CN104729890A - PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on flow feedback control - Google Patents
PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on flow feedback control Download PDFInfo
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Abstract
The invention relates to the field of environmental monitoring equipment and particularly relates to a PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on flow feedback control. The PM2.5 source analyzing and sampling device comprises a flue gas collecting assembly, a mixing residence chamber, a PM cutter and a sampling analysis unit, wherein the flue gas collecting assembly is connected to the mixing residence chamber, and the mixing residence chamber is connected to the sampling analysis unit through the PM cutter. The PM2.5 source analyzing and sampling device further comprises a second flowmeter and an air conveying unit, wherein the second flowmeter is connected between the flue gas collecting assembly and the mixing residence chamber, the air conveying unit comprises an air pump, an air filter, a buffer tank, a first proportional valve, an air conveying sensor unit and a first flowmeter, the air pump is connected to the buffer tank through the air filter, the buffer tank is connected to the first flowmeter through the first proportional valve and the air conveying sensor unit, and the first flowmeter is connected to the mixing residence chamber. According to the PM2.5 source analyzing and sampling device, the traditional stationary pollution source sampling manner is adopted, the existing products can be subjected to improvement processing, the difficulty of manufacturing is lowered, the cost is relatively low, and thus, popularization is facilitated.
Description
Technical field
The present invention relates to enviromental monitoring equipment field, a kind of for particle from fixed combustion source emission sampling system, especially for the specialized equipment gathering PM2.5.
Background technology
PM2.5 is a kind of fine particle sucked in lung, and its diameter is less than 2.5 microns, and it accounts for 80% of pellet PM10.And a large amount of particle in fossil fuel combustion process, can be produced, directly be discharged in air, can be detrimental to health, cause atmospheric pollution and destroy ecologic environment, particularly PM2.5 fine particle in flue gas, meeting extended stationary periods in an atmosphere, to health and atmosphere environment impact larger, prior art mainly concentrates on the dedusting processed PM2.5 fine particle, how practical application effect there is no clear and definite test data on earth, and this just relates to the technology to stationary pollution source PM2.5 sampling analysis.
PM2.5 sampling apparatus generally comprises flue gas induction part, diluent air part, dilution mixture part and sampling section, wherein diluent air part and dilution mixture part are the devices realizing flue gas and air mixing, its objective is simulated flue gas from floss hole out after and the mixed process of air, the particle of trapping can be similar to thinks discharge of pollutant sources particle time of day in an atmosphere, and its key is the dilution ratio controlling flue gas and surrounding air.
Way conventional is at present by being realized by diluent air admission line connection traffic meter, such as the patent of invention of the patent No. 200510086292.6 relates to diluting and sampling system for particle from fixed combustion source emission, comprise flue gas induction part, one-level dilution system, two-stage dilution system, chamber and sampling unit to grade, this invention dilutes with injection the two-stage dilution system combined by porous dilution effects, strengthens the mixing of flue gas and air.Because the flue gas flow of flue exists fluctuation, special when flow rate fluctuation is larger time, not to air mass flow with regulate in time, directly affect the precision of measurement; Meanwhile, the air mixing of the flue gas of high temperature and normal temperature, mixed volume and also can there is certain change, cause measurement result to occur deviation, thus the sampling apparatus of this structure cannot realize the accurate control to dilution ratio.In sampling system, two-way sampling is connected with chamber thieff hatch respectively, by cutter, sampling film, variable valve, spinner-type flowmeter, sampling pump composition, the particle of different-diameter although this structure can be sampled, but sampling channel is less, be unfavorable for the various compositions in analysing particulates thing, meanwhile, various device repeat layout to device interior, the utilization factor of equipment, the outward appearance of equipment have adverse influence.
Summary of the invention
the technical matters solved
Single for the flue gas sampling mode existed in prior art, accurately cannot control dilution ratio, and then the problem of simulating pollution source emission particle time of day in an atmosphere, the invention provides a kind of PM2.5 source resolution sampling apparatus based on feedback flow control, it can realize the emulation of accurately sampling and particle is aging.
technical scheme
Object of the present invention is achieved through the following technical solutions.
A kind of PM2.5 source resolution sampling apparatus based on feedback flow control, comprise smoke collecting assembly, mixing chamber, PM cutter, sampling analysis unit, smoke collecting assembly is connected to mixing chamber, mixing chamber is connected to sampling analysis unit by PM cutter, also comprise second gauge, air supply unit, second gauge arranges and is connected between smoke collecting assembly and mixing chamber, air supply unit comprises air pump, air strainer, surge tank, first proportioning valve, air feeding sensor unit, first-class gauge, air pump is connected to surge tank by air strainer, surge tank is connected to first-class gauge by the first proportioning valve through air feeding sensor unit, first-class gauge is connected to mixing chamber.
The above-mentioned PM2.5 source resolution sampling apparatus based on feedback flow control, also be provided with the 3rd flowmeter, emptying pipeline and the 4th flowmeter, 3rd flowmeter arranges and is connected between mixing chamber and PM cutter, emptying pipeline is arranged in mixing chamber, is drawn comprise the second proportioning valve, the 4th flowmeter and particulate matter filter successively by mixing chamber.
The above-mentioned PM2.5 source resolution sampling apparatus based on feedback flow control, sampling analysis unit specifically comprises branch chamber, PM analyser, PM collector, ball valve, flowmeter, sampling pump, branch chamber is connected to PM analyser and PM collector respectively, and PM collector is connected with sampling pump by ball valve, flowmeter successively.
The above-mentioned PM2.5 source resolution sampling apparatus based on feedback flow control, described smoke collecting assembly is made up of sampling probe, heating sampling feeler lever, smoke detectors unit, pitot tube, pressure difference transmitter, and pitot tube, pressure difference transmitter can measure flue gas flow rate.
The above-mentioned PM2.5 source resolution sampling apparatus based on feedback flow control, in mixing chamber, the residence time of flue gas is no less than 8 seconds, is provided with monitoring sensor in mixing chamber.
beneficial effect
Compared to prior art, the invention has the advantages that:
What 1, this patent adopted is traditional stationary pollution source sample mode, can improve processing on existing product, and manufacture difficulty reduces, and cost is lower, is easy to promote.
2, in this patent, diluents enters through air pump, enters through air strainer, removes the factor of influence in diluents, ensures to adopt accuracy, meanwhile, installs first-class gauge additional, control diluting gas flow, realize the accurate control of dilution ratio.In this patent, surge tank is set after air strainer, before the first proportioning valve, plays the effect of steady flow through first-class gauge air-flow, solve the problem of the air-flow instability that air pump causes through air strainer.This patent can take into account the parameter of detecting unit according to each flow, by regulating the aperture of proportioning valve to regulate diluent air air inflow, being applicable to flue gas isokinetic sampling environment, arriving the object accurately controlling dilution ratio.
3, because have nucleation, cohesion, the process such as aging in stationary source fume emission to air, so diluted sample gas enters chamber need the regular hour to stablizing.Increase flow regulating unit in the outlet of chamber, mainly contain proportioning valve, Venturi meter, highefficiencyparticlefilter composition.Controller stops the flow of indoor gas according to measuring, the proportioning valve of real-time automatic control flow regulon, control the flow of flow regulating unit, not only make diluted sample gas controlled to the outflow residence time from inflow chamber, and enter the stability of flow of PM cutter, ensure the reliable of sample.
4, the present invention sets up the 3rd, the 4th flowmeter at chamber end, by chamber sensor, Real-Time Monitoring is carried out to parameter wherein, and adjust the amount of chamber eluting gas, select appropriate sampling flow and emptying flow, both ensure that the residence time, in chamber, too much can not stop gas simultaneously, keep the pressure stability of system, improve sampling precision.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
In figure: 1, flue, 2, sampling probe, 3, pitot tube, 4, pressure difference transmitter, 5, heating sampling inserting tube, 6, second gauge, 7, dilution trap, 8, chamber, 9, smoke detectors unit, 10, first-class gauge, 11, air feeding sensor unit, 12, first proportioning valve, 13, high efficiency particle thing filtrator, 14, active carbon filter, 15, air pump, 16, surge tank, 17, chamber sensor, 18, 3rd flowmeter, 19, PM cutter, 20, second proportioning valve, 21, 4th flowmeter, 22, particulate matter filter, 23, branch chamber, 24, PM analyser, 25, PM collector, 26, ball valve, 27, flowmeter, 28, sampling pump, 29, control module.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the present invention is described in detail.
embodiment 1
As shown in Figure 1, the PM2.5 source resolution sampling apparatus based on feedback flow control of the present embodiment, comprises smoke collecting assembly, mixing chamber, PM cutter 19, sampling analysis unit.
Smoke collecting assembly is the unit gathering flue gas, is set directly in the pipeline of pollution source, gathers the flue gas in pipeline; Mixing chamber is that flue gas and diluents mix and the region stopped mutually, specifically comprise dilution trap 7 and chamber 8, be interconnected between dilution trap 7 and chamber 8, smoke collecting assembly is connected to dilution trap 7, and chamber 8 is connected to sampling analysis unit by PM cutter 19 again.
Second gauge 6 is also comprised in the present embodiment, air supply unit, second gauge 6 arranges and is connected between smoke collecting assembly and dilution trap 7, air supply unit comprises air pump 15, air strainer, surge tank 16, first proportioning valve 12, air feeding sensor unit 11, first-class gauge 10, air strainer can be selected according to actual needs, the present embodiment have employed the arrangement of active carbon filter 14 and the series connection of high efficiency particle thing filtrator 13, air pump 15 is connected to surge tank 16 by active carbon filter 14 and high efficiency particle thing filtrator 13, surge tank 16 is connected to first-class gauge 10 by the first proportioning valve 12 through air feeding sensor unit 11, first-class gauge 10 is connected to dilution trap 7.The gas that air pump 15 can transport by said structure, Impurity removal is realized through air strainer, then dilution trap is delivered to and flue gas mixes, thus reach the object of dilution, second gauge 6, first-class gauge 10 can respectively to flue gas, the inlet of diluents carries out accurate perception, after second gauge 6 feeds back flue gas flow, can by mode such as adjustment air pump 15 and the first proportioning valve 12 aperture etc., required flow is obtained at first-class gauge 10, thus realize the accurate control of dilution ratio, simultaneously, air feeding sensor unit 11 also can to the temperature of diluents, air pressure is monitored.
Be generally the nucleation of mixed effect and the particle ensureing flue gas and diluents, cohesion, ageing process plan true, in mixing chamber, the residence time of flue gas is generally no less than 8 seconds, chamber sensor 17 is provided with in mixing chamber, be specially temperature sensor and pressure transducer, temperature, pressure condition in chamber 8 can be monitored at any time.
embodiment 2
As the further scheme of embodiment 1, in the present embodiment, also be provided with the 3rd flowmeter 18, emptying pipeline and the 4th flowmeter 21,3rd flowmeter 18 arranges and is connected between chamber 8 and PM cutter 19, evacuated tube route chamber 8 is drawn, emptying after connecting the second proportioning valve 20, the 4th flowmeter 21 and particulate matter filter 22 successively.
The present embodiment arranges the 3rd flowmeter 18, the 4th flowmeter 21 can precise monitoring with the gas flow realizing chamber 8 and export, because the PM in flue gas deposits aerial problem of aging, and different Accurate Data Flow Control in sampling process, can be needed according to different sample requirement, once the flow entering chamber 8 is greater than sampling flow, chamber 8 pressure increase can be caused, thus cause system pressure to increase, intake resistance increases, impact gathers the work of the unit of flue gas, and then dilution ratio controls to occur error, affects sampling precision.And in this enforcement, add emptying pipeline, thus strengthen system adaptability, can adjust sampling flow flexibly according to different sample requirement, adaptability is stronger.
For better realizing robotization, control module 29 can be increased, control module is by wired or wireless mode and device connection control, by pitot tube 3, flue gas flow rate measured by pressure difference transmitter 4, flue-gas temperature is measured by smoke detectors unit 9, air pressure, the temperature of diluents is measured by air feeding sensor unit 11, air pressure, according to the flue gas of mixing chamber, the temperature of diluents, pneumatic parameter and required dilution ratio, calculate charge flow rate respectively, and the inlet of diluents is regulated by the first proportioning valve 12, thus coordinate the amount of flue gas to reach required dilution ratio.This process can be the process of dynamic conditioning, meanwhile, implements monitoring adjustment situation by chamber sensor 17.
embodiment 3
In the present embodiment, forward part structure is identical with embodiment 1 or embodiment 2, sampling analysis unit specifically comprises branch chamber 23, PM analyser 24, PM collector 25, ball valve 26, flowmeter 27, sampling pump 28, branch chamber 23 is connected to PM analyser 24 respectively and PM collector 25, PM collector 25 is connected with sampling pump 28 by ball valve 26, flowmeter 27 successively.As shown in Figure 1, as required, PM collector 25 can arrange multiple by branch chamber 23 extraction, arrange 3, and correspondence arranges ball valve 26, flowmeter 27 respectively, is finally connected to sampling pump 28 in the present embodiment.
embodiment 4
The above-mentioned PM2.5 source resolution sampling apparatus based on feedback flow control, described smoke collecting assembly is made up of sampling probe 2, heating sampling feeler lever 5, smoke detectors unit 9, pitot tube 3, pressure difference transmitter 4, sampling probe 2 is positioned in flue 1, sampling probe 2 is connected to the end of heating sampling feeler lever 5, smoke detectors unit 9 is mainly used in monitoring the flue-gas temperature in heating sampling feeler lever 5, and pitot tube 3, pressure difference transmitter 4 can measure flue gas flow rate.
