supply network heater through a bypass to supply heat, so that the heat supply capacity of a unit is increased; and after bypass heat supply is put into operation, the lower limit of the output of the steam turbine can be reduced, so that thermal decoupling is realized, and the lower limit of the deep peak regulation load of the unit is reduced. The temperature and pressure of the turbine are regulated through a turbine bypass in the starting stage of the unit, the turbine is controlled to perform the flushing and grid connection, and the coal-fired unit is generally configured with a bypass with the capacity of 30% -50% for use in the starting process of the unit. Therefore, the unit is reformed by adopting a bypass heating technology, and the whole unit only needs less reforming investment.
Under the normal operation condition of the unit, the bypass heat supply quantity can be adjusted through the change of the opening degrees of the high side and the low side. The bypass heat supply and the steam turbine steam extraction heat supply together provide a heat source for the urban heat supply network. However, the electric load of the unit needs to be changed and adjusted in real time along with the power grid demand, so that the steam extraction and heat supply quantity of the unit also changes, and the bypass opening of the unit also needs to be changed so as to adjust the bypass heat supply quantity, and the basic stability of the overall heat supply quantity of the unit is ensured.
Aiming at the coal motor unit for completing the bypass heat supply transformation, the invention improves the control function of the heat supply bypass by proposing a control optimization scheme containing a series of contents, optimizes the bypass automatic regulating loop from the aspects of reliability of a regulating object, economy of regulation, safety guarantee of the unit and the like, and ensures the control effect of the heat supply bypass and the safe operation of the unit.
The implementation process of the heat supply bypass control method of the thermal power generating unit provided by the embodiment of the invention is described below by taking a heat supply bypass control device of the thermal power generating unit as an execution main body as an example. It can be understood that the execution main body of the heat supply bypass control method of the thermal power generating unit provided by the embodiment of the invention comprises, but is not limited to, a heat supply bypass control device of the thermal power generating unit.
Fig. 1 is a flowchart of a heat supply bypass control method of a thermal power generating unit according to an embodiment of the present invention, as shown in fig. 1, the method includes:
step 101, acquiring system index data of a thermal power generating unit, wherein the system index data comprises turbine communication pipe temperature and bypass index data of a heat supply bypass.
And 102, controlling the high-bypass steam flow of the heat supply bypass according to bypass index data.
And 103, controlling the temperature of the desuperheating water of the heat supply bypass according to the temperature of the communication pipe of the steam turbine and bypass index data.
In the technical scheme provided by the embodiment of the invention, system index data of a thermal power unit are acquired, wherein the system index data comprise the temperature of a turbine communication pipe and bypass index data of a heat supply bypass; according to bypass index data, controlling the high-side steam flow of the heat supply bypass; according to turbine communication pipe temperature and bypass index data, throw in control to the desuperheating water temperature of heat supply bypass, through controlling the high side steam flow of heat supply bypass and the desuperheating water temperature of heat supply bypass, can promote reliability and the economic nature of regulation, promote unit operating efficiency, real-time supervision parameter guarantees the safe operation of steam turbine.
Fig. 2 is a flowchart of a heat supply bypass control method of a thermal power generating unit according to another embodiment of the present invention, as shown in fig. 2, the method includes:
step 201, acquiring system index data of a thermal power generating unit.
In the embodiment of the invention, each step is executed by a heat supply bypass control device of the thermal power generating unit.
In the embodiment of the invention, the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass, the bypass index data comprises high-side index data and low-side index data, and the temperature of the turbine communication pipe comprises the temperature of a high-pressure cylinder communication pipe and the temperature of a medium-pressure cylinder communication pipe and a low-pressure cylinder communication pipe. The system index data may be obtained by actual measurement.
And 202, generating a high-side flow calculation value according to the high-side index data.
In an embodiment of the invention, the high-side index data includes, but is not limited to, a high-side pre-temperature, a high-side pre-pressure, a high-side desuperheating water flow, a high-side desuperheating water temperature, a high-side desuperheating water pressure, a high-side post-temperature, and a high-side post-pressure.
In the embodiment of the present invention, step 202 specifically includes:
step 2021, generating a high pre-side enthalpy value based on the high pre-side temperature and the high pre-side pressure.
In the embodiment of the invention, the high side front temperature and the high side front pressure are obtained by measuring the high side front measuring point; and calculating according to the high side front temperature and the high side front pressure to generate a high side front enthalpy value.
Step 2022, generating the enthalpy value of the high-side desuperheating water according to the high-side desuperheating water temperature and the high-side desuperheating water pressure.
In the embodiment of the invention, the temperature and the pressure of the high-side desuperheating water can be obtained by actual measurement; and calculating according to the high-side desuperheating water temperature and the high-side desuperheating water pressure to generate the high-side desuperheating water enthalpy value.
Step 2023, generating a high post-side enthalpy value based on the high post-side temperature and the high post-side pressure.
