CN102721821B - On-line system for automatically monitoring oil state of steam turbine oil in use - Google Patents
On-line system for automatically monitoring oil state of steam turbine oil in use Download PDFInfo
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Abstract
The invention discloses an on-line system for automatically monitoring an oil state of steam turbine oil in use. The system comprises a sampling part, a signal acquisition control part and a data transmission and management part, wherein the sampling part acquires a signal of an acquirer and inputs the signal into a signal acquisition control part through a cable for signal processing and transmission; and the data transmission and management part analyzes the signal through communication between a lower computer and an upper computer according to software data of the upper computer. The design concept is that the system can monitor the viscosity and the moisture content of the steam turbine oil and the change of the particle pollution grade in real time and on line; when a viscosity index, a moisture content index or a particle pollution grade index are greater than a set average threshold value or a peak threshold value, the system sounds an audible and visual alarm and indicates workers on the spot to take measures for a steam turbine lubrication oil system; and a phenomenon of running failure of a steam turbine, which is caused by the change of the characteristic of steam turbine lubrication oil, can be avoided.
Description
Technical field
The invention belongs to plant equipment operating condition monitoring technical field, relate to a kind of at usefulness steam turbine oil fluid state online auto monitoring system.
Background technology
As everyone knows, wearing and tearing and insufficient lubrication are the main causes that causes machinery and equipment to damage or break down.The oil liquid monitoring technology that the nearly more than ten years grow up can address this problem preferably, and particularly in recent years, the oil liquid monitoring technology had obtained development rapidly in every profession and trade.Initial oil liquid monitoring only is the oil contamination analysis, mainly is the physical and chemical index of analyzing oil product, as viscosity, moisture, acid number, flash-point, mechanical impurity etc.Usually adopt petroleum products performance index assay method to lubricator detecting, to estimate the variation of its quality.The development of suitability for industrialized production makes the more and more large-scale change of machine, complicated and serialization, and is also more and more higher to the maintenance requirement of machine.Therefore, the Machine Fault Diagnosis technology is arisen at the historic moment, and has impelled the diagnostic method of people's active development based on oil liquid monitoring.
At present, the replacing scheme of plant equipment lubricating oil mainly is with reference to the recommendation oil draining period, and the mode of carrying out by service time or working time decides.Monitoring has become one of indispensable means in most modern industry maintenances based on the machine performance of oil analysis, and the research of the monitoring of equipment state and fault diagnosis, friction wear mechanism, judge lubricating system pollution situation, formulate correct drain period etc. and obtained to use widely aspect several.
In equipment running process; lubricating oil will experience the complexing action of a series of physics or chemistry; the physicochemical property of oil product and inner formation can change; variation except oil product generation itself; lubricating system also can produce some metallic particles or nonmetal wear particle; pollutant in the running environment also can be sneaked in the fluid in addition, as moisture and other pollutants etc.And the oil liquid monitoring system will be sent to the host computer data processor by the ethernet communication cable by on-the-spot round-the-clock real-time dynamic data collection, be sent to central centralized control room by data operation and show with movement form.
Briefly, the oil liquid monitoring technology is exactly by analyzing the situation of monitored plant equipment wear particle in the performance change of using lubricating oil and oil, the acquisition plant equipment is lubricated the information with state of wear, thereby the operating condition of evaluation plant equipment and fault predicted, and further determine the technology of failure cause.Use this Technology Need to fully utilize various analytical test means, as the physico-chemical analysis instrument of routine, infrared spectrometric analyzer, along a grain counter, plasma emission spectrometer, ferrograph analyzer, differential thermal analyzer etc., equipment is lubricated monitoring, in the equipment lubrication management, can reaches good effect.Oil contamination on-line monitoring and control technology are incorporated into oil contamination control field with automatic control technology, change traditional pollution control model, realize real-time dynamic monitoring, control and active maintenance to the oil contamination state.By collection, identification, judgement to the line monitor signal of each parameter such as contamination level of oil liquid, water cut, structure fluid state on_line monitoring network is proposed, the oil contamination state is carried out real-time dynamic monitoring, diagnosis and control, realization is to the active maintenance of lubricating oil and hydraulic system, can raising serviceable life of each components and parts of system, reduce the failure rate of system greatly.
