CN104237090A - Method and device for quickly determining dust concentration in flue gas of dust collector - Google Patents
Method and device for quickly determining dust concentration in flue gas of dust collector Download PDFInfo
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- CN104237090A CN104237090A CN201410487288.XA CN201410487288A CN104237090A CN 104237090 A CN104237090 A CN 104237090A CN 201410487288 A CN201410487288 A CN 201410487288A CN 104237090 A CN104237090 A CN 104237090A
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- flue gas
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Abstract
The invention discloses a method and a device for quickly determining the dust concentration in flue gas of a dust collector. The method comprises the following steps: firstly, collecting the flue gas in the dust collector by using a flue gas sampling gun; secondly, feeding the collected flue gas into a sealed illumination unit; thirdly, converting an optical signal penetrating through a second convex lens into a current signal of 4-20mA; fourthly, inputting the current signal into a microcomputer, outputting the dust concentration corresponding to the current signal by the microcomputer and finishing the determination of the dust concentration. The optical signal is converted into an electric signal by a photoelectric conversion unit; after the photoelectric conversion unit is connected with the illumination unit by an electric wire, the electric signal is directly analyzed to obtain the dust concentration, the influence on a light path due to non-uniformity of refractive index caused by flue vibration and nonuniform smoke temperature in the prior art is eliminated, so that the test result is accurate and reliable; a standard curve is preset in the microcomputer, so the determination of constant weight of a filter cylinder before and after test is avoided; besides, the sampling time can be shortened, so the test time can be greatly shortened.
Description
Technical field
The invention belongs to field of environment engineering technology, particularly relate to method and the device of dust concentration in a kind of flue gas of Fast Measurement fly-ash separator.
Background technology
In recent years, along with the raising of environmental protection standard, increasing electrostatic fabric filter and sack cleaner are used, and simple with its structure, the efficient feature of sack cleaner is widely used in Large-scale fire-electricity unit dedusting.But, the on-line monitoring of the cloth bag part of sack cleaner and electrostatic fabric filter is comparatively simple, and the laser dust monitor of common on-line monitoring vibrates due to flue and the uneven uneven light path that causes of refractive index that causes of cigarette temperature swings, make test result accuracy very low, when cloth bag occurs damaged, can only monitor by hand and find the part of cloth bag breakage to carry out examine and replace, and the conventional tobacco damping-off gravimetric method method sampling time is long, add the constant weight of filter cylinder before and after sampling, a monitoring time is greatly about 6 ~ 8 hours, the time of fault discovery and process is quite long.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of dust concentration method of testing length consuming time in existing flue gas, method and the device of dust concentration in a kind of flue gas of Fast Measurement fly-ash separator are provided, use the method can measure dust concentration in cleaner exiting flue gas accurately rapidly, the cloth bag partial fault of sack cleaner and electrostatic fabric filter is found rapid, timely.
A method for dust concentration in the flue gas of Fast Measurement fly-ash separator, comprises following step:
Step 1: utilize the flue gas in gas sampling gun collection fly-ash separator;
Step 2: the light illuminating unit flue gas gathered being sent into sealing;
Light source produce light through first convex lens formed directional light, described directional light by after the flue dust scattering in flue gas, through the second convex lens;
Described light source is arranged on light illuminating unit side, and the first convex lens and source parallel are installed, and described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
Described first convex lens and the second convex lens are detachable installation.
Step 3: the current signal light signal through the second convex lens being converted into 4 ~ 20mA;
Step 4: current signal is inputted microcomputer, utilize the typical curve of electric current and the dust concentration be preset in microcomputer, microcomputer exports the dust concentration corresponding with current signal, completes dust concentration and measures;
Wherein, the pipeline be connected is disposed with flowmeter and constant flow pump with the gas outlet of light illuminating unit, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
Flowmeter ensures consistent with the flue gas flow being arranged to sample in test process of constant flow pump.
The electric current of photoelectric commutator and the typical curve of flue gas concentration when the typical curve of described electric current and dust concentration comprises electric precipitator, electrostatic fabric filter and sack cleaner tobacco damping-off;
Described typical curve is the data adopting gravimetric method to test dust concentration and the corresponding instrument current signal obtained to carry out matching and obtains.
In described step 3, light signal being converted to current signal is that light signal is obtained current signal by photoelectric switching circuit, amplifying circuit and current/charge-voltage convertor successively.
Described microcomputer is also provided with interactive unit.
Described interactive unit comprises display unit and keyboard, and keyboard is for selecting corresponding typical curve, and display unit is for showing dust concentration.
Filtrating smoke dust unit is also provided with between described gas outlet and flowmeter.
A device for dust concentration in the flue gas of Fast Measurement fly-ash separator, the method for dust concentration in the flue gas of the Fast Measurement fly-ash separator described in realization, comprises gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit;
Described gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit are connected successively;
The inlet end of described gas sampling gun is connected with house outlet end flue, and the endpiece of described gas sampling gun is connected with the air intake opening of light illuminating unit;
Described light illuminating unit is packoff, inside comprises light source, the first convex lens and the second convex lens, one end, top of described light illuminating unit is provided with air intake opening, described light source is arranged on light illuminating unit side, first convex lens and source parallel are installed, described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
The pipeline be connected with described gas outlet is provided with flowmeter and constant flow pump successively;
Described signal conversion unit comprises the photoelectric switching circuit, amplifying circuit and the current/charge-voltage convertor that are connected successively;
Described signal measuring unit is microcomputer, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
Described gas sampling gun is sampling pipe, and sampling pipe and light illuminating unit connecting place are provided with 90 ° of elbows, and described elbow adopts flexible pipe to be connected with the air intake opening of light illuminating unit.
The effect of 90 ° of elbows guarantees sampling gun just to tested flue gas stream direction, to ensure the accuracy of test result.
Described flexible pipe is silicone rubber tube, and high temperature resistant scope is 100 ~ 200 DEG C.
Also be provided with the interactive unit be connected with microcomputer, described interactive unit comprises display unit and keyboard.
Whole proving installation is connected by means of only sampling gun with the flue of fly-ash separator, eliminates proving installation in prior art and is arranged on flue, due to flue vibration with cigarette temperature is uneven causes the uneven impact on light path of refractive index, makes test result accurate, reliably.
Beneficial effect
The invention provides method and the device of dust concentration in a kind of flue gas of Fast Measurement fly-ash separator, the method comprises following step: step 1: utilize the flue gas in gas sampling gun collection fly-ash separator; Step 2: the light illuminating unit flue gas gathered being sent into sealing; Light step 3: the current signal light signal through the second convex lens being converted into 4 ~ 20mA; Step 4: current signal is inputted microcomputer, utilize the typical curve of electric current and the dust concentration be preset in microcomputer, microcomputer exports the dust concentration corresponding with current signal, completes dust concentration and measures.Utilize directional light that light source produces through the first convex lens due to after the scattering of flue dust, again through the second convex lens, by photoelectric conversion unit, light signal is converted to electric signal, after adopting electric wire to be connected with light illuminating unit, directly carrying out analysis to electric signal obtains dust concentration, whole proving installation is connected by means of only sampling gun with the flue of fly-ash separator, eliminating proving installation in prior art is arranged on flue, due to flue vibration with cigarette temperature is uneven causes the uneven impact on light path of refractive index, make test result accurate, reliably; Pre-set criteria curve in microcomputer, not be used in before and after test and carries out constant weight to filter cylinder, can reduce the sampling time simultaneously, greatly can reduce the test duration;
This device comprises gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit; Total is simple, with low cost, be easy to promote and easy to use.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention;
Fig. 2 is sampling gun structural representation;
Label declaration: 1-sampling pipe, 2-elbow, 3-flowmeter, 4-filter element, 5-photoelectric switching circuit, 6-amplifying circuit, 7-change-over circuit, 8-microcomputer, 9-display unit, 10-keyboard, 11-light source, 12-first convex lens, 13-second convex lens, 14-air intake opening, 15-gas outlet, 16-constant flow pump.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
A method for dust concentration in the flue gas of Fast Measurement fly-ash separator, comprises following step:
Step 1: utilize the flue gas in gas sampling gun collection fly-ash separator;
Step 2: the light illuminating unit flue gas gathered being sent into sealing;
Light source produce light through first convex lens formed directional light, described directional light by after the flue dust scattering in flue gas, through the second convex lens;
Described light source is arranged on light illuminating unit side, and the first convex lens and source parallel are installed, and described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
Described first convex lens and the second convex lens are detachable installation.