In the embodiment of the invention, the high-side post-temperature and the high-side post-pressure are obtained by measuring the high-side post-measuring point; and calculating according to the high-side post-temperature and the high-side post-pressure to generate a high-side post-enthalpy value.
And 2024, generating a high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
In the embodiment of the invention, the energy balance can be known as follows:
Q 1 H 1 + Q 3 H 3＝ ( Q 1 + Q 3 ) H 2
and further carrying out formula transformation to obtain:
wherein Q is 1 For high side front flow, Q 3 For the flow of the high-side temperature-reducing water, H 1 For a high side enthalpy value, H 2 Is the high side post enthalpy value, H 3 Is the enthalpy value of the high-side desuperheating water.
And 203, carrying out weighted calculation on the high side flow calculated value and the obtained high side flow actual value through preset flow weight to generate a high side flow corrected value.
In the embodiment of the present invention, the flow weight includes a flow calculated value weight and a flow actual value weight, which may be set according to actual requirements, which is not limited in the embodiment of the present invention.
Specifically, according to the flow calculated value weight and the flow actual value weight, the high bypass flow calculated value and the acquired high bypass flow actual value are subjected to weighted calculation, and a high bypass flow correction value is generated.
And 204, controlling the high bypass steam flow of the heat supply bypass according to the high bypass flow correction value.
In the embodiment of the invention, the high side steam flow is adjusted to be the high side flow correction value by adjusting the high side valve of the heat supply bypass.
In the embodiment of the invention, for the unit for carrying out bypass heat supply transformation, the bypass needs to simultaneously act on the start-stop stage and the bypass heat supply stage of the steam turbine. Therefore, the high-side regulation scheme needs to be optimized, and the bypass heating state is utilized to switch the high-side regulation loop. When the bypass heating state is not input, the high side is used as a starting bypass to control the pressure of main steam before the steam turbine. When the bypass heating state is input; the high side is used as a heat supply bypass, and the main steam flow before the high side is regulated.
The invention considers that the newly added flow measurement points before the high side can cause larger disturbance to the adjustment of the high side heating state, even sudden full-open or full-close, and seriously affects the safe and stable operation of the unit, thereby increasing the calculated value of the flow before the high side, carrying out weighting treatment with the measured value of the flow, and weakening the influence of the faults of the flow measurement points.
And 205, in the automatic throwing stage, according to the high-side index data and the high-pressure cylinder communication pipe temperature, carrying out temperature adjustment on the high-side temperature reduction water according to a preset adjustment rate, and completing throwing control on the high-side temperature reduction water.
In the embodiment of the invention, the high-side index data comprise the high-side temperature reduction water temperature, and the high-side temperature reduction water temperature can be obtained by actual measurement.
In the embodiment of the invention, the automatic feeding stage is to mix main steam with the exhaust steam of the high-pressure cylinder and then enter the boiler reheater under the working condition of initial opening of the high side and the low side for feeding heat. As an alternative, the dosing phase is 20 minutes (min).
In the embodiment of the present invention, step 205 specifically includes:
step 2051, judging whether the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is greater than a preset first temperature threshold value, and if so, executing step 2052; if not, go to step 2054.
In the embodiment of the present invention, the first temperature threshold may be set according to actual requirements, which is not limited in the embodiment of the present invention.
In the embodiment of the present invention, if the temperature deviation between the high-side desuperheating water temperature and the high-pressure cylinder communication pipe temperature is greater than the first temperature threshold, it indicates that the temperature deviation between the high-side desuperheating water temperature and the high-pressure cylinder communication pipe temperature is greater, and step 2052 is continuously executed; if the temperature deviation between the high-side desuperheating water temperature and the high-pressure cylinder communication pipe temperature is less than or equal to the first temperature threshold, the step 2054 is continuously executed, which indicates that the temperature deviation between the high-side desuperheating water temperature and the high-pressure cylinder communication pipe temperature is less.
And step 2052, determining the temperature of the high-pressure cylinder communication pipe as the target temperature of the high-side desuperheating water.
In the embodiment of the invention, the temperature of the high-pressure cylinder communication pipe is tracked, the logic for setting the high-side temperature reduction water temperature is optimized, the high-pressure cylinder communication pipe temperature is used as the high-side temperature reduction water target temperature, and the heat economy of steam mixing is improved.
Step 2053, adjusting the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water according to the adjustment rate, and ending the step.
In the embodiment of the invention, the adjusting speed can be set according to actual demands, so that the temperature of the high-side temperature is gradually adjusted to the temperature of the high-pressure cylinder communication pipe by the temperature reducing water adjusting circuit.
Step 2054, obtaining the steam temperature after the high side valve.
In the embodiment of the invention, if the temperature deviation between the high-side desuperheating water temperature and the high-pressure cylinder communication pipe temperature is smaller, the steam temperature after the high-side valve is obtained by measurement.
Step 2055, setting the high bypass attemperation water temperature to the high bypass valve post-vapor temperature.
