CN105043846A - Volatile organic compound sample gas trapping system and method - Google Patents
Volatile organic compound sample gas trapping system and method Download PDFInfo
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- CN105043846A CN105043846A CN201510553231.XA CN201510553231A CN105043846A CN 105043846 A CN105043846 A CN 105043846A CN 201510553231 A CN201510553231 A CN 201510553231A CN 105043846 A CN105043846 A CN 105043846A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012855 volatile organic compound Substances 0.000 title abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 67
- 238000009833 condensation Methods 0.000 claims abstract description 30
- 230000005494 condensation Effects 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 58
- 239000005416 organic matter Substances 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000007710 freezing Methods 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 239000012159 carrier gas Substances 0.000 claims description 9
- 238000003795 desorption Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 claims description 5
- 238000004868 gas analysis Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 150000002894 organic compounds Chemical class 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 150000008282 halocarbons Chemical group 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000001301 oxygen Chemical group 0.000 description 2
- 229910052760 oxygen Chemical group 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a volatile organic compound sample gas trapping system and method and belongs to the field of environment monitoring. The system comprises a gas inlet device, a dewatering device and a trapping device. A condensation head of the dewatering device comprises a dewatering device cold trap, a dewatering pipe base and a passive metal dewatering pipe, wherein the gas inlet end of the passive metal dewatering pipe is connected with the gas inlet device, and the gas outlet end of the passive metal dewatering pipe is connected with the trapping device. A trapping head of the trapping device comprises a trapping device cold trap, a trapping pipe base and a passive metal trapping pipe, wherein the gas inlet end of the passive metal trapping pipe is connected with the dewatering device, the gas outlet end of the passive metal trapping pipe is connected with a gas analyzer, and the two ends of the passive metal trapping pipe are connected with a heating power source. Therefore, the system and method have the advantages that volatile organic compound gas concentration effect is good, and quantitative trapping can be achieved; energy consumption is low, and pollution is avoided; online or offline analysis of various polar or nonpolar volatile compounds can be achieved.
Description
Technical field
The present invention relates to a kind of sample gas trapping system and capture method, belong to environmental monitoring field, be specifically related to a kind of volatile organic matter sample gas trapping system and capture method.
Background technology
Organic compound in air measures by gas chromatography and gas chromatography/mass spectrometry method usually, such as the mensuration of Ozone in Environmental Air presoma hydrocarbon and poisonous and harmful halogenated hydrocarbons and oxygen-bearing organic matter.
In surrounding air, the concentration of organic compound is lower, is difficult to directly measure by analytical instrument; Therefore, need to the organic compound in air carry out concentrated after analyze.Concentrating instrument should meet: remove the moisture in sample, and to polarity, nonpolar all kinds of volatile organic compounds can both Absorption quantity and quantitatively desorb, and all kinds of volatile organic compounds, in concentrated and desorption process, chemical reaction and irreversible adsorption does not occur.
The method of current concentrated gas mainly contains adsorbent and concentrates with cryogenic freezing concentrated.But adsorbent has selective adsorption and irreversible adsorption, bad to the Adsorption and desorption effect of low boiling organic compound and polar organic compound.Refrigerating method has semiconductor refrigerating, compressor cooling; Semiconductor refrigerating effect is poor, and compressor cooling power consumption is high, volume large, quality weight, needs regularly to add freon refrigerant, contaminated environment.
Summary of the invention
Absorption and the desorption effect of the adsorption concentration method existing for the present invention mainly solves in prior art are bad, and the refrigerating effect that cryogenic freezing concentrates is poor, energy consumption large and the technical matterss such as contaminated environment, provides a kind of volatile organic matter sample gas trapping system and capture method.This trapping system and method concentrated effect good, energy consumption is little and pollution-free, can realize the quantitative trapping to volatile organic matter, can online or off-line analysis polarity and nonpolar all kinds of volatile organic matter.
To achieve these goals, according to an aspect of the present invention, provide a kind of volatile organic matter sample gas trapping system, comprising: the admission gear, de-watering apparatus, the capturing device that are connected successively;
Described de-watering apparatus comprises condensation head, and this condensation head comprises: what be connected with de-watering apparatus cold-trap removes water tube base, is wound in except the passive metal on water tube base is except water pipe; The inlet end that this passive metal removes water pipe is connected with admission gear, and outlet side is connected with capturing device;
Described capturing device comprises trapping head, and this trapping head comprises: the trapping base be connected with capturing device cold-trap, is wound in the passive metal trap tube on trapping base; The inlet end of described passive metal trap tube is connected with de-watering apparatus, and outlet side is connected with gas analysis instrument apparatus;
Further, the two ends of described passive metal trap tube are connected with heating power supply.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, the condensation head of described de-watering apparatus is two, and described metal trapping base is wound with the parallel passive metal trap tube of two-way, enters in the parallel passive metal trap tube of the two-way of capturing device from two condensation heads respectively after the gas of described admission gear collection is divided into two-way.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, described condensation head and described trapping head are equipped with temperature sensor respectively.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, described admission gear comprises the sampling head connected successively, six valves, solenoid valves, and described solenoid valve is connected with the inlet end of de-watering apparatus.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, the outlet side of the passive metal trap tube of described capturing device is connected with ten two-port valves, and the valve passage of this ten two-port valve is also connected to sampling pump, carrier gas bottle, and gas analyzer.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, the two ends that described passive metal removes water pipe are connected with heating power supply.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, the outside of the passive metal trap tube of the passive metal of described condensation head and described trapping head outside except water tube base is covered with stay-warm case.
