CN1080721A - Smoke sampling antomatic uniform velocity controlling system - Google Patents
Smoke sampling antomatic uniform velocity controlling system Download PDFInfo
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- CN1080721A CN1080721A CN 92106989 CN92106989A CN1080721A CN 1080721 A CN1080721 A CN 1080721A CN 92106989 CN92106989 CN 92106989 CN 92106989 A CN92106989 A CN 92106989A CN 1080721 A CN1080721 A CN 1080721A
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Abstract
Smoke sampling antomatic uniform velocity controlling system.Constant speed adaptive control when being mainly used in smoke dust sampling.Carry out the pressure value by differential pressure pick-up, and be translated into associated electrical signals, compare through a comparer again, when fiducial value exceeds the scope that is allowed, then comparer is exported a control signal, the output voltage of control executing mechanism, thereby the speed of evacuation of adjustment aspiration pump.This system will make sampling remain isokinetic sampling's condition.And realized being widely used in the automatic control of isokinetic conditions in the sampled measurements of various fluids.
Description
The invention belongs to a kind of smoke dust sampling constant speed adaptive control system, be mainly used in the sampled measurements of flue dust.
The sampling of flue dust must be carried out under the situation of constant speed, and promptly gas enters the sampling speed of chewing and should equate with the flue gas flow rate of sampling in the flue.Its relative error should be controlled within-5～+ 10%, this be accurate reconnaissance smoke sample must guarantee.The method of sampling of keeping constant speed now has predicted velocity method, balanced type isokinetic sampling to manage method.The operating process of predicted velocity method is many, and calculating is heavy numerous, and can't follow the tracks of velocity of flue gas at any time, and sampling precision is low, now no longer adopts.The isokinetic sampling manages static balance and two kinds of patterns of kinetic pressure balancing at present, this method does not need to calculate in advance isokinetic sampling's flow, can directly sampling pipe be placed on the sampled point, regulate sampling flow, making static pressure or the dynamic pressure static pressure or the dynamic pressure that equal measuring point flue gas of sampling in chewing, can reach isokinetic sampling's purpose.This method has improvement greatly than the predicted velocity method, but because present balanced type smoke dust sampling instrument mostly adopts tilting micromanometer to do balance or pressure indication, pointing accuracy is not high, operating personnel must regulate sampling flow at any time to follow the tracks of flue gas flow rate, be that this isokinetic sampling keeps by people's the constantly circulation of relatively judging, regulate, this has brought pressure to operating personnel undoubtedly, also will cause bigger measuring error.
Purpose of the present invention is exactly the control method of isokinetic conditions in the time of will improving smoke dust sampling, and the manual adjustment when subduction operating personnel constant speed is measured realizes the automatic control of isokinetic conditions.
According to purpose of the present invention, the present invention utilizes differential pressure pick-up, comparer and topworks to be combined into a kind of smoke sampling antomatic uniform velocity controlling system.Cancel existing tilting micromanometer and replace the manually method of control constant speed.
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 is a prior art constant speed smoke dust sampling synoptic diagram;
Fig. 2 is one embodiment of the present of invention;
Fig. 3 is an another embodiment of the present invention.
From accompanying drawing as can be seen, the dynamic pressure balancing constant speed smoke dust sampling system of prior art is that the sampling pipe (1) that will insert flue promptly is called isokinetic sampling's pipe, S pitot tube (2) is arranged in parallel with smoke dust sampling pipe (3), when sampling pipe (1) inserts by one in the duplex microbarograph (4) the dynamic pressure value of pointing out this point, make consistent that its dynamic pressure value and S pitot tube (2) surveyed by regulating by-pass valve (5) control sample rate, can carry out the isokinetic sampling, duplex microbarograph (4) is composed in parallel by two single tube inclination microbarographs (6) (7).Tilting micromanometer is convenient to reading directly perceived, but can't directly change reading into corresponding electric signal, therefore also just can not accomplish automatic isokinetic sampling.Static pressure balanced similar to dynamic pressure balancing, be that static pressure balanced isokinetic sampling manages difference, he exports sampling and chews inside and outside two place's static pressures, therefore only needs a tilting micromanometer to do the indication at zero point, and structure is simple than dynamic pressure balancing.But it is static pressure balanced really a little from levels of precision than kinetic pressure balancing difference.
The present invention is a principle of utilizing the differential pressure sensing, adopt differential pressure pick-up to gather the moving or static pressure of flue and flue dust collection tube, and its value is converted to electric signal, after comparing through a comparer, fiducial value is delivered to topworks, the speed of evacuation of control aspiration pump makes it keep isokinetic sampling's condition.If fiducial value exceeds allowed band, comparer will be exported an electric signal by topworks, adjust the pumping speed of sampling aspiration pump automatically, in the hope of guaranteeing isokinetic sampling's condition.
First embodiment of the present invention (as Fig. 2) utilizes two differential pressure pick-ups (8,9) to replace existing kinetic pressure balancing inclination microbarograph.A differential pressure pick-up (8) is by proofed sleeve (10,11) be connected in S pitot tube (12), be used to measure the dynamic pressure value in the flue, another differential pressure pick-up (9) also is by proofed sleeve (13,14) be connected on the orifice plate (16) of sampling pipe (15), be used to measure the dynamic pressure in the smoke dust sampling pipe, and the dynamic pressure value in the sampling pipe that dynamic pressure value and differential pressure pick-up (9) measure in the flue that simultaneously differential pressure pick-up (8) is measured is converted to electric signal and sends into simultaneously in the comparer (28) and compare, and the result that will compare delivers to topworks (17), the speed of evacuation by topworks (17) control aspiration pump (18), keep kinetic pressure balancing with assurance flue and sampling pipe, i.e. isokinetic conditions.Departing from appears in result relatively when comparer (28), i.e. dynamic pressure in the dynamic pressure of flue and the sampling pipe is inconsistent, then will adjust the speed of evacuation of aspiration pump (18) by topworks (17) at once, makes it to recover isokinetic conditions.Also can change (19) by A/D at the output terminal of differential pressure pick-up (8) and connect computing machine or numeric display unit, realize the automatic demonstration of flue gas flow rate.
Second embodiment of the present invention is static pressure balanced (see figure 3).Adopt a differential pressure pick-up (20), and with the pressure measurement point of differential pressure pick-up (20), be connected to sampling by rubber tube (21,22) and chew the inner chamber (30) and the outside surface (29) of (23), measure and take to manage inside and outside static pressure difference, and its difference is converted to electric signal, send into comparer (24) and compare with the device at zero point (25) that is provided with.The input end of comparer (24) links to each other with zero setting device (25) with differential pressure pick-up (20) respectively, and the output terminal of comparer (24) links to each other with topworks (26).If differential pressure value of being surveyed and set zero deviation surpass allowed band, will pass through the pumping speed of topworks (26) control aspiration pump (27) automatically, make it to recover isokinetic conditions.Zero setting device (25) can be to be made of a potentiometer.
The present invention adopts the mode of differential pressure sensing to replace the inclination microbarograph, has realized the automatic control of constant speed, and its control accuracy can be much higher than artificial reading, the mode of manual adjustment, and greatly reduce operative employee's labour intensity.In conjunction with other electronic installation, this control system even can directly demonstrate flue gas flow rate is exempted a large amount of complicated calculations, during the smoke dust sampling monitoring of can be extensively polluting with subenvironment and other dust sampling are measured.And has a broad prospect for its application.
Claims (4)
1, smoke sampling antomatic uniform velocity controlling system is characterized in that this system is the automatic control system that is made of two differential pressure pick-ups (8,9), comparer (16), topworks (17).The pressure tappings of differential pressure pick-up (8,9) is linked to each other with sampling pipe (15) with S pitot tube (5) respectively by rubber (10,11,13,14), and the electrical signal of differential pressure pick-up (8,9) inserts comparer (16) respectively, the outlet of comparer (16) is connected with the automatic control executing mechanism (17) of processing comparer (a 16) fiducial value, and directly controls aspiration pump (18) by topworks (17).
2, control system as claimed in claim 1 is characterized in that: on the output contact of differential pressure pick-up (8), also can connect computing machine or numeric display unit by a modulus a/d transducer (19).
3, control system as claimed in claim 1, its feature is that also native system is made of a differential pressure pick-up (20) and comparer (24), topworks (26), aspiration pump (27), and the pressure tappings of differential pressure pick-up (20) is connected to sampling respectively by rubber tube (21,22) and chews the inner chamber (28) and the outside surface (29) of (23).And the input end of comparer (24) links to each other with zero setting device (25) with differential pressure pick-up (20) respectively, and the output terminal of comparer (24) links to each other with topworks (26).
4,, it is characterized in that zero setting device (25) is made of potentiometer as claim 1 and 3 described control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106989 CN1080721A (en) | 1992-07-02 | 1992-07-02 | Smoke sampling antomatic uniform velocity controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106989 CN1080721A (en) | 1992-07-02 | 1992-07-02 | Smoke sampling antomatic uniform velocity controlling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1080721A true CN1080721A (en) | 1994-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92106989 Pending CN1080721A (en) | 1992-07-02 | 1992-07-02 | Smoke sampling antomatic uniform velocity controlling system |
Country Status (1)
| Country | Link |
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| CN (1) | CN1080721A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139933B (en) * | 2006-09-06 | 2010-08-11 | 郑州市光力科技发展有限公司 | Mining gas discharging multi-parameter measuring instrument having negative pressure compensating function |
| CN102103044A (en) * | 2011-01-20 | 2011-06-22 | 马鞍山钢铁股份有限公司 | Isokinetic smoke dust sampling device and sampling method |
| CN102564912A (en) * | 2011-12-31 | 2012-07-11 | 杭州哲达科技股份有限公司 | Dust concentration detecting method and detector with gas velocity compensation |
| CN102944450A (en) * | 2012-11-26 | 2013-02-27 | 力合科技（湖南）股份有限公司 | System and method for absorbing heavy metal particles in flue gas |
| CN103175752A (en) * | 2011-12-21 | 2013-06-26 | 中国石油大学(华东) | Intelligent online isokinetic sampling equipment |
| CN104931146A (en) * | 2014-03-21 | 2015-09-23 | 中石化洛阳工程有限公司 | Device for measuring furnace flue gas temperature |
| CN108956694A (en) * | 2018-07-09 | 2018-12-07 | 河南省科学院能源研究所有限公司 | The device and method of biomass and coal combustion ratio in a kind of detection coupling combustion |
| CN112129898A (en) * | 2020-10-30 | 2020-12-25 | 江苏方天电力技术有限公司 | Device and method for on-line monitoring of sulfur trioxide concentration in coal-fired flue gas |
-
1992
- 1992-07-02 CN CN 92106989 patent/CN1080721A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139933B (en) * | 2006-09-06 | 2010-08-11 | 郑州市光力科技发展有限公司 | Mining gas discharging multi-parameter measuring instrument having negative pressure compensating function |
| CN102103044A (en) * | 2011-01-20 | 2011-06-22 | 马鞍山钢铁股份有限公司 | Isokinetic smoke dust sampling device and sampling method |
| CN103175752A (en) * | 2011-12-21 | 2013-06-26 | 中国石油大学(华东) | Intelligent online isokinetic sampling equipment |
| CN102564912A (en) * | 2011-12-31 | 2012-07-11 | 杭州哲达科技股份有限公司 | Dust concentration detecting method and detector with gas velocity compensation |
| CN102944450A (en) * | 2012-11-26 | 2013-02-27 | 力合科技（湖南）股份有限公司 | System and method for absorbing heavy metal particles in flue gas |
| CN104931146A (en) * | 2014-03-21 | 2015-09-23 | 中石化洛阳工程有限公司 | Device for measuring furnace flue gas temperature |
| CN104931146B (en) * | 2014-03-21 | 2019-01-08 | 中石化洛阳工程有限公司 | A kind of measurement chamber flue gas temperature device |
| CN108956694A (en) * | 2018-07-09 | 2018-12-07 | 河南省科学院能源研究所有限公司 | The device and method of biomass and coal combustion ratio in a kind of detection coupling combustion |
| CN112129898A (en) * | 2020-10-30 | 2020-12-25 | 江苏方天电力技术有限公司 | Device and method for on-line monitoring of sulfur trioxide concentration in coal-fired flue gas |
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