CN204477704U - A kind of thermal power station modulating valve real-time online Cavitation detection early warning system - Google Patents
A kind of thermal power station modulating valve real-time online Cavitation detection early warning system Download PDFInfo
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- CN204477704U CN204477704U CN201520108556.2U CN201520108556U CN204477704U CN 204477704 U CN204477704 U CN 204477704U CN 201520108556 U CN201520108556 U CN 201520108556U CN 204477704 U CN204477704 U CN 204477704U
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- modulating valve
- power station
- pressure sensor
- monitoring objective
- pipeline
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Abstract
A kind of thermal power station modulating valve real-time online Cavitation detection early warning system, this system comprises the external monitoring unit, monitoring objective modulating valve, pipeline flow sensor, modulating valve upstream temperature sensor, modulating valve upstream pressure sensor and the modulating valve downstream pressure sensor that are connected with power station DCS control system; The standard industry MODBUS serial ports supported by conventional power plant DCS between external monitoring unit and power station DCS control system carries out both-way communication, receive the measurement signal of pipeline flow sensor, modulating valve upstream temperature sensor, modulating valve upstream pressure sensor and the modulating valve downstream pressure sensor sent from power station DCS control system, and modulating valve cavitation check result is sent to power station DCS control system, utilize the built-in warning of power station DCS control system and reminding module can send prompting and report to the police, prompting operations staff; To the equipment Management Level improving thermal power plant, extend the key equipment life-span, reduce maintenance and repair cost and all have great importance.
Description
Technical field
The utility model relates to thermal power station's automatic control technology field, is specifically related to a kind of thermal power station modulating valve real-time online Cavitation detection early warning system.
Background technique
Modulating valve is one of modal industry equipment, and application area is very extensive.Cavitation (cavitation erosion) is one of principal element that modulating valve damages, and is also the content that system design stage carries out valve selection and must check.The cavitation (cavitation erosion) of valve be liquid working substance flow through valve the narrowest reducing time, the increase of local velocity makes pressure decline fast, now as local compression is less than the saturation pressure of working medium, then liquid working substance is understood transient evaporation and is produced a large amount of bubbles, when working medium is further towards in the process of output flow, along with the increase of flow area, flow velocity reduces gradually, pressure is also recovered, now under the effect of hyperbaric environment, bubble moment vanishes again, causes great impact, causes serious destruction to equipment.
Thermal power station is classical large complicated industrial system, according to the characteristic of electrical network, thermal power station need frequently according to network load demand adjustment operating mode with the balance of satisfied power supply and electricity consumption, a large amount of modulating valve therefore must be needed in start and stop and load adjustment process to meet the needs of manufacturing process; In addition, because thermal power station is cycle fluid with water, rely on working medium evaporation of water, condensation phase transition process in manufacturing process, therefore, a large amount of modulating valve faces the risk of cavitation in the course of the work.
Prior art mainly adopts two class technology for valve cavitation erosion problem, the first kind belongs to architecture advances technology, the destruction of even eliminating cavitation erosion and producing is alleviated by the improvement of various valve mechanism, Equations of The Second Kind belongs to type selecting and arranges check, the related data that designer provides according to the design work condition of valve and valve producer, check valve and whether under design conditions, possess enough cavitation erosion margin of safety, thus carry out layout design and the type selecting of valve.
The architecture advances technology of valve is of a great variety, but all needs increase extra parts or carry out the structural modification of valve body, and demand is low compared with traditional valve, and design, manufacture cost are higher, therefore, except very special occasions, in electric power station system, rarely has employing.
System design stage carries out the safe check of cavitation erosion for valve and layout design is the work that Power Plant Design must be carried out, and generally according to the relevant parameter that valve producer provides, whether the pressure drop of checking design conditions lower valve meets the requirement of relevant criterion.At present, the appraisal procedure of valve manufacturer to cavitation is not quite similar, and common method mainly contains KE method, δ method and XFz method, mainly for how to avoid cavitation, thus carries out correct type selecting to valve.
