CN114688005A - Automatic control method for quickly starting standby electric pump - Google Patents
Automatic control method for quickly starting standby electric pump Download PDFInfo
- Publication number
- CN114688005A CN114688005A CN202210160841.3A CN202210160841A CN114688005A CN 114688005 A CN114688005 A CN 114688005A CN 202210160841 A CN202210160841 A CN 202210160841A CN 114688005 A CN114688005 A CN 114688005A
- Authority
- CN
- China
- Prior art keywords
- electric
- pump
- feed pump
- starting
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000003111 delayed effect Effects 0.000 claims abstract description 5
- 230000003213 activating effect Effects 0.000 claims 2
- 230000004913 activation Effects 0.000 claims 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Images
Classifications
-
- 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
- F04B49/02—Stopping, starting, unloading or idling control
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
An automatic control method for rapidly starting a standby electric pump comprises the following steps: the standby function is automatically started when the electric water feed pump is put into use, the spoon pipe instruction value is determined according to the time group load when the electric water feed pump is put into use, the outlet door of the electric water feed pump is opened in an interlocking manner, and the recirculation regulating valve of the electric water feed pump is opened in an overriding manner; logically judging the quick starting condition of the electric feed pump, and if the quick starting condition is not met, prompting an operator to check the quick starting condition of the electric feed pump; after the steam pump fails, the standby electric water feeding pump is automatically started, and in order to ensure that the electric water feeding pump safely and quickly outputs power after being started, starting current needs to be avoided when the motor is started; when the current is reduced to the starting stable operation range of the electric feed pump or the bad quality of a current measuring point is delayed, a forced tracking signal is sent out, a spoon pipe instruction is automatically added to the opening degree of a spoon pipe corresponding to the water feed flow before the steam pump is in fault, and then automatic adjustment is carried out. The invention continuously supplies water to the water-cooled wall of the boiler, ensures the water supply flow required by the operation of the boiler and effectively avoids the non-stop of the unit.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to an automatic control method for quickly starting a standby electric pump.
Background
An electric feed pump and a steam feed pump are generally arranged in a water supply system of a thermal power plant, and the electric feed pump provides a power source for the water supply system at the initial starting stage of a unit under the working condition of low auxiliary steam quantity, so that the water supply quantity of cold-state flushing and hot-state flushing of a boiler is met; when the four-section steam extraction amount is enough to provide power for the steam-driven water-feeding pump, the steam-driven water-feeding pump replaces the electric water-feeding pump to provide a power source for the system, and the plant power consumption rate in a power plant is reduced. At present, the control thought of a power plant is the trip of a steam-driven feed water pump with mechanical faults, and an operator manually starts the electric feed water pump according to needs, so that the electric feed water pump cannot supply water flow for a system in a short time, a unit is not stopped, and great economic loss is brought to the power plant.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an automatic control method for quickly starting a standby electric pump, which is characterized in that the standby electric feed pump is quickly and automatically started and outputs power to the electric feed pump in a short time after the steam feed pump trips due to faults by analyzing the electric pump current and scoop tube instruction data when the electric feed pump is manually started in the starting process of a power plant unit, so that water is continuously supplied to a water-cooled wall of a boiler, the water supply flow required by the operation of the boiler is ensured, and the non-stop of the unit is effectively avoided.
In order to achieve the purpose, the invention adopts the technical scheme that:
an automatic control method for rapidly starting a standby electric pump comprises the following steps:
the method comprises the following steps:
the method comprises the following steps that a standby function is automatically started when the electric water feed pump is put into use, a spoon pipe instruction of the electric water feed pump is set to be a certain value, the spoon pipe instruction value is determined according to the group load when the standby function of the electric water feed pump is put into use, an outlet door of the electric water feed pump is opened in an interlocking mode, and a recirculation regulating valve of the electric water feed pump is opened in an overriding mode;
step two:
after the first step is finished, logically judging the quick starting condition of the electric feed pump, and if the quick starting condition is not met, prompting an operator to check the quick starting condition of the electric feed pump;
step three:
after the steam pump fails, the standby electric water feeding pump is automatically started, and in order to ensure that the electric water feeding pump safely and quickly outputs power after being started, starting current needs to be avoided when the motor is started;
when the current is reduced to the starting stable operation range of the electric feed pump or the bad quality of a current measuring point is delayed for a certain time, a forced tracking signal is sent out, a spoon pipe instruction is automatically added to the opening degree of a spoon pipe corresponding to the water feed flow before the steam pump is in fault, and then automatic adjustment is carried out.
And step one, the standby function of the electric feed pump is put into the operation station picture, after the standby function is put into the operation station picture, a logic pulse block is triggered to generate a recirculation valve regulating command and a spoon pipe command signal, after the signal is triggered, the recirculation valve regulating command of the electric pump is switched to k1, the spoon pipe command is switched to k2, and meanwhile, an electric door at the outlet of the electric feed pump is opened in an interlocking manner.
