CN101609072B - Volatile organic matter continuous monitor - Google Patents
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Abstract
The invention discloses a volatile organic matter continuous monitor which mainly comprises an absorption and thermal analysis device, a gas chromatography column, an ionizing detector and an electronic six-way valve. The electronic six-way valve is connected with a sampling pipeline, a gas carrier pipeline and a gas calibrating pipeline of a mainframe; the absorption and thermal analysis device is provided with a bracket; an absorption pipe and a condensing pipe are arranged on the bracket; an axial flow fan is arranged at one side of the bracket; the input end of the absorption pipe is connected with a sample gas inlet through the electronic six-way valve; the output end of the absorption pipe is connected with one air pump through the electronic six-way valve; the input end of the condensing pipe is connected with the electronic six-way valve; the absorption pipe is also connected with the air carrier pipeline; the input end of the gas chromatography column is connected with the output end of the condensing pipe; and the input end of the ionizing detector is connected with the output end of the gas chromatography column. The volatile organic matter continuous monitor has the advantages of small size, simple structure, low running and maintaining cost, and strong maneuverability; moreover, the volatile organic matter continuous monitor is suitable for continuously and automatically monitoring the air in urban and pollution source areas.
Description
Technical field
The present invention relates to a kind of environment monitoring equipment, the instrument of volatile organic matter gas concentration in particularly a kind of on-line monitoring surrounding air continuously.
Background technology
VOCs (volatile organic matter) is the crucial pollutant of a class in the atmosphere, is characterized in that concentration is low, active by force, harm is big, and except that methane, the mean volume fraction of all the other VOC in atmosphere is generally all less than 1 * 10
-9, but in the more serious zone of damage ratio, as the big city, the volumetric concentration of some composition may reach 1 * 10
-7Or it is higher.At present, because mankind's activity has changed the mobile equilibrium of Atmospheric Chemistry composition, cause the variation of Atmospheric Chemistry composition, the utilization of continually developing such as resources such as coal, oil and natural gas, make that the VOCs kind is more and more in the atmosphere, atmosphere degraded composition becomes increasingly complex, and is also more and more significant to environment and climatic influences.Especially in urban atmosphere the VOCs wide material sources, various in style, CONCENTRATION DISTRIBUTION scope is wide, the chemical reaction in atmosphere is extremely complicated.Therefore, the VOCs measurement data is its basis to environment and human health influence of research reliably.Because the accurate measuring technique complexity of VOCs, the research of China city VOCs is also very limited at aspects such as target compound quantity, temporal resolution and monitoring periods.In addition, the VOCs atmospheric concentration that monitors is subjected to the influence of factors such as source variation, meteorological condition, chemical reaction process and sampling time, place and duration.So, have only by long-continued monitoring and just can disclose feature and the general trend that the VOCs concentration level changes in the atmosphere, for the environmental quality Control Countermeasure provides scientific basis.
The present most widely used VOCs method of sampling is stainless cylinder of steel sampling, adsorbent sampling, airbag sampling and condensation at low temperature sampling.Methods such as the sample of gathering must pass through that Solid-Phase Extraction, solvent parsing, the pyrolysis of low temperature pre-concentration are analysed are carried out pre-service.Sample analysis mainly relies on methods such as vapor-phase chromatography, high performance liquid chromatography, gas chromatography-mass spectrum, fluorescence spectrophotometry to realize.In the prior art, still there is following problem in the technology that atmosphere VOCs is monitored:
1, sample collecting relies on traditional gas collection method, such as above-mentioned stainless cylinder of steel sampling, adsorbent sampling, airbag sampling and condensation at low temperature sampling etc., these acquisition methods are because the restriction of objective factor, progressively do not satisfy current application demand, had defectives such as adsorption operations complexity, cost height, efficient are low during especially for the VOCs gas of gathering trace in the surrounding air.
2, adopt above-mentioned sample collection method just can be used for analyzing through The pretreatment, owing to can cause artificial pollution to sample unavoidably in pretreated process complexity and the manual intervention when pre-service, the whole process cycle is long, and can bring certain error.
3, complicacy and the concentration level owing to VOCs component in the surrounding air is extremely low, and therefore general mixing ratio realizes that from 10pptv to tens pptv the automatic continuous analysis of VOCs sample is comparatively difficult, and especially the range of linearity to main frame requires broad.Analytical approach commonly used at present is that vapor-phase chromatography and gas chromatography-mass spectrography majority all adopt the off-line analysis technology, and its time resolution is low, and can not reflect the continuous variation of VOCs in the atmosphere.
On-line determination VOC that comes into operation at present and the integrated gas chromatographic technique of OVOC have two classes: a class is the online GC-FID/MS technology of hyperchannel, people such as the breadboard Goldan of US Department of Commerce aeronomy at first are applied to this technology the measurement of OVOCs, and be devoted to improving and optimizating of main frame always and form the complete relatively analytic system (Goldan et al., 2004) of a cover; An other class is GC-RGD (Reduction Gas Detector), and this technology first-selection is adopted (Singh, 1995) by US National Aeronautics and Space Administration.In addition, proton translocation mass spectrum (PTR-MS) is also developed into trace volatile organic matter technology in a kind of effective on-line measurement atmosphere, comprise OVOCs, this technology at first is (the Lindinger that is grown up by the Lindinger of Innsbruck ,Austria university and colleague thereof, et al., 1998).The GC-MS technology is used in volatility, half volatile compound and derivant thereof and has obtained general application, and to on-line measurement and miniaturization development.
China starts late to the research of surrounding air volatile organic matter, the analyser that similar clauseization is not arranged at present as yet, although there is the similar products like blank in domestic scientific research institution, but what it adopted is a kind of barrel tumbler structure, as described in CN1632570A, many sampling adsorption tubes are arranged on the barrel tumbler, by uninterruptedly carrying out that the rotation barrel tumbler is realized sampling and analyze.This method is because complicated in mechanical structure, poor operability, and the loaded down with trivial details and continuous working of implementation procedure is prone to gas leak phenomenon.Therefore China to the surrounding air volatile organic matter gather automatically continuously and analytical instrument mainly relies on import equipment, but its cost an arm and a leg, the analytic process complexity, the temporal resolution of sampling and analysis is lower, and the continuous monitoring analysis of still being unrealized.
So, study the method for sampling and the analytical technology of VOCs of new generation, development high sensitivity, easy and simple to handle, the economic and practical and VOCs analyser that is easy to safeguard, development VOCs on-line continuous Automatic Measurement Technique, significant in the ambient air monitoring research field.
Summary of the invention
Technical matters to be solved by this invention is the problem that existing volatile organic matter monitoring equipment analytic process complexity, temporal resolution are low, can't realize the continuous on-line analysis, monitor of the present invention can be to realizing two-stage absorption by the sample gas of adsorption tube and concentration tube, concentrate and can Fast Heating resolving, send into gas chromatographic column and ionization detector quantitative test then, realized under normal temperature condition surrounding air in volatile organic matter fast, efficiently, automatic monitor for continuously accurately.
For solving the problems of the technologies described above, the technical solution used in the present invention is, a kind of volatile organic matter continuous monitor, it has main frame, described main frame comprises absorption and thermal analysis apparatus, gas chromatographic column and ionization detector, and described main frame is provided with the import of sample gas, the outlet of sample gas, carrier gas inlet, air in, it is characterized in that, described main frame also comprises an electronic six-way valve, and described electronic six-way valve connects sample lines, gas-carrier pipeline and the gas pipeline of main frame; Described absorption and thermal analysis apparatus have a support, support is provided with an adsorption tube and a concentration tube, one axial flow blower is arranged on support one side, the input end of described adsorption tube links to each other with the import of sample gas through described electronic six-way valve, described adsorption tube output terminal connects an air pump through electronic six-way valve, described concentration tube input end is connected with described electronic six-way valve, described adsorption tube also is connected with gas-carrier pipeline, be arranged with electrical heating wire on adsorption tube and the concentration tube respectively, described electrical heating wire is connected with high temperature connection terminal on being arranged on support; The input end of described gas chromatographic column links to each other with the output terminal of described concentration tube; The input end of described ionization detector connects the output terminal of described gas chromatographic column.
Wherein, described volatile organic matter continuous monitor also comprises the empty all-in-one of refrigeration unit, flow detection control module, power supply unit and embedded computer control and treatment display unit, vaporizer and hydrogen, the vaporizer input end connects the sample gas import of described main frame, the hydrogen outlet of the empty all-in-one of hydrogen connects adsorption tube by carrier gas inlet, and the air out of the empty all-in-one of hydrogen connects the air in of main frame.The support of described absorption and thermal analysis apparatus is upper and lower double-decker, and adsorption tube is positioned at lower floor, concentration tube is positioned at the upper strata, and the support levels is set to staggered floor construction, and the axial flow blower wind direction of support is towards described carriage center.Described electrical heating wire surface also is provided with temperature sensor; The input end and the output terminal of described adsorption tube and concentration tube are equipped with valve, are with the taper cutting ferrule in the described valve, and described taper cutting ferrule is the teflon material.Described adsorption tube and concentration tube material are quartz glass, and described adsorption tube length is 80mm-100mm, and internal diameter is 3-3.5mm, and external diameter is 4.5-5.5mm, and described concentration tube length is 80mm-100mm, and internal diameter is 0.2-0.4mm, and external diameter is 0.4-0.6mm.Described adsorption tube and concentration tube material are stainless steel, described adsorption tube and concentration tube length are 20mm-60mm, and external diameter is 1.5-3mm, and internal diameter is 1-2mm, described adsorption tube and concentration tube are handled through silanization, and described stainless-steel tube turns to spiral fashion and is fixed on the support.Be filled with adsorbent in described adsorption tube and the concentration tube, the adsorbent two ends are respectively equipped with quartz glass wool or the stainless (steel) wire after silanization is handled; Be filled with two sections adsorbents in the described adsorption tube, be respectively 20-40 purpose Carbotrap ketjenblack EC and 60-80 purpose Carbosieve SIII carbonaceous molecular sieve; Be filled with one section adsorbent in the described concentration tube, be 60-80 purpose Carbopack B ketjenblack EC.Described gas chromatographic column is arranged in the temperature programmed control post case, be provided with a copper coin in the described temperature programmed control post case, described gas chromatographic column coiling is fixed on described copper coin upper surface, be provided with heating plate below the described copper coin, described heating plate below is provided with thermal insulation board, described thermal insulation board below is provided with axial flow blower, and the material of described gas chromatographic column is a quartz glass, and the gas chromatography column length is 5 meters of 20-3.Described temperature programmed control post case one side offers two sulculuses, and the input end of gas chromatographic column and output terminal pass described two sulculuses respectively; Described temperature programmed control post case is provided with the post case lid, described post case lid is provided with synchronous motor, described post case lid is a double-decker, and 4 petal type perforates are arranged on the post case lid, described post case lid is nested with another petal fan door with spline structure, described synchronous motor is fixed on the post case lid, described synchronous motor shaft passes the center pit of post case lid and described case lid and is nested with a petal fan door center and is fixedly connected, be provided with above the described post case lid and on the synchronous motor shaft between the motor cabinet and be fixed with a light control plate, described light-operated edges of boards are provided with optoelectronic switch and are fixed in above the described post case lid.Described ionization detector is photoionization detector or flame ionization detector.
The beneficial effect that the present invention can reach is:
1, the present invention carries out on-line adsorption by adsorption tube to volatile organic matter in the surrounding air, after Rapid Thermal by one-level is resolved the sample pneumatic transmission gone into that concentration tube carries out secondary concentration and pyrolysis is analysed, volatile organic matter in having realized under normal temperature condition surrounding air is particularly to the sampling of C4-C12 trace organic substance with concentrate;
2, the present invention resolves by the organism Fast Heating that will concentrate in the concentration tube, send in the gas chromatographic column then, separate by the stationary phase in the chromatographic column, sample after the separation enters into ionization detector, can realize the continuous automatic inspection to organism C4-C12 non-methane hydro carbons in the surrounding air;
3, volume of the present invention is little, simple in structure, can realize the longest temporal resolution that obtained one group of sampled result in 30 minutes by single adsorption tube, and sensitivity can reach 0.01ppbv, its operation and maintenance cost are low, workable, be particularly suitable for city and the automatic monitor for continuously that pollutes the source region surrounding air.
