CN101524617A - Method for removing moisture in gases by a Nafion tube - Google Patents
Method for removing moisture in gases by a Nafion tube Download PDFInfo
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- CN101524617A CN101524617A CN200910097307A CN200910097307A CN101524617A CN 101524617 A CN101524617 A CN 101524617A CN 200910097307 A CN200910097307 A CN 200910097307A CN 200910097307 A CN200910097307 A CN 200910097307A CN 101524617 A CN101524617 A CN 101524617A
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Abstract
The invention discloses a gas drying method, in particular to a method for removing moisture in gases by a Nafion tube. The method is characterized in that the moisture is absorbed by adopting the permeability of the Nafion tube on the moisture and flow velocity of different gases on both sides of the Nafion tube to finally realize the aim of removing the moisture in processed gases inside the Nafion tube. The method has the advantages of low cost, high moisture removal property, small volume and the like. The method can be applied to such industries as atmospheric environment monitoring, pollution resource on-line monitoring, various gases analysis and rapid emergency command vehicles, etc.
Description
Technical field
The present invention relates to a kind of gas drying means, specifically be meant a kind of method of removing moisture content in the gas with the Nafion pipe.
Background technology
The gas sampling system is the parts of most critical in stationary source smoke on-line monitoring system, atmosphere environment supervision system, the gas analyzer.Processing gas contains moisture content and can cause analyzing the inaccurate of data even cause analytical instrument mortality to damage.As: in the infrared analysis field, it is inaccurate that the moisture content in the processing gas can disturb the infrared analysis result to cause analyzing data.In analyzing water-soluble, corrosive gas, moisture content can make analytical instrument be corroded to cause analytical instrument mortality to damage.
Gas sampling both domestic and external system is to the main methods such as electronic cooling, compressor cooling, drier that adopt in the processing procedure of handling gas.Electronic cooling and compression mechanism cold process all are to use reduction processing gas dew-point temperature to make it reach the purpose of handling air dry.The in use common problem of electronic cooling and compression mechanism cold process is: 1, pipeline and instrument are silted up by water or particulate; 2, the loss of water-soluble analytes; 3, analyzer is corroded by acid mist; 4, can cause pipeline blockage because freeze in order to reach the desirable too low dew-point temperature of water removal effect.Drier dewaters and can't be used for corrosive gas analysis and often maintenance of needs.
Along with the pay attention to day by day of country to environmental protection work, the precision of all gases analysis improves constantly, and the requirement of gas sampling system is also being improved constantly.The dewater problem brought of electronic cooling or compression mechanism cold process will influence the development that China's gas detects industry.
Summary of the invention
The present invention is directed to deficiency of the prior art, propose a kind of easy to operate, respond well drying means.
The present invention is achieved by following technical proposals:
Method with moisture content in the Nafion pipe removal gas is characterized in that comprising the steps:
(1), in gas sampler, is heated to 100 ~ 200 ℃ handling gas by heater block by gas sampler collection and treatment gas;
(2) the processing gas that has heated is filtered through millipore filter again;
(3) through the processing gas of millipore filter, by air pump it is sent into the drier of being made up of the Nafion pipe, handling gas is 0.9 ~ 3 liter/minute at the inboard flow velocity of Nafion pipe; Simultaneously, blow in the dry gas that the Nafion pipe outside has the instrument air generator to produce, its flow velocity is 3 ~ 5 times that Nafion manages inboard flow of process air speed;
(4) the processing gas that blows out in the Nafion pipe is gas dry.
As preferably, above-mentionedly remove the method for moisture content in the gas with the Nafion pipe, in the gas sampler, be 110 ~ 120 ℃ in the step (1) to the temperature of handling the gas heating.
As preferably; above-mentioned method with moisture content in the Nafion pipe removal gas; millipore filter in the step (2) is that the millipore filter two-stage series connection of 1 ~ 5um millipore filter and 0.1 ~ 0.2um filters; can remove the solid impurity handled in the gas etc. better, protect the long-term use of equipment better.
