CN113531513B - Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump - Google Patents
Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump Download PDFInfo
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- CN113531513B CN113531513B CN202110857602.9A CN202110857602A CN113531513B CN 113531513 B CN113531513 B CN 113531513B CN 202110857602 A CN202110857602 A CN 202110857602A CN 113531513 B CN113531513 B CN 113531513B
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- valve
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- feed pump
- water level
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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
Abstract
A protection method of a drum water level control system when a steam feed pump enters a steam valve to be in fault relates to the technical field of steam pump control of a thermal power plant. The invention aims to solve the problem that the valve is completely closed when the valve inlet valve is opened due to loosening and falling of a valve return rod of a valve control gate LVDT or loosening of a command plug of a MOGE valve. The invention firstly judges whether the steam inlet valve of the steam feed pump of the steam drum water level control system fails, if so, the double-path LVDT position return rod is regulated to the maximum value, then the deviation between the maximum value in the double-path LVDT position return rod and the control instruction of the steam inlet valve is sent to the MOGE valve, the opening of the steam inlet valve is controlled, the steam inlet valve is fully closed, the steam feed pump trips, and the standby electric pump is started after 3 seconds of delay in an interlocking way. Otherwise, the deviation between the maximum value in the double-path LVDT position return rod and the control command of the admission valve is directly sent to the MOGE valve to control the opening of the admission valve.
Description
Technical Field
The invention belongs to the technical field of control of a steam pump of a thermal power plant, and particularly relates to control of a steam inlet valve of a steam feed pump.
Background
The rated power of the existing generating set in I, II period of power plant is 330MW, a steam drum water level control system adopts a 100% steam feed pump, and two standby 50% electric pumps are used as boiler water supply. When the steam pump is in normal operation, five sections of steam extraction of the steam turbine provide a steam source, and the water level is controlled by controlling the opening of the regulating valve.
However, once the position feedback rod of the valve LVDT (differential pressure displacement sensor) is loosened and falls off, or the plug is instructed to be loosened by the MOGE valve (external control one-way sequence valve), the valve is fully closed, so that the valve is disconnected, the water level of the drum is not controlled, and unsafe events are caused.
Disclosure of Invention
The invention aims to solve the problem that the valve inlet of a steam pump is completely closed and disconnected due to loosening of a valve return rod of a valve LVDT or loosening of a command plug of a MOGE valve, and provides a protection method of the steam drum water level control system when the valve inlet of a steam feed pump fails.
The protection method of the drum water level control system when the steam feed pump enters the steam valve and fails comprises the following steps:
step one: judging whether the steam inlet valve of the steam feed pump of the steam drum water level control system fails, if so, executing the second step, otherwise, executing the third step,
step two: the double-path LVDT position return rod is adjusted to the maximum value, then the step three is executed to ensure that the steam inlet regulating valve is fully closed, the steam feed pump trips, and the standby electric pump is started in an interlocking way after the delay time is 3s,
step three: and sending the deviation between the maximum value in the double-path LVDT position return rod and the control instruction of the admission valve to the MOGE valve to control the opening degree of the admission valve.
In the third step, the deviation is amplified by a power amplifier and then sent to a MOGE valve.
Further, in the first step, the method for judging whether the steam inlet valve of the steam feed pump of the steam drum water level control system fails is as follows: judging whether the instruction deviation ratio is more than 10%, if so, generating a fault, otherwise, generating no fault.
Further, the command deviation ratio is:
the ratio of the absolute value of the deviation of the maximum value of the LVDT return rod and the admission control command in the maximum value of the LVDT return rod.
Further, the fault types of the steam inlet valve of the steam feed pump of the steam drum water level control system comprise:
LVDT bit return rod loosens, drops, and MOGE valve command plug loosens.
The protection method of the drum water level control system in case of the steam feed pump inlet valve failure has the following effects:
1) When the water supply system is disconnected due to the complete closing of the steam inlet valve, the steam feed pump is connected with the standby electric pump to prevent the water level protection action of the steam drum.
2) The labor intensity of operators is reduced, and the operation safety of the drum water level control system is ensured.
3) The standby electric pump can be started in time when the LVDT return rod is loosened and falls off or the MOGE valve instructs the plug to be loosened, and the water level of the steam drum is maintained in a normal range.
Drawings
FIG. 1 is a schematic diagram of a steam feed pump in the event of no failure of a steam inlet valve;
fig. 2 is a schematic diagram of the principle of the steam feed pump when the steam inlet valve fails.