Description of drawings
Fig. 1 is an embodiment of the invention volatile organic matter continuous monitor one-piece construction synoptic diagram;
Fig. 2 is that sample absorption among Fig. 1 and thermal analysis apparatus A-A are to synoptic diagram;
Fig. 3 is that temperature programmed control chromatograph box B-B among Fig. 1 is to cut-open view.
The number in the figure explanation:
Absorption of 1-sample and thermal analysis apparatus
101-input valve 101 '-output valve 102-imports valve 102 '-output valve
103-support 104-thermal insulation board 105-axial flow blower 106-base plate
107-concentration tube 108,108 '-electrical heating wire 109-adsorption tube 110-high temperature connection terminal
111,111 '-temperature sensor 112-high temperature connection terminal
2-temperature programmed control chromatograph box
201-synchronous motor 202-electric machine support 203-card slot type optoelectronic switch 204-light control plate
205-post case lid 206-petal type fan door 207-copper coin 208-thermal insulation board
209-post casing 210-gas chromatographic column 211-heating plate 212-axial flow blower
The 3-flame ionization ditector
The electronic six-way valve of 4-vaporizer 5-
6-sample refrigeration unit 7-flow detection control module 8-power supply unit
9-embedded computer control and treatment display unit
Embodiment
Consult Fig. 1, one-piece construction figure for embodiment of the invention volatile organic matter continuous monitor, it has main frame, main frame comprises absorption and thermal analysis apparatus 1, temperature programmed control chromatograph box 2, ionization detector 3, electronic six-way valve 5, and this monitor also further comprises vaporizer 4, sample refrigeration unit 6, flow detection control module 7, power supply unit 8, embedded computer control and treatment display unit 9 and hydrogen sky all-in-one (not shown).Described main frame is provided with the import of sample gas, the outlet of sample gas, carrier gas inlet, air in.
Vaporizer 4 input ends connect the sample gas import of described main frame, and the hydrogen outlet of the empty all-in-one of hydrogen connects the carrier gas inlet of described main frame, and the air out of the empty all-in-one of hydrogen connects the air in of main frame.
Sample adsorbs and the thermal analysis apparatus structural representation as shown in Figure 2, and it has, and a support 103, one thermal insulation boards 104 are divided into enriched layer with support 103 and adsorbed layer is two-layer up and down, and the support levels is the staggered floor setting.Lower floor's adsorbed layer is provided with input valve 101 and output valve 101 ', and high temperature connection terminal 112 is installed on the base plate 106 of support 103, and adsorption tube 109 wears by valve 101 and valve 101 ' and is fixed between two end supports; On adsorption tube 109, be wound with electrical heating wire 108, its two ends are connected to respectively on the binding post of high temperature connection terminal 112, one temperature sensor 111 is fixed on the centre of high temperature binding post 112, and the temperature sense face of described temperature sensor 111 is close to the electrical heating wire surface on the adsorption tube 109; One axial flow blower 105 is installed on the support base plate 106, and adsorption tube 109 is aimed in its wind direction outlet; Input valve 101 is connected to the import of sample gas through electronic six-way valve, and output valve 101 ' is connected to aspiration pump inlet through pipelines such as electronic six-way valves.The upper strata enriched layer has and the similar structure of adsorbed layer, and high temperature connection terminal 110 is installed on thermal insulation board 104, and the two ends of support are provided with input valve 102 and output valve 102 ' are installed; One concentration tube 107 wears by two valves and is fixed on 103 on support; Be wound with electrical heating wire 108 ' on concentration tube 107, the two ends of electrical heating wire 108 ' are connected to respectively on the binding post of high temperature connection terminal 110; One temperature sensor 111 ' is fixed on the centre of high temperature binding post 110, and the temperature sense face of described temperature sensor 111 ' is close to the surface of the electrical heating wire 108 of coiling on the concentration tube 107; Input valve 102 is connected on the wherein output port of electronic six-way valve, and output valve 102 ' is connected to the input end of gas chromatographic column.All be with the taper cutting ferrule of making by the teflon material in the input and output valve of above-mentioned adsorption tube and concentration tube.
Among the present invention, for adsorption tube and concentration tube following special design is arranged, adsorption tube and concentration tube material are quartz glass, adsorption tube length is 80mm-100mm, internal diameter is 3-3.5mm, and external diameter is 4.5-5.5mm, and described concentration tube length is 80mm-100mm, internal diameter is 0.2-0.4mm, and external diameter is 0.4-0.6mm.Perhaps described adsorption tube and concentration tube material are stainless steel, and described adsorption tube and concentration tube length are 20mm-60mm, and external diameter is 1.5-3mm, and internal diameter is 1-2mm.Described adsorption tube and concentration tube are handled through silanization, and described stainless-steel tube turns to spiral fashion and is fixed on the support.Be filled with adsorbent in adsorption tube and the concentration tube, the adsorbent two ends are respectively equipped with quartz glass wool or the stainless (steel) wire after silanization is handled.Wherein, be filled with two sections adsorbents in the described adsorption tube, described adsorbent is respectively Carbotrap (20-40 order) ketjenblack EC and Carbosieve SIII (60-80 order) carbonaceous molecular sieve.Be filled with one section adsorbent in the concentration tube, described adsorbent is Carbopack B (60-80 order) ketjenblack EC.
Further consult Fig. 3, for the B-B of temperature programmed control chromatograph box parts 2 among Fig. 1 to cut-open view, it is a cylindrical box structure, comprise a post casing 209, one axial flow blower 212 is provided with and is installed in post case bottom, wind direction during 212 work of this axial flow blower along the air channel at post case center to up-draught, thermal insulation board 208 is installed in the post case, one heating plate 211 is set above the thermal insulation board 208, on heating plate, install and fix a copper coin 207, gas chromatographic column 210 is coiled in the surface of copper coin 207, and the input end of gas chromatographic column 210 and output terminal pass two sulculuses that temperature programmed control post case one side is offered respectively.One post case lid 205 is set above the post case, described post case lid 205 is a double-decker, and 4 petal type perforates are arranged on the post case lid, described post case lid is nested with another petal fan door with spline structure and constitutes petal type fan door 206, one electric machine support 202 is installed on the post case lid, synchronous motor 201 is fixed on the electric machine support 202, and the center of the center pit of this synchronous motor beam warp post case lid 205 and embedded petal type fan door 206 is fixedly connected.On the motor shaft between motor and the post case lid, be equiped with a light control plate 204, and one card slot type optoelectronic switch 203 be installed at light control plate 204 edges.Wherein, the material of gas chromatographic column 210 is a quartz glass, and described gas chromatography column length can be 20-35 rice.
Ionization detector in the present embodiment adopts flame ionization ditector, also can adopt photoionization detector.
According to said structure, the course of work of embodiment of the invention volatile organic matter continuous monitor mainly comprises following several big step:
The output valve 101 ' of A, adsorption tube is under the power of bleeding of aspiration pump, and sample gas (gas to be measured) is by pipelines such as the injection port of main frame and filtrators, through electronic six-way valve by Fig. 2 in input valve 101 ends enter adsorption tube 109.Start the sample refrigeration unit 6 of one-level absorption, volatile organic matter in the sample gas is adsorbed onto efficiently in the adsorbent of adsorption tube 109 and is sampled, after sampling finishes, sample refrigeration unit 6 out of service, the electronic six-way valves 5 of switching of one-level absorption, aspiration pump continues to bleed and makes sample lines be in continuous emptying state.The hydrogen carrier gas that produces in the empty all-in-one of hydrogen blows to input valve 101 ends by output valve 101 ' end, and discharges through electronic six-way valve, finishes the purge to collected specimens in the adsorption tube 109.After finishing, purge input valve 101 ends of adsorption tube 109 are communicated with the gas circuit of concentration tube 107 ends by switching electronic six-way valve, and the electrical heating wire that will be wound on the adsorption tube 109 is rapidly heated to 300 degree, under the promotion of carrier gas, the sample gas in the adsorption tube 109 resolved and enter in the concentration tube 107 and concentrate, start the refrigeration unit of concentration tube part simultaneously by input valve 102 ends.After this resolving finishes, start 109 heat radiations of 105 pairs of adsorption tubes of axial flow blower and the adsorption tube temperature is reduced to environment temperature.Restart aspiration pump, carry out next sample states.
B, when adsorption tube carries out next one sampling, the refrigeration unit of concentration tube part is out of service, the electrical heating wire 108 of concentration tube is rapidly heated to 250 degree, makes gaseous sample in the concentration tube 107 under the promotion of carrier gas, enter gas chromatographic column through 102 ' end moment.
C, analyse when entering chromatographic column 210 by the concentration tube pyrolysis, heat up by certain temperature and heating rate, in chromatographic column, more effectively separate with the compound that is fit to different boiling by 207 pairs of chromatographic columns 210 of programmed control copper coin when sample.Because fixed phase stuffing makes each compound arrive the sequencing difference of ionization detector through chromatographic column to the amount of force difference of each compound composition in the sample in the capillary gas chromatographic column, thereby has realized effective separation of material.After sample analysis is finished, the petal type fan door 206 of opening synchronous motor 201 drive post case lids 205 rotates, its turned position is determined just to open till the fan door by light control plate 204 and optoelectronic switch 203, open 212 pairs of chromatographic column blowings of axial flow blower simultaneously, make it to reduce to till the environment temperature, when temperature arrives the set-point, close fan door 206 again, closing axle flow fan 212 enters next analytic process.
D. flame ionization ditector carries out the qualitative, quantitative measurement to different volatile organic matters.
E. when carrying out timing signal, standard model is injected sample vaporization chamber, repeat above A, B, C again, the D plurality of processes gets final product with main frame.
This course of work has realized adopting single adsorption tube with single concentration tube sample collecting to be occurred in the same time period with separating, and has shortened the work period effectively, has improved the work efficiency of main frame, can finish one group of sample collecting and analysis in 30 minutes.
Adsorption tube of the present invention plays the efficient suction-operated of the rapid acquiring of surrounding air sample, and concentration tube plays the concentrated optimization of sample gas and improves the effect of chromatographic resolution effect.Adopt surrounding air volatile organic matter in-line analyzer of the present invention under the outdoor environment of inner city, to gather atmospheric sample and carry out online actual monitoring, in 30 minutes, promptly obtain a group analysis result, and can tell different volatile organic matters more than 30 kinds from the spectrogram at least, can determine the kind of volatile organic matter and the concentration in surrounding air by standard specimen.Adopt surrounding air volatile organic matter in-line analyzer of the present invention, can realize that compound carries out automatic on-line or motor-driven monitoring to the non-methane of C4-C12 in atmosphere and the pollution source environment volatile organic matter is hydrocarbon etc., its volume is little, simple in structure, only adopt two single tubes can realize continuous sample collecting and analysis, operation and maintenance cost are low, workable, are particularly suitable for the automatic monitor for continuously of city and pollution source region surrounding air.
To sum up institute is old, for one of the present invention preferred embodiment, is not the scope that is used for limiting the invention process only.Be that all equalizations of being done according to the present patent application claim change and modification, be all claim of the present invention and contain.
Claims (10)
1. volatile organic matter continuous monitor, it has main frame, and described main frame comprises absorption and thermal analysis apparatus, gas chromatographic column and ionization detector, and described main frame is provided with the import of sample gas, the outlet of sample gas, carrier gas inlet, air in, it is characterized in that
Described main frame also comprises an electronic six-way valve, and described electronic six-way valve connects sample lines, gas-carrier pipeline and the gas pipeline of main frame;
Described absorption and thermal analysis apparatus have a support, support is provided with an adsorption tube and a concentration tube, one axial flow blower is arranged on support one side, the input end of described adsorption tube links to each other with the import of sample gas through described electronic six-way valve, described adsorption tube output terminal connects an air pump through electronic six-way valve, described concentration tube input end is connected with described electronic six-way valve, described adsorption tube also is connected with gas-carrier pipeline, be arranged with electrical heating wire on adsorption tube and the concentration tube respectively, described electrical heating wire is connected with high temperature connection terminal on being arranged on support;
The input end of described gas chromatographic column links to each other with the output terminal of described concentration tube;
The input end of described ionization detector connects the output terminal of described gas chromatographic column.
2. volatile organic matter continuous monitor according to claim 1, it is characterized in that, described volatile organic matter continuous monitor also comprises the empty all-in-one of refrigeration unit, flow detection control module, power supply unit and embedded computer control and treatment display unit, vaporizer and hydrogen, the vaporizer input end connects the sample gas import of described main frame, the hydrogen outlet of the empty all-in-one of hydrogen connects adsorption tube by carrier gas inlet, and the air out of the empty all-in-one of hydrogen connects the air in of main frame.
3. volatile organic matter continuous monitor according to claim 1 and 2, it is characterized in that, the support of described absorption and thermal analysis apparatus is upper and lower double-decker, adsorption tube is positioned at lower floor, concentration tube is positioned at the upper strata, the support levels is set to staggered floor construction, and the axial flow blower wind direction of support is towards described carriage center.
4. volatile organic matter continuous monitor according to claim 3 is characterized in that, described electrical heating wire surface also is provided with temperature sensor; The input end and the output terminal of described adsorption tube and concentration tube are equipped with valve, are with the taper cutting ferrule in the described valve, and described taper cutting ferrule is the teflon material.
5. volatile organic matter continuous monitor according to claim 1 is characterized in that, described adsorption tube and concentration tube are the quartz glass material; Described adsorption tube length is 80mm-100mm, and internal diameter is 3-3.5mm, and external diameter is 4.5-5.5mm; Described concentration tube length is 80mm-100mm, and internal diameter is 0.2-0.4mm, and external diameter is 0.4-0.6mm.
6. volatile organic matter continuous monitor according to claim 1, it is characterized in that, described adsorption tube and concentration tube are stainless steel, described adsorption tube and concentration tube length are 20mm-60mm, external diameter is 1.5-3mm, internal diameter is 1-2mm, and described adsorption tube and concentration tube are handled through silanization, and described adsorption tube and concentration tube turn to spiral fashion and be fixed on the support.
7. according to claim 5 or 6 described volatile organic matter continuous monitors, it is characterized in that, be filled with adsorbent in described adsorption tube and the concentration tube, the adsorbent two ends are respectively equipped with quartz glass wool or the stainless (steel) wire after silanization is handled; Be filled with two sections adsorbents in the described adsorption tube, be respectively 20-40 purpose Carbotrap ketjenblack EC and 60-80 purpose Carbosieve SIII carbonaceous molecular sieve; Be filled with one section adsorbent in the described concentration tube, be 60-80 purpose Carbopack B ketjenblack EC.
8. volatile organic matter continuous monitor according to claim 1 and 2, it is characterized in that, described gas chromatographic column is arranged in the temperature programmed control post case, be provided with a copper coin in the described temperature programmed control post case, described gas chromatographic column coiling is fixed on described copper coin upper surface, be provided with heating plate below the described copper coin, described heating plate below is provided with thermal insulation board, described thermal insulation board below is provided with axial flow blower, the material of described gas chromatographic column is a quartz glass, and the gas chromatography column length is a 20-35 rice.
9. volatile organic matter continuous monitor according to claim 8 is characterized in that, described temperature programmed control post case one side offers two sulculuses, and the input end of gas chromatographic column and output terminal pass described two sulculuses respectively; Described temperature programmed control post case is provided with the post case lid, described post case lid is provided with synchronous motor, described post case lid is a double-decker, and 4 petal type perforates are arranged on the post case lid, described post case lid is nested with another petal fan door, described synchronous motor is fixed on the post case lid, described synchronous motor shaft passes the center pit of post case lid and described case lid and is nested with a petal fan door center and is fixedly connected, be provided with above the described post case lid and on the synchronous motor shaft between the motor cabinet and be fixed with a light control plate, described light control plate is provided with optoelectronic switch, and described optoelectronic switch is fixed in above the described post case lid.
10. volatile organic matter continuous monitor according to claim 1 and 2 is characterized in that, described ionization detector is photoionization detector or flame ionization detector.
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