The design conditions of valve system generally select declared working condition, thus instruct valve to carry out type selecting to ensure that enough flows meet system process requirement.But real system in the course of the work, start and stop and frequently load adjustment make the actual operating conditions change of valve greatly, and usually off-design operating mode is comparatively far away, and this makes the cavitation erosion calculation and check of conventional design phase that actual valve working procedure cannot be avoided to occur cavitation erosion.A large amount of electric power station system valve repair and maintenance experience shows, although the valve selection in electric power station system design process has all carried out cavitating checking, but real system usually causes valve to run on bad working environments in start and stop and frequent load adjustment process, this causes the cavitation erosion of valve to be still the main cause of electric power station system inner valve damage.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the purpose of this utility model is to provide a kind of thermal power station modulating valve real-time online Cavitation detection early warning system, to the equipment Management Level improving thermal power plant, extend the key equipment life-span, reduce maintenance and repair cost and all have great importance.
For reaching above object, the utility model adopts following technological scheme:
A kind of thermal power station modulating valve real-time online Cavitation detection early warning system, comprises the external monitoring unit 11, monitoring objective modulating valve 6, pipeline flow sensor 2, modulating valve upstream temperature sensor 3, modulating valve upstream pressure sensor 4 and the modulating valve downstream pressure sensor 8 that are connected with power station DCS control system 10; Described modulating valve upstream temperature sensor 3 and modulating valve upstream pressure sensor 4 are the nearest pressure and temperature measuring transducer of monitoring objective modulating valve 6 place line upstream distance monitoring objective modulating valve 6; Modulating valve downstream pressure sensor 8 is the nearest pressure transducer of monitoring objective modulating valve 6 place pipe line downstream distance monitoring objective modulating valve 6; Pipeline between described monitoring objective modulating valve 6 and modulating valve upstream pressure sensor 4 and pipeline parts form modulating valve upstream pipeline section 5, and the pipeline between described monitoring objective modulating valve 6 and modulating valve downstream pressure sensor 8 and pipeline parts form modulating valve downstream pipeline section 7.
In the upstream line 1 that described pipeline flow sensor 2 is positioned at monitoring objective modulating valve 6 or downstream line 9, only need ensure that institute's measurement of discharge equals or is approximately equal to the flow by monitoring objective modulating valve 6.
Described external monitoring unit 11 selects to be furnished with respective operation system and the programmable controller PLC of supporting industry standard MODBUB serial communication, industrial control computer, microcomputer or server.
Compared to the prior art comparatively, the utility model possesses following advantage:
In thermal power station's system original for the production of process-monitor with control to need and install pipeline pressure, fluid temperature (F.T.), pipeline flow sensor, according to the sensor output signal composition system that the System's composition structure choice that the utility model proposes is corresponding, the cavitation risk of real time on-line monitoring modulating valve.In Unit Commitment and load adjustment process, utilize the original prompting of machine set system and warning function interface, the risk of each modulating valve generation cavitation is pointed out and reported to the police, can be used for reminding the method for operation of operations staff adjust system and lifting load speed etc., thus alleviate the Cavitation even avoiding modulating valve, can assist for the valve often damaged and confirm whether cavitation damage is main inducing, instruct maintenance and the transformation of power plant, this is to the equipment Management Level improving thermal power plant, extend the key equipment life-span, reduce maintenance and repair cost all to have great importance.
Compared with prior art, feature of the present utility model is as follows: (1) only need increase external monitoring unit 11 on existing thermal power station's system hardware structure basis, can realize carrying out real time on-line monitoring to valves that there is cavitation risk all in power station, without the need to increasing any hardware and sensor, realize cost low; (2) system hardware and original power station DCS system one integrated mass, the prompting that direct use DCS system is intrinsic or warning function module, meet the integrated requirement of operations staff for full factory operation control system, original unified platform can realize the monitoring function to valve cavitation; (3) even if the simplest valve can adopt technology of the present utility model realize monitoring and report to the police, complexity and the optional equipment of equipment itself is not relied on; (4) different from existing design & check method, the modulating valve Cavitation detection alarm method that the utility model proposes can obtain modulating valve cavitation risk indicator, the height of risk indicator can not only illustrate the risk that cavitation occurs, the degree that cavitation occurs also can be described, and then the destructiveness described regulating valve device, monitoring operations staff being carried out to equipment running status has more Practical significance, and the former can only provide the cavitation analysis possessing certain margin of safety, the adequate condition that cavitation does not occur valve can only be checked, limited to the prompting meaning of operations staff.
