CN203443939U - Sampling and analyzing device for volatile organic materials in air - Google Patents
Sampling and analyzing device for volatile organic materials in air Download PDFInfo
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- CN203443939U CN203443939U CN201320571410.2U CN201320571410U CN203443939U CN 203443939 U CN203443939 U CN 203443939U CN 201320571410 U CN201320571410 U CN 201320571410U CN 203443939 U CN203443939 U CN 203443939U
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Abstract
The utility model discloses a sampling and analyzing device for volatile organic materials in air. The sampling and analyzing device comprises a low-temperature environmental box and an air sampler; a low-temperature cold trap device is arranged in the low-temperature environmental box and comprises a first cold trap, a second cold trap and a third cold trap; the first cold trap comprises a first condensation tube and a first semiconductor refrigeration chip set; a first heater strip is wound on the first condensation tube; the second cold trap comprises a second condensation tube and a second semiconductor refrigeration chip set; a second heater strip is wound on the second condensation tube; the third cold trap comprises a third condensation tube and a third semiconductor refrigeration chip set. The sampling and analyzing device for volatile organic materials in air can satisfy the requirements for on-line monitoring of the content of volatile organic materials and can be used for real-time and on-line automatic detection of the content of volatile organic materials in air.
Description
Technical field
The utility model relates to atmospheric environment checkout equipment technical field, specifically, relates to a kind of atmospheric volatile organic compounds sampling analysis device.
Background technology
The volatility containing in atmosphere, mostly there is the harm such as teratogenesis, carcinogenic, mutagenesis, and be the important arch-criminal of the phenomenons such as atmospheric photochemistry harm, greenhouse effect, therefore for the pollution level of atmosphere is monitored in time and is controlled, atmospheric volatile organic compounds content is carried out to detecting in real time seems becomes more and more important, especially volatile organic content is carried out to on-line monitoring and become more and more important.At present, atmospheric volatile organic compounds is detected mainly and completed by stratographic analysis.Because the volatile organic matter kind in atmosphere is many, and concentration is low, must carry out enrichment concentration (the micro substance in atmospheric being become to solid-state reduced volume), just can reach the requirement that analytical instrument detects.And for concerning volatile organic content is carried out on-line monitoring, concentration systems is had relatively high expectations, should reach following condition: do not consume cold-producing medium, enrichment desorption rate is fast, to shorten the analytical cycle of monitoring automatically.
At present, the device concentrated for laboratory volatile organic matter condensation generally used liquid nitrogen refrigerating, directly liquid nitrogen sprayed in the evaporator of cold-trap outside, utilizes liquid nitrogen vaporization to absorb heat and freezes.For example in Chinese patent CN101337135, propose a kind of cryotrap, solved the consumption problem of condensing agent, and shortened concentration time.But the method liquid nitrogen consumption is large, refrigeration cost is higher, and liquid nitrogen field is changed simultaneously, store difficulty, and analytical cycle is long, and for operation and maintenance brings very big inconvenience, so it is not suitable for continuous on-line monitoring.And at present in technology, in cryotrap, generally use poriness adsorbent, volatile organic matter is carried out to Rapid Thermal desorb again after cryosorption, in this process, be easy to produce cross pollution and " memory effect ".Therefore, current condensation enrichment facility and condensation method for concentration can not meet the needs to volatile organic content on-line monitoring.In addition, use poriness adsorbent adsorbing volatilizing organic matter, desorption time is long, whole analytical cycle is lengthened, and easily between different sample analysis, produce cross-contamination issue.Have again, in atmosphere, volatile organic matter is of a great variety, in the time need to using gas chromatograph to analyze the volatile organic content in atmosphere, need to analyze tens kinds and even hundreds of kind carbon containing class material, the many uses of gas chromatograph at present have the gas chromatographs of a capillary separation column, because single capillary column is to all volatile organic matter poor selectivity in atmosphere, cause separation efficiency low, generally need to surpass the long capillary column of 60m, could realize the complete separation to material, cause and require the requirement of system sample introduction pressure high, the shortcomings such as analytical cycle length.
Utility model content
Technical problem to be solved in the utility model is: a kind of cold-producing medium, enrichment desorption rate is fast and analytical cycle is short atmospheric volatile organic compounds sampling analysis device of not consuming is provided.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of atmospheric volatile organic compounds sampling analysis device, comprising:
Environmental chamber at low temperature, described environmental chamber at low temperature is connected with compressor, in described environmental chamber at low temperature, be provided with cryotrap device, described cryotrap device comprises the first cold-trap, the second cold-trap and the 3rd cold-trap, described the first cold-trap comprises the first condenser pipe and the first semiconductor chilling plate group, on described the first condenser pipe, is wound with the first heater strip; Described the second cold-trap comprises the second condenser pipe and the second semiconductor chilling plate group, on described the second condenser pipe, is wound with the second heater strip; Described the 3rd cold-trap comprises the 3rd condenser pipe and the 3rd semiconductor chilling plate group, on described the 3rd condenser pipe, is wound with the 3rd heater strip;
Air sampler, the output terminal of described air sampler is connected to the input end of mass flowmeter, the output terminal of described mass flowmeter is connected to the first end of the first multiport valve, the second end of described the first multiport valve is connected with carrier gas source of the gas, and the 3rd end of described the first multiport valve is connected to the entrance point of described the first condenser pipe;
The endpiece of described the first condenser pipe is connected to the 3rd end of the second multiport valve, and the first end of described the second multiport valve is connected with the entrance point of described the second condenser pipe, and the second end of described the second multiport valve is connected with the entrance point of described the 3rd condenser pipe;
The endpiece of described the second condenser pipe is connected to the 3rd end of the 3rd multiport valve, and the first end of described the 3rd multiport valve is connected with blowback source of the gas, and the second end of described the 3rd multiport valve is connected to the first chromatographic detection input end;
The endpiece of described the 3rd condenser pipe is connected to the 3rd end of the 4th multiport valve, and the first end of described the 4th multiport valve is connected with described blowback source of the gas, and the second end of described the 4th multiport valve is connected to the second chromatographic detection input end.
Preferably, in described environmental chamber at low temperature, be provided with the first refrigeration cavity, the second refrigeration cavity and the 3rd refrigeration cavity; Described the first condenser pipe and described the first heater strip are arranged in described the first refrigeration cavity, described the second condenser pipe and described the second heater strip are arranged in described the second refrigeration cavity, and described the 3rd condenser pipe and described the 3rd heater strip are arranged in described the 3rd refrigeration cavity.
Preferably, be also connected with semipermeable partition except water pipe between the second end of described the second multiport valve and the entrance point of described the 3rd condenser pipe, described semipermeable partition removes water pipe outer cover and is provided with drying tube.
Preferably, described semipermeable partition is except being also connected with pressure valve between the endpiece of water pipe and the entrance point of described the 3rd condenser pipe.
Preferably, described the first semiconductor chilling plate group comprises the semiconductor chilling plate of two that fit together above and electrical connections in parallel, described the second semiconductor chilling plate group comprises the semiconductor chilling plate of three that fit together above and electrical connections in parallel, and described the 3rd semiconductor chilling plate group comprises the semiconductor chilling plate of two that fit together above and electrical connections in parallel.
Preferably, the outside of described the first refrigeration cavity, described the second refrigeration cavity and described the 3rd refrigeration cavity is enclosed with respectively heat-insulating material.
Preferably, described the first condenser pipe, described the second condenser pipe and described the 3rd condenser pipe are stainless steel condenser pipe.
Preferably, described carrier gas source of the gas and described blowback source of the gas are the inert gas that purity is greater than 99.9%.
Adopted after technique scheme, the beneficial effects of the utility model are:
1. due to atmospheric volatile organic compounds sampling analysis device of the present utility model, employing be semiconductor refrigerating technology, and semiconductor refrigerating technology utilizes the paltie effect refrigeration of semiconductor material, does not need cold-producing medium, after energising, directly freezes.The advantage such as semiconductor refrigerating has can continuous cooling, fast, the shockproof noise of refrigerating speed, life-span are long, convenient for installation and maintenance, can also realize accurate refrigeration, automatic controlling system process of refrigerastion easy to use.The refrigeration system of this technology can meet the needs to volatile organic content on-line monitoring.Therefore apply the atmospheric volatile organic compounds sampling analysis device of the present utility model of this Refrigeration Technique, overcome traditional cryogenic condensation device due to the defect that needs liquid nitrogen refrigerating and poriness adsorbent to exist: liquid nitrogen consumption is large, refrigeration cost is higher, liquid nitrogen field is changed simultaneously, stores difficulty; Poriness adsorbent heat desorption rate is slow, the residual height of component, and required purge time is long, thereby causes the shortcomings such as analytical cycle length, can be used for the online automatic detection on the spot of atmospheric volatile organic compounds content.In addition, atmospheric volatile organic compounds sampling analysis device of the present utility model in the course of the work, switch by the first multiport valve, the second multiport valve, the 3rd multiport valve and the 4th multiport valve is controlled and the setting of the first cold-trap, the second cold-trap and the 3rd cold-trap different temperatures, makes in atmosphere to enter the second chromatograph containing six carbon atom and above volatile organic matter after by the first cold-trap and the 3rd cold-trap and detects analysis.And in atmosphere, remaining volatile organic matter enters the first chromatograph after by the second cold-trap and detects analysis, and this setting can adopt capillary column of different nature and dissimilar detecting device to the first and second chromatographs, increased the responsiveness of whole analytic system to heterogeneity volatile organic matter.
2. owing to being also connected with semipermeable partition between the second end of described the second multiport valve and the entrance point of described the 3rd condenser pipe except water pipe, described semipermeable partition removes water pipe outer cover and is provided with drying tube.Therefore atmospheric volatile organic compounds sampling analysis device of the present utility model combines with the semi-permeable technology of dewatering by segmentation condensation is concentrated, make in atmosphere containing six carbon atom to containing the volatile organic matter of 12 carbon atoms through semipermeable partition during except water pipe, further remove moisture wherein, the elimination of maximum possible moisture on stratographic analysis impact, make it enter that to detect the result of analyzing after the second chromatograph more accurate.
3. because the first condenser pipe in the utility model, the second condenser pipe and the 3rd condenser pipe all adopt stainless steel condenser pipe, therefore in condensation process, directly condensation on stainless-steel pipe of component, but not condensation on traditional poriness sorbing material, maximum possible avoided cross pollution between different analytical cycles and " memory " effect of system.
4. because atmospheric volatile organic compounds sampling analysis device of the present utility model is used highly purified inert gas, the first condenser pipe, the second condenser pipe and the 3rd condenser pipe are carried out to blowback, and in condenser pipe containing poriness sorbing material, purging speed is fast, greatly improved thermal desorption speed, self-cleaning that in a short period of time can completion system, shortens analytical cycle.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Fig. 1 is the principle schematic of atmospheric volatile organic compounds sampling analysis device of the present utility model;
In figure: 1, environmental chamber at low temperature; 2, the first refrigeration cavity; 21, the first condenser pipe; 22, the first heater strip; 3, the first semiconductor chilling plate group; 4, the second refrigeration cavity; 41, the second condenser pipe; 42, the second heater strip; 5, the second semiconductor chilling plate group; 6, the 3rd refrigeration cavity; 61, the 3rd condenser pipe; 62, the 3rd heater strip; 7, the 3rd semiconductor chilling plate group; 8, air sampler; 9, mass flowmeter; 10, the first multiport valve; 11, carrier gas source of the gas; 12, the second multiport valve; 13, the 3rd multiport valve; 14, the 4th multiport valve; 15, blowback source of the gas; 16, the first chromatograph; 17, the second chromatograph; 18, compressor; 19, semiconductor chilling plate; 20, semipermeable partition is except water pipe; 30, drying tube; 40, pressure valve.
Embodiment
Fig. 1 is the principle schematic of atmospheric volatile organic compounds sampling analysis device of the present utility model, with reference to Fig. 1, atmospheric volatile organic compounds sampling analysis device of the present utility model, comprises environmental chamber at low temperature 1 and air sampler 8, and air sampler 8 has dedusting function.
Environmental chamber at low temperature 1 is connected with compressor, in environmental chamber at low temperature 1, be provided with cryotrap device, cryotrap device comprises the first cold-trap, the second cold-trap and the 3rd cold-trap, the first cold-trap comprises on the first condenser pipe 21 and the first semiconductor chilling plate group 3, the first condenser pipes 21 and is wound with the first heater strip 22; The second cold-trap comprises on the second condenser pipe 41 and the second semiconductor chilling plate group 5, the second condenser pipes 41 and is wound with the second heater strip 42; The 3rd cold-trap comprises on the 3rd condenser pipe 61 and the 3rd semiconductor chilling plate group 7, the three condenser pipes 61 and is wound with the 3rd heater strip 62.Wherein, the first condenser pipe 21, the second condenser pipe 41 and the 3rd condenser pipe 61 all adopt stainless steel material to make, and inside surface is through Passivation Treatment.So in condensation process, directly condensation on stainless-steel pipe of component, but not condensation on traditional poriness sorbing material, thermal desorption speed is fast, and " memory " effect of having avoided cross pollution and system of maximum possible.
The output terminal of air sampler 8 is connected to the input end of mass flowmeter 9, the output terminal of mass flowmeter 9 is connected to the first end of the first multiport valve 10, the 3rd end that the second end of the first multiport valve 10 is connected with carrier gas source of the gas 11, the first multiport valves 10 is connected to the entrance point of the first condenser pipe 21.
The endpiece of the second condenser pipe 41 is connected to the 3rd end of the second multiport valve 12, and the first end of the second multiport valve 12 is connected with the entrance point of the second condenser pipe 41, and the second end of the second multiport valve 12 is connected with the entrance point of the 3rd condenser pipe 61.In the present embodiment, between the second end of the second multiport valve 12 and the entrance point of the 3rd condenser pipe 61, be also connected with semipermeable partition except water pipe 20, the outside that semipermeable partition removes water pipe 20 is also arranged with drying tube 30, and semipermeable partition is except being also connected with pressure valve 40 between the endpiece of water pipe 20 and the entrance point of the 3rd condenser pipe 61.It is Nafion semi-permeable film that semipermeable partition removes water pipe 20, water permeates by the semi-permeable membranous wall of Nafion, and evaporation subsequently enters in surrounding air, and we call " pervaporation " this process, played the function dewatering, the inside and outside moist gradient of pipe has driven whole process.And pressure valve 40 keeps certain malleation while having kept the inherent work of Nafion semipermeable partition pipe.Make Nafion semipermeable partition pipe play good water removal effect to the volatile organic matter in atmosphere.
The endpiece of the second condenser pipe 41 is connected to the 3rd end of the 3rd multiport valve 13, and the first end of the 3rd multiport valve 13 is connected with blowback source of the gas 15, and the second end of the 3rd multiport valve 13 is connected to the detection input end of the first chromatograph 16.The concentrated sampler of atmospheric volatile organic compounds condensation of the present utility model and analytic system thereof are used highly purified inert gas to carry out blowback to the first condenser pipe, the second condenser pipe and the 3rd condenser pipe, purging speed is fast, greatly improved thermal desorption speed, self-cleaning that in a short period of time can completion system, has shortened analytical cycle.
The endpiece of the 3rd condenser pipe 61 is connected to the 3rd end of the 4th multiport valve 14, and the first end of the 4th multiport valve 14 is connected with blowback source of the gas 15, and the second end of the 4th multiport valve 14 is connected to the detection input end of the second chromatograph 17.