As preferably, above-mentioned remove the method for moisture content in the gas with the Nafion pipe, handling gas in the step (3) is 1 liter/minute at the inboard flow velocity of Nafion pipe, the temperature that enters the processing gas of Nafion pipe is 90 ~ 100 ℃.
As preferably, the above-mentioned method of removing moisture content in the gas with the Nafion pipe, the dry gas that step (3) is produced by the instrument air generator, be that compressed air is entered filter after by the oil water separator oil removing, through electronic refrigerator air themperature is reduced to below 4 ℃, further dry through heatless regeneration formula mole sieve drier again air, be dry gas until the air that reaches-70 ℃ dew point.
As preferably, above-mentionedly remove the method for moisture content in the gas with the Nafion pipe, to blow over the flow velocity in the Nafion pipe outside be 4 times that Nafion manages inboard flow of process air speed to dry gas in the step (3).
As preferably, above-mentionedly remove the method for moisture content in the gas with the Nafion pipe, the flow direction that dry gas is blown over the Nafion pipe outside in the step (3) is opposite with the direction that flow of process air is crossed Nafion pipe inboard.
The technical scheme that Nafion divides proton exchange to dewater is to be fixed into cellularly according to the effective fluorubber of Nafion that the flow of process air amount is produced many Du Pont companies, and it is encapsulated in the stainless steel 316L pipe.Two ends are with having the stainless steel cover sealing of handling gas import and instrument wind inlet.After processing gas entered the Nafion pipe from import, because the Nafion pipe contains sulfonic acid group, Nafion had extremely strong seepage of water.By sulfonic acid group, on the Nafion tube wall, formed a crosslinked ion channel, water promptly is transferred to the another side of tube wall, evaporation then by ion channel after tube wall surface absorbs through sulfonic group.Dry instrument wind is taken away steam endlessly by the instrument wind inlet, reaches to handle the gas dry purpose that dewaters.This pipe only plays suction-operated to hydroxyl, and a sulfonic acid group can be accepted 13 hydrones.Therefore under the purging of the instrument wind of certain aridity, the gas dew point temperature can be reduced to-27 ℃--40 ℃.Because Nafion is polytetrafluoroethylene (PTFE) and fluoro-3, the copolymer of 6-diepoxy-4-methyl-7-decene-sulfuric acid has extremely strong chemical resistance of concrete characteristic, so can be used for the occasion of highly acid gas.
The processing gas that air pump is collected is by the bigger particle of volume in the thicker filter filtration treatment gas, again by volume smaller particles thing in the thinner filter filtration treatment gas, in order to avoid influence the moisture removal property of Nafion pipe.Processing gas after filtering is heated to 90 ~ 100 ℃, enters the Nafion pipe with certain flow velocity.The Nafion tube-surface is swept in the instrument wind of the drying that produces with the instrument air generator, takes away steam.The instrument air generator provides and purges the dry instrument wind of Nafion pipe, makes in the Nafion pipe, outer to form the aqueous vapor partial pressure gradient poor for pipe, reaches the Nafion pipe continuously to the purpose of the outer conveying of pipe moisture content.The instrument air generator adopts the mole sieve drier of heatless regeneration formula, and the mole sieve drier technology of heatless regeneration formula is very ripe, cheap at home at present, can reach-70 ℃ of dew points, but needs often to safeguard.In order to reduce maintenance, with air filtering dust-removing, oil removing dewaters before instrument air generator inlet.In instrument air generator outlet carrying out again fine filtering dedusting.Substantially can reach the 3-4 Maintenance free.
In the Nation pipe, ion channel extends to outer surface by the inner surface of pipe.Hydrone at first combines with sulfonic group on the inner surface, the hydrone of the sulfonic group combination of tube wall depths less (supposing that the pressure of outer surface water vapour is lower than the pressure of inner surface water vapour), therefore hydrone there is stronger attraction, the hydrone of pipe internal surface will pass through sulfonic group very soon, arrive the outer surface of tube wall, be dispersed in the environment, realize to wet sample aerocolloidal go molten.The sweep gas (normally air) that the moisture of being discharged by the Nafion pipe is dried is taken system out of, and then the inside and outside barometric gradient that exists of tube wall can guarantee that molten process continues to carry out.