Equipment fluid detection in the past all is the collection in worksite oil sample, goes to finish analysis to the laboratory, and after analysis was finished, data were given on-site maintenance personnel and equipment and technology responsible official again.Because need the plenty of time to transmit oil sample and data, finishing a crude oil sample analysis often needs several hrs at least, reaches several days at most or the several months.And show according to investigations: have 50% off-line analysis oil sample not pinpoint the problems approximately, 45% oil sample shows to lose efficacy and is about to take place, and has 5% oil sample to detect serious problems approximately.Like this, not only consumed a large amount of man power and materials, also be difficult to have guaranteed the ageing of data, can't be really tracing trouble in time.For addressing the above problem, in recent years, western developed country utilizes electronic technology and signal processing technology, developed multiple novel embedded oil analysis sensor, and on this basis,, a series of fluid fast detecting instrument have been developed at various dissimilar equipment.Portable fluid surveying instrument development is swift and violent, overcome the deficiency that laboratory off-line analysis method cost height, complicated operation, measurement result lag behind well, can carry, in-site measurement and scene go out the result, portable fluid surveying instrument comprises portable oil viscosity instrument, ferrograph, grain count instrument etc., but these instruments are not accomplished on-line monitoring truly in reality.
Summary of the invention
The objective of the invention is to develop a kind of in the oil liquid monitoring system that carries out on-line measurement with characteristics such as the oil property of steam turbine oil, water cut, particle contamination degree.
Technical scheme of the present invention is: a kind of with steam turbine oil fluid state online auto monitoring system, comprising: sampling part, signals collecting control section, data transmission and administrative section; Sampling part is partly carried out the signal Processing transmission with the signals collecting of collector by cable input signal acquisition controlling, and data transmission and administrative section are analyzed by communication between slave computer and the host computer and upper computer software data.
Described sampling part comprises steam turbine oil master petroleum pipeline, oil transportation gear-type pump, on-line monitoring system oil-feed arm, buffering oil sump, moisture and temperature combination sensor, viscosity, density, specific inductive capacity, temperature four unification sensors, online particle contamination degree sensor; Wherein, monitoring system the steam turbine oil of monitoring in real time flow into the on-line monitoring system and flow back to from steam turbine oil master petroleum pipeline by on-line monitoring system oil-feed arm and on-line monitoring system oil returning branch pipe.In on-line monitoring system, steam turbine oil is divided into two-way, wherein one the road enters into the buffering oil sump, and other one the tunnel directly links to each other with online particle contamination degree sensor; The sensor of two fluid characteristics is installed in the buffering oil sump, and one is moisture and temperature combination sensor, and another is viscosity, density, specific inductive capacity, temperature four unification sensors; Moisture and temperature combination sensor are used for the size of MEASUREMENT OF STEAM turbine fluid water cut, viscosity, density, specific inductive capacity, temperature four unification sensors are used to measure the fluid behaviour parameter of steam turbine oil, are mainly used to monitor steam turbine oil viscosity, density and specific inductive capacity etc.
Described signals collecting control section comprises adc data capture card, gear-type pump, acoustic-optic alarm, hard disk and slave computer; The signal of moisture transducer output is a simulating signal, collect slave computer by the adc data capture card, viscosity, density, specific inductive capacity, temperature four unification sensors collect slave computer by the CAN2.0 interface, and the data of particle contamination degree sensor are input to slave computer by the RS232 serial line interface; Whether the slave computer basis is obtained the analysis result adjustment of sensor signal and the flow of control gear pump, and decide acoustic-optic alarm whether to carry out actuation of an alarm above preset threshold according to the steam turbine oil index of monitoring.
