CN108591041B - Minimum flow recirculation valve control system and method for feed pump - Google Patents
Minimum flow recirculation valve control system and method for feed pump Download PDFInfo
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- CN108591041B CN108591041B CN201810739007.3A CN201810739007A CN108591041B CN 108591041 B CN108591041 B CN 108591041B CN 201810739007 A CN201810739007 A CN 201810739007A CN 108591041 B CN108591041 B CN 108591041B
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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
- F04B49/225—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 with throttling valves or valves varying the pump inlet opening or the outlet opening
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The control system and the method are used for driving an adjusting device of the water feed pump to adjust the power of driving equipment of the water feed pump, and the water feed pump with variable rotation speed is driven by a rotating shaft to realize the control of water feed flow by changing the rotation speed; the variable-speed water supply pump sucks working media from the upstream, pumps the working media to a downstream system for use through the variable-speed water supply, an inlet pressure signal measured by an inlet pressure sensor is sent to a saturation temperature module for calculating saturation temperature corresponding to inlet pressure according to physical properties of water and steam, the saturation temperature output by the saturation temperature module and an outlet temperature signal output by an outlet temperature sensor are simultaneously sent to a minimum flow protection recirculation controller, the outlet temperature output by the outlet temperature sensor is controlled to be lower than the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module, when the deviation of the two is lower than a preset value, a minimum flow recirculation valve of the water supply pump is opened, and a part of the water working media is sent back to an upstream pipeline of the variable-speed water supply pump from an outlet pipeline of the variable-speed water supply pump.
Description
Technical Field
The invention relates to the field of automatic control of thermal power plants, in particular to a system and a method for controlling a minimum flow recirculation valve of a feed pump.
Background
The minimum flow valve can ensure the minimum flow of the water supply pump, and when the outlet flow of the water supply pump is smaller than the minimum flow, the minimum flow valve is automatically opened to reflux a part of water supply to the deaerator, so that the water supply pump is prevented from working in an environment lower than the minimum flow. The control of the minimum flow valve is related to the safe operation of the feed pump, but the conventional control logic design only considers the start-stop condition of short-term operation. With the deep transformation of industrial structures in China and the high-speed development of new energy power generation, thermal power generating units face the strong demands of improving the operation flexibility and deep peak shaving. When the peak is deeply regulated, the running working condition of the unit deviates from the rated working condition more, the flow of the water feeding pump is lower, and the minimum flow protection action is required frequently. Under the new deep peak shaving operation requirement, a series of problems such as severe fluctuation of low-load water supply, severe abrasion of a minimum flow valve and the like often occur:
(1) The uncertainty of flow measurement of minimum flow protection of water supply pump is high, and fluctuation is large
The measuring point of the outlet flow of the water supply pump is not high in measuring precision and the measuring deviation is obviously amplified along with the reduction of the load and the water supply flow, so that the fluctuation of signal data is more obvious, but the signal measurement of the current minimum flow protection control loop is not subjected to the correction of low load under deep peak regulation and is not subjected to necessary filtering, so that the great jitter of a regulating valve is easily caused, the oscillation of water supply control is caused, and even the safety of the pump is threatened due to the amplification of the measuring error under the low load.
(2) Common minimum flow valve control strategy is not suitable for deep peak regulation working condition operation
The minimum flow protection logic of the common feed pump adopts a most conventional PID control mode, and the control target fixed value is 230t/h, which means that when the outlet flow of the feed pump is smaller than 230, the gate is opened to greatly increase the flow to 230t/h, and when the outlet flow is higher than 230t/h, the gate is closed, and the pump is required to work at the minimum flow all the time under low load. Because the control target of the pump is the drum water level, the switch of the minimum flow valve can influence the control of the pump, thereby causing the fluctuation of the flow of the pump, the PID control of the fixed value target is extremely easy to generate the coupling oscillation with the water supply system when the minimum flow valve is switched on and off, and because the PID control has a certain control overshoot, the pump is extremely easy to work under the working condition of less than the minimum flow in the process of controlling the fluctuation, and the safety of the pump is adversely affected.
