Method and apparatus for increasing the yield of an air-drying process

• US 5,443,624 A
• Filed: 01/12/1994
• Issued: 08/22/1995
• Est. Priority Date: 08/30/1991
• Status: Expired due to Term

• Current Assignee: Corroventa Avfuktning AB
• Original Assignee: Corroventa Avfuktning AB
• Inventors: Claesson, Knut
• Primary Examiner(s): Bushey, C. Scott
• Application Number:
  US08/175,419
• Time in Patent Office: 587 Days
• Field of Search: 55/269, 55/338, 55/472, 95/39, 95/113, 95/114, 95/123, 95/124, 95/126, 95/288, 95/115, 96/144, 96/150, 96/218
• US Class Current: 95/113
• CPC Class Codes: B01D 53/261 by adsorption
• CPC Class Codes: F24F 2203/1012 Details of the casing or cover
• CPC Class Codes: F24F 2203/1032 Desiccant wheel
• CPC Class Codes: F24F 2203/1068 comprising one rotor
• CPC Class Codes: F24F 2203/1084 comprising two flow rotor segments
• CPC Class Codes: F24F 3/1423 with a moving bed of solid desiccants, e.g. a rotary wheel supporting solid desiccants

Abstract

A method and apparatus for increasing the yield of an air-drying process with the aid of a dehumidifier 2 and a condenser/heat-exchanger 3 involves delivering wet regenerating air exiting the dehumidifier to one side of the condenser/heat-exchanger so as to deliver energy to the process air entering the other side. Condensation deriving from the regenerating air is collected and carried away, and the heated, dried process air 21 is delivered to the dehumidifier in which moisture is extracted from the air and the air further dried. The departing wet regenerating air may, after its delivery process, be led to the room, atmosphere or the flow of process air.

Claims

1. A method of increasing the yield of an air-drying process in which fan-driven process air is delivered to a dehumidifier and there dehumidified and dried during heat-exchange with heated regenerating air, comprising the steps of:

a) delivering relatively moist, heated regenerating air exiting from the dehumidifier to one side of a condenser/heat-exchanger so as to deliver heat to the process air delivered to another side of said condenser/heat-exchanger and to cool the regenerating air;

b) collecting and carrying away condensation obtained from the regenerating air; and

c) delivering the process air heated and relatively dried in the condenser/heat-exchanger to the dehumidifier so as to extract moisture from the process air and further dry said process air.

2. A method according to claim 1, wherein the regenerating air is drawn into the condenser/heat-exchanger with a same fan as that used to draw process air into the dehumidifier.

3. A method according to claim 1, wherein the regenerating air is delivered to room in which air is to be dried, subsequent to subjecting the regenerating air to a heat-exchange and moisture-condensating process.

4. A method according to claim 1, wherein regenerating air is delivered, subsequent to a heat-exchange and moisture-condensating process, to a ventilation system or conducted to a location externally of a room whose air is to be dried.

5. A method according to claim 1, wherein the regenerating air is subjected to a condensing process and then delivered to the flow of process air.

6. A method according to claim 1, wherein exiting moist air is delivered to incoming regenerating air with a separate fan.

7. An air-drying system comprising an air-dehumidifier (2), and including:

a) a housing (4) provided with an inlet (5) and an outlet (6);

b) a rotor (8) journalled in the housing (4) and provided with channels (8a) or beds containing moisture absorbent means;

c) a motor for driving the rotor (8);

d) a fan (10) for pressurizing process air entering through the inlet, so that said air will flow through at least one part of the rotor and, subsequent to being dehumidified, depart through the outlet;

e) means for heating regenerating air which passes through another part of the rotor; and

f) a moist regenerating-air outlet (7);

wherein the system further includes;

g) a condenser/heat-exchanger (3) having lamellar (32) for effecting an exchange of heat between moist regenerating air (29) and incoming process air (21);

h) an outlet for process air exiting from the condenser/heat-exchanger, said outlet adapted to be connected to the inlet of the air-dehumidifier;

i) conduit means (14) for connecting a moist regenerating air-inlet (15) of the condenser/heat-exchanger to the moist regenerating-air outlet (7) of the air-dehumidifier;

j) an outlet (16) for regenerating air which has been subjected to a heat-exchange with said incoming process air;

k) means (18,

     19) for connecting the condenser/heat-exchanger (3) to the air-dehumidifier (2); and

l) means (25) for collecting and carrying away condensation from the condenser/heat-exchanger.

8. A system according to claim 7, wherein the fan (10) is disposed to draw incoming process air (21) through the condenser/heat-exchanger.