Abstract: This article discusses about difficult separation of gas，dust and tar from raw gas in dry distillation of pulverized coal，and presents detailed introduction to technical principles and process flow of moving granular bed technology. In coal dry distillation，the application of moving granular bed solves the difficulty in gas-dust-tar separation and realizes stable operation in the system.

Key words: Granular bed, High temperature dedusting, Retorting gas, Application