Detailed Description
The first embodiment is as follows: referring to fig. 1 to 2, a protection method for a drum water level control system in case of a failure of a steam inlet valve of a steam feed pump according to the present embodiment is specifically described, including the following steps:
step one: judging whether the ratio of the maximum value of the LVDT position return rod to the absolute value of the deviation of the control command of the inlet valve in the maximum value of the LVDT position return rod is more than 10%, if so, executing the second step, otherwise, executing the third step, wherein the inlet valve of the steam feed pump of the steam drum water level control system fails.
Step two: and (3) adjusting the double-path LVDT position return rod to the maximum value, and then executing the third step to enable the steam inlet regulating valve to be fully closed, trip the steam feed pump, and start the standby electric pump in an interlocking way after delay for 3 seconds.
Step three: and amplifying the deviation between the maximum value in the double-path LVDT position return rod and the control instruction of the admission valve through a power amplifier, and then sending the amplified deviation into the MOGE valve to control the opening degree of the admission valve.
The steam feed pump inlet valve fault type of the steam drum water level control system comprises: LVDT bit return rod loosens, drops, and MOGE valve command plug loosens.
In this embodiment, after two kinds of faults occur, the standby electric pump can be started in an interlocking manner, so as to ensure that the drum water level is controlled within a normal range, and thus ensure safe and stable operation of the drum water level control system. The present embodiment proposes two ways of detecting faults, namely: judging whether the instruction deviation ratio is more than 10% or not, and providing two treatment measures after faults, and automatically treating the faults immediately after the faults occur so as to avoid accident deterioration.
Claims (5)
1. The protection method of the drum water level control system when the steam feed pump enters the steam valve and fails is characterized by comprising the following steps:
step one: judging whether the steam inlet valve of the steam feed pump of the steam drum water level control system fails, if so, executing the second step, otherwise, executing the third step,
step two: the double-path LVDT position return rod is adjusted to the maximum value, then the step three is executed to ensure that the steam inlet regulating valve is fully closed, the steam feed pump trips, and the standby electric pump is started in an interlocking way after the delay time is 3s,
step three: and sending the deviation between the maximum value in the double-path LVDT position return rod and the control instruction of the admission valve to the MOGE valve to control the opening degree of the admission valve.
2. The method of claim 1, wherein in step three, the deviation is amplified by a power amplifier and then fed into a MOGE valve.
3. The method for protecting a drum water level control system in the event of a failure of a steam feed pump inlet valve according to claim 1, wherein in the first step, the method for judging whether the steam feed pump inlet valve of the drum water level control system fails is as follows:
judging whether the instruction deviation ratio is more than 10%, if so, generating a fault, otherwise, generating no fault.
4. A method of protecting a drum water level control system in the event of a failure of a steam feed pump inlet valve as set forth in claim 3, wherein said command deviation ratio is:
the ratio of the absolute value of the deviation of the maximum value of the LVDT return rod and the admission control command in the maximum value of the LVDT return rod.
5. A method of protecting a drum water level control system in the event of a failure of a steam feed pump inlet valve as set forth in claim 3, wherein the type of steam feed pump inlet valve failure of the drum water level control system comprises:
LVDT bit return rod loosens, drops, and MOGE valve command plug loosens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110857602.9A CN113531513B (en) | 2021-07-28 | 2021-07-28 | Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110857602.9A CN113531513B (en) | 2021-07-28 | 2021-07-28 | Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump |
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| CN113531513A CN113531513A (en) | 2021-10-22 |
| CN113531513B true CN113531513B (en) | 2023-05-02 |
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| CN114575941B (en) * | 2022-03-14 | 2023-09-12 | 哈尔滨沃华智能电力技术有限公司 | RBP2 card-based door adjusting control system and method |
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Address after: 150000 No. 406, 4th floor, science and Technology Park building, Harbin University of technology, No. 434, youyou street, Nangang District, Harbin City, Heilongjiang Province Applicant after: Harbin wohua Intelligent Power Technology Co.,Ltd. Applicant after: INNER MONGOLIA MENGDA POWER GENERATION CO.,LTD. Address before: 150000 Room 606, science and Technology Park building, Harbin University of technology, No. 434, postal street, Nangang District, Harbin City, Heilongjiang Province Applicant before: HARBIN WOHUA INTELLIGENT POWER GENERATION EQUIPMENT CO.,LTD. Applicant before: INNER MONGOLIA MENGDA POWER GENERATION CO.,LTD. |
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