CN103852370A - Mobile low-temperature adsorption concentration-thermal desorption device and application method thereof - Google Patents
Mobile low-temperature adsorption concentration-thermal desorption device and application method thereof Download PDFInfo
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- CN103852370A CN103852370A CN201410076717.4A CN201410076717A CN103852370A CN 103852370 A CN103852370 A CN 103852370A CN 201410076717 A CN201410076717 A CN 201410076717A CN 103852370 A CN103852370 A CN 103852370A
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Abstract
The invention discloses a mobile adsorption concentration-thermal desorption device and an application method thereof. The device comprises a control system, a gas circuit part and a mobile cold trap consisting of a heating module, a refrigerating module and a mobile mechanism. The method comprises the steps of control system starting, operation of the refrigerating module, sample collection, operation of the heating module, sample desorption, pipeline cleaning, and the like. The device has the advantages that a refrigerating fin is easy to damage after long-time overheating, and the gas adsorption and gas enrichment efficiency is effectively improved. In comparison with the prior art, the device shortens the adsorption and analysis time, reduces the time consumption, lowers the cost and improves the concentration efficiency.
Description
Technical field
The present invention relates to a kind of atmospheric environment sample pre-treatments equipment, in particular, the present invention relates to a kind of portable Adsorption Concentration-thermal desorption device and using method thereof for atmospheric environment sample pre-treatments equipment.
Background technology
As everyone knows, the industries such as petrochemical complex, pharmacy and rubber manufacture all belong to typical foul gas discharge industry, and odor pollution occupy second in the large public hazards in the world seven.
At present, about 4500 kinds of known foul gas, due to its complicated component, and content only to account for parts per billion even lower, therefore direct-detection is more difficult, need to carry out sample pre-treatments.Existing pre-treatment mode adopts the method for Cold trap condensing-thermal desorption mostly, utilize solid adsorbent in sampling pipe at low temperatures the characteristic of adsorption sample reach the object of enrichment method, then characteristic component retention property to be measured being reduced by adsorbent under high temperature is utilized carrier gas that component to be measured is transported to pertinent instruments to analyze mensuration.
Aforementioned employing Cold trap condensing-thermal desorption carries out the device of pre-treatment, manufactures its low temperature environment greatly mainly with refrigerants such as liquid oxygen, liquid nitrogen or dry ice, and the shortcoming of this mode is length consuming time, and cost is high; Also some pretreating device is to freeze and on sampling pipe, be wound around heater strip with semiconductor chilling plate to produce high temperature, the low-temperature receiver of this mode and thermal source weave in, often the two checks and balance, cannot reach good concentrated effect, if and semiconductor chilling plate also can reduce its life-span for a long time under the condition of high temperature, cause device to damage, maintainability is also poor.
Summary of the invention
Object of the present invention solves the existing problem of above prior art exactly, and the portable Adsorption Concentration-thermal desorption device and the using method thereof that provide a kind of low-temperature receiver to separate with thermal source for this reason, thereby overcome the defect of prior art, the serviceable life of extension device, and improve the concentrated efficiency with resolving.
Technical scheme of the present invention is as follows:
A kind of portable Adsorption Concentration-thermal desorption device, comprises control system and air path part, also comprises mobile cold-trap, and described mobile cold-trap is made up of heating module, refrigeration module and travel mechanism.
Described heating module comprises the heat block that connects temperature controller, is provided with temperature sensor and the heating tank that holds sampling pipe on described heat block, and heating rod is inlayed respectively in the both sides of described heating tank.
Described refrigeration module comprises one-level semiconductor chilling plate and six level semiconductor cooling pieces, and described one-level semiconductor chilling plate is arranged on the bottom of described six level semiconductor cooling pieces and is fixed on the table top of heat-pipe radiator.
Described travel mechanism comprises heating/refrigerating cavity, heating/refrigerating division board, clamp and linear electric motors; Described heating/refrigerating division board is arranged between the heating module and refrigeration module in described heating/refrigerating cavity, heat block in described heating module is fixed on the inner top of described heating/refrigerating cavity, cooling piece in described refrigeration module is fixed on the bottom of described heating/refrigerating cavity, the inwall both sides of described clamp and described heating/refrigerating cavity form moving sets, and described linear electric motors are fixed on the top of described clamp and drive described clamp to drive sampling pipe to move up and down along the inwall both sides of described heating/refrigerating cavity.
In aforementioned techniques scheme:
Described sampling pipe is inner universal sampling pipe of filling adsorbent, and the outer setting of described sampling pipe has heat conduction copper groove; Described heating rod is dry combustion method type heating rod; The model of described temperature sensor is PT100; Described linear electric motors are ball-screw linear electric motors; Described clamp selects polytetrafluoroethylmaterial material to make; In described control system, be provided with six three-way electromagnetic valves and mass rate control meter.
A kind of using method of portable Adsorption Concentration-thermal desorption device, comprises the following steps:
(1) start control system, make described mobile cold-trap in preparation work state;
(2) one-level in the heat block in described heating module and described refrigeration module, six level semiconductor cooling pieces all reach after corresponding temperature-time, open heating/refrigerating division board, control linear electric motors and drive sampling pipe to move on six described level semiconductor cooling pieces;
(3) close heating/refrigerating division board, after treating that sampling pipe reaches uniform temperature, carry out sample collection;
(4) after sampling, open heating/refrigerating division board, control linear electric motors and drive described sampling pipe to move to the bottom of heat block and make it embed the heating tank of described heat block bottom;
(5) close heating/refrigerating division board, after treating that sampling pipe reaches uniform temperature, pass into carrier gas, carry out sample desorption;
(6) after desorption, carry out pipeline-cleaning, complete the pre-treatment work of sample gas.
The present invention compared with prior art, has following beneficial effect:
(1) setting of described mobile cold-trap, effectively isolates low-temperature receiver and thermal source, from solved the problem that cooling piece easily damages in crossing thermal environment for a long time at all;
(2) the isolation setting of described refrigeration module and heating module, avoid checking and balance between low-temperature receiver and thermal source, not only increase refrigerating function, the absorption of gas can be carried out below at-50 ℃, and greatly increased gas absorption and improved the bioaccumulation efficiency of gas;
(3) moving sets that the inwall both sides of the clamp in described mobile cold-trap and heating/refrigerating cavity form, the linear electric motors of being convenient to be fixed on described clamp top drive the round movement of sampling pipe from refrigerating chamber to heating chamber, and make refrigeration module and heating module always in running status, thereby effectively shorten absorption, parsing time, reduce consuming time, reduce costs, improve thickening efficiency.
(4) described sampling pipe adopts in it and fills the universal of different adsorbents, conveniently need to change at any time according to sampling, and applicability is good, easy to operate;
(5) heating function of described heating module is directly born by heat block, without apply reverse voltage by semiconductor chilling plate as prior art, thereby raising heating rate, and the setting of the outside heat conduction copper of described sampling pipe groove also makes heating rate be further enhanced;
(6) in described control system, adopted and can, by control panels such as directly actuated six three-way electromagnetic valves of workstation software and mass rate control meters, be convenient to realize concentration process robotization, and improved precision and stability concentrated, that resolve.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the schematic diagram of mobile cold-trap in refrigerating state in Fig. 1;
Fig. 3 is the schematic diagram of mobile cold-trap in heated condition in Fig. 1;
Fig. 4 is the structural representation of heat block in Fig. 2, Fig. 3.
Mark in figure: 1--source of the gas access port, 2--second is except water filter, 3--the second solenoid valve, 4--the 3rd dust removal filter, 5--the second mass rate control meter, 6--sample gas evacuation port, 7--vacuum pump, 8--the first mass rate control meter, 9--the second dust removal filter, 10--first is except water filter, 11--temperature controller, 12--six-way valve, 13--cleaning gas escape hole, 14--two-bit triplet solenoid valve, 15--desorption gas escape hole, 17--moves cold-trap, 18--the first dust removal filter, 19--the first solenoid valve, 20--sample gas access port, 21--linear electric motors, 22--clamp, 23--heating/refrigerating cavity, 24--heating/refrigerating division board, 25--heat block, 26--sampling pipe, 27--heat conduction copper groove, six grades of cooling pieces of 30--, 31--one-level cooling piece, 32--spring shim screw hole, 33--heating rod, 34--heating tank, 35--temperature sensor.
Embodiment
For the present invention is more easily understood, below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
Fig. 1 is the structural representation of the portable Adsorption Concentration-thermal desorption device of the present invention.
With reference to Fig. 1, portable Adsorption Concentration-thermal desorption device of the present invention, forms by mobile cold-trap 17 and by the connected control system of control line and air path part, and described mobile cold-trap 17 comprises heating module, refrigeration module and travel mechanism;
Fig. 2, Fig. 3 are the schematic diagram in refrigeration and heated condition respectively of mobile cold-trap described in the present invention; Fig. 4 is the structural representation of heat block in Fig. 2, Fig. 3.
With reference to Fig. 2, Fig. 4 and in conjunction with Fig. 1, heating module in described mobile cold-trap 17 comprises heat block 25, described heat block 25 connects the temperature controller 11 of described control system, on described heat block 25, be provided with for the temperature sensor 35 of collecting temperature signal and for holding the heating tank 34 of sampling pipe 26, heating rod 33 is inlayed respectively in the both sides of described heating tank 34;
With reference to Fig. 3, Fig. 4 and in conjunction with Fig. 1, the refrigeration module in described mobile cold-trap 17 comprises one-level semiconductor chilling plate 31 and six level semiconductor cooling pieces 30, also comprises heat-pipe radiator and radiator fan (not shown); Described one-level semiconductor chilling plate has four, they are separately positioned on the bottom of described six level semiconductor cooling pieces and are fixed on the table top of described heat-pipe radiator, and described one-level semiconductor chilling plate 31, six level semiconductor cooling pieces 30 and radiator fan are by control system control;
With reference to Fig. 2, Fig. 3, Fig. 4 and in conjunction with Fig. 1, the travel mechanism in described mobile cold-trap 17 comprises heating/refrigerating cavity 23, heating/refrigerating division board 24, clamp 22 and linear electric motors 21, between the heating module and refrigeration module of described heating/refrigerating division board 24 in described heating/refrigerating cavity 23, heat block 25 in described heating module is fixed on the inner top of described heating/refrigerating cavity 23 by the spring shim screw hole 32 on it, cooling piece in described refrigeration module is fixed on the bottom of described heating/refrigerating cavity 23, described clamp 22 forms moving sets with the inwall both sides of described heating/refrigerating cavity 23, described linear electric motors 21 are fixed on the top of described clamp 22 and drive described clamp 22 to drive described sampling pipe 26 to move up and down in described heating/refrigerating cavity 23.
Control system in the present invention is connected with described heating module, refrigeration module, travel mechanism by operation circuit, and in operation circuit, is provided with the control panels such as 1 six three-way electromagnetic valve, 4 solenoid valves and 2 mass rate control meters.
With reference to Fig. 1, the air path part in the present invention comprises sampling gas circuit, desorption gas circuit and cleans gas circuit;
Described sampling gas circuit by pipeline by the be linked in sequence a mouth of the first solenoid valve 19, the first dust removal filter 18 and six-way valve 12 of sample gas access port 20, again by the f mouth of described six-way valve 12 be linked in sequence sampling pipe 26 in described mobile cold-trap 17 and the c mouth of described six-way valve 12, then be linked in sequence first except water filter 10, the second dust removal filter 9, the first mass rate control meter 8, vacuum pump 7 and sample gas escape hole 6 by the b mouth of described six-way valve 12;
Described desorption gas circuit by pipeline by the source of the gas access port 1 second d mouth except water filter 2, the second solenoid valve 3, the 3rd dust removal filter 4, the second mass rate control meter 5 and described six-way valve 12 that is linked in sequence, then by the c mouth of described six-way valve 12 be linked in sequence sampling pipe 26 in described mobile cold-trap 17 and the f mouth of described six-way valve 12, then by the e mouth of described six-way valve 12 be linked in sequence two-bit triplet solenoid valve 14 and desorption gas escape hole 15;
Described cleaning gas circuit by pipeline by the source of the gas access port 1 second d mouth except water filter 2, the second solenoid valve 3, the 3rd dust removal filter 4, the second mass rate control meter 5 and described six-way valve 12 that is linked in sequence, then by the c mouth of described six-way valve 12 be linked in sequence sampling pipe 26 in described mobile cold-trap 17 and the f mouth of described six-way valve 12, then by the e mouth of described six-way valve 12 be linked in sequence two-bit triplet solenoid valve 14 and cleaning gas escape hole 13.
For the convenience that arranges and obtain best cost performance, in above technical scheme, described linear electric motors 22 adopt ball-screw linear electric motors, the material selection teflon of described clamp 22, the interior filling adsorbent of described sampling pipe 26 and its outer setting heat conduction copper groove 27, described heating rod 33 is dry combustion method type heating rod, and the model of described temperature sensor 35 is PT100.
To cause the 0.2ppm sulfuretted hydrogen of environmental pollution as concentrated target substance, the using method of the portable Adsorption Concentration-thermal desorption device of the present invention is described below:
(1) start control system, make heating module in described mobile cold-trap 17, refrigeration module, travel mechanism all in preparation work state;
(2) the one-level semiconductor chilling plate 31 in heat block 25 and described refrigeration module in described heating module and six level semiconductor cooling pieces 30 all reach after corresponding temperature-time, open described heating/refrigerating division board 24, control described linear electric motors 21 and move down and drive described sampling pipe 26 to move on described six level semiconductor cooling pieces 30 along described clamp 22;
(3) close described heating/refrigerating division board 24, carry out sample collection, make sample gas be arrived a mouth of six-way valve 12 by the first solenoid valve 19, the first dust removal filter 18 by described sample gas access port 20 orders along pipeline, f mouth by described six-way valve 12 arrives the sampling pipe 26 in described mobile cold-trap 17 and enters the c mouth of described six-way valve 12 again, then b mouth order by described six-way valve 12 by first except water filter 10, the second dust removal filter 9, the first mass rate control meter 8, the vacuum pump 7 sample gas escape hole 6 described in arriving;
(4) after waiting to sample, open described heating/refrigerating division board 24, control described linear electric motors 21 and make it embed described heating tank 34 along moving on described clamp 22 and driving described sampling pipe 26 to move to described heat block 25 bottoms;
(5) close described heating/refrigerating division board 24, carry out sample desorption, make nitrogen remove water filter 2 by source of the gas access port 1 order by second along pipeline, the second solenoid valve 3, the 3rd dust removal filter 4, the second mass rate control meter 5 arrives the d mouth of described six-way valve 12, arrived again the f mouth of described six-way valve 12 by described sampling pipe 26 by the c mouth of described six-way valve 12, then entering concentration rate by the e mouth order of described six-way valve 12 by two-bit triplet solenoid valve 14 and desorption gas escape hole 15 is the analytical instrument desorption of 50 times, make more than concentration of hydrogen sulfide in sample gas reaches 10ppm,
(6) after treating desorption, carry out pipeline-cleaning, nitrogen arrives the d mouth of described six-way valve 12 by second except water filter 2, the second solenoid valve 3, the 3rd dust removal filter 4, the second mass rate control meter 5 by source of the gas access port 1 order along pipeline, arrived again the f mouth of described six-way valve 12 by described sampling pipe 26 by the c mouth order of described six-way valve 12, pass through the 3rd solenoid valve 14 and cleaning gas escape hole 13 by the e mouth order of described six-way valve 12 again, enter in atmosphere, complete the pre-treatment work of sample gas.
Utilize portable Adsorption Concentration-thermal desorption device of the present invention to carry out the pre-treatment work of atmospheric environment sample, can guarantee that low-temperature receiver and thermal source do not interfere with each other in Adsorption Concentration and hot resolving, for Practical significance serviceable life with significant that improves concentrated and analyzing efficiency, extends part.
With reference to drawings and Examples, technical scheme of the present invention is schematically described above, this description does not have restricted.Those of ordinary skill in the art will be understood that in actual applications, and in apparatus of the present invention, the set-up mode of each parts some all may occur changes, and other staff also may dream up similar technical scheme under its enlightenment.Special needs to be pointed out is, only otherwise depart from design aim of the present invention, all apparent changes, within being all included in protection scope of the present invention.
Claims (8)
1. portable Adsorption Concentration-thermal desorption device, comprises control system and air path part, it is characterized in that: it also comprises the mobile cold-trap being made up of heating module, refrigeration module and travel mechanism.
2. portable Adsorption Concentration-thermal desorption device according to claim 1, it is characterized in that: described heating module comprises the heat block that connects temperature controller, on described heat block, be provided with temperature sensor and the heating tank that holds sampling pipe, heating rod is inlayed respectively in the both sides of described heating tank.
3. portable Adsorption Concentration-thermal desorption device according to claim 1, it is characterized in that: described refrigeration module comprises one-level semiconductor chilling plate and six level semiconductor cooling pieces, and described one-level semiconductor chilling plate is arranged on the bottom of described six level semiconductor cooling pieces and is fixed on the table top of heat-pipe radiator.
4. portable Adsorption Concentration-thermal desorption device according to claim 1, is characterized in that: described travel mechanism comprises heating/refrigerating cavity, heating/refrigerating division board, clamp and linear electric motors; Described heating/refrigerating division board is arranged between the heating module and refrigeration module in described heating/refrigerating cavity, heat block in described heating module is fixed on the inner top of described heating/refrigerating cavity, cooling piece in described refrigeration module is fixed on the bottom of described heating/refrigerating cavity, the inwall both sides of described clamp and described heating/refrigerating cavity form moving sets, and described linear electric motors are fixed on the top of described clamp and drive described clamp to drive sampling pipe to move up and down along the inwall both sides of described heating/refrigerating cavity.
5. portable Adsorption Concentration-thermal desorption device according to claim 2, is characterized in that: described sampling pipe is inner universal sampling pipe of filling adsorbent, and the outer setting of described sampling pipe has heat conduction copper groove; Described heating rod is dry combustion method type heating rod; The model of described temperature sensor is PT100.
6. portable Adsorption Concentration-thermal desorption device according to claim 4, is characterized in that: described linear electric motors are ball-screw linear electric motors; Described clamp selects polytetrafluoroethylmaterial material to make.
7. portable Adsorption Concentration-thermal desorption device according to claim 1, is characterized in that: in described control system, be provided with six three-way electromagnetic valves and mass rate control meter.
8. a using method for portable Adsorption Concentration-thermal desorption device as claimed in claim 1, is characterized in that: the method comprises the following steps:
(1) start control system, make described mobile cold-trap in preparation work state;
(2) one-level in the heat block in described heating module and described refrigeration module, six level semiconductor cooling pieces all reach after corresponding temperature-time, open heating/refrigerating division board, control linear electric motors and drive sampling pipe to move on six described level semiconductor cooling pieces;
(3) close heating/refrigerating division board, after treating that sampling pipe reaches uniform temperature, carry out sample collection;
(4) after sampling, open heating/refrigerating division board, control linear electric motors and drive described sampling pipe to move to the bottom of heat block and make it embed the heating tank of described heat block bottom;
(5) close heating/refrigerating division board, after treating that sampling pipe reaches uniform temperature, pass into carrier gas, carry out sample desorption;
(6) after desorption, carry out pipeline-cleaning, complete the pre-treatment work of sample gas.
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Application publication date: 20140611 |