When the transformation is to increase the diameter of the inner cylinder rotary kiln to reduce the resistance of important measures.Within the traditional preheater preheater tube diameter is the effective diameter of about 0.45 to 0.5 times.The form of a large volute cyclone preheater to increase the inner tube may be provided.Model testing and production practices show that,within the rotary kiln from small to large diameter tube,when no more than a certain critical point, the resistance decreases rapidly been lost, while reducing the efficiency of separation is relatively slow.Therefore,the guarantee under the premise of separation efficiency,especially for middle-grade cyclone preheater,rotary kiln used in the larger diameter tube will help to reduce the system resistance,while the separation efficiency of the preheating system has little effect.It must be noted that the rotary kiln can not be unlimited within the tube diameter increases,when the inner tube preheater rotary kiln with an extension cord into the outlet inside the tangent or intersect,the diameter of the inner cylinder exceeds a certain critical point,will rapidly reduce the separation efficiency, and gas within the cylinder of the rotary kiln increased erosion,accelerated wear and tear.

Extension tube insertion depth of the rotary kiln is an important measure to improve the separation efficiency,but with the inner tube preheater rotary kiln longer,the system resistance increases.For the pre-heater system,we pursue the whole system of low resistance and efficient,so for every single preheater,the transformation can be used in different technical means to strengthen or dilute some of the parameters of the design,reducing transformation investment and difficulty.Model testing and production practices that,under certain conditions, the same tube diameter rotary kiln,rotary kiln tube insertion depth within the extended twice,the separation efficiency is essentially the same,load resistance is increased by 30% or more. Therefore,in the transformation,the preheater for the middle class,focusing on reducing the system's resistance to damage from the perspective of choice as far as possible within the tube into the light of the rotary kiln.In addition,as a preheater to improve the separation efficiency of the separation of the preheat system decomposition efficiency and thermal efficiency, exhaust gas treatment system to reduce the burden is essential to the transformation of the first stage preheater,separation efficiency can be increased focus from the point of view,the diameter of the rotary kiln and the insertion depth of the inner cylinder,can be unconventional design.

Transformation in the widely used form of rotary kiln tube structure sub-piece hanging round the inner cylinder, the inner tube preheater rotary kiln with preheater cylinder centerline centerline coincide.The set of early adopters of the eccentric rotary kiln inner cylinder, the inner and rectified shaped resistance reducing structure and components,etc., although in theory there is a good low resistance results, but the rotary kiln production and maintenance of complex equipment, in the long-term adverse easily damaged rotary kiln deformation conditions, life is short, sometimes difficult to play its due role, and part of the fall can also cause mechanical blockage, under normal circumstances may adopt.