In the embodiment of the invention, as the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller, after the high-side temperature-reducing water loop is put into automation, an operator can manually modify and adjust the high-side temperature-reducing water temperature.
In the embodiment of the invention, under the working conditions of initial opening of the high side and the low side for heating, main steam and high pressure cylinder exhaust steam are mixed and enter the boiler reheater, and logic setting of high side desuperheating water adjustment is optimized for ensuring the heat economy of steam mixing, namely: the set value of the automatic early casting device tracks the steam exhaust temperature of the high-pressure cylinder within 20 minutes before automatic early casting; after 20min, the operation is switched to be manually input and adjusted by operators.
And 206, in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, carrying out temperature adjustment on the low-side temperature reduction water according to a preset adjustment rate, and completing the throwing control of the low-side temperature reduction water.
In the embodiment of the invention, the low-side index data comprise low-side temperature-reducing water temperature, and the low-side temperature-reducing water temperature can be obtained by actual measurement.
In the embodiment of the invention, the automatic feeding stage is to mix main steam with the exhaust steam of the high-pressure cylinder and then enter the boiler reheater under the working condition of initial opening of the high side and the low side for feeding heat. As an alternative, the dosing phase is 20 minutes (min).
In the embodiment of the present invention, step 206 specifically includes:
step 2061, judging whether the temperature deviation between the low-side desuperheating water temperature and the temperature of the middle-low pressure cylinder communication pipe is larger than a preset second temperature threshold value, if so, executing step 2062; if not, go to step 2064.
In the embodiment of the present invention, the second temperature threshold may be set according to actual requirements, which is not limited in the embodiment of the present invention. As an alternative, the second temperature threshold is the same as the first temperature threshold.
In the embodiment of the present invention, if the temperature deviation between the low-side temperature-reducing water temperature and the middle-low pressure cylinder communication pipe temperature is greater than the second temperature threshold, it indicates that the temperature deviation between the low-side temperature-reducing water temperature and the middle-low pressure cylinder communication pipe temperature is greater, and step 2062 is continuously executed; if the temperature deviation between the low-side desuperheating water temperature and the middle-low pressure cylinder communication pipe temperature is less than or equal to the second temperature threshold, it indicates that the temperature deviation between the low-side desuperheating water temperature and the middle-low pressure cylinder communication pipe temperature is less, and step 2064 is continued.
And 2062, determining the temperature of the middle-low pressure cylinder communication pipe as the low-side desuperheating water target temperature.
In the embodiment of the invention, after the low side of the heat supply is opened, the low side heat supply steam and the five-section steam extraction heat supply steam jointly enter the heat supply network heater. And when the initial throwing of the low-side temperature-reducing water is automatically performed for 20 minutes, the controlled object is switched to the temperature of the communication pipe of the middle and low pressure cylinders of the steam turbine, the temperature of the communication pipe of the low pressure cylinders is tracked, and the steam discharge temperature of the middle pressure cylinders is represented by using the temperature of the communication pipe. Thereby reducing the mixed temperature difference of low side heat supply and steam extraction heat supply.
And 2063, adjusting the low-side desuperheating water temperature to the low-side desuperheating water target temperature according to the adjustment rate.
In the embodiment of the invention, the adjusting speed can be set according to actual demands, so that the low-side temperature is gradually adjusted to the temperature of the communication pipe of the middle and low pressure cylinders by the temperature reducing water adjusting circuit.
Step 2064, obtaining the low by-pass valve post-vapor temperature.
In the embodiment of the invention, if the temperature deviation between the low-side desuperheating water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller, the steam temperature after the low-side valve is obtained is measured.
Step 2065, setting the low bypass attemperation water temperature to the low bypass valve post-steam temperature.
In the embodiment of the invention, as the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communicating pipe is smaller, after the low-side temperature-reducing water loop is put into automation, an operator can manually modify and adjust the low-side temperature-reducing water temperature, and the regulation of bypass heat supply quantity and high-side front flow is realized through Proportional Integral Derivative (PID) operation.
Step 207, obtaining the controlled unit operation parameters according to the preset time interval.
In the embodiment of the invention, in the process of adjusting the heat supply bypass, the axial thrust and the steam inlet condition of the steam turbine are influenced, so that the change of the running parameters of the steam turbine can be caused. When the change of the main operating parameters of the steam turbine affects the safety of the unit, the invention realizes the hierarchical control of the bypass before the protection action by setting the locking and override logic of the bypass in a hierarchical way, thereby ensuring the operation safety of the unit.
In the embodiment of the present invention, the time interval may be set according to actual requirements, which is not limited in the embodiment of the present invention.
In an embodiment of the present invention, the controlled unit operating parameters include, but are not limited to, high discharge pressure, high pressure ratio (obtained by dividing the regulated stage pressure by the high discharge pressure), four-pump pressure, five-pump pressure, medium pressure ratio (obtained by dividing the reheat steam pressure by the medium discharge pressure), high pressure cylinder discharge temperature, high side front steam flow, low side front steam flow for heat supply, low side rear steam temperature for heat supply, low side rear steam flow for heat supply, high side rear steam flow, main steam pressure, slip pressure set point, one-pump pressure, and two-pump pressure.
