CN205449745U - Cigarette dust content direct reading monitoring system - Google Patents
Cigarette dust content direct reading monitoring system Download PDFInfo
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- CN205449745U CN205449745U CN201521135894.1U CN201521135894U CN205449745U CN 205449745 U CN205449745 U CN 205449745U CN 201521135894 U CN201521135894 U CN 201521135894U CN 205449745 U CN205449745 U CN 205449745U
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Abstract
The utility model provides a cigarette dust content direct reading monitoring system, monitoring system includes speed sensor, diluting device and measuring device, further includes: air feeder, air feeder includes the pipeline, sets gradually heating unit on the pipeline, first -class gauge, valve, the output of valve is connected diluting device, a switching unit, the switch unit is used for making measuring unit's flue gas entry optionally intercommunication diluting device pipeline between valve and the first -class gauge, the second flowmeter, the second flowmeter sets up on the pipeline in measuring unit low reaches. The utility model has the advantages of the reliability is high, the monitoring is accurate.
Description
Technical field
This utility model relates to flue gas monitoring, particularly to dust concentration direct reading monitoring system.
Background technology
Present Domestic atmospheric environment situation is the severeest, and Thermal Power Generation Industry becomes the focus of public attention as maximum consumption coal rich and influential family, the atmosphere pollution of its discharge to the contribution of fine particle, and the most accurately measuring fine particle concentration becomes the difficult point in this field.
The most conventional detection method has light scattering method, β attenuation sensors, optical transmission method etc..
The principle of light scattering method is: the light beam from light source is irradiated in a certain space (measurement zone) containing candidate particles Nei, thus scatter, scattered light becomes the signal of telecommunication after photelectric receiver is changed, after amplified device amplifies, the mass concentration of measurement zone endoparticle thing can be calculated according to light scattering theory.Light scattering method is measured accurately, precision is high, reproducible, and measuring speed is fast, for online direct reading measurement mode, it is not necessary to sampling, real-time continuous can provide the instantaneous value of particle concentration；But light scattering method is limited to purity and the size of particulate matter, kind or the particle size range of particulate matter change, and all can cause the change of parameter value, the most also can be measured as particulate matter by the steam in wet flue gas, thus cause measured deviation.
The principle of beta ray absorption process is: the beta ray that the beta source of an intensity constant sends by medium time, beta particle collision loss mutual with the electronics in medium energy and absorbed.Under low-energy condition, degree of absorption depends on the quality of medium, unrelated with the granularity of powder dust particle, composition, color and dispersity etc..Beta ray successively through cleaning filter paper (not gathering dirt sample) and having adopted dirt sample filter paper (same filter paper), is asked for dust concentration in environment according to 2 β rays by the difference of absorbtivity.Beta ray absorption process is not by dust kind, granularity, the impact of the factors such as dispersion, shape, color, gloss；It is dust concentration indirect measurement method in accurate one, when using under at high humidity environment, sampling process easily produces moisture condensation, the water droplet being condensed out is enriched on filter paper together along with particulate matter, thus causes measured deviation.
At present, along with the rise of coal-burning power plant's minimum discharge, Limestone-gypsum Wet Flue Gas Desulfurization Process and wet dust removal technique are more and more universal, owing to wet processing exit gas temperature is low and contains a large amount of steam.Lose owing to condensation vapor can cause fine particle to be dissolved in water, the accuracy of detection data is produced large effect, and it is easily formed corrosive deposit instrument and flue gas sampling pipeline are caused serious harm, condensation method also can produce impact to measuring simultaneously, and in wet flue gas, in fine particle measurement technology, subject matter to be solved is condensation vapor problem in flue gas.
For solving the problem of emission measurement under wet flue gas environment, prior art mainly carries out BETA5M and patent CN200710122913 of the measurement of flue dust, such as ESA under wet flue gas by the way of sample lines whole process heat tracing.But this technology still suffers from problems with:
1. relatively low when flue-gas temperature, when in flue gas, self exists more drop, it is difficult to effectively vaporize drop only by omnidistance heat tracing, now drop will enter into emission measurement unit, impacts emission measurement.
2. use omnidistance heat tracing mode, require higher, once with the presence of cold spot to gas circuit insulation, heat tracing, it is easy to generation condensed water, measurement is not only impacted by the condensed water of generation, also results in corrosion of piping simultaneously, and time length also results in airway blockage.
