CN116816457A - Control system and method for preventing steam pressure abnormality by zero-output heat supply of low-pressure cylinder - Google Patents

Control system and method for preventing steam pressure abnormality by zero-output heat supply of low-pressure cylinder Download PDF

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Publication number
CN116816457A
CN116816457A CN202310722751.3A CN202310722751A CN116816457A CN 116816457 A CN116816457 A CN 116816457A CN 202310722751 A CN202310722751 A CN 202310722751A CN 116816457 A CN116816457 A CN 116816457A
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CN
China
Prior art keywords
steam
pressure cylinder
pressure
steam turbine
low
Prior art date
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Pending
Application number
CN202310722751.3A
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Chinese (zh)
Inventor
王铂
耿林霄
付宁
宋杰
王珩
卢彬
李雪莉
冯震震
杨勇
周扬
薛松
李亚都
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
Huaneng Shandong Power Generation Co Ltd
Huaneng Weihai Power Generation Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Huaneng Shandong Power Generation Co Ltd
Huaneng Weihai Power Generation 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.)
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Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd, Huaneng Shandong Power Generation Co Ltd, Huaneng Weihai Power Generation Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Priority to CN202310722751.3A priority Critical patent/CN116816457A/en
Publication of CN116816457A publication Critical patent/CN116816457A/en
Pending legal-status Critical Current

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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
    • F01D13/00—Combinations of two or more machines or engines
    • F01D13/02—Working-fluid interconnection of machines or engines
    • 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
    • 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
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/345—Control or safety-means particular thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type

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

Abstract

The application provides a control system for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, which comprises a middle-pressure cylinder of a steam turbine, the low-pressure cylinder of the steam turbine, a pressure testing device and a hydraulic control butterfly valve, wherein the middle-pressure cylinder of the steam turbine is connected with the low-pressure cylinder of the steam turbine through at least one steam pipeline and is used for discharging steam to the low-pressure cylinder of the steam turbine; the pressure testing device is used for obtaining the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine; the hydraulic control butterfly valve is arranged on a steam pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and used for regulating and controlling the opening of the hydraulic control butterfly valve until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation, so that the automatic control level of the steam pressure during zero-output heat supply of the low pressure cylinder is effectively improved by regulating and controlling the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine, and the safe operation of zero-output heat supply of the low pressure cylinder is ensured.

