加氢裂化尾油炉混合预热二段超温原因分析及解决措施

CAUSES ANALYSIS AND SOLUTIONS FOR OVER-TEMPERATURE IN THE SECOND MIXING AND PREHEATING SECTION OF HVGO FURNACE

针对独山子石化百万吨乙烯裂解装置加氢裂化尾油裂解炉,在将石脑油进料改为加氢裂化尾油进料过程中出现混合预热段二段(HTC-2)出口超温现象,进行工艺操作、设计参数、热负荷、孔板设置等方面的探究,分析了导致超温的主要原因和产生的相关危害。通过采取控制裂解炉热负荷和严格控制切换注汽时间两种措施,避免了超温现象的出现,消除了在生产过程中一次注汽管线产生裂纹的问题。

Aiming at the over-temperature of process materials at the outlet of the second mixing and preheating section( HTC-2) of HVGO furnace in the megaton ethylene plant at PetroC hina Dushanzi Petrochemical Company when its raw materials were changed from NAP to HVGO, this article studies the process operation, design parameters,thermal load and orifice sizes,and analyzes the reasons for the over-temperature and the related hazards. The over-temperature was avoided and the crack problem of the primary steam injection pipeline was solved by controlling the thermal load of cracking furnace and strictly controlling the switch of steam injection time.