Step 3: the current signal light signal through the second convex lens being converted into 4 ~ 20mA;
Step 4: current signal is inputted microcomputer, utilize the typical curve of electric current and the dust concentration be preset in microcomputer, microcomputer exports the dust concentration corresponding with current signal, completes dust concentration and measures;
Wherein, the pipeline be connected is disposed with flowmeter and constant flow pump with the gas outlet of light illuminating unit, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
Flowmeter ensures consistent with the flue gas flow being arranged to sample in test process of constant flow pump.
The electric current of photoelectric commutator and the typical curve of flue gas concentration when the typical curve of described electric current and dust concentration comprises electric precipitator, electrostatic fabric filter and sack cleaner tobacco damping-off;
Described typical curve is the data adopting gravimetric method to test dust concentration and the corresponding instrument current signal obtained to carry out matching and obtains.
In described step 3, light signal being converted to current signal is that light signal is obtained current signal by photoelectric switching circuit, amplifying circuit and current/charge-voltage convertor successively.
Described microcomputer is also provided with interactive unit.
Described interactive unit comprises display unit and keyboard, and keyboard is for selecting corresponding typical curve, and display unit is for showing dust concentration.
Filtrating smoke dust unit is also provided with between described gas outlet and flowmeter.
As depicted in figs. 1 and 2, the device of dust concentration in a kind of flue gas of Fast Measurement fly-ash separator, the method for dust concentration in the flue gas of the Fast Measurement fly-ash separator described in realization, comprises gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit;
Described gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit are connected successively;
The inlet end of described gas sampling gun is connected with house outlet end flue, and the endpiece of described gas sampling gun is connected with the air intake opening of light illuminating unit;
Described light illuminating unit is packoff, inside comprises light source, the first convex lens and the second convex lens, one end, top of described light illuminating unit is provided with air intake opening, described light source is arranged on light illuminating unit side, first convex lens and source parallel are installed, described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
The pipeline be connected with described gas outlet is provided with flowmeter and constant flow pump successively;
Described signal conversion unit comprises the photoelectric switching circuit, amplifying circuit and the current/charge-voltage convertor that are connected successively;
Described signal measuring unit is microcomputer, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
Described gas sampling gun is sampling pipe, and sampling pipe and light illuminating unit connecting place are provided with 90 ° of elbows, and described elbow adopts flexible pipe to be connected with the air intake opening of light illuminating unit.
The effect of 90 ° of elbows guarantees sampling gun just to tested flue gas stream direction, to ensure the accuracy of test result.
Described flexible pipe is silicone rubber tube, and high temperature resistant scope is 100 ~ 200 DEG C.
Also be provided with the interactive unit be connected with microcomputer, described interactive unit comprises display unit and keyboard.
Embodiment 1:
In the flue gas of the fly-ash separator of Fast Measurement described in this example, the device of dust concentration is rectangle, long 400mm, wide 120mm, high 150mm; Sampling pipe 1, elbow 2, light illuminating unit, flowmeter 3 and constant flow pump 16 form flue gas sampling passage, flowmeter 3 is all connected with microcomputer 8 with constant flow pump 16, flowmeter 3 imports the flue gas flow signal of Real-time Collection into microcomputer 8, microcomputer 8 is according to the flue gas sampling flow control constant flow pump 16 of setting, make flue gas flow in sampling process keep constant, guarantee that sampling flow is stabilized in 1L/min; Between described gas outlet 15 and flowmeter, being also provided with filtrating smoke dust unit, for filtering the dust in flue gas, preventing flow meter, sampling pump and surrounding environment from polluting; The directional light produced by light source 11 and the first convex lens 12 passes the second convex lens 13 after flue dust scattering, light through the second convex lens changes into electric signal through photoelectric switching circuit 5,4 ~ 20mA current signal is obtained again through amplifying circuit 6 and change-over circuit 7, microcomputer 8 pairs of current signals are analyzed, the electric current of different dedusting method (electric precipitator, electrostatic fabric filter, sack cleaner) and the typical curve of dust concentration is stored in microcomputer, current signal according to input changes out dust concentration, and is shown by display unit 9.Be adsorbed on lens surface for preventing flue dust to impact test, the first convex lens 12, second convex lens 13 are disassembling cleaning all.The size of sampling flue gas flow can be set by keyboard.
Make sampling gun by the steel pipe of a Φ 6mm, wherein flue part has one 90 degree of elbows, and during test, elbow is just to airflow direction, is connected with the air intake opening 14 of light illuminating unit.
The 3012H+ fume automatic analyzer produced with device of the present invention and Qingdao LaoShan Application Technology Research Institute exports at certain power plant five electric-field dust collector and carries out contrast test: apply 3012H+ fume automatic analyzer certain power plant five electric-field dust collector export measure time operating weight method carry out measurement of soot and dust concentration; Apply device of the present invention to carry out test and need tester 1, a flue test duration 2min, 4 flue total testing times are 8 minutes; And adopt gravimetric method to need tester 3,50 minutes each flue sampling times, each 2 hours of filter cylinder constant weight time before and after sampling, 4 flue total testing times 440 minutes.
The test result of device of the present invention is followed successively by 28.3mg/m
3(mark state, identical below), 26.9mg/m
3, 25.7mg/m
3, 29.1mg/m
3; Gravimetric method test result is followed successively by 28.9mg/m
3, 26.3mg/m
3, 25.1mg/m
3, 29.8mg/m
3; Two kinds of test result good relationship.
The 3012H+ fume automatic analyzer produced with device of the present invention and Qingdao LaoShan Application Technology Research Institute exports at certain power plant's sack cleaner and carries out contrast test: apply 3012H+ fume automatic analyzer certain power plant's sack cleaner export measure time operating weight method carry out measurement of soot and dust concentration; Apply device of the present invention to carry out test and need tester 1, a flue test duration 2min, 4 flue total testing times are 8 minutes, and adopt gravimetric method to need tester 3,50 minutes each flue sampling times, each 2 hours of the filter cylinder constant weight time before and after sampling, 4 flue total testing times 440 minutes.
Device to test result of the present invention 13.6mg/m successively
3(mark state, identical below), 16.3mg/m
3, 15.5mg/m
3, 15.1mg/m
3; Gravimetric method test result 13.9mg/m
3, 16.2mg/m
3, 16.1mg/m
3, 14.9mg/m
3; Two kinds of test result good relationship.
As can be seen from above-mentioned contrast test result, apply device of the present invention when carrying out measurement of soot and dust concentration, measurement result and surveying instrument of the prior art basically identical, but the time reduces greatly, the measurement of dust concentration in the flue gas of dedusting instrument outlet can be completed fast.The test result of dust concentration is analyzed, is of value to the fault judging fly-ash separator fast.
Claims (9)
1. a method for dust concentration in the flue gas of Fast Measurement fly-ash separator, is characterized in that, comprise following step:
Step 1: utilize the flue gas in gas sampling gun collection fly-ash separator;
Step 2: the flue gas gathered is sent into light illuminating unit;
Light source produce light through first convex lens formed directional light, described directional light by after the flue dust scattering in flue gas, through the second convex lens;
Described light source is arranged on light illuminating unit side, and the first convex lens and source parallel are installed, and described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
Step 3: the current signal light signal through the second convex lens being converted into 4 ~ 20mA;
Step 4: current signal is inputted microcomputer, utilize the typical curve of electric current and the dust concentration be preset in microcomputer, microcomputer exports the dust concentration corresponding with current signal, completes dust concentration and measures;
Wherein, the pipeline be connected is disposed with flowmeter and constant flow pump with the gas outlet of light illuminating unit, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
2. the method for dust concentration in the flue gas of Fast Measurement fly-ash separator according to claim 1, it is characterized in that, the typical curve of described electric current and dust concentration comprises the electric current of electric precipitator, electrostatic fabric filter and sack cleaner and the typical curve of flue gas concentration;
Described typical curve is the data adopting gravimetric method to test dust concentration and the corresponding instrument current signal obtained to carry out matching and obtains.
3. the method for dust concentration in the flue gas of Fast Measurement fly-ash separator according to claim 1, it is characterized in that, in described step 3, light signal being converted to current signal is that light signal is obtained current signal by photoelectric switching circuit, amplifying circuit and current/charge-voltage convertor successively.
4. in the flue gas of the Fast Measurement fly-ash separator stated according to claim 1, the method for dust concentration, is characterized in that, described microcomputer is also provided with interactive unit.
5. in the flue gas of Fast Measurement fly-ash separator according to claim 4, the method for dust concentration, is characterized in that, be also provided with filtrating smoke dust unit between described gas outlet and flowmeter.
6. the device of dust concentration in the flue gas of a Fast Measurement fly-ash separator, it is characterized in that, realize the method for dust concentration in the flue gas of the Fast Measurement fly-ash separator described in claim 1-5, comprise gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit;
Described gas sampling gun, light illuminating unit, signal conversion unit and signal measuring unit are connected successively;
The inlet end of described gas sampling gun is connected with house outlet end flue, and the endpiece of described gas sampling gun is connected with the air intake opening of light illuminating unit;
Described light illuminating unit comprises light source, the first convex lens and the second convex lens, one end, top of described light illuminating unit is provided with air intake opening, described light source is arranged on light illuminating unit side, first convex lens and source parallel are installed, described second convex lens are arranged on above light illuminating unit, offer gas outlet below described light illuminating unit;
Wherein, the pipeline be connected with the gas outlet of light illuminating unit is disposed with flowmeter and constant flow pump;
Described signal conversion unit comprises the photoelectric switching circuit, amplifying circuit and the current/charge-voltage convertor that are connected successively;
Described signal measuring unit is microcomputer, and described flowmeter is all connected with microcomputer with constant flow pump, and constant flow pump is controlled by microcomputer.
7. the device of dust concentration in the flue gas of Fast Measurement fly-ash separator according to claim 6, it is characterized in that, described gas sampling gun is sampling pipe (1), and sampling pipe (1) and light illuminating unit connecting place are provided with 90 ° of elbows (2), described elbow adopts flexible pipe to be connected with the air intake opening of light illuminating unit.
8. the device of dust concentration in the flue gas of Fast Measurement fly-ash separator according to claim 7, it is characterized in that, described flexible pipe is silicone rubber tube, and high temperature resistant scope is 100 ~ 200 DEG C.
9. the device of dust concentration in the flue gas of Fast Measurement fly-ash separator according to claim 8, it is characterized in that, be also provided with the interactive unit be connected with microcomputer, described interactive unit comprises display unit and keyboard.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410487288.XA CN104237090A (en) | 2014-09-22 | 2014-09-22 | Method and device for quickly determining dust concentration in flue gas of dust collector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410487288.XA CN104237090A (en) | 2014-09-22 | 2014-09-22 | Method and device for quickly determining dust concentration in flue gas of dust collector |
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|---|---|---|---|
| CN201410487288.XA Pending CN104237090A (en) | 2014-09-22 | 2014-09-22 | Method and device for quickly determining dust concentration in flue gas of dust collector |
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Cited By (3)
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| CN109954341A (en) * | 2017-12-25 | 2019-07-02 | 喜开理株式会社 | Filter for installation |
| CN110208156A (en) * | 2019-06-05 | 2019-09-06 | 盐城市联鑫钢铁有限公司 | A kind of Smoke Monitoring System |
| CN110812964A (en) * | 2019-10-22 | 2020-02-21 | 南京科赫科技有限公司 | Intelligent alarming bag type dust collector |
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Application publication date: 20141224 |