Description

Control system and method for preventing steam pressure abnormality by zero-output heat supply of low-pressure cylinder
Technical Field
The application relates to the technical field of heating units, in particular to a control system and a control method for preventing abnormal steam pressure by zero-output heat supply of a low-pressure cylinder.
Background
At present, the low-pressure cylinder zero-output technology is mature and successfully applied to a plurality of units, but due to reasons of load change, improper operation of operators, unreasonable design of a control system and the like, the unit after the low-pressure cylinder zero-output modification has the conditions of rising of the exhaust pressure of a medium-pressure cylinder or lowering of the inlet pressure of the low-pressure cylinder in the operation process, and seriously even the unit can be withdrawn from the low-pressure cylinder zero-output operation, so that a series of negative effects are brought, in the related technology, the exhaust pressure of the medium-pressure cylinder and the inlet pressure of the low-pressure cylinder are regulated and controlled generally by combining experience with people, but the regulation is not timely and can not be accurately regulated and controlled, and therefore, a more reliable control system for preventing the steam pressure abnormality by the zero-output heat supply of the low-pressure cylinder is needed.
Disclosure of Invention
According to one aspect, the embodiment of the application provides a control system for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, wherein the system comprises a middle-pressure cylinder of a steam turbine, the low-pressure cylinder of the steam turbine, a pressure testing device and a hydraulic control butterfly valve, and the control system comprises the following components:
the middle pressure cylinder of the steam turbine is connected with the low pressure cylinder of the steam turbine through at least one steam pipeline and is used for discharging steam to the low pressure cylinder of the steam turbine;
the pressure testing device is respectively arranged at the outlet of the middle pressure cylinder of the steam turbine and the inlet of the low pressure cylinder of the steam turbine and is used for obtaining the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine;
the hydraulic control butterfly valve is arranged on a steam pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and is used for adjusting and controlling the opening of the hydraulic control butterfly valve until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation.
In one embodiment of the application, the system further comprises a low pressure cylinder cooling steam electrically operated regulator valve, wherein:
the low-pressure cylinder cooling steam electric regulating valve is arranged on a steam exhaust pipeline between the middle-pressure cylinder and the low-pressure cylinder of the steam turbine and is used for exhausting steam to the low-pressure cylinder and regulating and controlling the pressure of the steam in the steam exhaust pipeline.
In one embodiment of the application, the system further comprises a heating steam extraction pipeline pneumatic check valve, wherein:
the pneumatic check valve of the heat supply steam extraction pipeline is arranged on the heat supply steam extraction pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and is used for preventing steam in the heat supply steam extraction pipeline from flowing back.
In one embodiment of the application, the system further comprises a thermal network steam extraction pipeline hydraulically controlled butterfly valve, wherein:
the hydraulic control butterfly valve of the heating network steam extraction pipeline is also arranged on the heating steam extraction pipeline and used for regulating and controlling the pressure of steam in the heating steam extraction pipeline.
In one embodiment of the application, under the condition of heat supply of a low-pressure cylinder of the steam turbine, the opening of a hydraulic control butterfly valve and the opening of an electric control valve of cooling steam of the low-pressure cylinder are continuously adjusted, a pneumatic check valve of a heat supply and steam extraction pipeline on a heat supply and steam extraction pipeline is opened, and the opening of the hydraulic control butterfly valve of the heat supply network steam extraction pipeline on a heat supply network steam extraction pipeline is adjusted until the pressure difference is smaller than a preset deviation.
In one embodiment of the application, when the middle pressure cylinder of the steam turbine is connected with the low pressure cylinder of the steam turbine through two steam pipelines, the hydraulic butterfly valves are arranged on the two steam pipelines.
In one embodiment of the application, the upper limit of the opening of the hydraulic control butterfly valve is determined by equipment parameters of the steam turbine.
In one embodiment of the application, in the case that the pressure testing device is a plurality of pressure sensors, the average measured value of the plurality of pressure sensors arranged at the outlet of the middle pressure cylinder of the steam turbine is taken as the steam pressure at the outlet of the middle pressure cylinder of the steam turbine, and the average measured value of the plurality of pressure sensors arranged at the outlet of the low pressure cylinder of the steam turbine is taken as the steam pressure at the inlet of the low pressure cylinder of the steam turbine.