Claims (5)
1. the PM2.5 source resolution sampling apparatus based on feedback flow control, comprise smoke collecting assembly, mixing chamber, PM cutter, sampling analysis unit, it is characterized in that: smoke collecting assembly is connected to mixing chamber, mixing chamber is connected to sampling analysis unit by PM cutter, also comprise second gauge, air supply unit, second gauge arranges and is connected between smoke collecting assembly and mixing chamber, air supply unit comprises air pump, air strainer, surge tank, first proportioning valve, air feeding sensor unit, first-class gauge, air pump is connected to surge tank by air strainer, surge tank is connected to first-class gauge by the first proportioning valve through air feeding sensor unit, first-class gauge is connected to mixing chamber.
2. the PM2.5 source resolution sampling apparatus based on feedback flow control according to claim 1, it is characterized in that: be also provided with the 3rd flowmeter, emptying pipeline and the 4th flowmeter, 3rd flowmeter arranges and is connected between mixing chamber and PM cutter, emptying pipeline is arranged in mixing chamber, is drawn comprise the second proportioning valve, the 4th flowmeter and particulate matter filter successively by mixing chamber.
3. the PM2.5 source resolution sampling apparatus based on feedback flow control according to claim 1, it is characterized in that: sampling analysis unit specifically comprises branch chamber, PM analyser, PM collector, ball valve, flowmeter, sampling pump, branch chamber is connected to PM analyser and PM collector respectively, and PM collector is connected with sampling pump by ball valve, flowmeter successively.
4. the PM2.5 source resolution sampling apparatus based on feedback flow control according to claim 1, it is characterized in that: described smoke collecting assembly is made up of sampling probe, heating sampling feeler lever, smoke detectors unit, pitot tube, pressure difference transmitter, and pitot tube, pressure difference transmitter can measure flue gas flow rate.
5. the PM2.5 source resolution sampling apparatus based on feedback flow control according to claim 1, is characterized in that: in mixing chamber, the residence time of flue gas is no less than 8 seconds, is provided with chamber sensor in mixing chamber.
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Cited By (8)
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| CN105092445A (en) * | 2015-09-10 | 2015-11-25 | 湖南长重机器股份有限公司 | Online monitoring device and method for PM2.5 industrial flue gas |
| CN105158028A (en) * | 2015-07-30 | 2015-12-16 | 北京工业大学 | Stationary-source particle dilution sampling system |
| CN105223046A (en) * | 2015-11-16 | 2016-01-06 | 天津市环境监测中心 | Stationary source flue gas particles dilution method automatic constant speed acquisition method |
| CN107255580A (en) * | 2017-04-26 | 2017-10-17 | 浙江菲达环保科技股份有限公司 | A kind of PM2.5 particles sampling apparatus |
| CN108008082A (en) * | 2017-12-21 | 2018-05-08 | 中冶长天国际工程有限责任公司 | A kind of saliferous gas or SRG gas detecting systems, parsing Tower System and saliferous gas or SRG gas detection methods |
| CN108896710A (en) * | 2018-06-21 | 2018-11-27 | 河南天腾航空科技有限公司 | A kind of unmanned plane Regional Atmospheric Environment monitoring method |
| CN109406229A (en) * | 2018-11-15 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of high-humidity gas fume dilution sampling device and its method of sampling |
| WO2019210718A1 (en) * | 2017-08-18 | 2019-11-07 | 山东诺方电子科技有限公司 | On-board atmospheric pollutant monitoring device |
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| CN108896710A (en) * | 2018-06-21 | 2018-11-27 | 河南天腾航空科技有限公司 | A kind of unmanned plane Regional Atmospheric Environment monitoring method |
| CN109406229A (en) * | 2018-11-15 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of high-humidity gas fume dilution sampling device and its method of sampling |
| CN109406229B (en) * | 2018-11-15 | 2023-08-29 | 华电电力科学研究院有限公司 | High-humidity smoke dilution sampling device and sampling method thereof |
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