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This paper focuses on the indirect thermal drying sludge technology based on spiral equipment. At first, the paper analyzes the current situation of the sludge treatment research, and the problems caused by lacking of effective sludge treatment, including environmental pollution, ecological destruction, the dangers of people’s normal lives and so on. This paper also introduces the development status of international sludge drying devices and China's domestic sludge drying processing industry. At third part of this paper introduces the principle of spiral indirect drying technology and detailed design method. At last, the indirect spiral sludge heat drying equipment which suits China's national conditions, the highly drying efficiency, easy to adjustment, free from pollution to the environment, concise and easy to maintain is designed out.

Research on the indirect thermal drying sludge technology based on spiral equipment