The application provides a control system for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, which comprises a middle-pressure cylinder of a steam turbine, the low-pressure cylinder of the steam turbine, a pressure testing device and a hydraulic control butterfly valve, wherein the middle-pressure cylinder of the steam turbine is connected with the low-pressure cylinder of the steam turbine through at least one steam pipeline and is used for discharging steam to the low-pressure cylinder of the steam turbine; the pressure testing device is used for obtaining the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine; the hydraulic control butterfly valve is arranged on a steam pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and used for regulating and controlling the opening of the hydraulic control butterfly valve until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation, so that the automatic control level of the steam pressure during zero-output heat supply of the low pressure cylinder is effectively improved by regulating and controlling the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine, and the safe operation of zero-output heat supply of the low pressure cylinder is ensured.
In another embodiment of the present application, a control method for preventing abnormal steam pressure by zero-output heat supply of a low pressure cylinder is provided, where the method includes:
acquiring the steam pressure at the outlet of a middle pressure cylinder of a steam turbine and the steam pressure at the inlet of a low pressure cylinder of the steam turbine;
and regulating and controlling the discharged steam based on the pressure difference between the steam pressure of the middle pressure cylinder outlet of the steam turbine and the steam pressure of the inlet of the low pressure cylinder of the steam turbine until the pressure difference is smaller than a preset deviation.
The application provides a control method for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, which is used for acquiring steam pressure at an outlet of a middle-pressure cylinder of a steam turbine and steam pressure at an inlet of the low-pressure cylinder of the steam turbine; and regulating and controlling the exhaust steam based on the pressure difference between the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine until the pressure difference is smaller than a preset deviation, so that the automatic control level of the steam pressure during zero-output heat supply of the low pressure cylinder is effectively improved by regulating and controlling the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine, and the safe operation of zero-output heat supply of the low pressure cylinder is ensured.
Other effects of the above alternative will be described below in connection with specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a control system for zero-output heating of a low pressure cylinder to prevent vapor pressure anomalies in accordance with one embodiment of the present application;
FIG. 2 is a schematic diagram of a control method of a hydraulically controlled butterfly valve in accordance with an embodiment of the application;
FIG. 3 is a flow chart of a control method for preventing abnormal steam pressure by zero-force heat supply of a low pressure cylinder according to an embodiment of the application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The control system for preventing abnormal steam pressure by zero-output heat supply of the low-pressure cylinder according to the embodiment of the application is described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a control system for zero-output heating of a low pressure cylinder to prevent steam pressure anomalies in accordance with one embodiment of the present application.
As shown in fig. 1, the control system 100 for preventing abnormal steam pressure by zero-output heat supply of a low pressure cylinder comprises a middle pressure cylinder 101 of a steam turbine, a low pressure cylinder 102 of the steam turbine, a pressure testing device 103 and a hydraulic control butterfly valve 104, wherein:
alternatively, as shown in FIG. 1, a steam turbine intermediate pressure cylinder 101 is connected to a steam turbine low pressure cylinder 102 by at least one steam line for exhausting steam to the steam turbine low pressure cylinder 102.
In some embodiments, as shown in FIG. 1, in the case where the in-turbine pressure cylinder 101 is connected to the low-pressure cylinder 102 of the turbine by two steam lines, both steam lines are fitted with hydraulic butterfly valves 104.
The number of steam pipes between the middle pressure cylinder 101 and the low pressure cylinder 102 is determined by the application requirement of the steam turbine, and the embodiment is not particularly limited.
Alternatively, as shown in fig. 1, a pressure testing device 103 is respectively installed at the outlet of the middle pressure cylinder 101 of the steam turbine and at the inlet of the low pressure cylinder 102 of the steam turbine, so as to obtain the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine.
In some embodiments, in the case where the pressure testing device 103 is a plurality of pressure sensors, a measured average value of the plurality of pressure sensors installed at the outlet of the in-turbine cylinder 101 is taken as the in-turbine cylinder outlet steam pressure, and a measured average value of the plurality of pressure sensors installed at the outlet of the in-turbine low pressure cylinder 102 is taken as the in-turbine low pressure cylinder inlet steam pressure.
