The Study on the Energy-Saving Technique of down Draft Kiln
The down draft kiln which uses producer gas as fuel generates high-temperature waste gas, wasting a lot of energy and making it difficult to get high firing temperature. Based on the theory and experiences from practice, herein we propose a set of methods aiming at improving the energy efficiency of the kiln. The methods include: directly heating raw materials using the high-temperature waste gas from the kiln; changing the location of combustion chamber from the bottom to the top of the kiln; modifying other aspects (such as the numbers of kiln, the location of kiln and flue). The validity of these modifications was verified by an industrial experiment. It was demonstrated that with same size of kiln, the productivity of a kiln used for firing bauxite increased by more than 30% and the fuel consumption was reduced by more than 16%.