Described data transmission and administrative section, the sensor signal that slave computer is collected is transferred to host computer by computer network, and its database that deposits host computer in used for analyzing, show situation of change and the real time data of each sensor simultaneously in real time to the Monitoring Data of steam turbine oil.
In the data management software part, need judge the current data that collect, judge whether it has surpassed the service index of equipment requirements.Mainly judge by two aspects whether current data surpasses the desired index of equipment.Set the mean value threshold value on the one hand, set the real time data peak threshold on the other hand.The mean value threshold value is to judge whether the general trend of data variation has surpassed the operating index requirement of monitored steam turbine oil in measuring process repeatedly; What the real time data peak threshold reflected is the operating index the requirement whether current data variation amplitude of measuring surpasses monitored steam turbine oil, because the data of measuring can be the processes of a fluctuation in real time, the real time data peak threshold can guarantee that the peak value that fluctuates is no more than the requirement of operating index.In addition, data transmission and administrative section also will to each sensor acquisition to historical data analyze, from historical data, analyze the development trend that steam turbine oil changes, the user mode and the oil changing interval of prediction steam turbine oil.
The present invention can reach following beneficial effect after adopting technique scheme:
(1) realized steam turbine oil at on-line monitoring with oily characteristic.Overcome needs the steam turbine oil oil sample is got back to the complex process that the off-line assay is carried out in the laboratory in the past, directly goes out a cover monitoring arm from the working connection bypass, realizes the steam turbine oil on-line monitoring.
(2) realize the on-line measurement of steam turbine oil fluid property sensor by cushioning oil sump.The buffering oil sump has been expanded the diameter and the volume of fluid sampling arm effectively, can guarantee moisture, temperature and viscosity, density, specific inductive capacity, temperature four unification sensors are inserted in the Buffer Pool and measured well contacting with steam turbine oil, reduce the influence that measurement result is subjected to external environment and steam turbine oil flow characteristics in pipeline.
(3) adopt industrial single card microcomputer to realize collection, preservation and the transmission of sensor signal as slave computer.The industrial single card microcomputer stability that is adopted is fit to round-the-clock request for utilization, provides the multiple hardwares interface and to be kept in the hard disk the stable collection of sensing data.
(4) historical data in one week of preservation on slave computer.The industrial single card microcomputer job stability that slave computer adopts is very high, and host computer adopts ordinary PC, relatively easily break down, be the loss of data that prevents that host computer from breaking down and causing slave computer to be uploaded, the sensor signal of being gathered by slave computer in the nearly week all will back up in the hard disk of slave computer, and this data buffer is constantly refreshed.
(5) upper computer software can carry out analyzing and processing to the historical data that collects, and obtains the trend that the in use every index of steam turbine oil fluid changes, and the situation of prediction oil property to-be development.
Description of drawings
Fig. 1 is using steam turbine oil fluid state online auto monitoring system principle of work synoptic diagram for the present invention is a kind of;
Fig. 2 is using steam turbine oil fluid state online auto monitoring system sampling part structural representation for the present invention is a kind of;
Fig. 3 is a kind of at the signals collecting control section structural representation with steam turbine oil fluid state online auto monitoring system for the present invention;
Fig. 4 is using steam turbine oil fluid state online auto monitoring system data transmission and administrative section structure schematic flow sheet for the present invention is a kind of;
Fig. 5 is using steam turbine oil fluid state online auto monitoring system host computer data presentation software interface figure for the present invention is a kind of.
Embodiment
The mentality of designing of native system be by this system can real time on-line monitoring steam turbine oil viscosity, the variation of water percentage and particle contamination degree grade, when mean value threshold value of surpass setting when viscosity index, water-content indicator or particle contamination degree index or peak threshold, in time make sound and light alarm, the prompting field personnel takes measures to turbine oil system, prevents to cause steam turbine operational failure because of the turbo-engine lube characteristic variations.
