CN112923350B - Automatic parallel method for feed pumps of thermal power plant - Google Patents
Automatic parallel method for feed pumps of thermal power plant Download PDFInfo
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- CN112923350B CN112923350B CN202110117039.1A CN202110117039A CN112923350B CN 112923350 B CN112923350 B CN 112923350B CN 202110117039 A CN202110117039 A CN 202110117039A CN 112923350 B CN112923350 B CN 112923350B
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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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
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Abstract
The invention discloses an automatic parallel method of feed pumps of a thermal power plant, which comprises the following steps: respectively acquiring the working rotating speed of a first water supply pump and the working rotating speed of a second water supply pump; calculating a working rotating speed difference value according to the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump; if the working rotating speed difference value exceeds a threshold value, starting an automatic parallel mode; and if the water level of the boiler drum is within a safe range value, adjusting the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump until the working rotating speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode. The invention adopts an automatic parallel mode, and reduces the failure rate of the thermal generator set in operation.
Description
Technical Field
The invention relates to the technical field of power plant boiler water supply, in particular to an automatic parallel method for water supply pumps of a thermal power plant.
Background
At present, in actual power plant production, a water supply pump is a necessary device for water supply of a boiler drum, in order to increase the economy of a power plant, two steam-driven water supply pumps are normally adopted and respectively carry 50% of load to ensure water supply of the drum, one electric water supply pump (rated 35% of load) is used as a standby water supply pump, and when one steam-driven water supply pump fails and stops running, the electric water supply pump is merged into a water supply system to ensure water supply of the drum. With the increasing popularization of bidding and surfing in power plant areas, more and more units participating in frequency modulation are provided, the number of start and stop times of the units is more and more frequent, the parallel operation of boiler water feeding pumps is correspondingly increased, at present, the rotation speed of two pumps is manually adjusted to be matched, then automatic tracking steam drum water level adjustment is carried out, a certain steam-driven water feeding pump fails and stops running, when the electric water feeding pump is started in a standby interlocking mode, the output of the electric water feeding pump is manually adjusted by a person to be matched with the running steam-driven water feeding pump, the process time is long, the water level fluctuation is large, the possibility of misoperation of the person is increased, the level of the person is different, the accident rate of water shortage or water fullness of the steam drum is increased, and the boiler MFT action jumps in serious cases.
Disclosure of Invention
The invention aims to provide an automatic parallel method of feed pumps of a thermal power plant, which adopts an automatic parallel mode, reduces the artificial operation error rate and reduces the unit failure rate.
In order to achieve the above object, an embodiment of the present invention provides an automatic parallel method for feed pumps in a thermal power plant, including:
respectively acquiring the working rotating speed of a first water supply pump and the working rotating speed of a second water supply pump;
calculating a working rotating speed difference value according to the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump;
if the working rotating speed difference value exceeds a threshold value, starting an automatic parallel mode;
and if the water level of the boiler drum is within a safe range value, adjusting the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump until the working rotating speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode.
Preferably, if the working rotation speed difference exceeds a threshold, the automatic parallel mode is started, including:
comparing the working rotating speed of the first water supply pump with the working rotating speed of the second water supply pump;
if the working rotating speed of the first water supply pump is greater than that of the second water supply pump, adjusting a working rotating speed instruction by adopting a preset first adjusting parameter group;
and if the working rotating speed of the second water supply pump is greater than that of the first water supply pump, adjusting a working rotating speed instruction by adopting a preset second adjusting parameter group.
Preferably, the automatic parallel mode includes detecting a boiler drum water level, and if the boiler drum water level is within a safe range value, adjusting the operating rotation speed of the first feed water pump and the operating rotation speed of the second feed water pump until the operating rotation speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode, including:
the first adjusting parameter group comprises a first normal water level adjusting parameter, a first low water level adjusting parameter, a first high water level adjusting parameter, a first main feedwater flow and a main steam flow deviation value;
the automatic parallel mode also comprises the step of detecting the difference value between the main water feeding flow and the main steam flow;
if the steam drum water level is within a safe range value and the difference value between the main feedwater flow and the main steam flow is within a normal value, adopting the first normal water level adjustment parameter;
if the steam drum water level exceeds a safety range value and the difference value between the main feedwater flow and the main steam flow is not within a normal value, adopting the first high water level adjustment parameter;
and if the steam drum water level is lower than the safety range value and the difference value between the main feedwater flow and the main steam flow is not in a normal value, adopting the first low water level adjustment parameter.
