用二维模型分析裂解炉管操作工况

Analysis of Working Condition of Pyrolysis Tubular Reactor by Two dimensional Model

用经工业装置验证了的二维模型对大庆３０万ｔ乙烯裂解炉进行模拟分析，结果表明ＥＦ１１１Ｅ炉乙烯收率未达到最佳反应深度。其原因在于由管内流速引起的停留时间分布及径向温度分布影响了焦层厚度，对生产起制约作用。通过计算，将进料量调整到１．１倍，烟气温度由１０６５℃提高到１１２０℃，炉出口温度由８２０℃提高到８５０℃，在不增加炉管出口焦层厚度的情况下，乙烯收率可由原来的２７．１５％提高到２９．５％以上。

The pyrolysis reactor of Daqing 300 thousand ton ethylene complex was simulated by two dimensional model which had been checked by industral operations. The results show that EF 111E oven failed to reach the required pyrolysis severity for optimum yield of ethylene. The reason is that the residence time, the radial distributions of linear velocity and temperature of fluids in the reactor affect the thickness of coke layer greatly, they acts as controlling facfors of production. According to the calculated results, the feed input is adjusted to 1.1 times, the flue gas temperature over bridge wall is changed from 1 065 ℃to 1 120 ℃, the outlet temperature of the reactor is changed from 820 ℃ to 850 ℃, at such conditions, the vinylic yield is increased from the previous 27.15% to more than 29.50% without increasing the thickness of coke layer.