Step 208, performing hierarchical protection triggering judgment on the heating bypass according to the set operation parameters by using the set hierarchical protection strategy to obtain a triggering result, and executing step 209 if the triggering result is triggering hierarchical protection; if the triggering result is that the grading protection is not triggered, the process is ended.
In the embodiment of the invention, the hierarchical protection strategy can be set according to actual requirements. As an alternative, the protection levels include a lockout level, an override level, and a bypass protection level, and the design principle of the hierarchical protection policy is: the locking level is triggered preferentially, and under the condition that the control effect of the unit operation parameters is still not ideal after the locking action is executed, the override level is triggered, and the override action is executed; and if the change access of the turbine parameters is not changed after the override level is triggered, finally triggering the bypass protection level.
The locking action comprises locking opening and locking closing, and can directly act on the PID regulator and the M/A manual station. As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, performing the high bypass latch opening action:
a1, the high-discharge pressure is more than 5.2MPa;
b1, the high-voltage ratio is smaller than a preset alarm fixed value;
c1, the difference between the four-pump pressure and the five-pump pressure is more than 0.52MPa;
d1, the medium voltage ratio is larger than a preset alarm fixed value;
e1, the exhaust temperature of the high-pressure cylinder is more than 410 ℃;
f1, the difference between the high side front steam flow and the heat supply low side front steam flow is more than 50t/h;
g1, the steam flow after high side is more than 370t/h;
the difference value between the H1, the main steam pressure and the slip pressure set value is smaller than-1.2 MPa.
As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, the high bypass latch closing action is performed:
a2, the high-voltage ratio is larger than a preset alarm fixed value;
b2, the difference between the primary pumping pressure and the secondary pumping pressure is more than 2MPa;
c2, the medium voltage ratio is smaller than a preset alarm fixed value;
d2, the difference between the main steam pressure and the sliding pressure set value is larger than-1.2 MPa;
E2, the difference value between the high side front steam flow and the heat supply low side front steam flow is more than 170t/h;
and F2, the steam flow after the high side is smaller than a preset alarm fixed value.
As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, the low bypass latch opening action is performed:
a3, the high-voltage ratio is larger than a preset alarm fixed value;
b3, the difference between the first pumping pressure and the second pumping pressure is more than 2MPa;
c3, the medium voltage ratio is smaller than a preset alarm fixed value;
d3, steam flow is more than 435t/h after low side heat supply;
e3, the difference value between the high side front steam flow and the heat supply low side front steam flow is larger than 270t/h;
f3, the temperature of the steam after low side heat supply is higher than 270 ℃.
As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, the low bypass latch closing action is performed:
a4, the high-discharge pressure is more than 5.2MPa;
b4, the high-voltage ratio is smaller than a preset alarm fixed value;
the difference value between the four-pump pressure and the five-pump pressure is more than 0.52MPa;
d4, the medium voltage ratio is larger than a preset alarm fixed value;
e4, the exhaust temperature of the high-pressure cylinder is more than 410 ℃;
F4, the difference between the high side front steam flow and the heat supply low side front steam flow is more than 50t/h;
and G4, the temperature of the steam after low side heat supply is smaller than a preset alarm fixed value.
Further, for the bypass heating working condition, as the operation working condition of the steam turbine changes, the safe operation of the unit is affected to a certain extent, and the high-side control strategy needs to be optimized according to the unit protection logic, the override level is increased, and the override action is executed. By the pressure difference of the extraction; the exhaust temperature and pressure of the high-pressure cylinder; high and medium pressure ratio; the high discharge pressure equal boundary adjustment overrides the logic setting.
As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, the high bypass on 5% and the low bypass on 5% actions are performed:
a5, the difference between the four-pump pressure and the five-pump pressure is more than 0.62MPa;
b5, the steam exhaust temperature of the high-pressure cylinder is higher than 420 ℃;
c5, the high-pressure ratio is less than 3.03;
d5, the medium-pressure ratio is larger than 11.76;
e5, the high discharge pressure is more than 5.3MPa.
As an alternative, if the unit operation parameter of the thermal power unit in the bypass heating state satisfies one of the following conditions, the high bypass 5% on and the low bypass 5% off actions are performed:
A6, the difference between the primary pumping pressure and the secondary pumping pressure is more than 2.38MPa;
b6, the high-pressure ratio is larger than 4.54;
c6, the medium-pressure ratio is smaller than 6.90.
Further, when the override action is triggered, the unit operating parameters reach the bypass protection level condition, namely: the control effect is still not ideal and the protection action is triggered. As an alternative, if the temperature of the steam after high side is higher than 430 ℃, delaying for 5s; or the difference between the high side front steam flow and the low side front steam flow is more than 60t/h, and the time delay is 5s; or the difference between the low side front steam flow and the high side front steam flow is more than 190t/h, and the time delay is 5s, and the bypass protection level is triggered.
In the embodiment of the present invention, if the trigger result is triggering hierarchical protection, which indicates that the current running state of the unit has a potential safety hazard, step 209 is executed; if the triggering result is that the grading protection is not triggered, the current running state of the unit is indicated that potential safety hazards do not exist, and the process is ended.
Step 209, determining a protection level, executing a protection action corresponding to the protection level, and continuing to execute step 207.
In the embodiment of the invention, the protection levels comprise a locking level, an override level and a bypass protection level, wherein the protection action corresponding to the locking level is used as a locking action, the protection action corresponding to the override level is used as an override action, and the protection action corresponding to the bypass protection level is used as a bypass closing action.
Specifically, the protection level is determined through the hierarchical protection strategy, the protection action corresponding to the protection level is executed, and the step 207 is continuously executed, and the operation parameters are continuously monitored until it is determined that the potential safety hazard does not exist in the current operation state of the unit.
In the embodiment of the invention, the locking actions comprise locking opening and locking closing, and the locking opening comprises a high side locking opening action and a low side locking opening action; the latch closure includes a high side latch closure action and a low side latch closure action; the override actions include a high side override off 5% and low side override on 5% action and a high side override on 5% and low side override off 5% action; the bypass closing action comprises the step of quickly closing a bypass valve, so that the operation safety of the steam turbine and the system is ensured.
It is worth to say that, after the override logic is triggered, in order to reduce the disturbance to the bypass control, the opening of the bypass with 5% -10% of high and low actions is executed at the same time, the bypass protection action is avoided being triggered, the unit disturbance is reduced, the unit safety is guaranteed, meanwhile, the thought of 'fast-acting and slow-returning' is adopted, namely, when the override condition is triggered, the bypass acts fast, and when the override condition is recovered, the bypass recovers the override action slowly. Specifically, when the override action is executed, the action rate is not set, and the 'quick action' function is realized; when the override action is restored, a certain action rate is set, and a slow-return function is realized, so that the override action of fast-action slow-return is realized by setting the action rate.
Aiming at the control of the bypass after the bypass of the coal-fired unit is reformed, the invention provides an optimized control scheme in a targeted way from the aspects of treatment of a high-bypass front flow measuring point, setting of a bypass temperature reduction water setting value, locking override control of the bypass and the like, and provides a complete and perfect heat supply bypass control strategy; the implementation method is simple and convenient, is convenient for configuration implementation in a Distributed Control System (DCS), and has low cost and small risk; by optimizing the bypass automatic loop in logic, the reliability, economy and safety of the heating bypass control are improved.
It is worth to be noted that, in the technical scheme in the application, the acquisition, storage, use, processing and the like of the data all conform to relevant regulations of legal regulations. The user information in the embodiment of the application is obtained through legal compliance approaches, and the user information is obtained, stored, used, processed and the like through client authorization consent.
In the technical scheme of the heat supply bypass control method of the thermal power generating unit, system index data of the thermal power generating unit are obtained, wherein the system index data comprise the temperature of a turbine communication pipe and bypass index data of a heat supply bypass; according to bypass index data, controlling the high-side steam flow of the heat supply bypass; according to turbine communication pipe temperature and bypass index data, throw in control to the desuperheating water temperature of heat supply bypass, through controlling the high side steam flow of heat supply bypass and the desuperheating water temperature of heat supply bypass, can promote reliability and the economic nature of regulation, promote unit operating efficiency, real-time supervision parameter guarantees the safe operation of steam turbine.
Fig. 3 is a schematic structural diagram of a heat supply bypass control device of a thermal power generating unit according to an embodiment of the present invention, where the device is configured to execute the heat supply bypass control method of a thermal power generating unit, as shown in fig. 3, and the device includes: a first acquisition unit 11, a flow control unit 12, and a throw-in control unit 13.
The first obtaining unit 11 is configured to obtain system index data of the thermal power generating unit, where the system index data includes a turbine communication pipe temperature and bypass index data of a heat supply bypass.
The flow control unit 12 is used for controlling the high bypass steam flow of the heat supply bypass according to the bypass index data.
The input control unit 13 is used for controlling the input of the temperature of the desuperheating water of the heat supply bypass according to the temperature of the turbine communication pipe and bypass index data.
In the embodiment of the invention, the bypass index data comprises high bypass index data; the flow control unit 12 is specifically configured to generate a high-side flow calculation value according to the high-side index data; the high side flow calculated value and the obtained high side flow actual value are subjected to weighted calculation through preset flow weight, and a high side flow corrected value is generated; and controlling the high bypass steam flow of the heating bypass according to the high bypass flow correction value.
