Rotary Drum Dryer for NPK Fertilizer with Under 1.5% to 2% Moisture Continuous Tightly Sealed Heat Exchange and Lifting Flights and Chains

Rotary drum dryer for NPK fertilizer

1.Product Introduction

A Rotary Drum Dryer for NPK fertilizer is specialized thermal equipment designed to dry newly granulated compound fertilizers containing Nitrogen (N), Phosphorus (P), and Potassium (K). Fresh NPK granules typically have high moisture and low structural strength. This dryer uses precisely controlled temperatures to reduce moisture levels to under 1.5% to 2%, which hardens the granules, prevents caking during storage, and ensures a long shelf life.

2.Application

• NPK Compound Fertilizers: Drying high, medium, and low-concentration NPK fertilizer granules.

• Mineral & Chemical Fertilizers: Processing single or multi-nutrient fertilizers like Diammonium Phosphate (DAP), Monoammonium Phosphate (MAP), and Potassium Sulfate (SOP).

• Organic-Inorganic Blends: Drying compound fertilizers that mix chemical nutrients with organic bases.

3.Working Principle

The dryer operates on a continuous, tightly sealed heat exchange mechanism:

• Feeding: Wet coal is continuously fed into the slightly inclined, rotating cylindrical drum.

• Cascading & Drying: Internal lifting flights and chains lift the coal and shower it through the hot air stream. This constant movement breaks up clumps and creates a uniform curtain of coal, allowing rapid heat transfer and moisture evaporation.

• Discharge & Safety Control: The dried coal slides to the lower discharge end. An induced draft fan pulls the moist air out through a cyclone and baghouse filter to capture fine coal dust. Safety systems, such as inert gas injection or explosion relief valves, are often integrated to manage combustible coal dust safely.

4.Technical Specifications