CN2769886Y - Atmospheric volatile organic substance on-line analysis instrument - Google Patents
Atmospheric volatile organic substance on-line analysis instrument Download PDFInfo
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- CN2769886Y CN2769886Y CN 200520001906 CN200520001906U CN2769886Y CN 2769886 Y CN2769886 Y CN 2769886Y CN 200520001906 CN200520001906 CN 200520001906 CN 200520001906 U CN200520001906 U CN 200520001906U CN 2769886 Y CN2769886 Y CN 2769886Y
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Abstract
The utility model relates to an atmospheric volatile organic substance on-line analyzing instrument, which is characterized in that the utility model comprises an operation desk, a supporting seat, an electric heater, a sampling pump, a high purity hydrogen generator, an electric motor, a support, an enriching pipe, a gas phase chromatographic column and an FID detector, wherein the supporting seat is provided with two side walls and a turnover cap, and the two side walls are provided with a sampling inlet, a sampling outlet, a carrier gas inlet and a carrier gas outlet; the electric heater is arranged on the turnover cap; the sampling pump is connected with a sampling outlet, and the sampling outlet is connected with an air inlet pipe; the high purity hydrogen generator is connected with two carrier gas inlets through a reversing valve; the electric motor drives a rotating hub through a transmission device, and at least two adsorption pipes are respectively connected with a fixed seat which is arranged on the rotating hub; a heater is arranged on the support; the enriching pipe penetrates into the heater; one end of the gas phase chromatographic column is connected with the enriching pipe, and the other end is wound and fixed in a heat preserving column box; the input end of the FID detector is connected with the gas phase chromatographic column, and is arranged on the operation desk. The utility model can carry out on-line automatic continuous monitoring on C< 4 >-C< 12 > non-methane, hydrocarbons, etc. of the volatile organic substances of the atmosphere, and is suitable for the urban and suburban atmospheric monitoring which needs a large amount of field sampling.
Description
Technical field
The utility model relates to a kind of environment protection and monitoring instrument, particularly about a kind of on-line analyzer for atmospheric volatile organic compounds.
Background technology
Volatile organic compounds (Volatile Organic Compounds, be called for short VOCs) is meant that boiling spread saturated vapor pressure under 50～260 ℃, room temperature surpasses the compound of 133.322Pa.This compounds is prevalent in the indoor-outdoor air, is playing the part of important role in the generation of Tropospheric ozone increase and other oxygenants, and it can also directly produce secondary pollutions such as organic gasoloid.The more important thing is some compounds such as benzene, 1 in the VOCs composition, the 3-butadiene has potential carcinogenesis, therefore the existence of VOCs, source, the regularity of distribution, migration transform and health effects are subject to people's attention always in the research environment, and become the emphasis of domestic and international research.The VOCs complicated component, content is atomic, and setting up simple and reliable VOCs sampling and assay method is the necessary means that realizes this research.
The most widely used VOCs method of sampling is airbag sampling, the sampling of stainless cylinder of steel, adsorbent sampling and low temperature sampling at present.Sample pretreating method has solvent analytical method, solid-phase microextraction method, low temperature pre-concentration-Re analytical method etc.Sample analysis method has: vapor-phase chromatography, high performance liquid chromatography, gas chromatography-mass spectrography, fluorescence spectrophotometry, film import mass spectroscopy etc.In the prior art, there is following problem in the technology to atmosphere VOCs monitoring:
1, sample collecting: all there is certain defective in the present various method of samplings in the process of sampling, and for example: the airbag sampling is seldom used now because inwall exists absorption and desorb effect; The sampling of stainless cylinder of steel need be sent back to and be carried out that adsorbent concentrates or the low temperature pre-concentration is handled behind the laboratory, though penetrating and artificial pollution can avoid the adsorbent sampling time repeatedly analyzed, the expense height needs complicated cleaning equipment.Though adsorbent sampling and low temperature sampling can be finished the pre-concentration to sample in sampling, need the low temperature transportation, deposit, this higher logistics demand but is difficult to accomplish in the automatic monitor for continuously in outfield.
