CN110593964A - Fault diagnosis method and system for quick closing valve and opening process of water supply pump steam turbine - Google Patents
Fault diagnosis method and system for quick closing valve and opening process of water supply pump steam turbine Download PDFInfo
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- CN110593964A CN110593964A CN201910881882.XA CN201910881882A CN110593964A CN 110593964 A CN110593964 A CN 110593964A CN 201910881882 A CN201910881882 A CN 201910881882A CN 110593964 A CN110593964 A CN 110593964A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a fault diagnosis method for a quick closing valve and opening process of a water supply pump steam turbine, which comprises the following steps: sending a starting instruction to a quick oil closing control valve and a starting oil control valve; monitoring the output oil pressure of the two components in real time; judging whether the oil pressure reaches rated speed-closing oil pressure within the time period of 0-t 1, and if not, judging that the speed-closing oil control valve has a fault; if yes, judging whether the oil pressure is kept in the allowable speed-closing oil pressure range within the time period from t1 to t2, if not, enabling the speed-closing oil control valve electric control signal circuit to normally act, and enabling the mechanical valve body or the oil circuit to be in fault; judging whether the oil pressure reaches the rated starting oil pressure within the time period of 0-t 1, and if not, judging that the starting oil control valve has a fault; if yes, whether the oil pressure is kept in the allowable starting oil pressure range within the time period from t1 to t2 is judged, if not, the electric control signal circuit of the starting oil control valve operates normally, and the mechanical valve body or the oil way breaks down. The invention also discloses a system for diagnosing the faults in the water supply pump turbine quick closing valve opening process, and the system has the beneficial effects.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a fault diagnosis method for a water supply pump steam turbine quick closing valve opening process. The invention also relates to a fault diagnosis system for the water supply pump steam turbine quick closing valve opening process.
Background
With the development of thermal power generation technology, more and more electric power equipment has been widely used.
The water feeding pump turbine is an important auxiliary device in a thermal power plant, plays a role of providing high-pressure accumulated water for a boiler, and has great significance for the power plant in safe operation. For the water supply pump turbine adopting the quick-closing component and the quick-closing valve to be matched and adjusted, whether the quick-closing valve can be normally opened is a main condition for the success or failure of the brake hanging of the water supply pump turbine. However, because the stress conditions are different, the quick-closing valve can be normally opened under the static condition, when steam exists in front of the quick-closing valve or the steam pressure in front of the quick-closing valve is higher, the starting oil pressure and the quick-closing oil pressure of the quick-closing valve can be changed in the opening process, and the condition that the water supply pump steam turbine fails to be hung on a brake affects the reliable operation of a power plant and has adverse effects on the normal load of the power plant.
At present, the problems of low oil pressure of quick closing and failure of hanging a brake are easily caused in the process of hanging the brake when steam or steam pressure is higher in front of a quick closing valve of a water supply pump steam turbine, an original system is only provided with an on-site pressure gauge, an operator needs to monitor the on-site pressure gauge when the system is started, the oil pressure condition is inconvenient to monitor and can not be reproduced, and accident analysis is inconvenient. Meanwhile, the quick-closing valve is influenced by two oil flows, namely starting oil and quick-closing oil, in the opening process, when the steam pressure of a feed pump steam turbine in front of the quick-closing valve is high, the operating states of oil paths of the two oil flows are influenced, for example, the oil pressure fluctuates, and the operation of an electromagnetic valve for controlling the starting oil and an electromagnetic valve for controlling the quick-closing oil fails. However, since the steam pressure before the quick closing valve affects both the start oil path and the quick closing oil path, in the prior art, a technician cannot accurately judge whether the start oil path or the quick closing oil path has an operation fault, which easily causes the problems of delayed maintenance schedule, wasted maintenance time and overhigh maintenance cost.
