CN110848124B - Automatic switching control method and device for electric pump and steam pump and storage medium - Google Patents
Automatic switching control method and device for electric pump and steam pump and storage medium Download PDFInfo
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- CN110848124B CN110848124B CN201911106302.6A CN201911106302A CN110848124B CN 110848124 B CN110848124 B CN 110848124B CN 201911106302 A CN201911106302 A CN 201911106302A CN 110848124 B CN110848124 B CN 110848124B
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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
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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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
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
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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
- F04B49/22—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 means of valves
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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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- 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
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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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)
- Computer Hardware Design (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
An automatic switching control method for electric pump and steam pump, its equipment and storage medium are disclosed. The application discloses an automatic switching control method for an electric pump and a steam pump in a supercritical unit water supply system, wherein when a switching instruction is received and the operating parameters of a unit are determined not to meet requirements, a stopping instruction is sent in time; otherwise, controlling to open an adjusting valve of the cold-steam secondary steam header and an electric valve of a middle tap of the steam pump; then controlling and increasing the rotating speed of the air pump, and adjusting the working mode of each device; the electric pump is controlled and regulated in a recycling mode until the pressure of the outlet of the electric pump is 1MPa lower than the pressure of the water supply main pipe; and finally, judging the set value and the working mode of the water supply flow of the steam pump so as to open the recirculation regulating valve of the electric pump to 100 percent and close the scoop pipe of the electric pump to 8 percent. The method can be realized by a program without manual operation. The method can reduce the control difficulty and uncontrollable factors of the boiler feed water flow, improve the switching success rate and reduce the operation amount. In addition, the application also correspondingly provides the control device and the readable storage medium, and the effects are as above.
Description
Technical Field
The application relates to the field of application of thermal power plants, in particular to an automatic switching control method and device for an electric pump and a steam pump and a storage medium.
Background
The water supply system of the supercritical unit comprises an electric pump with the capacity of 30 percent, a steam-driven water supply pump with the capacity of 100 percent, a steam pump with the capacity of 100 percent, a deaerator, a high-pressure heater, a boiler water supply bypass adjusting valve, an economizer, a water wall and a steam-water separator, wherein one end of the steam pump is connected with the deaerator, the other end of the steam pump is simultaneously connected with a high heater, the high heater is connected with the economizer in series, the water wall and the steam-water separator, the electric pump adjusts the rotating speed by a scoop tube, and the steam pump controls the rotating speed by a steam turbine.
At the initial stage of unit starting, when the load is below 30%, the boiler feed water is boosted by an electric pump, then flows through a high-pressure heater and a boiler feed water bypass regulating valve in sequence, and then enters an economizer, a water-cooled wall and a steam-water separator, superheated steam separated by the steam-water separator flows through a boiler superheating heat exchanger and then is sent to a steam turbine to do work, one part of water separated by the steam-water separator is sent to the economizer again through a boiler water circulating pump, and the other part of water enters a boiler drainage flash tank to be condensed and then is sent to a condenser and then enters the deaerator again. When the unit load is lower than 25%, the water supply flow is low, when the steam pump operates under the water supply flow, the rotating speed of a steam turbine of the steam pump is too low, the operation is unstable, and the steam pump can be incorporated into a water supply system to operate only when the unit load is larger than 25%. The load of the unit is gradually increased, when the load is in a 25% -30% interval, the electric pump reaches the maximum output, at the moment, the steam pump needs to be merged into the water supply system, and the electric pump is withdrawn from the water supply system and is stopped.
However, in a conventional thermal power plant, an operator is usually required to switch between the electric pump and the steam pump in the unit by manually switching, for example, increasing the rotation speed of the steam pump and decreasing the rotation speed of the electric pump by manually operating a corresponding button or handle, and gradually removing the electric pump after the steam pump is incorporated into a water supply system, but when the electric pump and the steam pump are manually switched, the following problems may occur: firstly, the feed water flow of the boiler is difficult to control stably and not to fluctuate in the switching process; secondly, in the switching process, operators are required to regulate and control a large number of parameters such as steam pump rotating speed, steam pump water supply flow, electric pump rotating speed, electric pump outlet flow, steam pump outlet pressure, electric pump outlet pressure, water supply main pipe pressure, steam pump water supply flow, electric pump current, boiler water supply bypass regulating valve opening degree, boiler water supply flow and the like, switching failure can be caused when each parameter is out of control, the water supply flow can be greatly fluctuated after the switching failure, further, the boiler water supply flow is low in protection action to trigger tripping of a unit, the switching failure rate is high, and the operation amount is large; thirdly, the manual operation needs to depend on the operation experience of operators, the uncontrollable factors are high, and the culture difficulty of the operators is high.