The number of the pressure sensors may be 3, but is not limited thereto.
Optionally, as shown in fig. 1, a hydraulic butterfly valve 104 is installed on a steam pipeline between a middle pressure cylinder 101 and a low pressure cylinder 102 of the steam turbine, and is used for adjusting and controlling the opening degree of the hydraulic butterfly valve 104 until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation.
In some embodiments, the upper limit of the opening of the pilot operated butterfly valve 104 is determined by plant parameters of the steam turbine.
It will be appreciated that, to ensure stable operation of the turbine unit, the opening of the hydraulic butterfly valve 104 cannot stay in the opening range from 0 to a certain value (upper limit of opening) for a long time, the middle pressure cylinder 101 of the turbine may be connected with the low pressure cylinder 102 of the turbine through two steam pipes, and the two steam pipes are respectively provided with the hydraulic butterfly valve 104, and the pressure testing device 103 is exemplified by three sensors.
Specifically, as shown in fig. 2, fig. 2 is three embodiments for adjusting the opening degrees of the hydraulic butterfly valves 104, and as shown in fig. 2, in the first embodiment, when the opening degrees of the two hydraulic butterfly valves 104 are both smaller than 25%, the average value of 3 sensors (a first pressure sensor, a second pressure sensor, and a third pressure sensor) at the outlet of the pressure cylinder 101 in the steam turbine is selected every 3 seconds, and the exhaust pressure value of the pressure cylinder in the full-open working condition of the valve of the hydraulic butterfly valve 104 is selected, and under the condition that the average value of 3 sensors (the steam pressure value of the outlet of the pressure cylinder in the steam turbine) is greater than 1.05 times the exhaust pressure (0.548 MPa) of the pressure cylinder in the full-open working condition of the valve, the opening degrees of the two hydraulic butterfly valves 104 are quickly adjusted to 25%.
In the second embodiment, when the opening of the two hydraulic butterfly valves 104 is smaller than 25%, 3 average values of sensors at the outlet of the middle pressure cylinder 101 of the steam turbine are selected every 3 seconds, and the exhaust pressure value of the middle pressure cylinder when the valve of the hydraulic butterfly valve 104 is in the full-open working condition, and when the average value of the 3 sensors (the steam pressure value of the outlet of the middle pressure cylinder of the steam turbine) is larger than 1.05 times of the exhaust pressure (0.548 MPa) of the middle pressure cylinder when the valve is in the full-open working condition, the opening of the two hydraulic butterfly valves 104 is continuously regulated (every 30 seconds, 1% is added) until the steam pressure value of the outlet of the middle pressure cylinder of the steam turbine is lower than 1.0 times of the exhaust pressure (0.548 MPa).
In the third embodiment, when the opening of the two hydraulic butterfly valves 104 is greater than 25%, the average value of 3 sensors (fourth pressure sensor, fifth pressure sensor, sixth pressure sensor) at the outlet of the low pressure cylinder 102 of the turbine is selected every 3 seconds, and a preset pressure value is selected, and when the average value of 3 sensors (the steam pressure value at the inlet of the low pressure cylinder of the turbine) is lower than the preset pressure value (0.1000 MPa), the opening of the two hydraulic butterfly valves 104 is continuously regulated (every 30 seconds, 1% is added) until the steam pressure value at the inlet of the low pressure cylinder of the turbine is higher than the preset pressure value (0.1000 MPa).
Where H// in FIG. 2 represents greater than,// L represents less than, AND represents a gate.
Optionally, as shown in fig. 1, the system further comprises a low pressure cylinder cooling steam electrically operated regulator valve 105, wherein:
the low-pressure cylinder cooling steam electric regulating valve 105 is arranged on a steam exhaust pipeline between the middle-pressure cylinder 101 and the low-pressure cylinder 102 of the steam turbine and is used for exhausting steam to the low-pressure cylinder and regulating and controlling the pressure of the steam in the steam exhaust pipeline.
Optionally, as shown in fig. 1, the system further comprises a heating steam extraction pipeline pneumatic check valve 106, wherein:
a heat supply steam extraction pipeline pneumatic check valve 106 is installed on the heat supply steam extraction pipeline between the steam turbine medium pressure cylinder 101 and the steam turbine low pressure cylinder 102, and is used for preventing steam in the heat supply steam extraction pipeline from flowing back.
Optionally, as shown in fig. 1, the system further comprises a heat supply network steam extraction pipeline hydraulic butterfly valve 107, wherein:
a hydraulic butterfly valve 107 of the heat supply network steam extraction pipeline is also installed on the heat supply steam extraction pipeline for regulating and controlling the pressure of steam in the heat supply steam extraction pipeline.
In summary, the control flow of the low pressure cylinder zero-output heat supply to prevent the abnormal steam pressure can be as follows, the steam exhausted by the middle pressure cylinder 101 of the steam turbine is exhausted to the low pressure cylinder 102 of the steam turbine through the steam pipeline provided with the hydraulic control butterfly valve 104, when the zero-output heat supply of the low pressure cylinder 102 of the steam turbine is not input, the opening degree of the hydraulic control butterfly valve 104 is limited to 100%, the low pressure cylinder cools the steam electric regulating valve 105, and the pneumatic check valve 106 of the heat supply steam extraction pipeline and the hydraulic control butterfly valve 107 of the heat supply network steam extraction pipeline are all in a closed state.
Under the condition that the low pressure cylinder 102 of the steam turbine supplies heat, the opening of the hydraulic control butterfly valve 104 and the opening of the low pressure cylinder cooling steam electric regulating valve 105 are continuously regulated, the pneumatic check valve 106 of the heat supply steam extraction pipeline on the heat supply steam extraction pipeline is opened, and the opening of the hydraulic control butterfly valve 107 of the heat supply network steam extraction pipeline on the heat supply network steam extraction pipeline is regulated until the pressure difference is smaller than a preset deviation.
Specifically, after the low-pressure cylinder is put into heat supply, the 100% opening restriction of the hydraulic butterfly valve 104 is released, after the heating pipe operation is performed, the opening of the hydraulic butterfly valve 104 is continuously adjusted, the heat supply steam extraction pipeline pneumatic check valve 106 is opened, the opening of the heat supply network steam extraction pipeline hydraulic butterfly valve 107 is adjusted to start heat supply, and meanwhile, in order to ensure the minimum flow of steam entering the low-pressure cylinder 102 of the steam turbine, the opening of the low-pressure cylinder cooling steam electric regulating valve 105 can be opened to 20%.
The application provides a control system for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, which comprises a middle-pressure cylinder of a steam turbine, the low-pressure cylinder of the steam turbine, a pressure testing device and a hydraulic control butterfly valve, wherein the middle-pressure cylinder of the steam turbine is connected with the low-pressure cylinder of the steam turbine through at least one steam pipeline and is used for discharging steam to the low-pressure cylinder of the steam turbine; the pressure testing device is used for obtaining the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine; the hydraulic control butterfly valve is arranged on a steam pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and used for regulating and controlling the opening of the hydraulic control butterfly valve until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation, so that the automatic control level of the steam pressure during zero-output heat supply of the low pressure cylinder is effectively improved by regulating and controlling the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine, and the safe operation of zero-output heat supply of the low pressure cylinder is ensured.
In order to understand the application more clearly, the application also provides a flow diagram of a control method for preventing the steam pressure abnormality by zero-output heat supply of the low-pressure cylinder, as shown in fig. 3.
As shown in fig. 3, the control method for preventing the steam pressure abnormality by zero-output heat supply of the low-pressure cylinder comprises the following steps:
step 301, obtaining the steam pressure at the outlet of a middle pressure cylinder of the steam turbine and the steam pressure at the inlet of a low pressure cylinder of the steam turbine.
The steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine can be measured by a single sensor, or can be the average value measured by a plurality of sensors, and the embodiment is not particularly limited to this.
And step 302, regulating and controlling the exhaust steam based on the pressure difference between the steam pressure of the outlet of the middle pressure cylinder of the steam turbine and the steam pressure of the inlet of the low pressure cylinder of the steam turbine until the pressure difference is smaller than a preset deviation.
The preset deviation may be set by a related technician, or may be set by combining historical data of the steam pressure during zero-output heat supply of the low-pressure cylinder, which is not particularly limited in this embodiment.
The application provides a control method for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, which is used for acquiring steam pressure at an outlet of a middle-pressure cylinder of a steam turbine and steam pressure at an inlet of the low-pressure cylinder of the steam turbine; and regulating and controlling the exhaust steam based on the pressure difference between the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine until the pressure difference is smaller than a preset deviation, so that the automatic control level of the steam pressure during zero-output heat supply of the low pressure cylinder is effectively improved by regulating and controlling the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine, and the safe operation of zero-output heat supply of the low pressure cylinder is ensured.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (9)

1. The utility model provides a control system that low pressure jar zero output heat supply prevents steam pressure is unusual which characterized in that, the system includes in the steam turbine pressure jar, steam turbine low pressure jar, pressure testing arrangement, hydraulically controlled butterfly valve, wherein:
the middle pressure cylinder of the steam turbine is connected with the low pressure cylinder of the steam turbine through at least one steam pipeline and is used for discharging steam to the low pressure cylinder of the steam turbine;
the pressure testing device is respectively arranged at the outlet of the middle pressure cylinder of the steam turbine and the inlet of the low pressure cylinder of the steam turbine and is used for obtaining the steam pressure at the outlet of the middle pressure cylinder of the steam turbine and the steam pressure at the inlet of the low pressure cylinder of the steam turbine;
the hydraulic control butterfly valve is arranged on a steam pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and is used for adjusting and controlling the opening of the hydraulic control butterfly valve until the pressure difference between the outlet steam pressure of the middle pressure cylinder of the steam turbine and the inlet steam pressure of the low pressure cylinder of the steam turbine is smaller than a preset deviation.
2. The low pressure cylinder zero-force heat supply vapor pressure anomaly prevention control system of claim 1, further comprising a low pressure cylinder cooling vapor electrically operated regulator valve, wherein:
the low-pressure cylinder cooling steam electric regulating valve is arranged on a steam exhaust pipeline between the middle-pressure cylinder and the low-pressure cylinder of the steam turbine and is used for exhausting steam to the low-pressure cylinder and regulating and controlling the pressure of the steam in the steam exhaust pipeline.
3. The low pressure cylinder zero-force heat supply vapor pressure anomaly prevention control system of claim 1, further comprising a heat supply extraction conduit pneumatic check valve, wherein:
the pneumatic check valve of the heat supply steam extraction pipeline is arranged on the heat supply steam extraction pipeline between the middle pressure cylinder and the low pressure cylinder of the steam turbine and is used for preventing steam in the heat supply steam extraction pipeline from flowing back.
4. The control system for zero-force heating of a low pressure cylinder to prevent vapor pressure anomalies of claim 3, further comprising a heat supply network extraction line pilot operated butterfly valve, wherein:
the hydraulic control butterfly valve of the heating network steam extraction pipeline is also arranged on the heating steam extraction pipeline and used for regulating and controlling the pressure of steam in the heating steam extraction pipeline.
5. The control system for preventing steam pressure abnormality by zero-force heat supply of a low pressure cylinder according to claims 1-4, wherein in the case of heat supply of a low pressure cylinder of a steam turbine, the opening degree of a hydraulic control butterfly valve and the opening degree of an electric control valve for cooling steam of the low pressure cylinder are continuously adjusted, a pneumatic check valve of a heat supply steam extraction pipeline on a heat supply steam extraction pipeline is opened, and the opening degree of a hydraulic control butterfly valve of a heat supply network steam extraction pipeline on a heat supply network steam extraction pipeline is adjusted until the pressure difference is smaller than a preset deviation.
6. The control system for zero-force heat supply of a low pressure cylinder to prevent steam pressure abnormality according to claim 1, wherein the hydraulic butterfly valve is installed on both steam pipes in the case that the pressure cylinder in the steam turbine is connected to the low pressure cylinder of the steam turbine through both steam pipes.
7. The control system for zero-force heat supply of a low pressure cylinder to prevent steam pressure abnormality according to claim 6, wherein an upper limit of opening of the hydraulic butterfly valve is determined by a plant parameter of a steam turbine.
8. The control system for zero-force heat supply of a low pressure cylinder to prevent steam pressure abnormality according to claim 1, wherein in the case where the pressure test device is a plurality of pressure sensors, a measurement average value of a plurality of pressure sensors installed at an outlet of the low pressure cylinder in the steam turbine is taken as an outlet steam pressure of the low pressure cylinder in the steam turbine, and a measurement average value of a plurality of pressure sensors installed at an outlet of the low pressure cylinder in the steam turbine is taken as an inlet steam pressure of the low pressure cylinder in the steam turbine.
9. A control method for preventing steam pressure abnormality by zero-output heat supply of a low-pressure cylinder, characterized by comprising:
acquiring the steam pressure at the outlet of a middle pressure cylinder of a steam turbine and the steam pressure at the inlet of a low pressure cylinder of the steam turbine;
and regulating and controlling the discharged steam based on the pressure difference between the steam pressure of the middle pressure cylinder outlet of the steam turbine and the steam pressure of the inlet of the low pressure cylinder of the steam turbine until the pressure difference is smaller than a preset deviation.
CN202310722751.3A 2023-06-16 2023-06-16 Control system and method for preventing steam pressure abnormality by zero-output heat supply of low-pressure cylinder Pending CN116816457A (en)

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CN116816457A true CN116816457A (en) 2023-09-29

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