The benefit analysis of native system: can monitor the conventional physical and chemical index of fluid in real time in process of production, the trend by data changes to be made record and analyzes the change procedure of fluid.The oil liquid monitoring project is all gathered in the collector mode, transmits by telecommunication cable with digital signal, does not have other loss in the whole process.In Central Control Room control desk centralized displaying, comprise real time data, trend map, fluid index variation warning after the comprehensive calculation process of data process.The variation that oil product in the operational process is occurred is reminded and is reported to the police, and according to the corresponding variation suggestion of handling it.By the accumulation of time and the analysis of data the variation of fluid physics and chemistry is made prediction, change oil, and the early stage improper friction phenomenon that occurs of equipment is made early warning thereby reach with matter.The accumulation of data also can concern the little change between all indexs of fluid to noting, by the analysis of data and the parsing of data chainning, can search the root of the chronic irregular change of some equipment oil products.
Further specify concrete technical scheme of the present invention below in conjunction with accompanying drawing.The general diameter of the conveyance conduit of steam turbine oil is thicker in the site environments such as generating plant, and still, the scene does not allow existing oil pipe is carried out processing processing such as perforate.Therefore, carry out mode that the on-line monitoring of fluid must be by arm and will be incorporated into the real-time monitoring that could realize in the Online Monitoring Control cabinet with oil in the oil pipe at the usefulness steam turbine oil.
Shown in Figure 1, using steam turbine oil fluid state online auto monitoring system principle of work synoptic diagram for the present invention is a kind of.Sampling part A is with the signals collecting of collector, carry out the signal Processing transmission by cable input signal acquisition controlling part B, data transmission and administrative section C analyze by communication between slave computer (14) and the host computer (15) and host computer (15) software data.
Shown in Figure 2, steam turbine oil master petroleum pipeline 1 is drawn on-line monitoring system oil-feed arm 3 and on-line monitoring system oil returning branch pipe 8 by two three-way pipes.Output terminal at two three-way pipes of steam turbine oil master petroleum pipeline 1 all respectively has a throttling valve, be used to turn-off the steam turbine oil that on-line monitoring system oil-feed arm 3 flow into on-line monitoring system oil returning branch pipe 8, be convenient to the operation of on-line monitoring system when more emat sensor is with maintenance.On-line monitoring system oil-feed arm 3 links to each other with oil transportation gear-type pump 2, and oil transportation gear-type pump 2 flows in on-line monitoring system and finally flow back into on-line monitoring system oil returning branch pipe 8 for steam turbine oil provides necessary pressure differential.Fluid to be measured is divided into two-way after entering on-line monitoring system, and one the tunnel enters buffering oil sump 4, a tunnel enters online particle contamination degree sensor 7.
The purpose that buffering oil sump 4 is set mainly contains two aspects and considers, first, fluid flowing velocity in the on-line monitoring system oil-feed arm 3 is bigger, can to should be the characteristic variations of liquid of flows through sensor too fast if sensor directly inserts on-line monitoring system oil-feed arm 3, and can not reflect the characteristic variations situation of tested steam turbine oil comprehensively, thereby buffering oil sump 4 is set can effectively cushions the fluid flowing velocity, make the measurement data of the sensor of buffering in the oil sump 4 more accurate; The second, on-line monitoring system oil-feed arm 3 calibers can not insert the bigger sensor of volume, thereby, provide a bigger oil storage space by buffering oil sump 4, can make things convenient for the layout of sensor and contact with the good of fluid.
Two kinds of fluid sensors are installed in the buffering oil sump 4 of on-line monitoring system of the present invention, and one is moisture and temperature combination sensor 5, and another is viscosity, density, specific inductive capacity, temperature four unification sensors 6.What moisture and temperature combination sensor 5 were exported is simulating signal, and wherein the moisture signal is voltage signal output, and measurement range is at 0-1000ppm; Temperature signal is the thermal resistance reflection that utilizes negative temperature coefficient, thereby can be that change in voltage calculates the relation between thermal resistance and the temperature with the thermal resistance shift conversion by external circuits.Therefore need by adc data capture card 9 collection of simulant signal of sensor to slave computer, specifically as shown in Figure 3.Viscosity, density, specific inductive capacity, temperature four unification sensors 6 have the digital signal interface of a compatible CAN2.0, four all monitoring parameters are all read and store into by the slave computer integrated circuit board in the hard disk of slave computer by the CAN2.0 bus, and its connection situation as shown in Figure 3.By the mode of perforate and processing screw hole on buffering oil sump 4, these two sensors are screwed into to be fixed in the hole on the buffering oil sump 4 fluid in the buffering oil sump 4 is monitored.
The online particle contamination degree of described fluid sensor 7 is by the RS232 serial ports granule number data in each particle diameter rate range to be exported, the RS232 serial ports of slave computer 14 is communicated by letter with online particle contamination degree sensor 7, the oil contamination degrees of data is read into storage in the slave computer 14, and then is uploaded to host computer 15.Simultaneously, possess digital display function on online particle contamination degree sensor 7 panels, can show the current contamination level of oil liquid class information that measures of sensor in real time.
Shown among Fig. 3 is collecting sensor signal transmission of the present invention and control structure synoptic diagram.Slave computer 14 comprises CPU, internal memory, hard disk 12 each, have six USB2.0 interfaces, ten of RS232 serial line interfaces, the compatible RS485 interface of part serial line interface wherein, the CAN2.0 interface on the slave computer 14 is realized by the interface card that a RS232 changes CAN2.0.Be connected by USB interface between adc data capture card 9 and the slave computer 14 and realize data transmission and control function.In addition, slave computer 14 is used to control two performance elements, and one is that 10, one of gear-type pumps are acoustic-optic alarms 11.Wherein, the controller of gear-type pump 10 is connected with slave computer 14 by RS232, and slave computer 14 will be transferred to the gear-type pump controller by the RS232 interface to the setting data of gear-type pump flow velocity; After on-line monitoring system detected some index of fluid and surpasses setting threshold, slave computer 14 drove acoustic-optic alarms 11 and sends that the sound and light alarm signal prompt is current a fluid index exceeding standard, needs to pay close attention to oil system and also takes some measures.
Fig. 4 is data transmission and administrative section data stream and structure flow chart.Reflected that in detail whole upper computer software and slave computer software by the streams data situation that network interface carries out data transmission and control, have illustrated the workflow that upper computer software is communicated by letter with slave computer simultaneously.The concrete function of upper computer software is described below:
(1), server software and hardware sensor data communication mechanism: adopt heartbeat packet, hardware sensor (slave computer 14) is duration announcement server (host computer 15) self presence fixedly.After host computer 15 responded successfully, slave computer 14 sent sensing data.And returning the raw data that slave computer 14 is gathered, the result after the server end formula calculates is used for slave computer 14 screens and shows.
(2), control in real time: host computer 15 is the duty of control slave computer 14 in real time, and slave computer provides function, mechanism to be called control slave computer 14 duties and abnormal alarm by host computer 15.
(3), original data storage: after slave computer 14 raw data that receive are unpacked, directly deposit database in, for the later reference counterfoil.
(4), formula substitution: after the raw data of reading database, behind the substitution formula, be presented in the interface, foreground.The computing basic operation comprises: addition subtraction multiplication and division arithmetic, square evolution logarithm etc., different pieces of information item algorithm difference.
(5), display mode: display mode shows according to the odd-numbered day trend map, reflects that promptly real time data reflects odd-numbered day data variation trend again.
(6), abnormal alarm: every data item field is provided with the critical setting of dual warning: 1. data bound interval; 2. data average value ranges interval.Concrete scope is provided with by the user, reports to the police when triggering wherein each.
(7), data sheet: every item number is according to establishing the trend map form, and the time range interval is selected by the user.Report data should be formula substitution data processed but not raw data form.
(8), raw data is encrypted: after raw data is read by sensor device, press user-defined format and encrypt storage.
(9), raw data derives: design data derives authority module, by the user authority is set, and derives respective field.
(10), Operation Log: host computer 15 writes down the general operation daily records, as switchgear operation person, time, the projects such as operation, data exception of doing.
Fig. 5 is a host computer data presentation software interface.The function that upper computer software is mainly realized is: the data transmission of each sensor of slave computer 14 being gathered by computer network is to host computer 15, Time of Day that all data is comprised data acquisition etc. all is saved in the database of host computer 15, the curve map of while variation tendency of every monitoring index (viscosity, density, temperature, specific inductive capacity) of demonstration steam turbine oil on host computer 15 interfaces, as shown in Figure 5.In addition, moisture and the oil contamination degrees of data that monitors for moisture and temperature combination sensor 5 and online particle contamination degree sensor 7 also can utilize curve map to show its variation tendency in software interface.All trend map curves all show the same day from 0 o'clock to 24 o'clock changing trend diagram, for historical data, can transfer from database then per diem, by week or monthly show.By grasping the time dependent situation of steam turbine oil characteristic to the analysis of historical data.
Claims (2)
1. one kind with steam turbine oil fluid state online auto monitoring system, comprising: sampling part (A), signals collecting control section (B), data transmission and administrative section (C); It is characterized in that: sampling part (A) is carried out the signal Processing transmission with the signals collecting of collector by cable input signal acquisition controlling part (B); Data transmission and administrative section (C) are analyzed by communication between slave computer (14) and the host computer (15) and host computer (15) software data; Sampling part (A) comprises steam turbine oil master petroleum pipeline (1), oil transportation gear-type pump (2), on-line monitoring system oil-feed arm (3), buffering oil sump (4), moisture and temperature combination sensor (5), viscosity, density, specific inductive capacity, temperature four unification sensors (6), online particle contamination degree sensor (7); Wherein, monitoring system the steam turbine oil of monitoring in real time flow into the on-line monitoring system and flow back to from steam turbine oil master petroleum pipeline by on-line monitoring system oil-feed arm (3) and on-line monitoring system oil returning branch pipe (8); In on-line monitoring system, steam turbine oil is divided into two-way, wherein one the road enters into buffering oil sump (4), and other one the tunnel directly links to each other with online particle contamination degree sensor (7); The sensor of two fluid characteristics is installed in buffering oil sump (4), and one is moisture and temperature combination sensor (5), and another is viscosity, density, specific inductive capacity, temperature four unification sensors (6).
2. according to claim 1 a kind of at usefulness steam turbine oil fluid state online auto monitoring system, it is characterized in that: signals collecting control section (B) comprises adc data capture card (9), gear-type pump (10), acoustic-optic alarm (11), hard disk (12) and slave computer (14); The signal of moisture transducer (5) output is a simulating signal, collect slave computer (14) by adc data capture card (9), viscosity, density, specific inductive capacity, temperature four unification sensors (6) collect slave computer (14) by the CAN2.0 interface, and the data of particle contamination degree sensor (7) are input to slave computer (14) by the RS232 serial line interface; Whether slave computer (14) basis is obtained the analysis result adjustment of sensor signal and the flow of control gear pump (10), and decide acoustic-optic alarm (11) whether to carry out actuation of an alarm above preset threshold according to the steam turbine oil index of monitoring; In data transmission and the administrative section (C), the sensor signal that slave computer (14) is collected is transferred to host computer (15) by computer network, and its database that deposits host computer (15) in used for analyzing, show situation of change and the real time data of each sensor simultaneously in real time to the Monitoring Data of steam turbine oil.
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| CN102721821A (en) | 2012-10-10 |
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