3. omnidistance heat tracing flow path requirement on devices is high, and particularly as stop valve, effusion meter, air pump etc., onsite application may face the risk of frequent maintenance.
nullAt present，Also it has been proposed that solve the humidity problem during particle sampling by dilution method，Such as patent CN104181087A，Owing to sample lines is required high by particulate matter transmission，Therefore when designing dilution system，Flue gas sampling flow directly cannot be measured，But indirectly calculate flue gas sampling flow by sample gas flow and carrier gas flow after dilution，As a example by the dilution system of thinner ratio 1:10，Assume that flue gas sampling flow is 10L/min，Carrier gas flow is 90L/min，After dilution, sample gas flow is 100L/min，Dilution flow rate and dilution after sample gas flow all use full scale be 100L/min ± 1%F.S. Accuracy Flow Meter measure，So error of flue gas sampling is ± 2L/min，Flue gas sampling flow error is ± 20%，Corresponding thinner ratio error is ± 20%，Therefore dilution process faces the problem of maximum is exactly thinner ratio precision problem，But above-mentioned patent is accurately controlled in for thinner ratio have no and address.Simultaneously in patent CN104181087A, dilution chamber is positioned at outside flue, and it is exactly when in flue gas, humidity is higher that dilution chamber is positioned at the outer maximum problem of flue, easily produces the absorption loss of particulate matter when having condensed water to produce.
Utility model content
In order to solve the deficiency in above-mentioned prior art, this utility model provides a kind of dust concentration direct reading monitoring system.
The purpose of this utility model is achieved through the following technical solutions:
A kind of dust concentration direct reading monitoring system, described dust concentration direct reading monitoring system includes that speed measuring device, air mix facilities and measurement apparatus, described dust concentration direct reading monitoring system farther include:
Feeder, described feeder includes pipeline, the heating unit being successively set on described pipeline, first-class gauge, valve, and the outfan of described valve connects described air mix facilities；
Switch unit, described switch unit is for making the smoke inlet of measuring unit selectively communicate with the pipeline between described air mix facilities, described valve and first-class gauge；
Second gauge, described second gauge is arranged on the pipeline in described measuring unit downstream.
According to above-mentioned dust concentration direct reading monitoring system, it is preferable that described air mix facilities is arranged in flue.
According to above-mentioned dust concentration direct reading monitoring system, it is preferable that described measurement apparatus includes optical scatter analyte detection unit and/or beta ray dust instrument.
According to above-mentioned dust concentration direct reading monitoring system, it is preferable that described optical scatter analyte detection unit and beta ray dust instrument are successively set on the pipeline in described switch unit downstream.
Compared with prior art, this utility model has the beneficial effect that
1. enter into the wet flue gas dew point temperature of air mix facilities by using dilution sampling in flue to reduce, solve the condensed water during flue gas sampling, it is to avoid the sampling loss in sampling process；
2. use first-class gauge and the combination of second gauge, it doesn't matter first-class gauge whether accurate, all it is avoided that the excessive impact that certainty of measurement is brought of thinner ratio error；
3., by flue gas particles being carried out constant speed tracking sampling, it is effectively guaranteed the representativeness of particle sampling；
4. optical scatter analyte detection unit and the combination application of beta ray dust instrument, achieve the online accurately detection continuously of flue gas fine particle, the Concentration Testing of fine particle in operating mode such as before and after can meeting electrostatic precipitator, before and after wet desulphurization, before and after wet cottrell.
Accompanying drawing explanation
Referring to the drawings, disclosure of the present utility model will be easier to understand.Skilled addressee readily understands that: these accompanying drawings are used only for illustrating the technical solution of the utility model, and are not intended to be construed as limiting protection domain of the present utility model.In figure:
Fig. 1 is the structure diagram of the dust concentration direct reading monitoring system according to this utility model embodiment 1.
Detailed description of the invention
Fig. 1 and following description describe optional embodiment of the present utility model with teaching those skilled in the art how to implement and to reproduce this utility model.In order to instruct technical solutions of the utility model, simplify or eliminated some conventional aspects.Those skilled in the art should understand that be derived from these embodiments modification or replace will be in the range of this utility model.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present utility model in every way.Thus, this utility model is not limited to following optional embodiment, and is only limited by claim and their equivalent.
