Factors Affecting Dehydration in Biology organic Fertilizer Dryers

 The core factors affecting dehydration in biology organic fertilize dryers fall into three categories: fertilizer produciton machine parameters, material characteristics, and process operation. The core issue is the matching of heat exchange efficiency and material mass transfer rate. Specific key factors are as follows:

1. Basic Material Characteristics: Excessive initial moisture content can cause material to stick to the walls and clump, hindering heat contact; uneven particle size can lead to overheating of small particles and insufficient dehydration of large particles; high organic matter content can limit drying temperature due to heat sensitivity, indirectly affecting dehydration efficiency.

2. Equipment Operating Parameters: The rotational speed and inclination angle of the drying drum determine the material residence time. Too slow a speed/too small an inclination angle can easily lead to material piling up, while too fast a speed/too large an inclination angle results in insufficient heat exchange; the structure and number of lifting plates inside the drum affect the material dispersion effect, and uneven dispersion will significantly reduce the heat contact area.

3. Heat Transfer Process Conditions: Hot air temperature is crucial. Too low a temperature results in insufficient enthalpy, while too high a temperature can lead to inactivation of beneficial microorganisms and material charring. Hot air volume and velocity must be matched; insufficient volume can create thermal dead zones, while excessive velocity shortens the contact time between the heat transfer medium and the material, resulting in low heat utilization. The direction of hot air flow (co-current/counter-current) also affects the dehydration rhythm; co-current flow is suitable for high-humidity initial dehydration, while counter-current flow is suitable for low-humidity deep dehydration.

4. System Matching and Operation: Poor sealing performance of the dryer can lead to heat transfer medium leakage and sudden temperature drops. Insufficient negative pressure in the induced draft system can hinder the discharge of hot and humid air, increasing humidity inside the drum and inhibiting material moisture evaporation. Large fluctuations in the material feed rate during operation can disrupt the material-heat balance, causing uneven dehydration in certain areas.