Tunnel kiln direct reduction method
Tunnel Kiln direct reduction method is a method for direct reduction of iron (DRI) from Iron ore. This method involves the reduction of ore at high temperatures and does not require the use of coke or other fuels for reduction. The method is energy efficient and can be used for the production of DRI on a small scale.
In Tunnel Kiln direct reduction method, a mixture of iron ore and other materials such as limestone, dolomite, and other metals is loaded into a tunnel kiln. The temperature is adjusted and heated to between 1100 and 1400 degrees Celsius. During this process, the ore is heated and reduced in the kiln and the result is direct reduced iron (DRI). The process is relatively speedy, and the entire reduction process takes 12-15 hours, depending on the type of ore.
The main advantage of the Tunnel Kiln direct reduction method is its energy efficiency. Compared to traditional blast furnace technology, the Tunnel Kiln process can reduce the energy requirement by 25% to 50%. This is due to the heat generated by the combustion of the fuel to heat the kiln which is kept constant over the entire duration of the process, as opposed to blast furnaces where the fuel is continuously consumed and the temperature is adjusted accordingly.
The Tunnel Kiln direct reduction method is also advantageous for several other reasons. The process does not require the use of coke or other fuels, making it more environmentally friendly. Furthermore, the method is faster and doesnt require as much labor as traditional blast furnace technology. Additionally, the use of carbon dioxide emissions is significantly reduced due to the direct reduction process.
The Tunnel Kiln direct reduction method has become a popular method of producing DRI on a small scale and is slowly becoming more widespread on an industrial level. The process is energy efficient, cost effective, and environmentally friendly. While it is not suitable for high capacity operations, it can be a great alternative for smaller scale production.