Alpha gypsum powder steam rotary crystallization kiln

The utility model belongs to the technical field of gypsum processing, and relates to an alpha gypsum powder steam rotary crystallization kiln. The device comprises a kiln body, a supporting device, a transmission device, a rotary joint and a heat exchange device, the heat exchange device comprises an inner heat exchange coil pipe and an outer heat exchange coil pipe, the inner heat exchange coil pipe is a pipe body with a hollow semicircular cross section and is annularly fixed on the inner wall of the kiln body, and the straight surface end of the inner heat exchange coil pipe is in contact with the inner wall of the kiln body; the outer heat exchange coil pipe is a pipe body with a hollow semicircular cross section and is annularly fixed on the outer wall of the kiln body, and the straight surface end of the outer heat exchange coil pipe is in contact with the outer wall of the kiln body; the rotary joint is communicated with the inner heat exchange coil pipe, and the outer heat exchange coil pipe is commu