In the embodiment of the invention, the high-side index data comprise high-side front temperature, high-side front pressure, high-side desuperheating water flow, high-side desuperheating water temperature, high-side desuperheating water pressure, high-side rear temperature and high-side rear pressure; the flow control unit 12 is specifically configured to generate a high pre-side enthalpy value according to the high pre-side temperature and the high pre-side pressure; generating a high-side desuperheating water enthalpy value according to the high-side desuperheating water temperature and the high-side desuperheating water pressure; generating a high-side post enthalpy value according to the high-side post temperature and the high-side post pressure; and generating a high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
In the embodiment of the invention, the bypass index data comprise high side index data and low side index data, and the temperature of the turbine communication pipe comprises the temperature of the high-pressure cylinder communication pipe and the temperature of the medium-low pressure cylinder communication pipe; the input control unit 13 is specifically configured to perform temperature adjustment on the high-side desuperheating water according to a preset adjustment rate and according to the high-side index data and the high-pressure cylinder communication pipe temperature in an automatic input stage, so as to complete input control on the high-side desuperheating water; and in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, the low-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the low-side temperature reduction water is completed.
In the embodiment of the invention, the high-side index data comprises the temperature of high-side desuperheating water; the input control unit 13 is specifically configured to determine the high-pressure cylinder communication pipe temperature as the high-side temperature reduction water target temperature if the temperature deviation between the high-side temperature reduction water temperature and the high-pressure cylinder communication pipe temperature is greater than a preset first temperature threshold; according to the regulation rate, regulating the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water; if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller than or equal to a first temperature threshold value, acquiring the steam temperature after the high-side valve; the high bypass attemperation water temperature is set to the high bypass valve post-vapor temperature.
In the embodiment of the invention, the low-side index data comprises low-side temperature-reducing water temperature; the input control unit 13 is specifically configured to determine the temperature of the low-side temperature-reducing water as the low-side temperature-reducing water target temperature if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is greater than a preset second temperature threshold; according to the regulation rate, regulating the temperature of the low-side desuperheating water to the target temperature of the low-side desuperheating water; if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller than or equal to a second temperature threshold value, acquiring the steam temperature after the low-side valve; the low bypass attemperation water temperature is set to the low bypass valve post-steam temperature.
In the embodiment of the invention, the device further comprises: a second acquisition unit 14, a hierarchical protection discrimination unit 15, and a protection action execution unit 16.
The second obtaining unit 14 is configured to obtain the controlled unit operation parameter according to a preset time interval.
The hierarchical protection discriminating unit 15 is configured to perform hierarchical protection triggering discrimination on the heating bypass according to the set operation parameters by using the set hierarchical protection policy, so as to obtain a triggering result.
The protection action execution unit 16 is configured to determine a protection level if the trigger result is triggering hierarchical protection, execute a protection action corresponding to the protection level, and trigger the second acquisition unit 14 to continue to execute a step of acquiring the controlled unit operation parameter according to a preset time interval, where the protection level includes a blocking level, an override level, and a bypass protection level, the protection action corresponding to the blocking level is a blocking action, the protection action corresponding to the override level is an override action, and the protection action corresponding to the bypass protection level is a bypass closing action.
In the scheme of the embodiment of the invention, system index data of a thermal power unit is acquired, wherein the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass; according to bypass index data, controlling the high-side steam flow of the heat supply bypass; according to turbine communication pipe temperature and bypass index data, throw in control to the desuperheating water temperature of heat supply bypass, through controlling the high side steam flow of heat supply bypass and the desuperheating water temperature of heat supply bypass, can promote reliability and the economic nature of regulation, promote unit operating efficiency, real-time supervision parameter guarantees the safe operation of steam turbine.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
The embodiment of the invention provides a computer device, which comprises a memory and a processor, wherein the memory is used for storing information comprising program instructions, the processor is used for controlling execution of the program instructions, and when the program instructions are loaded and executed by the processor, the steps of the embodiment of the heat supply bypass control method of the thermal power generating unit are realized.
Referring now to FIG. 4, there is illustrated a schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application.
As shown in fig. 4, the computer apparatus 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data required for the operation of the computer device 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback device (LCD), and the like, and a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on drive 610 as needed, so that a computer program read therefrom is mounted as needed as storage section 608.
In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The data acquisition, storage, use, processing and the like in the technical scheme meet the relevant regulations of national laws and regulations.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (17)

1. A heating bypass control method of a thermal power generating unit, the method comprising:
acquiring system index data of a thermal power generating unit, wherein the system index data comprises turbine communication pipe temperature and bypass index data of a heat supply bypass;
according to the bypass index data, controlling the high bypass steam flow of the heat supply bypass;
and according to the temperature of the turbine communication pipe and bypass index data, performing input control on the temperature of the desuperheating water of the heat supply bypass.
