Auxiliary heating type steam rotary dryer

Abstract

The invention provides an auxiliary heating type steam rotary dryer comprising a drum for containing a material to be dried and a rotary support device for supporting and driving the drum to rotate, wherein the drum is provided with a feed end and a discharge end, the feed end is constructed for receiving the material to be dried, the discharge end is constructed for discharging the dried material, the feed end is provided with a feed end plate, the discharge end is provided with a discharge sealing plate and a discharge cover, a plurality of heat exchange tube assemblies which rotate together with the drum are arranged in the drum, a drum heat tracing device connected with the heat exchange tube assemblies is arranged outside the drum near to the feed end area, and the drum heat tracing device rotates together with the drum. The invention adopts a drum heat tracing structural style, so that when the water content of the dried material is higher, the temperature of the drum wall can be improved to promote evaporation of water of the dried material and improve the flowing property of the material.

Description

Technical field [0001] The invention relates to a drying equipment, in particular to an auxiliary heating type steam rotary dryer for drying wet powder materials. Background technique [0002] The steam rotary dryer is an indirect heat exchange rotary drying equipment that uses steam as a heat source. It is suitable for drying wet powder materials in metallurgy, chemical, environmental protection, building materials and other industries. Such as: copper fine powder, iron fine powder, nickel fine powder, coal powder, desulfurized gypsum, sulfite, etc. At present, there are two types of steam rotary dryers that are widely used in China. One is a straight tube integrated dryer, as described in EP0305706A2, that is, the heat exchange tube adopts a straight tube running through the entire cylinder, and the heat exchange tube is welded and fixed on the cylinder. Above; The other is an independent detachable dryer, as described in US6415527B1, US2006 / 0242855A1, that is, there is no fix...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide an auxiliary heating steam rotary dryer, and solve the problem of poor fluidity of materials in the drum of the current steam rotary dryer, and wall sticking on the inner wall of the drum and the outside of the heat exchange tube assembly problems, and further solve the problems existing in the current steam rotary dryers such as easy material return, material leakage, short service life of heat exchange tubes, high processing costs and maintenance costs

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