The first chromatograph 16 and the second chromatograph 17 are two independently chromatograph analytic systems, in-built capillary column of different nature.The first chromatograph 16 and the second chromatograph 17 are gas chromatograph or gas chromatograph-mass spectrometer.
In environmental chamber at low temperature 1, be provided with the first refrigeration cavity 2, the second refrigeration cavity 4 and the 3rd refrigeration cavity 6; The first condenser pipe 21 and the first heater strip 22 are arranged in the first refrigeration cavity 2, and the second condenser pipe 41 and the second heater strip 42 are arranged in the second refrigeration cavity 4; The 3rd condenser pipe 61 and the 3rd heater strip 62 are arranged in the 3rd refrigeration cavity 6.In the present embodiment, according to the needs of volatile organic matter condensing temperature, the first semiconductor chilling plate group 3 comprises the semiconductor chilling plate 19 of two that fit together above and electrical connections in parallel, the second semiconductor chilling plate group 5 comprise three of quantity that fit together above and in parallel be electrically connected to semiconductor chilling plate 19, the three semiconductor chilling plate groups 7 comprise the semiconductor chilling plate 19 of two that fit together above and electrical connections in parallel.Wherein, by the first semiconductor cooling sheet group 3 processed, provide refrigeration for the first refrigeration cavity 2, by the second semiconductor chilling plate group 5, provide refrigeration for the second refrigeration cavity 4, by the 3rd semiconductor chilling plate group 7, provide refrigeration for the 3rd refrigeration cavity 6.
In the present embodiment, the outside of the first refrigeration cavity 2, the second refrigeration cavity 4 and the 3rd refrigeration cavity 6 is enclosed with respectively heat-insulating material.The first multiport valve 10, the second multiport valve 12, the 3rd multiport valve 13 and the 4th multiport valve 14 are various way solenoid valve.The first condenser pipe 21, the second condenser pipe 41 and the 3rd condenser pipe 61 are straight shape, snakelike or spirality winding.
Carrier gas source of the gas 11 and blowback source of the gas 15 are the inert gas that purity is greater than 99.9%.In the present embodiment, carrier gas source of the gas 11 and blowback source of the gas 15 are the helium that purity is greater than 99.9%.Certainly, also can adopt other inert gas.Wherein, the meaning of carrier gas: in vapor-phase chromatography, mobile phase is gas, is called carrier gas.The effect of carrier gas is with certain flow velocity carrier band gaseous sample or the sample gas after gasification, to enter together chromatographic column to carry out separation, again each component after separated being written into detecting device detects, finally flow out condenser system emptying or collection, carrier gas has been carrier band effect and substantially do not participate in centrifugation.
Adopt the sampling and analyzing method of atmospheric volatile organic compounds sampling analysis device of the present utility model to comprise the following steps:
A. first start environmental chamber at low temperature 1, make it in refrigerating state, make the first refrigeration cavity 2 and the first condenser pipe 21 reach the low temperature of-40 ℃ to-50 ℃, preferably 45 ℃, make the second refrigeration cavity 4 and the second condenser pipe 41 reach the low temperature of-145 ℃ to-155 ℃, preferably 150 ℃, make the 3rd refrigeration cavity 6 and the 3rd condenser pipe 61 reach the low temperature of-55 ℃ to-65 ℃, preferably 60 ℃;
B. atmospheric volatile organic compounds is after air sampler 8 samplings, control the first multiport valve 10 and the second multiport valve 12, air sampler 8 is communicated with environmental chamber at low temperature 1, the first condenser pipe 21 is communicated with the second condenser pipe 41, atmospheric sample is quantitatively sent in environmental chamber at low temperature 1 by mass flowmeter 9, first enter the first refrigeration cavity 2 and carry out condensation, the boiling point containing six carbon atom and above volatile organic compounds and moisture in atmospheric sample is higher, first be condensed in the first condenser pipe 21, change into solid-state; And the lower volatile organic matter of boiling point is mainly containing higher other volatile organic matter components such as formaldehyde, methyl alcohol and methane of content in five carbon atoms and following compound, especially atmosphere, enter in the second condenser pipe 41, be converted into solid-state; And other permanent gases in atmosphere, such as nitrogen, oxygen etc., because boiling point is lower, is not condensed into solid-state, and directly emptying by the 3rd multiport valve 13;
C. treat that sampling reaches aequum, balance is after a period of time, control the first multiport valve 10, control the second multiport valve 12, disconnect the gas flow of mass flowmeter 9 and the first condenser pipe 21, making the first condenser pipe 21 and semipermeable partition remove water pipe 20 is communicated with, opening pressure valve 40 removes semipermeable partition in water pipe 20, to keep certain malleation, open the first heater strip 22 in the first refrigeration cavity 2, make the temperature of the first condenser pipe 21 in the first refrigeration cavity 1 be raised to 30 ℃, and control the first multiport valve 10, carrier gas source of the gas 11 is communicated with the first condenser pipe 21; In the first condenser pipe 21, be heated to 30 ℃, now, water is in liquid state, vapour pressure is very low, and other is condensed in the volatile organic matter component in the first condenser pipe 21, after being heated to 30 ℃ of gasifications, transfers in gas phase, and purged into semipermeable partition and further dewater except in water pipe 20 by carrier gas source of the gas 11, then entering the 3rd condenser tube 61, to carry out cryogenic condensation concentrated, and carrier gas is emptying by the 4th multiport valve 14;
D.5-10 minute after, close the second multiport valve 12 and pressure valve 40, open the 3rd heater strip 62 on the 3rd condenser pipe 61, make the 3rd condenser pipe 61 be heated to 45 ℃ to 55 ℃, preferably 50 ℃, now the volatile organic matter in the 3rd condenser pipe 61 all changes gaseous state into, and by carrier gas source of the gas 11, is written into the second chromatograph 17 and detects analysis, completes the detection analysis containing six carbon atom and above volatile organic compounds in atmospheric sample;
E. simultaneously, sampling quantity reach set quantitatively after, control the second multiport valve 12, the off-state that keeps the first condenser pipe 21 and the second condenser pipe 41, open the second heater strip 42 on the second condenser pipe 41, make temperature increase to 45 in the second condenser pipe 41 ℃ to 55 ℃, preferably 50 ℃, make the solid-state volatile organic matter in the second condenser pipe 41 change gaseous state into, and by carrier gas source of the gas 11, be written into the first chromatograph 16 and detect analysis, complete in atmospheric sample the detection analysis containing five carbon atoms and following volatile organic matter;
F. complete after said process, stop the refrigerating state of environmental chamber at low temperature 1, open the first heater strip 22, the second heater strip 42 and the 3rd heater strip 62, make the first condenser pipe 21, the second condenser pipe 41 and the 3rd condenser pipe 61 temperature be elevated to 295 ℃ to 305 ℃, preferably 300 ℃, control the first multiport valve 10, the second multiport valve 12, the 3rd multiport valve 13 and the 4th multiport valve 14, blowback source of the gas 15 is communicated with the second condenser pipe 41 and the 3rd condenser pipe 61, and be communicated with the first condenser pipe 21, carry out blowback cleaning, purge gas is emptying by the first multiport valve 10;
G. after blowback process completes, close the first heater strip 22, the second heater strip 42 and the 3rd heater strip 62, and reopen environmental chamber at low temperature 1 and make it in refrigerating state, the first refrigeration cavity 2, the second refrigeration cavity 4 and the 3rd refrigeration cavity 6 are reached and set temperature, for next time sampling and condensation concentration ready.
From the above-mentioned course of work of atmospheric volatile organic compounds sampling analysis device of the present utility model, can find out, atmospheric volatile organic compounds sampling analysis device of the present utility model, what adopt is semiconductor refrigerating technology, and semiconductor refrigerating technology utilizes the paltie effect refrigeration of semiconductor material, do not need cold-producing medium, after energising, directly freeze.The advantage such as semiconductor refrigerating has can continuous cooling, fast, the shockproof noise of refrigerating speed, life-span are long, convenient for installation and maintenance, can also realize accurate refrigeration, automatic controlling system process of refrigerastion easy to use.Meanwhile, the stainless-steel tube that the condenser pipe that the utility model patent adopts is hollow, does not need to fill traditional poriness sorbing material; The refrigeration system of this technology can meet the needs to volatile organic matter on-line real time monitoring.Therefore apply the atmospheric volatile organic compounds sampling analysis device of the present utility model of this Refrigeration Technique, overcome traditional cryogenic condensation device due to the defect that needs liquid nitrogen refrigerating to exist: liquid nitrogen consumption is large, refrigeration cost is higher, and liquid nitrogen field is changed simultaneously, stores difficulty; Meanwhile, the stainless-steel tube thermal desorption speed of hollow is fast, purges easily, makes system scavenging period short, has shortened the analytical test cycle, can be used for the online automatic detection on the spot of atmospheric volatile organic compounds content.
In addition, atmospheric volatile organic compounds sampling analysis device of the present utility model in the course of the work, switch by the first multiport valve 10, the second multiport valve 12, the 3rd multiport valve 13 and the 4th multiport valve 14 is controlled and the setting of the first cold-trap, the second cold-trap and the 3rd cold-trap different temperatures, makes in atmosphere to enter the second chromatograph 17 containing six carbon atom and above volatile organic matter after by the first cold-trap and the 3rd cold-trap and detects analysis.And in atmosphere, remaining volatile organic matter enters the first chromatograph 16 after by the second cold-trap and detects analysis.This shows, atmospheric volatile organic compounds sampling analysis device of the present utility model can be divided into the volatile organic matter in atmosphere and enters respectively two chromatographs after two classes and detect analysis, and two chromatographs can adopt chromatographic column of different nature and dissimilar detecting device, improve the responsiveness of chromatograph to different volatile organic matters, and improved detection analysis precision.
Atmospheric volatile organic compounds sampling analysis device of the present utility model combines with the semi-permeable technology of dewatering by segmentation condensation is concentrated, make in atmosphere containing six carbon atom and above volatile organic matter through semipermeable partition during except water pipe 20, further remove moisture wherein, eliminated the impact of moisture on stratographic analysis, the result that makes it enter the rear detection analysis of the second chromatograph 17 is more accurate.
The above is giving an example of the utility model preferred forms, and the part of wherein not addressing is in detail those of ordinary skills' common practise.Protection domain of the present utility model is as the criterion with the content of claim, and any equivalent transformation carrying out based on technology enlightenment of the present utility model, also within protection domain of the present utility model.
Claims (8)
1. an atmospheric volatile organic compounds sampling analysis device, is characterized in that, comprising:
Environmental chamber at low temperature, described environmental chamber at low temperature is connected with compressor, in described environmental chamber at low temperature, be provided with cryotrap device, described cryotrap device comprises the first cold-trap, the second cold-trap and the 3rd cold-trap, described the first cold-trap comprises the first condenser pipe and the first semiconductor chilling plate group, on described the first condenser pipe, is wound with the first heater strip; Described the second cold-trap comprises the second condenser pipe and the second semiconductor chilling plate group, on described the second condenser pipe, is wound with the second heater strip; Described the 3rd cold-trap comprises the 3rd condenser pipe and the 3rd semiconductor chilling plate group, on described the 3rd condenser pipe, is wound with the 3rd heater strip;
Air sampler, the output terminal of described air sampler is connected to the input end of mass flowmeter, the output terminal of described mass flowmeter is connected to the first end of the first multiport valve, the second end of described the first multiport valve is connected with carrier gas source of the gas, and the 3rd end of described the first multiport valve is connected to the entrance point of described the first condenser pipe;
The endpiece of described the first condenser pipe is connected to the first end of the second multiport valve, and the second end of described the second multiport valve is connected with the entrance point of described the second condenser pipe, and the 3rd end of described the second multiport valve is connected with the entrance point of described the 3rd condenser pipe;
The endpiece of described the second condenser pipe is connected to the first end of the 3rd multiport valve, and the second end of described the 3rd multiport valve is connected with blowback source of the gas, and the 3rd end of described the 3rd multiport valve is connected to the first chromatographic detection input end;
The endpiece of described the 3rd condenser pipe is connected to the first end of the 4th multiport valve, and the first end of described the 4th multiport valve is connected with described blowback source of the gas, and the second end of described the 4th multiport valve is connected to the second chromatographic detection input end.
2. atmospheric volatile organic compounds sampling analysis device as claimed in claim 1, is characterized in that: in described environmental chamber at low temperature, be provided with the first refrigeration cavity, the second refrigeration cavity and the 3rd refrigeration cavity; Described the first condenser pipe and described the first heater strip are arranged in described the first refrigeration cavity, described the second condenser pipe and described the second heater strip are arranged in described the second refrigeration cavity, and described the 3rd condenser pipe and described the 3rd heater strip are arranged in described the 3rd refrigeration cavity.
3. atmospheric volatile organic compounds sampling analysis device as claimed in claim 1, it is characterized in that: between the second end of described the second multiport valve and the entrance point of described the 3rd condenser pipe, be also connected with semipermeable partition except water pipe, described semipermeable partition removes water pipe outer cover and is provided with drying tube.
4. atmospheric volatile organic compounds sampling analysis device as claimed in claim 3, is characterized in that: described semipermeable partition is except being also connected with pressure valve between the endpiece of water pipe and the entrance point of described the 3rd condenser pipe.
5. atmospheric volatile organic compounds sampling analysis device as claimed in claim 1, it is characterized in that: described the first semiconductor chilling plate group comprises the semiconductor chilling plate of two that fit together above and electrical connections in parallel, described the second semiconductor chilling plate group comprises the semiconductor chilling plate of three that fit together above and electrical connections in parallel, and described the 3rd semiconductor chilling plate group comprises the semiconductor chilling plate of two that fit together above and electrical connections in parallel.
6. atmospheric volatile organic compounds sampling analysis device as claimed in claim 2, is characterized in that: the outside of described the first refrigeration cavity, described the second refrigeration cavity and described the 3rd refrigeration cavity is enclosed with respectively heat-insulating material.
7. atmospheric volatile organic compounds sampling analysis device as claimed in claim 1, is characterized in that: described the first condenser pipe, described the second condenser pipe and described the 3rd condenser pipe are stainless steel condenser pipe.
8. the atmospheric volatile organic compounds sampling analysis device as described in claim 1 to 7 any one, is characterized in that: described carrier gas source of the gas and described blowback source of the gas are the inert gas that purity is greater than 99.9%.
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| CN201320571410.2U CN203443939U (en) | 2013-09-12 | 2013-09-12 | Sampling and analyzing device for volatile organic materials in air |
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| CN201320571410.2U CN203443939U (en) | 2013-09-12 | 2013-09-12 | Sampling and analyzing device for volatile organic materials in air |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103499662A (en) * | 2013-09-12 | 2014-01-08 | 苏州威阳环保科技有限公司 | Sampling analysis device and sampling analysis method for atmosphere volatile organic compounds |
| CN106501034A (en) * | 2016-12-20 | 2017-03-15 | 北京光科博冶科技有限责任公司 | A kind of device of the smoke sampling monitoring of high temperature with high dust |
| CN109865309A (en) * | 2017-12-01 | 2019-06-11 | 中国科学院大连化学物理研究所 | A kind of enrichment of volatile organic trace compounds low temperature and Thermal desorption integration cold-trap |
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