2. A heat supply bypass control method of a thermal power generating unit according to claim 1, wherein the bypass index data includes high side index data;
the control of the high bypass steam flow of the heating bypass according to the bypass index data includes:
generating a high side flow calculation value according to the high side index data;
The high side flow calculated value and the obtained high side flow actual value are subjected to weighted calculation through preset flow weight, and a high side flow corrected value is generated;
and controlling the high bypass steam flow of the heat supply bypass according to the high bypass flow correction value.
3. The heat supply bypass control method of a thermal power generating unit according to claim 2, wherein the high bypass index data includes a high bypass pre-temperature, a high bypass pre-pressure, a high bypass desuperheating water flow rate, a high bypass desuperheating water temperature, a high bypass desuperheating water pressure, a high bypass post-temperature, and a high bypass post-pressure;
the generating a high-side flow calculation value according to the high-side index data includes:
generating a high pre-side enthalpy value according to the high pre-side temperature and the high pre-side pressure;
generating a high-side desuperheating water enthalpy value according to the high-side desuperheating water temperature and the high-side desuperheating water pressure;
generating a high post-side enthalpy value according to the high post-side temperature and the high post-side pressure;
and generating the high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
4. The heat supply bypass control method of a thermal power generating unit according to claim 1, wherein the bypass index data includes high side index data and low side index data, and the turbine communication pipe temperature includes a high pressure cylinder communication pipe temperature and a medium and low pressure cylinder communication pipe temperature;
According to the turbine communication pipe temperature and bypass index data, the input control of the temperature of the desuperheating water of the heat supply bypass is carried out, and the method comprises the following steps:
in the automatic throwing stage, according to the high-side index data and the high-pressure cylinder communication pipe temperature, the high-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the high-side temperature reduction water is completed;
and in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, the low-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the low-side temperature reduction water is completed.
5. A heat supply bypass control method of a thermal power generating unit according to claim 4, wherein the high-side index data includes a high-side desuperheating water temperature;
according to the high side index data and the high pressure cylinder communicating pipe temperature, the high side attemperation water is subjected to temperature regulation according to a preset regulation rate, the input control of the high side attemperation water is completed, and the method comprises the following steps:
if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is larger than a preset first temperature threshold, determining the high-pressure cylinder communication pipe temperature as a high-side temperature-reducing water target temperature;
According to the regulating speed, regulating the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water;
if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller than or equal to the first temperature threshold value, acquiring the steam temperature after the high-side valve;
and setting the high-side desuperheating water temperature to be the steam temperature after the high-side valve.
6. A heat supply bypass control method of a thermal power generating unit according to claim 4, wherein the low-side index data includes a low-side desuperheating water temperature;
according to the low side index data and the temperature of the communication pipe of the middle and low pressure cylinder, the low side attemperation water is subjected to temperature adjustment according to a preset adjustment rate, so that the investment control of the low side attemperation water is completed, and the method comprises the following steps:
if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle and low pressure cylinder communication pipe is larger than a preset second temperature threshold, determining the temperature of the middle and low pressure cylinder communication pipe as a low-side temperature-reducing water target temperature;
according to the adjustment rate, adjusting the low-side desuperheating water temperature to the low-side desuperheating water target temperature;
if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller than or equal to the second temperature threshold value, acquiring the steam temperature after the low-side valve;
Setting the low bypass attemperation water temperature to the low bypass valve post-steam temperature.
7. A heat supply bypass control method of a thermal power generating unit according to claim 1, characterized in that the method further comprises:
acquiring the controlled unit operation parameters according to a preset time interval;
performing hierarchical protection triggering judgment on the heat supply bypass according to the set operation parameters by using a set hierarchical protection strategy to obtain a triggering result;
if the triggering result is triggering hierarchical protection, determining a protection level, executing a protection action corresponding to the protection level, and continuing to execute the step of acquiring the controlled unit operation parameters according to a preset time interval, wherein the protection level comprises a locking level, an override level and a bypass protection level, the protection action corresponding to the locking level is a locking action, the protection action corresponding to the override level is an override action, and the protection action corresponding to the bypass protection level is a bypass closing action.
8. A heating bypass control device of a thermal power generating unit, the device comprising:
the first acquisition unit is used for acquiring system index data of the thermal power generating unit, wherein the system index data comprises the temperature of a turbine communication pipe and bypass index data of a heat supply bypass;
The flow control unit is used for controlling the high-side steam flow of the heat supply bypass according to the bypass index data;
and the input control unit is used for controlling the input of the temperature of the desuperheating water of the heat supply bypass according to the temperature of the turbine communication pipe and bypass index data.
9. A thermal power plant heating bypass control apparatus according to claim 8, wherein the bypass index data includes high bypass index data;
the flow control unit is specifically configured to generate a high-side flow calculation value according to the high-side index data; the high side flow calculated value and the obtained high side flow actual value are subjected to weighted calculation through preset flow weight, and a high side flow corrected value is generated; and controlling the high bypass steam flow of the heat supply bypass according to the high bypass flow correction value.