Preferably, the automatic parallel mode includes detecting a boiler drum water level, and if the boiler drum water level is within a safe range, adjusting the operating rotation speed of the first feed water pump and the operating rotation speed of the second feed water pump until the operating rotation speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode, and further includes:
the first normal water level adjusting parameter reduces the working rotating speed instruction of the first water supply pump at the rate of 1% per second, and increases the working rotating speed instruction of the second water supply pump at the rate of 1% per second;
the first high water level adjusting parameter is a command for locking and increasing the working rotating speed of the second water supply pump, and the command for reducing the working rotating speed of the first water supply pump at the rate of 1 percent per second;
the first low water level adjusting parameter is a command of locking and reducing the working rotating speed of the first water supply pump, and the command of increasing the working rotating speed of the second water supply pump at a rate of 1% per second.
Preferably, the second adjusting parameter group includes a second normal water level adjusting parameter, a second low water level adjusting parameter, a second high water level adjusting parameter, a second main feedwater flow and main steam flow deviation value;
if the water level of the steam drum is within a safe range value and the deviation between the main water supply flow and the main steam flow is within a normal value, adopting the second normal water level adjusting parameter;
if the steam drum water level exceeds a safety range value and the deviation between the main water supply flow and the main steam flow is not within a normal value, adopting the second high water level adjusting parameter;
and if the water level of the steam drum is lower than the safety range value and the deviation between the main water supply flow and the main steam flow is within a normal value, adopting the second low water level adjusting parameter.
Preferably, the method further comprises the step of,
the second normal water level adjusting parameter is a working rotating speed instruction for reducing the second water supply pump at the rate of 1% per second and increasing the first water supply pump at the rate of 1% per second;
the second high water level adjusting parameter is a command for locking and increasing the working rotating speed of the first water supply pump, and the command for reducing the working rotating speed of the second water supply pump at the rate of 1 percent per second;
and the second low water level adjusting parameter is a command for locking and reducing the working rotating speed of the second water supply pump, and a command for increasing the working rotating speed of the first water supply pump at a rate of 1% per second.
The embodiment of the invention also provides computer terminal equipment which comprises one or more processors and a memory. A memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method for automatically paralleling feedwater pumps of a thermal power plant as described in any of the above embodiments.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method for automatically paralleling feedwater pumps of a thermal power plant according to any of the above embodiments.
The embodiment of the invention realizes the automatic parallel of the steam-driven water feeding pumps, and the working rotating speed of the water feeding pumps, the water level of the steam pocket, the main water feeding flow and the main steam flow are used as judgment bases to carry out the parallel of the steam-driven water feeding pumps, thereby reducing various parallel preparation works, accelerating the parallel speed of the water feeding pumps, reducing the possibility of manual misoperation and reducing the occurrence rate of unit faults.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an automatic parallel method for feed pumps of a thermal power plant according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an automatic parallel method for a feedwater pump of a thermal power plant according to another embodiment of the present invention;
fig. 3 is a schematic flow chart of an automatic parallel method of feed pumps of a thermal power plant according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides an automatic parallel method for feed pumps of a thermal power plant, including:
s101, respectively obtaining the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump.
And S102, calculating a working rotation speed difference value according to the working rotation speed of the first water supply pump and the working rotation speed of the second water supply pump.
And S103, if the working rotating speed difference value exceeds a threshold value, starting an automatic parallel mode.
And S104, detecting the water level of a boiler drum in the automatic parallel mode, if the water level of the boiler drum is within a safe range value, adjusting the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump until the working rotating speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode.
Referring to fig. 2, specifically, the working rotation speeds of the first water feed pump and the second water feed pump are collected, the working rotation speed difference value of the first water feed pump and the second water feed pump is calculated, the working rotation speed difference value is compared with a preset parallel starting rotation speed difference value of the water feed pumps, if the working rotation speed difference value is larger than the parallel starting rotation speed difference value of the water feed pumps, a parallel program of the water feed pumps is started, an original unit water feed pump adjusting system is locked until the parallel program of the water feed pumps is completed, otherwise, the working rotation speed difference value is continuously compared with the parallel starting rotation speed difference value of the water feed pumps, and the original unit adjusting system is kept.
Whether the water level of a boiler drum is within a preset safety range or not is detected, the difference value of the main feed water flow and the main steam flow is used as auxiliary observation to prevent false water level, if the water level is not within the safety range, the working rotating speed of the first feed water pump and the working rotating speed of the second feed water pump are adjusted to reach the safety range, and if the water level is within the safety range, the working rotating speed of the first feed water pump and the working rotating speed of the second feed water pump are directly adjusted until the working rotating speed of the first feed water pump and the working rotating speed of the second feed water pump are smaller than or equal to the preset difference value of the parallel stop rotating speeds of the feed water pumps.
Before the water level of a boiler drum is detected, the working rotating speeds of a first water supply pump and a second water supply pump are compared, if the working rotating speed of the first water supply pump is high, a preset first adjusting parameter set is adopted to adjust a working rotating speed instruction, and if the working rotating speed of the second water supply pump is high, a preset second adjusting parameter set is adopted to adjust the working rotating speed instruction. The first adjusting parameter group comprises a first normal water level adjusting parameter, a first low water level adjusting parameter, a first high water level adjusting parameter, a first main feedwater flow and main steam flow deviation value, if the steam drum water level is in a safety range, and the deviation between the main feedwater flow and the main steam flow is in a normal value, the first normal water level adjusting parameter is adopted, if the steam drum water level is out of the upper limit of the safety range and the deviation between the main feedwater flow and the main steam flow is not in the normal value, the first high water level adjusting parameter is adopted, and if the steam drum water level is lower than the lower limit of the safety range and the deviation between the main feedwater flow and the main steam flow is not in the normal value, the first low water level adjusting parameter is adopted.
The first normal water level adjusting parameter is a rotating speed instruction for reducing the rotating speed of the first water supply pump at a rate of 1% per second and increasing the working rotating speed of the second water supply pump at a rate of 1% per second, the first high water level adjusting parameter is a rotating speed instruction for blocking and increasing the second water supply pump, the working rotating speed instruction for reducing the first water supply pump at a rate of 1% per second, the first low water level adjusting parameter is a rotating speed instruction for blocking and decreasing the first water supply pump, and the working rotating speed instruction for increasing the second water supply pump at a rate of 1% per second.
The second adjusting parameter group comprises a second normal water level adjusting parameter, a second low water level adjusting parameter, a second high water level adjusting parameter, a second main feedwater flow and main steam flow deviation value, if the drum water level is in a safe range and the deviation between the main feedwater flow and the main steam flow is in a normal value, the second normal water level adjusting parameter is adopted, if the drum water level exceeds the upper limit of the safe range and the deviation between the main feedwater flow and the main steam flow is not in the normal value, the second high water level adjusting parameter is adopted, and if the drum water level is lower than the lower limit of the safe range and the deviation between the main feedwater flow and the main steam flow is in the normal value, the second low water level adjusting parameter is adopted. The second normal water level adjusting parameter is a rotating speed instruction for reducing the rotating speed of the second water-feeding pump at a rate of 1% per second and increasing the rotating speed of the first water-feeding pump at a rate of 1% per second, the second high water level adjusting parameter is a rotating speed instruction for locking and increasing the first water-feeding pump, the rotating speed instruction for reducing the second water-feeding pump at a rate of 1% per second, and the second low water level adjusting parameter is a rotating speed instruction for locking and decreasing the second water-feeding pump and increasing the rotating speed instruction of the first water-feeding pump at a rate of 1% per second. The difference value of the parallel starting rotating speeds of the water feeding pumps is 50 revolutions per minute, the difference value of the parallel stopping working rotating speeds of the water feeding pumps is 20 revolutions per minute, the safety range of the steam drum water level is-75 mm to +75mm, and the normal range of the deviation of the main water feeding flow and the main steam flow is less than 100 tons per hour.
