CN106000484A - Photochemical simulation smog chamber - Google Patents
Photochemical simulation smog chamber Download PDFInfo
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- CN106000484A CN106000484A CN201610551465.5A CN201610551465A CN106000484A CN 106000484 A CN106000484 A CN 106000484A CN 201610551465 A CN201610551465 A CN 201610551465A CN 106000484 A CN106000484 A CN 106000484A
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- air
- smog
- smog chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
Abstract
The invention discloses a photochemical simulation smog chamber which comprises a smog chamber body, wherein a plurality of air exchange holes are formed in the outer wall of the smog chamber body; an air monitoring part consisting of a plurality of monitoring probes is arranged on the smog chamber body; a light source part consisting of an internal light source is arranged inside the smog chamber body; the smog chamber body is connected with a reaction air allocation part for introducing air and a dynamic air exchange washing part for discharging out air inside the smog chamber body and introducing external air; under the action of the power of a washing fan, internal air is discharged out from screwed cover type air exchange holes in the top and the right side of the smog chamber body; the air is pressed by using a nitrogen dioxide allocation tank, a hydrocarbon compound air allocation tank and the like on the left side, and is guided into the smog chamber body through a stainless steel pipe; the concentration of the air inside the smog chamber body is monitored and recorded on line by using an on-line monitoring probe arranged at the top of the smog chamber body. The photochemical simulation smog chamber is designed in an assembling and disassembling manner, small in space and convenient to move; as the outer wall of the smog chamber body is made of a PMMA inert material, the photochemical simulation smog chamber is large in strength, low in cost and small in wall consumption adsorption; due to adoption of a light source, the photochemical simulation smog chamber is small in light loss, high in utilization rate, small in power and safe and reliable, and moreover is short in reaction cycle and high in efficiency.
Description
Technical field
The invention belongs to teaching experimental equipment technical field, particularly toA kind of photochemistry simulation cigarette fog chamber。
Background technology
Photochemical fog is huge to the harm of plant, human body.It has without territory, borderless, the features such as hazardness is big, persistent period length.The research direction of photochemical fog has at present: field measurement, photochemical kinetics study mechanism and numerical simulation.Photochemical fog case is the research direction of simulation study photochemical fog.
The development first of photochemical fog case is beautiful in twentieth century five sixtiesState northCaro comes the UNC smog box of that university, volume 156m3.Domestic only smog box only has corresponding equipment in Tsing-Hua University, Beijing University and the Chinese Academy of Sciences, and the example being applied to teaching is almost nil.
The research to large-scale smog box abroad is compared early, beautifulState northCaro carrys out the UNC smog box volume 156m of that university3, the EUPHORE smog box etc. of the UCR smog box in branch school, California, USA university river bank and Spain Valencia be all 100m3Above volume, but structure complexity is difficult to carrying, cost is high, floor space is big, detection program is complicated, reaction time is long.
Summary of the invention
In order to overcome the point of above-mentioned prior art, serving for the teaching and scientific research, it is an object of the invention to provideA kind of photochemistry simulation cigarette fog chamber, volume is little, low cost, and reaction time is short, and reaction efficiency is high, and gas detecting is convenient and swift, the most accurately, it is possible to meet scientific research and teaching request.
To achieve these goals, the technical solution used in the present invention is:
A kind of photochemistry simulation cigarette fog chamberIncluding smog casing, some air-vent 1-2 it are provided with on the outer wall 1-1 of smog casing, the gas monitoring portion being made up of some monitoring probe 2-1 it is provided with on smog casing, smog casing is provided with the light source part being made up of built-in light source 5-1, smog casing connect the reaction distribution part having for importing gas and in discharging case gas and import the dynamic ventilation cleaning part of extraneous gas.
The rigidity cuboid that described smog casing is made up of 6 pieces of PMMA plates, volume 200L, floor space is little, conveniently moving.Outer wall materials is PMMA, proves that the wall of PMMA material for gaseous damages absorption through test of many times little, it is adaptable to the requirement of experiment of the present invention.Air-vent 1-2 is respectively provided at the top of outer wall 1-1, front end, two side portions, and in case, gas is discharged through air-vent 1-2.Specifically, the top of described outer wall 1-1 is provided with the air-vent 1-2 of 5 single file arrangements, is spaced apart 120mm；The left and right sides is respectively provided with the air-vent 1-2 of 5 single-row arrangements, is spaced apart 120mm, and the left and right sides with a line air-vent 1-2 in the same horizontal line；Front end is provided with the air-vent 1-2 of 3 single file arrangements, is spaced apart 200mm.
Described monitoring probe 2-1 is by including O3、NO2、NO、VOC、CO2, CO, aldehydes monitoring probe etc. at interior some probe compositions, embed the fixing acupuncture point at casing top, component gas each in casing carried out direct-reading record, resolution reaches ppb, simple and efficient, the most in real time, the most accurate.Four probes are placed in the top of smog casing, and registration is both facing to dead ahead, it is simple to reading.Specifically, four probes are in two row two column distributions, and laying respectively at a length of side is on foursquare four summits of 200mm.
Described reaction distribution part includes stroke valve 3-2, stainless steel pipe 3-3, presides over bearing 3-4 and two distribution tank 3-1, reacting gas is by distribution tank 3-1 dispensing, control gas flow through stroke valve 3-2, then by the aluminum alloy conduit 3-3 being connected from stroke valve 3-2, the gas of different distribution tank 3-1 is imported in smog box body.
Described dynamic ventilation cleaning part divides and includes supply fan 4-1 and the fan 4-2 that gives vent to anger, and the residual gas in casing is provided power to discharge from air-vent 1-2 by the fan 4-2 that gives vent to anger, and extraneous gas is passed through by supply fan 4-1.
Described supply fan 4-1 and the fan 4-2 that gives vent to anger is arranged in the cap-rotating type circular port of a diameter of 100mm, and supply fan 4-1 is directly over the fan 4-2 that gives vent to anger at 180mm.
Described built-in light source 5-1 is the black light lamp of 300～400nm, and top in smog box body hangs 2, in the air-vent 1-2 of the left and right sides or top is placed with several.Built-in light source 5-1 simulated solar optical wavelength, the loss of light efficiency height is few, can realize photochemistry quick effect, safely controllable reality in 100w.
Compared with prior art, smog box of the present invention uses collection built-in light source, distribution, regulates, monitors the integral structure with smog box, and volume is little, low cost, and reaction time is fast, can single manipulate.It is applicable to undergraduate course experiment.Employing disassembled type designs, and floor space is little, conveniently moving, and cabinet exterior used is with PMMA inert material, and intensity is the most economic and practical, and it is little that wall damages absorption.Built-in light source light loss is little, and utilization rate is high, and small-power is safe and reliable, and reaction time is short, and efficiency is high.Solve existing smog box large space, peripheral multiple sets of light sources, fixed, ventilation cycle length, high in cost of production practicality present situation.
Accompanying drawing explanation
Figure 1It is that the master of device regardsFigure。
Figure 2It it is the side-looking of deviceFigure。
Figure 3It it is the vertical view of deviceFigure。
Figure 4It is supply fan and fan side-looking of giving vent to angerFigure。
Figure 5It is supply fan and fan vertical view of giving vent to angerFigure。
Figure 6It is that air-vent master regardsFigure。
Figure 7It is that air-vent is overlookedFigure。
Figure 8It it is the curve of ozone of the present invention testFigure。
Figure 9It it is the curve of VOC of the present invention testFigure。
Detailed description of the invention
Below in conjunction withAccompanying drawingEmbodiments of the present invention are described in detail with embodiment.
Such as figure 1 、 2, shown in 3, photochemical fog case of the present invention, clean part and light source, wherein including smog casing, gas monitoring portion, reaction distribution part, dynamic ventilation:
Such as figure 1 、 2, 3,4,5,6, shown in 7, cap-rotating type air-vent 1-2 is respectively provided at the top of outer wall 1-1 of smog casing, front end, two side portions.Wherein top is provided with 5, and single file is arranged, and is spaced apart 120mm；The left and right sides is respectively provided with 5, single-row setting, is spaced apart 120mm, and left and right level of relative one by one, and its object is to can be in left and right sides air-vent horizontal positioned lateral sources；Front end is provided with 3, and single file is arranged, and is spaced apart 200mm.Gas monitoring portion such as 4 monitoring probe 2-1, is O respectively3Monitoring probe, NO2Monitoring probe, NO monitoring probe, VOC monitor probe, 4 probes are positioned at front two rows, dynamic ventilation cleaning part includes supply fan 4-1 and fan 4-2 two parts of giving vent to anger altogether, residual gas in casing is provided power to discharge from cap-rotating type air-vent 1-2 by the fan 4-2 that gives vent to anger, and outside ventilation body is passed through by supply fan 4-1.
Reaction distribution part includes stroke valve 3-2, aluminum alloy conduit 3-3, supports bearing 3-4 and two distribution tank 3-1, two distribution tank 3-1 are respectively nitrogen dioxide distribution tank and Hydrocarbon distribution tank, reacting gas is by distribution tank 3-1 dispensing, control gas flow through stroke valve 3-2, then by the aluminum alloy conduit 3-3 being connected from stroke valve 3-2, the gas of different distribution tank 3-1 is imported in smog box body.
The present invention is collection reaction distribution, the real reading of gas, built-in light source, the experimental provision of system ventilation integral type 200L volume.Internal gas is discharged by the cap-rotating type air-vent on top, right side under dynamic ventilation cleans the dynamic action of part, gas is pressed into by the nitrogen dioxide distribution tank in left side, Hydrocarbon distribution tank and is led in inlet by stainless steel pipe, the on-line monitoring probe field monitoring record that the gas concentration in case is provided with by top.
Specifically, according to above structure, mode of operation of the present invention is:
Main operating part is ventilation cleaning, distribution, regularly readings, record analysis.
1. it is first turned onIn figureDynamic ventilation clean part.Emulation photochemical fog case ventilation fan switch is opened, open the cap-rotating type air-vent 1-2 of casing all directions again, by on-line monitoring 4 monitoring probe 2-1, dynamic ventilation operation is to be charged in casing by experiment outside air, utilizes the extrusion capability of outside air to be discharged outside case by the residual gas in smog box.When the show value of monitoring probe is identical with experiment ambient atmos background value, i.e. reduction background to detector Monitoring lower-cut (0ppb) thinks that gas has rinsed in case.If utilizing air purge speed slow, can on the right side of casing horizontal 187nm fluorescent tube, after energising, in casing, quickly fill with ozone, be then shut off power supply, be passed through air, the ozone in casing is washed together with residual gas.Take a breath when ozone detection probe registration is zero, then fluorescent tube has been removed outside case, tested.
2. after having rinsed, close ventilation fan, close the cap-rotating type air-vent 1-2 of casing all directions, it is ensured that the casing seal of experimentation.Treat that the gas in casing is stable, when i.e. the display of monitoring probe will not change.Opening suspension type built-in light source 5-1, built-in light source is to hang at casing top to fix.According to research contents, one can be selected open, multiple light sources, or do not turn on light carry out dark reaction research reaction mechanism.
The most then, reaction distribution part is started.First, opening stroke valve 3-2 and be pressed into NO2 gas, gas enters box house by aluminum alloy conduit 3-3, meanwhile, opens another one distribution tank 3-1, carries out hybrid reaction with NO2 in VOC gas press-in casing, and operating process is identical with the former.After two kinds of gas ventilation terminate, or can only pour the gas of one pack system when only studying independent gas reaction, flow process is identical with the former.While treating that gas has been pressed into, close stroke valve 3-2, the initial value that record gas monitoring portion is respectively popped one's head in simultaneously in time.
4. it follows that time interval reasonable in design, such as 5min, 10min, the experimental period of this smog box is short, fast to the speed of peaking, so when carrying out reading, it should select smaller time interval, when changing obvious, reading can be carried out at any time.Carry out series of experiments record, the data of record gas monitoring portion detection.
5. last, make curveFigure, analytical data, it was therefore concluded that.The following is the operation result of smog box initial testing, as example.
Test 1 ozone test result
Emulation photochemical fog case ventilation fan switch is opened, then opens the cap-rotating type air-vent of casing all directions, the residual gas in smog box is discharged outside case.When the show value of monitoring probe is identical with experiment ambient atmos background value, closes fan and air-vent, and open Built-in light source, then record the initial value of the gas concentration of each probe.Open the stroke valve of NO2 distribution tank, the NO2 of one stroke of press-in in casing, subsequently, closes stroke valve immediately.The time interval selecting 10min carries out reading, the registration change of record ozone probe, makes curveFigure such as figure 8Shown in.
Test shows, this smog box can draw up ozone in the photodissociation lower mold of NO2, hence it is evident that generates a certain amount of ozone, higher than Experimental Background value.May certify that the ozone main source of photochemical fog is that this is theoretical for the photodissociation of NO2.And the change curve coincidence theory change curve of ozone, the most first raise, after maintaining the regular hour, be slowly lowered to zero.FromIn figureIt can be seen that the reaction time of this smog box is the shortest, will soon reach peak value, about 30min arises that peak value.So time interval it is preferably provided as 5min, 10min, unsuitable excessive.
The effect of test 2VOC
Operating process is identical with test 1, after completing the distribution that ventilation is cleaned with a stroke NO2, opens the stroke valve of VOC distribution tank immediately, is first pressed into the VOC of a stroke, subsequently, closes stroke valve immediately.The registration of ozone and other probes is carried out record.As a comparison, after finishing the experiment of this group, repeat operating procedure last time, after the VOC of one stroke of press-in, close stroke valve immediately.Repeat this VOC distribution step, then be pressed into the VOC of two strokes continuously, carry out record afterwards.Make curveFigure such as figure 9Shown in.
Test result shows
(1) after adding VOC, the change curve of ozone is consistent with test, is all to go out a peak value at about 20-30min, and can maintain a period of time, then slowly declining until being zero, meeting photochemical fog ozone theory change curve.
(2) in the case of pouring VOC gas, ozone changes, show that NO2 is had a certain impact by the addition of VOC to ozone conversion, meet photochemical fog produces this theory relevant with the effect of VOC, when adding a stroke VOC, ozone produces showed increased, and when adding the VOC of three strokes, the generation of ozone also can increase.
Can draw from this twice experiment test, this smog box can make ozone, and may certify that the source of ozone is the photodissociation of NO2, the increase of ozone can be played a role by the effect of VOC, hereafter research direction is the different VOC concrete impact on ozone, such as 5, the impact of 10 stroke VOC.And higher concentration NO can also be studied 2 times, such as 3, under 5 strokes, the different VOC impacts on ozone concentration.
Claims (9)
1. a photochemistry simulation cigarette fog chamber, including smog casing, on the outer wall (1-1) of smog casing
It is provided with some air-vents (1-2), it is characterised in that be provided with on smog casing by some monitoring probes
(2-1) gas monitoring portion formed, is provided with in smog casing and is made up of built-in light source (5-1)
Light source part, smog casing connect have the reaction distribution part for importing gas and in discharging case gas
The dynamic ventilation of body and importing extraneous gas cleans part.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described smog casing
The rigidity cuboid being made up of 6 pieces of PMMA material plates, volume 200L.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described air-vent
(1-2) being respectively provided at the top of outer wall (1-1), front end, two side portions, in case, gas is through air-vent
(1-2) discharge.
