CN108310904A - PID control automatically adjusts the petroleum vapor recovery unit and oil-gas recovery method of adsorptive pressure, desorption pressure - Google Patents
PID control automatically adjusts the petroleum vapor recovery unit and oil-gas recovery method of adsorptive pressure, desorption pressure Download PDFInfo
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- CN108310904A CN108310904A CN201810211772.8A CN201810211772A CN108310904A CN 108310904 A CN108310904 A CN 108310904A CN 201810211772 A CN201810211772 A CN 201810211772A CN 108310904 A CN108310904 A CN 108310904A
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40003—Methods relating to valve switching
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a kind of PID controls to automatically adjust adsorptive pressure,The petroleum vapor recovery unit and oil-gas recovery method of desorption pressure,Belong to Investigation of Petroleum Vapor Recovery Technology,Existing gas recovery system for oil is difficult to sufficiently achieve absorption to greatest extent,The ability of desorption,The present invention realizes PID automatic adjustments using proportioning valve as executing agency,Proportioning valve is controlled by PLC controller,The pressure sensor of detection canister internal pressure is connected in PLC controller,The pressure that PLC controller is detected according to pressure sensor,And the aperture of proportioning valve is automatically adjusted with PID to meet the pressure needed for canister,So that pressure oscillation is no more than ± 2KPa,And pressure needed for setting can be realized according to technological requirement and reaches constant,The final technological requirement that can more reach adsorption/desorption,Allow oil gas that recycling is fully desorbed,And the discharge gas after adsorbing is far below the emission request of national regulation.
Description
Technical field
The invention belongs to Investigation of Petroleum Vapor Recovery Technology, and in particular to a kind of PID control automatic adjustment adsorptive pressure, desorption pressure
Petroleum vapor recovery unit and oil-gas recovery method.
Background technology
In order not to make the oil gas of volatilization arbitrarily discharge when oil delivery, according to the environmental requirement in China, oil gas must be collected
Processing recycling.Existing oil gas collection handles recovery system（Unit）In exhaust-valve be switching value valve, adjusting control precision is not
Height, gas recovery system for oil are difficult to sufficiently achieve the ability of adsorption and desorption to greatest extent.
Invention content
The technical problem to be solved in the present invention and the technical assignment of proposition are that existing gas recovery system for oil is overcome to be difficult to maximum
The defect for sufficiently achieving adsorption and desorption ability of limit provides a kind of PID control automatic adjustment adsorptive pressure, desorption pressure
Petroleum vapor recovery unit and oil-gas recovery method.
In order to achieve the above objectives, the petroleum vapor recovery machine of PID control of the invention automatic adjustment adsorptive pressure, desorption pressure
Group, including sequentially connected air-introduced machine, oil gas cooler bin, petroleum vapor recovery tank, it is characterized in that：Described petroleum vapor recovery unit is also
Including the first canister, the second canister, the first three-way magnetic valve, the second three-way magnetic valve, vacuum pump, PLC controller, described first
One interface of three-way magnetic valve is connected to the outlet of the oil gas cooler bin, another two interface is separately connected described first
One interface of canister, the second canister, second three-way magnetic valve connects the input end of the vacuum pump, another two interface point
Not connecting first canister, the second canister, the outlet end of the vacuum pump connects the input end of the air-introduced machine, and described the
The first PID ratio adjusting valves are connected on one canister, connect the 2nd PID ratio adjusting valves on second canister, described first
PID ratio adjusting valves, the 2nd PID ratio adjusting valves are controlled by the PLC controller and realize to the first PID ratio tune
The PID control of valve, the 2nd PID ratio adjusting valves is saved to automatically adjust adsorptive pressure, the desorption of first canister, the second canister
Pressure.
Optimization technique means as petroleum vapor recovery unit of the present invention：PID control automatically adjusts adsorptive pressure, desorption pressure
Petroleum vapor recovery unit, it is characterized in that：The first blow down valve is connected on first canister, connecting second on second canister blows
Sweep valve.
Optimization technique means as petroleum vapor recovery unit of the present invention：It is connected with described in detection in the PLC controller
The first pressure sensor of first canister internal pressure, the second pressure sensor of detection the second canister internal pressure.
Optimization technique means as petroleum vapor recovery unit of the present invention：It is respectively arranged in first canister, the second canister
Oil gas absorption activated carbon.
Optimization technique means as petroleum vapor recovery unit of the present invention：The PLC controller, the first PID proportion adjustments
The drive module of valve, the drive module of the 2nd PID ratio adjusting valves are both connected on 2P air switches, the PLC controller
Pass through the drive module of the first PID ratio adjusting valves described in RS485 communication control, the driving mould of the 2nd PID ratio adjusting valves
Block.
In order to achieve the above objectives, the petroleum vapor recovery side of PID control of the invention automatic adjustment adsorptive pressure, desorption pressure
Method, it is characterized in that：
Live oil gas is extracted with air-introduced machine, by oil gas cooler bin cooling liquid, oil-gas storage after liquefaction to petroleum vapor recovery tank；
The oil gas not being recovered by cooling liquid flows to the first canister through the first three-way magnetic valve and is adsorbed, and opens simultaneously
Two blow down valves simultaneously carry out suction desorption by second the second canister of three-way magnetic valve pair by vacuum pump and are sent into air inducing by pipeline
Machine front end carries out circulation and stress processing；
First canister is adsorbed, the second canister automatically switches adsorption and desorption after carrying out suction desorption setting time, that is, is passed through
The oil gas that supercooling liquefaction is not recovered flows to the second canister through the first three-way magnetic valve and is adsorbed, and opens simultaneously the first purging
Valve simultaneously carries out suction desorption by second the first canister of three-way magnetic valve pair by vacuum pump and is sent into air-introduced machine front end by pipeline
Carry out circulation and stress processing；
The oil gas not being recovered by cooling liquid so alternately flows to the first canister, the second canister carries out adsorption and desorption, and
First canister implements the second canister when the second canister when absorption implements desorption, the first canister implementation desorption and implements absorption；
PID control is carried out to automatically adjust the adsorption pressure of the first canister with the first PID ratio adjusting valves of PLC controller pair therebetween
Power, desorption pressure, the 2nd PID ratio adjusting valves of PLC controller pair carry out PID control to automatically adjust the adsorption pressure of the second canister
Power, desorption pressure.
Optimization technique means as oil-gas recovery method of the present invention：The oil gas not being recovered by cooling liquid is first
Canister, the second canister are at least 40 minutes by the setting time of adsorption and desorption.
Optimization technique means as oil-gas recovery method of the present invention：It is opened by the automatic adjustment of the first PID ratio adjusting valves
The adsorptive pressure of first canister is maintained at 0KPa by degree, and aperture is automatically adjusted by the second canister by the 2nd PID ratio adjusting valves
Adsorptive pressure be maintained at 0KPa.
Optimization technique means as oil-gas recovery method of the present invention：It is opened by the automatic adjustment of the first PID ratio adjusting valves
The desorption pressure of first canister is maintained at -95KPa by degree, and aperture is automatically adjusted by the second carbon by the 2nd PID ratio adjusting valves
The desorption pressure of tank is maintained at -95KPa.
Optimization technique means as oil-gas recovery method of the present invention：The PLC controller is according to the first carbon detected
The internal pressure of tank controls the first PID ratio adjusting valves automatic adjustment aperture to adjust the internal pressure of the first canister, the PLC
Controller according to the internal pressure of the second canister detected controls the 2nd PID ratio adjusting valves automatic adjustment aperture to adjust the
The internal pressure of two canisters.
The present invention realizes the adjusting of canister internal pressure automatically by using ratio adjusting valve cooperation PID control technology,
And ratio adjusting valve performance compared with switching value valve is more notable：
1. can be with smooth adjustment any angle, and with angle feed-back function, realize high-precision control；
2. in automatic control, better controlling opening of valve is adjusted by PID self studies, meets required pressure in tank, canister is allowed to fill
Divide and adsorbed or be desorbed under different process pressure, more effectively oil gas is recycled, and exhaust is made to reach national environmental protection
Emission request.
So that canister pressure fluctuating in inner is less than ± 2KPa, and pressure needed for setting can be realized according to technological requirement and is reached
It is constant, it finally can more reach the technological requirement of adsorption/desorption, allow oil gas that recycling is fully desorbed, and the discharge gas after absorption is far low
In the emission request of national regulation.
Description of the drawings
Fig. 1 is the systematic schematic diagram of petroleum vapor recovery unit of the present invention；
Fig. 2 is the PLC controller of the present invention, the control schematic diagram of PID ratio adjusting valves, pressure sensor；
Figure label explanation：
The first PID ratio adjusting valves of 1-, the 2nd PID ratio adjusting valves of 2-, the first canisters of 3-, the second canisters of 4-, 5- vacuum pumps, 6-
Air-introduced machine, the first three-way magnetic valves of 7-, the second three-way magnetic valves of 8-, the first blow down valves of 9-, the second blow down valves of 10-, 11- oil gas are cold
But case, 12- petroleum vapor recovery tanks；
13-PLC controllers, 14- first pressure sensors, 15- second pressure sensors, 16-2P air switches, the first PID of 17-
Ratio adjusting valve drive module, the 2nd PID ratio adjusting valve drive modules of 18-.
Specific implementation mode
Below in conjunction with Figure of description, the present invention will be further described.
As shown in Figure 1, the petroleum vapor recovery unit of PID control automatic adjustment adsorptive pressure, desorption pressure, including connect successively
Air-introduced machine 6, oil gas cooler bin 11, the petroleum vapor recovery tank 12 connect, the petroleum vapor recovery unit further include the first canister 3, the second canister
4, the first three-way magnetic valve 7, the second three-way magnetic valve 8, vacuum pump 5, PLC controller 12, one of the first three-way magnetic valve 7 connect
Mouth is connected to the outlet of oil gas cooler bin 11, another two interface is separately connected the first canister 3, the second canister 4, the second threeway electromagnetism
Input end, the another two interface of the interface connection vacuum pump 5 of valve 8 are separately connected the first canister 3, the second canister 4, vacuum pump
5 outlet end connects the input end of air-introduced machine 6, and the first PID ratio adjusting valves 1 are connected on the first canister 3, are connected on the second canister 4
The 2nd PID ratio adjusting valves 2 are connect, the first PID ratio adjusting valves 1, the 2nd PID ratio adjusting valves 2 are controlled by PLC controller 13
Realize the PID control to the first PID ratio adjusting valves, the 2nd PID ratio adjusting valves to automatically adjust the first canister, the second canister
Adsorptive pressure, desorption pressure.
The first blow down valve 9 is connected on first canister 3, and the second blow down valve 10 is connected on the second canister 4.
First pressure sensor 14, the detection described the of the first canister internal pressure of detection are connected in PLC controller 13
The second pressure sensor 15 of two canister internal pressures.
It is respectively arranged with oil gas absorption activated carbon in first canister 3, the second canister 4.
As shown in Fig. 2, PLC controller 13, the drive module 17 of the first PID ratio adjusting valves, the 2nd PID ratio adjusting valves
Drive module 18 be both connected on 2P air switches 16, PLC controller 13 passes through the first PID ratio tune of RS485 communication control
Save drive module 17, the drive module 18 of the 2nd PID ratio adjusting valves of valve.
The executing agency of PID ratio adjusting valves uses AC220V motor, and is controlled by the drive module built in proportioning valve,
The drive module is controlled in PLC controller.
In view of above-mentioned petroleum vapor recovery unit, it can realize that PID control automatically adjusts adsorptive pressure, desorption is pressed by operations described below
The oil-gas recovery method of power：
Live oil gas is by air-introduced machine intake line, and while air-introduced machine 6 is opened, the first three-way magnetic valve 7 is opened to the first canister
3, the first blow down valve 9 is closed, and the first canister 3 automatically adjusts aperture by the first PID ratio adjusting valves 1 and keeps 0 KPa（Relative to
Atmospheric pressure）, into absorbing process flow；On the other hand, starting vacuum pump 5, the second three-way magnetic valve 8 is opened to the second canister 4, the
Two blow down valves 10 are opened, and the second canister 4 automatically adjusts aperture holding -95KPa by the 2nd PID ratio adjusting valves 2（Relative to big
Air pressure）, after carrying out suction desorption by vacuum pump 5, air-introduced machine front end is sent by pipeline and carries out circulation and stress processing.
After 40min, two technological process switchings of adsorption and desorption enter oil gas after the completion of oil gas absorption and are desorbed, oil gas is de-
Enter oil gas after the completion of attached to adsorb, so move in circles.It thus realizes the recycling for completing oil gas, while reaching national environmental protection row
Put requirement.
Two PID ratio adjusting valves are automatic adjustment executing agency, and drive module built in the PID ratio adjusting valves is used for
Processing executes PID and automatically adjusts information, to drive PID ratio adjusting valves.And drive module built in the PID ratio adjusting valves by
It controls in PLC controller.
In view of above-mentioned petroleum vapor recovery unit and operation, PID control automatically adjusts the petroleum vapor recovery of adsorptive pressure, desorption pressure
Method is：
Live oil gas is extracted with air-introduced machine 6, by 11 cooling liquid of oil gas cooler bin, oil-gas storage after liquefaction to petroleum vapor recovery
Tank 12；
The oil gas not being recovered by cooling liquid flows to the first canister 3 through the first three-way magnetic valve 7 and is adsorbed, and opens simultaneously
Second blow down valve 10 is simultaneously carried out suction desorption to the second canister 4 by the second three-way magnetic valve 8 by vacuum pump 5 and is sent by pipeline
Enter 6 front end of air-introduced machine and carries out circulation and stress processing；
First canister is adsorbed, the second canister automatically switches adsorption and desorption after carrying out suction desorption setting time, i.e., through supercooling
But the oil gas not being recovered that liquefies flows to the second canister 4 through the first three-way magnetic valve 7 and is adsorbed, and opens simultaneously the first blow down valve
9 and by vacuum pump 5 by the second three-way magnetic valve 8 to the first canister 3 carry out suction desorption and by pipeline be sent into air-introduced machine 6 before
End carries out circulation and stress processing；It is by the first three-way magnetic valve of PLC controller pair, the second threeway to automatically switch adsorption and desorption
The control of solenoid valve, the first blow down valve, the second blow down valve is realized；Wherein, when being adsorbed, the first three-way magnetic valve is connected to oil gas
Cooler bin and corresponding canister, when being desorbed, the second three-way magnetic valve is connected to vacuum pump and corresponding canister；
The oil gas not being recovered by cooling liquid so alternately flows to the first canister, the second canister carries out adsorption and desorption, and
First canister implements the second canister when the second canister when absorption implements desorption, the first canister implementation desorption and implements absorption；
PID control is carried out to automatically adjust the adsorption pressure of the first canister with the first PID ratio adjusting valves of PLC controller pair therebetween
Power, desorption pressure, the 2nd PID ratio adjusting valves of PLC controller pair carry out PID control to automatically adjust the adsorption pressure of the second canister
Power, desorption pressure.
Wherein：The oil gas not being recovered by cooling liquid the first canister, the second canister by adsorption and desorption setting when
Between be at least 40 minutes（The setting time can be set by PLC controller）.It is automatically adjusted by the first PID ratio adjusting valves
The adsorptive pressure of first canister is maintained at 0KPa by aperture, and aperture is automatically adjusted by the second carbon by the 2nd PID ratio adjusting valves
The adsorptive pressure of tank is maintained at 0KPa.Aperture is automatically adjusted by the desorption pressure of the first canister by the first PID ratio adjusting valves
Be maintained at -95KPa, by the 2nd PID ratio adjusting valves automatically adjust aperture the desorption pressure of the second canister is maintained at -
95KPa.PLC controller controls the automatic adjustment of the first PID ratio adjusting valves according to the internal pressure of the first canister detected and opens
It spends to adjust the internal pressure of the first canister, PLC controller controls the 2nd PID according to the internal pressure of the second canister detected
Ratio adjusting valve automatically adjusts aperture to adjust the internal pressure of the second canister.
PLC controller is according to carbon pressure inside the tank setting value（Pressure value needed for technological requirement：Adsorb 0KPa；Desorption -95KPa,
The setting value is set by PLC controller）With actual pressure in the canister of feedback（The pressure value of canister pressure sensor detection）,
The desired value that canister pressure set points are adjusted as PID in this way, input feedback value of the canister actual pressure value as PID, target
The deviation of value and value of feedback constantly adjusts, calculates the output valve of PID using PID programs, to which output valve carrys out Control PID ratio
The aperture of example regulating valve, constantly self adjusts desired value in this way, finally tends to constant.Thereby realize a set of automatic adjustment carbon
The closed-loop system of pressure tank.Realization meets pressure needed for two techniques of adsorption and desorption and reaches constant, finally more preferably reaches absorption
The technological requirement of desorption allows oil gas that recycling is fully desorbed, and the discharge gas after absorption is far below the emission request of national regulation.
The above, preferable specific implementation mode only of the invention, but the scope of the present invention is not limited thereto, and it is any
Those familiar with the art in the technical scope of present disclosure, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore the scope of the present invention is subject to the scope of protection of the claims.
Claims (10)
- The petroleum vapor recovery unit of 1.PID control automatic adjustments adsorptive pressure, desorption pressure, including sequentially connected air-introduced machine（6）、 Oil gas cooler bin（11）, petroleum vapor recovery tank（12）, it is characterized in that：Described petroleum vapor recovery unit further includes the first canister（3）、 Second canister（4）, the first three-way magnetic valve（7）, the second three-way magnetic valve（8）, vacuum pump（5）, PLC controller（13）, described First three-way magnetic valve（7）An interface be connected to the oil gas cooler bin（11）Outlet, another two interface connects respectively Connect first canister（3）, the second canister（4）, second three-way magnetic valve（8）An interface connect the vacuum pump （5）Input end, another two interface be separately connected first canister（3）, the second canister（4）, the vacuum pump（5）Go out Mouth end connects the air-introduced machine（6）Input end, first canister（3）The first PID ratio adjusting valves of upper connection（1）, described Second canister（4）The 2nd PID ratio adjusting valves of upper connection（2）, the first PID ratio adjusting valves（1）, the 2nd PID ratios Regulating valve（2）It is controlled by the PLC controller（13）It realizes to the first PID ratio adjusting valves, the 2nd PID ratio tune The PID control of valve is saved to automatically adjust first canister, the adsorptive pressure of the second canister, desorption pressure.
- 2. the petroleum vapor recovery unit of PID control automatic adjustment adsorptive pressure according to claim 1, desorption pressure, special Sign is：First canister（3）The first blow down valve of upper connection（9）, second canister（4）The second blow down valve of upper connection（10）.
- 3. the petroleum vapor recovery unit of PID control automatic adjustment adsorptive pressure according to claim 1, desorption pressure, special Sign is：The PLC controller（13）On be connected with the first pressure sensor for detecting the first canister internal pressure（14）、 Detect the second pressure sensor of the second canister internal pressure（15）.
- 4. the petroleum vapor recovery unit of PID control automatic adjustment adsorptive pressure according to claim 1, desorption pressure, special Sign is：It is respectively arranged with oil gas absorption activated carbon in first canister, the second canister.
- 5. the petroleum vapor recovery unit of PID control automatic adjustment adsorptive pressure according to claim 1, desorption pressure, special Sign is：The PLC controller（13）, the first PID ratio adjusting valves drive module（17）, the 2nd PID ratio adjusting valve Drive module（18）It is both connected to 2P air switches（16）On, the PLC controller（13）Described in RS485 communication control The first PID ratio adjusting valves drive module（17）, the 2nd PID ratio adjusting valves drive module（18）.
- The oil-gas recovery method of 6.PID control automatic adjustments adsorptive pressure, desorption pressure, it is characterized in that：Use air-introduced machine（6）Live oil gas is extracted, by oil gas cooler bin（11）Cooling liquid, oil-gas storage after liquefaction to oil gas Recycling can（12）；The oil gas not being recovered by cooling liquid is through the first three-way magnetic valve（7）Flow to the first canister（3）It is adsorbed, simultaneously Open the second blow down valve（10）And by vacuum pump（5）Pass through the second three-way magnetic valve（8）To the second canister（4）Carry out suction desorption And air-introduced machine is sent by pipeline（6）Front end carries out circulation and stress processing；First canister is adsorbed, the second canister automatically switches adsorption and desorption after carrying out suction desorption setting time, that is, is passed through The oil gas that supercooling liquefaction is not recovered is through the first three-way magnetic valve（7）Flow to the second canister（4）It is adsorbed, opens simultaneously One blow down valve（9）And by vacuum pump（5）Pass through the second three-way magnetic valve（8）To the first canister（3）It carries out suction desorption and passes through Pipeline is sent into air-introduced machine（6）Front end carries out circulation and stress processing；The oil gas not being recovered by cooling liquid so alternately flows to the first canister, the second canister carries out adsorption and desorption, and First canister implements the second canister when the second canister when absorption implements desorption, the first canister implementation desorption and implements absorption；PLC controller is used therebetween（13）To the first PID ratio adjusting valves（1）PID control is carried out to automatically adjust the first canister Adsorptive pressure, desorption pressure, PLC controller（13）To the 2nd PID ratio adjusting valves（2）PID control is carried out to automatically adjust the Adsorptive pressure, the desorption pressure of two canisters.
- 7. the oil-gas recovery method of PID control automatic adjustment adsorptive pressure according to claim 6, desorption pressure, special Sign is：The oil gas not being recovered by cooling liquid the first canister, the second canister by the setting time of adsorption and desorption be to It is 40 minutes few.
- 8. the oil-gas recovery method of PID control automatic adjustment adsorptive pressure according to claim 6, desorption pressure, special Sign is：Aperture is automatically adjusted by the first PID ratio adjusting valves, the adsorptive pressure of the first canister is maintained at 0KPa, pass through second The adsorptive pressure of second canister is maintained at 0KPa by PID ratio adjusting valves automatic adjustment aperture.
- 9. the oil-gas recovery method of PID control automatic adjustment adsorptive pressure according to claim 6, desorption pressure, special Sign is：Aperture is automatically adjusted by the first PID ratio adjusting valves, the desorption pressure of the first canister is maintained at -95KPa, by the The desorption pressure of second canister is maintained at -95KPa by two PID ratio adjusting valves automatic adjustment aperture.
- 10. the oil-gas recovery method of PID control automatic adjustment adsorptive pressure according to claim 6, desorption pressure, special Sign is：The PLC controller controls the automatic adjustment of the first PID ratio adjusting valves according to the internal pressure of the first canister detected Aperture adjusts the internal pressure of the first canister, internal pressure control of the PLC controller according to the second canister detected 2nd PID ratio adjusting valves automatically adjust aperture to adjust the internal pressure of the second canister.
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| CN201810211772.8A CN108310904A (en) | 2018-03-15 | 2018-03-15 | PID control automatically adjusts the petroleum vapor recovery unit and oil-gas recovery method of adsorptive pressure, desorption pressure |
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| CN110559746A (en) * | 2019-09-04 | 2019-12-13 | 北京国科环宇科技股份有限公司 | Waste gas recovery experiment system and implementation method |
| CN112624025A (en) * | 2020-11-27 | 2021-04-09 | 广东申菱环境系统股份有限公司 | Oil gas treatment system of gas station and treatment method thereof |
| DE102022114483A1 (en) | 2022-06-09 | 2023-12-14 | Bauer Kompressoren Gmbh | Pressure swing adsorber for continuous drying of gases |
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