Referring to fig. 3, a first water feed pump, a second water feed pump, a sensor unit, a data acquisition unit, an operation controller and a DCS system (XDPS-400) are connected in sequence, the first water feed pump and the second water feed pump are both connected with the DCS system (XDPS-400), the DCS system (XDPS-400) sends an automatic parallel instruction of the water feed pumps to the operation controller, the system starts a parallel program, the sensor unit is used for acquiring and transmitting a steam drum water level, a main water feed flow, a main steam flow, a main water feed flow and main steam flow difference value, a working rotating speed and rotating speed instruction of the first water feed pump, and a working rotating speed and rotating speed instruction of the second water feed pump, the data acquisition unit is used for preprocessing received data and transmitting, and the operation controller is used for calculating and adjusting parameters and sending the parameters to the DCS system (XDPS-400) for controlling the system to realize the parallel operation of the water feed pumps. The sensor unit comprises a first rotating speed sensor, a first rotating speed instruction sensor, a steam drum water level sensor, a main water supply flow sensor, a main steam flow sensor, a main water supply flow and main steam flow difference value sensor, a second rotating speed sensor and a second rotating speed instruction sensor. The sensor unit comprises a first rotating speed sensor group, a first rotating speed instruction sensor group, a steam pocket water level sensor group, a main water supply flow sensor group, a main steam flow sensor group, a main water supply flow and main steam flow difference sensor group, a second rotating speed sensor group and a second rotating speed instruction sensor group. By adopting the sensor group, the response of each parameter can be faster, and meanwhile, the average value of the parameters can be obtained, so that the accuracy of the parameters is improved. After the parameters are selected, the operation can be carried out according to the mode of a single sensor.
The embodiment of the invention realizes automatic parallel of the feed pumps without manual operation, can correctly judge the false water level of the steam pocket, increases the reliability of the system, uses the rotation speed and the water level of the steam pocket as main references and the deviation of the main feed water flow and the main steam flow as auxiliary references to carry out parallel of the feed pumps, reduces the preparation work of parallel money, accelerates the parallel speed, reduces the fault occurrence rate, adopts DCS control to improve the reaction speed of the system, and reduces the fluctuation of the water level of the steam pocket and the accidents caused by the false water level in the parallel process.
An embodiment of the present invention provides a computer terminal device, including one or more processors and a memory. The memory is coupled to the processor and configured to store one or more programs that, when executed by the one or more processors, cause the one or more processors to implement the thermal power plant feedwater pump auto-parallel method as in any of the above embodiments.
The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the automatic parallel method of the feed pump of the thermal power plant. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically Erasable Programmable Read-Only Memory (EEPROM), erasable Programmable Read-Only Memory (EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), digital Signal Processors (DSP), digital Signal Processing Devices (DSPD), programmable Logic Devices (PLD), field Programmable Gate Arrays (FPGA), controllers, microcontrollers, microprocessors, or other electronic components, and is configured to perform the above-mentioned automatic fuel plant feed pump parallel method and achieve the technical effects consistent with the above-mentioned power plant feed pump parallel method.
