Rotary furnaces are versatile pieces of equipment that can use various types of fuel depending on the specific application and requirements.
The choice of fuel is influenced by several factors, including energy efficiency, cost, availability, and environmental considerations.
5 Key Options Explained
1. Natural Gas and Propane
Natural gas and propane are commonly used fuels for both direct and indirect rotary kilns and dryers.
2. Fuel Oil
Fuel oil, such as diesel or #6 oil, is also used in some cases.
3. Electricity
Electrically powered rotary furnaces are another option, especially in situations where other fuel sources are not available or are less practical.
4. Biomass Combustion and Waste Heat
Biomass combustion and waste heat can also be used as fuel sources.
5. Biogas
Biogas is another alternative fuel that can be utilized in rotary furnaces.
How a Rotary Furnace Operates
A rotary furnace typically involves burning the fuel directly in the working section of the furnace.
The heating gases flow towards the material being processed.
The furnace is a metal drum that is lined with refractory brick and mounted at a slight angle to the horizontal on supporting rollers.
The drum is rotated by an electric motor through a reduction gear and toothed transmission.
The fuel is injected through burners or nozzles located in the heating cap, and the processed material is unloaded for cooling at the same point.
Dust and sublimates are cleaned from the gases produced by the furnace.
Dimensions and Output
The dimensions of rotary furnaces can vary widely, with lengths ranging from 50 to 230 meters and diameters from 3 to 7.5 meters.
The output of a rotary furnace can be as much as 150 tons per hour of processed product.
There is a trend towards combining rotary furnaces with heat-exchange equipment to increase efficiency and reduce size.
Differences from Direct-Fired Rotary Equipment
Direct-fired equipment typically has a single burner mounted at the discharge of the rotating tube, creating a flame inside the process environment that directly heats the material.
However, direct-fired equipment has limitations in temperature control and atmosphere control, making it suitable for specific industries.
Rotary furnaces, on the other hand, offer high thermal efficiency, low operating costs, and the ability to accept a wide variety of feed materials.
They are often used in batch processes and can be operated by relatively unskilled workers.
Continue Exploring, Consult Our Experts
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