Cooler
The Use, Scope of Application and Features
1.1 The Use and Scope of Application
The cooling of granules is an indispensible process of pelletizing section. The temp of granules from pellet mill can be reduced from 70°C——90°C to just 3°C to 5°C higher than the ambient temperature by using reverse-flow cooler, and to the required water moisture(≤12.50℃) for the convenience of pellet transport, storage and reserve.
1.2 Features
As of now, the reverse-flow cooler, as one of the latest coolers prevailing across the globe, avails itself of the counter flow cooling theory to refrigerate granules with high temp and moisture, namely, when vertically passing through the bed of material, the cold air will sweep through cold material. And then the increasingly warm-up air will diffuse together with hot material yet the air direction is opposite to the material flow, hence, granules will be cooled gradually and forwardly lest other coolers directly shock-chill the high-temp material and the surface of granules thereby crazes. Because the cold air goes into the cooler in all direction covering large area and in high-use, therefore, the cooling effect is outstanding. Also, thanks to its low energy consumption and convenient operation, this type of cooler precedes over even updated vertical and horizontal types.
Both the upper and lower level detector mounted on the door will automatically control cooling time and discharge pellets.
2. Main Structures and Operating Principles
The structure of the cooler refers to drawing 1. The cooler mainly consists of air seal machine, induced draft cover, cooling box, both upper and lower material level indicators, reducer, framework and aggregate bin. The working process remains as follows: the high-temp and high moisture granules produced from the pellet mill will be piled up in the cooling box by after passing through air seal machine and material discharger in turn. Cold air through cooling box will enter into the cooler, and its heat exchange with damp and hot granules will take place after the cold air going through the bed of material. Then, granules will get cooled after the work of induced draft system. Cool-down time depends on positions of both upper and lower material level sensors, that is, when the level of material reach to the upper, material discharge will be driven by motor and vice versa. The cooled granules will be discharged out by the aggregate bin.
Note: for complete pellet plant with a lower yield per hour, it is suggested that an integrated cooler (namely, a combination of cooler and sifter can be used for heightening working efficiency and having costs reduced.) For more details, please contact Kingman.
Main technical parameters:
| Model | Cooling Volume(m3) | Yield(t/h) | Cooling Time(min) | Air-absorbed Volume(m3/h) | Power(kw) |
| SKLN11 | 1 | 1-3 | 6-10 | 5000 | 2.2 |
| SKLN14 | 2.5 | 3-5 | 6-10 | 10,000 | 3 |
| SKLN19 | 5 | 8-10 | 6-10 | 15,000 | 3 |
| SKLN22 | 8 | 15-20 | 6-10 | 27,000 | 2.2+1.5 |
Special Supply:
Kingman can also offer integrated cooler and sieve, of which sieve is under the cooling chamber to assort pellets and other granule products. The sieve features easily renewed metal net and low maintenance costs. The cooler will run combined with the sieve thereunder recieving singals from the previous.