2, sample pretreatment: for the absorption-desorption method, no matter be that solvent is resolved or pyrolysis is analysed, be still problem demanding prompt solution for the volatilization of VOCs in the analyzing efficiency that how to improve sample and the recovery, the minimizing resolving; Though the low temperature sampling can prevent the artificial pollution that adsorbent brings, the error that compound and ozone reaction bring in the time of can't avoiding sampling also can produce problems such as moisture content interference, complicated operation simultaneously.
3, the automatic continuous analysis of sample analysis: VOCs is a technology that relatively is difficult to carry out, this be because: VOCs is the component complexity in atmospheric environment, hundreds of substance classes wherein, its mixing ratio from less than 10pptv to tens ppbv, therefore realize sample separation and distinguish that required analysis time is long, require the range of linearity of instrument wide.The most frequently used analytical approach is vapor-phase chromatography and gas chromatography-mass spectrography at present, but adopt the off-line analysis technology mostly, temporal resolution is low, can't reflect the concentration meticulous variation in time of various material compositions among the VOCs, and the process of sampling analysis simultaneously is higher to operating personnel's technical requirement.
In context of detection, gas chromatography system can combine with flame ionization detector (fid detector), electron capture detector (ECD detecting device), photoionization detector non-extraordinary detecting devices such as (PID detecting devices), also can combine with the mass detector (MSD detecting device) of special type, realization is qualitative and quantitative to VOCs's.
In China, research to the ambient atmosphere volatile organic matter is started late, collection analysis to atmospheric volatile organic compounds mainly is to rely on external large-scale analytical equipment and instrument, not only cost an arm and a leg, and analytic process is numerous and diverse, sampling and the temporal resolution of analyzing are very poor, the real-time analysis of still being unrealized, and the actual needs of studying with atmospheric pollution still has bigger gap.Therefore, the method of sampling and the analytical technology of VOCs upgraded in research, the VOCs analytical instrument of development high sensitivity, easy and simple to handle, economical and practical and easy care, development VOCs on-line continuous automatic monitoring technical has great importance in the atmosphere environment supervision research field.
Summary of the invention
At the problems referred to above, the purpose of this utility model provides a kind of highly sensitive, and is easy to operate, economical and practical, and can carry out the on-line analyzer for atmospheric volatile organic compounds of automatic continuous monitoring.
For achieving the above object, the utility model is taked following technical scheme: a kind of on-line analyzer for atmospheric volatile organic compounds is characterized in that it comprises: an operator's console; One has the supporting seat that renovate two side and, and it is arranged on the described operator's console, is provided with sampling import and export and carrier gas import and export on the described two side at least; One electric heater, it is arranged on described renovating; One sampling pump, it connects described sampling outlet by pipeline, and described sampling import connects a draft tube; One high-purity hydrogen generator, it connects two described carrier gas inlet respectively by a reversal valve; The gearing of one driven by motor, it is arranged on an end of described supporting seat; One rotates hub, and it is connected with the output terminal of described gearing, is arranged on rotationally between the described two side; At least two adsorption tubes, it is connected on the holder that is provided with on the described rotation hub, is provided with two sections adsorbents in the described adsorption tube; One support, its with described driven by motor to pass to device relative, be arranged on the described operator's console of described supporting seat one end; One well heater, it is arranged on the described support; One enrichment pipe, it exports connection with being connected described carrier gas, and is located in the described well heater, is provided with adsorbent in the described enrichment pipe; One gas chromatographic column, the one end is connected with described enrichment pipe, and other end coiling is fixed in the insulation post case; One fid detector, its input end connect described gas chromatographic column and are arranged on the described operator's console.
In the close described carrier gas inlet of described enrichment pipe one side, be provided with a straight-through described commutation plug, described straight-through commutation plug axially is provided with a center pit that connects, and one screw axially is set at described commutation plug one end, in described screw, connect an outlet, described enrichment pipe is plugged in the described outlet, the middle part of described commutation plug is provided with the radial hole of the described center pit of a connection, and the both sides of described radial hole axially are respectively arranged with an O-ring seal.
Except that the close described carrier gas inlet of described enrichment pipe one side, being arranged on commutation plug in each import and export on the described supporting seat is an end and is semiclosed shape, the other end is provided with a center pit, be provided with the radial hole of the described center pit end of a connection at the middle part of described commutation plug, the both sides of described radial hole axially are respectively arranged with an O-ring seal.
The output shaft outer end of the gearing on described supporting seat connects a printing opacity positioning disk, the corresponding photoelectrical coupler that also is provided with on described supporting seat with it.
Be provided with a dish line plate in the described insulation post case, described gas chromatographic column dish is established and is fixed on the described dish line plate, is provided with a radiator fan below the described dish line plate.
Described enrichment pipe is the capillary quartz ampoule.
25～35 meters of described chromatogram column lengths.
The utility model is owing to take above technical scheme, it has the following advantages: 1, the utility model adsorbs atmospheric volatile organic compounds is online by being arranged on the adsorption tube that rotates on the hub, again by after the thermal desorption, it is sent into carry out second adsorption and thermal desorption in the enrichment pipe, and then realized under normal temperature condition to atmospheric volatile organic compounds, particularly to C in the atmosphere
4-C
12The organic sampling of trace and concentrated.2, the utility model, is sent in the gas chromatographic column about 30 meters in the transient heating desorb by the organism that will be in the enrichment pipe concentrates, separates by the stationary phase in the chromatographic column, and can realize C in the atmospheric volatile organic compounds by fid detector
4-C
12The automatic monitor for continuously of non-methane hydro carbons.3, the utility model volume is small and exquisite, gases used kind is few, do not need cryogenic conditions such as liquid nitrogen, has higher temporal resolution, sensitivity can reach 0.01ppbC, and the logistics demand is low, and operating cost is low, easy to operate, needing to be well suited for the city and the suburb atmospheric surveillance of a large amount of outer quarry samplings.
Description of drawings
Fig. 1 is the utility model structural representation
Fig. 2 is the schematic top plan view of Fig. 1
Fig. 3 is the utility model push rod positioning disk structural representation
Fig. 4 is that the utility model rotates the hub structure synoptic diagram
Fig. 5 is the sectional side view of Fig. 4
Fig. 6 is the utility model adsorption tube structural representation
The schematic side view of Fig. 6 of Fig. 7
Fig. 8 is the utility model clamping support synoptic diagram
Fig. 9 is the schematic side view of Fig. 8
Figure 10 is the utility model commutation plug structural representation
Figure 11 is the another kind of commutation of a utility model plug structural representation
Embodiment
As Fig. 1, shown in Figure 2, the utility model comprises an operator's console 1, one supporting seat 2 is set on operator's console 1, supporting seat 2 comprises that two side 3 and renovates 4, an electric heater 5 is set renovating on 4, an end of 3 is provided with a worm gearing 7 by motor 6 drives in the two side, output shaft 8 one ends at gearing 7 connect a rotation hub 9, the other end connects a printing opacity positioning disk 10 (as shown in Figure 3), printing opacity positioning disk 10 is provided with light tank 48, corresponding with printing opacity positioning disk 10, supporting seat 2 is provided with a photoelectrical coupler (not shown), rotates the rotational angle of hub 9 with accurate location.
As Fig. 4, shown in Figure 5, rotate hub 9 and form by a cylinder 11 and the disk 12 that is arranged on cylinder 11 two ends, cylinder 11 is fixed on the output shaft 8 of gearing 7.Correspondence is provided with a plurality of adsorption tube holders 13 on two disks 12, plugs an adsorption tube 14 (as Fig. 6, shown in Figure 7) on the holder 13 of per two correspondences, is provided with the carbonaceous molecular sieve of two sections absorption different-grain diameter materials as adsorbent in the every adsorption tube 14.Axially being provided with of adsorption tube 14 into and out of pore 15, corresponding with it, the holder 13 of two disks 12 also axially be provided with penetrating into and out of pore 16.Rotate holder 13 quantity that are provided with on the hub 9 and can be arranged to two, three, four or six as required, and then form two or three working positions, half in four or six is the candidate working position.
As Fig. 8, shown in Figure 9, be respectively arranged with sampling import 17 and sampling outlet 18 on the two side 3 of supporting seat 2, the opening form of sampling import and export 17,18 is that correspondence is opened an axial hole on two side 3, again 3 the radial hole of radially opening a connection axial hole in the two side.One commutation plug 19 (as shown in figure 10) is set respectively in the axial hole of two side 3, the one end sealing other end of commutation plug 19 is provided with a center pit 20, the radial hole 21 of one connection center pit, 20 ends is set at the middle part of commutation plug 19, step axle 22 places in radial hole 21 both sides are provided with a rubber seal 23 respectively, have at commutation plug 19 to be provided with wear-resisting in the end of center pit 20 and the poly-PTFE 24 of rubber-like.During installation, the blind end of commutation plug 19 is outside, 3 axial hole inserts from the two side, and head into by screw 25 (as shown in Figure 1) plug 19 that will commutate, commutation plug 19 has an end of poly-PTFE 24 and is advisable to be close to rotate hub 9 but do not influence its rotation, to cooperate printing opacity positioning disk 10 simultaneously, make that to rotate hub 9 revolutions moving once, the center pit 21 on the commutation plug 19 can both aim at rotate on the hub 9 into and out of the hole 16.Connect a draft tube 27 in sampling import 17, connect an aspiration pump 26 in sampling outlet 18.
As shown in Figure 8, also be provided with two carrier gas inlet 28,29 on the two side 3 of supporting seat 2, the opening form of two carrier gas inlet 28,29 is identical with the opening form of sampling import and export 17,18, and in carrier gas inlet 28, also be provided with a commutation plug, different is that what to be provided with in carrier gas inlet 29 is a straight-through commutation plug 30 (as shown in figure 11).The center pit 31 of commutation plug 30 is through holes, and the setting of radial hole 32 and two rubber seal 33 is identical with semi-enclosed commutation plug 19.Commutation plug 30 in the carrier gas inlet 29 is radially with near an end air inlet of rotating hub 9, and forms carrier gas outlet 34 away from an end that rotates hub 9.End in carrier gas outlet 34 also is provided with a screw, screws in an outlet 35 in screw, inserts the enrichment pipe 36 that the capillary quartz ampoule is made in outlet 35.As Fig. 8, shown in Figure 9, on two carrier gas inlet 28,29, connect a high-purity hydrogen generator 38 by a reversal valve 37, feed hydrogen in two carrier gas inlet 28,29, to select a ground.On supporting seat 2 other working position can also be set, purge import and export 39 (as shown in Figure 9) such as being provided with, and connect pressure-air, the adsorption tube 14 that desorb is finished purges cleaning.
As shown in Figure 1 and Figure 2, export 34 1 sides near carrier gas and be provided with a support 40 on operator's console 1, a well heater 41 is set on support 40, well heater 41 can be an inductive coil that is connected with transformer, also can be other heating arrangement.Enrichment pipe 36 passes in the middle of well heater 41, and be provided with ketjenblack EC etc. in the enrichment pipe in well heater 41 36 as adsorbent, in case the transformer as well heater 41 starts, inductive coil meeting transient heating to required high temperature makes the rapid desorb of material in the enrichment pipe 36.The other end of enrichment pipe 36 connects a capillary gas chromatographic column 43 by a joint 42, about 30 meters of gas chromatographic column 43 length, its coiling is fixed on one to have in the insulation post case 45 of dish line plate 44, is provided with radiator fan 46 below dish line plate 44, to be incubated as required and to dispel the heat.The exit of gas chromatographic column 43 inserts the fid detector 47 that is arranged on the operator's console 1, the control of fid detector 47 analytic systems and the acquisition of data are finished by built-in computing machine, important GC parameter, as chromatogram column temperature, sampling beginning and the time that finishes, time that the cycle period of adsorption tube, desorb begin and finish and data obtain and can be provided with separately by computing machine.Computer software also can provide the automatic integration result of peak area according to the integral parameter of selecting, sample chromatogram peak qualitative distinguish by the retention time contrast with correct mixture and obtain, and utilizes the average carbon number response factor of instrument multiple spot calibration curve to carry out the quantitative Analysis of species concentration.Because the setting and the principle of work of fid detector 47 all are prior arts, just repeat no more.
In the foregoing description, can be covered with an outer case (not shown), each instrument that need operate and observe, button etc. are arranged on the outer case surface in the outside of operator's console and each device.
When the utility model uses, rotate hub 9 under the drive of motor 6 and gearing 7, under the effect of photoelectrical coupler and printing opacity positioning disk 10, rotation each time can make three adsorption tubes 14 (is example to have three working positions) on it be rotated simultaneously on sampling, thermal desorption and three working positions of purging.Adsorption tube 14 is when the sampling work position, sampling pump 26 starts, atmosphere enters sampling import 17 from draft tube 27, enter adsorption tube 14 by commutation plug 19, volatile organic matter in the gas is adsorbed two sections adsorbents adsorb in the pipe 14 at ambient temperature, and all the other materials under the effect of sampling pump 20, export 18 through commutation plug 19, sampling with gas, discharge from sampling pump 26, this adsorption process generally will be carried out about 30 minutes.Meanwhile, be positioned at the adsorption tube 14 of renovating 4 upper heaters, 5 belows and be in the thermal desorption working position, high temperature about 350 ℃ can make the atmospheric sample thermal desorption of adsorption tube 14 absorption, the carrier gas (high-purity hydrogen) that produce high-purity hydrogen generator 38 by a reversal valve 37 this moment is by carrier gas inlet 28 blowbacks (flow direction of carrier gas flow direction when sampling is opposite), in the enrichment pipe 36 that atmospheric sample is purged into be filled with ketjenblack EC further absorption concentrate, this carrier gas course of conveying also needed about 30 minutes.When enrichment pipe 36 carrier gas course of conveying are finished substantially, be arranged on its well heater 41 on every side and be warming up to 350 ℃ rapidly, atmospheric sample in the enrichment pipe 36 is by thermal desorption rapidly, simultaneously by reversal valve 37 commutations, carrier gas is entered from carrier gas inlet 29, and moment is blown into capillary chromatographic column 43 with the sample in the enrichment pipe 36 quickly.Because fixed phase stuffing is strong and weak different to the acting force of various chemical constitutions in the sample in the capillary chromatographic column 43, therefore various chemical constitutions from capillary chromatographic column 43 by and the time order and function difference that enters fid detector 47, thereby can realize effective separation of material.After various chemical constitutions in the atmospheric sample enter fid detector 47, according to the crest state variation and the peak area thereof of different chemical composition, can be at instantaneous kind and the content that detects different chemical composition of difference.
When above-mentioned sampling and thermal desorption process were carried out, the adsorption tube 14 that is in the purging working position was passed into the pressure-air that purges import and export 39 and purges cleaning.
Adopt the utility model on-line analyzer for atmospheric volatile organic compounds, can realize C in the atmosphere
4-C
12The continuous online acquisition analysis of trace volatile organic matter, analysis result is reliable and stable, can move continuously throughout the year, obtains the Changing Pattern of pollutant, and operating cost is low, and is easy to operate, has good user interface.The utility model both can be used for breadboard research, on-the-spot online acquisition analysis is continuously implemented in quarry sampling outside again, also being suitable for automatic monitor station in all parts of the country uses, thereby the rule that trace volatile organic content data and air quality change in the acquisition atmosphere is for the formulation of environmental policy provides reliable data to guarantee.
Claims (10)
1, a kind of on-line analyzer for atmospheric volatile organic compounds is characterized in that it comprises:
One operator's console;
One has the supporting seat that renovate two side and, and it is arranged on the described operator's console, is provided with sampling import and export and carrier gas import and export on the described two side at least;
One electric heater, it is arranged on described renovating;
One sampling pump, it connects described sampling outlet by pipeline, and described sampling import connects a draft tube;
One high-purity hydrogen generator, it connects two described carrier gas inlet respectively by a reversal valve;
The gearing of one driven by motor, it is arranged on an end of described supporting seat;
One rotates hub, and it is connected with the output terminal of described gearing, is arranged on rotationally between the described two side;
At least two adsorption tubes, it is connected on the holder that is provided with on the described rotation hub, is provided with two sections adsorbents in the described adsorption tube;
One support, its with described driven by motor to pass to device relative, be arranged on the described operator's console of described supporting seat one end;
One well heater, it is arranged on the described support;
One enrichment pipe, it exports connection with being connected described carrier gas, and is located in the described well heater, is provided with adsorbent in the described enrichment pipe;
One gas chromatographic column, the one end is connected with described enrichment pipe, and other end coiling is fixed in the insulation post case;
One fid detector, its input end connect described gas chromatographic column and are arranged on the described operator's console.
2, a kind of on-line analyzer for atmospheric volatile organic compounds as claimed in claim 1, it is characterized in that: in the close described carrier gas inlet of described enrichment pipe one side, be provided with a straight-through described commutation plug, described straight-through commutation plug axially is provided with a center pit that connects, and one screw axially is set at described commutation plug one end, in described screw, connect an outlet, described enrichment pipe is plugged in the described outlet, the middle part of described commutation plug is provided with the radial hole of the described center pit of a connection, and the both sides of described radial hole axially are respectively arranged with an O-ring seal.
3, a kind of on-line analyzer for atmospheric volatile organic compounds as claimed in claim 1, it is characterized in that: except that the close described carrier gas inlet of described enrichment pipe one side, being arranged on commutation plug in each import and export on the described supporting seat is an end and is semiclosed shape, the other end is provided with a center pit, be provided with the radial hole of the described center pit end of a connection at the middle part of described commutation plug, the both sides of described radial hole axially are respectively arranged with an O-ring seal.
4, a kind of on-line analyzer for atmospheric volatile organic compounds as claimed in claim 2, it is characterized in that: except that the close described carrier gas inlet of described enrichment pipe one side, being arranged on commutation plug in each import and export on the described supporting seat is an end and is semiclosed shape, the other end is provided with a center pit, be provided with the radial hole of the described center pit end of a connection at the middle part of described commutation plug, the both sides of described radial hole axially are respectively arranged with an O-ring seal.
5, as claim 1 or 2 or 3 or 4 described a kind of on-line analyzer for atmospheric volatile organic compounds, it is characterized in that: the output shaft outer end of the gearing on described supporting seat connects a printing opacity positioning disk, the corresponding photoelectrical coupler that also is provided with on described supporting seat with it.
6, as claim 1 or 2 or 3 or 4 described a kind of on-line analyzer for atmospheric volatile organic compounds, it is characterized in that: be provided with a dish line plate in the described insulation post case, described gas chromatographic column dish is established and is fixed on the described dish line plate, is provided with a radiator fan below the described dish line plate.
7, a kind of on-line analyzer for atmospheric volatile organic compounds as claimed in claim 5, it is characterized in that: be provided with a dish line plate in the described insulation post case, described gas chromatographic column dish is established and is fixed on the described dish line plate, is provided with a radiator fan below the described dish line plate.
8, as claim 1 or 2 or 3 or 4 or 7 described a kind of on-line analyzer for atmospheric volatile organic compounds, it is characterized in that: described enrichment pipe is the capillary quartz ampoule.
9, as claim 1 or 2 or 3 or 4 or 7 described a kind of on-line analyzer for atmospheric volatile organic compounds, it is characterized in that: 25～35 meters of described chromatogram column lengths.
10, a kind of on-line analyzer for atmospheric volatile organic compounds as claimed in claim 9 is characterized in that: 25～35 meters of described chromatogram column lengths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520001906 CN2769886Y (en) | 2005-01-31 | 2005-01-31 | Atmospheric volatile organic substance on-line analysis instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520001906 CN2769886Y (en) | 2005-01-31 | 2005-01-31 | Atmospheric volatile organic substance on-line analysis instrument |
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| CN2769886Y true CN2769886Y (en) | 2006-04-05 |
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| CN 200520001906 Expired - Fee Related CN2769886Y (en) | 2005-01-31 | 2005-01-31 | Atmospheric volatile organic substance on-line analysis instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198825A (en) * | 2015-04-30 | 2016-12-07 | 深圳鸿旺环保技术有限公司 | Volatile organic substance measuring system with multiple independent measuring subsystems |
-
2005
- 2005-01-31 CN CN 200520001906 patent/CN2769886Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106198825A (en) * | 2015-04-30 | 2016-12-07 | 深圳鸿旺环保技术有限公司 | Volatile organic substance measuring system with multiple independent measuring subsystems |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060405 |