CN104707448A - Gas dewatering device and using method thereof - Google Patents
Gas dewatering device and using method thereof Download PDFInfo
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- CN104707448A CN104707448A CN201310694206.4A CN201310694206A CN104707448A CN 104707448 A CN104707448 A CN 104707448A CN 201310694206 A CN201310694206 A CN 201310694206A CN 104707448 A CN104707448 A CN 104707448A
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- dehydrating tube
- dewatering
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Abstract
The invention discloses a gas dewatering device and a using method thereof, the gas dewatering device includes a main body and a Nafion dewatering tube, a dewatering chamber is arranged in the main body, the Nafion dewatering tube is arranged in the dewatering chamber, a to-be-tested sample gas flows in the Nafion dewatering tube, and dehydration in the dewatering chamber can be realized by fan blowing and molecular sieve water absorption or one or a plurality of circulating and dry mixed gas. In the method, by use of the water permeability of the Nafion dewatering tube and the humidity difference between the two sides of the Nafion dewatering tube, the diffusion and fast absorption of water can be realized. Finally, the gas humidity inside the Nafion dewatering tube can be reduced to meet the testing needs of an analysis instrument. The method has the advantages of low cost, high water vapor removing performance, fast water vapor removing speed, small device volume and the like. The gas dewatering device can be used as a simple, rapid and reliable pretreatment technology for various gas analyzers.
Description
Technical field
The invention discloses a kind of dewater unit, specifically a kind of gas dewatering device and using method thereof.
Background technology
In clinical analysis gas test, patient gas's body is 37 DEG C of steam-laden humid gas, and its saturated vapor pressure is 47mmHg(6.3kPa).Because water vapour red line absorption band and CO2 and anesthetic gases partly overlap, can interference measurement also can pollution detection room, have a strong impact on measured value.Simultaneously due to the existence of steam in gas, some other analytical instrument testing result in analysis detects also can be caused inaccurate, and serious meeting affects detection and carries out.Therefore, the pre-treatment of dewatering must be done before analytical instrument analysis detects.
The water-eliminating method of current acquisition testing has had multiple, and the such as water-eliminating method of main flow acquisition testing is the impact adopting the method for sensor 38 DEG C of constant temperature to reduce steam.Principle be gas carry the ability of moisture and temperature proportional; The water removal phase that by-pass flow gas production monitor adopts is: the tidal air cognition that (1) enters air collecting pipe is down to room temperature gradually, and along with temperature reduces, the deposit of moisture that the water vapour condensation in breathing gas discharges is in air collecting pipe tube wall and water accumulating cup.(2) in water accumulator, hydrone in hydrophobic filter film barrier gas is provided with and particulate matter passes through.(3) entered the Nafion dehydrating tube connected in monitor by the gas of filter membrane, its pipe wall material has hydrophily, can, in gastight situation, allow the moisture in gas to penetrate into the outer evaporation of pipe by tube wall.Detection gas humidity after above process is very low.(4) detector constant temperature is to about 38 DEG C, and because gas temperature rises again, water capacity strengthens, and the humidity of detection gas is more reduced.
Nafion is a kind of excellent cation-exchanger be made up of perfluorinated sulfonic acid ester.In the inside of Nafion, the end of the chain on the farmland (being namely similar to the fluorine carbon skeleton farmland of polytetrafluoroethylene (PTFE) and hydrophilic farmland) of moisture hydrophobicity is hydrophilic ionization sulfonic group, due to an ion exchange is sulfonic group, so it has well selective to cation, especially large to those, the cation of hydrophobicity has well selective.Nafion dehydrating tube has different diameters, constantly can optimize the performance of Nafion transfer water.Water is permeated by Nafion membranous wall, and evaporation subsequently enters in the surrounding air of surrounding, realizes " pervaporation ".Moist gradient inside and outside pipe drives whole process.
In Nafion dehydrating tube, ion channel extends to outer surface by the inner surface of pipe.The sulfonic group group of hydrone first on inner surface is combined, the hydrone that the sulfonic group of tube wall depths combines is less, therefore stronger attraction is had to hydrone, the hydrone of pipe internal surface will pass through sulfonic group very soon, arrive the outer surface of tube wall, be dispersed in environment, realize to wet sample go molten.The dried sweep gas (normally air) of the moisture of being discharged by Nafion dehydrating tube takes system out of, then the inside and outside barometric gradient existed of tube wall can ensure that molten process lasts carries out.
Summary of the invention
A kind of gas dewatering device, is characterized in that: comprise main body and dehydrating tube, arranges dewatering cavity in described main body, a side end face of main body is arranged sample gas inlet and the outlet of clean gas, opposite side end face is arranged sample gas outlet and clean gas entrance; Arrange dehydrating tube in described dewatering cavity, the air inlet of dehydrating tube is connected with the sample gas inlet in main body, and the gas outlet of dehydrating tube is connected with the sample gas outlet in main body; The external analysis detector in gas outlet of described dehydrating tube; Described clean gas entrance is connected with purification source of the gas, and clean gas outlet sky connects.
