Analysis of Modulation Effect Factors of Granulating Pelletizer
Quenching and tempering is an indispensable process for granulation or puffing. Without good quenching and tempering system, there is no good granulation or puffing effect, and there are many factors affecting the quenching and tempering effect of the tempering device, mainly depending on the following three factors.
1 material performance
1.1 Material properties
Due to the variety of components of the feed, the nature of the materials is different, and the effect of quenching and tempering is also different. According to the composition of the main body, the material properties are divided into protein type, starch type, fiber type, fat type, heat type, etc., and the operating parameters should be different when quenching and tempering.
1.1.1 protein type feed protein has hydrophilicity, moisture should not increase too much when quenching and tempering, otherwise it is easy to block the pores of the film. For this reason, it is better to use superheated steam, because protein type feed is more important than heat. .
1.1.2 Starch-type feed starch requires high-temperature, high-humidity quenching and tempering conditions. Therefore, it is advisable to use low-pressure superheated steam or add some water in the mixer.
1.1.3 Fiber-type feed fiber has poor water holding capacity and cohesiveness. Therefore, the moisture should not be too high, generally 13%-14%, and the material temperature is controlled at 55-60 °C. If the material temperature is too high, the pressed particles are prone to cracks, using a lower superheated steam or adding a small amount of water to the mixer to reduce the temperature of the material during pressing.
1.1.4 Fat type feed The fat type feed should not be too high. For this reason, the use of higher superheated steam is beneficial to fat type granulation.
1.1.5 Heat-sensitive feed The heat-sensitive feed strives to have low quenching temperature, the material temperature is controlled below 60 °C, and the moisture should not be high. Therefore, lower superheated steam or a small amount of water in the mixer can be used to reduce the material. Temperature is effective.
1.2 Particle size and uniformity of
Due to the variety of components of the feed, the particle size and uniformity of the same type of powdered material are also different, which brings certain difficulties to the operation of the conditioner and puts forward higher requirements. Because the quenching and tempering requirements soften the center of each particle, if the small particles have been tempered, the large particle conditioning has not yet met the requirements. If the difference in particle size is larger, the difference in quenching and tempering effect will be greater. The latest research conclusions in foreign countries: The influence of the particle size of powder particles on the quenching and tempering effect is proposed. The particle size of the material is as close as possible to facilitate uniform quenching and tempering. For this reason, for large-scale feed mills with high quenching and tempering requirements, the granules can be graded first, and then quenched and tempered to achieve the best quality control effect, while saving energy.
1.3 moisture of materials
Moisture is an important factor affecting the quenching and tempering effect. Under the same conditions of quenching and tempering temperature and quenching and tempering time, the moisture content of the material is high, and the quenching and tempering effect is better than the material with low moisture content. Due to the poor resistance of microorganisms to damp heat, microorganisms can absorb high temperature water in the surrounding medium under the action of steam, thus promoting the solidification of microbial cell proteins and accelerating the death of microorganisms (the time of microbial death of damp heat materials is lower) 1/3 of the moisture material). Therefore, under the condition of high moisture content of the material, the damage and inactivation of the mold and pathogenic bacteria such as Salmonella and the hemagglutinin and protease inhibitor of the plant are high, and the degree of starch gelatinization is also high.
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Item Display
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