A rotary furnace, also known as a rotary kiln or rotary tube furnace, is a heat-treating furnace of circular construction that rotates the workpiece or sample around the axis of the furnace during the heat treatment process.
It is commonly used in the mineral industry as a continuous plug flow reactor.
7 Key Points Explained
1. Structure and Function
The rotary furnace consists of a long tube that slowly rotates around its central axis.
The workpiece or sample is introduced into the reactor portion and is transported down the length of the tube while being mixed and heated.
2. Fuel Types
The furnace can burn powder, solid, gas, or liquid fuel to generate a flow of hot gases that heat the sample.
3. Design Features
The design of a rotary furnace typically includes a metal barrel lined with refractory material and installed at an angle.
The furnace may have multiple heat zones, and the heat can be applied through the hot gas discharge from the fuel or by firing the fuel directly into the tube.
4. Rotation and Mixing
The rotation of the rotary furnace allows for the sample to be passed from one end of the barrel to the other, facilitating the heat treatment process.
The rotation can also induce mixing or stirring of the sample, enhancing the uniformity of the heat treatment.
5. Gas Flow Direction
The hot gases pass through the chamber in the opposite direction of the sample, although there are applications where they can pass through in the same direction.
6. Continuous Processing
The rotary furnace is designed for continuous materials processing and can provide multiple thermal control zones to ensure precise heat treatment.
7. Basic Components
The basic components of a rotary furnace include the furnace body, the furnace lining, the drive gear, and the internal heat source.
The furnace body is the circular construction that houses the sample and allows for rotation.
The furnace lining is made of refractory material to withstand high temperatures.
The drive gear is responsible for rotating the furnace, and the internal heat source generates the hot gases for the heat treatment process.
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