Therefore, the problem that how to overcome the problems of great difficulty in controlling the boiler feed water flow, high switching failure rate, great operation amount and high uncontrollable factors caused by the fact that the switching between the electric pump and the steam pump of the unit is realized by adopting a manual mode is a problem to be solved urgently by the technical staff in the field.
Disclosure of Invention
The application provides an automatic switching control method for an electric pump and a steam pump in a supercritical unit water supply system, and solves the problems that how to realize switching between the unit electric pump and the steam pump by adopting a manual mode in the prior art causes large difficulty in boiler water supply flow control, high switching failure rate, large operation amount and high uncontrollable factors.
In order to solve the technical problem, the application provides an automatic switching control method for an electric pump and a steam pump in a water supply system of a supercritical unit, which comprises the following steps:
when an electric pump and steam pump switching instruction is received, judging whether the operation parameters of the unit meet the requirements or not;
if not, sending a stop instruction, and controlling to stop switching the electric pump and the steam pump;
if so, controlling to open the valve of the cold-to-auxiliary steam header, opening the valve of the cold-to-auxiliary steam header to 5% of opening degree, and controlling to open the electric valve of the middle tap of the steam pump;
controlling and increasing the rotating speed of the steam pump until the difference between the outlet pressure of the steam pump and the pressure of a water supply main pipe is less than 1MPa, and opening an electric door at the outlet of the steam pump;
continuously controlling and increasing the rotating speed of the steam pump until the difference between the outlet pressure of the steam pump and the pressure of the water supply main pipe is less than 0.5 MPa;
switching an electric pump scoop tube, a boiler water feeding bypass regulating valve and an electric pump recirculation regulating valve to a manual control mode, switching the steam pump to an automatic flow control mode, and recording a first current inlet flow and a first current of the electric pump;
controlling to increase the electric pump recirculation regulating valve, stopping continuously increasing the opening of the electric pump recirculation regulating valve when a second current is larger than the first current or a second current inlet flow is larger than the first current inlet flow, and controlling to decrease the opening of the electric pump scoop tube, and repeating the operation until the outlet pressure of the electric pump is lower than the pressure of the water supply main tube by 1 MPa;
judging whether the deviation between the set value of the water supply flow of the steam pump and the actual water supply flow value is more than 50t/h or whether the steam pump is manually started;
if not, the electric pump recirculation regulating valve is opened to 100%, and the electric pump scoop tube is closed to 8%.
Preferably, the step of judging whether the operating parameters of the unit meet the requirements is as follows:
judging whether the boiler feed water flow is within 1050t/h-1150t/h, whether a boiler feed water bypass regulating valve is in an automatic mode, whether a boiler feed water main electric valve is closed, whether an electric pump starts to operate, whether an electric pump recirculation regulating valve is in an automatic position, whether an electric pump outlet electric door is opened, whether a steam pump is in a DCS remote control mode, and whether the steam pump rotating speed is greater than 2750 r/min.
In order to solve the above technical problem, the present application further provides a control device corresponding to an electric pump and steam pump automatic switching control method in a supercritical unit water supply system, including:
a memory for storing a computer program;
and the processor is used for executing the calculation program to realize the steps of the automatic switching control method of the electric pump and the steam pump in the water supply system of the supercritical unit.
In order to solve the technical problem, the present application further provides a computer-readable storage medium corresponding to the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit, where the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement any one of the steps of the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit.
Compared with the prior art, according to the automatic switching control method for the electric pump and the steam pump in the supercritical unit water supply system, when the electric pump and the steam pump switching instruction is received and the running parameters of the unit are determined to be not in accordance with the requirements, a stopping instruction is sent in time to control the electric pump and the steam pump to be stopped and switched; otherwise, controlling to open an adjusting valve of the cold-steam secondary steam header and an electric valve of a middle tap of the steam pump; then controlling and increasing the rotating speed of the steam pump, and adjusting the working modes of the electric pump scoop tube, the boiler water feeding bypass adjusting valve, the electric pump recirculation adjusting valve and the steam pump; then, controlling and adjusting the electric pump recirculation valve repeatedly until the outlet pressure of the electric pump is 1MPa lower than the pressure of the water supply main pipe; and finally, judging the set value of the water supply flow of the steam pump and the working mode of the steam pump so as to open the recirculation regulating valve of the electric pump to 100 percent and close the electric pump scoop pipe to 8 percent. In actual operation, the process can be realized through a corresponding program, and the switching between the electric pump and the steam pump can be realized in a mode of manually operating a corresponding button or handle. Therefore, the method can reduce the control difficulty and uncontrollable factors of the boiler feed water flow, improve the switching success rate and reduce the operation amount. In addition, the application also provides an automatic switching control device for the electric pump and the steam pump in the water supply system of the supercritical unit and a computer readable storage medium, and the effects are as above.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without making any inventive changes.
Fig. 1 is a flowchart of an electric pump and steam pump automatic switching control method in a supercritical unit water supply system according to an embodiment of the present invention;
fig. 2 is a schematic composition diagram of an automatic switching control device for an electric pump and a steam pump in a water supply system of a supercritical unit according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings.
The core of the application is to provide a flow chart of an electric pump and a steam pump automatic switching control method in a supercritical unit water supply system, and the problems that how to realize switching between a unit electric pump and a steam pump by adopting a manual mode in the prior art causes large difficulty in boiler water supply flow control, high switching failure rate, large operation amount and high uncontrollable factors can be solved.
Fig. 1 is a flowchart of an automatic switching control method for an electric pump and a steam pump in a water supply system of a supercritical unit according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
s101: when an electric pump and steam pump switching instruction is received, whether the operation parameters of the unit meet requirements is judged, if not, the step S102 is carried out, and if yes, the step S103 is carried out.
As a preferred embodiment, step S101 is specifically:
whether the boiler feed water flow is within 1050t/h-1150t/h, whether a boiler feed water bypass regulating valve is in an automatic mode, whether a boiler feed water main electric valve is closed, whether an electric pump starts to operate, whether an electric pump recirculation regulating valve is in an automatic position, whether an electric pump outlet electric door is opened, whether a steam pump is in a DCS remote control mode, and whether the steam pump rotating speed is greater than 2750r/min is judged. That is, when these conditions are satisfied, the process proceeds to step S103.
S102: and sending a stop instruction, and controlling to stop switching the electric pump and the steam pump.
S103: and controlling to open the regulating valve of the cold-to-auxiliary steam header, opening the regulating valve of the cold-to-auxiliary steam header to 5% of opening degree, and controlling to open the electric valve of the middle tap of the steam pump.
S104: and controlling to increase the rotating speed of the steam pump until the difference between the pressure of the outlet of the steam pump and the pressure of the water supply main pipe is less than 1MPa, and opening an electric door at the outlet of the steam pump.
S105: and continuously controlling and increasing the rotating speed of the steam pump until the difference between the outlet pressure of the steam pump and the pressure of the water supply main pipe is less than 0.5 MPa.
In practical application, the rotation speed of the air pump can be increased according to a set speed, and the set speed can be determined according to practical conditions, and the invention is not limited.
S106: and switching the electric pump scoop tube, the boiler water feeding bypass regulating valve and the electric pump recirculation regulating valve to a manual control mode, switching the steam pump to an automatic flow control mode, and recording the first current inlet flow and the first current of the electric pump.
S107: and controlling to open the recirculation regulating valve of the large electric pump, stopping continuously opening the recirculation regulating valve of the large electric pump when the second current is larger than the first current or the second current inlet flow is larger than the first current inlet flow, controlling to close the opening of the scoop tube of the small electric pump, and repeating the operation until the outlet pressure of the electric pump is lower than the pressure of the water supply main tube by 1 MPa.
Specifically, the first current inlet flow and the first current refer to the corresponding flow and current when the steam pump is switched to the automatic flow control mode, and the second current and the second current inlet flow refer to the corresponding flow and current after the electric pump recirculation regulating valve is controlled to be opened. In practical application, the electric pump recirculation regulating valve can be opened according to a set speed, the opening degree of the electric pump scoop tube can be closed according to the set speed, and the set speed can be determined according to practical conditions. After this step is completed, the electric pump has exited the watering system. And (3) if the deviation between the set value of the water supply flow of the steam pump and the actual water supply flow is more than 50t/h or the steam pump is switched to manual operation in the process of withdrawing the electric pump, locking (forbidding) the opening of the recirculation regulating valve of the electric pump and closing the scoop tube of the electric pump.
S108: and judging whether the deviation between the set value of the water feeding flow of the steam pump and the actual water feeding flow value is more than 50t/h or whether the steam pump is switched to manual operation, if not, entering the step S109, and if so, locking (forbidding) the opening of the recirculation regulating valve of the electric pump and the closing of the scoop pipe of the electric pump.
S109: the electric pump recirculation regulating valve is opened to 100%, and the electric pump scoop tube is closed to 8%.
The method can be realized by corresponding programs, the opening degree of a cold-recycling auxiliary steam header, the opening degree of an electric pump recycling adjusting valve and the opening degree of an electric pump scoop tube can be realized by controlling the sliding of the sliding rheostat by corresponding control programs, and the sliding rheostat can be installed at a corresponding position.
After the steps are finished, the switching between the electric pump and the steam pump is finished, and in practical application, the corresponding speed increasing rate of the steam pump, the opening rate of the electric pump recirculation regulating valve and the closing rate of the electric pump scoop tube can be set according to the working characteristics of the steam pump and the electric pump.
The switching method in the embodiment of the application can reduce errors in the manual operation process to a great extent and improve safety. The supercritical unit has strict requirements on the water supply flow control, the water supply flow is triggered to be low due to too little water, the protection is caused, the unit trips, and the water-coal ratio imbalance steam temperature is rapidly reduced due to too much water, so that the water impact of a steam turbine is caused. When the electric pump and the steam pump are required to be switched, the control system can automatically complete the pump switching operation according to the set logic after an operator only needs to start the pump switching program for control. The operation efficiency can be improved, and the starting time of the unit is reduced. In the manual switching process, because personnel need to continuously click the mouse manually and observe parameter change, the operation speed is far lower than that of the automatic execution of a program, and the control method can shorten the pump switching operation time. The method can lay a foundation for realizing the unit-level auto-start APS. The unit level automatic start-stop control system (APS) is the mainstream trend of thermal power generating unit construction at present, and the whole automatic water supply can be realized after the electric pump is switched automatically, so that the control requirement of the APS is finally met.
According to the method for controlling automatic switching of the electric pump and the steam pump in the supercritical unit water supply system, when the electric pump and the steam pump switching instruction is received and the operating parameters of the unit do not meet the requirements are determined, a stopping instruction is sent in time to control the stopping of the switching of the electric pump and the steam pump; otherwise, controlling to open an adjusting valve of the cold-steam secondary steam header and an electric valve of a middle tap of the steam pump; then controlling and increasing the rotating speed of the steam pump, and adjusting the working modes of the electric pump scoop tube, the boiler water feeding bypass adjusting valve, the electric pump recirculation adjusting valve and the steam pump; then, controlling and adjusting the electric pump recirculation valve repeatedly until the outlet pressure of the electric pump is 1MPa lower than the pressure of the water supply main pipe; and finally, judging the set value of the water supply flow of the steam pump and the working mode of the steam pump so as to open the recirculation regulating valve of the electric pump to 100 percent and close the electric pump scoop pipe to 8 percent. In actual operation, the process can be realized through a corresponding program, and the switching between the electric pump and the steam pump can be realized in a mode of manually operating a corresponding button or handle. Therefore, the method can reduce the control difficulty and uncontrollable factors of the boiler feed water flow, improve the switching success rate and reduce the operation amount. In addition, the application also provides an automatic switching control device for the electric pump and the steam pump in the water supply system of the supercritical unit and a computer readable storage medium, and the effects are as above.
The above embodiment of the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit is described in detail, and based on the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit described in the above embodiment, the embodiment of the present invention further provides a device for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit corresponding to the method. Since the embodiment of the device part and the embodiment of the method part correspond to each other, the embodiment of the device part is described with reference to the embodiment of the method part, and is not described again here.
Fig. 2 is a schematic diagram illustrating an automatic switching control apparatus for an electric pump and a steam pump in a water supply system of a supercritical unit according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes a memory 201 and a processor 202.
A memory 201 for storing a computer program;
the processor 202 is configured to execute a computer program to implement the steps of the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit according to any one of the embodiments.
The application provides a charge pump steam pump automatic switch controlgear among supercritical unit water supply system can reduce boiler feed water flow's the control degree of difficulty and uncontrollable factor, improves and switches the success rate, and the handling capacity is little.
The above embodiment of the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit is described in detail, and based on the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit described in the above embodiment, the embodiment of the present invention further provides a computer readable storage medium corresponding to the method. Since the embodiment of the computer-readable storage medium portion and the embodiment of the method portion correspond to each other, please refer to the embodiment of the method portion for describing the embodiment of the computer-readable storage medium portion, which is not described herein again.
A computer readable storage medium, a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the steps of the method for controlling the automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit provided in any one of the above embodiments.
According to the computer-readable storage medium provided by the invention, the processor can read the program stored in the readable storage medium, so that the method for automatically switching and controlling the electric pump and the steam pump in the supercritical unit water supply system provided by any one of the embodiments can be realized, the control difficulty and the uncontrollable factors of the boiler water supply flow can be reduced, the switching success rate is improved, and the operation amount is small.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.
Claims (3)
1. An electric pump and steam pump automatic switching control method in a supercritical unit water supply system is characterized by comprising the following steps:
when an electric pump and steam pump switching instruction is received, whether the boiler feed water flow is within 1050t/h-1150t/h, whether a boiler feed water bypass regulating valve is in an automatic mode, whether a boiler feed water main electric valve is closed, whether an electric pump starts to operate, whether an electric pump recirculation regulating valve is in an automatic position, whether an electric pump outlet electric door is opened, whether a steam pump is in a DCS remote control mode, and whether the steam pump rotating speed is greater than 2750r/min are judged;
if not, sending a stop instruction, and controlling to stop switching the electric pump and the steam pump;
if so, controlling to open the valve of the cold-to-auxiliary steam header, opening the valve of the cold-to-auxiliary steam header to 5% of opening degree, and controlling to open the electric valve of the middle tap of the steam pump;
controlling and increasing the rotating speed of the steam pump until the difference between the outlet pressure of the steam pump and the pressure of a water supply main pipe is less than 1MPa, and opening an electric door at the outlet of the steam pump;
continuously controlling and increasing the rotating speed of the steam pump until the difference between the outlet pressure of the steam pump and the pressure of the water supply main pipe is less than 0.5 MPa;
switching an electric pump scoop tube, a boiler water feeding bypass regulating valve and an electric pump recirculation regulating valve to a manual control mode, switching the steam pump to an automatic flow control mode, and recording a first current inlet flow and a first current of the electric pump;
controlling to increase the electric pump recirculation regulating valve, stopping continuously increasing the opening of the electric pump recirculation regulating valve when a second current is larger than the first current or a second current inlet flow is larger than the first current inlet flow, and controlling to decrease the opening of the electric pump scoop tube, and repeating the operation until the outlet pressure of the electric pump is lower than the pressure of the water supply main tube by 1 MPa;
judging whether the deviation between the set value of the water supply flow of the steam pump and the actual water supply flow value is more than 50t/h or whether the steam pump is manually started;
if not, the electric pump recirculation regulating valve is opened to 100%, and the electric pump scoop tube is closed to 8%.
2. The utility model provides an electric pump vapour pump automatic switch-over controlgear among supercritical unit water supply system which characterized in that includes:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the method for controlling automatic switching of the electric pump and the steam pump in the water supply system of the supercritical unit as claimed in claim 1.
3. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor to implement the steps of the method for controlling automatic switching of electric pump/steam pump in a supercritical unit water supply system according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921662687 | 2019-09-30 | ||
| CN201921662687X | 2019-09-30 |
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| CN110848124B true CN110848124B (en) | 2021-07-16 |
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| CN201911106302.6A Active CN110848124B (en) | 2019-09-30 | 2019-11-13 | Automatic switching control method and device for electric pump and steam pump and storage medium |
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| CN113107832B (en) * | 2021-04-25 | 2022-08-26 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113464416B (en) * | 2021-05-25 | 2022-08-23 | 西安热工研究院有限公司 | Initial parameter design method for emergency starting test of high-capacity electric pump |
| CN113669717B (en) * | 2021-07-16 | 2023-08-25 | 神华国华九江发电有限责任公司 | Method and device for automatically controlling water supply and storage medium |
| CN113685800B (en) * | 2021-08-12 | 2023-11-14 | 杭州意能电力技术有限公司 | Automatic parallel pump control system of steam-driven water supply pump based on rate self-adaption |
| CN114215730B (en) * | 2021-11-11 | 2024-04-19 | 广东红海湾发电有限公司 | Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant |
| CN114543072B (en) * | 2022-02-14 | 2023-08-29 | 上海发电设备成套设计研究院有限责任公司 | Self-treatment device system and method for water impact of water supply pipeline of thermal power generating unit |
| CN115013800B (en) * | 2022-06-16 | 2024-04-09 | 国网湖北省电力有限公司电力科学研究院 | Automatic control method for drum water level under FCB working condition of bypass-free circulating fluidized bed unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB361990A (en) * | 1930-09-03 | 1931-12-03 | Doble Steam Motors Ltd | Improvements in or relating to steam power plants |
| CN103474117A (en) * | 2013-09-03 | 2013-12-25 | 中国核电工程有限公司 | Safety supply method of auxiliary water supply system through adding of by-pass pipelines |
| CN104214760A (en) * | 2014-08-26 | 2014-12-17 | 福建省鸿山热电有限责任公司 | Control method for 600MW supercritical extraction condensing generating heat supply unit to realize no heat supply cutoff through combined starting of electric pump after single steam pump trips out |
| CN109441575A (en) * | 2018-09-30 | 2019-03-08 | 国网天津市电力公司电力科学研究院 | The method of steam combined cycle power generating unit heat supply period heat network system operation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03241206A (en) * | 1990-02-19 | 1991-10-28 | Hitachi Ltd | Water supplying control device |
| CN100561043C (en) * | 2008-11-12 | 2009-11-18 | 陕西天程石化设备有限公司 | A kind of boiler feedwater flow control and pressure compensating system |
| CN101451709B (en) * | 2008-12-31 | 2011-02-02 | 柴庆宣 | Piping-main scheme boiler load coordinating control method |
| CN102252312B (en) * | 2011-05-16 | 2013-02-27 | 上海发电设备成套设计研究院 | Full-process automatic control system for supercritical unit water supply system |
-
2019
- 2019-11-13 CN CN201911106302.6A patent/CN110848124B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB361990A (en) * | 1930-09-03 | 1931-12-03 | Doble Steam Motors Ltd | Improvements in or relating to steam power plants |
| CN103474117A (en) * | 2013-09-03 | 2013-12-25 | 中国核电工程有限公司 | Safety supply method of auxiliary water supply system through adding of by-pass pipelines |
| CN104214760A (en) * | 2014-08-26 | 2014-12-17 | 福建省鸿山热电有限责任公司 | Control method for 600MW supercritical extraction condensing generating heat supply unit to realize no heat supply cutoff through combined starting of electric pump after single steam pump trips out |
| CN109441575A (en) * | 2018-09-30 | 2019-03-08 | 国网天津市电力公司电力科学研究院 | The method of steam combined cycle power generating unit heat supply period heat network system operation |
Non-Patent Citations (1)
| Title |
|---|
| "全程给水自动控制策略与调试";钟振林等;《华东电力》;19971231(第12期);第39-42页 * |
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