关键词: 多腔回转炉, CFX软件, 传热, 催化剂, 颗粒, 数值模拟

Abstract: Based on the CFD software CFX, heating process of catalyst particles in a multi-chamber rotary kiln was analyzed, the residence time of catalyst particles in high temperature regions predicted, and the axial temperature distributions of catalyst particles, air and kiln were simulated. Thermal energy distributions inside the kiln were also simulated. The result comparison of multi-operating conditions reveals that as the air inlet velocity is increased to twice, the residence time shorten to 0.978 time and electrical energy increased to 1.918 times. Most of the power consumption is first attributed to the heat loss by outer wall of the kiln, and then the air temperature is raised. When the catalyst inlet velocity is raised to 5 times, its residence time decreased to 0.193 times, and electrical energy consumption increased to 2.047 times. Most of the power is first consumed by the outer wall, and the catalyst temperature raised. As the thermal conductivity coefficient of kiln is boosted to 4 times, the residence time lasts up to 1.007 times, and electrical energy consumption rises to 1.147 times. Most of the electrical power is lost through the outer wall. Low air inlet velocity, relatively low catalyst inlet velocity and relatively high kiln thermal conductivity are significant for design of such rotary kiln with good performance. The simulated temperatures are consistent with experimental data, validating the feasibility and correctness of simulation.

Key words: multi-chamber rotary kiln, CFX, heat transfer process, catalyst, particles, numerical simulation