Preferably, in described gas dewatering device, arrange winding cylinder in described dewatering cavity, dehydrating tube is wrapped on winding cylinder; Described winding cylinder inner hollow, outer setting has helical groove; Described dehydrating tube is embedded in helical groove, and dehydrating tube two ends are connected with hydraulic quick coupler respectively, and winding cylinder and dewatering cavity wall are fixed together.
Preferably, in described gas dewatering device, described dehydrating tube is Nafion dehydrating tube.
Preferably, in described gas dewatering device, described winding cylinder is made by the one in tetrafluoro, stainless steel, PVC or pik material.
A using method for gas dewatering device, comprises the following steps:
A. dehydrating tube end connects aspiration pump, or dehydrating tube front end connects carrier gas transfer pipeline;
B. carry sample gas by aspiration pump draws sample gas or carrier gas, enter dehydrating tube through sample inlet, sample gas flows out through the sample gas outlet of the dehydrating tube other end, and effluent air is as sample gas to be analyzed;
C. in dewatering cavity, dehydrating tube dry tack free device is set, in order to take away the steam of dehydrating tube diffusion into the surface;
D. carried to send into analyze in detector by carrier gas by the sample gas after above-mentioned process and carry out detection analysis, analyzing detector is gas phase analysis detector, is the one in ion mobility spectrometry, mass spectrum or gas-chromatography.
Preferably, in the using method of described gas dewatering device, described dehydrating tube dry tack free device is the fan being connected to the outlet of clean gas and clean fresh-air intake, under fan effect, enter from clean fresh-air intake and discharge pure air from clean gas outlet, described pure air is sweep gas, and fan is in order to accelerate the circulation of sweep gas in dewatering cavity.
Preferably, in the using method of described gas dewatering device, described dehydrating tube dry tack free device is molecular sieve.
Preferably, in the using method of described gas dewatering device, described sample gas gas flow rate in Nafion dehydrating tube is 50-1000ml/min, and temperature is between 25-65 DEG C.
Preferably, in the using method of described gas dewatering device, the circulating direction of described sweep gas is contrary with the circulating direction of sample gas.
Preferably, in the using method of described gas dewatering device, described purge gas flow velocity 1-3L/min, composition is nitrogen, one or more mixture in oxygen or rare gas, and purge gas temperature is between 25-65 DEG C.
Advantage of the present invention is as follows:
Dewater unit in the present invention can be used for hospital patient gas, atmosphere environment supervision, the online industry such as Pollution Source Monitoring, various gas analyses as analytical instrument dehydration pre-treating method.Because its cost is low, moisture removal property is good, and volume is little, dewaters rapidly, and the feature such as can increase the service life, for analytical instrument gaseous sample dehydration in future provides important pre-treatment means.Particularly with ion mobility spectrometry coupling, popularizing migration spectral technology provides very important pre-treatment measure in clinical application.
Accompanying drawing explanation
Fig. 1 is gas dewatering device internal structure schematic diagram of the present invention;
Fig. 2 is the background signal Ion transfer spectrogram that ion mobility spectrometry detects Nafion dehydrating tube;
Fig. 3 is that ion mobility spectrometry detects the Ion transfer spectrogram being greater than the humid air background signal of 90%;
Fig. 4 is that ion mobility spectrometry detects the Ion transfer spectrogram of humid air after Nafion pipe vapor-removing being greater than 90%;
Fig. 5 is that ion mobility spectrometry detection is greater than the humid air of 90%, includes the Ion transfer spectrogram of 50ppb nitric oxide (NO);
Fig. 6 be ion mobility spectrometry detect be greater than 90% humid air, include the Ion transfer spectrogram of 50ppb nitric oxide (NO) after Nafion pipe vapor-removing.
Wherein: 1, sample gas inlet, 2, sample gas outlet, 3, clean gas entrance, 4, the outlet of clean gas, 5, dehydrating tube inlet end hydraulic quick coupler, 6, dehydrating tube outlet side hydraulic quick coupler, 7, winding cylinder, 8, dehydrating tube, 9, dewatering cavity.
Detailed description of the invention
Embodiment 1
A kind of gas dewatering device in the present invention, comprises main body and Nafion dehydrating tube, arranges dewatering cavity 9 in main body, a side end face of main body is arranged sample gas inlet 1 and clean gas outlet 4, opposite side end face is arranged sample gas outlet 2 and clean gas entrance 3; Nafion dehydrating tube is set in dewatering cavity 9, the air inlet of Nafion dehydrating tube is connected by dehydrating tube inlet end hydraulic quick coupler 5 with the sample gas inlet 1 in main body, and the gas outlet of Nafion dehydrating tube is connected by dehydrating tube outlet side hydraulic quick coupler 6 with the sample gas outlet 2 in main body; The external analysis detector in gas outlet of Nafion dehydrating tube; Clean gas entrance 3 is connected with purification source of the gas, and clean gas exports 4 skies and connects; Arrange winding cylinder 7, Nafion dehydrating tube in dewatering cavity 9 to be wrapped on winding cylinder 7.
Gas dewatering device and using method thereof, comprise the following steps:
A. first extract sample gas through dehydrating tube inlet end hydraulic quick coupler 5 by aspiration pump, send into Nafion dehydrating tube, after Nafion dehydrating tube, the steam in sample gas is diffused into Nafion dehydrating tube outer surface.Flow out through Nafion dehydrating tube other end dehydrating tube outlet side hydraulic quick coupler 6, effluent air is the sample gas through dehumidifying to be checked.
B. secondly by entering from clean gas entrance 3, the steam of Nafion dehydrating tube diffusion into the surface is taken away rapidly from the sweep gas of clean gas outlet 4 outflow.Circulation source gas is flowed into by clean gas entrance 3, and clean gas outlet 4 is discharged.By accelerating the wet water-vapor exchange between surrounding environment, in dewatering cavity 9, realize Nafion dehydrating tube fast dewatering.
C. the gas humidity finally realized inside Nafion dehydrating tube of the sample gas after above-mentioned process drops to and meets analytical instrument detection demand.Can be carried to send into analyze in detector by carrier gas and carry out detection analysis.
Dehydrating tube in the present embodiment selects U.S. Bo Chun company ME110-12BB model Nafion dehydrating tube.
As Fig. 1, select to be greater than 90% in 25 DEG C of environment, relative humidity, the humid air of 200ml/min, dehydrating tube inlet end hydraulic quick coupler 5 through sample gas inlet 1 place enters Nafion dehydrating tube, by flowing out through the outlet side hydraulic quick coupler 6 at sample gas outlet 2 place after Nafion dehydrating tube.After sample passes into 5min, its relative humidity drops to 15%.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1, and filling molecular sieve in dewatering cavity 9 inside replaces sweep gas to take away rapidly the steam of Nafion dehydrating tube diffusion into the surface.
Under 25 DEG C of conditions, the humid air that the relative humidity of 200ml/min is greater than 90%, is dewatered by Nafion dehydrating tube, with loading molecular sieve in dewatering cavity 9 body of peripheral whole Nafion dehydrating tube outsourcing.Learnt by the analysis of Ion transfer spectrometer, the relative humidity of sample gas maintains between 20-30%.Background signal as shown in Figure 2.
Embodiment 3
As seen in figures 3-6, for using the comparison diagram of moisture in sample after product of the present invention, wherein, ion mobility spectrometry is without interpolation dopant, RIP is at 7.5ms, migration tube temperature (40 DEG C), the standby 10S of instrument parameter, sampling 5S, sample introduction 5S, nitric oxide (NO) signal transit time is at about 6.8ms.Fig. 3 is that ion mobility spectrometry detects the Ion transfer spectrogram being greater than the humid air background signal of 90%; There is interfering signal NO signal peak position.Fig. 4 is that ion mobility spectrometry detects the Ion transfer spectrogram of humid air after Nafion pipe vapor-removing being greater than 90%; Effect on moisture extraction clearly, at NO signal location also not interference.Fig. 5 is that ion mobility spectrometry detection is greater than the humid air of 90%, includes the Ion transfer spectrogram of 50ppb NO; Signal before RIP is difficult to determine whether as NO always.Simultaneously Fig. 6 be ion mobility spectrometry detect be greater than 90% humid air, include 50ppbNO, the Ion transfer spectrogram after Nafion dehydrating tube vapor-removing; Humid air carry 50ppb-NO cross Nafion dehydrating tube after detection signal, significantly see the detection of NO.Real-Time Monitoring signal strength signal intensity is about 200mv.Prove that the humidity after the process of Nafion dehydrating tube meets the monitoring of ion mobility spectrometry to NO, have detecting signal.By Fig. 3 and Fig. 4, and the contrast of Fig. 5 and Fig. 6 is known, and after gas dewatering device of the present invention, the moisture in sample obviously reduces.
Claims (10)
1. a gas dewatering device, it is characterized in that: comprise main body and dehydrating tube (8), dewatering cavity (9) is set in described main body, one side end face of main body is arranged sample gas inlet (1) and clean gas outlet (4), opposite side end face is arranged sample gas outlet (2) and clean gas entrance (3); Arrange dehydrating tube (8) in described dewatering cavity (9), the air inlet of dehydrating tube (8) is connected with the sample gas inlet (1) in main body, and the gas outlet of dehydrating tube (8) is connected with the sample gas outlet (2) in main body; The external analysis detector in gas outlet of described dehydrating tube (8); Described clean gas entrance (3) is connected with purification source of the gas, and clean gas outlet (4) sky connects.
2. gas dewatering device according to claim 1, is characterized in that: arrange winding cylinder (7) in described dewatering cavity (9), and dehydrating tube (8) is wrapped on winding cylinder (7); Described winding cylinder (7) inner hollow, outer setting has helical groove; Described dehydrating tube (8) is embedded in helical groove, and dehydrating tube (8) two ends are connected with hydraulic quick coupler respectively, and winding cylinder (7) and dewatering cavity (9) wall are fixed together.
3. gas dewatering device according to claim 1, is characterized in that: described dehydrating tube (8) is Nafion dehydrating tube.
4. gas dewatering device according to claim 2 and using method thereof, is characterized in that: described winding cylinder (7) is made by the one in tetrafluoro, stainless steel, PVC or pik material.
5. a using method for the gas dewatering device according to any one of claim 1-4, is characterized in that: comprise the following steps:
A. dehydrating tube (8) end connects aspiration pump, or dehydrating tube (8) front end connects carrier gas transfer pipeline;
B. carry sample gas by aspiration pump draws sample gas or carrier gas, enter dehydrating tube (8) through sample inlet (1), sample gas flows out through the sample gas outlet (2) of dehydrating tube (8) other end, and effluent air is as sample gas to be analyzed;
C. in dewatering cavity (9), dehydrating tube (8) dry tack free device is set, in order to take away the steam of dehydrating tube (8) diffusion into the surface;
D. carried to send into analyze in detector by carrier gas by the sample gas after above-mentioned process and carry out detection analysis, analyzing detector is gas phase analysis detector, is the one in ion mobility spectrometry, mass spectrum or gas-chromatography.
6. the using method of gas dewatering device according to claim 5, it is characterized in that: described dehydrating tube (8) dry tack free device is for being connected to the fan of clean gas outlet (4) and clean fresh-air intake (3), under fan effect, enter from clean fresh-air intake (3) and discharge pure air from clean gas outlet (4), described pure air is sweep gas, and fan is in order to accelerate the circulation of dewatering cavity (9) interior sweep gas.
7. the using method of gas dewatering device according to claim 5, is characterized in that: described dehydrating tube (8) dry tack free device is molecular sieve.
8. the using method of gas dewatering device according to claim 5, is characterized in that: sample gas gas flow rate in Nafion dehydrating tube (8) is 50-1000ml/min, and temperature is between 25-65 DEG C.
9. the using method of gas dewatering device according to claim 6, is characterized in that: the circulating direction of described sweep gas is contrary with the circulating direction of sample gas.
10. the using method of gas dewatering device according to claim 6, it is characterized in that: purge gas flow velocity 1-3L/min, composition is nitrogen, one or more mixture in oxygen or rare gas, and purge gas temperature is between 25-65 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310694206.4A CN104707448A (en) | 2013-12-15 | 2013-12-15 | Gas dewatering device and using method thereof |
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| CN201310694206.4A CN104707448A (en) | 2013-12-15 | 2013-12-15 | Gas dewatering device and using method thereof |
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| CN104707448A true CN104707448A (en) | 2015-06-17 |
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| CN109069786A (en) * | 2016-05-04 | 2018-12-21 | 马林克罗特医疗产品知识产权公司 | The device and method of humidity regulation sample gas for patient respiratory circuit related with ventilator and/or carbon monoxide transportation system |
| CN112098501A (en) * | 2020-09-15 | 2020-12-18 | 中国科学院合肥物质科学研究院 | nafion-FAIMS detection device and method for on-site detection of high-toxicity VOCs mixture |
| CN112649493A (en) * | 2020-12-15 | 2021-04-13 | 中国科学院大连化学物理研究所 | Device and method for simultaneously detecting ammonia gas and nitric oxide in exhaled breath |
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| CN112098501A (en) * | 2020-09-15 | 2020-12-18 | 中国科学院合肥物质科学研究院 | nafion-FAIMS detection device and method for on-site detection of high-toxicity VOCs mixture |
| CN112098501B (en) * | 2020-09-15 | 2023-12-05 | 中国科学院合肥物质科学研究院 | nafion-FAIMS detection device and method for field detection of high-toxicity VOCs mixture |
| CN112649493A (en) * | 2020-12-15 | 2021-04-13 | 中国科学院大连化学物理研究所 | Device and method for simultaneously detecting ammonia gas and nitric oxide in exhaled breath |
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