The specific determination method of the spoon pipe instruction value in the first step is that the lifting speed and the output of the frequency converter are comprehensively considered, the output of the frequency converter is quickly lifted to ensure that the boiler is not cut off, and the optimal electric pump spoon pipe set value is obtained according to the actual condition test of the power plant.
And step two is to prevent the motor-driven water-feeding pump from failing to start due to the fact that the starting condition is not met, after a time delay t1 is achieved after the step one, the starting condition of the motor-driven water-feeding pump is judged logically and automatically, if the starting condition is not met, an operator is prompted on an operation station picture, and if the starting condition is not met, the operator is asked to check.
The logic judgment of the quick starting condition of the electric feed pump is specifically a set spoon pipe instruction, an electric pump recirculation valve instruction and an opened outlet door of the electric feed pump.
After the steam-driven water feed pump fails in the third step, an automatic starting signal of the electric water feed pump is true and is kept for a period of time t2, the current of the electric water feed pump is between a1 and a2 or after the bad quality delay of a current measuring point is t3, a spoon pipe forced tracking signal is generated, an automatic spoon pipe placing instruction is that the water feed flow corresponds to the opening k3 of a spoon pipe before the steam-driven water feed pump trips, the output of the electric water feed pump is adjusted after the instruction is limited in speed, the spoon pipe forced tracking instruction disappears after t4 time, and the spoon pipe is changed to automatically adjust the water feed flow.
The invention has the beneficial effects that:
according to the invention, when the steam-driven water feed pump has a mechanical fault, the standby electric water feed pump can be automatically and quickly started and can quickly output power in a short time, so that the safe and stable operation of the electric water feed pump is ensured, water is continuously supplied to the water-cooled wall of the boiler, the water feed flow required by the water-cooled wall is ensured, meanwhile, the non-stop of the unit caused by the fault of the single steam-driven water feed pump is effectively avoided, and the economic benefit of a power plant is improved.
Drawings
FIG. 1 is a logic diagram of the method of the present invention.
Wherein, 1 is a boiler main control instruction signal, 2 is a steam-driven feed pump fault signal, 3 is a generator power signal, 4 is a spoon pipe instruction signal, 5 is an electric pump standby input signal, 6 is an electric pump automatic starting signal, 7 is an electric pump current signal, 8 is a spoon pipe opening function module corresponding to the boiler main control instruction, 9 is a comparison module, 10 is an electric pump standby input signal duration pulse module, 11 is an electric pump automatic starting signal duration pulse module, 12 is a comparison module, 13 is a comparison module, 14 is a measuring point bad quality judgment module, 15 is a bad quality duration delay time module, 16 is a switching module, 17 is a switching module, 18 is an AND module, 19 is a delay module, 20 is an OR module, 21 is a switching module, 22 is an AND module, 23 is a switching module, 24 is an OR module, 25 is a speed limiting module, 26 is a switching module, 27 is a spoon pipe forced tracking value, 28 is a forced tracking value of a recirculation regulating valve, 29 is a forced tracking signal of a scoop tube, and 30 is a forced tracking signal of related equipment of the electric feed pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Taking a certain supercritical 350MW unit of a ten-weir as an example, a water supply system is provided with 1 50% capacity electric water supply pump and 1 100% capacity steam-driven water supply pump set, the steam-driven water supply pump adjusts the water supply flow of the unit, and the unit stably runs with 200MW load.
