关键词: 加氢空冷器, 氯化铵结晶, 风险评估, 腐蚀防控, 专家监管

Abstract:

Diesel hydrogenation process is an important means to produce refined diesel with catalytic diesel as feedstock. Hydrogenated air cooler is one of the key equipments of diesel hydrogenation unit. Due to the strong corrosion of catalytic diesel oil and the harsh operating conditions of the equipment, the corrosion failure of air cooler tube bundles occurs frequently, which seriously affects the long-term safe and reliable operation of the unit. This paper takes a diesel hydrogenation air cooler in a petrochemical enterprise as the research object, analyzes its process correlation process and determines the source of corrosion hazards. The PR-NRTL model of state is used to establish a multi-component fluid phase state-ion balance model for the hydrogenation reaction effluent system, and the risk assessment of ammonium salt crystallization under typical working conditions is carried out. By analyzing the risk of ammonium salt crystallization in air cooler tube bundles under variable working conditions, the correlation between N and Cl contents and ammonium salt crystallization temperature is studied. Finally, the corresponding process protection measures are proposed for the possible corrosion risks of air cooler.

Key words: hydrogenation air cooler, ammonium chloride crystallization, risk assessment, corrosion prevention and control, expert supervision