Optimize, above-mentioned a kind of volatile organic matter sample gas trapping system, described six valves with described ten two-position valves are respectively arranged with six the valve heat blocks and ten two-position valve heat blocks that are connected with heating power supply.
To achieve these goals, according to another aspect of the present invention, provide a kind of method utilizing above-mentioned volatile organic matter sample gas trapping system to carry out the trapping of volatile organic matter sample gas, comprising:
Condensation water removal phase, passive metal sample pneumatic transmission being entered condensation head, except in water pipe, starts de-watering apparatus and coagulates trap refrigeration, control condensing temperature by the moisture removal in sample gas;
Freezing trapping step, enters in passive metal trap tube by the sample pneumatic transmission after the process of condensation water removal phase, starts capturing device and coagulates trap refrigeration, control chilling temperature by freezing for the volatile organic matter in sample gas trapping;
Heating desorption step, opens the heating power supply at described passive metal trap tube two ends, is heated, make it volatilize in freezing trapping step by cold volatile organic matter in passive metal trap tube;
To supply gas analytical procedure, utilize carrier gas that the escaping gas obtained in heating desorption step is delivered to gas analyzer.
Therefore, tool of the present invention has the following advantages: (1) volatile organic matter gas concentration is effective, can realize quantitative trapping; (2) energy consumption is little and pollution-free; (3) can online or off-line analysis polarity and nonpolar all kinds of volatile organic matter.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is condensation header structure schematic diagram of de-watering apparatus of the present invention.
Accompanying drawing 3 is trapping header structure schematic diagram of capturing device of the present invention.
In accompanying drawing 4 de-watering apparatus condensation of the present invention head, passive metal is except water pipe and power supply connection diagram.
Passive metal trap tube and power supply connection diagram in accompanying drawing 5 de-watering apparatus trapping of the present invention head.
Accompanying drawing 6 the present invention six valve heat blocks and power supply connection diagram.
Accompanying drawing 7 the present invention ten two-position valve heat block and power supply connection diagram.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.In figure, sampling head 1, six valves 2, six valve heat blocks 201, solenoid valve 3, de-watering apparatus 4, de-watering apparatus cold-trap 401, except water tube base 402, passive metal is except water pipe 403, de-watering apparatus stay-warm case 404, except water pipe temperature sensor 405, de-watering apparatus condenser temperature sensor 406, capturing device 5, capturing device cold-trap 501, trapping base 502, passive metal trap tube 503, capturing device stay-warm case 504, trap tube temperature sensor 505, capturing device condenser temperature sensor 506, ten two-port valves 6, ten two-position valve heat blocks 601, sampling pump 7, carrier gas bottle 8, and gas analyzer 9.
Embodiment:
As shown in Figure 1, a kind of volatile organic matter sample gas trapping system, comprise: sampling head 1, six valves 2, solenoid valves 3 of being connected successively, solenoid valve 3, de-watering apparatus 4, capturing device 5, ten two-port valve 6, the valve passage of this ten two-port valve 6 is also connected to sampling pump 7, carrier gas bottle 8, and gas analyzer 9.
As shown in Figure 2, de-watering apparatus 4 comprises condensation head.This condensation head comprises: what be connected with de-watering apparatus cold-trap 401 removes water tube base 402, is wound in except the passive metal on water tube base 402 is except water pipe 403; The inlet end that this passive metal removes water pipe 403 is connected with solenoid valve 3, and outlet side is connected with capturing device 5, and the passive metal of condensation head removes water tube base 402 outside and is covered with stay-warm case.
As shown in Figure 3, capturing device comprises trapping head, and this trapping head comprises: the trapping base 502 be connected with capturing device cold-trap 501, is wound in the passive metal trap tube 503 on trapping base 502; The inlet end of passive metal trap tube 503 is connected with the outlet side of passive metal except water pipe 403, and outlet side is connected with ten two-port valves 6.The outside of the passive metal trap tube 504 of trapping head is covered with stay-warm case.
As shown in figs. 4-7, passive metal is all connected with heating power supply except the two ends of water pipe 403 and the two ends of passive metal trap tube 503, and six valves 2 with ten two-position valves 6 are respectively arranged with six the valve heat blocks 201 and ten two-position valve heat blocks 601 that are connected with heating power supply.
In the embodiment of the present invention, the condensation head of de-watering apparatus is preferably two, and metal trapping base 502 is wound with the parallel passive metal trap tube 503 of two-way, enters in the parallel passive metal trap tube 503 of the two-way of capturing device from two condensation heads respectively after the gas of admission gear collection is divided into two-way.
After adopting said structure, the method that the present invention carries out gas trapping comprises the following steps:
Condensation water removal phase, sample pneumatic transmission is entered the passive metal of condensation head except in water pipe 403, startup de-watering apparatus coagulates trap 401 and freezes, by the moisture removal in sample gas; Low-temperature water removal arrives required low temperature by the passive metal of cold-trap 401 pairs of condensation heads except water pipe 403 freezes, aqueous vapor in the gas flowed through is condensate in except realizing in water pipe, it is controlled that cryogenic temperature is adjustable, temperature measures with except water pipe temperature sensor 405, de-watering apparatus condenser temperature sensor 406, only dewaters not except the object of volatile organic matter to reach; The de-watering apparatus cold-trap that the present invention uses is a kind of commodity refrigeration machine, and cryogenic temperature controllable is at-120 DEG C to-50 DEG C.
Freezing trapping step, enters in passive metal trap tube 503 by the sample pneumatic transmission after the process of condensation water removal phase, startup capturing device coagulates trap 501 and freezes, by freezing for the volatile organic matter in sample gas trapping; First capturing device cold-trap 501 freezes to the metal trapping base 502 of trapping head, metal trapping base 502 is freezed to passive metal trap tube 503 by heat transfer, it is controlled that cold-trap cryogenic temperature is adjustable, minimum can to-150 DEG C, temperature trap tube temperature sensor 505, capturing device condenser temperature sensor 506 measure; Volatile organic matter is frozen and is captured on passivation empty metal trap tube 503 inwall;
Heating desorption step, opens the heating power supply at passive metal trap tube 503 two ends, is heated, make it volatilize in freezing trapping step by cold volatile organic matter in passive metal trap tube 503; It is controlled that heating-up temperature is adjustable, can fast quantification desorb to reach all kinds of volatile organic matters that are captured; Power supply is adopted directly to be better than thermal diffusion heating to passive metal trap tube 503 heating effect;
To supply gas analytical procedure, utilize carrier gas that the escaping gas obtained in heating desorption step is delivered to gas analyzer.The volatile organic matter of desorb enters ten two-port valves 6 under the purging of carrier gas (bottle) 8, then enters gas analyzer 9 and analyzes;
Trapping system 4 has three injection ports, respectively collected specimens gas, external standard gas and interior gas body (not embodying in the drawings); Sample feeding mouthpiece has continuous sample introduction and single sample introduction function, is respectively used to on-line continuous analysis and off-line analysis;
Trapping system of the present invention also can with any analytic system coupling; It is online that gas analyzer 9 is preferably a kind of gas chromatograph/mass spectrum, gas chromatography is configured with two shunting/Splitless injecting samples devices, two chromatographic columns are installed, configuration hydrogen flame ionization detector (FID) and mass detector (MS), are equipped with NIST and compose storehouse; Analytic system to the hydrocarbon of trapping system trapping, halogenated hydrocarbons and can carry out qualitative and quantitative analysis containing oxygen volatile organic matter.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ sampling head 1 herein, six valves 2, six valve heat blocks 201, solenoid valve 3, de-watering apparatus 4, de-watering apparatus cold-trap 401, except water tube base 402, passive metal is except water pipe 403, de-watering apparatus stay-warm case 404, except water pipe temperature sensor 405, de-watering apparatus condenser temperature sensor 406, capturing device 5, capturing device cold-trap 501, trapping base 502, passive metal trap tube 503, capturing device stay-warm case 504, trap tube temperature sensor 505, capturing device condenser temperature sensor 506, ten two-port valves 6, ten two-position valve heat blocks 601, sampling pump 7, carrier gas bottle 8, and the term such as gas analyzer 9, but do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (9)
1. a volatile organic matter sample gas trapping system, comprising: the admission gear, de-watering apparatus (4), the capturing device (5) that are connected successively, is characterized in that:
Described de-watering apparatus (4) comprises condensation head, this condensation head comprises: what be connected with de-watering apparatus cold-trap (401) removes water tube base (402), is wound in except the passive metal on water tube base (402) is except water pipe (403); The inlet end that this passive metal removes water pipe (403) is connected with admission gear, and outlet side is connected with capturing device;
Described capturing device comprises trapping head, and this trapping head comprises: the trapping base (502) be connected with capturing device cold-trap (501), is wound in the passive metal trap tube (503) in trapping base (502); The inlet end of described passive metal trap tube (503) is connected with de-watering apparatus, and outlet side is connected with gas analysis instrument apparatus;
Further, the two ends of described passive metal trap tube (503) are connected with heating power supply.
2. a kind of volatile organic matter sample gas trapping system according to claim 1, it is characterized in that, the condensation head of described de-watering apparatus is two, and described metal trapping base (502) is wound with the passive metal trap tube (503) that two-way is parallel, enters in the parallel passive metal trap tube (503) of the two-way of capturing device from two condensation heads respectively after the gas of described admission gear collection is divided into two-way.
3. a kind of volatile organic matter sample gas trapping system according to claim 1, is characterized in that, described condensation head and described trapping head are equipped with temperature sensor respectively.
4. a kind of volatile organic matter sample gas trapping system according to claim 1, it is characterized in that, described admission gear comprises the sampling head (1) connected successively, six valves (2), solenoid valve (3), and described solenoid valve (3) is connected with the inlet end of de-watering apparatus.
5. a kind of volatile organic matter sample gas trapping system according to claim 1, it is characterized in that, the outlet side of the passive metal trap tube (503) of described capturing device is connected with ten two-port valves (6), and the valve passage of this ten two-port valve (6) is also connected to sampling pump (7), carrier gas bottle (8), and gas analyzer (9).
6. a kind of volatile organic matter sample gas trapping system according to claim 1, is characterized in that, the two ends that described passive metal removes water pipe (403) are connected with heating power supply.
7. a kind of volatile organic matter sample gas trapping system according to claim 1, it is characterized in that, the outside of the passive metal trap tube (504) of the passive metal of described condensation head and described trapping head outside except water tube base (402) is covered with stay-warm case.
8. a kind of volatile organic matter sample gas trapping system according to claim 1, it is characterized in that, described six valves (2) with described ten two-position valves (6) are respectively arranged with six the valve heat blocks (201) and ten two-position valve heat blocks (601) that are connected with heating power supply.
9. utilize the volatile organic matter sample gas trapping system described in claim 1 to carry out a method for volatile organic matter sample gas trapping, it is characterized in that, comprising:
Condensation water removal phase, passive metal sample pneumatic transmission being entered condensation head, except in water pipe (403), starts de-watering apparatus and coagulates trap (401) refrigeration, control condensing temperature by the moisture removal in sample gas;
Freezing trapping step, enters the sample pneumatic transmission after the process of condensation water removal phase in passive metal trap tube (503), starts capturing device and coagulates trap (501) refrigeration, control chilling temperature by freezing for the volatile organic matter in sample gas trapping;
Heating desorption step, opens the heating power supply at described passive metal trap tube (503) two ends, is heated, make it volatilize in freezing trapping step by cold volatile organic matter in passive metal trap tube (503);
To supply gas analytical procedure, utilize carrier gas that the escaping gas obtained in heating desorption step is delivered to gas analyzer.
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| CN201510553231.XA CN105043846A (en) | 2015-09-01 | 2015-09-01 | Volatile organic compound sample gas trapping system and method |
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| CN108226322A (en) * | 2017-12-12 | 2018-06-29 | 优泰科技（深圳）有限公司 | A kind of low temperature concentrating instrument and control method |
| CN108693307A (en) * | 2018-04-11 | 2018-10-23 | 昆明和宸科技有限公司 | VOCs detection methods in a kind of air |
| CN108956232A (en) * | 2018-08-03 | 2018-12-07 | 中国核动力研究设计院 | It is a kind of biology sample in carbon-14 method for making sample and sample making apparatus |
| CN109358143A (en) * | 2018-12-05 | 2019-02-19 | 成都科林分析技术有限公司 | A kind of water-eliminating method, sample injection method and its device for gas concentration sampling |
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| CN111060386A (en) * | 2019-12-18 | 2020-04-24 | 江苏国技仪器有限公司 | Method and device for removing and enriching water of volatile organic compounds in ambient air |
| CN114563509A (en) * | 2022-02-21 | 2022-05-31 | 广东盈峰科技有限公司 | System and method for enriching trace organic matters in air |
| CN115060569A (en) * | 2022-08-17 | 2022-09-16 | 常州磐宇仪器有限公司 | Rapid enrichment system and method for soil VOCs analysis and detection |
| CN115856176A (en) * | 2023-02-06 | 2023-03-28 | 北京鹏宇昌亚环保科技有限公司 | VOCs pre-concentration processing assembly and processing method in environment monitoring instrument |
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