Embodiment 1:
Fig. 1 schematically illustrates the structure chart of the dust concentration direct reading monitoring system of this utility model embodiment, as it is shown in figure 1, described dust concentration direct reading monitoring system includes:
Sampling apparatus 21, speed measuring device 31, air mix facilities 22 and measurement apparatus 24, described air mix facilities is arranged in flue, and described measurement apparatus uses beta ray dust instrument；
Feeder, described feeder includes pipeline, the heating unit 11 that is successively set on described pipeline, first-class gauge 12, valve 13, and the outfan of described valve connects described air mix facilities；
Switch unit 23, such as three-way valve, described switch unit is for making the smoke inlet of measuring unit selectively communicate with the pipeline between described air mix facilities, described valve and first-class gauge；
Second gauge 25, described second gauge is arranged on the pipeline in described measuring unit downstream.
According to above-mentioned dust concentration direct reading monitoring system, it is preferable that described air mix facilities is arranged in flue.
The dust concentration direct-reading measurement method of this utility model embodiment, namely the work process of above-mentioned dust concentration direct reading monitoring system, described dust concentration direct-reading measurement method comprises the following steps:
(A1) requirement followed the trail of according to constant speed, and the flow velocity of flue gas in flue, thinner ratio draw the calibrated fluxes of second gauge；
(A2) described switch unit is adjusted so that the smoke inlet of described measuring unit connects the pipeline between described valve and first-class gauge；
(A3) carrier gas flows successively through described first-class gauge, second gauge, when the reading of described first-class gauge is described calibrated fluxes, the reading of described second gauge is adjusted to described calibrated fluxes；
(A4) target flow is drawn according to the current flow of flue gas in thinner ratio, flue；
(A5) described switch unit is adjusted so that carrier gas enters in described air mix facilities, mixes with the flue gas in the flue of sampling；
Measuring unit records the content of particulate matter in gaseous mixture；
(A6) sampler is adjusted so that the reading of second gauge is described target flow；
(A7) dust concentration in flue gas is known according to the difference (namely flue gas flow) of the reading of content, second gauge and the first-class gauge of described particulate matter.
During above-mentioned monitoring, if described current flow changes, adjust the flow of described carrier gas so that the reading of described second gauge maintains described target flow；Recalculate current thinner ratio and send step (A7).
Embodiment 2:
The dust concentration direct reading monitoring system of this utility model embodiment, as different from Example 1:
Measurement apparatus includes optical scatter analyte detection unit and the beta ray dust instrument being successively set on switch unit downstream pipe.
During monitoring, utilize optical scatter analyte detection unit and beta ray dust instrument to record particle content respectively successively, and the output valve of optical scatter analyte detection unit is adjusted to the output valve of beta ray dust instrument；Optical scatter analyte detection unit is utilized to realize the continuous measurement of dust concentration.
Claims (4)
1. a dust concentration direct reading monitoring system, described dust concentration direct reading monitoring system includes speed measuring device, air mix facilities and measurement apparatus, it is characterised in that: described dust concentration direct reading monitoring system farther includes:
Feeder, described feeder includes pipeline, the heating unit being successively set on described pipeline, first-class gauge, valve, and the outfan of described valve connects described air mix facilities；
Switch unit, described switch unit is for making the smoke inlet of measuring unit selectively communicate with the pipeline between described air mix facilities, described valve and first-class gauge；
Second gauge, described second gauge is arranged on the pipeline in described measuring unit downstream.
Dust concentration direct reading monitoring system the most according to claim 1, it is characterised in that: described air mix facilities is arranged in flue.
Dust concentration direct reading monitoring system the most according to claim 1, it is characterised in that: described measurement apparatus includes optical scatter analyte detection unit and/or beta ray dust instrument.
Dust concentration direct reading monitoring system the most according to claim 3, it is characterised in that: described optical scatter analyte detection unit and beta ray dust instrument are successively set on the pipeline in described switch unit downstream.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521135894.1U CN205449745U (en) | 2015-12-31 | 2015-12-31 | Cigarette dust content direct reading monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521135894.1U CN205449745U (en) | 2015-12-31 | 2015-12-31 | Cigarette dust content direct reading monitoring system |
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| CN205449745U true CN205449745U (en) | 2016-08-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527203A (en) * | 2015-12-31 | 2016-04-27 | 聚光科技(杭州)股份有限公司 | Smoke dust concentration direct-reading monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527203A (en) * | 2015-12-31 | 2016-04-27 | 聚光科技(杭州)股份有限公司 | Smoke dust concentration direct-reading monitoring system and method |
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