CN113944616B - Control method of water supply pump of thermal power plant - Google Patents
Control method of water supply pump of thermal power plant Download PDFInfo
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- CN113944616B CN113944616B CN202111152544.6A CN202111152544A CN113944616B CN 113944616 B CN113944616 B CN 113944616B CN 202111152544 A CN202111152544 A CN 202111152544A CN 113944616 B CN113944616 B CN 113944616B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a control method of a water supply pump of a thermal power plant, which is applied to a thermal power unit, wherein the thermal power unit comprises the following components: the boiler comprises a boiler, a first water supply channel, a second water supply channel and a water supply main pipe; the method comprises the following steps: acquiring the water pressure of the first water supply channel and the water supply main pipe, judging the difference value between the water supply main pipe and the first water supply channel, and opening or closing the electric door if the difference value is within a first preset range; and acquiring the rotating speed of the first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range. By applying the technical scheme, the control method of the water supply pump of the thermal power plant is utilized, based on the automatic control characteristic of the thermal power plant, the water supply pump is completed by one key from the aspects of intelligence, automation and safety, the operation amount of personnel is reduced, the safety risk is reduced, the automation rate is improved, and a foundation is laid for realizing one-key start and stop in the future.
Description
Technical Field
The application relates to the technical field of control of thermal power plants, in particular to a control method of a technical pump of a thermal power plant.
Background
In the existing process of starting, stopping or overhauling and backing up the water supply pump, the water supply pump is operated very critically, and for a long time, the method is limited by an automatic control technology, a manual operation mode is always adopted, an operator comprehensively considers key points such as the outlet pressure of the water supply pump, the water supply flow, the superheat degree and the like according to an operation ticket step, the rotating speed of the standby water supply pump is gradually regulated, and finally the water supply pump is thrown and backed up. During operation, there is a greater safety risk for the operation due to the difference in technical strength of personnel.
Disclosure of Invention
The invention provides a control method of a water supply pump of a thermal power plant, which is used for solving the technical problems that the water supply pump in the prior art is retracted and is manually operated, and the safety risk is high.
Aiming at the technical problems, in some embodiments of the present application, a control method of a water supply pump of a thermal power plant is provided, and the control method is applied to a thermal power unit, where the thermal power unit includes: a boiler; the first water supply path comprises a first water supply pump and a second water supply path of the electric door, the second water supply path comprises a second water supply pump, and the first water supply path is connected with the second water supply path in parallel. And the first water supply path is connected with the water supply main pipe through the electric door.
The control method comprises the following steps:
acquiring the water pressure of the first water supply channel and the water supply main pipe, judging the difference value between the water supply main pipe and the first water supply channel, and opening or closing the electric door if the difference value is within a first preset range;
and acquiring the rotating speed of the first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range.
In some embodiments of the present application, the water pressure of the first water supply channel and the water supply main pipe is obtained, and the difference value between the water supply main pipe and the first water supply channel is determined, if the difference value is within a first preset range, the electric door is opened or closed, which specifically includes:
if the difference value is within the first preset range, opening the electric door;
if the difference value is in the third preset range, increasing the rotating speed of the first water supply pump by a first preset rotating speed value;
if the difference value is in the fourth preset range, reducing the rotating speed of the first water supply pump by a second preset rotating speed value;
the third preset range is larger than the first preset range, and the first preset range is larger than the fourth preset range.
In some embodiments of the present application, increasing the rotational speed of the first feedwater pump by an amount to a first preset rotational speed value, after which the method further includes:
and operating for a first time period according to the first preset rotating speed value, and then judging the difference value between the water supply main pipe and the first water supply channel again.
In some embodiments of the present application, the rotational speed of the first feed pump is reduced by a second preset rotational speed value, after which the method further comprises:
and operating the first time length with the second preset rotating speed value, and then judging the difference value between the water supply main pipe and the first water supply channel again.
