Rotary kiln incinerators are specialized equipment used for the disposal of hazardous waste.
These incinerators are particularly effective for handling chlorinated hydrocarbons like polychlorinated biphenyls (PCBs).
They operate at high temperatures, providing long residence times.
This flexibility allows them to process various types of waste, including gas, liquid, solid, and drummed materials.
There are two main types of rotary kiln incinerators: direct-fired and indirect-fired.
2 Types of Rotary Kiln Incinerators: Direct-Fired vs. Indirect-Fired
Direct-Fired Rotary Kiln Incinerators
Direct-fired rotary kiln incinerators are the most efficient due to direct heat transfer between the material and the heating medium.
In these kilns, the process gas passes through the drum either co-currently (in the same direction) or counter-currently (in the opposite direction) to the material.
The drum is typically refractory lined and may contain lifting or tumbling flights to improve heat transfer.
These flights encourage bed turnover or create a showering effect of the material through the process gas.
Direct-fired kilns are suitable for a wide range of applications.
However, they are not ideal for handling flammable and explosive materials that cannot be heated by an open flame.
Indirect-Fired Rotary Kiln Incinerators
Indirect-fired rotary kiln incinerators are designed to handle materials that are flammable, explosive, or chemically active.
In these kilns, heat is transferred to the processing material indirectly through the casing, avoiding direct contact with an open flame.
This type of kiln is horizontal and can be preheated by burning natural gas or fuel.
Heat is transferred to many burners outside the barrel to avoid local overheating of the enclosure.
Indirect-fired kilns are not recommended for the production line of quicklime or cement.
However, they are ideal for processes requiring controlled, indirect heating.
Both types of rotary kiln incinerators offer unique advantages.
They are selected based on the specific requirements of the waste material being processed.
These incinerators are crucial in managing hazardous waste effectively.
They ensure environmental safety and compliance with stringent regulations.
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