CN103953399B - A kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method - Google Patents

A kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method Download PDF

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CN103953399B
CN103953399B CN201410209557.6A CN201410209557A CN103953399B CN 103953399 B CN103953399 B CN 103953399B CN 201410209557 A CN201410209557 A CN 201410209557A CN 103953399 B CN103953399 B CN 103953399B
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valve
quick closing
steam
information
oil pressure
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CN103953399A (en
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王文营
卢盛阳
牟法海
张伟江
高翔
唐广通
李泽敏
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ELECTRIC POWER SCIENCES RESEARCH INSTITUTE OF STATE GRID HEBEI ELECTRIC POWER Co
State Grid Corp of China SGCC
Hebei Electric Power Construction Adjustment Test Institute
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ELECTRIC POWER SCIENCES RESEARCH INSTITUTE OF STATE GRID HEBEI ELECTRIC POWER Co
State Grid Corp of China SGCC
Hebei Electric Power Construction Adjustment Test Institute
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Abstract

The invention discloses a kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method, wherein monitoring device includes measuring the 1st to the n-th main inlet throttle-stop valve displacement transducer of steam turbine main steam valve, the 1st to m timing steam gate displacement transducer of measurement Steam Turhine Adjustment porthole aperture, the first pressure transducer of measurement servomotor oil pressure, the second pressure transducer of measurement AST oil pressure, measuring the trip circuit of trip signal, high-speed data acquiring device and computer;Wherein on-line monitoring method includes the step initialized, parameter arranges, gathers, reports to the police, shows and inquires about;The invention has the beneficial effects as follows: the real-time online that can realize steam turbine valve closing process is monitored continuously, valve state can be evaluated early warning, and fault fast positioning can be realized, to realizing the maintenance of device predicted property, reduction operation security risk, ensureing that the reliability service of steam turbine is significant.

Description

A kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method
Technical field
The invention belongs to steam turbine and measure diagnostic techniques field, relate to a kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method.
Background technology
Turbo-generator Set hypervelocity is the serious accident in thermal power plant, safety in production can be caused significant damage, enterprise is produced even people's lives and causes significant impact, it it is the main prevention and control content of steam turbine major accident, and the turbine admission valve slow even bite of closedown is the main cause causing hypervelocity, in Its Relevant Technology Standards, clear stipulaties must carry out valve closing time test.But the valve closing time is Millisecond, the control system of situ configuration is because of the sampling period long demand that cannot meet valve closing time test at present, there is also deficiency in valve opening measurement links simultaneously, be mainly manifested in: current all steam turbines be all the stroke measuring valve servomotor to represent valve opening, but occur valve door rod come off etc. fault time servomotor stroke can not truly reflect valve opening;In addition the partial admission valve of steam turbine uses the method that valve open/close state measured by travel switch, when there are the problems such as poor contact of contacts at travel switch, then valve state loses monitoring, and the trend of valve closing overall process when testing the shut-in time, can not be reflected, it is not easy to accident analysis.
Valve closing time test method is by valve servomotor stroke under unit outage state at present, the signals such as travel switch access high-speed record instrument and carry out testing and carrying out off-line manual analysis, test is cannot be carried out under steam turbine operation state, but due to temperature distortion during steam turbine operation, the reasons such as gap change cause the probability of the slow even bite of valve closing bigger, unit valve state is caused to lose monitoring means properly functioning, valve can not find after breaking down in time, there is great potential safety hazard, it is thus desirable to realize on-line monitoring, the closing process of steam turbine valve during monitoring unit tripping in real time.Simultaneously because the reason of failsafe valve is more complicated, valve break down after trouble location location difficulty, it is often necessary to simulated failure state is investigated one by one again, it is therefore necessary to carry out on-line fault diagnosis.
Summary of the invention
The technical problem to be solved be to provide a kind of can monitor in real time, online fault location, the turbine admission valve quick closing valve process monitoring equipment reducing steam turbine operation risk and on-line monitoring method.
A kind of turbine admission valve quick closing valve process monitoring equipment and on-line monitoring method is employed technical scheme comprise that by solving above-mentioned technical problem;Wherein turbine admission valve quick closing valve process monitoring equipment includes measuring the 1st to the n-th main inlet throttle-stop valve displacement transducer of steam turbine main steam valve, measuring the 1st to m timing steam gate displacement transducer of Steam Turhine Adjustment porthole aperture, the first pressure transducer of measurement servomotor oil pressure, the second pressure transducer of measurement AST oil pressure, the measurement trip circuit of trip signal, high-speed data acquiring device and computer;Described n is the integer more than or equal to 2 less than 12;Described m is the integer more than or equal to 2 less than 12;
Described 1st to the n-th main inlet throttle-stop valve displacement transducer is arranged in steam turbine main inlet throttle-stop valve door rod;Described 1st to m timing steam gate displacement transducer is arranged in Steam Turhine Adjustment porthole door rod;
Described first pressure transducer is arranged on admission valve servomotor;Described second pressure transducer is arranged on AST oil pipe line;The relay normally open contact J-1 two ends of the input termination crisis warning system ETS of described trip circuit;
The outfan of described 1st to the n-th main inlet throttle-stop valve displacement transducer, the 1st to m timing steam gate displacement transducer, the first pressure transducer, the second pressure transducer and trip circuit connects the respective input of described high-speed data acquiring device respectively;The outfan of described high-speed data acquiring device is connected with computer by USB port.
Described trip circuit includes relay J 1;The coil of described relay J 1 is connected with the relay normally open contact J-1 of crisis warning system ETS and is followed by between the positive pole and negative pole of+24V DC source, and normally-closed contact J1-1 two ends O1 to O2 of described relay J 1 connects the corresponding trip signal input of described high-speed data acquiring device respectively.
The model of described displacement transducer is LVDT;The model of described first pressure transducer is 3051CG;The model of described second pressure transducer is 3051CG;The model of described high-speed data acquiring device is CompactDAQ-9229;Described relay model MY4J;The model of described computer is X201.
Utilize described turbine admission valve quick closing valve process monitoring equipment that turbine admission valve quick closing valve process is carried out on-line monitoring method step as follows:
(1) the 1st to the n-th main inlet throttle-stop valve displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in steam turbine main inlet throttle-stop valve door rod;1st to m timing steam gate displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in Steam Turhine Adjustment porthole door rod;
First pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on admission valve servomotor;Second pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on AST oil pipe line;The relay normally open contact J-1 two ends of the input termination crisis warning system ETS of described turbine admission valve quick closing valve process monitoring equipment trip circuit;
(2) described high-speed data acquiring device is initialized, then carry out parameter setting, passage, physical quantity and the sensitivity of quantities signal, sample frequency, the setting of time threshold values can be carried out, after preservation, enter state to be collected, wait triggering collection;
Described triggering start and stop acquisition condition is designed as: set trip signal as switching value, it is by the Spline smoothing trigger condition as data acquisition being disconnected to Guan Bi, set all valve openings less than setting aperture or trip signal by being disconnected to after the Spline smoothing of Guan Bi the moment of 30s as the termination condition of data acquisition, when i.e. valve opening such as less than sets aperture, if valve is turned off, terminate data acquisition, if valve opening is always more than setting aperture when valve closing is slow or there is jam faults, then gather the data of 30s after tripping;Gather the normal valve opening information of quick closing valve process under valve different opening, servomotor oil pressure information, AST oil pressure information, trip signal information as the normal state information of valve quick closing valve process;Set the valve quick closing's time of normal quick closing valve process as time threshold values;
(3) the normal valve opening information of quick closing valve process under the corresponding aperture of valve, servomotor oil pressure information, AST oil pressure information, trip signal information are gathered as the normal state information of valve quick closing valve process;
(4) taking trip signal by the Spline smoothing moment being disconnected to Guan Bi is valve delay time to the time difference in action moment valve, trip signal is by being disconnected to Spline smoothing moment of Guan Bi to valve opening less than setting the time difference in aperture moment as valve quick closing's time, on a computer display display delay time, quick closing's time and quick closing valve conditional curve;Valve quick closing's time such as less than sets time threshold values and shows " normally " the most on a computer display; such as larger than set time threshold values and then show " exceeding standard "; send alarm signal startup separator diagnostic module; parameter information and the normal state information of monitoring are compared, information convergence analysis; if tripping operation late gate exception time delay or AST oil pressure Information abnormity, then fault location is in electronic loop part;If AST oil pressure information is normal after Tiao Zha, servomotor oil pressure Information abnormity, then fault location is at hydraulic part;If normally, fault location is at mechanical part for AST oil pressure, servomotor oil pressure information after Tiao Zha;Fault diagnosis shows trouble location and possible cause on computer display after completing;
(5) after sending alarm signal, maintainer checks defect elimination, is revised by the diagnostic rule of phenomenon of the failure, feature, reason or adds in Fault Diagnosis Database.
The invention has the beneficial effects as follows: the present invention is directed to the drawback of current steam turbine valve closing process monitoring method, propose a kind of steam turbine valve closing process on-Line Monitor Device and method for diagnosing faults, the real-time online that can realize steam turbine valve closing process is monitored continuously, valve state is evaluated early warning and fault fast positioning can be realized, to realizing the maintenance of device predicted property, reduce and run security risk, ensure that the reliability service of steam turbine is significant.
Accompanying drawing explanation
Fig. 1 is the turbine admission valve quick closing valve process monitoring equipment of the present invention.
Fig. 2 is trip circuit schematic diagram.
The on-line monitoring method program flow diagram of Fig. 3 present invention.
Fig. 4 is the valve quick closing valve curve synoptic diagram of the present invention.
In the diagram,t 0For the trip signal action moment,t 1The action moment is started for valve,t 2For valve opening less than setting the aperture moment,t 3For the 30s moment after trip signal action, 1 is trip signal, and 2 is valve opening.
Detailed description of the invention
From the embodiment shown in Fig. 1-4, turbine admission valve quick closing valve process monitoring equipment includes measuring the 1st to the n-th main inlet throttle-stop valve displacement transducer of steam turbine main steam valve, measuring the 1st to m timing steam gate displacement transducer of Steam Turhine Adjustment porthole aperture, the first pressure transducer of measurement servomotor oil pressure, the second pressure transducer of measurement AST oil pressure, the measurement trip circuit of trip signal, high-speed data acquiring device and computer;Described n is the integer more than or equal to 2 less than 12;Described m is the integer more than or equal to 2 less than 12;
Described 1st to the n-th main inlet throttle-stop valve displacement transducer is arranged in steam turbine main inlet throttle-stop valve door rod;Described 1st to m timing steam gate displacement transducer is arranged in Steam Turhine Adjustment porthole door rod;
Described first pressure transducer is arranged on admission valve servomotor;Described second pressure transducer is arranged on AST oil pipe line;The relay normally open contact J-1 two ends of the input termination crisis warning system ETS of described trip circuit;
The outfan of described 1st to the n-th main inlet throttle-stop valve displacement transducer, the 1st to m timing steam gate displacement transducer, the first pressure transducer, the second pressure transducer and trip circuit connects the respective input of described high-speed data acquiring device respectively;The outfan of described high-speed data acquiring device is connected with computer by USB port.
Described trip circuit includes relay J 1;The coil of described relay J 1 is connected with the relay normally open contact J-1 of crisis warning system ETS and is followed by between the positive pole and negative pole of+24V DC source, and normally-closed contact J1-1 two ends O1 to O2 of described relay J 1 connects the corresponding trip signal input of described high-speed data acquiring device respectively.
The model of described displacement transducer is LVDT;The model of described first pressure transducer is 3051CG;The model of described second pressure transducer is 3051CG;The model of described high-speed data acquiring device is CompactDAQ-9229;Described relay model MY4J;The model of described computer is X201.
Utilize described turbine admission valve quick closing valve process monitoring equipment that turbine admission valve quick closing valve process is carried out on-line monitoring method step as follows:
(1) the 1st to the n-th main inlet throttle-stop valve displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in steam turbine main inlet throttle-stop valve door rod;1st to m timing steam gate displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in Steam Turhine Adjustment porthole door rod;
First pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on admission valve servomotor;Second pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on AST oil pipe line;The relay normally open contact J-1 two ends of the input termination crisis warning system ETS of described turbine admission valve quick closing valve process monitoring equipment trip circuit;
(2) described high-speed data acquiring device is initialized, then carry out parameter setting, passage, physical quantity and the sensitivity of quantities signal, sample frequency, the setting of time threshold values can be carried out, after preservation, enter state to be collected, wait triggering collection;
Described triggering start and stop acquisition condition is designed as: set trip signal as switching value, it is by the Spline smoothing trigger condition as data acquisition being disconnected to Guan Bi, set all valve openings less than setting aperture or trip signal by being disconnected to after the Spline smoothing of Guan Bi the moment of 30s as the termination condition of data acquisition, when i.e. valve opening such as less than sets aperture, if valve is turned off, terminate data acquisition, if valve opening is always more than setting aperture when valve closing is slow or there is jam faults, then gather the data of 30s after tripping;Gather the normal valve opening information of quick closing valve process under valve different opening, servomotor oil pressure information, AST oil pressure information, trip signal information as the normal state information of valve quick closing valve process;Set the valve quick closing's time of normal quick closing valve process as time threshold values;
(3) the normal valve opening information of quick closing valve process under the corresponding aperture of valve, servomotor oil pressure information, AST oil pressure information, trip signal information are gathered as the normal state information of valve quick closing valve process;
(4) taking trip signal by the Spline smoothing moment being disconnected to Guan Bi is valve delay time to the time difference in action moment valve, trip signal is by being disconnected to Spline smoothing moment of Guan Bi to valve opening less than setting the time difference in aperture moment as valve quick closing's time, on a computer display display delay time, quick closing's time and quick closing valve conditional curve;Valve quick closing's time such as less than sets time threshold values and shows " normally " the most on a computer display; such as larger than set time threshold values and then show " exceeding standard "; send alarm signal startup separator diagnostic module; parameter information and the normal state information of monitoring are compared, information convergence analysis; if tripping operation late gate exception time delay or AST oil pressure Information abnormity, then fault location is in electronic loop part;If AST oil pressure information is normal after Tiao Zha, servomotor oil pressure Information abnormity, then fault location is at hydraulic part;If normally, fault location is at mechanical part for AST oil pressure, servomotor oil pressure information after Tiao Zha;Fault diagnosis shows trouble location and possible cause on computer display after completing;
(5) after sending alarm signal, maintainer checks defect elimination, is revised by the diagnostic rule of phenomenon of the failure, feature, reason or adds in Fault Diagnosis Database.
Turbine admission valve includes all main inlet throttle-stop valves, timing steam gate, described admission valve aperture takes the relative value of admission valve door rod stroke, i.e. in all main inlet throttle-stop valve door rod, in timing steam gate door rod rather than on servomotor, displacement transducer is installed, measures the relative value of valve door rod stroke as valve opening.Described pressure transducer time constant≤10ms, the output signal of described tripping relay pickup crisis warning system (ETS) system.The quantities characterizing valve state is converted to the discernible analog quantity of high-speed data acquiring device or switching value by sensor group.
The model that described high-speed data acquiring device uses is NI-CompactDAQ-9229, effect be the signal come from sensor unit transmission is amplified, filters, analog-to-digital conversion process, carry out high-speed signal acquisition and by the transmission of USB connecting line to data handling machine by the sample frequency (being typically set to 1kHz) set.
Described computer controls the operation of high-speed data acquiring device, and processes, stores and show measurement data, and programmable software of the present invention uses LabVIEW exploitation.
Monitoring flow process is: first design main interface layout, then perform to initialize and variable is assigned to default value and control is set to default conditions, give tacit consent to entrance afterwards and " gather " module, " YES " is selected then high-speed data acquiring device to be detected, then parameter setting is carried out, passage can be carried out, physical quantity and the sensitivity of quantities signal, sample frequency, the setting of time threshold values, state to be collected is entered after preservation, wait manual triggering collection or triggering collection, figure can be shown during collection, data list, parameter calculates, data storages etc. operate, the meeting display alarm information if the shut-in time calculated exceeds standard, and it is stored in warning message storehouse, automatic spring fault diagnosis interface afterwards, display probable trouble area.Such as enquiry of historical data, " history file " module can be entered at main interface, call the historical data of storage, the operations such as figure, data list, parameter calculating can be shown simultaneously, the meeting display alarm information if the shut-in time calculated exceeds standard, and it is stored in warning message storehouse, afterwards automatic spring fault diagnosis interface, show probable trouble area.Main interface " alarm module " module can inquire about the All Alerts event of storage.Main interface " diagnostic module " comprises feature and the diagnostic rule thereof of common failsafe valve, the content that user can add according to maintenance situation, revise in data base.
Present invention improves over metering system and the method for testing of valve closing process of existing turbine admission valve aperture, by many monitoring parameters information and the comparison of normal state information and information convergence analysis, achieve monitoring and the on-line fault diagnosis in real time of steam turbine valve closing process, improve the controllability of valve state and the ageing of troubleshooting, to realizing the maintenance of device predicted property, reduce and run security risk, ensure that the reliability service of steam turbine is significant.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.Multiple amendment to these embodiments will be apparent from for those skilled in the art, and generic principles defined herein can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.

Claims (1)

1. one kind carries out on-line monitoring method to turbine admission valve quick closing valve process, it utilizes turbine admission valve quick closing valve process monitoring equipment to be monitored, and described turbine admission valve quick closing valve process monitoring equipment includes measuring the 1st to the n-th main inlet throttle-stop valve displacement transducer of steam turbine main steam valve, measuring the 1st to m timing steam gate displacement transducer of Steam Turhine Adjustment porthole aperture, the first pressure transducer of measurement servomotor oil pressure, the second pressure transducer of measurement AST oil pressure, the measurement trip circuit of trip signal, high-speed data acquiring device and computer;Described n is the integer more than or equal to 2 less than 12;Described m is the integer more than or equal to 2 less than 12;
Described 1st to the n-th main inlet throttle-stop valve displacement transducer is arranged in steam turbine main inlet throttle-stop valve door rod;Described 1st to m timing steam gate displacement transducer is arranged in Steam Turhine Adjustment porthole door rod;
Described first pressure transducer is arranged on admission valve servomotor;Described second pressure transducer is arranged on AST oil pipe line;The two ends of the relay normally open contact J-1 of the input termination crisis warning system ETS of described trip circuit;
The outfan of described 1st to the n-th main inlet throttle-stop valve displacement transducer, the 1st to m timing steam gate displacement transducer, the first pressure transducer, the second pressure transducer and trip circuit connects the respective input of described high-speed data acquiring device respectively;The outfan of described high-speed data acquiring device is connected with computer by USB port;Described trip circuit includes relay J 1;The coil of described relay J 1 is connected with the relay normally open contact J-1 of crisis warning system ETS and is followed by between the positive pole and negative pole of+24V DC source, and normally-closed contact J1-1 two ends O1 to O2 of described relay J 1 connects the corresponding trip signal input of described high-speed data acquiring device respectively;The model of described displacement transducer is LVDT;The model of described first pressure transducer is 3051CG;The model of described second pressure transducer is 3051CG;The model of described high-speed data acquiring device is CompactDAQ-9229;Described relay model MY4J;The model of described computer is X201;
Concrete monitoring method comprises the following steps:
(1) the 1st to the n-th main inlet throttle-stop valve displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in steam turbine main inlet throttle-stop valve door rod;1st to m timing steam gate displacement transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged in Steam Turhine Adjustment porthole door rod;
First pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on admission valve servomotor;Second pressure transducer of described turbine admission valve quick closing valve process monitoring equipment is arranged on AST oil pipe line;The relay normally open contact J-1 two ends of the input termination crisis warning system ETS of described turbine admission valve quick closing valve process monitoring equipment trip circuit;
(2) described high-speed data acquiring device is initialized, then carry out parameter setting, passage, physical quantity and the sensitivity of quantities signal, sample frequency, the setting of time threshold values can be carried out, after preservation, enter state to be collected, wait triggering collection;
Described triggering start and stop acquisition condition is designed as: set trip signal as switching value, it is by the Spline smoothing trigger condition as data acquisition being disconnected to Guan Bi, set all valve openings less than setting aperture or trip signal by being disconnected to after the Spline smoothing of Guan Bi the moment of 30s as the termination condition of data acquisition, when i.e. valve opening such as less than sets aperture, if valve is turned off, terminate data acquisition, if valve opening is always more than setting aperture when valve closing is slow or there is jam faults, then gather the data of 30s after tripping;Gather the normal valve opening information of quick closing valve process under valve different opening, servomotor oil pressure information, AST oil pressure information, trip signal information as the normal state information of valve quick closing valve process;Set the valve quick closing's time of normal quick closing valve process as time threshold values;
(3) the normal valve opening information of quick closing valve process under the corresponding aperture of valve, servomotor oil pressure information, AST oil pressure information, trip signal information are gathered as the normal state information of valve quick closing valve process;
(4) taking trip signal by the Spline smoothing moment being disconnected to Guan Bi is valve delay time to the time difference in action moment valve, trip signal is by being disconnected to Spline smoothing moment of Guan Bi to valve opening less than setting the time difference in aperture moment as valve quick closing's time, on a computer display display delay time, quick closing's time and quick closing valve conditional curve;Valve quick closing's time such as less than sets time threshold values and shows " normally " the most on a computer display; such as larger than set time threshold values and then show " exceeding standard "; send alarm signal startup separator diagnostic module; parameter information and the normal state information of monitoring are compared, information convergence analysis; if tripping operation late gate exception time delay or AST oil pressure Information abnormity, then fault location is in electronic loop part;If AST oil pressure information is normal after Tiao Zha, servomotor oil pressure Information abnormity, then fault location is at hydraulic part;If normally, fault location is at mechanical part for AST oil pressure, servomotor oil pressure information after Tiao Zha;Fault diagnosis shows trouble location and possible cause on computer display after completing;
(5) after sending alarm signal, maintainer checks defect elimination, is revised by the diagnostic rule of phenomenon of the failure, feature, reason or adds in Fault Diagnosis Database.
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