The source of raw materials used in feed processing and the variety of varieties have brought about differences in the moisture distribution of feed processing intermediate products and final products and the variability of water content.
Studies have shown that the moisture content of the semi-finished powder after mixing is generally between 9% and 14%, and the moisture content of the mold material after quenching and tempering is relatively reasonable between 15% and 17%. The pellet feed produced at this time has good processing quality, uniform smoothness, low powdering rate, and low energy consumption, and the moisture content of the final product is also easy to meet the standard requirements.
Generally, the moisture content of the pellet feed should not be higher than 12.5%, and it should be no higher than 13.5% in the north. If the pellet feed is processed in the summer, the optimum moisture of the finished pellet is preferably not higher than 12.5% ​​due to the higher ambient temperature. Otherwise it is easy to mold and deteriorate.
Reduce the steam supply pressure of the boiler during the production of pellet feed, and increase the water content of the steam supply.
Usually, the feed production boiler has a steam supply pressure of 7-9 kg/cm2 and a production pressure of 3-4 kg/cm2. The higher the pressure, the lower the humidity; conversely, the lower the pressure, the higher the humidity and the higher the moisture content of the steam. Therefore, as long as the production needs are met, the lower the pressure, the better. It is recommended that the boiler steam supply pressure be adjusted to 4-6 kg/cm2 and the production use pressure adjusted to 2-2.5 kg/cm2.
Increase the quenching and tempering time of materials in the conditioner
Increasing the residence time of the material in the conditioner, so that the material and steam are fully mixed, is conducive to starch gelatinization, improve the digestion and absorption rate of livestock and poultry, and also enables the material to fully absorb the moisture in the steam, thereby increasing the moisture of the product. Increasing the quenching and tempering time can be solved by reducing the speed of the conditioner or adjusting the blades of the conditioner.
Close or adjust the steam trap in the steam supply pipe
Usually, a lot of steam traps are installed in the steam drum and the steam supply pipe, the purpose of which is to remove the condensed water in the steam pipe, prevent the steam from introducing too much water, and cause the granulator to block the machine, but in summer, due to the raw materials The water content is lower, the water content of the steam is also lower, and the moisture content of the tempered material is difficult to reach 16%. Therefore, adjusting or closing the trap will not cause the machine to block, but will help to increase the moisture of the product.
Choose the right size of the material ring mold
The pore size and thickness of the feed ring mold are not only the main factors affecting the capacity of the granulator, but also affect the moisture of the pellet feed product. The die with a small aperture has a small diameter of the particles, and the cooling air volume of the cooler easily penetrates the feed particles, so that the moisture carried away during cooling is high, and the moisture of the feed product is low. On the other hand, the material ring mold with a large pore diameter has a large particle diameter, the cold wind does not easily penetrate the particles, and the water taken away during cooling is less, and the moisture of the feed product is increased. For the ring mold with larger thickness, the friction resistance is larger during the granulation process, the material does not easily pass through the pore diameter, and when the granulation is performed, the friction temperature is high, the water dispersion is large, and the moisture of the feed pellet is lowered, so it is recommended to use When making a ring mold, the hole diameter and thickness of the stamper should be suitable.
When the feed pellets are cooled, it is necessary to choose a suitable cooling air volume.
The purpose of the cooling process is to reduce the temperature of the pellet feed to a temperature of 3-5 ° C; on the other hand, it can also take away the moisture in the feed, so that the moisture of the feed product meets the specified requirements, according to the moisture of the finished product before cooling. Set the cooling parameters of the corresponding finished product to avoid excessive water loss.
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