CN105136636B - A kind of Atmospheric particulates dehumidification device and method - Google Patents
A kind of Atmospheric particulates dehumidification device and method Download PDFInfo
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Abstract
The present invention relates to a kind of Atmospheric particulates dehumidification device and methods.The Atmospheric particulates dehumidification device includes Nafion pipe Dehumidifying element, particulate matter characterisitic parameter measuring unit, particle purifying unit and aspiration pump.The Atmospheric particulates dehumanization method is based on Nafion pipe dehumidification principle, and the method purged by low pressure high flow rate dry gas removes to the steam in test sample gas, realizes the contactless continuous dehumidifying of the free of losses of Atmospheric particulates.For the cleanliness for guaranteeing purge gas, the present invention first by the way of inertial impaction, removes the partial size in purge gas in the particulate matter of micron dimension；It recycles field-ionization charged and removes the method combined with electrostatic traction, remove the nanoscale fine particle of purge gas.The method that the present invention is also combined using flow-limiting valve with high-power aspiration pump realizes that purge gas pressure is lower than sample gas, to substantially increase the drying efficiency of entire Atmospheric particulates dehumidification device.
Description
Technical field
The present invention relates to atmospheric aerosol monitoring technical fields, and in particular to a kind of Atmospheric particulates dehumidification device and side
Method.
Background technique
In recent years, domestic and international gray haze event takes place frequently, and ozone and fine particle (PM2.5) pollution of high concentration have become current
The main contamination characteristics of atmosphere.With the appearance of national PM2.5 air quality standard, domestic and international all kinds of fine particle quality concentration
Etc. measuring instruments demand increase, but since the difference of relative humidity of atomsphere under varying environment leads to fine particle moisture content itself
Difference, the particulate matter humid control before test become one of the critical issue for influencing Instrument measuring precision, therefore, each instrument manufacturing
Company reduces particulate matter sample air humidity degree using all kinds of methods one after another.
For the humid control of particulate matter, desiccant adsorption and dehumidification or heating and dehumidification are generallyd use.Desiccant is inhaled
Attached dehumidifying, desiccant need to regularly replace, and cannot achieve the long-term non-maintaining operation under unmanned state, simultaneously as steam is
From-inner-to-outer Diffusion moisture absorption, therefore dehumidification efficiency can be gradually reduced with the failure of internal layer desiccant.And for heating and dehumidification,
The environment temperature as locating for the particulate matter of change, while removing moisture removal, can also make particulate matter other it is volatile at
Distribute raw vaporization at high temperature, to influence measurement accuracy.
Chinese invention patent application CN101524617 discloses a kind of method with moisture content in Nafion pipe removal gas,
But the instrument in this method first has to sample gas (processor) being heated to 100-120oC degree, while subsequent gas circuit also needs to connect
Millipore filter, therefore, this method may not apply to the instrument dehumidifying of ambient particle object measuring instrument.Chinese invention patent application
CN103759998A discloses a kind of air dehumidification processes and device, and the atmosphere that will need to dehumidify introduces between dehumidifying inside pipe wall
Dehumidify gas passage, meanwhile, the remaining dry atmosphere after dehumidification pipe dehumidifies flows back into air return plenums, to realize
The circulating repetition application of dry gas.But lead to since the remaining dry atmosphere after dehumidification pipe dehumidifies flows back into gas backstreaming
When in road, do not pass through any particle purifying device, the dry pipe outer wall of internal layer will be contaminated after long-play, to drop
Low drying efficiency；Meanwhile in this operating mode, reflux (purging) throughput is far below atmosphere to be dried, even if solid having
Under conditions of constant-pressure difference, it is also difficult to realize prolonged efficiently dehumidifying.
Summary of the invention
The purpose of the present invention is to provide a kind of Atmospheric particulates dehumidification device and methods, and the dehumidification device and method can
Deficiency in the prior art is solved, dynamic realtime control is carried out to Atmospheric particulates sample air humidity degree, to effectively eliminate environmental wet
Influence of the degree variation to particle monitoring instrument measurement accuracy.
To achieve the above object, the invention adopts the following technical scheme:
A kind of Atmospheric particulates dehumidification device, including Nafion pipe Dehumidifying element, particulate matter characterisitic parameter measuring unit,
Grain object clean unit and aspiration pump.
The Nafion pipe Dehumidifying element includes the inner tube that outer tube is arranged among outer tube with insertion；The outer layer
Purge gass access is formed between inside pipe wall and internal layer pipe outer wall；The upper and lower ends of the outer tube side wall are respectively equipped with and purge gass
The purge gass gas outlet and purge gass air inlet that access is connected, the purge gass gas outlet are connected with the air inlet of aspiration pump
It is logical；The upper and lower ends of the inner tube are respectively equipped with the sample gas air inlet being connected with inside inner tube and sample gas gas outlet, institute
It states sample gas air inlet, inner tube inside and sample gas gas outlet and forms the dry access of sample gas；Sample gas gas outlet and particulate matter
The air inlet pipe of characterisitic parameter measuring unit is connected.
The particle purifying unit includes flow-limiting valve, impacting type particle cutter and electrostatic fine particle remover；It is described
Flow-limiting valve is equipped with primary air inlet, auxiliary gas air inlet and mixed gas outlet；The impacting type particle cutter includes cutter lumen
Body, the acceleration spout being arranged at the top of cutter cavity and the shock being removably mounted on cutter inside cavity bottom surface
Platform；The electrostatic fine particle remover include remover cavity, the electrion needle that remover cavity upper and lower ends are set and
High pressure extraction electrodes, the electrion needle power supply being electrically connected with electrion needle and the high pressure being electrically connected with high pressure extraction electrodes are led
Draw electrode supply；The primary air inlet is connected with the escape pipe of particulate matter characterisitic parameter measuring unit；The auxiliary gas air inlet
Connect outside dry air source；The mixed gas outlet is connected with the inlet end of spout is accelerated；The inlet end for accelerating spout
Positioned at the external side of cutter lumen, outlet side is located at cutter inside cavities and is connected with cutter inside cavity；The cutting
Device cavity is connected on remover cavity wall, and cutter inside cavity is connected with remover inside cavity；The removal
Device cavity bottom side of the wall is equipped with clean gas outlet, and the clean gas outlet is connected with purge gass air inlet.
Further, the particulate matter characterisitic parameter measuring unit uses particulate matter characterisitic parameter measuring instrument or monitor.
The particulate matter characterisitic parameter measuring instrument or monitor include the environmental monitorings such as mass concentration, Size, nephelometer, delustring instrument neck
The common particulate matter measuring instrument in domain.
Further, described that spout is accelerated to include acceleration spray head and the acceleration jet accelerated among spray head is set, it is described
Acceleration jet is inverted cone-shaped.The shock platform is the cylindrical body being coaxially disposed with acceleration jet, and the shock platform screw thread connects
The junction that platform and cutter cavity are hit in the intracorporal bottom of cutter lumen is connect equipped with O-ring seal.
Further, the electrion needle is tungsten needle, and the electrion needle power supply uses negative pressure DC power supply；It is described
High pressure extraction electrodes are the rod iron being arranged with electrion coaxial needle, and one end of the rod iron is mounted on the bottom of remover cavity,
The other end is hemispherical；The high pressure extraction electrodes voltage uses negative pressure DC power supply.
Further, the cutter cavity and remover cavity are all made of aluminum material.
Further, the aspiration pump air pump controllable using air-flow velocity.
The invention further relates to a kind of dehumanization methods of Atmospheric particulates dehumidification device, method includes the following steps:
(1) firstly, sampling air flow is entered by sample gas air inlet, the sample gas in Nafion pipe Dehumidifying element inner tube is dry to be led to
Lu Zhong；Then, in the flow process in the dry access of sample gas, sampling air flow by its steam infiltrate into inner tube and outer tube it
Between purge gass access in purge gass in, complete sampling air flow be dried；Finally, completing the sampling air flow after being dried
Particulate matter characterisitic parameter measuring unit is flowed out to from Nafion pipe Dehumidifying element through sample gas gas outlet；
(2) sampling air flow after Nafion pipe Dehumidifying element is dried is in particulate matter characterisitic parameter measuring unit
Middle progress particulate matter characterisitic parameter measurement, and particle purifying unit is flowed into after completing the measurement of particulate matter characterisitic parameter；
(3) sampling air flow in particle purifying unit is flowed into, together with the secondary air entered by auxilairy air intake, is converged
At purge stream, micron order large particle therein is first removed using the retention of impacting type particle cutter, then use electrostatic particulate
Sub- remover retention removes nanoscale fine particle therein, and finally the air-flow for removing particulate matter is dehumidified by Nafion pipe
The purge gass air inlet of unit enters in purge gass access, carries out sampling air flow moisture absorption processing, and under the driving of aspiration pump
It is discharged by purge gass gas outlet.
Compared to the prior art, the invention has the benefit that
(1) present invention carries out removal moisture drying to sampling air flow using Nafion pipe, by between inner tube and outer tube
Steam in sampling air flow is uninterruptedly discharged purge gass, this can not only increase substantially sample gas dehumidification efficiency, additionally it is possible to solve
The problem of needing to frequently replace desiccant during certainly traditional adsorption and dehumidification.Before the present invention is suitable on all kinds of environmental samplers
Hold free of losses dehumidifying.
(2) whole process of sample gas of the present invention dehumidifying all carries out at room temperature, without to sampling air flow into
Row heating and condensation, to remain the primary characteristic of Atmospheric particulates to the maximum extent.
(3) large particle in sampling air flow after the present invention is dried using the removal of impacting type particle cutter, together
Shi Caiyong electrostatic fine particle remover removes the sampling after being dried in such a way that field-ionization is charged with electrical field draw
Small particle in air-flow makes this so that the clean processing for completing the sampling air flow after being dried obtains clean dried gas
Clean dried gas carries out the moisture absorption processing of sampling air flow as purge gass.In addition, particle purifying list of the present invention
Member uses detachable structure, has the characteristics that later period cleaning and maintenance is convenient, can effectively solve the problem that valence existing for traditional membrane filter
Lattice are expensive, need the problems such as changing replacement frequently.
(4) present invention is combined using flow-limiting valve and active gas source (dry air source accessed from auxilairy air intake)
Mode can be improved the draught head between sampling air flow and purge gass, guarantee that purge gass atmospheric pressure is lower than the air pressure of sampling air flow
Power improves the drying efficiency of Nafion pipe Dehumidifying element.The present invention is on the basis of realizing the dehumidifying of sample gas, after realizing drying
The recycling of sample gas.In the present invention, it even if not accessing dry air source from auxilairy air intake, also can be realized to sample gas
Dehumidifying.
(5) present invention has the characteristics that sample gas compact-sized, easy to maintain, to be applicable not only in the conventional detection of laboratory
Dehumidifying, moreover it is possible to apply the occasions such as prolonged non-maintaining dehumidifying of sample gas under the mal-condition of outfield.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Atmospheric particulates dehumidification device；
Fig. 2 is the structure principle chart of inertial impaction formula particle cutter.
Wherein:
100, Nafion pipe Dehumidifying element, 101, sample gas air inlet, 102, sample gas gas outlet, 103, purge gass air inlet,
104, purge gass gas outlet, 105, inner tube, 106, outer tube, 200, particulate matter characterisitic parameter measuring unit, 300, particulate matter
Clean unit, 301, electrion needle power supply, 302, flow-limiting valve, 303, primary air inlet, 304, auxiliary gas air inlet, 305, gaseous mixture
Outlet, 306, acceleration spout, 307, impacting type particle cutter, 308, shock platform, 309, electrion needle, 310, electrostatic particulate
Sub- remover, 311, high pressure extraction electrodes, 312, clean gas outlet, 400, aspiration pump.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
A kind of Atmospheric particulates dehumidification device as shown in Figure 1, including Nafion pipe Dehumidifying element 100, particulate matter characteristic
Parameter measurement unit 200, particle purifying unit 300 and aspiration pump 400.
Further, the Nafion pipe Dehumidifying element 100 includes that outer tube 106 and insertion are arranged in outer tube 106
Between inner tube 105.The Nafion pipe Dehumidifying element is cylindrical type or plane, and the inner tube 105 is at least 1.It is flat
The Nafion of face type is managed, primarily to increasing the contact area of sample gas and internal layer tube wall, to reduce the length of Nafion pipe
Degree.Purge gass access is formed between 106 inner wall of outer tube and 105 outer wall of inner tube.Above and below 106 side wall of outer tube
Both ends are respectively equipped with the purge gass gas outlet 104 being connected with purge gass access and purge gass air inlet 103, and the purge gass go out
Port 104 is connected with the air inlet of aspiration pump 400.The upper and lower ends of the inner tube 105 be respectively equipped with in inner tube 105
The sample gas air inlet 101 and sample gas gas outlet 102 that portion is connected, the sample gas air inlet 101,105 inside of inner tube and sample
Gas gas outlet 102 forms the dry access of sample gas；Sample gas gas outlet 102 and particulate matter characterisitic parameter measuring unit 200 into
Tracheae is connected.The sample gas air inlet 101, sample gas gas outlet 102, purge gass air inlet 103 and purge gass gas outlet 104 are equal
For hollow cylindrical.
Further, the particulate matter characterisitic parameter measuring unit 200 uses particulate matter characterisitic parameter measuring instrument or monitoring
Instrument.The particulate matter characterisitic parameter measuring instrument or monitor include the environment such as mass concentration, Size, nephelometer, delustring instrument prison
The common particulate matter measuring instrument in survey field.The object of the invention is to the dry particl objects in test sample gas, need to reduce sample gas
Relative humidity provides data to guarantee the accuracy of particulate matter measurement result for meteorology, environmental protection, scientific research etc..
Further, the particle purifying unit 300 includes flow-limiting valve 302, impacting type particle cutter 307 and electrostatic
Fine particle remover 310.
The flow-limiting valve 302 is equipped with primary air inlet 303, auxiliary gas air inlet 304 and mixed gas outlet 305.Specifically,
The primary air inlet 303 is connected with the escape pipe of particulate matter characterisitic parameter measuring unit 200, for realizing the weight of dry waste gas
It is multiple to utilize.The auxiliary gas air inlet 304 connects outside dry air source, real-time for carrying out in 303 tolerance deficiency of primary air inlet
Dynamic supplement.The mixed gas outlet 305 is connected with the inlet end of spout is accelerated, for mixed gas to be delivered to
In impacting type particle cutter 307.It is additionally provided with adjusting knob on the flow-limiting valve 302, for the gas at mixed gas outlet 305
Pressure is controlled.
The impacting type particle cutter 307 includes cutter cavity, the acceleration spout being arranged at the top of cutter cavity
306 and the shock platform 308 that is removably mounted on cutter inside cavity bottom surface.The acceleration spout 306 includes accelerating spray
Head and the acceleration jet being arranged among acceleration spray head；The acceleration jet is inverted cone-shaped, and the acceleration of the inverted cone-shaped is sprayed
The bottom in hole is the circular hole of 0.6mm.By setting acceleration jet to the hole for the inverted cone-shaped that diameter successively becomes smaller, Neng Goushi
The continuous acceleration of existing air-flow.The shock platform 308 is the cylindrical body being coaxially disposed with acceleration jet, and 308 spiral shell of shock platform
Line is connected to the bottom of cutter inside cavities, and the junction for hitting platform 308 and cutter cavity is equipped with O-ring seal.Pass through
Shock platform 308 is removably mounted to the bottom of cutter inside cavities, can remove and provided conveniently for the particulate matter in later period.?
Under constant flow rate, impacting type particle cutter 307 can be realized the retention removal of 1 μm or more large particle.
Fig. 2 is the structure principle chart of impacting type particle cutter, and conventional inertial impaction formula sampling has mainly been used for reference in design
The working principle of device, what is utilized is inertial separation method, and air-flow is after accelerating spray head, due to by the blocking for hitting platform, air-flow
It scatters to surrounding rapidly.In air-flow the lesser particle of partial size due to own momentum it is smaller, it is easy to scatter with air-flow to surrounding；It is right
In the biggish particle of partial size, due to itself biggish momentum, even if when being dispersed by air-flow power effect, but still can not be thorough
Change motion profile, and finally is deposited to and hits on platform.
Fig. 2 is impacting type partial size cutter structure principle chart, and W is acceleration jet diameter in figure, and T is acceleration jet height, S
To accelerate spout 306 and hitting the vertical range of platform 308.In actually calculating, inertial impaction formula particle cutter partial size is determined
The parameter of classification efficiency is, that is, collection efficiency reaches particle size values corresponding when 50%, taken in design process W=T=S=
0.6um when purge gass flow is 0.3L/min, is 0.6um, can effectively remove micron in purge gass at standard conditions
The large particle of grade.Meanwhile when purge gass air-flow becomes larger, since air-flow velocity faster, can be smaller after accelerating.
The electrostatic fine particle remover 310 includes remover cavity, the high pressure that remover cavity upper and lower ends are arranged in
It spray point 309 and high pressure extraction electrodes 311, the electrion needle power supply 301 being electrically connected with electrion needle 309 and is led with high pressure
Draw the high pressure extraction electrodes power supply 313 of the electrical connection of electrode 311.The electrion needle 309 is tungsten needle, in electrion needle power supply
Under 301 drivings, a large amount of free electrons can be generated.The electrion needle power supply 301 uses negative pressure DC power supply, can be realized
Continuously adjusting within the scope of 0 to negative 5000V.The high pressure extraction electrodes 313 are the steel being coaxially disposed with electrion needle 309
Stick, one end of the rod iron are mounted on the bottom of remover cavity, the other end be hemispherical (in Fig. 1, high pressure extraction electrodes it is upper
End is hemispherical).The tip of electrion needle 309 and the hemispherical ends of high pressure extraction electrodes 313 keep insulating safety distances.Pass through
Hemispherical is set by the front end of high pressure extraction electrodes 313, can be avoided the generation of point discharge phenomenon.Affiliated high pressure traction electricity
Pole power supply 313 uses negative pressure DC power supply.The inlet end for accelerating spout 306 is located at the external side of cutter lumen, outlet side position
It is connected in cutter inside cavities and with cutter inside cavity.The cutter cavity is connected to remover cavity wall
On, and cutter inside cavity is connected with remover inside cavity.The remover cavity bottom side of the wall is equipped with purified gas
Outlet 312, the clean gas outlet 312 is connected with purge gass air inlet 103.The cutter cavity and remover cavity are equal
Using aluminum material, and it is grounded.Under the premise of applying discharge voltage and traction voltage, electrostatic fine particle remover be can be realized
Retention down to nanoscale fine particle removes.Specific removal process is as follows: when electrion needle power supply 301 works normally
When, electrion needle 309 can generate a large amount of free electron and discharge to surrounding space, high density electron cloud region is formed, when
It is loaded with when purging air through the region of particulate matter, due to the collision and electrostatic adsorption between particulate matter and free electron,
Particulate matter can take negative electrical charge moment.And when the normal work of high pressure extraction electrodes power supply 313, before high pressure extraction electrodes 311
End is hemispherical, can only generate stable electric field region in its surrounding space, after the particulate matter with charge reaches electric field region,
Under the action of electric field force, moved toward towards 310 wall of electrostatic fine particle remover, and be deposited on wall.Experimental analysis shows
After impacting type particle cutter 307 and electrostatic fine particle remover 310 purify, 10nm or more particulate matter is all gone substantially
It removes.
Further, the aspiration pump 400 air pump controllable using air-flow velocity.
The invention further relates to a kind of dehumanization methods of Atmospheric particulates dehumidification device, method includes the following steps:
(1) firstly, sampling air flow is entered by sample gas air inlet 101 in the inner tube 105 of Nafion pipe Dehumidifying element 100
In the dry access of sample gas.Then, in the flow process in the dry access of sample gas, its steam is infiltrated into inner tube by sampling air flow
In the purge gass in purge gass access between 105 and outer tube 106, completes sampling air flow and be dried；Finally, completing drying
Treated sampling air flow flows out to the measurement of particulate matter characterisitic parameter from Nafion pipe Dehumidifying element 100 through sample gas gas outlet 102
Unit 200.In the present invention, the sample gas is sampling air flow.
(2) sampling air flow after Nafion pipe Dehumidifying element 100 is dried is measured in particulate matter characterisitic parameter
The measurement of particulate matter characterisitic parameter is carried out in unit 200, and flows into particle purifying after completing the measurement of particulate matter characterisitic parameter
Unit 300.Gas after the measurement of particulate matter characterisitic parameter is recycled as purge gass, is converged into together with secondary air
Purge stream is passed through together into particle purifying unit 300, to increase the psychrometric difference between purge gass and sample gas, Jin Erneng
Enough improve the drying efficiency of entire Atmospheric particulates dehumidification device.
(3) sampling air flow after being dried of the escape pipe outflow of particulate matter characterisitic parameter measuring unit 200, from master
Air inlet 303 flows into flow-limiting valve 302.Simultaneously to guarantee that purge gass flow is higher than the flow to test sample gas, from additional-air inlet
Mouth 304 is passed through a part of dry air into flow-limiting valve 302.In flow-limiting valve 302, the drying entered from primary air inlet 303 is adopted
Sample air-flow and the dry air entered from auxilairy air intake 304 after mixing, form the purge gass for having particulate matter.With
The purge gass of grain object are through mixed gas outlet 305 and spout 306 is accelerated to enter in impacting type particle cutter 307.Accelerated spray
After mouth 306, the micron order large particle in purge gass, which is trapped within, hits in platform 308, other nanoscale fine particles are with purging
Gas enters in electrostatic fine particle remover 310.In electrostatic fine particle remover 310, in electrion needle 309, electrion
Under the collective effect of needle power supply 301, particulate matter moment in purge gass completes charged process, then high pressure extraction electrodes 311,
Under the collective effect of high pressure extraction electrodes power supply 313, the nano-scale particle moment charged in purge gass is towed to interior dispatch from foreign news agency
Pole surface, to complete the removal of nano-scale particle in purge gass.The purge gass with particulate matter are net by particulate matter as a result,
Change unit after, entrained by particulate matter it is substantially all removed, so as to avoid the dirt to Nafion pipe Dehumidifying element 100
Dye.Purified purge gass enter in Nafion pipe Dehumidifying element 100 by purge gass air inlet 103, and are full of inner tube 105
In the intermediate region formed with outer tube 106, the moisture absorption processing of sampling air flow is carried out, then under the action of aspiration pump, by blowing
Nafion pipe Dehumidifying element 100 is left in scavenging gas outlet 104, and is discharged by aspiration pump 400.The present invention passes through setting aspiration pump
400, purge gass air-flow can be made to be greater than to test sample gas, so that more vapour molecules are taken away within the set time, and flow-limiting valve
302 introducing can realize that the purge gass air pressure of valve body rear is lower than to test sample gas while realizing that gas tentatively mixes, according to
Nafion pipe working principle, draught head is introduced into the transport velocity that will greatly speed up hydrone in Nafion pipe, to improve
The drying efficiency of entire Atmospheric particulates dehumidification device.
In conclusion Atmospheric particulates dehumidification device of the present invention and method are to be based on Nafion pipe dehumidification principle,
The method purged by low pressure high flow rate dry gas removes to the steam in test sample gas, realizes the lossless of Atmospheric particulates
Lose contactless continuous dehumidifying.For the cleanliness for guaranteeing purge gas, first by the way of inertial impaction, removal purges the present invention
The particulate matter of partial size in gas in micron dimension；It recycles field-ionization charged and removes the method combined with electrostatic traction,
Remove the nanoscale fine particle of purge gas.The method that the present invention is also combined using flow-limiting valve with high-power aspiration pump,
Realize that purge gas pressure is lower than sample gas, to substantially increase the drying efficiency of entire Atmospheric particulates dehumidification device.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (6)
1. a kind of Atmospheric particulates dehumidification device, it is characterised in that: surveyed including Nafion pipe Dehumidifying element, particulate matter characterisitic parameter
Measure unit, particle purifying unit and aspiration pump；
The Nafion pipe Dehumidifying element includes the inner tube that outer tube is arranged among outer tube with insertion；In the outer tube
Purge gass access is formed between wall and internal layer pipe outer wall；The upper and lower ends of the outer tube side wall are respectively equipped with and purge gass access
The purge gass gas outlet being connected and purge gass air inlet, the purge gass gas outlet are connected with the air inlet of aspiration pump；Institute
The upper and lower ends for stating inner tube are respectively equipped with the sample gas air inlet being connected with inside inner tube and sample gas gas outlet, the sample gas
Inside air inlet, inner tube and sample gas gas outlet forms the dry access of sample gas；Sample gas gas outlet and particulate matter characteristic are joined
The air inlet pipe of number measuring unit is connected；
The particle purifying unit includes flow-limiting valve, impacting type particle cutter and electrostatic fine particle remover；The current limliting
Valve is equipped with primary air inlet, auxiliary gas air inlet and mixed gas outlet；The impacting type particle cutter includes cutter cavity, sets
The shock platform setting the acceleration spout at the top of cutter cavity and being removably mounted on cutter inside cavity bottom surface；It is described
Electrostatic fine particle remover includes remover cavity, the electrion needle that remover cavity upper and lower ends are arranged in and high pressure traction
Electrode, the electrion needle power supply being electrically connected with electrion needle and the high pressure extraction electrodes electricity being electrically connected with high pressure extraction electrodes
Source；The primary air inlet is connected with the escape pipe of particulate matter characterisitic parameter measuring unit；The auxiliary gas air inlet connects external dry
Dry air-source；The mixed gas outlet is connected with the inlet end of spout is accelerated；The inlet end for accelerating spout is located at cutting
On the outside of device cavity, outlet side is located at cutter inside cavities and is connected with cutter inside cavity；The cutter cavity connects
It connects on remover cavity wall, and cutter inside cavity is connected with remover inside cavity；Under the remover cavity
End side wall is equipped with clean gas outlet, and the clean gas outlet is connected with purge gass air inlet；
Described that spout is accelerated to include acceleration spray head and the acceleration jet accelerated among spray head is arranged in, the acceleration jet is rounding
Cone cell；
The shock platform is the cylindrical body being coaxially disposed with acceleration jet, and the shock platform is threaded in cutter lumen body
Bottom, and the junction for hitting platform and cutter cavity is equipped with O-ring seal.
2. a kind of Atmospheric particulates dehumidification device according to claim 1, it is characterised in that: the particulate matter characterisitic parameter
Measuring unit uses particulate matter characterisitic parameter measuring instrument or monitor.
3. a kind of Atmospheric particulates dehumidification device according to claim 1, it is characterised in that: the electrion needle is tungsten
Needle, the electrion needle power supply use DC power supply；The high pressure extraction electrodes are the steel being arranged with electrion coaxial needle
Stick, one end of the rod iron are mounted on the bottom of remover cavity, and the other end is hemispherical.
4. a kind of Atmospheric particulates dehumidification device according to claim 1, it is characterised in that: the cutter cavity with go
Except device cavity is all made of aluminum material.
5. a kind of Atmospheric particulates dehumidification device according to claim 1, it is characterised in that: the aspiration pump uses air-flow
The controllable air pump of flow velocity.
6. a kind of dehumanization method of Atmospheric particulates dehumidification device according to claim 1, it is characterised in that: this method packet
Include following steps:
(1) firstly, sampling air flow is entered in the dry access of the sample gas in Nafion pipe Dehumidifying element inner tube by sample gas air inlet；
Then, in the flow process in the dry access of sample gas, sampling air flow infiltrates into its steam between inner tube and outer tube
In purge gass in purge gass access, completes sampling air flow and be dried；Finally, completing the sampling air flow after being dried through sample
Gas gas outlet flows out to particulate matter characterisitic parameter measuring unit from Nafion pipe Dehumidifying element；
(2) sampling air flow after Nafion pipe Dehumidifying element is dried in particulate matter characterisitic parameter measuring unit into
The measurement of row particulate matter characterisitic parameter, and particle purifying unit is flowed into after completing the measurement of particulate matter characterisitic parameter；
(3) sampling air flow in particle purifying unit is flowed into, together with the secondary air entered by auxilairy air intake, converges into and blows
Scavenging stream is first removed micron order large particle therein using the retention of impacting type particle cutter, then is gone using electrostatic fine particle
Except device retention removes nanoscale fine particle therein, the air-flow for removing particulate matter is finally passed through into Nafion pipe Dehumidifying element
Purge gass air inlet enter in purge gass access, sampling air flow moisture absorption processing is carried out, and by blowing under the driving of aspiration pump
The discharge of scavenging gas outlet.
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| US10078043B2 (en) * | 2016-03-08 | 2018-09-18 | Ford Global Technologies, Llc | Method and system for exhaust particulate matter sensing |
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