Photochemistry simulation cigarette fog chamber the most according to claim 3, it is characterised in that described outer wall (1-1)
Top be provided with the air-vent (1-2) of 5 single files arrangement, be spaced apart 120mm；Each side set
There is the air-vent (1-2) of 5 single-row arrangements, be spaced apart 120mm, and the left and right sides changing with a line
Pore (1-2) is in the same horizontal line；Front end is provided with the air-vent (1-2) of 3 single file arrangements,
It is divided into 200mm.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described monitoring is popped one's head in
(2-1) by including O3、NO2、NO、VOC、CO2, CO, aldehydes monitoring probe is interior multiple
Probe composition, carries out direct-reading record to component gas each in casing, and multiple probes are placed in rigidity smog box
The top of body, registration is both facing to dead ahead.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described reaction distribution
Part includes stroke valve (3-2), stainless steel pipe (3-3), supports seat (3-4) and two distribution tank
(3-1), reacting gas is supplied by distribution tank (3-1), controls gas flow through stroke valve (3-2),
Again by the stainless steel pipe (3-3) being connected from stroke valve (3-2) by the gas of different distribution tank (3-1)
Body imports in smog box body.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described dynamic ventilation
Cleaning part divides and includes supply fan (4-1) and fan (4-2) of giving vent to anger, and the residual gas in casing is by fan of giving vent to anger
(4-2) providing power to discharge from air-vent (1-2), extraneous gas is passed through by supply fan (4-1).
Photochemistry simulation cigarette fog chamber the most according to claim 7, it is characterised in that described supply fan
(4-1) it is arranged in the circular port of a diameter of 100mm with fan (4-2) of giving vent to anger, supply fan (4-1)
Directly over fan (4-2) of giving vent to anger at 180mm.
Photochemistry simulation cigarette fog chamber the most according to claim 1, it is characterised in that described built-in light source
(5-1) be 300～400nm black light lamp, top in smog box body hangs, or by left and right one
Level top air-vent (1-2) in place several implement.
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| CN201610551465.5A CN106000484B (en) | 2016-07-13 | 2016-07-13 | A kind of photochemistry emulation smog box |
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| CN201610551465.5A CN106000484B (en) | 2016-07-13 | 2016-07-13 | A kind of photochemistry emulation smog box |
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| CN106000484B CN106000484B (en) | 2018-10-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084921A (en) * | 2017-04-24 | 2017-08-22 | 北京康威能特环境技术有限公司 | A kind of volume-tunable smog box |
| CN108877370A (en) * | 2018-06-28 | 2018-11-23 | 西安建筑科技大学 | A kind of teaching and experiment method of Atmospheric Photochemical Smog pollution |
| CN110274938A (en) * | 2019-06-26 | 2019-09-24 | 燕山大学 | Photochemical fog experimental provision |
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| CN205833184U (en) * | 2016-07-13 | 2016-12-28 | 西安建筑科技大学 | A kind of photochemistry simulation cigarette fog chamber |
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| JP2003269763A (en) * | 2002-03-12 | 2003-09-25 | Shimazu Rika Kikai Kk | Local exhauster |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084921A (en) * | 2017-04-24 | 2017-08-22 | 北京康威能特环境技术有限公司 | A kind of volume-tunable smog box |
| CN108877370A (en) * | 2018-06-28 | 2018-11-23 | 西安建筑科技大学 | A kind of teaching and experiment method of Atmospheric Photochemical Smog pollution |
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| CN110274938B (en) * | 2019-06-26 | 2020-06-02 | 燕山大学 | Photochemical smog experimental apparatus |
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| CN106000484B (en) | 2018-10-02 |
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