In another exemplary embodiment, a computer readable storage medium including program instructions, which when executed by a processor, implement the steps of the automatic parallel method for the feedwater pump of the thermal power plant in any of the above embodiments, is also provided. For example, the computer readable storage medium may be the memory including the program instructions, and the program instructions may be executed by a processor of a computer terminal device to implement the above-mentioned method for automatically paralleling feedwater pumps of a thermal power plant, and achieve the same technical effects as the above-mentioned method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. An automatic paralleling method for feed pumps of a thermal power plant is characterized by comprising the following steps:
respectively acquiring the working rotating speed of a first water supply pump and the working rotating speed of a second water supply pump;
calculating a working rotating speed difference value according to the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump;
if the working speed difference exceeds a threshold value, starting an automatic parallel mode, and locking a water feeding pump condition system of the original unit until a parallel program of the water feeding pumps is completed;
the automatic parallel mode comprises the steps of detecting the water level of a boiler drum, if the water level of the boiler drum is within a safe range value, adjusting the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump until the working rotating speeds are respectively smaller than the threshold value, and stopping the automatic parallel mode;
if the working rotating speed difference value exceeds the threshold value, starting an automatic parallel mode, wherein the automatic parallel mode comprises the following steps:
comparing the working rotating speed of the first water supply pump with the working rotating speed of the second water supply pump;
if the working rotating speed of the first water supply pump is greater than that of the second water supply pump, adjusting a working rotating speed instruction by adopting a preset first adjusting parameter group;
if the working rotating speed of the second water feed pump is greater than that of the first water feed pump, adjusting a working rotating speed instruction by adopting a preset second adjusting parameter group;
the automatic parallel mode includes detecting a boiler drum water level, if the boiler drum water level is within a safe range value, adjusting the working rotating speed of the first water supply pump and the working rotating speed of the second water supply pump until the working rotating speeds are respectively smaller than the threshold value, and terminating the automatic parallel mode, including:
the first adjusting parameter group comprises a first normal water level adjusting parameter, a first low water level adjusting parameter, a first high water level adjusting parameter, a first main feedwater flow and a main steam flow deviation value;
the automatic parallel mode also comprises the step of detecting the difference value between the main water feeding flow and the main steam flow;
if the steam drum water level is within a safe range value and the difference value between the main feedwater flow and the main steam flow is within a normal value, adopting the first normal water level adjustment parameter;
if the steam drum water level exceeds a safety range value and the difference value between the main feedwater flow and the main steam flow is not within a normal value, adopting the first high water level adjustment parameter;
if the water level of the steam drum is lower than a safety range value and the difference value between the main feedwater flow and the main steam flow is not within a normal value, adopting the first low water level adjustment parameter;
the first normal water level adjusting parameter reduces the working rotating speed instruction of the first water supply pump at the rate of 1% per second, and increases the working rotating speed instruction of the second water supply pump at the rate of 1% per second;
the first high water level adjusting parameter is a command for locking and increasing the working rotating speed of the second water supply pump, and the command for reducing the working rotating speed of the first water supply pump at a rate of 1% per second;
the first low water level adjusting parameter is a command for locking and reducing the working rotating speed of the first water supply pump, and the command for increasing the working rotating speed of the second water supply pump at a rate of 1% per second.
2. The method of claim 1, wherein the second set of adjustment parameters includes a second normal water level adjustment parameter, a second low water level adjustment parameter, a second high water level adjustment parameter, a second main feedwater flow and main steam flow deviation value;
if the water level of the steam drum is within a safe range value and the deviation between the main water supply flow and the main steam flow is within a normal value, adopting the second normal water level adjusting parameter;
if the steam drum water level exceeds a safety range value and the deviation between the main feedwater flow and the main steam flow is not within a normal value, adopting the second high water level adjusting parameter;
and if the steam drum water level is lower than the safety range value and the deviation between the main feedwater flow and the main steam flow is within a normal value, adopting the second low water level adjusting parameter.
3. The automatic parallel method for the feed pump of the thermal power plant as recited in claim 2, further comprising,
the second normal water level adjusting parameter is a working rotating speed instruction for reducing the second water supply pump at the rate of 1% per second and increasing the first water supply pump at the rate of 1% per second;
the second high water level adjusting parameter is a command for locking and increasing the working rotating speed of the first water supply pump, and the command for reducing the working rotating speed of the second water supply pump at a rate of 1 percent per second;
and the second low water level adjusting parameter is a command for locking and reducing the working rotating speed of the second water supply pump, and the command for increasing the working rotating speed of the first water supply pump at a rate of 1% per second.
4. A computer terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the thermal power plant feedwater pump auto-parallel method of any of claims 1 to 3.
5. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of automatically paralleling feedwater pumps of a thermal power plant according to any of claims 1 to 3.
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| CN114109858B (en) * | 2021-09-24 | 2023-12-01 | 中国船舶重工集团公司第七一九研究所 | Balanced control method and system for rotational speed of boiler feed pump cluster |
| CN113944616B (en) * | 2021-09-29 | 2023-08-08 | 华能巢湖发电有限责任公司 | Control method of water supply pump of thermal power plant |
| 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 |
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