Therefore, how to monitor the operation states of the starting oil circuit and the quick closing oil circuit in the quick closing valve process of the water supply pump turbine so as to accurately judge the failed oil circuit when the quick closing valve and the brake hanging fail, thereby saving the maintenance time and the maintenance cost, and solving the technical problem faced by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a fault diagnosis method for a quick closing valve opening process of a water supply pump turbine, which can monitor the running states of a starting oil path and a quick closing oil path in the quick closing valve process of the water supply pump turbine so as to accurately judge the faulted oil path when the quick closing valve fails to be hung, thereby saving maintenance time and maintenance cost. The invention further aims to provide a fault diagnosis system for the quick closing valve opening process of the water supply pump steam turbine.
In order to solve the technical problem, the invention provides a fault diagnosis method for a water supply pump steam turbine quick closing valve opening process, which comprises the following steps:
sending a starting instruction to a quick closing oil control valve and a starting oil control valve which are communicated with the quick closing valve;
monitoring the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting instruction in real time;
judging whether the output oil pressure of the starting oil control valve reaches the rated starting oil pressure within a time period of 0-t 1, and if not, judging that the starting oil control valve has a fault; if yes, continuously judging whether the output oil pressure of the starting oil control valve is kept in an allowable starting oil pressure range within a time period from t1 to t2, and if not, enabling the starting oil control valve to be in a fault state;
judging whether the output oil pressure of the speed-closing oil control valve reaches a rated speed-closing oil pressure within a time period of 0-t 1, and if not, judging that the speed-closing oil control valve has a fault; if yes, continuously judging whether the output oil pressure of the speed-closing oil control valve is kept in an allowable speed-closing oil pressure range within a time period from t1 to t2, and if not, enabling the speed-closing oil control valve to be in a fault state;
and t1 and t2 are preset time nodes determined according to the operation condition of the quick closing valve.
Preferably, the method for controlling the quick closing oil valve and the starting oil valve sends a starting instruction to the quick closing oil control valve and the starting oil control valve which are communicated with the quick closing valve, and specifically comprises the following steps:
receiving a rapid closing valve and hanging brake instruction triggered by user operation through an upper computer;
and converting the quick closing valve hanging instruction into a starting instruction through an upper computer, and respectively sending the starting instruction to the quick closing oil control valve and the starting oil control valve.
Preferably, the method for controlling the engine further comprises the step of sending a start instruction to a quick-closing oil control valve and a start oil control valve which are communicated with the quick-closing valve, and further comprises the following steps:
sending the starting instruction to a starting oil time relay which is in signal connection with the starting oil control valve and is used for controlling the running state of the starting oil control valve through an upper computer, so that the starting oil time relay controls the starting oil control valve to enter an output station and keeps the preset time;
and sending the starting instruction to a quick oil-closing time relay which is in signal connection with the quick oil-closing control valve and is used for controlling the running state of the quick oil-closing control valve through an upper computer, so that the quick oil-closing time relay controls the quick oil-closing control valve to enter an output station and keeps the preset time.
Preferably, the monitoring of the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting instruction in real time specifically includes:
the output oil pressure value is detected by a quick closing oil pressure sensor communicated with the output oil passage of the quick closing oil control valve, and the output oil pressure value is detected by a starting oil pressure sensor communicated with the output oil passage of the starting oil control valve.
Preferably, the monitoring of the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting command in real time further includes:
and receiving real-time detection results sent by the quick oil closing pressure sensor and the starting oil pressure sensor through an upper computer, and drawing a time-pressure relation curve graph of the quick oil closing control valve and the starting oil control valve according to the real-time detection results.
Preferably, the method further comprises the following steps:
judging whether the output oil pressure of the speed-closing oil control valve is reduced to be below the gear-shifting closing oil pressure within the time period from t3 to t2 according to the time-pressure relation graph, and if so, judging that an auxiliary slide valve in signal connection with the speed-closing valve fails;
wherein t3 is the operation state holding time of the starting oil time relay.
Preferably, the method further comprises the following steps:
and detecting the movement position of the valve rod through a travel switch arranged on the valve rod of the quick-closing valve, judging whether the valve rod moves from a closing station to an opening station within a time period from t1 to t2, and if not, enabling the valve rod to be in a fault.
