Features Analysis About The Material Movement And Heat Transfer Process In The Rotary Kiln

The calcinations of Petroleum coke is one of the main for producing pre-baked anode and graphite products. Petroleum coke calcinations in the rotary kiln are completed by high temperature heating. Though calcinations to exclude volatile and water to improve the density of carbonaceous materials, electrical conductivity, mechanical strength and chemical stability. Using rotary kiln for petroleum coke calcinations has its virtues, for example a large production capacity, less investment and wider adaptability to raw materials, product quality can be control easily and process production is realize the advantages of automatic control. At present, most of the large-scale production plants are using rotary kiln as petroleum coke calcinations equipment. The quality of calcinations process is a direct factor on the quality of the product quality, so how to improve the petroleum coke calcinations quality in rotary kiln is being concerned day by day. In order to improving the petroleum coke calcinations quality and thermal efficiency. the factor which have effect on the material mixing and heat transfer is analysed ,based on the the numerical analysis and stimulation of the granular flow and heat transfer process in the the cross section,and the simple material heating experiment .Based on the features analysis about granular flow in the cross section of the rotary klin,to begin with we will provide a brief background on the theory about granular flow and its solution process,and represent the granular flow constitutive equation model established by Canada professor A.A.Boateng. Then the granular flow model was used to analyze the depth and velocity profile in the active layer in the cross section ,the industry kiln diameter 0.45—2.5m;Second,the path or mechanisms of heat transfer in rotary kiln were analyzed and stimulated. Espacially,the influence of rotaing and gas flow velocity on heat transfer coefficients was originally discussed.Then the pilot_scale evalution studies which the preparation for the Petroleum coke pyrolysis experiment, the Experiment was mainly divided as fellows: the discharging rate,temperature under the different rotating speed, wall and bed surface which 10 cm far from the outlet temperature profile in the steady state and so on.In conclusion,the rotary kiln is a slow-heating process unit,but convenient to the feed of solid with any size limit and favorable to the mixing of carbonous due to its rotation.