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某厂催化裂化装置外取热器管束出气管根部与三通连接位置接连发生爆裂,此处发生爆裂尚属首次。为找出管束爆裂的主要原因,运用了计算流体力学软件Fluent中的DPM模型对该处气液两相流场、管壁的冲蚀情况及水蒸汽中水滴分率对管壁冲蚀的影响进行了数值模拟。结果表明,管束爆裂处混合流体速度最大,冷凝水滴浓度最高,致使冲刷最严重,且水滴的分率越大,冲刷越严重。腐蚀及冲刷的交替恶性循环是造成外取热器管束爆裂的主要原因。
A plant catalytic cracking unit outside the heater tube bundle outlet and the tee at the junction of the occurrence of a burst burst where burst is still the first time. In order to find out the main reason of tube burst, the influence of DPM model of Fluent in computational fluid dynamics software on the flow field of the gas-liquid two-phase flow field, the erosion of the pipe wall and the water droplet fraction in water vapor The numerical simulation was carried out. The results show that the velocity of the mixed fluid at the burst of the tube bundle is the highest, and the condensed water droplets have the highest concentration, resulting in the most serious erosion. The larger the water drop fraction, the more serious the erosion. The vicious cycle of corrosion and erosion is the main reason for the bursting of the outer tube bundle.