CN104729890B - A kind of PM2.5 source resolution sampling apparatuses based on feedback flow control - Google Patents
A kind of PM2.5 source resolution sampling apparatuses based on feedback flow control Download PDFInfo
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Abstract
The present invention relates to enviromental monitoring equipment field, particularly a kind of PM2.5 source resolution sampling apparatuses based on feedback flow control, including smoke collecting component, mix chamber, PM cutters, sampling analysis unit, smoke collecting component is connected to mixing chamber, mixing chamber is connected to sampling analysis unit by PM cutters, also include second flowmeter, air supply unit, second flowmeter, which is set, to be connected between smoke collecting component and mixing chamber, air supply unit includes air pump, air cleaner, surge tank, first proportioning valve, air feeding sensor unit, first flowmeter, air pump is connected to surge tank by air cleaner, surge tank is connected to first flowmeter by the first proportioning valve through air feeding sensor unit, first flowmeter is connected to mixing chamber.This patent can improve processing, manufacture difficulty reduces, and cost is relatively low, easy to spread using traditional stationary source sample mode on existing product.
Description
Technical field
The present invention relates to enviromental monitoring equipment field, one kind is directed to particle from fixed combustion source emission sampling system, especially
It is the special equipment for gathering PM2.5.
Background technology
PM2.5 is the fine particle in a kind of inhalable lung, and its diameter is less than 2.5 microns, and it accounts for inhalable particles
The 80% of thing PM10.And a large amount of particulate matters can be produced in fossil fuel combustion process, and it is directly discharged in air, can harmful to human
Health, cause atmosphere pollution and destroy PM2.5 fine particles in ecological environment, particularly flue gas, can stop for a long time in an atmosphere
Stay, bigger to health and atmosphere environment impact, prior art is concentrated mainly on to be removed to what PM2.5 fine particles were handled
How dirt, practical application effect have no clear and definite test data on earth, and this is related to stationary source PM2.5 sampling analyses
Technology.
PM2.5 sampling apparatuses generally comprise flue gas induction part, diluent air part, dilution mixing portion and sampling unit
Point, wherein diluent air part and dilution mixing portion is the device for realizing flue gas and air mixing, and the purpose is to simulated flue gas
From floss hole come out after and air mixed process, it is discharge of pollutant sources particulate matter in air that the particulate matter of trapping, which can be approximately considered,
In time of day, its key is to control the thinner ratio of flue gas and surrounding air.
Currently used method is such as the patent No. by the way that diluent air admission line connection flow gauge is realized
200510086292.6 patent of invention be related to diluting and sampling system for particle from fixed combustion source emission, including flue gas intake section
Point, one-level dilution system, two-stage dilution system, chamber and sampling unit grade, the invention passes through porous dilution effects and injection
The two-stage dilution system being combined is diluted, strengthens the mixing of flue gas and air.Because the flue gas flow of flue has fluctuation, especially
When flowed fluctuation is bigger, is not adjusted to air mass flow and in time, directly affect the precision of measurement；It is meanwhile high
The air mixing of the flue gas and normal temperature of temperature, mixed volume and can also have certain change, cause measurement result to occur partially
Difference, thus the sampling apparatus of this structure can not realize the accurate control to thinner ratio.In sampling system, two-way sampling difference
It is connected with chamber thieff hatch, is formed by cutter, sampling film, regulating valve, spinner flowmeter, sampling pump, though this structure
The particulate matter of different-diameter can be so sampled, but sampling channel is less, is unfavorable for analyzing the various composition in particulate matter, together
When, the repetition of various devices has detrimental effect to the layout, the utilization rate of equipment, the outward appearance of equipment of device interior.
The content of the invention
Technical problems to be solved
It is single for flue gas sampling mode present in prior art, it can not accurately control thinner ratio, and then simulating pollution
The problem of source emission particulate matter time of day in an atmosphere, the invention provides a kind of PM2.5 based on feedback flow control
Source resolution sampling apparatus, it can realize the emulation of accurate sampling and particulate matter aging.
Technical scheme
The purpose of the present invention is achieved through the following technical solutions.
A kind of PM2.5 source resolution sampling apparatuses based on feedback flow control, including smoke collecting component, mixing stop
Room, PM cutters, sampling analysis unit, smoke collecting component are connected to mixing chamber, and mixing chamber passes through PM cutters
Sampling analysis unit, in addition to second flowmeter, air supply unit are connected to, second flowmeter sets and is connected to smoke collecting
Between component and mixing chamber, it is defeated that air supply unit includes air pump, air cleaner, surge tank, the first proportioning valve, air
Sensor unit, first flowmeter are sent, air pump is connected to surge tank by air cleaner, and surge tank is passed through by the first proportioning valve
Air feeding sensor unit is connected to first flowmeter, and first flowmeter is connected to mixing chamber.
The above-mentioned PM2.5 source resolution sampling apparatuses based on feedback flow control, are additionally provided with the 3rd flowmeter, evacuated tube
Road and the 4th flowmeter, the 3rd flowmeter, which is set, to be connected between mixing chamber and PM cutters, and emptying pipeline is arranged on mixed
Close in chamber, drawn by mixing chamber includes the second proportioning valve, the 4th flowmeter and particulate matter filter successively.
The above-mentioned PM2.5 source resolution sampling apparatuses based on feedback flow control, sampling analysis unit specifically include shunting
Chamber, PM analyzers, PM collectors, ball valve, flowmeter, sampling pump, branch chamber are respectively connecting to PM analyzers and PM collectors, PM
Collector passes sequentially through ball valve, flowmeter and sampling pump and connected.
The above-mentioned PM2.5 source resolution sampling apparatuses based on feedback flow control, described smoke collecting component is by sampling
Probe, heating sampling feeler lever, smoke detectors unit, Pitot tube, pressure difference transmitter composition, Pitot tube, pressure difference transmitter can
Measure flue gas flow rate.
The above-mentioned PM2.5 source resolution sampling apparatuses based on feedback flow control, when mixing the stop of flue gas in chamber
Between be no less than 8 seconds, mix chamber in be provided with monitoring sensor.
Beneficial effect
Compared to prior art, the advantage of the invention is that：
1st, this patent can improve processing on existing product, make using traditional stationary source sample mode
Difficulty reduces, and cost is relatively low, easy to spread.
2nd, in this patent, diluent gas enters through air pump, enters through air cleaner, removes the influence in diluent gas
The factor, guarantee use accuracy, meanwhile, install first flowmeter additional, diluting gas flow is controlled, realizes the essence of thinner ratio
Really control.In this patent, surge tank is set after air cleaner, before the first proportioning valve, play it is stable flow through it is first-class
The effect of gauge air-flow, solve the problems, such as that air pump is unstable through air-flow caused by air cleaner.This patent can be according to each
The parameter of flowmeter and detection unit, by adjusting the aperture regulation diluent air air inflow of proportioning valve, suitable for flue gas constant speed
Environment is sampled, reaches the purpose of accurate control thinner ratio.
3rd, because fixed source smoke discharge has the processes such as nucleation, cohesion, aging into air, diluted sample gas, which enters, to stop
Room is stayed to need the regular hour to stable.Increase flow regulating unit, main proportional valve, venturi stream in the outlet of chamber
Gauge, highefficiencyparticlefilter composition.Controller stops the flow of indoor gas according to measurement, and real-time automatic control flow is adjusted
The proportioning valve of unit is saved, controls the flow of flow regulating unit, not only causes diluted sample gas to be stopped from chamber is flowed into outflow
Time is controllable, and enters the stability of flow of PM cutters, ensures the reliable of sample.
4th, the present invention sets up the three, the 4th flowmeters in chamber end, by chamber sensor to parameter therein
Monitored in real time, and adjust the amount of chamber eluting gas, selected appropriate sampling flow and emptying flow, both ensure that and stopped
The time is stayed, while excessively will not stop gas in chamber, keeps the pressure stability of system, improves sampling precision.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
In figure：1st, flue, 2, sampling probe, 3, Pitot tube, 4, pressure difference transmitter, 5, heating sampling inserting tube, 6, the
Two flowmeters, 7, dilution trap, 8, chamber, 9, smoke detectors unit, 10, first flowmeter, 11, air feeding sensor list
Member, the 12, first proportioning valve, 13, high efficiency particle thing filter, 14, active carbon filter, 15, air pump, 16, surge tank, 17, stop
Stay room sensor, the 18, the 3rd flowmeter, 19, PM cutters, the 20, second proportioning valve, the 21, the 4th flowmeter, 22, particulate matter mistake
Filter, 23, branch chamber, 24, PM analyzers, 25, PM collectors, 26, ball valve, 27, flowmeter, 28, sampling pump, 29, control it is single
Member.
Embodiment
With reference to 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 apparatuses based on feedback flow control of the present embodiment, including flue gas are adopted
Collect component, mixing chamber, PM cutters 19, sampling analysis unit.
Smoke collecting component is the unit for gathering flue gas, is set directly in the pipeline of pollution sources, gathers the cigarette in pipeline
Gas；Mixing chamber is the region that flue gas and diluent gas are mutually mixed and stopped, and specifically includes dilution trap 7 and chamber 8, dilute
Release and be interconnected between groove 7 and chamber 8, smoke collecting component is connected to dilution trap 7, and chamber 8 passes through PM cutters 19 again
It is connected to sampling analysis unit.
Also include second flowmeter 6, air supply unit in the present embodiment, the setting of second flowmeter 6 is connected to flue gas and adopted
Collect between component and dilution trap 7, air supply unit include air pump 15, air cleaner, surge tank 16, the first proportioning valve 12,
Air feeding sensor unit 11, first flowmeter 10, air cleaner can be according to selection be actually needed, and the present embodiment employs
The arrangement that active carbon filter 14 and high efficiency particle thing filter 13 are connected, air pump 15 pass through active carbon filter 14 and height
Effect particulate matter filter 13 is connected to surge tank 16, and surge tank 16 is by the first proportioning valve 12 through air feeding sensor unit 11
First flowmeter 10 is connected to, first flowmeter 10 is connected to dilution trap 7.Said structure can convey air pump 15 in the gas come
Body, realize that impurity removes through air cleaner, be then sent to dilution trap and flue gas is mixed, so as to reach the mesh of dilution
, second flowmeter 6, first flowmeter 10 can carry out accurate perception to the inlet of flue gas, diluent gas respectively, when second
, can be by adjusting the modes such as the aperture of 15 and first proportioning valve of air pump 12, in first flowmeter after flowmeter 6 feeds back flue gas flow
10 obtain required flow, so as to realize the accurate control of thinner ratio, meanwhile, air feeding sensor unit 11 can also be to dilution
The temperature of gas, air pressure are monitored.
Generally ensure that flue gas and the mixed effect of diluent gas and nucleation, cohesion, the plan of ageing process of particulate matter are true,
The residence time for mixing flue gas in chamber is typically no less than 8 seconds, mixes in chamber and is provided with chamber sensor 17, specifically
For temperature sensor and pressure sensor, temperature, the pressure condition in chamber 8 can be monitored at any time.
Embodiment 2
As the further scheme of embodiment 1, in the present embodiment, be additionally provided with the 3rd flowmeter 18, emptying pipeline and
4th flowmeter 21, the 3rd flowmeter 18 set and are connected between chamber 8 and PM cutters 19, evacuated tube route chamber 8
Draw, emptied after being sequentially connected the second proportioning valve 20, the 4th flowmeter 21 and particulate matter filter 22.
The present embodiment set the 3rd flowmeter 18, the 4th flowmeter 21 with realize chamber 8 export gas flow can be accurate
Monitoring, because the PM in flue gas deposits aerial problem of aging, and can be according to different sample requirement need in sampling process
Otherwise same Accurate Data Flow Control, once the flow into chamber 8 is more than sampling flow, the pressure of chamber 8 can be caused to increase,
So as to cause system pressure to increase, intake resistance increase, influence to gather the work of the unit of flue gas, and then thinner ratio control occurs
Error, influence sampling precision.And emptying pipeline is added in this implementation, can be according to different samplings so as to strengthen system adaptability
Sampling flow is adjusted flexibly in demand, and adaptability is stronger.
Preferably to realize automation, control unit 29 can be increased, control unit by wired or wireless mode with
Device connection control, flue gas flow rate is measured by Pitot tube 3, pressure difference transmitter 4, flue gas is measured by smoke detectors unit 9
Temperature, air pressure, temperature, the air pressure of diluent gas are measured by air feeding sensor unit 11, according to the cigarette of mixing chamber
Gas, the temperature of diluent gas, pneumatic parameter and required thinner ratio, charge flow rate is calculated respectively, and pass through the first proportioning valve 12
The inlet of diluent gas is adjusted, so as to the thinner ratio for coordinating the amount of flue gas to reach required.The process can be that dynamic adjusts
Process, meanwhile, monitoring regulation situation is implemented by chamber sensor 17.
Embodiment 3
In the present embodiment, anterior separation structure is identical with embodiment 1 or embodiment 2, and sampling analysis unit specifically includes shunting
Chamber 23, PM analyzers 24, PM collectors 25, ball valve 26, flowmeter 27, sampling pump 28, branch chamber 23 are respectively connecting to PM analyses
Instrument 24 and PM collectors 25, PM collectors 25 pass sequentially through ball valve 26, flowmeter 27 is connected with sampling pump 28.As shown in figure 1, root
According to needs, PM collectors 25 can be drawn by branch chamber 23 sets multiple, setting 3 in the present embodiment, and is correspondingly arranged respectively
Ball valve 26, flowmeter 27, are finally coupled to sampling pump 28.
Embodiment 4
The above-mentioned PM2.5 source resolution sampling apparatuses based on feedback flow control, described smoke collecting component is by sampling
Probe 2, heating sampling feeler lever 5, smoke detectors unit 9, Pitot tube 3, pressure difference transmitter 4 form, and sampling probe 2 is positioned over cigarette
In feed channel 1, sampling probe 2 is connected to the end of heating sampling feeler lever 5, and smoke detectors unit 9 is mainly used in monitoring heating
Flue-gas temperature in sampling feeler lever 5, Pitot tube 3, pressure difference transmitter 4 can measure flue gas flow rate.
Claims (4)
1. a kind of PM2.5 source resolution sampling apparatuses based on feedback flow control, including smoke collecting component, mixing chamber,
PM cutters, sampling analysis unit, it is characterised in that：Smoke collecting component is connected to mixing chamber, and mixing chamber passes through
PM cutters are connected to sampling analysis unit, in addition to second flowmeter, air supply unit, and second flowmeter sets and is connected to
Between smoke collecting component and mixing chamber, air supply unit includes air pump, air cleaner, surge tank, the first ratio
Valve, air feeding sensor unit, first flowmeter, air pump are connected to surge tank by air cleaner, and surge tank passes through
One proportioning valve is connected to first flowmeter through air feeding sensor unit, and first flowmeter is connected to mixing chamber；Also set
The 3rd flowmeter, emptying pipeline and the 4th flowmeter are equipped with, the 3rd flowmeter, which is set, is connected to mixing chamber and PM cutters
Between, emptying pipeline is arranged in mixing chamber, and drawn by mixing chamber includes the second proportioning valve, the 4th flowmeter successively
And particulate matter filter.
2. the PM2.5 source resolution sampling apparatuses according to claim 1 based on feedback flow control, it is characterised in that：Adopt
Sample analytic unit specifically includes branch chamber, PM analyzers, PM collectors, ball valve, flowmeter, sampling pump, and branch chamber connects respectively
To PM analyzers and PM collectors, PM collectors pass sequentially through ball valve, flowmeter and sampling pump and connected.
3. the PM2.5 source resolution sampling apparatuses according to claim 1 based on feedback flow control, it is characterised in that：Institute
The smoke collecting component stated is made up of sampling probe, heating sampling feeler lever, smoke detectors unit, Pitot tube, pressure difference transmitter,
Pitot tube, pressure difference transmitter can measure flue gas flow rate.
4. the PM2.5 source resolution sampling apparatuses according to claim 1 based on feedback flow control, it is characterised in that：It is mixed
The residence time for closing flue gas in chamber is no less than 8 seconds, mixes in chamber and is provided with chamber sensor.
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| CN105158028B (en) * | 2015-07-30 | 2018-04-03 | 北京工业大学 | A kind of stationary source diluting and sampling system for particle |
| CN105092445B (en) * | 2015-09-10 | 2018-04-20 | 湖南长重机器股份有限公司 | A kind of on-Line Monitor Device and its method of PM2.5 industrial smokes |
| 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 |
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| CN108008082B (en) * | 2017-12-21 | 2023-11-10 | 中冶长天国际工程有限责任公司 | Salt-containing gas or SRG gas detection system, analytic tower system and salt-containing gas or SRG gas detection method |
| 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 |
| 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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