10. A thermal power plant heating bypass control apparatus according to claim 9, wherein the high bypass index data includes a high bypass pre-temperature, a high bypass pre-pressure, a high bypass desuperheating water flow, a high bypass desuperheating water temperature, a high bypass desuperheating water pressure, a high bypass post-temperature, and a high bypass post-pressure;
the flow control unit is specifically used for generating a high bypass front enthalpy value according to the high bypass front temperature and the high bypass front pressure; generating a high-side desuperheating water enthalpy value according to the high-side desuperheating water temperature and the high-side desuperheating water pressure; generating a high post-side enthalpy value according to the high post-side temperature and the high post-side pressure; and generating the high-side flow calculated value according to the high-side desuperheating water flow, the high-side pre-enthalpy value, the high-side desuperheating water enthalpy value and the high-side post-enthalpy value.
11. A heat supply bypass control device of a thermal power generating unit according to claim 8, wherein the bypass index data includes high side index data and low side index data, and the turbine communication pipe temperature includes a high pressure cylinder communication pipe temperature and a medium and low pressure cylinder communication pipe temperature;
the input control unit is specifically used for carrying out temperature adjustment on the high-side desuperheating water according to the high-side index data and the high-pressure cylinder communication pipe temperature and a preset adjustment rate in an automatic input stage so as to complete input control on the high-side desuperheating water; and in the automatic throwing stage, according to the low-side index data and the temperature of the middle-low pressure cylinder communication pipe, the low-side temperature reduction water is subjected to temperature adjustment according to a preset adjustment rate, and the throwing control of the low-side temperature reduction water is completed.
12. A thermal power plant heating bypass control apparatus according to claim 11, wherein the high bypass index data includes a high bypass attemperation water temperature;
the input control unit is specifically configured to determine the high-pressure cylinder communication pipe temperature as a high-side temperature reduction water target temperature if a temperature deviation between the high-side temperature reduction water temperature and the high-pressure cylinder communication pipe temperature is greater than a preset first temperature threshold; according to the regulating speed, regulating the temperature of the high-side desuperheating water to the target temperature of the high-side desuperheating water; if the temperature deviation between the high-side temperature-reducing water temperature and the high-pressure cylinder communication pipe temperature is smaller than or equal to the first temperature threshold value, acquiring the steam temperature after the high-side valve; and setting the high-side desuperheating water temperature to be the steam temperature after the high-side valve.
13. A thermal power plant heating bypass control apparatus according to claim 11, wherein the low bypass index data includes a low bypass attemperation water temperature;
the input control unit is specifically configured to determine the temperature of the middle and low pressure cylinder communication pipe as a low-side temperature reduction water target temperature if a temperature deviation between the low-side temperature reduction water temperature and the temperature of the middle and low pressure cylinder communication pipe is greater than a preset second temperature threshold; according to the adjustment rate, adjusting the low-side desuperheating water temperature to the low-side desuperheating water target temperature; if the temperature deviation between the low-side temperature-reducing water temperature and the temperature of the middle-low pressure cylinder communication pipe is smaller than or equal to the second temperature threshold value, acquiring the steam temperature after the low-side valve; setting the low bypass attemperation water temperature to the low bypass valve post-steam temperature.
14. A thermal power plant heating bypass control apparatus according to claim 8, characterized in that the apparatus further comprises:
the second acquisition unit is used for acquiring the controlled unit operation parameters according to the preset time interval;
the grading protection judging unit is used for carrying out grading protection triggering judgment on the heat supply bypass according to the set operation parameters through a grading protection strategy so as to obtain a triggering result;
And the protection action executing unit is used for determining a protection level if the triggering result is triggering grading protection, executing the protection action corresponding to the protection level, triggering the second acquiring unit to continue to execute the step of acquiring the controlled unit operation parameters according to the preset time interval, wherein the protection level comprises a locking level, an override level and a bypass protection level, the protection action corresponding to the locking level is a locking action, the protection action corresponding to the override level is an override action, and the protection action corresponding to the bypass protection level is a bypass closing action.
15. A computer-readable medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the heating bypass control method of a thermal power generating unit according to any one of claims 1 to 7.
16. A computer device comprising a memory for storing information including program instructions and a processor for controlling execution of the program instructions, characterized in that the program instructions, when loaded and executed by the processor, implement the heating bypass control method of a thermal power generating unit according to any one of claims 1 to 7.
17. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the heating bypass control method of a thermal power plant according to any one of claims 1 to 7.
CN202311464722.8A 2023-11-06 2023-11-06 Heat supply bypass control method and device for thermal power generating unit Pending CN117537332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311464722.8A CN117537332A (en) 2023-11-06 2023-11-06 Heat supply bypass control method and device for thermal power generating unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311464722.8A CN117537332A (en) 2023-11-06 2023-11-06 Heat supply bypass control method and device for thermal power generating unit

Publications (1)

Publication Number Publication Date
CN117537332A true CN117537332A (en) 2024-02-09

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN117537332A (en)

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