Accompanying drawing explanation
Accompanying drawing is the utility model system architecture schematic diagram.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in drawings, a kind of thermal power station of the utility model modulating valve real-time online Cavitation detection early warning system, comprises the external monitoring unit 11, monitoring objective modulating valve 6, pipeline flow sensor 2, modulating valve upstream temperature sensor 3, modulating valve upstream pressure sensor 4 and the modulating valve downstream pressure sensor 8 that are connected with power station DCS control system 10; Described modulating valve upstream temperature sensor 3 and modulating valve upstream pressure sensor 4 are the nearest pressure and temperature measuring transducer of monitoring objective modulating valve 6 place line upstream distance monitoring objective modulating valve 6; Modulating valve downstream pressure sensor 8 is the nearest pressure transducer of monitoring objective modulating valve 6 place pipe line downstream distance monitoring objective modulating valve 6; Pipeline between described monitoring objective modulating valve 6 and modulating valve upstream pressure sensor 4 and pipeline parts form modulating valve upstream pipeline section 5, and the pipeline between described monitoring objective modulating valve 6 and modulating valve downstream pressure sensor 8 and pipeline parts form modulating valve downstream pipeline section 7; The standard industry MODBUS serial ports supported by conventional power plant DCS between external monitoring unit 11 and power station DCS control system 10 carries out both-way communication, receive the measurement signal of pipeline flow sensor 2, modulating valve upstream temperature sensor 3, modulating valve upstream pressure sensor 4 and the modulating valve downstream pressure sensor 8 sent from power station DCS control system 10, and modulating valve cavitation check result is sent to power station DCS control system 10, utilize the built-in warning of power station DCS control system 10 and reminding module can send prompting and report to the police, prompting operations staff.
As preferred implementation of the present utility model, described pipeline flow sensor 2 be positioned at the upstream line 1 of monitoring objective modulating valve 6 or downstream line 9 all can, only need ensure that institute's measurement of discharge equals or is approximately equal to the flow by monitoring objective modulating valve 6.
As preferred implementation of the present utility model, described external monitoring unit 11 selects to be furnished with respective operation system and programmable controller PLC, industrial control computer, microcomputer or the server of supporting industry standard MODBUB serial communication (installation code MODBUS address card or installation code MODBUS communication program software).In addition, external monitoring unit 11 adopts a kind of thermal power station modulating valve real-time online cavitation method for early warning that the utility model proposes to carry out the calculating of cavitation risk factor λ, and result of calculation and alarm signal are passed to power station DCS control system 10.
External monitoring unit 11 can select to be furnished with the programmable controller (PLC) of respective operation system, industrial control computer (process control machine), microcomputer or server, and these units are supporting industry standard MODBUB serial communication (installation code MODBUS address card or installation code MODBUS communication program software) all.In addition, external monitoring unit 11 also needs standard pipe hydraulic resistance computer program and the valve cavitation nucleus correcting program of installing the respective system of support, these two kinds of programs (it is a program that above-mentioned two kinds of functions combine by some program product) Shi Ge designing institute carries out the Kinds of Essential Software of ductwork design, follow relevant international standard or domestic standard, and have the business software being widely used in different platform environment can for choosing.For clearly demonstrating the relation between the software program of installation and hardware system, to install hydraulic resistance calculating and valve cavitation checks two computer program softwares, general standard adjustment valve cavitation is checked flow process and is summarized as follows: using the structural parameter of the pressure signal of modulating valve upstream pressure sensor 4 and modulating valve upstream pipeline section 5 as input, by hydraulic resistance computer program exportable monitoring objective modulating valve 6 inlet pressure p
in; Using the structural parameter of the pressure signal of modulating valve downstream pressure sensor 8 and modulating valve downstream pipeline section 7 as input, calculate exportable monitoring objective modulating valve 6 outlet pressure p by hydraulic resistance
out; Monitoring objective modulating valve 6 inlet pressure p
inwith outlet pressure p
outas the input of valve cavitation nucleus correcting program, cavitation check can be carried out to monitoring objective modulating valve 6 and export the result whether meeting cavitation checking conditions; The nucleus correcting program that two functions are united two into one directly using the structural parameter of the structural parameter of the pressure signal of the pressure signal of modulating valve upstream pressure sensor 4, modulating valve downstream pressure sensor 8, monitoring upstream pipeline section 5, monitoring downstream pipeline section 7 as input, cavitation check can be carried out to monitoring objective modulating valve 6 and export the result whether meeting cavitation checking conditions.
Claims (3)
1. thermal power station's modulating valve real-time online Cavitation detection early warning system, is characterized in that: comprise the external monitoring unit (11), monitoring objective modulating valve (6), pipeline flow sensor (2), modulating valve upstream temperature sensor (3), modulating valve upstream pressure sensor (4) and the modulating valve downstream pressure sensor (8) that are connected with power station DCS control system (10); Described modulating valve upstream temperature sensor (3) and modulating valve upstream pressure sensor (4) are the nearest pressure and temperature measuring transducer of monitoring objective modulating valve (6) place line upstream distance monitoring objective modulating valve (6); Modulating valve downstream pressure sensor (8) is monitoring objective modulating valve (6) place pipe line downstream distance monitoring objective modulating valve (6) nearest pressure transducer; Pipeline between described monitoring objective modulating valve (6) and modulating valve upstream pressure sensor (4) and pipeline parts form modulating valve upstream pipeline section (5), and the pipeline between described monitoring objective modulating valve (6) and modulating valve downstream pressure sensor (8) and pipeline parts form modulating valve downstream pipeline section (7).
2. a kind of thermal power station according to claim 1 modulating valve real-time online Cavitation detection early warning system, it is characterized in that: in the upstream line (1) that described pipeline flow sensor (2) is positioned at monitoring objective modulating valve (6) or downstream line (9), only need ensure that institute's measurement of discharge equals or is approximately equal to the flow by monitoring objective modulating valve (6).
3. a kind of thermal power station according to claim 1 modulating valve real-time online Cavitation detection early warning system, is characterized in that: the selection of described external monitoring unit (11) is furnished with respective operation system and the programmable controller PLC of supporting industry standard MODBUB serial communication, industrial control computer, microcomputer or server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520108556.2U CN204477704U (en) | 2015-02-14 | 2015-02-14 | A kind of thermal power station modulating valve real-time online Cavitation detection early warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520108556.2U CN204477704U (en) | 2015-02-14 | 2015-02-14 | A kind of thermal power station modulating valve real-time online Cavitation detection early warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204477704U true CN204477704U (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520108556.2U Expired - Fee Related CN204477704U (en) | 2015-02-14 | 2015-02-14 | A kind of thermal power station modulating valve real-time online Cavitation detection early warning system |
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| CN (1) | CN204477704U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108197810A (en) * | 2018-01-02 | 2018-06-22 | 苏州西热节能环保技术有限公司 | A kind of Power Plants valve operation management method |
| CN113485213A (en) * | 2021-07-05 | 2021-10-08 | 北京瑞博众成科技有限公司 | Intelligent real-time monitoring system for digital twin regulating valve |
-
2015
- 2015-02-14 CN CN201520108556.2U patent/CN204477704U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108197810A (en) * | 2018-01-02 | 2018-06-22 | 苏州西热节能环保技术有限公司 | A kind of Power Plants valve operation management method |
| CN108197810B (en) * | 2018-01-02 | 2022-02-22 | 苏州西热节能环保技术有限公司 | Whole-plant valve operation management method for power plant |
| CN113485213A (en) * | 2021-07-05 | 2021-10-08 | 北京瑞博众成科技有限公司 | Intelligent real-time monitoring system for digital twin regulating valve |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20200214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |