US5807422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Divided radial and spherical desiccant bed adsorption units
Assignee: Individual
•
Filing: 1997-04-08
•
Granted: 1998-09-15
•
Expires: 2017-04-08
Abstract
Abstract A pre-compression dehydration system optimizes the gas flow parameters which are essential to the performance of a radial or spherical desiccant dryer. When used in conjunction with a low pressure dryer, the system protects the desiccant bed from channeling, which can cause the gas to flow unevenly through the desiccant bed and fail to make effective contact with the desiccant. The system provides a multiple zone, or divided, desiccant bed adsorption unit to maintain a proper flow distribution as required by the demand of the air compressor and to eliminate the potential for channeling. The system may also include a controller for automatically opening and closing the port access doors of the adsorption unit to control the amount of desiccant utilized to dry the air. A thermostatically controlled precooler may be provided for cooling the ambient air prior to adsorption to insure that the temperature of the effluent air will not exceed 100° F. (37.8° C.) as a result of the heat energy produced during the adsorption process. A heater may be provided within the desiccant bed to improve the rate of heat transfer to the desiccant media during the regeneration phase.
Inventors
- 👤 George R. Grgich
- 👤 Michael S. Cranford
- 👤 John C. Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:24
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/261; B01D53/02; B01D53/04; B01D53/0454; B01D2251/00; B01D2251/30; B01D2251/302; B01D2251/60; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/116; B01D2253/30; B01D2253/34; B01D2257/00; B01D2257/80; B01D2259/00; B01D2259/40; B01D2259/40007; B01D2259/40009; B01D2259/40083; B01D2259/40088; B01D2259/4009; B01D2259/402; B01D53/0407; B01D53/0431; B01D53/0446
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
138 words
A method of drying atmospheric gas passing through a desiccant media of a first divided desiccant bed adsorption unit prior to providing the gas having a lowered dewpoint to an inlet valve of a gas compressor while regenerating a spent desiccant media in a second divided desiccant bed adsorption unit, the method comprising the steps of providing a first pre-compression divided desiccant bed adsorption unit and a second pre-compression divided desiccant bed adsorption unit; drawing substantially atmospheric gas through the desiccant media of the first pre-compression divided desiccant bed absorption unit; conveying the dried substantially atmospheric gas from the first pre-compression divided desiccant bed adsorption unit through a gas discharge conduit to the inlet valve of the gas compressor; and drawing heated substantially atmospheric gas through the desiccant media of the second pre-compression divided desiccant bed adsorption unit.
Claim 2
Independent Claim
138 words
A method of drying atmospheric gas passing through a desiccant media of a first divided desiccant bed adsorption unit prior to providing the gas having a lowered dewpoint to an inlet valve of a gas compressor while regenerating a spent desiccant media in a second divided desiccant bed adsorption unit, the method comprising the steps of providing a first pre-compression divided desiccant bed adsorption unit and a second pre-compression divided desiccant bed adsorption unit; drawing substantially atmospheric gas through the desiccant media of the first pre-compression divided desiccant bed absorption unit; conveying the dried substantially atmospheric gas from the first pre-compression divided desiccant bed adsorption unit through a gas discharge conduit to the inlet valve of the gas compressor; and drawing heated substantially atmospheric gas through the desiccant media of the second pre-compression divided desiccant bed adsorption unit.
Claim 3
Independent Claim
124 words
A method of drying atmospheric gas passing through a desiccant media of a divided desiccant bed adsorption unit prior to providing the gas having a lowered dewpoint to an inlet valve of a gas compressor, the method comprising the steps of providing a first pre-compression divided desiccant bed adsorption unit having a first zone of the desiccant media and a second zone of the desiccant media; drawing substantially atmospheric gas through the desiccant media of at least one of the first zone and the second zone of the first pre-compression divided desiccant bed adsorption unit; and conveying the dried substantially atmospheric gas from the first pre-compression divided desiccant bed adsorption unit through a gas discharge conduit to the inlet valve of the gas compressor.
Claim 4
Independent Claim
124 words
A method of drying atmospheric gas passing through a desiccant media of a divided desiccant bed adsorption unit prior to providing the gas having a lowered dewpoint to an inlet valve of a gas compressor, the method comprising the steps of providing a first pre-compression divided desiccant bed adsorption unit having a first zone of the desiccant media and a second zone of the desiccant media; drawing substantially atmospheric gas through the desiccant media of at least one of the first zone and the second zone of the first pre-compression divided desiccant bed adsorption unit; and conveying the dried substantially atmospheric gas from the first pre-compression divided desiccant bed adsorption unit through a gas discharge conduit to the inlet valve of the gas compressor.
Claim 5
Dependent Claim
78 words
A method of drying atmospheric gas according to claim 2 further comprising the steps of providing an inlet door and an exhaust door communicating with each of the first zone and the second zone of the first precompression divided desiccant bed adsorption unit; closing the inlet door of one of the first zone and the second zone of the first pre-compression divided desiccant bed adsorption unit when the demand from the gas compressor falls below a predetermined value.
Claim 6
Dependent Claim
51 words
A method of drying atmospheric gas according to claim 3 further comprising the step of opening the closed inlet door of the one of the first zone and the second zone of the first pre-compression divided desiccant bed adsorption unit when the demand from the gas compressor exceeds the predetermined value.
Claim 7
Dependent Claim
71 words
A method of drying atmospheric gas according to claim 3 further comprising the steps of providing a second pre-compression divided desiccant bed adsorption unit having a first zone of the desiccant media and a second zone of the desiccant media; and drawing heated substantially atmospheric gas through the desiccant media of at least one of the first zone and the second zone of the second pre-compression divided desiccant bed adsorption unit.
Claim 8
Dependent Claim
78 words
A method of drying atmospheric gas according to claim 5 further comprising the steps of providing an inlet door and an exhaust door communicating with each of the first zone and the second zone of the second pre-compression divided desiccant bed adsorption unit; closing the inlet door of one of the first zone and the second zone of the second pre-compression divided desiccant bed adsorption unit when the demand from the gas compressor falls below a predetermined value.
Claim 9
Dependent Claim
51 words
A method of drying atmospheric gas according to claim 6 further comprising the step of opening the closed inlet door of the one of the first zone and the second zone of the second pre-compression divided desiccant bed adsorption unit when the demand from the gas compressor exceeds the predetermined value.
Claim 10
Dependent Claim
97 words
A pre-compression gas-dehydration system comprising a blower; a heater in fluid communication with said blower; a first valve and a second valve each in fluid communication with said heater; a first divided desiccant bed adsorption unit in fluid communication with said first valve; a second divided desiccant bed adsorption unit in fluid communication with said second valve; a dried gas discharge conduit in fluid communication with said first desiccant bed adsorption unit and said second desiccant bed adsorption unit for providing dried substantially atmospheric gas having a lowered dewpoint to an inlet valve of a gas compressor.
Claim 11
Dependent Claim
97 words
A pre-compression gas-dehydration system comprising a blower; a heater in fluid communication with said blower; a first valve and a second valve each in fluid communication with said heater; a first divided desiccant bed adsorption unit in fluid communication with said first valve; a second divided desiccant bed adsorption unit in fluid communication with said second valve; a dried gas discharge conduit in fluid communication with said first desiccant bed adsorption unit and said second desiccant bed adsorption unit for providing dried substantially atmospheric gas having a lowered dewpoint to an inlet valve of a gas compressor.
Claim 12
Dependent Claim
18 words
A pre-compression gas-dehydration system according to claim 8 further comprising a filter in fluid communication with said blower.
Claim 13
Dependent Claim
61 words
A pre-compression gas-dehydration system according to claim 8 further comprising a precooler in fluid communication with said first desiccant bed adsorption unit and said second desiccant bed adsorption unit for providing gas having an inlet temperature that does not exceed a predetermined inlet drybulb and wetbulb temperature to said first desiccant bed adsorption unit and said second desiccant bed adsorption unit.
Claim 14
Dependent Claim
23 words
A pre-compression gas-dehydration system according to claim 10 wherein the predetermined inlet drybulb and wetbulb temperature does not exceed 55° F. (12.7° C.).
Claim 15
Dependent Claim
65 words
A pre-compression gas-dehydration system according to claim 10 wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit is provided with an inlet door and an exhaust door so that one of said first and said second desiccant bed adsorption units is adsorbing moisture while the other of said first and said second desiccant bed adsorption units is regenerating.
Claim 16
Dependent Claim
89 words
A pre-compression gas-dehydration system according to claim 8 wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit comprises a cylindrical, tubular container having a top, a bottom and a continuous side extending between the top and the bottom; a desiccant media positioned within said container between an inner screen and an outer screen, said inner screen defining a hollow center chamber within said container; and a tubular center channel in fluid communication with said center chamber and said dried gas discharge conduit.
Claim 17
Dependent Claim
29 words
A pre-compression gas-dehydration system according to claim 13 wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit is configured for radial flow.
Claim 18
Dependent Claim
79 words
A pre-compression gas-dehydration system according to claim 14 wherein said inner screen and said outer screen are cylindrical so that said desiccant media is annular shaped; and wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit further comprises a solid segment divider that extends between the continuous side of said container and said inner screen thereby forming a first zone and a second zone of said desiccant media positioned within said container.
Claim 19
Dependent Claim
20 words
A pre-compression gas-dehydration system according flow claim 15 wherein said container is provided with at least one sealable inlet port.
Claim 20
Dependent Claim
44 words
A pre-compression gas-dehydration system according to claim 15 wherein the continuous side of said container and said outer screen are spaced apart to form a gap zone between the exterior surface of said annular shaped desiccant media and the continuous side of said container.
Claim 21
Dependent Claim
103 words
A pre-compression gas-dehydration system according to claim 15 wherein each of said first zone and said second zone of each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit is provided with an inlet door and an exhaust door so that said desiccant media of at least one of said first and said second zone of said first and said second desiccant bed adsorption units is adsorbing moisture while said desiccant media of at least one of said first and said second zone of the other of said first and said second desiccant bed adsorption units is regenerating.
Claim 22
Dependent Claim
46 words
A pre-compression gas-dehydration system according to claim 18 further comprising means for controlling the operation of each of said inlet door and said exhaust door of each of said first and said second zone of each of said first and said second desiccant bed adsorption unit.
Claim 23
Dependent Claim
309 words
A pre-compression gas-dehydration system according to claim 19 wherein said means for controlling the operation of each of said inlet door and said exhaust door comprises a computer having a central processor which can be programmed to operate the pre-compression gas-dehydration system automatically; a first solenoid mechanically coupled to said inlet door of said first zone of said first desiccant bed adsorption unit; a second solenoid mechanically coupled to said exhaust door of said first zone of said first desiccant bed adsorption unit; a third solenoid mechanically coupled to said inlet door of said second zone of said first desiccant bed adsorption unit; a fourth solenoid mechanically coupled to said exhaust door of said second zone of said first desiccant bed adsorption unit; a fifth solenoid mechanically coupled to said inlet door of said first zone of said second desiccant bed adsorption unit; a sixth solenoid mechanically coupled to said exhaust door of said first zone of said second desiccant bed adsorption unit; a seventh solenoid mechanically coupled to said inlet door of said second zone of said second desiccant bed adsorption unit; an eighth solenoid mechanically coupled to said exhaust door of said second zone of said second desiccant bed adsorption unit; a first sensor communicating with said first zone of said first desiccant bed adsorption unit and electrically connected to said first solenoid and said second solenoid; and a second sensor communicating with said second zone of said first desiccant bed adsorption unit and electrically connected to said third solenoid and said fourth solenoid; a third sensor communicating with said first zone of said second desiccant bed adsorption unit and electrically connected to said fifth solenoid and said sixth solenoid; and a fourth sensor communicating with said second zone of said second desiccant bed adsorption unit and electrically connected to said seventh solenoid and said eighth solenoid.
Claim 24
Dependent Claim
93 words
A pre-compression gas-dehydration system according to claim 20 wherein said means for controlling comprises a first demand sensor communicating with said second zone of said first desiccant bed adsorption unit for sensing when the demand from the compressor is below a predetermined value, said first demand sensor electrically connected to said second sensor; and a second demand sensor communicating with said second zone of said second desiccant bed adsorption unit for sensing when the demand from the compressor is below a predetermined value, said second demand sensor electrically connected to said fourth sensor.
Claim 25
Dependent Claim
29 words
A pre-compression gas-dehydration system according to claim 13 wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit is configured for spherical flow.
Claim 26
Dependent Claim
79 words
A pre-compression gas-dehydration system according to claim 22 wherein said inner screen and said outer screen are spherical so that said desiccant media is spherical shaped; and wherein each of said first desiccant bed adsorption unit and said second desiccant bed adsorption unit further comprises a solid segment divider that extends between the continuous side of said container and said inner screen thereby forming a first zone and a second zone of said desiccant media positioned within said container.
Claim 27
Dependent Claim
20 words
A pre-compression gas-dehydration system according to claim 23 wherein said container is provided with at least one sealable inlet port.
Claim 28
Dependent Claim
44 words
A pre-compression gas-dehydration system according to claim 23 wherein the continuous side of said container and said outer screen are spaced apart to form a gap zone between the exterior surface of said spherical shaped desiccant media and the continuous side of said container.
Claim 29
Dependent Claim
37 words
A pre-compression gas-dehydration system according to claim 13 wherein said desiccant media is selected from the group consisting of activated aluminum trioxide (Al 2 O 3 ), molecular sieve, silica gel, lithium chloride (LiCl) and combinations thereof.
Claim 30
Dependent Claim
18 words
A pre-compression gas-dehydration system according to claim 13 wherein said desiccant media is aluminum trioxide and silica gel.
Claim 31
Dependent Claim
24 words
A pre-compression gas-dehydration system according to claim 13 further comprising a means for controlling the operation of said first valve and said second valve.
Claim 32
Dependent Claim
94 words
A pre-compression gas-dehydration system according to claim 28 wherein said means for controlling the operation of said first valve and said second valve comprises a computer having a central processor which can be programmed to operate the pre-compression gas-dehydration system automatically; a first solenoid mechanically coupled to said first valve; a second solenoid mechanically coupled to said second valve; a first sensor electrically connected to said first desiccant bed adsorption unit and to said first solenoid; and a second sensor electrically connected to said second desiccant bed adsorption unit and to said second solenoid.
Claim 33
Dependent Claim
22 words
A pre-compression gas-dehydration system according to claim 29 wherein each of said first sensor and said second sensor is a moisture sensor.
Claim 34
Dependent Claim
22 words
A pre-compression gas-dehydration system according to claim 29 wherein each of said first sensor and said second sensor is a temperature sensor.
Claim 35
Dependent Claim
36 words
A pre-compression gas-dehydration system according to claim 13 further comprising a dedicated heater positioned within the center chamber defined by said inner screen to improve the rate of heat transfer to said desiccant media during regeneration.
References Cited (Backward Citations)
US2089776A
Cited
CA483283A
Cited
US772551A
Cited
GB146397A
Cited
US2214737A
Cited
US2303333A
Cited
US2519296A
Cited
US2588296A
Cited
US2633928A
Cited
US2563042A
Cited
US2535902A
Cited
US2624421A
Cited
US2640558A
Cited
US2626675A
Cited
US2699837A
Cited
US2712981A
Cited
US2783547A
Cited
US2801707A
Cited
US2830672A
Cited
US3016978A
Cited
US3034315A
Cited
US3204388A
Cited
US3193985A
Cited
US3091097A
Cited
US3236028A
Cited
US3319347A
Cited
US3226948A
Cited
DE1940156A1
Cited
US3643402A
Cited
DE2126649A1
Cited
US3771661A
Cited
US3850598A
Cited
US3880616A
Cited
US3965724A
Cited
DE2602582A1
Cited
US4237696A
Cited
JPS5579027A
Cited
JPS56152726A
Cited
US4364756A
Cited
US4589892A
Cited
GB2142254A
Cited
US4474661A
Cited
US4863497A
Cited
US4658707A
Cited
US4721515A
Cited
US4826516A
Cited
US4812148A
Cited
US4806134A
Cited
GB2199513A
Cited
US4775484A
Cited
SU1581357A1
Cited
US5037458A
Cited
US5169413A
Cited
US5335426A
Cited
US5378266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |