延迟焦化装置掺炼FCC油浆的工业实践

Commercial practice of blending FCC slurry into feed of delayed coking unit

中国石油化工股份有限公司洛阳分公司延迟焦化装置掺炼FCC油浆的比例稳定维持在10%以上,最高达到13.6%。掺炼FCC油浆后,延迟焦化装置的操作苛刻度降低,经济效益可观,每月可创效864万元;但石油焦和蜡油产品质量变差,石油焦挥发分质量分数下降1.25百分点,灰分质量分数上升0.15百分点,蜡油残炭质量分数上升1.19百分点,密度上升67 kg/m^3,装置燃料气、3.5 MPa蒸汽、电的单耗均上升;加热炉炉管和炉出口转油线结焦加剧,炉出口压力上升速率较掺炼油浆前增大0.015 MPa/月;出现了加热炉进料泵出口弯头、跨线阀、进料调节阀阀芯严重磨蚀等问题,装置安全运行风险急剧上升。针对存在问题提出了开展预知性维修、控制油浆固含量、进行设备材质升级、缩短检修周期、优化工艺流程等应对措施和建议。

After blending the FCC slurry oil into the feedstock of delayed coker at a ratio of 10 m% or higher（ mass） and 13. 6 m% maximum in SINOPEC Luoyang Company,the operation severity of the delayedcoker is reduced and the economic benefit is greatly improved,which is about 8. 64 million Yuan RMB; The petroleum coke and wax oil product qualities become poor. The volatile content of petroleum coke drops by1. 23%,the ash increases by 0. 15%,the carbon residue of wax oil value rises by 1. 19% and the density goes up to 67 kg/m^3. The consumptions of fuel gas,3. 5 MPa steam and electricity of the unit rise up. The coking in furnace tubes and outlet oil line becomes increasingly serious,and the outlet pressure rise of furnace is 0. 015 MPa/month higher than that before slurry oil blending. Whereas,some problems arise such as serious erosion of elbows of feed pumps of furnace,cross-line valves,feed control valves,etc. To solve these problems,it is recommended to carry out unscheduled maintenance,control of solids in oil slurry,upgrading of equipment materials,shortening of overhaul cycle and optimization of process flow,etc.