(3) Minimum flow protection fixed value no-load variable speed pump operation rule
The minimum flow protection of the water supply pump is to avoid cavitation at a small flow rate of the pump and threaten the safety of the pump, so that the minimum flow protection fixed value is related to the rotating speed of the variable-speed pump, and the protection fixed value is reduced along with the reduction of the rotating speed of the pump. The minimum flow protection constant of the water supply pump in the prior art is set as a constant according to the characteristic of the pump at the rated rotation speed, the rotation speed of the pump is reduced more during the deep peak regulation operation, and the protection constant is also required to be reduced along with the rotation speed in theory, for example, the water supply pump is controlled according to the protection constant, thus the water supply pump can cause recirculation to operate in a long-term opening state, and the valve scouring loss is caused, and meanwhile, the long-term operation economic loss is also caused.
Disclosure of Invention
In view of the problems in the prior art, the invention provides the control system and the control method for the minimum flow recirculation valve of the water supply pump, which can avoid the switching action of the minimum flow valve under most working conditions during low-load operation, and have the advantages of better stability and obvious energy-saving effect.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the minimum flow recirculation valve control system of the feed pump comprises a regulating device 1 for driving the feed pump, a driving device 2 of the feed pump connected with the regulating device 1, a variable-rotation-speed feed pump 4 connected with the driving device 2 of the feed pump through a rotating shaft 3, an inlet pressure sensor 5 arranged at the inlet of the variable-rotation-speed feed pump 4, an outlet temperature sensor 6 arranged at the outlet of the variable-rotation-speed feed pump 4, a saturation temperature module 7 connected with the inlet pressure sensor 5 and used for calculating the saturation temperature corresponding to the inlet pressure according to the physical properties of water and steam, a minimum flow protection recirculation controller 8 connected with the outlet temperature sensor 6, the saturation temperature module 7 is connected with the minimum flow protection recirculation controller 8 and used for sending the saturation temperature into the minimum flow protection recirculation controller 8, and the minimum flow protection recirculation controller 8 is used for comparing the outlet temperature output by the outlet temperature sensor 6 with the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module 7; the system also comprises a minimum flow recirculation valve 9 of the water supply pump, which is connected with the minimum flow protection recirculation controller 8 and an outlet pipeline of the variable-speed water supply pump 4, wherein when the saturation temperature deviation of the outlet temperature output by the outlet temperature sensor 6 and the pump inlet pressure output by the saturation temperature module 7 is lower than a preset value, the minimum flow protection recirculation controller 8 opens the minimum flow recirculation valve 9 of the water supply pump to send a part of water working medium from the outlet pipeline of the variable-speed water supply pump 4 back to the upstream pipeline of the variable-speed water supply pump 4.
The minimum flow recirculation valve control system of the water feed pump adopts the measurement of pressure and outlet temperature signals at the inlet of the variable-rotation-speed water feed pump 4 as the basis, and controls the opening of the minimum flow valve by comparing the deviation of the outlet temperature and the inlet pressure corresponding to the saturation temperature of the variable-rotation-speed water feed pump 4 based on the minimum flow protection principle of the variable-rotation-speed water feed pump 4; the minimum flow protection recirculation controller 8 can adopt a mature conventional PID controller, and utilizes the proportional, integral and differential actions to always ensure that the deviation of the saturation temperature corresponding to the outlet temperature and the inlet pressure of the variable-rotation-speed water supply pump 4 is smaller than the preset protection margin and control error.
According to the control system for the minimum flow recirculation valve of the water feed pump, the minimum flow absolute value limit is not set, the working principle of the variable-rotation-speed water feed pump 4 is utilized, the deviation of the saturation temperature corresponding to the outlet temperature and the inlet pressure of the variable-rotation-speed water feed pump 4 is compared, cavitation risks caused by working or mixing high-temperature sealing water of the variable-rotation-speed water feed pump 4 can be avoided under the variable-rotation-speed condition, the rotation speed change of the variable-rotation-speed water feed pump 4 is automatically adapted, the minimum flow recirculation valve 9 does not need to be opened earlier when the load is reduced, and therefore damage to the stability of the water feed system and the service life of the minimum flow recirculation valve 9 during deep peak regulation of a unit is greatly relieved.
The control method of the minimum flow recirculation valve control system of the water feed pump is used for driving the adjusting device 1 of the water feed pump to adjust the power of the driving equipment 2 of the water feed pump, driving the water feed pump 4 with variable rotation speed through the rotating shaft 3, and realizing the control of the water feed flow through changing the rotation speed; the variable-rotation-speed water supply pump 4 sucks working medium from the upstream, the working medium is sent to a downstream system for use through the variable-rotation-speed water supply pump 4, an inlet pressure signal measured by an inlet pressure sensor 5 is sent to a saturation temperature module 7 for calculating a saturation temperature corresponding to the inlet pressure according to physical properties of water and water vapor, the saturation temperature output by the saturation temperature module 7 and an outlet temperature signal output by an outlet temperature sensor 6 are simultaneously sent to a minimum flow protection recirculation controller 8, the outlet temperature output by the outlet temperature sensor 6 is controlled to be lower than the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module 7, when the deviation of the two is lower than a preset value, the minimum flow protection recirculation controller 8 opens a minimum flow recirculation valve 9 of the water supply pump, a part of the water working medium is sent back to the upstream pipeline of the variable-rotation-speed water supply pump 4 from an outlet pipeline of the variable-speed water supply pump 4, the water supply flow is reduced, the unit can automatically start the regulating device 1 to further improve the rotation speed of the variable-rotation-speed pump 4 and the pumped flow, the working flow of the variable-rotation-speed pump 4 is increased, the efficiency is increased, the working point is further away from the working flow of the variable-speed pump is further, and the necessary bypass is prevented from causing unnecessary loss due to cavitation.
Compared with the prior art, the invention has the following advantages:
1. the protection of the minimum flow of the water supply pump starts from the basic principle of pump cavitation, the minimum flow fixed value of the rated working condition is not adopted for protection control, steam-water parameters are directly adopted, the working flow of the pump is ensured to be at a safe level from the source, compared with the current main flow fixed value protection, the protection device is more suitable for the new situation of the thermal power generating unit in the current deep peak regulation operation, the switching action of the minimum flow valve of most working conditions can be avoided during the low-load operation, the stability is better, and the energy-saving effect is obvious.
2. The cavitation allowance calculation required by the pump in the design stage and the cavitation analysis calculation of the related main flow method are only related to the pressure temperature parameter of the pump inlet, but the position where cavitation occurs first is generally in the working area of the pump impeller, during the rotation of the impeller of the pump, local low pressure can be formed on the suction surface of the impeller due to mechanical movement, meanwhile, the temperature of the fluid working medium can be raised, the local temperature is easy to be lower than the saturation temperature corresponding to the local low pressure, and the local temperature is easy to be higher than the saturation temperature corresponding to the local pressure, so that flash evaporation occurs, and cavitation damage is caused. According to the analysis, a certain deviation exists between the local low pressure and the high temperature and the pump inlet parameter, and a larger safety margin is needed for judging according to the inlet parameter. The invention adopts the inlet pressure measuring point and the outlet temperature measuring point as the protection reference, and the outlet temperature is improved due to the enthalpy rise of the pump, so that the protection is safer than the inlet parameter; on the other hand, when the flow and the rotating speed are reduced, the protection condition correspondingly changes in an adaptability way, in comparison with the prior art, the inlet parameter is adopted for judging that the cavitation allowance corresponding to the rated working condition is generally only used for protection, but the low-load low-flow working condition often lacks the data of the variable working condition, so that the minimum flow recirculation valve is started too early in the load reduction process, unnecessary recirculation economic loss is caused, the water supply control of a machine set is seriously disturbed in the switching process, and a series of hidden troubles of safety and valve life are brought.
