Solutions for Improving Drying Uniformity in Biology organic Fertilizer Dryers

 Improving the drying uniformity of biology organic fertilizer dryers  involves adjustments to four key aspects: equipment structure, process parameters, material condition, and auxiliary equipment, balancing dehydration efficiency with the activity of live bacteria.

 

First, optimize the internal material lifting structure of the drum by replacing or adding wear-resistant composite lifting plates to ensure the material is fully lifted and scattered, avoiding localized accumulation dead zones. Adjust the lifting plate angle according to the material characteristics to create a uniform material curtain within the drum, increasing the contact area with hot air and preventing material from sliding against the walls and uneven drying. Simultaneously, check the drum's coaxiality and the support rollers to prevent drum tilting, which could cause material deviation and accumulation on one side.

 

Second, refine the control of operating parameters by using frequency converters to regulate the drum speed. Too high a speed results in insufficient material residence time and incomplete drying, while too low a speed leads to uneven heating and material accumulation. The speed should be stabilized within a reasonable range based on production capacity. Strict control of hot air temperature and velocity is implemented, maintaining the bio-fertilizer intake air temperature between 60–85℃. Zoned temperature control is used, with rapid dehydration at the front, constant temperature and humidity in the middle, and gradual cooling at the rear. The induced draft fan airflow is matched to the cylinder load to ensure hot air penetrates the entire material layer, preventing short-circuiting.

 

Then, proper pre-treatment of the feed is crucial. Fermentation materials are pre-screened and broken up to prevent large clumps from becoming dry on the outside but wet on the inside. A uniform feeding spiral ensures continuous, quantitative, and even feeding, preventing inconsistent amounts and material pile-ups, thus stabilizing the material layer thickness from the source.

 

Finally, the airflow and sealing system are improved. Blocked air ducts are cleared, and baffles and guide vanes are inspected to ensure comprehensive hot air distribution. The seals at both ends of the cylinder are repaired to prevent cold air from entering and disrupting the temperature field. Regular cleaning of the cylinder walls to remove adhering material and inspection of worn lifting plates, combined with online moisture monitoring and real-time parameter adjustments, allows the moisture content deviation of the entire batch of material to be controlled within ±1.5%, significantly improving drying quality.

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