The invention also provides a fault diagnosis system for the water supply pump steam turbine quick closing valve opening process, which comprises the following steps:
the command sending module is used for sending a starting command to the quick-closing oil control valve and the starting oil control valve which are communicated with the quick-closing valve;
the oil pressure monitoring module is used for monitoring the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting instruction in real time;
the first judgment module is used for judging whether the output oil pressure of the speed-closing oil control valve reaches rated speed-closing oil pressure within a time period of 0-t 1, and if not, the speed-closing oil control valve has a fault;
the second judgment module is used for judging whether the output oil pressure of the speed-closing oil control valve is kept in an allowable speed-closing oil pressure range within a time period from t1 to t2, and if not, the speed-closing oil control valve is in a fault state;
the third judgment module is used for judging whether the output oil pressure of the starting oil control valve reaches the rated starting oil pressure within the time period of 0-t 1, and if not, the starting oil control valve breaks down;
the fourth judgment module is used for judging whether the output oil pressure of the starting oil control valve is kept in an allowable starting oil pressure range within a time period from t1 to t2 or not, and if not, the starting oil control valve is in a fault state;
and t1 and t2 are preset time nodes determined according to the operation condition of the quick closing valve.
The fault diagnosis method for the quick closing valve opening process of the water feeding pump steam turbine mainly comprises four steps, wherein in the first step, the main content is that when the quick closing valve opening process is just started, starting instructions are sent to a quick closing oil control valve and a starting oil control valve which are communicated with the quick closing valve, so that the quick closing oil control valve and the starting oil control valve are switched to an operation station after receiving the starting instructions. In the second step, after the quick-closing oil control valve and the starting oil control valve enter the running state, the output oil pressures of the quick-closing oil control valve and the starting oil control valve are monitored in real time, and the running states of the quick-closing oil circuit and the starting oil circuit are possibly influenced by the steam pressure before the quick-closing valve, and the influence is mainly reflected on the output oil pressure, so that the influence on the starting oil circuit and the quick-closing oil circuit can be clearly known by monitoring the output oil pressures of the quick-closing oil control valve and the starting oil control valve. In the third step, whether the output oil pressure of the starting oil control valve reaches the rated starting oil pressure within the time period of 0-t 1 is judged according to the monitoring result of the output oil pressure of the starting oil control valve, if the output oil pressure does not reach the rated starting oil pressure, the starting oil control valve is in failure, and technicians need to maintain the starting oil control valve; if the rated starting oil pressure is reached, whether the rated starting oil pressure is kept within the allowable starting oil pressure range in the time period from t1 to t2 or not is continuously judged, and if the rated starting oil pressure is not kept within the allowable starting oil pressure range, the starting oil control valve is still proved to be in fault and needs to be repaired. In the fourth step, whether the output oil pressure of the quick oil closing control valve reaches the rated quick oil closing pressure within the time period of 0-t 1 is judged according to the monitoring result of the output oil pressure of the quick oil closing control valve, if the output oil pressure does not reach the rated quick oil closing pressure, the quick oil closing control valve is in failure, and technicians need to maintain the quick oil closing control valve; if the rated speed closing oil pressure is reached, whether the rated speed closing oil pressure is kept within the allowable speed closing oil pressure range in the time period from t1 to t2 or not is continuously judged, and if the rated speed closing oil pressure is not kept within the allowable speed closing oil pressure range, the fact that the speed closing oil control valve is in failure is still indicated, and the speed closing oil control valve needs to be repaired. Therefore, according to the fault diagnosis method for the water supply pump steam turbine quick-closing valve opening process, the oil pressure change of the output oil pressure of the quick-closing oil control valve and the starting oil control valve is monitored in real time in the development process of the quick-closing oil control valve and the starting oil control valve, and whether the running states of the quick-closing oil way and the starting oil way are in fault or not can be accurately judged according to the comparison between the monitoring result and the expected target of the output oil pressure in two time periods after the valve opening, so that technicians can accurately maintain the faulted oil way, and the maintenance time and the maintenance cost are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a block diagram of a prior art control assembly for opening a quick closing valve of a feed pump turbine.
Fig. 3 is a graph of time versus pressure in accordance with an embodiment of the present invention.
FIG. 4 is a block diagram of an embodiment of the present invention.
Wherein, in fig. 2:
quickly closing the oil control valve-1, starting the oil control valve-2 and an auxiliary slide valve-3;
in fig. 4:
the device comprises a command sending module-4, an oil pressure monitoring module-5, a first judgment module-6, a second judgment module-7, a third judgment module-8 and a fourth judgment module-9.
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.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of the present invention.
In one embodiment provided by the invention, the fault diagnosis method for the quick closing valve opening process of the water supply pump turbine mainly comprises four steps.
In the first step, the main content is that when the quick closing valve opening process is just started, starting instructions are sent to the quick closing oil control valve 1 and the starting oil control valve 2 which are communicated with the quick closing valve, so that the quick closing oil control valve 1 and the starting oil control valve 2 are switched to an operation station after receiving the starting instructions.
In the second step, after the quick-closing oil control valve 1 and the starting oil control valve 2 enter the operating state, the output oil pressures of the quick-closing oil control valve 1 and the starting oil control valve 2 are monitored in real time, and the operating states of the quick-closing oil circuit and the starting oil circuit are possibly influenced by the steam pressure before the quick-closing valve at the same time, and the influence is mainly reflected on the output oil pressure, so that the influence on the starting oil circuit and the quick-closing oil circuit can be clearly known by monitoring the output oil pressures of the quick-closing oil control valve 1 and the starting oil control valve 2.
In the third step, whether the output oil pressure of the starting oil control valve 2 reaches the rated starting oil pressure within the time period of 0-t 1 is judged according to the monitoring result of the output oil pressure of the starting oil control valve 2, if the output oil pressure does not reach the rated starting oil pressure, the starting oil control valve 2 is indicated to have a fault, and a technician needs to maintain the starting oil control valve; if the rated starting oil pressure is reached, the electronic control circuit is normal, whether the electronic control circuit is kept in the allowable starting oil pressure range in the time period from t1 to t2 or not is judged, if the electronic control circuit is not kept in the allowable starting oil pressure range, the mechanical valve body or the oil circuit of the starting oil control valve 2 is failed, and the electronic control circuit needs to be maintained.
In the fourth step, whether the output oil pressure of the quick oil closing control valve 1 reaches the rated speed oil closing pressure within the time period of 0-t 1 is judged according to the monitoring result of the output oil pressure of the quick oil closing control valve 1, if the output oil pressure does not reach the rated speed oil closing pressure, the quick oil closing control valve 1 is in failure, and technicians need to maintain the quick oil closing control valve; if the rated speed closing oil pressure is reached, the electronic control circuit is normal, whether the electronic control circuit is kept in the allowable speed closing oil pressure range in the time period from t1 to t2 or not is judged, if the electronic control circuit is not kept in the allowable speed closing oil pressure range, the mechanical valve body or the oil circuit of the speed closing oil control valve 1 is in failure, and maintenance is needed.
Therefore, according to the fault diagnosis method for the water supply pump turbine quick-closing valve opening process, in the development process of the quick-closing oil control valve 1 and the starting oil control valve 2, the oil pressure change of the output oil pressure is monitored in real time, and then whether the running states of the quick-closing oil way and the starting oil way are faulted or not can be accurately judged according to the comparison between the monitoring result and the expected target of the output oil pressure in two time periods after the valve opening, so that technicians can accurately maintain the faulted oil way, and the maintenance time and the maintenance cost are saved. In addition, the application of this embodiment need not to make changes to current feed pump steam turbine speed control system and quick closing valve open valve control subassembly etc. convenient using widely.
In the first step, the starting instructions sent to the quick oil closing control valve 1 and the starting oil control valve 2 can be realized by an upper computer. Specifically, when the quick closing valve is required to be opened and closed, a technician can operate the quick closing valve on the upper computer through keys and the like, and a sending instruction of the upper computer is triggered through user operation, so that the quick closing valve and closing instruction is converted into a starting instruction by the upper computer and is respectively sent to the quick closing oil control valve 1 and the starting oil control valve 2. The quick-closing oil control valve 1 and the starting oil control valve 2 are generally electromagnetic directional valves, and can remotely receive control signals sent by an upper computer, and accordingly, stations are switched, and the working state of the hydraulic oil circuit is changed (the specific hydraulic oil circuit refers to a quick-closing valve opening control assembly of a feed pump steam turbine in the prior art, as shown in fig. 2).
In addition, the start oil pressure should change immediately after the brake-on signal is issued, while the quick-off oil pressure may start to change after 25 seconds. If the starting oil pressure does not change immediately, it indicates that the starting oil is not pressurized, and thus the oil pressure cannot be established even when the oil is closed, so that it is also possible to determine whether the operation of the starting oil control valve 2 is malfunctioning by determining whether the starting oil pressure changes immediately.
Further, the operating states of the quick-closing oil control valve 1 and the starting oil control valve 2 are generally controlled by time relays. Specifically, the control end of the rapid oil-closing control valve 1 is in signal connection with the rapid oil-closing time relay and can be controlled by the power-on state of the rapid oil-closing time relay. Similarly, the control end of the starting oil control valve 2 is in signal connection with the starting oil time relay and can be controlled by the power-on state of the starting oil time relay. Therefore, the upper computer can send the starting instruction to the quick oil closing time relay and the starting oil time relay at the same time, and the quick oil closing time relay and the starting oil time relay can respectively control the quick oil closing control valve 1 and the starting oil control valve 2 to be switched to an output station and keep the preset time. In this embodiment, the fast oil-off time relay can maintain the charged state for 25s, and the oil-on time relay can maintain the charged state for 60 s.
In the second step, in order to accurately detect the output oil pressures of the quick-closing oil control valve 1 and the starting oil control valve 2, in this step, the real-time output oil pressure value can be detected by the quick-closing oil pressure sensor communicated with the output oil path of the quick-closing oil control valve 1, and similarly, the real-time output oil pressure value can be detected by the starting oil pressure sensor communicated with the output oil path of the starting oil control valve 2. Meanwhile, the quick-closing oil pressure sensor and the starting oil pressure sensor are in signal connection with an upper computer, and monitoring results can be fed back to the upper computer in real time, so that technicians can remotely monitor the valve opening process of the quick-closing valve through the upper computer.
Further, in order to facilitate accurate analysis of the monitoring results of the quick-closing oil pressure sensor and the starting oil pressure sensor by a technician, in the embodiment, after the upper machine station receives the detection results of the quick-closing oil pressure sensor and the starting oil pressure sensor, a time-pressure (t-p) relation graph of the quick-closing oil control valve 1 and the starting oil control valve 2 can be drawn according to the detection results, as shown in fig. 3. In the graph, the time when the upper computer starts to send the start command to the fast oil-off time relay and the start oil time relay may be 0.
In the third step, it is generally determined whether the output oil pressure (PT2) of the starting oil control valve 2 reaches the rated starting oil pressure of 0.8MPa within 0 to 30 seconds, and if not, it is determined that the starting oil control valve 2 has failed. Meanwhile, if the rated starting oil pressure is reached, whether the starting oil pressure is kept within the allowable starting oil pressure range of 0.8 +/-0.3 MPa within 30-180 s can be continuously judged, and if not, the starting oil control valve 2 is indicated to be in fault.
Similarly, in the fourth step, it is generally determined whether the output oil pressure (PT1) of the speed-cut oil control valve 1 reaches the rated speed-cut oil pressure of 0.85MPa within 0 to 30 seconds, and if not, it is determined that the speed-cut oil control valve 1 is malfunctioning. Meanwhile, if the rated speed closing oil pressure is reached, whether the rated speed closing oil pressure is kept within the allowable speed closing oil pressure range of 0.85 +/-0.3 MPa within 30-180 s can be continuously judged, and if not, the fault of the speed closing oil control valve 1 is shown.
Also, an auxiliary spool 3 is also provided to affect the speed-off oil path. On the basis of eliminating the fault of the speed-closing oil control valve 1, whether the output oil pressure of the speed-closing oil control valve 1 drops within 30-60 s or not is judged according to the time-pressure relation graph, and the output oil pressure is below the strain speed-closing oil pressure of 0.75MPad, if yes, the steam pressure influences the oil path of the auxiliary slide valve 3 in the time period, so that the operation of the auxiliary slide valve is in fault, and the related speed-closing oil path is influenced.
The time nodes such as t1, t3, t2 and the like are preset time nodes preset according to the operation condition of the quick closing valve, the specific time can be adjusted according to the actual situation, and the time for starting the oil time relay to keep the power-on state can be determined according to the time t 3.
Furthermore, the present embodiment adds the monitoring and fault diagnosis of the operation state of the quick-closing valve itself. Specifically, in the embodiment, the real-time movement position of the valve rod is detected through a plurality of travel switches arranged on the valve rod of the quick-closing valve, and whether the valve rod moves from the closing station to the opening station within 30-180 s is judged according to the real-time movement position, if yes, the valve rod of the quick-closing valve keeps normal operation along with the normal operation of the starting oil control valve 2 and the quick-closing oil control valve 1, and moves from the closing station to the opening station to realize normal valve opening, namely, the quick-closing valve is successfully hung on the brake; on the contrary, if the valve body is not closed, the operation state of the quick closing valve is in a fault, and the situation that the valve rod is blocked possibly exists, so that maintenance personnel are required to maintain the structure of the quick closing valve.
Fig. 4 is a block diagram of an embodiment of the present invention, as shown in fig. 4.
The embodiment also provides a fault diagnosis system for the quick closing valve and opening process of the water supply pump steam turbine, which mainly comprises an instruction sending module 4, an oil pressure monitoring module 5, a first judging module 6, a second judging module 6, a third judging module 8 and a fourth judging module 9. The instruction sending module 4 is mainly used for sending a starting instruction to the quick-closing oil control valve 1 and the starting oil control valve 2 which are communicated with the quick-closing valve. The oil pressure detection module is mainly used for monitoring the output oil pressure of the oil-closing control valve 1 and the started oil control valve 2 after receiving the starting instruction in real time. The first judgment module 6 is mainly used for judging whether the output oil pressure of the quick-closing oil control valve 1 reaches the rated speed-closing oil pressure within a time period of 0-t 1, and if not, the quick-closing oil control valve 1 goes wrong; the second judging module 6 is mainly used for continuously judging whether the output oil pressure of the speed-closing oil control valve 1 is kept in the allowable speed-closing oil pressure range within the time period from t1 to t2 when the judgment result of the first judging module 6 is yes, and if not, the speed-closing oil control valve 1 is in failure. The third judgment module 8 is mainly used for judging whether the output oil pressure of the starting oil control valve 2 reaches the rated starting oil pressure within a time period of 0-t 1, and if not, the starting oil control valve 2 fails; the fourth determination module 9 is mainly configured to, when the determination result of the third determination module 8 is yes, continuously determine whether the output oil pressure of the starting oil control valve 2 is kept within the allowable starting oil pressure range within a time period from t1 to t2, and if not, the starting oil control valve 2 fails. Wherein, t1 and t2 are preset time nodes determined according to the operation condition of the quick closing valve.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A fault diagnosis method for a quick closing valve and opening process of a water supply pump steam turbine is characterized by comprising the following steps:
sending a starting instruction to a quick closing oil control valve and a starting oil control valve which are communicated with the quick closing valve;
monitoring the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting instruction in real time;
judging whether the output oil pressure of the starting oil control valve reaches the rated starting oil pressure within a time period of 0-t 1, and if not, judging that the starting oil control valve has a fault; if yes, continuously judging whether the output oil pressure of the starting oil control valve is kept in an allowable starting oil pressure range within a time period from t1 to t2, and if not, enabling the starting oil control valve to be in a fault state;
judging whether the output oil pressure of the speed-closing oil control valve reaches a rated speed-closing oil pressure within a time period of 0-t 1, and if not, judging that the speed-closing oil control valve has a fault; if yes, continuously judging whether the output oil pressure of the speed-closing oil control valve is kept in an allowable speed-closing oil pressure range within a time period from t1 to t2, and if not, enabling the speed-closing oil control valve to be in a fault state;
and t1 and t2 are preset time nodes determined according to the operation condition of the quick closing valve.
2. The method for diagnosing faults in the water feeding pump turbine quick closing valve opening process according to claim 1, wherein starting instructions are sent to a quick closing oil control valve and a starting oil control valve which are communicated with the quick closing valve, and the method specifically comprises the following steps:
receiving a rapid closing valve and hanging brake instruction triggered by user operation through an upper computer;
and converting the quick closing valve hanging instruction into a starting instruction through an upper computer, and respectively sending the starting instruction to the quick closing oil control valve and the starting oil control valve.
3. The method for diagnosing the failure in the valve opening process of the quick closing valve of the feed water pump turbine as claimed in claim 2, wherein the method for sending the start command to the quick closing oil control valve and the start oil control valve which are communicated with the quick closing valve further comprises:
sending the starting instruction to a starting oil time relay which is in signal connection with the starting oil control valve and is used for controlling the running state of the starting oil control valve through an upper computer, so that the starting oil time relay controls the starting oil control valve to enter an output station and keeps the preset time;
and sending the starting instruction to a quick oil-closing time relay which is in signal connection with the quick oil-closing control valve and is used for controlling the running state of the quick oil-closing control valve through an upper computer, so that the quick oil-closing time relay controls the quick oil-closing control valve to enter an output station and keeps the preset time.
4. The method for diagnosing the fault in the valve opening process of the quick closing valve of the feedwater pump turbine according to claim 3, wherein the output oil pressures of the quick closing oil control valve and the starting oil control valve after receiving the starting command are monitored in real time, and the method specifically comprises the following steps:
the output oil pressure value is detected by a quick closing oil pressure sensor communicated with the output oil passage of the quick closing oil control valve, and the output oil pressure value is detected by a starting oil pressure sensor communicated with the output oil passage of the starting oil control valve.
5. The method for diagnosing the failure in the valve opening process of the quick closing valve of the feedwater pump turbine as claimed in claim 4, wherein the output oil pressures of the quick closing oil control valve and the starting oil control valve after receiving the starting command are monitored in real time, and further comprising:
and receiving real-time detection results sent by the quick oil closing pressure sensor and the starting oil pressure sensor through an upper computer, and drawing a time-pressure relation curve graph of the quick oil closing control valve and the starting oil control valve according to the real-time detection results.
6. The method for diagnosing the fault in the opening process of the quick closing valve of the feedwater pump turbine according to claim 5, further comprising:
judging whether the output oil pressure of the speed-closing oil control valve is reduced to be below the gear-shifting closing oil pressure within the time period from t3 to t2 according to the time-pressure relation graph, and if so, judging that an auxiliary slide valve in signal connection with the speed-closing valve fails;
wherein t3 is the operation state holding time of the starting oil time relay.
7. The method for diagnosing the fault in the opening process of the quick closing valve of the feedwater pump turbine according to claim 6, further comprising:
and detecting the movement position of the valve rod through a travel switch arranged on the valve rod of the quick-closing valve, judging whether the valve rod moves from a closing station to an opening station within a time period from t1 to t2, and if not, enabling the valve rod to be in a fault.
8. A fault diagnosis system for a quick closing valve and an opening valve process of a water supply pump steam turbine is characterized by comprising the following steps:
the command sending module is used for sending a starting command to the quick-closing oil control valve and the starting oil control valve which are communicated with the quick-closing valve;
the oil pressure monitoring module is used for monitoring the output oil pressure of the quick-closing oil control valve and the output oil pressure of the starting oil control valve after receiving the starting instruction in real time;
the first judgment module is used for judging whether the output oil pressure of the speed-closing oil control valve reaches rated speed-closing oil pressure within a time period of 0-t 1, and if not, the speed-closing oil control valve has a fault;
the second judgment module is used for judging whether the output oil pressure of the speed-closing oil control valve is kept in an allowable speed-closing oil pressure range within a time period from t1 to t2, and if not, the speed-closing oil control valve is in a fault state;
the third judgment module is used for judging whether the output oil pressure of the starting oil control valve reaches the rated starting oil pressure within the time period of 0-t 1, and if not, the starting oil control valve breaks down;
the fourth judgment module is used for judging whether the output oil pressure of the starting oil control valve is kept in an allowable starting oil pressure range within a time period from t1 to t2 or not, and if not, the starting oil control valve is in a fault state;
and t1 and t2 are preset time nodes determined according to the operation condition of the quick closing valve.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5524484A (en) * | 1993-12-22 | 1996-06-11 | Westinghouse Electric Corporation | Solenoid operated valve diagnostic system |
| JPH10311455A (en) * | 1997-05-07 | 1998-11-24 | Tosok Corp | Trouble diagnostic device for solenoid valve |
| CN201372815Y (en) * | 2009-03-16 | 2009-12-30 | 嘉兴爱克斯机械技术有限公司 | Integrated electro-hydraulic actuator for quick closing valve |
| CN102338137A (en) * | 2011-08-25 | 2012-02-01 | 中联重科股份有限公司 | Method for detecting hydraulic valve, controller and device, method for detecting malfunction of hydraulic loop and device and malfunction processing system |
| CN102392914A (en) * | 2011-10-31 | 2012-03-28 | 常德中联重科液压有限公司 | Control method and control system of electro-hydraulic proportional directional valve |
| CN203224329U (en) * | 2013-03-30 | 2013-10-02 | 国家电网公司 | Quick calibrator used for pressure relief valve |
| WO2015019010A1 (en) * | 2013-08-09 | 2015-02-12 | Snecma | Method for monitoring a valve of an aircraft engine |
| CN106051240A (en) * | 2016-06-30 | 2016-10-26 | 江苏省特种设备安全监督检验研究院南通分院 | Safety valve as well as online detecting device and online detecting method of safety valve |
| CN106870023A (en) * | 2017-04-14 | 2017-06-20 | 贵州电网有限责任公司电力科学研究院 | A kind of feed pump turbine governing system quick-closing valve opening device and open method |
| CN208456675U (en) * | 2018-07-06 | 2019-02-01 | 中国神华能源股份有限公司 | Feed Water Pump Turbine Control System |
-
2019
- 2019-09-18 CN CN201910881882.XA patent/CN110593964B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5524484A (en) * | 1993-12-22 | 1996-06-11 | Westinghouse Electric Corporation | Solenoid operated valve diagnostic system |
| JPH10311455A (en) * | 1997-05-07 | 1998-11-24 | Tosok Corp | Trouble diagnostic device for solenoid valve |
| CN201372815Y (en) * | 2009-03-16 | 2009-12-30 | 嘉兴爱克斯机械技术有限公司 | Integrated electro-hydraulic actuator for quick closing valve |
| CN102338137A (en) * | 2011-08-25 | 2012-02-01 | 中联重科股份有限公司 | Method for detecting hydraulic valve, controller and device, method for detecting malfunction of hydraulic loop and device and malfunction processing system |
| CN102392914A (en) * | 2011-10-31 | 2012-03-28 | 常德中联重科液压有限公司 | Control method and control system of electro-hydraulic proportional directional valve |
| CN203224329U (en) * | 2013-03-30 | 2013-10-02 | 国家电网公司 | Quick calibrator used for pressure relief valve |
| WO2015019010A1 (en) * | 2013-08-09 | 2015-02-12 | Snecma | Method for monitoring a valve of an aircraft engine |
| CN106051240A (en) * | 2016-06-30 | 2016-10-26 | 江苏省特种设备安全监督检验研究院南通分院 | Safety valve as well as online detecting device and online detecting method of safety valve |
| CN106870023A (en) * | 2017-04-14 | 2017-06-20 | 贵州电网有限责任公司电力科学研究院 | A kind of feed pump turbine governing system quick-closing valve opening device and open method |
| CN208456675U (en) * | 2018-07-06 | 2019-02-01 | 中国神华能源股份有限公司 | Feed Water Pump Turbine Control System |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国国家经济贸易委员会: "JB/T10365-2002液压电磁换向阀", 《中华人民共和国机械行业标准》 * |
| 杭州汽轮机股份有限公司: "杭汽速关组件说明书", 《百度文库》 * |
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