CN106621725A - Constant-temperature gas source humidity drying system - Google Patents
Constant-temperature gas source humidity drying system Download PDFInfo
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- CN106621725A CN106621725A CN201710068787.9A CN201710068787A CN106621725A CN 106621725 A CN106621725 A CN 106621725A CN 201710068787 A CN201710068787 A CN 201710068787A CN 106621725 A CN106621725 A CN 106621725A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
- B01D2253/1085—Zeolites characterized by a silicon-aluminium ratio
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Gases (AREA)
Abstract
The invention provides a constant-temperature gas source humidity drying system, which comprises a gas source subsystem (1) and an incubator subsystem (2), wherein the gas source subsystem (1) comprises an air compressor (11), a float flowmeter (12), an air drier (13), and a mass flowmeter (14), and the incubator subsystem (2) comprises a plurality of valves and a plurality of osmosis rooms. Compared with the prior art, the constant-temperature gas source humidity drying system provided by the invention adopts a flow controller method, so that accuracy is greatly increased, the accurate regulation of flow is realized by using the mass flowmeter, and thereby the whole constant-temperature gas source humidity drying system not only performs drying, but also ensures high precision and high regulation speed.
Description
Technical field
The present invention relates to the source of the gas humidity freeze-day with constant temperature system in a kind of humidity generator for osmosis, belongs to environment survey
Amount field.
Background technology
The measurement of humidity and control, it is significant in the development of the national economy.Because humidity affects nature
Physics, chemistry and bioprocess；Affect the characteristic of many aspects of gas, including heat, electricity, light and transmittance process；Can also affect
Moisture in material, the size for causing material changes, and in addition humidity can also cause corrosion of metal, or even can determine
Biological final and decisive juncture etc..The measurement of humidity is also widely used for Aeronautics and Astronautics, storage, meteorology, electric power, oil with control
The fields such as chemical industry, semiconductor manufacturing, atomic energy, microelectronics, ultra-pure gases feed system.Moisture measurement has become international standard
Change tissue technical committee's focus of attention relevant with the world.In ISO9000 Quality System certification, ISO17025 Laboratory Accreditations
In humid control is clearly required.Technology controversial issue, guarantee product that one good environmental quality can reduce thus to cause
Quality.In addition, with the development of the modern industries such as petrochemical industry, electronics, electric power, metallurgy, aerospace, atomic energy, ultralow temperature etc.
The fast development of advanced science technology, low humidity measurement is increasingly subject to the attention of people with control, and finds broad application.With stone
The advanced science technologies such as the development of the modern industries such as oiling work, electronics, electric power, metallurgy, aerospace, atomic energy, ultralow temperature it is quick
Development, at present for low humidity measurement demand also increasingly increases.
Principle of the osmosis humidity generator design based on osmosis.The principle of osmosis is based on dry carrier gas with certain
Flow velocity takes away the aqueous vapor for penetrating a certain film.When the side of film contacts with pure water, and opposite side flows through one dry gas, due to film two
The aqueous vapor partial pressure of side is different, and then aqueous vapor is permeated by film to opposite side.The aqueous vapor constant flow rate infiltrated by osmos tube
Dry carrier gas all carry out, export after uniform mixing, obtain the certain moisture of water vapour content.When change temperature,
During the osmos tube of dry gas flow or the different permeabilities of replacing, the gas of different humidity can be just obtained.Material permeance permeable membrane oozes
Thoroughly rate depends on the barometric gradient of property, constituent, the area of permeable membrane, temperature and the film both sides of material used itself.
According to GB JJG2046-90《Psychrometry utensil verification system》, the calibration of low humidity measuring instrumentss can take figure
Two ways shown in 1.It can be seen that humidity generator is requisite in humidity instrument calibration process.In order that
Humidity generator can farthest play a role, and process formation regime flow is dried to air meets various indexs
The low humidity air of requirement is the inevitable configuration of humidity generator, but can realize similar work(currently without preferable device
Energy.
The content of the invention
In view of above-mentioned the deficiencies in the prior art part, it is an object of the invention to provide a kind of source of the gas humidity freeze-day with constant temperature system
System.
In order to achieve the above object, this invention takes technical scheme below：
A kind of source of the gas humidity freeze-day with constant temperature system, including source of the gas subsystem and insulating box subsystem, wherein the source of the gas subsystem
It is made up of air compressor, suspended body flowmeter, dried-air drier and mass flowmenter, the insulating box subsystem is by multiple valves
Constitute with multiple infiltration rooms；The air compressor, suspended body flowmeter, dried-air drier and mass flowmenter are entered according to air
Direction set gradually, the plurality of infiltration room include first infiltration room, second infiltration room and the 3rd infiltration room, three infiltration rooms
It is distributed symmetrically, is set up in parallel, the plurality of valve includes that the first valve and the second valve are separately positioned on the two of three infiltration rooms
End.
