Key Operating Points for Drying Materials in a Biology organic Fertilizer Dryer

 The core challenge of biology organic fertilizer dryers, which differ from ordinary fertilizer dryers, is to reduce moisture content to meet standards without killing beneficial bacteria at high temperatures. Operation and control must take into account three key factors: temperature, rotation speed, and feed rate.

Before feeding, assess the basic condition of the raw materials. After granulation, the moisture content is typically around 30%, with loose granules and no large clumps. Crush and screen any lumps beforehand to prevent accumulation and blockage in the drum. Feeding should be continuous and uniform, avoiding sudden changes in quantity. Excessive feeding will cause material accumulation in the drum, incomplete drying, and excessive moisture content in the output. Insufficient feeding will cause the material to be exposed to high temperatures too quickly, resulting in significant inactivation of the microorganisms.

 

Drying temperature must be strictly controlled in stages. The temperature in the low-temperature preheating stage should be controlled between 60 and 80℃. The maximum temperature in the middle drying stage should not exceed 100℃. The cooling stage should rapidly reduce the temperature to below 40℃. Directly blasting the material with high-temperature furnace heat is strictly prohibited, as this will directly destroy organic matter and functional bacteria, reducing fertilizer quality. Operators monitor the inlet and outlet temperatures and exhaust gas temperature in real time, adjusting the hot air supply according to the material's moisture content. If the moisture content is high, slightly increase the airflow; do not simply increase the temperature.

 

Adjust the drum rotation speed in conjunction with the cooling process. Use a variable frequency speed control for the drum; for wet materials, slow down the rotation speed to extend the drying time, and for dry materials, speed up the drying process to reduce the heating time. After exiting the dryer, the material immediately enters the cooling and screening equipment to quickly remove residual heat and prevent it from continuously simmering and sterilizing the material. Regularly clean any material adhering to the inner wall of the drum; accumulated material will carbonize due to prolonged heating, contaminating the finished product and affecting nutrient content, and can also clog air ducts, reducing drying efficiency.

 

Daily inspections include moisture testing; take samples every half hour to measure the output moisture content, maintaining a standard below 20%. Simultaneously check the hot air duct seals to prevent air leakage and uneven drying; ensure the dust removal device is unobstructed to avoid dust accumulation affecting the heat exchange efficiency of the fertilizer production machine. Standardized temperature control, uniform feeding, and timely cooling stabilize the finished product's moisture content and maximize the preservation of microbial activity, ensuring the quality of the bio-organic fertilizer product.