During commissioning of pyrite concentrate drying system with 2 disk dryers in a 400 kt/a sulphuric acid plant,inefficient capacity and frequent failures were encountered.

Through the analyses of current situation of technical level for coal drying and dewatering, the paper suggests to take overheat steam produced from power plant as a heat source, use the disk dryer to deeply reduce coal moisture with simple working process and low production cost.

There are many problems with the conventional plate dryers used in the bleaching powder prodution,such as high specific power consumption,much dust and problems in continuous control of data control system (DCS),etc.

Chain dryer is a type of drying equipment mostly applied in domestic ceramic factories.

The ventilating no-load experiments of the box dryer are carried out to determinethe velocity field and analyze the cause of taking place of the uneven characteristics.

To belt drier, the drying effect is influenced by the material uniformity directly, so a distributor should be set between the feeding device and the drying belt of the drier.