Preferably, above-mentioned multiple infiltration chamber interiors are provided with osmos tube, and osmos tube is polytetrafluoroethylene (PTFE) or polytetrafluoroethyl-ne
Alkene propylene material is made, wall thickness 0.3mm～0.5mm.
Preferably, above-mentioned osmos tube is placed in 100 DEG C of thermostat, is placed 24 hours, by the selected time interval cycle
Ground weighs the weight change of osmos tube, so as to draw the permeability of osmos tube.
Preferably, above-mentioned drying system passes through first oil-free air compressor absorption air from surrounding environment, through pressure
Contract to gas pressurized while deoiling, the infiltration room that gas is entered in insulating box subsystem mixes with vapor, and suspended body flowmeter sets
Put between air compressor and dried-air drier；Mass flowmenter is arranged between source of the gas subsystem and insulating box subsystem.
Preferably, air sequentially passes through air compressor in source of the gas subsystem, suspended body flowmeter, dried-air drier and matter
Amount flowmeter becomes and is dried carrier gas, then through insulating box subsystem, low humidity gas is formed from after multiple infiltration rooms.
Compared to the source of the gas humidity freeze-day with constant temperature system that prior art, the present invention are provided, volume control device is employed
Mode causes the degree of accuracy to greatly improve, and by the use of mass flowmenter accurate adjustment flow is realized so that overall freeze-day with constant temperature
System is not only dried, while ensure that high precision governing speed is fast.
Description of the drawings
Fig. 1 (a) and Fig. 1 (b) is humidity calibrating indicating instrument block diagram；
Fig. 2 is source of the gas humidity freeze-day with constant temperature system structure diagram of the present invention；
Fig. 3 (a) is A type structure osmos tube structural representations；
Fig. 3 (b) is Type B structure osmos tube structural representation；
Fig. 3 (c) is c-type structure osmos tube structural representation.
Reference：1- source of the gas subsystems；11- air compressors；12- suspended body flowmeters；13- dried-air driers；14- matter
Amount flowmeter；2- insulating box subsystems；21- first permeates room；22- second permeates room；23- the 3rd permeates room；The valves of 24- first
Door；The valves of 25- second；3- air；4- is dried carrier gas；5- low humidity gases.
Specific embodiment
The present invention provides a kind of source of the gas humidity freeze-day with constant temperature system, to make the purpose of the present invention, technical scheme and effect more
Plus it is clear, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that described herein
Specific embodiment only to explain the present invention, be not intended to limit the present invention.
As shown in figure 1, the source of the gas humidity freeze-day with constant temperature system that the present invention is provided, including source of the gas subsystem 1 and constant temperature chest
System 2, wherein source of the gas subsystem 1 are by air compressor 11, suspended body flowmeter 12, dried-air drier 13 and the structure of mass flowmenter 14
Into insulating box subsystem 2 is made up of multiple valves and multiple infiltration rooms；Air compressor 11, suspended body flowmeter 12, it is air-dried
Machine 13 and mass flowmenter 14 set gradually according to the direction that air 3 is entered, and multiple infiltration rooms include the first infiltration room 21, second
Infiltration room 22 and the 3rd infiltration room 23, three infiltration rooms are distributed symmetrically, and are set up in parallel, and multiple valves include the first valve 24 and the
Two valves 25 are separately positioned on the two ends of three infiltration rooms.
Source of the gas subsystem 1 include oil-free air compressor 11, suspended body flowmeter 12, air dryer 13 and mass flow
Meter 14, it provides for humidity generator and is dried carrier gas.The effect for being dried carrier gas is the vapor produced in infiltration room and osmos tube
It is sufficiently mixed, as the carrier of vapor.In the present embodiment, using an oil-free air compressor and a dried-air drier
Carrier gas is dried to prepare.Oil-free air compressor absorption air from surrounding environment, deoils simultaneously through compression to gas pressurized.
The purpose deoiled is to subsequently reach in drying machine optimum drying effect.
Certain pressure and flow velocity is provided with through the gas of air compressor, afterwards air inlet drying machine.It is final defeated
The water content gone out in low humidity gas should all be produced by osmos tube, so can be according to the material of osmos tube, shape, temperature
Degree calculates permeability such that it is able to produce satisfactory low humidity gas.It requires the water content pole of the carrier of vapor
Its is low, reaches negligible degree.After dried-air drier, the infiltration room that gas is entered in insulating box is mixed with vapor
Close.
In order to reach the purpose for adjusting flow, a float-type is connected between air compressor and dried-air drier
Meter；A mass flowmenter is connected between dried-air drier and insulating box.The effect of suspended body flowmeter is coarse adjustment flow, to essence
Degree is less demanding, but because the gas of air compressor output has larger pressure, thus float stream is required in terms of intensity
Gauge can bear larger pressure.The effect of mass flowmenter is accurate adjustment flow, is dried the flow of carrier gas and oozing for osmos tube
Thoroughly rate has together decided on the humidity of final output gas, so the requirement to mass flowmenter is high precision, governing speed is fast.
Because osmosis humidity generator belongs to low dew point standard humidity generator, therefore source of the gas using dry air,
Ask the dew point of source of the gas less than -70 DEG C, dried-air drier need to be increased process is dried to the gas being input into.
The conventional active aluminum oxide of adsorbent of drying machine and molecular sieve, for adsorption capacity, both adsorbents are all
It is very outstanding.Activated alumina is also comprehensive while having powerful adsorption capacity to possess many excellent physics and chemical property.
Therefore, in most of driers first-selection activated alumina, especially in the case of heatless regeneration, activated alumina almost obtains high
In the inevitable choice of -40 DEG C of dew-point temperature compressed airs.But, adsorption capacity of the adsorbent under low moisture environment can not show a candle to
Such as molecular sieve, so obtaining low drying compressed air, when dew-point temperature is less than -60 DEG C, then needs to select molecular sieve.
Molecular sieve heat endurance is good, chemical stability is high and the characteristics of strong absorption property.From for adsorption property, with activity
Other adsorbents such as charcoal, silica gel, aluminum oxide compare, and are characterized in：
（1）The characteristic of the selective absorption of molecular sieve, due to the pore pore size of molecular sieve be it is certain, can only energy of adsorption
By the molecule in these ducts, the molecule different for shapes and sizes, molecular diameter it is bigger than aperture cannot enter pore
Inside.
（2）In molecular sieve pore passage, with respect to the phenomenon that hole wall can produce field of force superposition so as to which adsorptivity is significantly improved, therefore
Still there is sizable adsorption capacity at higher temperatures, such as in the case where water vapor pressure is relatively low, other adsorbents have than silica gel etc.
Higher adsorption capacity, and can also keep higher adsorption capacity in high temperature.
（3）Molecular sieve is polar adsorbent, and its suction-operated depends not only on adsorbed material molecular diameter, and by it
The impact of polarity, such as to polar molecule, especially there is very big affinity to water.
Molecular sieve has 3A, 4A, 5A three types.The aperture of 5A molecular sieves about 5A, commonly referred to as calcium molecular sieve.It is removed has
Outside effect that 3A, 4A molecular sieve has, the organic solvent such as also adsorbable C3-C4 n-alkanes, chloroethanes, bromoethane, butanol.
Flow controller adopts mass flowmenter, the mass flowmenter degree of accuracy to greatly improve than before, the degree of accuracy up to 1%,
Meet the needs of osmosis humidity generation.
Insulating box subsystem 2 is by three infiltration rooms：First infiltration room 21, second infiltration room the 22, the 3rd infiltration room 23 and
Two valves：First valve 24 and the second valve 25 are constituted.The distribution of three infiltration rooms should be symmetrical, so be conducive to heat
Being uniformly distributed for amount, while to select suitable material in selection, accomplishes to not only improve heat conduction, and weight can be mitigated again
Amount.It is further noted that the necessary synchronism switching of the valve at infiltration room two ends, so just can guarantee that the gas of different humidity not
Can interfere.
Osmos tube is placed with infiltration room, conventional osmos tube type there are three kinds, as shown in Figure 3.What the system was adopted
It is Type B structure, it is main to consider convenient making.Because A types structure needs osmos tube to couple together with stainless steel tube；C-type structure
Needs couple together osmos tube with glass tube.Both link sealings are not enough, it is easy to be caused by sealing bad and producing
Raw moisture leakage.
Configuration to osmos tube, is the material for selecting suitably to do osmos tube first.The general polytetrafluoro for choosing stable performance
Ethene or polytetrafluoroethylene (PTFE) propylene material, it is desirable to even tube wall, zero defect and mechanical damage.When the pipe thickness of osmos tube is more than
Permeability is less during 0.5mm, insufficient strength when wall thickness is less than 0.2mm, is typically chosen tubing of the wall thickness in 0.3mm～0.5mm.No
The geometric parameter that same infiltrating area has different permeabilities, osmos tube can be designed as needed.
Next to that the pretreatment of osmos tube.Because the material and its density, thickness, effective permeable face of infiltration rate and film
Product, the physical characteristic of material（Such as hydrophilic or hydrophobic）And the water vapor partial pressure difference of film both sides etc. is relevant.Water wetted material is compared with hydrophobic material
Material has higher permeability, and the former generally contains more water soluble or the material that can be taken by water quenching than the latter.These materials
If thoroughly do not removed its infiltration rate to water will be made to change with the time, so as to affect the stability of permeability.So
Need to be pre-processed when osmos tube is made, cleaned and soaked with water and appropriate organic solvent, and than work temperature
Activate at the slightly higher temperature of degree（Burin-in process）For a period of time, this is to obtain the stable requisite program of permeance property.
It is finally the permeability demarcation of osmos tube.The reasons such as the inhomogeneities due to manufacture craft and material structure, can not
The identical osmos tube of permeability can be produced.Therefore, for different osmos tubes under same environment then has different oozing
Saturating rate.For each osmos tube, the numerical value of its permeability will be demarcated individually, and the method for demarcation is to adopt weight method.Examine
Consider cast, vapour pressure property and suitable permeability, osmos tube is generally demarcated at 100 DEG C.Its method is to permeate
Pipe is placed in 100 DEG C of thermostat, places the regular hour, and usually 24h, by selected time interval infiltration is weighed periodically
The weight change of pipe, so as to draw the permeability of osmos tube.
The present invention operation principle be：Air 3 sequentially passes through the air compressor 11, float-type in source of the gas subsystem 1
Become after meter 12, dried-air drier 13 and mass flowmenter 14 and be dried carrier gas 4, then through insulating box subsystem 2, from multiple infiltrations
Room（21、22、23）Low humidity gas 5 is formed afterwards.
Dried-air drier 13 is dried carrier gas to prepare.Absorption air 3 from surrounding environment of oil-free air compressor 11, pass through
Compress and pressurizeed while deoiling to gas 3.The purpose deoiled is imitated to subsequently reach optimum drying in the drying machine 13 of air 3
Really.Certain pressure and flow velocity is provided with through the gas of air compressor 11, afterwards air inlet drying machine 13.In design side
In case, the water content in final output low humidity gas should all be produced by osmos tube, so can be according to osmos tube
Material, shape, temperature calculate permeability such that it is able to produce satisfactory low humidity gas.It requires the load of vapor
The water content of body is extremely low, reaches negligible degree.After dried-air drier 13, gas enters insulating box subsystem 2
In infiltration room 21,22,23, mix with vapor.It is dry in air compressor 11 and air in order to reach the purpose for adjusting flow
A suspended body flowmeter 12 is connected between dry machine 13；A quality is connected between dried-air drier 13 and insulating box subsystem 2
Flowmeter 14, as shown in Figure 2.The effect of suspended body flowmeter 12 is bigness scale flow, not high to required precision, but due to air compression
The gas of the output of machine 11 has larger pressure, thus requires that suspended body flowmeter 12 can bear larger pressure in terms of intensity
Power.The effect of mass flowmenter 14 is accurate measurement flow, and the permeability of the flow and osmos tube that are dried carrier gas has been together decided on finally
The humidity of output gas, so the requirement to mass flowmenter 14 is high precision, good stability.
Compared to the source of the gas humidity freeze-day with constant temperature system that prior art, the present invention are provided, volume control device is employed
Mode causes the degree of accuracy to greatly improve, and by the use of mass flowmenter accurate adjustment flow is realized so that overall freeze-day with constant temperature
System is not only dried, while ensure that high precision governing speed is fast.
It is understood that for those of ordinary skills, can be with technology according to the present invention scheme and its invention structure
Think in addition equivalent or change, and all these changes or replace the protection model that should all belong to appended claims of the invention
Enclose.
Claims (6)
1. a kind of source of the gas humidity freeze-day with constant temperature system, it is characterised in that：The source of the gas humidity freeze-day with constant temperature system includes source of the gas
System（1）With insulating box subsystem（2）, wherein the source of the gas subsystem（1）By air compressor（11）, suspended body flowmeter
（12）, dried-air drier（13）And mass flowmenter（14）Constitute, the insulating box subsystem（2）By multiple valves and multiple ooze
Thoroughly room is constituted；The air compressor（11）, suspended body flowmeter（12）, dried-air drier（13）And mass flowmenter（14）According to
Air（3 directions for entering set gradually, and the plurality of infiltration room includes the first infiltration room（21）, second infiltration room（22）With
Three infiltration rooms（23）, three infiltration rooms are distributed symmetrically, are set up in parallel.
2. source of the gas humidity freeze-day with constant temperature system as claimed in claim 1, it is characterised in that：The plurality of valve includes the first valve
Door（24）With the second valve（25）It is separately positioned on the two ends of three infiltration rooms.
3. source of the gas humidity freeze-day with constant temperature system as claimed in claim 1, it is characterised in that：The plurality of infiltration chamber interior is all provided with
Osmos tube is equipped with, osmos tube is made up of polytetrafluoroethylene (PTFE) or polytetrafluoroethylene (PTFE) propylene material, wall thickness 0.3mm～0.5mm.
4. source of the gas humidity freeze-day with constant temperature system as claimed in claim 3, it is characterised in that：The osmos tube is placed in 100 DEG C
In thermostat, place 24 hours, the weight change of osmos tube is weighed periodically by selected time interval, so as to draw osmos tube
Permeability.
5. source of the gas humidity freeze-day with constant temperature system as claimed in claim 1, it is characterised in that：The drying system passes through first nothing
Oily air compressor（11）The absorption air from surrounding environment（3）, through compression to gas（3）Pressurization is deoiled simultaneously, gas（3）
Into insulating box subsystem（2）In infiltration room（21、22、23）, mix with vapor, suspended body flowmeter（12）It is arranged on air
Compressor（11）And dried-air drier（13）Between；Mass flowmenter（14）It is arranged on source of the gas subsystem（1）With insulating box subsystem
System（2）Between.
6. source of the gas humidity freeze-day with constant temperature system as claimed in claim 1, it is characterised in that：Air（3）Sequentially pass through source of the gas
System（1）In air compressor（11）, suspended body flowmeter（12）, dried-air drier（13）And mass flowmenter（14）Become dry
Dry carrier gas（4）, then through insulating box subsystem（2）, from multiple infiltration rooms（21、22、23）Low humidity gas is formed afterwards（5）.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016110050970 | 2016-11-15 | ||
| CN201611005097 | 2016-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106621725A true CN106621725A (en) | 2017-05-10 |
Family
ID=58844671
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710068787.9A Withdrawn CN106621725A (en) | 2016-11-15 | 2017-02-08 | Constant-temperature gas source humidity drying system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121996A (en) * | 2017-07-04 | 2017-09-01 | 南京信息工程大学 | A kind of constant temperature and humidity control device and control method |
| WO2018090219A1 (en) * | 2016-11-15 | 2018-05-24 | 钟玲珑 | Air source humidity constant temperature drying system used in permeation-type humidity generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639704A (en) * | 2009-08-19 | 2010-02-03 | 中国辐射防护研究院 | Air current control system capable of continuously producing temperature, relative humidity, and pressure-controllable air current |
| CN101738454A (en) * | 2009-12-31 | 2010-06-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | Penetration type humidity generator |
| WO2016011818A1 (en) * | 2014-07-25 | 2016-01-28 | 株洲高新技术产业开发区壹星科技有限公司 | Method of drying humid air and modular air dryer |
| CN206676200U (en) * | 2016-11-15 | 2017-11-28 | 钟玲珑 | Source of the gas humidity freeze-day with constant temperature system |
-
2017
- 2017-02-08 CN CN201710068787.9A patent/CN106621725A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639704A (en) * | 2009-08-19 | 2010-02-03 | 中国辐射防护研究院 | Air current control system capable of continuously producing temperature, relative humidity, and pressure-controllable air current |
| CN101738454A (en) * | 2009-12-31 | 2010-06-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | Penetration type humidity generator |
| WO2016011818A1 (en) * | 2014-07-25 | 2016-01-28 | 株洲高新技术产业开发区壹星科技有限公司 | Method of drying humid air and modular air dryer |
| CN206676200U (en) * | 2016-11-15 | 2017-11-28 | 钟玲珑 | Source of the gas humidity freeze-day with constant temperature system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090219A1 (en) * | 2016-11-15 | 2018-05-24 | 钟玲珑 | Air source humidity constant temperature drying system used in permeation-type humidity generator |
| CN107121996A (en) * | 2017-07-04 | 2017-09-01 | 南京信息工程大学 | A kind of constant temperature and humidity control device and control method |
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