3. For a feed pump employing a liquid seal, the low flow and low rotational speed conditions tend to cause mixing of the seal water into the feed water, further exacerbating the risk of cavitation, where such temperature rise may be further reflected by an increase in the feed pump outlet temperature, thereby compensating for the minimum flow protection risk that results therefrom. Therefore, the system of the present invention can still effectively function for a liquid-tight feed pump, and conventional cavitation judgment structures and methods are not applicable.
Drawings
FIG. 1 is a diagram of a minimum flow recirculation control system for a feedwater pump of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
The technical principle of the invention is as follows:
the minimum flow rate of a centrifugal pump is typically measured and provided by a pump plant, typically by the allowable cavitation margin expressed in terms of hydraulic head, as a design criterion to avoid as much as possible that the pump is operating in cavitation conditions during design, and a minimum flow rate recirculation system is designed to increase the flow rate through the pump when the process system flow rate is below a certain level, enabling the pump to avoid cavitation damage.
According to the principle of a centrifugal pump, when the pump operates under a small flow, working conditions deviate more from the most economical working conditions, the efficiency is obviously reduced, the input work of the pump is more converted into heat energy of working media rather than kinetic energy, at the moment, the temperature rise is easily generated due to the movement of an impeller of the pump and the action of the impeller on the working media, and the local temperature is higher than the saturation temperature corresponding to the local pressure, so that the working media are subjected to flash evaporation and cavitation, and the damage of the pump is caused. When the liquid temperature reaches a level at which the effective cavitation margin of the system is equal to the necessary cavitation margin of the pump, which is the protective temperature at which cavitation does not occur, the pump needs to maintain a flow rate above that point, which is a general method of determining the minimum continuous heat flow rate of the pump.
However, the energy-saving effect is remarkable, and the high-power thermal power generating units at present all adopt variable-speed water supply pumps driven by steam turbines or variable-frequency motors. The effective cavitation allowance and the minimum protection flow rate of the variable speed pump are reduced along with the reduction of the rotating speed and are far smaller than the protection fixed value corresponding to the rated rotating speed, but most high-power thermal power generating units currently commonly adopt the minimum flow rate value determined by the method according to the rated parameters for protection control, which directly leads to the premature opening of the minimum flow recirculation valve under low load, thus not only causing unnecessary economic loss, but also the opening of the minimum flow recirculation valve directly influencing the stability of water supply control and easily causing frequent switching and oscillation. In the context of depth peaking, the above problems may cause stability problems during depth peaking and thus non-stop risks.
The invention provides a control system for a minimum flow recirculation valve of a feed pump, which is shown in figure 1. The adjusting device 1 for driving the water feed pump is used for adjusting the power of the driving equipment 2 of the water feed pump, the rotating shaft 3 is used for driving the variable-rotating-speed water feed pump 4, and the control of the water feed flow is realized by changing the rotating speed. The variable-rotation-speed water feed pump 4 sucks working medium from the upstream, an inlet pressure sensor 5 is arranged near the inlet of the pump, and the working medium is fed to a downstream system for use through the variable-rotation-speed water feed pump 4, wherein an outlet temperature sensor 6 is arranged near the outlet of the pump. The inlet pressure signal measured by the inlet pressure sensor 5 is sent to the saturation temperature module 7, and is used for calculating the saturation temperature corresponding to the inlet pressure according to the physical properties of water and steam, the saturation temperature output by the saturation temperature module 7 and the outlet temperature signal output by the outlet temperature sensor 6 are simultaneously sent to the minimum flow protection recirculation controller 8, the outlet temperature output by the outlet temperature sensor 6 is controlled to be lower than the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module 7, when the deviation of the two is lower than a certain value (such as 0), the minimum flow protection recirculation controller 8 opens the minimum flow recirculation valve 9 of the water supply pump, a part of water working medium is sent to the upstream pipeline of the variable speed water supply pump 4 from the outlet pipeline of the variable speed water supply pump 4, the water supply flow is reduced, the unit can automatically turn on the regulating device 1 to further improve the rotation speed and the pumped flow of the variable speed water supply pump 4, thus the working flow of the variable speed water supply pump 4 is increased, the efficiency is increased, the working point is further away from the cavitation risk, the self-adaptive rotation speed change realizes the protection of the pump, and economic loss caused by unnecessary bypass flow is avoided.
Examples:
as shown in fig. 1, when the unit is in deep peak-shaving operation, the water supply flow required by the unit is greatly reduced, the adjusting device 1 automatically adjusts and reduces the power of the driving equipment 2 of the water supply pump, and then the rotating speed of the variable-rotating-speed water supply pump 4 is reduced through the rotating shaft 3, so that the water supply flow is greatly reduced. At this time, the operating point of the variable-rotation-speed feed pump 4 is significantly deviated from the optimal rated condition, so that the efficiency is greatly reduced, more mechanical power is directly converted into the internal energy of feed water, the feed water temperature at the outlet of the variable-rotation-speed feed pump 4 is increased, and meanwhile, the sealing water of the high-temperature feed pump is mixed, so that the feed water temperature is further increased, and the pump is at risk of potential cavitation. At this time, the temperature signal measured by the outlet temperature sensor 6 installed at the outlet of the variable-rotation-speed water feed pump 4 is sent to the minimum flow protection recirculation controller 8, so as to perform deviation control corresponding to the saturation temperature of the inlet pressure calculated by the saturation temperature module 7, and when the deviation is smaller than a given fixed value (e.g. 0), the minimum flow recirculation valve 9 of the water feed pump is opened, so that a part of the flow at the outlet of the variable-rotation-speed water feed pump 4 is sent back to the upstream of the inlet of the pump, the water feed flow is reduced, the unit automatically turns on the regulating device 1 so as to further increase the rotation speed of the variable-rotation-speed water feed pump 4 and the pumped flow to maintain the required final water feed flow, thus the working flow of the pump is increased, the efficiency is increased, and the working point is further away from the cavitation risk, so that the self-adaptive rotation speed change realizes the protection of the pump.
Claims (4)
1. A feed pump minimum flow recirculation valve control system, characterized by: the device comprises an adjusting device (1) for driving a water feed pump, driving equipment (2) of the water feed pump, which is connected with the adjusting device (1), a variable-rotation-speed water feed pump (4) which is connected with the driving equipment (2) of the water feed pump through a rotating shaft (3), an inlet pressure sensor (5) which is arranged at the inlet of the variable-rotation-speed water feed pump (4), an outlet temperature sensor (6) which is arranged at the outlet of the variable-rotation-speed water feed pump (4), a saturation temperature module (7) which is connected with the inlet pressure sensor (5) and is used for calculating the saturation temperature corresponding to the inlet pressure according to the physical properties of water and steam, a minimum flow protection recirculation controller (8) which is connected with the outlet temperature sensor (6), wherein the saturation temperature module (7) is connected with the minimum flow protection recirculation controller (8) and is used for feeding the saturation temperature into the minimum flow protection recirculation controller (8), and the minimum flow protection recirculation controller (8) is used for comparing the outlet temperature output by the outlet temperature sensor (6) with the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module (7); the water supply system further comprises a water supply pump minimum flow recirculation valve (9) connected with the minimum flow protection recirculation controller (8) and an outlet pipeline of the variable-rotation-speed water supply pump (4), and when the saturation temperature deviation of the outlet temperature output by the outlet temperature sensor (6) and the pump inlet pressure output by the saturation temperature module (7) is lower than a preset value, the minimum flow protection recirculation controller (8) opens the water supply pump minimum flow recirculation valve (9) to send a part of water working medium back to an upstream pipeline of the variable-rotation-speed water supply pump (4) from an outlet pipeline of the variable-rotation-speed water supply pump (4).
2. The feedwater pump minimum flow recirculation valve control system of claim 1, wherein: the control of the opening of the minimum flow valve is realized by comparing the deviation of the saturation temperature corresponding to the outlet temperature and the inlet pressure of the variable-rotation-speed water feed pump (4) based on the measurement of the pressure at the inlet and the outlet temperature signals of the variable-rotation-speed water feed pump (4) and based on the minimum flow protection principle of the variable-rotation-speed water feed pump (4); the minimum flow protection recirculation controller (8) utilizes the proportional, integral and differential actions to always ensure that the deviation of the saturation temperature corresponding to the outlet temperature and the inlet pressure of the variable-rotation-speed water supply pump (4) is smaller than the preset protection margin and control error.
3. The feedwater pump minimum flow recirculation valve control system of claim 1, wherein: the minimum flow absolute value limit is not set, the working principle of the variable rotation speed water feed pump (4) is utilized, the deviation of the saturation temperature corresponding to the outlet temperature and the inlet pressure of the variable rotation speed water feed pump (4) is compared, the cavitation risk caused by acting or mixing high-temperature sealing water of the variable rotation speed water feed pump (4) is avoided under the variable rotation speed condition, the rotation speed change of the variable rotation speed water feed pump (4) is automatically adapted, the minimum flow recirculation valve (9) is not required to be opened prematurely when the load is reduced, and therefore the damage to the stability of a water feed system and the service life of the minimum flow recirculation valve (9) during the deep peak regulation of a unit is relieved.
4. A control method of a feed pump minimum flow recirculation valve control system according to any one of claims 1 to 3, characterized by: the adjusting device (1) for driving the water feed pump is used for adjusting the power of the driving equipment (2) of the water feed pump, the rotating shaft (3) is used for driving the variable-rotating-speed water feed pump (4), and the control of the water feed flow is realized by changing the rotating speed; the variable-rotation-speed water feed pump (4) sucks working media from the upstream, the working media are fed to a downstream system for use through the variable-rotation-speed water feed pump (4), an inlet pressure signal measured by an inlet pressure sensor (5) is fed into a saturation temperature module (7) for calculating the saturation temperature corresponding to the inlet pressure according to physical properties of water and vapor, the saturation temperature output by the saturation temperature module (7) and an outlet temperature signal output by an outlet temperature sensor (6) are simultaneously fed into a minimum flow protection recirculation controller (8), the outlet temperature output by the outlet temperature sensor (6) is controlled to be lower than the saturation temperature corresponding to the pump inlet pressure output by the saturation temperature module (7), when the deviation of the minimum flow protection recirculation controller and the inlet pressure signal is lower than a preset value, the minimum flow protection recirculation valve (9) of the water feed pump is started, a part of the water working media is fed back to the upstream pipeline of the variable-rotation-speed water feed pump (4) from an outlet pipeline of the variable-speed water feed pump (4), the water feed flow is reduced, a unit can automatically open a regulating device (1) to further improve the rotation speed of the variable-rotation-speed water feed pump (4) and the flow of the pump, the variable-rotation-speed water feed pump is further increased, the working speed is further increased, the necessary flow protection is prevented from being increased, and the risk of the variable-rotation pump is further is not increased, and the self-speed is prevented from being changed, and the working pump is further is protected.
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| CN111946651B (en) * | 2020-08-12 | 2022-04-12 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Fan stall early warning method and system |
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| CN113431787B (en) * | 2021-07-30 | 2022-07-08 | 西安热工研究院有限公司 | System for preventing recirculation valve of feed pump from leaking under condition of adapting to frequent peak regulation situation |
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