Referring to fig. 1 specifically, the method of the present invention is an automatic control method for rapidly starting a backup electric pump, after an instruction is input, an electric pump backup input signal module 5 is input, the signal is set to keep an electric pump backup input signal duration pulse module 10 for 5 seconds, a switching module 21 automatically sets a scoop tube instruction of an electric feed pump to 20%, so that a generator power module 3 is larger than a comparison module 9 by a fixed value of 145MW, a switching module 17 outputs a P1 value of 20%, that is, the scoop tube instruction is 20%, if the generator power module 3 is smaller than or equal to 145MW, the switching module 17 outputs a P2 value of 10%, that is, the scoop tube instruction is 10%, a forced tracking signal 30 of a relevant device of the electric feed pump is set to 1, a recirculation regulating valve of the electric feed pump is opened by an override, the switching module 26 outputs a value of 50% switched from the P2 value to the P1 value of 100%, that is, the forced tracking value 28 of the recirculation regulating valve is set to 100%, the outlet door of the electric water feed pump is opened in an interlocking manner, the electric door of the outlet of the electric water feed pump is opened for delay of 120s to judge the starting permission condition of the electric water feed pump, if any one of the conditions is not met, the electric water feed pump is prompted to run personnel that the quick starting function of the electric water feed pump is blocked, and the system needs to be checked; if the starting conditions are simultaneously met and the steam-driven feed water pump has a fault signal 2 of 1, a signal 6 for automatically starting a standby electric feed water pump is sent out, the holding time of an electric pump automatic starting signal duration pulse module 11 is set to be 10 seconds, the electric feed water pump is quickly started, in order to avoid the starting current when the motor is started, after the electric feed water pump is automatically started, when an electric pump current signal 7 falls back to a value which is higher than the fixed value 50A of a comparison module 13 and lower than the fixed value 250A of the comparison module 12 and is delayed for 1.5 seconds through a delay module 19 or a point fault 14 of a current value 7 is set to be 1 and a delay module 15 is set to be 6 seconds, the input of a liquid couple instruction of the electric feed water pump is overridden and switched to the P1 value of a module 23, when the steam pump fault signal is 1, a switching module 16 is self-locked, the main control boiler instruction signal 1 before the steam pump fault is kept to pass through a value 40% corresponding to a function 8, namely the output value of the switching module 23 is 40%, the switched instruction is subjected to speed limit setting of 5%/second through the speed limit module 25, when the electric pump automatic start signal keeps the pulse module 11 for 10 seconds, the spoon pipe forced tracking signal 29 is 0, the control of the spoon pipe of the electric water feed pump is changed into the automatic control of the water feed flow according to the water feed flow setting, and the quick start of the electric water feed pump is finished.
Claims (6)
1. An automatic control method for rapidly starting a standby electric pump is characterized by comprising the following steps:
the method comprises the following steps:
the method comprises the following steps that a standby function is automatically started when the electric water feed pump is put into use, a spoon pipe instruction of the electric water feed pump is set to be a certain value, the spoon pipe instruction value is determined according to the group load when the standby function of the electric water feed pump is put into use, an outlet door of the electric water feed pump is opened in an interlocking mode, and a recirculation regulating valve of the electric water feed pump is opened in an overriding mode;
step two:
after the first step is finished, logically judging the quick starting condition of the electric feed pump, and if the quick starting condition is not met, prompting an operator to check the quick starting condition of the electric feed pump;
step three:
after the steam pump fails, the standby electric water feeding pump is automatically started, and in order to ensure that the electric water feeding pump safely and quickly outputs power after being started, starting current needs to be avoided when the motor is started;
when the current is reduced to the starting stable operation range of the electric feed pump or the bad quality of a current measuring point is delayed for a certain time, a forced tracking signal is sent out, a spoon pipe instruction is automatically added to the opening degree of a spoon pipe corresponding to the water feed flow before the steam pump is in fault, and then automatic adjustment is carried out.
2. The method as claimed in claim 1, wherein the step of activating the backup electric pump includes activating a logic pulse block after activation of the standby function of the electric feed pump in the operation station screen to generate a command for switching the recirculation valve and a command signal for the scoop tube, and after the activation of the logic pulse block, the command for switching the recirculation valve to k1 and the command for the scoop tube to k2 are activated, and the electric gate at the outlet of the electric feed pump is interlocked and opened.
3. The automatic control method for rapidly starting the electric backup pump according to claim 1, wherein the specific determination method for the scoop tube command value in the first step is to comprehensively consider the lifting speed and the output of the frequency converter, the output of the fast lifting frequency converter ensures that the boiler is not cut off water, and the optimal electric pump scoop tube set value is obtained according to the actual condition test of the power plant.
4. The automatic control method for rapidly starting the electric backup pump as claimed in claim 1, wherein said second step is to prevent the electric feed pump from failing to start due to the fact that the starting condition is not satisfied, said first step is executed and then delayed for t1, the logic automatically judges the starting condition of the electric feed pump, if not, the operator is prompted on the operation station screen, if the starting permission condition is not satisfied, the operator is asked to check.
5. The method according to claim 4, wherein said logic determines that the electric feed pump quick start condition is a set scoop tube command, an electric pump recirculation valve command, and an electric feed pump outlet door is open.
6. The automatic control method for rapidly starting the electric backup pump as claimed in claim 1, wherein after the steam-driven feed pump fails in the third step, the automatic start signal of the electric feed pump is true and maintained for a period of time t2, the current of the electric feed pump is between a1 and a2 or after the bad quality delay t3 of a current measuring point, a spoon pipe forced tracking signal is generated, the automatic spoon pipe setting instruction is that the feed water flow rate before the steam-driven feed pump trips corresponds to a spoon pipe opening k3, the electric feed pump is adjusted after the instruction is limited in speed, the spoon pipe forced tracking instruction disappears after the time t4, and the spoon pipe is switched to automatically adjust the feed water flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210160841.3A CN114688005A (en) | 2022-02-22 | 2022-02-22 | Automatic control method for quickly starting standby electric pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210160841.3A CN114688005A (en) | 2022-02-22 | 2022-02-22 | Automatic control method for quickly starting standby electric pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114688005A true CN114688005A (en) | 2022-07-01 |
Family
ID=82136866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210160841.3A Pending CN114688005A (en) | 2022-02-22 | 2022-02-22 | Automatic control method for quickly starting standby electric pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114688005A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008035A (en) * | 2007-06-29 | 2009-01-15 | Ebara Corp | Variable speed water supply device |
| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| US20140205048A1 (en) * | 2013-01-23 | 2014-07-24 | General Electric Company | Systems and Methods for Providing Override Control for a Feedwater Pump Recirculation Valve |
| 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 |
| CN108561300A (en) * | 2018-03-29 | 2018-09-21 | 中国神华能源股份有限公司 | Feed pump operation method and system |
| CN112879890A (en) * | 2021-02-22 | 2021-06-01 | 西安热工研究院有限公司 | Automatic starting control method for whole process of coal-fired unit based on electric water feeding pump |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113530625A (en) * | 2021-07-20 | 2021-10-22 | 西安热工研究院有限公司 | Method for rapidly reducing load after single steam pump failure of supercritical (super) critical unit configuration |
-
2022
- 2022-02-22 CN CN202210160841.3A patent/CN114688005A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008035A (en) * | 2007-06-29 | 2009-01-15 | Ebara Corp | Variable speed water supply device |
| US20140205048A1 (en) * | 2013-01-23 | 2014-07-24 | General Electric Company | Systems and Methods for Providing Override Control for a Feedwater Pump Recirculation Valve |
| CN103791485A (en) * | 2014-02-28 | 2014-05-14 | 国家电网公司 | Optimal control method of water supply system of thermal power generating unit |
| 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 |
| CN108561300A (en) * | 2018-03-29 | 2018-09-21 | 中国神华能源股份有限公司 | Feed pump operation method and system |
| CN112879890A (en) * | 2021-02-22 | 2021-06-01 | 西安热工研究院有限公司 | Automatic starting control method for whole process of coal-fired unit based on electric water feeding pump |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113530625A (en) * | 2021-07-20 | 2021-10-22 | 西安热工研究院有限公司 | Method for rapidly reducing load after single steam pump failure of supercritical (super) critical unit configuration |
Non-Patent Citations (1)
| Title |
|---|
| 宋继业;薛大禹;董志乾;: "330MW循环流化床锅炉电动给水泵抢水逻辑分析及优化", 工业控制计算机, no. 06 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107939458B (en) | Nuclear power control system and nuclear power control method | |
| CN107165686B (en) | Secondary reheating thermal power generating unit bypass control method and system | |
| CN108597632B (en) | Grid-connected load regulation control method and system for nuclear power unit | |
| CN112540537B (en) | Unit RB target load self-adaptive generation method based on auxiliary machine state | |
| CN112467175A (en) | Hydrogen fuel cell control system and method | |
| CN114688005A (en) | Automatic control method for quickly starting standby electric pump | |
| CN113530625A (en) | Method for rapidly reducing load after single steam pump failure of supercritical (super) critical unit configuration | |
| CN117438119A (en) | High-temperature gas cooled reactor transition reactor core machine pile interlocking control method and system | |
| CN113405088A (en) | Three-impulse frequency conversion automatic adjusting method | |
| CN113605997B (en) | Control method for single-loop double-regulation object of turbine bypass system | |
| CN112486227A (en) | Control system and method for automatic control of pressure of cooling water system | |
| KR101323688B1 (en) | Power generator using blast furnace top gas pressure and controlling method thereof | |
| CN107707175A (en) | A kind of dead electricity of electric drive compressor crosses over control system and method | |
| CN114752721B (en) | Single-seat blast furnace fan supply protection system and control method thereof | |
| CN113685800A (en) | Automatic pump combination control system of steam feed pump based on speed self-adaption | |
| CN103439950B (en) | A kind of automatic start-stop detection method and system being applied to water system | |
| CN108105024B (en) | SFC starting control method | |
| CN109488394A (en) | The control method that million nuclear steam turbine control system machine heaps are coordinated | |
| CN220381492U (en) | Control system of variable-rate pump recirculation regulating valve with unidirectional locking function | |
| CN110096076B (en) | Boron supply control circuit, equipment and method for million-kilowatt nuclear power station | |
| CN211598914U (en) | Hydropower station unit technical water supply control system with water level control function | |
| CN114251646B (en) | Steam generator liquid level control method suitable for start-stop working condition of main pump | |
| CN219916220U (en) | Water valve control circuit of main transformer cooler | |
| CN114688520B (en) | Auxiliary control method and system for liquid level of steam generator of nuclear power station | |
| CN215762597U (en) | Control device for speed regulator hydraulic system of giant hydroelectric generating set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |