Cooler

Appointment

The cooler is designed to cool the granules coming from the granulator press. The pellet cooler helps maintain constant pellet temperature and humidity, which in turn ensures consistent product quality and increases equipment productivity.

The pressing process occurs at high temperature and pressure. To obtain durable pellets, they must be cooled immediately after leaving the granulator to avoid large losses of carotene, so the grass pellets are transferred to a cooler. With a counter flow of cold air, the product is cooled to ambient temperature and falls onto the sieving table.

Characteristic

• The cooler must be operated in a class -IIa production room at an ambient temperature of +10 to +35 °C and a relative air humidity of up to 80% at a temperature of +25 °C, equipped with supply and exhaust ventilation.

Technical specifications

• The cooler is designed to cool the granules coming from the press and consists of the cooler itself (cooling chamber), a vibrating screen, a fan and a cyclone with a sluice gate.
• To ensure proper conditions during transportation, the cooler is supplied disassembled.

1. main frame;
2. bunker;
3. lid;
4. unloading hopper;
5. racks;
6. sluice gate;
7. spreader;
8. viewing window;
9. product level control sensors;
10. unloading mechanism drive;
11. fixed frame shift mechanism.

Cooling pneumatic transport system

The cooling pneumatic transport system ensures the movement of air from the cooler and the separation of non-granulated mass from the air. The separation of the air flow and solid particles occurs in the cyclone, where a hatch is provided for cleaning in case it becomes clogged. The mass is continuously discharged from the cyclone using a sluice gate. The waste air flow is discharged through a pipe. The exhaust air is removed from the column by a cyclone-precipitator connected to the shaft. All moisture and dust from the granules remaining in the air remains in the cyclone.

The principle of operation

The granules after the press continuously flow by gravity into the cooler and are evenly distributed over the area of the cooler, for which a rotating spreader with a drive is installed in the upper part. To separate the pressing and cooling zones, a sluice valve is installed in the upper part of the cooler, which is driven by a gear motor.

At the same time, a powerful counter-flow of air created by a fan is drawn through the layer of granules. It cools the granules and reduces their moisture content. Air with particles of non-granulated product and small crumbs after the cooler enters the cyclone, where it is cleaned from small particles of product and dust. After the cyclone, the purified air is released into the atmosphere, and the separated product is fed for re-granulation.

The cooled granules are unloaded onto a vibrating table for subsequent sifting from the non-granulated mass. Conditioned cooled granules enter the unloading hopper and are then fed to subsequent technological operations.

Pellet cooling scheme

Granule distribution mechanism – The spreader is located on the hopper lid and is a rotating tray, which is driven by an electric motor through a worm gearbox. For different granule sizes, you can adjust the tilt of the tray, which, together with its rotation, ensures uniform distribution of the product over the surface of the cooler.

Granule distribution device

Advantages

• The level of the granule layer in the cooler is ensured by non-contact capacitive level sensors.
• You can adjust the cooling time; to do this, you need to change the installation height of the granules operating level sensor.
• The lid and sides are made of stainless steel.
• Simplicity of design and minimal maintenance.
• The cooler can be easily integrated into an existing production line without requiring significant changes to the equipment.

Advantages of the cooling process

• Improved granule quality: Uniform cooling of granules prevents them from cracking and clumping, which improves their appearance and quality.
• Increased product shelf life: When using a cooler, the pellets lose moisture faster, which reduces the risk of mold and other microorganisms and increases the shelf life of the product.
• Safety: Cooling the pellets reduces the risk of fires and explosions that can occur at high temperatures.
• Environmentally Friendly: Using a cooler can reduce greenhouse gas emissions because the granular material will lose moisture faster, reducing the time it takes to dry it.