In some embodiments of the present application, the method includes obtaining a rotation speed of the first water feeding pump, determining whether the rotation speed is within a second preset range, if not, increasing or decreasing the rotation speed until the rotation speed is within the second preset range, specifically:
after the electric door is opened, the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump are obtained, and whether the rotating speed is in the second preset range or not is judged, wherein the second preset range is that the difference value between the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump is larger than or equal to zero;
if yes, ending the control;
if not, the rotating speed of the first water supply pump is increased by a third preset rotating speed value, the second time is continuously operated, and whether the rotating speed is in the second preset range is judged again.
In some embodiments of the present application, the water pressure of the first water supply channel and the water supply main pipe is obtained, and the difference value between the water supply main pipe and the first water supply channel is determined, if the difference value is within a first preset range, the electric door is opened or closed, which specifically includes:
if the difference value is within the first preset range, closing the electric door;
if the difference value is in the third preset range, reducing the rotating speed of the first water supply pump by a first preset rotating speed value;
wherein the first preset range is greater than the third preset range.
In some embodiments of the present application, the rotational speed of the first feed pump is reduced by a first preset rotational speed value, after which the method further comprises:
and operating for a first time period according to the first preset rotating speed value, and then judging the pressure difference value between the water supply main pipe and the first water supply channel again.
In some embodiments of the present application, the method includes obtaining a rotation speed of the first water feeding pump, determining whether the rotation speed is within a second preset range, if not, increasing or decreasing the rotation speed until the rotation speed is within the second preset range, specifically:
after the electric door is closed, acquiring the rotating speed of the first water supply pump, and judging whether the rotating speed is in a second preset range or not, wherein the second preset range is 3600rpm;
if the rotating speed of the first water supply pump is larger than 3600rpm, the rotating speed is reduced to 3600rpm;
if the rotating speed of the first water supply pump is less than 3600rpm, the rotating speed is increased to 3600rpm.
In some embodiments of the present application, before the obtaining of the water pressure of the first water supply channel and the water supply main, the method further comprises:
detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW before and keeping stable;
detecting and confirming that the water supply flow of the boiler is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃;
and detecting and confirming that the first water supply pump is ended.
In some embodiments of the present application, before the obtaining of the water pressure of the first water supply channel and the water supply main, the method further comprises:
detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW before and keeping stable;
detecting and confirming that the water supply flow of the boiler is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃;
detecting and confirming that the first water supply pump warms up;
detecting and confirming that the first feed pump and the electric door are fully opened.
By applying the technical scheme, the control method of the water supply pump of the thermal power plant is utilized, based on the automatic control characteristic of the thermal power plant, the water supply pump is completed by one key from the aspects of intelligence, automation and safety, the operation amount of personnel is reduced, the safety risk is reduced, the automation rate is improved, and a foundation is laid for realizing one-key start and stop in the future.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of a control method of a long thermal power feed pump according to an embodiment of the invention;
fig. 2 shows a flow chart of a heat-engine long feed pump and a pump in the control method of the heat-engine long feed pump according to the embodiment of the invention;
fig. 3 shows a flow chart of the feed pump withdrawal in the control method of the thermal power long feed pump according to the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a control method of a water supply pump of a thermal power plant, which is applied to a thermal power unit.
The first water supply path comprises a first water supply pump and an electric door; the second water supply path comprises a second water supply pump, and the first water supply path is connected with the second water supply path in parallel; the first water supply path is connected with the water supply main pipe through the electric door.
The first water supply channel is connected and disconnected through the opening and closing of the electric door; the water pressure in the first water supply channel can be changed by changing the rotating speed of the first water supply pump; the water pressure in the second water supply path can be changed by changing the rotational speed of the second water supply pump.
In an embodiment of the present application, as shown in fig. 1, the method includes:
step S101, obtaining the water pressures of the first water supply channel and the water supply main pipe, judging the difference between the water supply main pipe and the first water supply channel, and if the difference is within a first preset range, opening or closing the electric door.
In this embodiment, since the first water supply channel is connected to or disconnected from the water supply main, a pressure difference between the first water supply channel and the water supply main is required to be within a certain range, so as to prevent water flow fluctuation caused by too large or too small water pressure when the electric door is opened or closed, so as to ensure that water flow in the first water supply channel and the water supply main is relatively stable, and a pressure difference between the water supply main and the first water supply pump is required to be defined in advance.
Step S102, obtaining the rotating speed of the first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range.
In this embodiment, after the connection state of the first water supply pump is changed, the rotation speed of the first water supply pump needs to be continuously monitored to ensure that the thermal power unit is restored to the normal running state, the rotation speed range of the normal running state is set to be a second preset range, if the rotation speed does not meet the requirement, the rotation speed needs to be controlled to be restored to the preset requirement, and then the control program is ended. A step of
In order to further explain the technical idea of the invention, the technical scheme of the invention is described with specific application scenarios.
1. Parallel pumping method of water supply pump of thermal power plant
Acquiring the water pressure of a first water supply channel and a water supply main pipe, judging the difference value between the water supply main pipe and the first water supply channel, and opening the electric door if the difference value is within the first preset range; if the difference value is in the third preset range, increasing the rotating speed of the first water supply pump by a first preset rotating speed value, operating for a first duration with the first preset rotating speed value, and then re-judging the difference value between the water supply main pipe and the first water supply channel; if the difference value is in the fourth preset range, reducing the rotating speed of the first water supply pump, wherein the reducing amount is a second preset rotating speed value, operating for a first duration with the second preset rotating speed value, and then judging the difference value between the water supply main pipe and the first water supply channel again; the third preset range is larger than the first preset range, and the first preset range is larger than the fourth preset range.
In this embodiment, the first preset range is a range of intermediate values, so that excessive and excessive small pressure differences are avoided, and when the pressure differences are not in compliance with the requirements, the rotation speed is continuously increased or decreased for a period of time, so that the pressure differences are in compliance with the requirements.
It should be noted that, in practical application, one preferred embodiment of the above values is:
the first preset range is 1.5 MPa-2 MPa;
the third preset range is that the water pressure difference is more than 2MPa;
the fourth preset range is that the water pressure difference is less than 1.5MPa;
the first preset rotating speed value is 20rpm;
the second preset rotating speed value is 20rpm;
the first duration is 5s.
After the electric door is opened, the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump are obtained, and whether the rotating speed is in the second preset range or not is judged, wherein the second preset range is that the difference value between the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump is larger than or equal to zero; if yes, ending the control; if not, the rotating speed of the first water supply pump is increased by a third preset rotating speed value, the second time is continuously operated, and whether the rotating speed is in the second preset range is judged again.
In this embodiment, after the first electric door is opened, the first water feed pump and the second water feed pump are completed and pumped, but the rotation speed of the first water feed pump is required to be greater than that of the second water feed pump to ensure the stable operation of the water path, so that the step of detecting the difference between the rotation speeds of the first water feed pump and the second water feed pump is provided, and the program is ended after the water path operation is stabilized.
It should be noted that, in practical application, a preferred embodiment is provided:
the third preset rotating speed is 20rpm;
the second time period is 10s.
Before the water pressure of the first water supply channel and the water supply main pipe is obtained, the method further comprises the following steps: detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW before and keeping stable; detecting and confirming that the water supply flow of the boiler is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃; and detecting and confirming that the first water supply pump is ended.
In some embodiments, as shown in fig. 2, the method for combining the water supply pumps of the thermal power plant comprises the following steps:
step S201, start.
Step S202, calculating the difference between the pressure of the water supply main pipe and the outlet pressure of the first water supply pump, if the result is 1.5 MPa-2 MPa, executing S203, if the result is more than 2MPa, executing S204, and if the result is less than 1.5MPa, executing S205.
Step S203, the power gate is turned on, and S206 is performed.
Step S204, the first water supply pump speed is increased by 20rpm, and the time is delayed for 5S, and S202 is executed.
Step S205, the first water supply pump speed is reduced by 20rpm, and the time is delayed for 5S, and S202 is executed.
Step S206, calculating the difference between the rotation speeds of the first water supply pump and the second water supply pump, and executing S207 if the result is less than 0rpm and the superheat degree is more than 6 ℃; if the result is not less than 0rpm, S208 is performed.
Step S207, the rotation speed of the first water supply pump is increased by 20rpm, and the time is delayed for 10S, and then S206 is executed.
Step S208, ends.
2. Method for withdrawing water supply pump of thermal power plant
Acquiring the water pressure of the first water supply channel and the water supply main pipe, judging the difference value between the water supply main pipe and the first water supply channel, and closing the electric door if the difference value is within the first preset range; if the difference value is in the second preset range, reducing the rotating speed of the first water supply pump by a first preset rotating speed value; wherein the first preset range is greater than the second preset range.
It should be noted that, in practical application, one preferred embodiment of the above values is:
the first preset range is more than or equal to 2MPa;
the third preset range is that the water pressure difference is less than 2MPa;
the first preset rotating speed value is 20rpm;
the first duration is 10s.
After the electric door is closed, acquiring the rotating speed of the first water supply pump, and judging whether the rotating speed is in a second preset range or not, wherein the second preset range is 3600rpm; if the rotating speed of the first water supply pump is larger than 3600rpm, the rotating speed is reduced to 3600rpm; if the rotating speed of the first water supply pump is less than 3600rpm, the rotating speed is increased to 3600rpm.
Before the water pressure of the first water supply channel and the water supply main pipe is obtained, the method further comprises the following steps: detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW before and keeping stable; detecting and confirming that the water supply flow of the boiler is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃; detecting and confirming that the first water supply pump warms up; detecting and confirming that the first feed pump and the electric door are fully opened.
In some embodiments, as shown in fig. 3, the method for de-pumping the feedwater pump of the thermal power plant includes the steps of:
step S301, start.
Step S302, calculating the difference between the pressure of the water supply main pipe and the outlet pressure of the first water supply pump, if the result is more than or equal to 2MPa, executing step S303, and if the result is less than 2MPa, executing step S304.
Step S303, the power door is closed, and step S305 is performed.
Step S304, the first water supply pump speed is reduced by 20rpm, and the time is delayed for 10S, and then step S303 is executed.
Step S305, increasing the first feed pump speed to 3600rpm.
Step S306, ends.
The two processes are written into the DCS in a modular mode, man-machine interaction is realized in the form of an operation window, the operation amount of personnel is reduced, the operation risk is reduced, and the automation rate is improved.
By applying the technical scheme, the control method of the water supply pump of the thermal power plant is utilized, based on the automatic control characteristic of the thermal power plant, the water supply pump is completed by one key from the aspects of intelligence, automation and safety, the operation amount of personnel is reduced, the safety risk is reduced, the automation rate is improved, and a foundation is laid for realizing one-key start and stop in the future.
The invention has the beneficial effects that:
1) Effectively solves the safety risk brought by misoperation of personnel.
2) The operation efficiency is improved, and the working time is saved.
3) And the automatic input rate is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The control method of the water supply pump of the thermal power plant is applied to a thermal power unit, and is characterized in that the thermal power unit comprises:
a boiler;
the first water supply path comprises a first water supply pump and an electric door;
the first water supply channel is connected with the first water supply channel in parallel;
the first water supply path is connected with the water supply main pipe through the electric door;
the method comprises a pump combining method, specifically comprises the following steps:
acquiring the water pressure of the first water supply channel and the water supply main pipe, judging the water pressure difference value of the water supply main pipe and the first water supply channel, and opening the electric door if the water pressure difference value is in a first preset range;
acquiring the rotating speed of the first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range;
the method comprises the steps of obtaining water pressure of a first water supply channel and a water supply main pipe, judging a water pressure difference value of the water supply main pipe and the first water supply channel, and opening an electric door if the water pressure difference value is in a first preset range, wherein the specific steps are as follows:
if the water pressure difference value is in the first preset range, opening the electric door;
if the water pressure difference value is in a third preset range, increasing the rotating speed of the first water supply pump by a first preset rotating speed value;
if the water pressure difference value is in a fourth preset range, reducing the rotating speed of the first water supply pump by a second preset rotating speed value;
the third preset range is larger than the first preset range, and the first preset range is larger than the fourth preset range;
the method comprises the steps of obtaining the rotating speed of a first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range, specifically:
after the electric door is opened, acquiring the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump, and judging whether the difference value between the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump is in the second preset range, wherein the second preset range is that the difference value between the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump is larger than or equal to zero;
if yes, ending the control;
if not, the rotating speed of the first water feeding pump is increased by a third preset rotating speed value, the second time is continuously operated, and whether the difference between the rotating speed of the first water feeding pump and the rotating speed of the second water feeding pump is in the second preset range is judged again.
2. The control method according to claim 1, wherein the rotational speed of the first feed pump is increased by a first preset rotational speed value, after which the method further comprises:
and operating for a first time period according to the first preset rotating speed value, and then judging the water pressure difference value between the water supply main pipe and the first water supply channel again.
3. The control method according to claim 1, wherein the rotational speed of the first feed pump is reduced by a second preset rotational speed value, after which the method further comprises:
and operating the first time period with the second preset rotating speed value, and then judging the water pressure difference value between the water supply main pipe and the first water supply channel again.
4. The control method according to claim 1, further comprising a pump-off method, in particular: acquiring the water pressure of the first water supply channel and the water supply main pipe, judging the water pressure difference value of the water supply main pipe and the first water supply channel, and closing the electric door if the water pressure difference value is in a first preset range; acquiring the rotating speed of the first water supply pump, judging whether the rotating speed is in a second preset range, if not, increasing or decreasing the rotating speed until the rotating speed is in the second preset range; the method comprises the steps of obtaining water pressure of a first water supply channel and a water supply main pipe, judging a water pressure difference value of the water supply main pipe and the first water supply channel, and closing an electric door if the water pressure difference value is in a first preset range, wherein the specific steps are as follows:
if the water pressure difference value is within the first preset range, closing the electric door;
if the water pressure difference value is in a third preset range, reducing the rotating speed of the first water supply pump by a first preset rotating speed value;
wherein the first preset range is greater than the third preset range.
5. The control method according to claim 4, wherein the rotational speed of the first feed pump is reduced by a first preset rotational speed value, and thereafter the method further comprises:
and operating for a first time period according to the first preset rotating speed value, and then judging the water pressure difference value between the water supply main pipe and the first water supply channel again.
6. The control method according to claim 4, wherein the rotational speed of the first feed pump is obtained, and whether the rotational speed is within a second preset range is determined, and if not, the rotational speed is increased or decreased until the rotational speed is within the second preset range, specifically:
after the electric door is closed, acquiring the rotating speed of the first water supply pump, and judging whether the rotating speed is in a second preset range or not, wherein the second preset range is 3600rpm;
if the rotating speed of the first water supply pump is larger than 3600rpm, the rotating speed is reduced to 3600rpm;
if the rotating speed of the first water supply pump is less than 3600rpm, the rotating speed is increased to 3600rpm.
7. The control method according to claim 1, wherein the water pressure of the first water supply passage and the water supply main is obtained, and before that, the method further comprises:
detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW, and keeping stable;
detecting and confirming that the boiler water supply flow is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃;
and detecting and confirming that the first water supply pump is ended.
8. The method of claim 4, wherein prior to obtaining the water pressure of the first water supply line and the water supply header, the method further comprises:
detecting and confirming that the load range of the thermal power generating unit is 285 MW-295 MW, and keeping stable;
detecting and confirming that the boiler water supply flow is between 850t/h and 950t/h and the superheat degree is between 6 ℃ and 15 ℃;
detecting and confirming that the first water supply pump warms up;
detecting and confirming that the first feed pump and the electric door are fully opened.
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