CN110327798A - A kind of gas concentration control system and method - Google Patents
A kind of gas concentration control system and method Download PDFInfo
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- CN110327798A CN110327798A CN201910622470.4A CN201910622470A CN110327798A CN 110327798 A CN110327798 A CN 110327798A CN 201910622470 A CN201910622470 A CN 201910622470A CN 110327798 A CN110327798 A CN 110327798A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
- B01F23/191—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means characterised by the construction of the controlling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/70—Pre-treatment of the materials to be mixed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/2201—Control or regulation characterised by the type of control technique used
- B01F35/2206—Use of stored recipes for controlling the computer programs, e.g. for manipulation, handling, production or composition in mixing plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
- B01F35/718051—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings being adjustable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a kind of gas concentration control system and methods, including rack, are installed on the CO of rack2Adsorbent tank group and the controller being installed in front of rack, CO2Adsorbent tank group includes CO2Adsorbent tank A, CO2Adsorbent tank B, CO2Adsorbent tank C and CO2Adsorbent tank D, CO2Adsorbent tank A and CO2Adsorbent tank B is installed on the top of rack, CO2Adsorbent tank A and CO2The front of adsorbent tank B is connected by connecting tube A, CO2Adsorbent tank A and CO2The back side of adsorbent tank B is connected by connecting tube B, CO2Adsorbent tank C and CO2The front of adsorbent tank D is connected by connecting tube C, CO2Adsorbent tank C and CO2The back side of adsorbent tank D is connected by connecting tube D；Manual ball valve A is installed on connecting tube A, manual ball valve C is installed on connecting tube B, manual ball valve D is installed on connecting tube D.The gas control of extremely low concentration may be implemented in the present invention, by taking the control of growth chamber CO2 concentration as an example, minimum can realize close to 0ppm.
Description
Technical field
The present invention relates to a kind of gas concentration control system, in particular to a kind of gas concentration control system and method.
Background technique
Current plant scientific research field is needed to plant in high and low CO2Growth and development under concentration environment is studied.It is international
Upper existing growth chamber uses infrared CO2Sensor acquires signal, generally 4-20mA 0-5v signal, uses intelligence
Can PID controller required concentration value is set, and control and remove CO2Access (low CO2Concentration) or supplement CO2Access (high CO2Concentration)
Work.Supplement CO2Mode it is essentially the same, be CO2 steel cylinder gas decompression after, use solenoid valve control flow.Removing CO2Side
Face, always without effective solution method, numerous producers use centrifugal blower that the air in closed container is imported CO in the world2
Adsorbent case (generally soda lime, calcium hydroxide etc.) Lai Shixian, disadvantage is relatively more, there is the following:
It, can not CO2 concentration in long-time stable experimental box 1. since CO2 absorbent container airtightness itself is poor.
2. CO2 adsorbent is consumables, after the CO2 saturation of absorption, need to change new adsorbent again after taking out, this
Sample results in the fluctuation of CO2 concentration in experimental box, influences experimental result, and needs often to unpack and check the color of CO2 adsorbent
Change (can determine whether to be saturated by color change).
3. centrifugal blower air quantity is all bigger, it be easy to cause wind direction disorder in experimental box.
4. CO2Adsorbent is particle or powder, be easy to cause experimental situation to pollute in replacement.
Summary of the invention
The purpose of the present invention is to provide a kind of gas concentration control system and methods, and the gas of extremely low concentration may be implemented
Control minimum can be realized close to 0ppm, to solve to mention in above-mentioned background technique by taking the control of growth chamber CO2 concentration as an example
Out the problem of.
To achieve the above object, the invention provides the following technical scheme:
A kind of gas concentration control system including rack, is installed on the CO of rack2It adsorbent tank group and is installed in front of rack
Controller, the CO2Adsorbent tank group includes CO2Adsorbent tank A, CO2Adsorbent tank B, CO2Adsorbent tank C and CO2Absorption
Agent tank D, CO2Adsorbent tank A and CO2Adsorbent tank B is installed on the top of rack, CO2Adsorbent tank A and CO2Adsorbent tank B's
Front is connected by connecting tube A, CO2Adsorbent tank A and CO2The back side of adsorbent tank B is connected by connecting tube B, CO2Adsorbent
Tank C and CO2Adsorbent tank D is installed on the intermediate bulkhead of rack, CO2Adsorbent tank C and CO2The front of adsorbent tank D passes through company
Adapter tube C connection, CO2Adsorbent tank C and CO2The back side of adsorbent tank D is connected by connecting tube D；
Manual ball valve A is installed on the connecting tube A, manual ball valve B is installed on connecting tube C, manual ball valve C is installed on connecting tube B,
Manual ball valve D is installed, the threeway for connecting connecting tube A and connecting tube C also connect with conduit A, pacifies on conduit A on connecting tube D
Blower is filled, the threeway for connecting connecting tube B and connecting tube D is also connect with conduit B.
Further, the conduit A is connect with target container, and the pipeline between blower and target container is also connected with CO2
Supplement gas source, CO2Solenoid valve is installed, solenoid valve is connected by signal wire with controller on supplement gas source.
Further, the conduit B is connect with target container.
Further, the controller and blower access 220V power supply, and controller is connected with blower by signal wire.
Further, 220V alternating current is transformed into 24V direct current by transformer and supplies electricity to target container by the 220V power supply
Built-in CO2Sensor and solenoid valve power supply.
Further, the CO2Sensor is connect by signal wire with controller.
Further, CO2Adsorbent tank A and CO2Adsorbent tank B is A group adsorption system, CO2Adsorbent tank C and CO2It inhales
Attached dose of tank D is B group adsorption system, and two groups are backed up mutually.
Another technical solution provided by the invention is: a kind of gas concentration control method, including obtains low carbon dioxide
Environment and acquisition two steps of high carbon dioxide environment, two steps are specific as follows:
A, experiment purpose is when needing to obtain low carbon dioxide environment
A1: when the running of A group adsorption system, manual ball valve C and manual ball valve A is opened manually, closes manual ball valve B and hand
Dynamic ball valve D, B group adsorption system stop working；
A2: when A group adsorption system adsorbent saturation need replacing adsorbent when, be turned off manually manual ball valve C and manually
Ball valve A stops the work of A group adsorption system, while the adsorption system of manually opened manual ball valve B and manual ball valve D, B group is just
It starts operation；
B, experiment purpose is when needing to obtain high carbon dioxide environment
B1: the concentration of carbon dioxide existing concentration PV value and the carbon dioxide for needing to set in controller displaying target container box
SV value；
B2: when the SV concentration of setting is higher than existing concentration PV, controller can power to solenoid valve opens solenoid valve, makes CO2It mends
Carbon dioxide gas in inflation source is directly entered target container cabinet, increases the gas concentration lwevel of target container cabinet,
When reaching setting concentration, controller can stop powering to solenoid valve, make its closing, can accurately realize high dioxy in this way
Change the control of concentration of carbon.
Compared with prior art, the beneficial effects of the present invention are: gas concentration control system of the present invention and method, pass through gas
The digital signal of the 0-10v or 4-20ma that measure are fed back to PID by the gas concentration in concentration sensors monitoring objective container
Controller gives electric control blower by controller when low concentration is arranged, and carries out negative-pressure ward, and air passes through CO2After adsorbent tank
Available light concentration gas, sends back in target container again；When high concentration is arranged, supplied by controller to stepping solenoid valve
Electricity injects high concentrations of gas, using this system, can accurately control gas concentration in target container, control range 0-100%, dense
Degree control precision ± 5ppm, the gas control that extremely low concentration may be implemented can be with by taking the control of growth chamber CO2 concentration as an example
It is minimum to realize close to 0ppm.
Detailed description of the invention
Fig. 1 is the positive structure schematic of gas concentration control system of the present invention；
Fig. 2 is the structure schematic diagram of gas concentration control system of the present invention；
Fig. 3 is the partial enlarged view of Fig. 1 of the present invention；
Fig. 4 is the partial enlarged view of Fig. 2 of the present invention；
Fig. 5 is gas concentration control system schematic diagram of the present invention.
In figure: 1, CO2Adsorbent tank A；2,CO2Adsorbent tank B；3,CO2Adsorbent tank C；4,CO2Adsorbent tank D；5, hand
Dynamic ball valve C；6, manual ball valve A；7, manual ball valve B；8, manual ball valve D；9, blower；10, controller；11, transformer；12, electric
Magnet valve；13,CO2Sensor；14,CO2Supplement gas source；15,220V power supply；16, target container；17, rack；18, connecting tube A；
19, connecting tube B；20, connecting tube C；21, connecting tube D；22, conduit A；23, conduit B.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Refering to fig. 1-2, a kind of gas concentration control system including rack 17, is installed on the CO of rack 172Adsorbent tank group
And it is installed on the controller 10, CO in 17 front of rack2Adsorbent tank group includes CO2Adsorbent tank A1, CO2Adsorbent tank B2,
CO2Adsorbent tank C3 and CO2Adsorbent tank D4, CO2Adsorbent tank A1 and CO2Adsorbent tank B2 is installed on the top of rack 17,
CO2Adsorbent tank A1 and CO2The front of adsorbent tank B2 is connected by connecting tube A18, CO2Adsorbent tank A1 and CO2Adsorbent tank
The back side of B2 is connected by connecting tube B19, CO2Adsorbent tank A1 and CO2Adsorbent tank B2 is A group adsorption system, CO2Adsorbent
Tank C3 and CO2Adsorbent tank D4 is installed on the intermediate bulkhead of rack 17, CO2Adsorbent tank C3 and CO2The front of adsorbent tank D4
It is connected by connecting tube C20, CO2Adsorbent tank C3 and CO2The back side of adsorbent tank D4 is connected by connecting tube D21, CO2Absorption
Agent tank C3 and CO2Adsorbent tank D4 is B group adsorption system, is in the relationship backed up mutually with A group adsorption system, such one is standby
One scheme can guarantee entire experiment normal use, experiment will not be caused to occur because of the replacement of adsorbent out of stock.
Refering to Fig. 3-4, manual ball valve A6 is installed on connecting tube A18, manual ball valve B7, connecting tube are installed on connecting tube C20
Manual ball valve C5 is installed on B19, manual ball valve D8 is installed, each ball valve mating reaction is for adjusting respective pipe on connecting tube D21
The circulation in road, the threeway for connecting connecting tube A18 and connecting tube C20 are also connect with conduit A22, install blower on conduit A22
9, the threeway for connecting connecting tube B19 and connecting tube D21 is also connect with conduit B23, and conduit B23 is connect with target container 16.
Conduit A22 is connect with target container 16, and the pipeline between blower 9 and target container 16 is also connected with CO2Supplement gas source 14, CO2It mends
Solenoid valve 12 is installed, solenoid valve 12 is connected by signal wire and controller 10 in inflation source 14.
Controller 10 and blower 9 access 220V power supply 15, and controller 10 is connected with blower 9 by signal wire.220V electricity
220V alternating current is transformed into 24V direct current by transformer 11 and supplies electricity to CO built in target container 16 by source 152Sensor 13 and
Solenoid valve 12 is powered.CO2Sensor 13 is connect by signal wire with controller 10.
Based on above-mentioned gas concentration control system, it is proposed that a kind of gas concentration control method, including obtain low dioxy
Change carbocyclic ring border and acquisition two steps of high carbon dioxide environment, such as Fig. 5, two steps are specific as follows:
A, experiment purpose is when needing to obtain low carbon dioxide environment
A1: when the running of A group adsorption system, manual ball valve C5 and manual ball valve A6 is opened manually, closes manual ball valve B7
With manual ball valve D8, B group adsorption system stops working；
A2: when A group adsorption system adsorbent saturation need replacing adsorbent when, be turned off manually manual ball valve C5 and manually
Ball valve A6 stops the work of A group adsorption system, while the adsorption system of manually opened manual ball valve B7 and manual ball valve D8, B group
It begins to operate, realizes perfect connection.Such one can guarantee entire experiment normal use for one scheme, will not be because of suction
It is out of stock that attached dose of replacement causes experiment to occur.
B, experiment purpose is when needing to obtain high carbon dioxide environment
B1: the carbon dioxide that carbon dioxide existing concentration PV value and needs are set in 10 displaying target container of controller, 16 cabinet
Concentration SV value；
B2: when the SV concentration of setting is higher than existing concentration PV, controller 10 can be such that solenoid valve 12 opens, make to the power supply of solenoid valve 12
CO2Carbon dioxide gas in supplement gas source 14 is directly entered 16 cabinet of target container, makes the titanium dioxide of 16 cabinet of target container
Concentration of carbon increases, and when reaching setting concentration, controller 10 can stop powering to solenoid valve 12, makes its closing, such energy
The accurate control for realizing high carbon dioxide concentration.
The principle of work and power of the invention:
Carbon dioxide control system connects 220V DC power supply, and the fortune of entire carbon dioxide control system is controlled by controller 10
Make.System built-in transformer 11, external power supply access system transformer 11, is then divided into two-way, powers all the way to solenoid valve 12,
CO is given all the way2Sensor 13 is powered.
The existing concentration PV value of carbon dioxide and the gas concentration lwevel SV value for needing to set in 10 show case body of controller.
When PV concentration be higher than setting SV concentration, controller 10 will fan 9 power, blower 9 start to work, the intracorporal air of case
It is sucked out, A group adsorption system is entered by air inlet pipe and is filtered absorption, then is reentered in cabinet by conduit B23, is followed
Ring, until the intracorporal gas concentration lwevel of case reaches setting value, controller 10 will stop the power supply of fan 9, stop blower 9
Work.Accurate low carbon dioxide control can be tested.
The present invention uses 2 groups or 2 groups or more hermetic type CO2Adsorbent tank is installed in parallel, one group of use, another set or more
Group is spare, also can arbitrarily switch multiple CO2Adsorbent tank, to increase filter capacity；Use the hermetic type CO of all-transparent2Adsorbent
Tank can directly observe whether adsorbent is saturated.As one group of (usually 2) CO2It, can hand after adsorbent has been saturated in adsorbent tank
It is dynamic to close access valve, switch to 1 group of other CO2The work of adsorbent tank, realizes seamless connection；Hermetic type CO2Adsorbent tank has
The models such as 5L, 10L, 20L, adsorbent loading density is big, and adsorption effect is good；Closed CO2Adsorbent tank is not required to scene replacement and inhales
Attached dose, experimental situation is pollution-free；Use the blower 9 of DC frequency-changing as air circulation power, air mass flow is from the hundreds of L/ of 0- points
Clock, by PID controller linear regulation wind speed, it is ensured that control precision.
In summary: gas concentration control system of the present invention and method pass through gas concentration sensor monitoring objective container
The digital signal of the 0-10v or 4-20ma that measure are fed back to PID controller by interior gas concentration, when low concentration is arranged, by
Controller 10 gives electric control blower 9, carries out negative-pressure ward, and air passes through CO2Available light concentration gas after adsorbent tank, weight
Newly send back in target container 16；It when high concentration is arranged, is powered by controller 10 to stepping solenoid valve 12, injects high concentration gas
Body can accurately control gas concentration in target container 16, control range 0-100% using this system, concentration control precision ±
The gas control of extremely low concentration may be implemented in 5ppm, and by taking the control of growth chamber CO2 concentration as an example, control minimum at present is dense
Degree is 100ppm, and uses system of the invention, minimum can be realized close to 0ppm.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of gas concentration control system, which is characterized in that including rack (17), be installed on the CO of rack (17)2Adsorbent tank
Group and the controller (10) being installed in front of rack (17), the CO2Adsorbent tank group includes CO2Adsorbent tank A(1), CO2
Adsorbent tank B(2), CO2Adsorbent tank C(3) and CO2Adsorbent tank D(4), CO2Adsorbent tank A(1) and CO2Adsorbent tank B
(2) top of rack (17), CO are installed on2Adsorbent tank A(1) and CO2Adsorbent tank B(2) front pass through connecting tube A(18)
Connection, CO2Adsorbent tank A(1) and CO2Adsorbent tank B(2) the back side pass through connecting tube B(19) connection, CO2Adsorbent tank C(3)
And CO2Adsorbent tank D(4) it is installed on the intermediate bulkhead of rack (17), CO2Adsorbent tank C(3) and CO2Adsorbent tank D(4)
Front passes through connecting tube C(20) connection, CO2Adsorbent tank C(3) and CO2Adsorbent tank D(4) the back side pass through connecting tube D(21)
Connection；
The connecting tube A(18) on install manual ball valve A(6), connecting tube C(20) on install manual ball valve B(7), connecting tube B
(19) on install manual ball valve C(5), connecting tube D(21) on install manual ball valve D(8), for connecting connecting tube A(18) and even
Adapter tube C(20) threeway also connect with conduit A(22), conduit A(22) on install blower (9), for connecting connecting tube B(19) and
Connecting tube D(21) threeway also connect with conduit B(23).
2. a kind of gas concentration control system according to claim 1, which is characterized in that the conduit A(22) and target
Container (16) connection, the pipeline between blower (9) and target container (16) are also connected with CO2It supplements gas source (14), CO2Supplement gas
Solenoid valve (12) are installed on source (14), solenoid valve (12) is connected by signal wire and controller (10).
3. a kind of gas concentration control system according to claim 1, which is characterized in that the conduit B(23) and target
Container (16) connection.
4. a kind of gas concentration control system according to claim 1, which is characterized in that the controller (10) and blower
(9) 220V power supply (15) are accessed, controller (10) is connected with blower (9) by signal wire.
5. a kind of gas concentration control system according to claim 1, which is characterized in that the 220V power supply (15) passes through
220V alternating current is transformed into 24V direct current and supplies electricity to CO built in target container (16) by transformer (11)2Sensor (13) and electricity
Magnet valve (12) power supply.
6. a kind of gas concentration control system according to claim 5, which is characterized in that the CO2Sensor (13) passes through
Signal wire is connect with controller (10).
7. a kind of gas concentration control system according to claim 1, which is characterized in that CO2Adsorbent tank A(1) and CO2
Adsorbent tank B(2) it is A group adsorption system, CO2Adsorbent tank C(3) and CO2Adsorbent tank D(4) be B group adsorption system, two groups
Backup mutually.
8. a kind of gas concentration control method according to claim 1-7, including obtain low carbon dioxide environment
With acquisition two steps of high carbon dioxide environment, which is characterized in that two steps are specific as follows:
A, experiment purpose is when needing to obtain low carbon dioxide environment
A1: when the running of A group adsorption system, manual ball valve C(5 is opened manually) and manual ball valve A(6), close manual ball
Valve B(7) and manual ball valve D(8), B group adsorption system stops working；
A2: when the adsorbent saturation of A group adsorption system needs replacing adsorbent, manual ball valve C(5 is turned off manually) and hand
Dynamic ball valve A(6), stop the work of A group adsorption system, while manually opened No. 7 and No. 8 ball valves, the adsorption system of B group are begun to
Running；
B, experiment purpose is when needing to obtain high carbon dioxide environment
B1: carbon dioxide existing concentration PV value and the titanium dioxide for needing to set in controller (10) displaying target container (16) cabinet
The concentration SV value of carbon；
B2: when the SV concentration of setting is higher than existing concentration PV, controller (10) can make solenoid valve (12) to solenoid valve (12) power supply
It opens, makes CO2Carbon dioxide gas in supplement gas source (14) is directly entered target container (16) cabinet, makes target container (16)
The gas concentration lwevel of cabinet increases, and when reaching setting concentration, controller (10) can stop powering to solenoid valve (12),
Make its closing, can accurately realize the control of high carbon dioxide concentration in this way.
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| CN201910622470.4A CN110327798A (en) | 2019-07-11 | 2019-07-11 | A kind of gas concentration control system and method |
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| CN201910622470.4A CN110327798A (en) | 2019-07-11 | 2019-07-11 | A kind of gas concentration control system and method |
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| CN208609514U (en) * | 2018-05-29 | 2019-03-19 | 深圳市国仁生态农业科技有限公司 | A kind of gas concentration lwevel adjustable control indicator |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2566935Y (en) * | 2002-08-18 | 2003-08-20 | 苏州市赛普空气分离器技术有限公司 | Modular structure of pressure changing adsorbent air separator |
| CN101954234A (en) * | 2009-07-15 | 2011-01-26 | 中国船舶重工集团公司第七一八研究所 | Carbon dioxide removing machine with double absorbent beds |
| CN203699913U (en) * | 2013-11-19 | 2014-07-09 | 煤科集团沈阳研究院有限公司 | Mobile carbon molecular sieve nitrogen-making device in underground coal mine |
| CN207100367U (en) * | 2016-11-01 | 2018-03-16 | 北京福瑞通科技有限公司 | A kind of air-conditioned cold store removes machine with CO2 |
| CN208609514U (en) * | 2018-05-29 | 2019-03-19 | 深圳市国仁生态农业科技有限公司 | A kind of gas concentration lwevel adjustable control indicator |
| CN208378425U (en) * | 2018-06-14 | 2019-01-15 | 河北捷创能源科技有限公司 | A kind of four tower nitrogen-making devices |
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Application publication date: 20191015 |