Coal Rotary Dryer

Description

A coal rotary dryer is a type of drying equipment used for drying various materials, such as coal, lignite, carbocoal, and other high-moisture content materials like anthracite, lean coal, poor lean coal, lean coal, coking coal, fat coal, air fertilizer coal, gas coal, and weakly caking coal.

The process involves using the heat generated by burning coal to send hot air into the drying chamber through the hot air system, which evaporates the moisture in the material and dries it.

Key components and benefits of coal rotary dryers include :

– Feed chute or conveyor: Used for delivering the coal fines to the dryer.
– Rotary Dryer: The drying machine is a rotary drum set at an angle of about 3-5 degrees and rotates at a speed of 2-8 RPM. The coal remains in the drum for 8-12 minutes.
– Combustion chamber with burner: The heat energy generated by burning coal is used to send hot air into the drying chamber.
– Secondary air blower: Augments air for the burner, which delivers hot gases into the combustion chamber.
– Cyclone or Baghouse: Used for dust collection before being discharged through the exhaust stack.
– Induced air blower: Adds additional air to the stack.
– Controls: Monitors temperature and pressure at various points in the process, ensuring normal and safe production.

Advantages of coal rotary dryers include :

– Simple and reliable operation.
– High drying thermal efficiency compared to other drying systems.
– Adjustable feeding quantity with a sealed coal feeder, ensuring fluent and unblocked coal flow.
– Measures taken to collect dust and prevent smoke at the drying drum, hot blast furnace, and system transfer point.
– Automatic monitoring system for temperature and pressure.
– Big volume drum dryers to shorten the residence time of coal in the dryer, preventing coal burning and pulverization.

Coal rotary dryers are widely used in various industrial fields, such as the coal industry, metallurgy industry, and building materials industry, for drying and heat treatment of materials with high humidity.