In the formula: V
PBe the dry gas flow velocity;
V
SBe flow of process air speed;
P
SFor handling atmospheric pressure;
P
VBe dry gas pressure.
Instrument air generator generation per minute 3 ~ 5L, dew point are that-70 ℃ dry gas purges Nafion pipe outer tube wall, make the inside and outside barometric gradient that exists of tube wall, and the aqueous vapor that evaporates is taken away.Instrument wind enters from the instrument wind inlet of Nafion pipe, purges Nafion pipe outer tube wall with stable flow velocity, enters the atmosphere from the outlet of instrument wind again.
Beneficial effect: the present invention can be used for atmosphere environment supervision, in line source monitoring, all gases analysis, industry such as Emergency Command Vehicle fast.The gas sampling system of alternative external costliness is used for CEMS, satisfies the standard of GB/T76 fully.Because characteristics such as its cost is low, and moisture removal property is good, and volume is little, increase the service life are for technical development, the localization process of industries such as gas analysis in future, environmental protection have been accelerated speed.
Figure of description
Fig. 1 removes the schematic flow sheet of moisture content in the gas with the Nafion pipe
Fig. 2 drier generalized section
1, gas sampler 2,1 ~ 5um millipore filter 3,0.1 ~ 0.2um millipore filter 4, air pump 5, drier 6, instrument air generator 7, heater block 8, Nafion pipe 9, handle gas outlet 10, dry gas inlet 11, dry gas outlet 12, handle the gas inlet
The specific embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is specified:
Embodiment
Test the structure of drier shown in structure and the accompanying drawing 2 as shown in Figure 1, experimental system is made up of humidifier, gas sampler 1, air pump 4, instrument air generator 6, air compressor, Nafion pipe 8, filter, dew point hygrometer.Workflow is: the temperature around humidifier is measured gas sampler 1 ambient air humidification, entering gas sampler 1 is heated by the heater block 7 in the gas sampler 1, measurement gas sampler 1 outlet dew-point temperature, and filter through 5um millipore filter 2 and 0.2um millipore filter 3, by air pump 4 the sample body is input to again and measures and place restrictions on flow in the flowmeter.Heat handling gas again, make it keep the temperature of sampler.Handling gas at last enters by Nafion pipe 8 driers of forming 5.Air compressor is produced the air of 16L/min by instrument air generator 6,6 outlets of instrument air generator connect flowmeter the instrument supply gas flow are measured, by the instrument wind of flowmeter current limliting Nafion is managed 8 outsides and purge, manage the dew-point temperature of the processing gas of 8 outputs with dew point hygrometer measuring N afion.
Experimentation: 1, measures ambient temperature and ambient humidity, record data.2, opening humidification adds device ambient air is carried out humidification.Open gas sampler 1 and temperature control device, when gas sampler 1 temperature rises to 120 ℃, open air pump 4.The adjusting flowmeter makes gas flow reach 4L/min and writes down its dew-point temperature.3, open instrument air generator 6, regulate flowmeter and make the instrument supply gas flow reach 16L/min, record Nafion manages the dew-point temperature of regulating the flow of vital energy in 8 inputs.4, the regulation meter throughput reaches 12L/min, the dew-point temperature of regulating the flow of vital energy in record Nafion pipe input.5, regulate humidifier humidity is on every side strengthened, the dew-point temperature of record sampler delivery outlet.The record experimental data is as follows:
By experimental data as can be seen: the degree of drying of Nafion pipe 8 has relation with the processing air humidity degree, the distinguished and admirable speed of instrument, the flow of process air speed that are input to Nafion pipe 8.Generally flow of process air speed is set in 1L/min in actual use, and the instrument supply gas flow velocity is set in 4L/min, this be a side and can protect instrument air generator 6, but the cost of lowering apparatus, instrument on the other hand.
In stationary source smoke on-line monitoring system, atmosphere environment supervision system and gas analyzer, need reach-20 ~ 0 ℃ to general of degree of drying handling gas and get final product.This shows that Nafion pipe 8 is a kind of good drying equipment in this field.
Claims (7)
1, removes the method for moisture content in the gas with the Nafion pipe, it is characterized in that comprising the steps:
(A), in gas sampler (1), be heated to 100～200 ℃ handling gas by heater block (7) by gas sampler (1) collection and treatment gas;
(B) the processing gas that has heated is filtered through millipore filter again;
(C) through the processing gas of millipore filter, by air pump (4) it is sent into the drier of being made up of Nafion pipe (8) (5), handling gas is 0.9～3 liter/minute at the inboard flow velocity of Nafion pipe (8); Simultaneously, blow in the dry gas that Nafion pipe (8) outside has the instrument air generator to produce, its flow velocity is 3～5 times of Nafion pipe (8) inboard flow of process air speed;
(D) the processing gas that blows out from Nafion pipe (8) is gas dry.
2, the method with moisture content in the Nafion pipe removal gas according to claim 1 is characterized in that being 110～120 ℃ to the temperature of handling the gas heating in the middle gas sampler (1) of step (1).
3, the method with moisture content in the Nafion pipe removal gas according to claim 1 is characterized in that the millipore filter in the step (2) is millipore filter (3) the two-stage series connection filtration of 1～5um millipore filter (2) and 0.1～0.2um.
4, according to claim 1ly remove the method for moisture content in the gas with Nafion pipe, it is characterized in that handling in the step (3) gas is 1 liter/minute at the inboard flow velocity of Nafion pipe (8), and the temperature that enters the processing gas of Nafion pipe (8) is 90～100 ℃.
5, the method for removing moisture content in the gas with the Nafion pipe according to claim 1, it is characterized in that the dry gas that step (3) is produced by instrument air generator (6), be that air is entered filter after by the oil water separator oil removing, through electronic refrigerator air themperature is reduced to below 4 ℃, further dry through heatless regeneration formula mole sieve drier again air, be dry gas until the air that reaches-70 ℃ dew point.
6, method of managing moisture content in the removal gas with Nafion according to claim 1 is characterized in that it is 4 times that Nafion manages (8) inboard flow of process air speed that the middle dry gas of step (3) is blown over the flow velocity in Nafion pipe (8) outside.
7, according to claim 1ly remove the method for moisture content in the gas, it is characterized in that direction that the flow direction that dry gas in the step (3) blows over Nafion pipe (8) outside and flow of process air cross Nafion pipe (8) inboard is opposite with Nafion pipe.
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| CN200910097307A CN101524617A (en) | 2009-04-09 | 2009-04-09 | Method for removing moisture in gases by a Nafion tube |
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| CN200910097307A CN101524617A (en) | 2009-04-09 | 2009-04-09 | Method for removing moisture in gases by a Nafion tube |
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| CN104007005A (en) * | 2014-05-27 | 2014-08-27 | 张家港朗亿机电设备有限公司 | Atmospheric dust concentration measurement equipment and method |
| CN104007006A (en) * | 2014-05-27 | 2014-08-27 | 张家港朗亿机电设备有限公司 | Dehumidification pipe of atmospheric sampling measuring instrument |
| CN104634900A (en) * | 2015-01-08 | 2015-05-20 | 聚光科技(杭州)股份有限公司 | Fixed pollution source emission monitoring system and fixed pollution source emission monitoring method |
| CN104707448A (en) * | 2013-12-15 | 2015-06-17 | 中国科学院大连化学物理研究所 | Gas dewatering device and using method thereof |
| CN106178854A (en) * | 2016-09-14 | 2016-12-07 | 上海神开石油化工装备股份有限公司 | The drying device of a kind of gas detection logging sample gas and drying means |
| CN107884440A (en) * | 2017-11-28 | 2018-04-06 | 上海清如环保科技有限公司 | A kind of flue gas dew point detection means |
| CN108254480A (en) * | 2016-12-29 | 2018-07-06 | 中国石油化工股份有限公司 | A kind of oxygen and carbon isotopes detecting system and detection method for carbonate rock |
| CN109374834A (en) * | 2018-11-13 | 2019-02-22 | 中国科学院合肥物质科学研究院 | Peroxy radical apparatus for measuring concentration for 90% or less atmospheric environment of relative humidity |
| CN109708929A (en) * | 2018-07-24 | 2019-05-03 | 深圳市云顶自动化技术有限公司 | A kind of flue gas sampling water scavenging system of CEMS |
| CN109765083A (en) * | 2018-12-26 | 2019-05-17 | 西安交通大学 | A kind of sampling of high-humidity gas fume particle and measuring device and its application method |
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| CN114062472A (en) * | 2021-10-14 | 2022-02-18 | 广西电网有限责任公司电力科学研究院 | Method for detecting sulfur dioxide in sulfur hexafluoride decomposition product by membrane sample injection |
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| CN115656084A (en) * | 2022-10-25 | 2023-01-31 | 广西电网有限责任公司电力科学研究院 | Detection method of perfluorohexanone |
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2009
- 2009-04-09 CN CN200910097307A patent/CN101524617A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104707448A (en) * | 2013-12-15 | 2015-06-17 | 中国科学院大连化学物理研究所 | Gas dewatering device and using method thereof |
| CN104007005A (en) * | 2014-05-27 | 2014-08-27 | 张家港朗亿机电设备有限公司 | Atmospheric dust concentration measurement equipment and method |
| CN104007006A (en) * | 2014-05-27 | 2014-08-27 | 张家港朗亿机电设备有限公司 | Dehumidification pipe of atmospheric sampling measuring instrument |
| CN104634900A (en) * | 2015-01-08 | 2015-05-20 | 聚光科技(杭州)股份有限公司 | Fixed pollution source emission monitoring system and fixed pollution source emission monitoring method |
| CN106178854A (en) * | 2016-09-14 | 2016-12-07 | 上海神开石油化工装备股份有限公司 | The drying device of a kind of gas detection logging sample gas and drying means |
| CN108254480A (en) * | 2016-12-29 | 2018-07-06 | 中国石油化工股份有限公司 | A kind of oxygen and carbon isotopes detecting system and detection method for carbonate rock |
| CN107884440A (en) * | 2017-11-28 | 2018-04-06 | 上海清如环保科技有限公司 | A kind of flue gas dew point detection means |
| CN109708929A (en) * | 2018-07-24 | 2019-05-03 | 深圳市云顶自动化技术有限公司 | A kind of flue gas sampling water scavenging system of CEMS |
| CN109374834A (en) * | 2018-11-13 | 2019-02-22 | 中国科学院合肥物质科学研究院 | Peroxy radical apparatus for measuring concentration for 90% or less atmospheric environment of relative humidity |
| CN109765083A (en) * | 2018-12-26 | 2019-05-17 | 西安交通大学 | A kind of sampling of high-humidity gas fume particle and measuring device and its application method |
| CN110898631A (en) * | 2019-12-26 | 2020-03-24 | 天津同阳科技发展有限公司 | Gas dryer |
| CN114062472A (en) * | 2021-10-14 | 2022-02-18 | 广西电网有限责任公司电力科学研究院 | Method for detecting sulfur dioxide in sulfur hexafluoride decomposition product by membrane sample injection |
| CN114594805A (en) * | 2022-01-26 | 2022-06-07 | 青岛明华电子仪器有限公司 | Flue gas humidity control method based on Nafion pipe |
| CN115656084A (en) * | 2022-10-25 | 2023-01-31 | 广西电网有限责任公司电力科学研究院 | Detection method of perfluorohexanone |
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