CN101901007B - Compressed air measuring and controlling system and method for power plant instrument - Google Patents
Compressed air measuring and controlling system and method for power plant instrument Download PDFInfo
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- CN101901007B CN101901007B CN201010224967XA CN201010224967A CN101901007B CN 101901007 B CN101901007 B CN 101901007B CN 201010224967X A CN201010224967X A CN 201010224967XA CN 201010224967 A CN201010224967 A CN 201010224967A CN 101901007 B CN101901007 B CN 101901007B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims description 29
- 238000010926 purge Methods 0.000 claims description 17
- 230000006837 decompression Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract 2
- 238000010408 sweeping Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004452 microanalysis Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to compressed air measuring and controlling system and method for a power plant instrument. The compressed air measuring and controlling system can effectively monitor compressed air so that and the pneumatic equipment in a power plant acts more reliably and timely. The compressed air measuring and controlling system comprises an air storage tank, wherein the air storage tank is connected with a measuring loop, a sweeping loop is connected between the air storage tank and the measuring loop, the measuring loop is provided with a pressure control loop, the tail end of the pressure control loop is connected with a third needle valve, the sweeping loop comprises a reducing valve, a first needle valve and an oil and water filtering device which are sequentially connected, the reducing valve is connected with the air storage tank, the oil and water filtering device is connected with the pressure control loop, and the devices are connected with a decentralized control system.
Description
Technical field
The present invention relates to a kind of power plant instrument with pressurized air TT&C system and method thereof.
Background technology
As one of power plant's power, pressurized air and electric power have status of equal importance.Therefore but appearance is but often out in the cold with compressed-air actuated quality monitoring, and causes appearance to descend with compressed air quality, pneumatic actuator tripping and the accident that jeopardizes unit safety operation happens occasionally.
In the electricity power enterprise; Appearance is the strong inspection project (" fuel-burning power plant Thermal Automation system overhaul operating standard " DL/T774-2004-7.1.2.3.3f bar) during the thermal technology supervises with the humidity in the pressurized air; Be guarantee security of system stable the index (GB/T13277-91 " generally using the compressed air quality grade ") that must control; But but the at present domestic monitoring means that still is not applicable to on-the-spot on-line monitoring appearance with compressed air quality is brought very big difficulty to technological supervision work.
Appearance mainly comprises three aspects with the compressed air quality monitoring: humidity, oil content and solids etc.The principal element that causes power plant's pneumatic actuator tripping is that the pressurized air dew point is too high, and just moisture exceeds standard in the pressurized air.Cause power plant instrument with the principal element of pressurized air Moisture high UCL to be: sorbing material lost efficacy or expired, adsorber regeneration device heating-up temperature does not reach and requires or exhaust is smooth, the influence of environment temperature, poorly sealed etc.
The GB_T_4830:1984 regulation:
Pressurized air dew point testing method: with precision be not less than ± the water microanalysis appearance of 10% (ppmv value) measures, the gained data convert by relevant formula (curve or form).The gained dew point will be lower than 10 ℃ of local limit minimum temperatures.
Explain among the ISO 8573-3:1999:
| Measuring method | Measurement range | Measuring accuracy | The pressure requirement | Working temperature | Antijamming capability |
| Minute surface method (manual work) | -20℃～+25℃ | 0.2～1℃ | 0～200bar | 0℃～50℃ | Difference |
| Minute surface method (electronics) | -80℃～+25℃ | 0.2～1℃ | 0～200bar | 0℃～50℃ | Difference |
| Chemical reaction (variable color) | -65℃～+35 |
1～2℃ | Atmospheric pressure | 0℃～40℃ | Generally |
| Condenser type | -80℃～+40 |
2～5℃ | 0～20bar | -30℃～+50℃ | Generally |
| Electrolysis (conductance) | -40℃～+25 |
2～5℃ | 0～20bar | -30℃～+50℃ | Generally |
| Resistance-type | -40℃～+25 |
2～5℃ | 0～20bar | 0℃～50℃ | Generally |
| Wet and dry bulb | 5%～100% | 2～5℃ | Atmospheric pressure | 0℃～100℃ | Difference |
Also stipulate among the ISO: when carrying out the micro-moisture measurement, reduce to normal pressure as far as possible, and keep gas fixing flow and pressure; To make simultaneously and not contain materials such as aqueous water, oil, dust in the seized gas.
1 traditional humidity detection method can not satisfy the detection requirement of power plant instrument with the ultralow humidity of pressurized air.
The ultralow humidity detection method of 2 existing air mainly contains condenser type water analyzer, electrolytic water analyzer, piezoelectric quartz crystal Moisture Meter etc., and its range of application is confined to the not detection of the atmosphere gas of oil-containing, dust.
The micro-moisture analysis is having very vital role in 3 gases aspect production and the scientific research, and the water analysis appearance is various in style, but total saying receives the influence of many factors, uses Moisture Meter stable, and measurement result is accurate, also has many difficulties.Overcome ambient humidity and disturb, accurately, fast, sensitive flow process control, the application of water quality standard material etc. improve perfect when needing further effort.
But 4 do not have a cover to adapt to the on-line monitoring, sampling, analyser of the rig-site utilization device with compressed air quality as yet.
To the regulation among GB and the ISO, consider the actual state of power plant's compressed air quality, mainly there is following difficult point in the pressurized air humidity detection:
What will carry out is the measurement of ultralow humidity, it is very high to measure schedule requirement, the current measuring methods antijamming capability is general.
2. there are influence in oleaginousness and dust to measuring accuracy in the pressurized air, and there is harm in measurement mechanism.
3. the compressed-air actuated working pressure of power plant is generally 0.6-0.8Mpa, reduces its pressure and measures the progress that can improve measurement, and reduction pressure is measured its measurement result of back and will be changed.
4. the moisture that delivery line absorbed will blow down totally, otherwise measurement result is had very big influence.
5. measurement mechanism has very high requirement for pressure flow stable.
6. measurement mechanism and pipeline are very high to sealing requirements.
7. measure the selection of loop caliber material and area.
8. the verification of measurement mechanism.
Summary of the invention
The object of the invention is exactly in order to address the above problem, and provides a kind of power plant instrument with pressurized air TT&C system and method thereof, and it can effectively be monitored pressurized air, makes the action of power plant's pneumatic equipment reliable more, timely.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of power plant instrument is used the pressurized air TT&C system, and it comprises gas-holder, gas-holder with measure the loop and be connected, also be connected purge circuit between gas-holder and measurement loop simultaneously; Wherein, measure the loop and be provided with pressure control loop, pressure control loop is terminal to be connected with the 3rd needle valve; Said purge circuit comprises reduction valve, first needle valve and the oil strain water treatment plant that connects successively, and reduction valve is connected with gas-holder; The oil strain water treatment plant is connected with pressure control loop; Said each equipment all is connected with scattered control system.
Said gas-holder is provided with drain solenoid valve, temperature transmitter and pressure unit.
The pipeline in said measurement loop selects for use hydrophobic material to process.
The pipeline in said measurement loop is the stainless-steel tube of interior polishing.
Said pressure control loop comprises decompression valve, second needle valve, pick-up unit and the tensimeter that connects successively, and second needle valve is connected with the oil strain water treatment plant, and tensimeter is connected with the 3rd needle valve.
A kind of power plant instrument is with the investigating method of pressurized air TT&C system, and its step is:
1) sends instruction from scattered control system, open reduction valve, first needle valve, second needle valve, the 3rd needle valve successively, purge measuring pipeline;
2) purge to setting-up time, send instruction from scattered control system and close reduction valve, first needle valve successively;
3) after first needle valve was closed, the pressure control loop of scattered control system dropped into automatically, and the aperture of control decompression valve makes pressure remain on setting value;
4) after pressure control loop is devoted oneself to work setting-up time, pick-up unit is placed detecting position; The signal that pick-up unit is measured is delivered to scattered control system; Tensimeter, pressure unit are delivered to scattered control system with measured measuring channel pressure P 1, air tank pressure P 2; Scattered control system is according to measuring channel pressure P 1; Air tank pressure P 2 and dew point measured value t utilize formula
, and the dew point calculated value T of air tank is tried to achieve in computing;
5) scattered control system is tried to achieve the dew point calculated value T of air tank with computing, and the compressed air temperature of the gas-holder that records with temperature transmitter compares, and deviation is promptly sent alerting signal less than 15 ℃; Deviation is less than 10 ℃, and scattered control system is promptly sent the instruction unpack drain solenoid valve, carries out draining;
6) pick-up unit is placed stop to measure the position;
7) be 0 from scattered control system with the set of decompression valve aperture;
8) send instruction from scattered control system and close the 3rd needle valve, second needle type regulating valve successively;
9) like the need draining, behind the draining setting-up time, scattered control system is sent the order fulfillment draining.
The present invention measures the influence of moisture residual in the pipeline for measurement result for reducing, and need purge measuring pipeline.If directly purge with tested gas; The oil that is contained in the tested gas, dust etc.; Will work the mischief and influence the precision of measurement measurement mechanism, for this reason, design uses the tested gas through the device of filter oil, drainage to purge measuring the loop in the scheme.And purging adjustable in pressure.In measuring the loop, also be designed with pressure control device, the caliber area of selecting suitable measurement loop through Theoretical Calculation simultaneously is to satisfy the pressure flow requirement of measurement mechanism to tested gas.Measure the pipeline in loop and select hydrophobic material for use, be advisable with the stainless-steel tube of interior polishing.
Afterbody measuring pipeline is designed with needle valve, can it be played a protective role in that environment temperature is higher when stopping using measurement mechanism, thereby prolongs serviceable life of measurement mechanism.
Can use DCS (scattered control system) to accomplish the calculating and the analysis of measurement result, the automatic control function that realization is measured, and warning and interlock protection function make the action of power plant's pneumatic equipment reliable more, timely.
Stipulate according to GB_T_4830:1984: pressurized air dew point testing method:
With precision be not less than ± the water microanalysis appearance of 10% (ppmv value) measures, the gained data convert by relevant formula (curve or form).
The gained dew point will be lower than 10 ℃ of local limit minimum temperatures.
Utilize DCS (scattered control system) strong calculation function, to 9: dew points at normal pressure (4-20mA) signal that pick-up unit is measured, carry out the pressure conversion; Obtain the pressure leak source of gas-holder; And compare with the compressed air temperature of gas-holder, deviation is promptly sent alerting signal less than 15 ℃; Deviation promptly starts 12: drain solenoid valve less than 10 ℃.In DCS, be designed with a cover and measure the pressure regulation circuit of pipeline, through regulating 7: decompression valve, to guarantee to measure needed gaseous tension.
The invention has the beneficial effects as follows: make full use of DCS (scattered control system) powerful calculating and control ability; Realize measurement and the control of power plant instrument with pressurized air humidity; For preventing power plant's pneumatic actuator tripping; The security of operation that guarantees unit is significant, adopts the industry of pneumatic actuator that the place of reference is arranged for other.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Wherein, 1. gas-holder, 2. temperature transmitter, 3. reduction valve, 4. first needle valve, 5. oil strain water treatment plant, 6. pressure unit, 7. decompression valve, 8. second needle valve, 9. pick-up unit, 10. tensimeter, 11. the 3rd needle valves, 12. drain solenoid valves.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1, it comprises gas-holder 1, gas-holder 1 with measure the loop and be connected, also be connected purge circuit between gas-holder 1 and measurement loop simultaneously.
Measure the loop and be provided with decompression valve 7, second needle valve 8, pick-up unit 9, tensimeter 10 and the 3rd terminal needle valve 11 successively, decompression valve 7 is connected with gas-holder 1;
Purge circuit then comprises reduction valve 3, first needle valve 4 and the oil strain water treatment plant 5 that connects successively, and reduction valve 3 is connected with gas-holder 1; Oil strain water treatment plant 5 is connected with second needle valve 8.
Gas-holder 1 is provided with drain solenoid valve 12, temperature transmitter 2 and pressure unit 6.
Measure the pipeline in loop and select for use hydrophobic material to process, for example the stainless-steel tube of interior polishing.
Method of the present invention is:
1, sends instruction (1-5V) from scattered control system and open 3,4,8,11 successively, purge measuring pipeline.
2, purge after 10 minutes, send instruction (1-5V) from scattered control system and close 3,4 successively.
3,4 close after, scattered control system is automatic with the pressure control loop input, pressure set points is 0.1MPa, pressure control loop sends instruction (4-20mA), control 7 aperture.
4, the pressure control loop input places detecting position with 9 after automatic 3 minutes.
9 measured signals (4-20mA) are delivered to scattered control system.10,6 with measured measuring channel pressure (relative pressure, promptly with respect to the pressure of atmosphere, below all with) P1, air tank pressure (relative pressure) P2 (4-20mA) deliver to scattered control system.
Scattered control system is utilized above-mentioned formula according to measuring channel pressure P 1 (relative pressure), air tank pressure (relative pressure) P2 and dew point measured value t, and the dew point calculated value T of air tank is tried to achieve in computing.
5, scattered control system is tried to achieve the dew point calculated value T of air tank with computing, compares with the compressed air temperature of 2 gas-holder that record, and deviation is promptly sent alerting signal less than 15 ℃; Deviation is less than 10 ℃, and scattered control system is promptly sent instruction (1-5V) and started drain solenoid valve.
6, place 9 and stop to measure the position.
7, from scattered control system pressure control loop being cut manually, is 0 with 7 aperture set.
8, send instruction (1-5V) from scattered control system and close 11,8 successively.
9, like the need draining, start drain solenoid valve after 5 minutes, scattered control system is sent instruction (1-5V) and is closed drain solenoid valve.
In the dew point computing formula,
P1: measuring channel pressure (relative pressure)
P2: air tank pressure (relative pressure)
Pv1: measuring channel water in air vapor partial pressure power
Pv2: air tank water in air vapor partial pressure power
T: dew point measured value
T: dew point calculated value
X: intermediate variable, represent ln (Pv1*P2/P1)
When-60 ℃ t 0 ℃ the time,
;
When 0 ℃ t 70 ℃ the time,
.
During as
,
Claims (6)
1. a power plant instrument is used the pressurized air TT&C system, it is characterized in that it comprises gas-holder, gas-holder with measure the loop and be connected, also be connected purge circuit between gas-holder and measurement loop simultaneously; Wherein, measure the loop and be provided with pressure control loop, pressure control loop is terminal to be connected with the 3rd needle valve; Said purge circuit comprises reduction valve, first needle valve and the oil strain water treatment plant that connects successively, and reduction valve is connected with gas-holder; The oil strain water treatment plant is connected with pressure control loop; Described gas-holder, the 3rd needle valve, reduction valve, first needle valve, oil strain water treatment plant, measurement loop, purge circuit, pressure control loop all are connected with scattered control system.
2. power plant instrument as claimed in claim 1 is used the pressurized air TT&C system, it is characterized in that, said gas-holder is provided with drain solenoid valve, temperature transmitter and pressure unit.
3. power plant instrument as claimed in claim 1 is used the pressurized air TT&C system, it is characterized in that, the pipeline in said measurement loop selects for use hydrophobic material to process.
4. power plant instrument as claimed in claim 3 is used the pressurized air TT&C system, it is characterized in that, the pipeline in said measurement loop is the stainless-steel tube of interior polishing.
5. power plant instrument as claimed in claim 1 is used the pressurized air TT&C system; It is characterized in that; Said pressure control loop comprises decompression valve, second needle valve, pick-up unit and the tensimeter that connects successively, and second needle valve is connected with the oil strain water treatment plant, and tensimeter is connected with the 3rd needle valve.
6. investigating method that adopts the said power plant instrument of claim 1 with the pressurized air TT&C system is characterized in that its step is:
1) sends instruction from scattered control system, open reduction valve, first needle valve, second needle valve, the 3rd needle valve successively, purge measuring pipeline;
2) purge to setting-up time, send instruction from scattered control system and close reduction valve, first needle valve successively;
3) after first needle valve was closed, the pressure control loop of scattered control system dropped into automatically, and the aperture of control decompression valve makes pressure remain on setting value;
4) after pressure control loop is devoted oneself to work setting-up time, pick-up unit is placed detecting position; The signal that pick-up unit is measured is delivered to scattered control system; Tensimeter, pressure unit are delivered to scattered control system with measured measurement pipeline pressure P 1, gas-holder pressure P 2; Scattered control system utilizes formula operation to try to achieve the dew point calculated value T of gas-holder according to measuring pipeline pressure P 1, gas-holder pressure P 2 and dew point measured value t; X: intermediate variable, represent In (Pv1*P2/P1), Pv1: measuring channel water in air vapor partial pressure power;
Wherein said formula does,
When-60 ℃＜t＜0 ℃,
When 0 ℃＜t＜70 ℃,
When
The time,
When
The time,
5) scattered control system is tried to achieve the dew point calculated value T of gas-holder with computing, and the compressed air temperature of the gas-holder that records with temperature transmitter compares, and deviation is promptly sent alerting signal less than 15 ℃; Deviation is less than 10 ℃, and scattered control system is promptly sent the instruction unpack drain solenoid valve, carries out draining;
6) pick-up unit is placed stop to measure the position;
7) be 0 from scattered control system with the set of decompression valve aperture;
8) send instruction from scattered control system and close the 3rd needle valve, second needle type regulating valve successively;
9) like the need draining, after draining reached setting-up time, scattered control system was sent the order fulfillment draining.
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| CN201010224967XA CN101901007B (en) | 2010-07-13 | 2010-07-13 | Compressed air measuring and controlling system and method for power plant instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010224967XA CN101901007B (en) | 2010-07-13 | 2010-07-13 | Compressed air measuring and controlling system and method for power plant instrument |
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| CN101901007B true CN101901007B (en) | 2012-07-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105891418B (en) * | 2016-04-06 | 2018-02-02 | 陈均 | A kind of oil content and dew point comprehensive detection device |
| CN106215640B (en) * | 2016-08-30 | 2019-07-12 | 大连船舶重工集团有限公司 | A kind of low temperature anti-condensation control air system |
| CN113125654A (en) * | 2021-04-27 | 2021-07-16 | 上海华复市政工程技术有限公司 | Utensil sweeps gaseous monitoring facilities waterproof construction in pit of device |
| CN113857147A (en) * | 2021-09-13 | 2021-12-31 | 安徽万维克林精密装备有限公司 | Multifunctional automatic purging device |
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| CN1383042A (en) * | 2002-05-24 | 2002-12-04 | 浙江大学 | Automatic controller for lowering pressure of high-pressure gas by volume expansion |
| US7125007B2 (en) * | 2003-06-25 | 2006-10-24 | Spraying Systems Co. | Method and apparatus for reducing air consumption in gas conditioning applications |
| CN101725833B (en) * | 2009-12-02 | 2013-03-06 | 中国广东核电集团有限公司 | Compressed air distribution system for instrument and on-line isolation method for compressed air tank thereof |
| CN201698224U (en) * | 2010-07-13 | 2011-01-05 | 山东电力研究院 | Compressed-air measurement and control system for instrument in power plant |
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: Shandong Electric Power Research Institute Patentee after: State Grid Corporation of China Address before: 250002, No. 500, South Second Ring Road, Shizhong District, Shandong, Ji'nan Patentee before: Shandong Electric Power Research Institute Patentee before: State Grid Corporation of China |
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Effective date of registration: 20220126 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |