# US 5,701,683 A · Counter flow cooler

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- Number: US 5,701,683 A
- Document ID: US5701683A
- Status: Granted
- Kind: A
- Application number: 08/748,588
- Filed: 1996-11-13
- Granted: 1997-12-30
- Earliest claimed: 1996-07-22
- Assignees: California Pellet Mill Company
- Inventors: Donald M. Wilhelm
- Web page: https://patentgrep.com/patent/US5701683A

## CPC

- F26B 25/002: {for bulk goods}
- F26B 17/14: the materials moving through a counter-current of gas
- F26B: DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM (drying devices for combines A01D41/133; racks for drying fruit or vegetables A01F25/12; drying foodstuffs A23; drying hair A45D20/00; body-drying implements A47K10/00; drying household articles A47L; drying gases or vapours B01D; chemical or physical processes for dewatering or like separating liquids from solids B01D43/00; centrifugal apparatus B04; drying ceramics C04B33/30; drying yarns or fabrics in association with some other form of treatment D06C; drying frames for laundry without heating or positive air circulation, domestic laundry-or spin-driers, wringing or hot pressing laundry D06F; furnaces, kilns, ovens F27)

## Abstract

A counter flow cooler in which feed material is fed into the top inlet of the cooler and dispersed into a plurality of cooling chambers. At the bottom of each cooling chamber is a discharge grid which will discharge feed material uniformly over the area of the cooling chamber. The discharge rate of this discharge grid can be adjusted to the desired throughput of the cooler. Air is drawn through the bottom of the discharge grid and passes up through the feed material in a counter flow manner. That is, while the product is passing down through the cooler, the air is passing up through the feed material, carrying away heat and possibly. A feed controller is used to selectively direct feed material into the plurality of cooling chambers. When a second batch of feed material is to be introduced into the cooler, feed material to the first cooling chamber is stopped and all the feed material is directed into the second cooling chamber. When the first cooling chamber is empty, its discharge is closed and the new feed material is directed into the first cooling chamber and feed material to the second cooling chamber is stopped. When the second cooling chamber is empty, the new feed material can be directed into the second cooling chamber and discharge of the new feed material from the first cooling chamber can begin.

## Claims

### Claim 1

A method of cooling feed material in a counter flow cooler, the cooler including at least two cooling chambers, the method comprising:
admitting a supply of a first feed material into the cooling chambers;
passing cooling air through the cooling chambers;
discharging cooled first feed material from the cooling chambers;
stopping the admission of the first feed material into a first one of the cooling chambers;
continuing to discharge first feed material from the cooling chambers until the first cooling chamber is empty of the first feed material, then stopping the admission of first feed material into a second one of the cooling chambers, admitting a second feed material into the first cooling chamber and preventing the discharge of the second feed material from the first cooling chamber until all the cooling chambers are empty of first feed material;
after the second cooling chamber is empty of first feed material, admitting the second feed material into the second cooling chamber.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
after the second cooling chamber is empty of first feed material, stopping the admission of second feed material into the first cooling chamber.

### Claim 3 (depends on 2)

The method according to claim 2, further comprising:
when the first and second cooling chambers each contain a first predetermined quantity of second feed material, admitting the second feed material into the first and second cooling chambers.

### Claim 4 (depends on 1)

The method according to claim 1 wherein the number of cooling chambers is two and further comprising:
after the second cooling chamber is empty of first feed material, discharging the second feed material only from the first cooling chamber; and
when the first and second cooling chambers each contain first and second predetermined quantities of second feed material, discharging cooled second feed materials from the first and second cooling chambers.

### Claim 5 (depends on 4)

The method according to claim 4, further comprising:
after the second cooling chamber is empty of first feed material, delaying the discharge of second material from the first cooling chamber for a predetermined time.

### Claim 6 (depends on 1)

The method according to claim 1 wherein the number of cooling chambers is three and further comprising:
after the second cooling chamber is empty of first feed material, stopping the admission of first feed material into a third one of the cooling chambers;
after the third cooling chamber is empty of first feed material, admitting the second feed material into the third cooling chamber; and
after the first, second and third cooling chambers each contain first, second and third predetermined quantities of second feed material, admitting the second feed material into the first, second and third cooling chambers and discharging cooled second feed material from the first, second and third cooling chambers.

### Claim 7 (depends on 6)

The method according to claim 6, further comprising:
after the third cooling chamber is empty of first feed material, stopping admission of second material into the first and second cooling chambers.

### Claim 8 (depends on 1)

The method according to claim 1 wherein the number of cooling chambers is four and further comprising:
after the second cooling chamber is empty of first feed material, stopping the admission of first feed material into a third one of the cooling chambers;
after the third cooling chamber is empty of first feed material, admitting the second feed material into the third cooling chamber;
after the third cooling chamber is empty of first feed material, stopping the admission of first feed material into a fourth one of the cooling chambers;
after the first, second and third cooling chambers each contain first, second and third predetermined quantities of second feed material, admitting the second feed material into the first, second and third cooling chambers and discharging cooled second feed material from the first, second and third cooling chambers;
after the fourth cooling chamber is empty of first feed material, admitting the second feed material into the fourth cooling chamber; and
after the first, second, third and fourth cooling chambers each contain fourth, fifth, sixth and seventh predetermined quantities of second feed material, admitting the second feed material into the first, second, third and fourth cooling chambers and discharging cooled second feed material from the first, second, third and fourth cooling chambers.

### Claim 9 (depends on 8)

The method according to claim 8, further comprising:
after the third cooling chamber is empty of first feed material, stopping admission of second material into the first and second cooling chambers.

### Claim 10 (depends on 8)

The method according to claim 8, further comprising:
after the fourth cooling chamber is empty of first feed material, stopping admission of second material into the first, second and third cooling chambers.

### Claim 11 (depends on 1)

The method according to claim 1, further comprising:
individually controlling the air flow through each of the cooling chambers.

### Claim 12 (depends on 1)

The method according to claim 1, further comprising:
prior to the step of admitting the second feed material into the first cooling chamber, sealing the first cooling chamber from the second cooling chamber.

### Claim 13 (depends on 1)

The method according to claim 1, further comprising:
after the step of stopping admission of first feed material into the first cooling chamber, increasing the rate of discharge of first feed material from the second cooling chamber.

### Claim 14 (depends on 1)

The method according to claim 1, further comprising:
modulating the rate at which first feed material is admitted into the cooling chambers to maintain equal quantities of first feed material in each cooling chamber.

### Claim 15 (depends on 1)

The method according to claim 1, further comprising:
modulating the rate at which second feed material is admitted into the cooling chambers to maintain equal quantities of second feed material in each cooling chamber.