延迟焦化装置分馏塔塔底防结焦技术改造

针对中国石化天津分公司延迟焦化装置分馏塔塔底的结焦问题，采用蜡油与焦炭塔油气直接换热的方法，对装置进行了改造。结果表明，改造后分馏塔蒸发段温度提高了１０℃；蜡油残炭质量分数增加了０．２０５个百分点，密度增加了６．７５ｋｇ／ｍ３，表明改造后蜡油质量略有降低；装置循环比平均值下降了０．０８个百分点，加工量提高了１３５ｔ／ｄ，液体收率增加了１．１８个百分点，装置经济效益得到提高。

Technology revamping for inhibiting coking at fractionater bottom in delayed coking unit

In order to resolve the problem of co- king at fraetionater bottom in a delayed coking unit of Tianjin Branch, SINOPEC, a corresponding re- vamping was conducted by the process of direct heat exchange between wax oil and oil gas from eoking chamber. The results showed that after the revam- ping, the evaporator temperature increased by 10 ℃,the mass fraction of carbon residue in wax oil increased by 0. 205 percent points, the density in-creased by 6.75 kg/m^3, indicating the oil quality decreased slightly. The circulation ratio decreased by 0.08 percent points in average, processing volume increased by 135 t/d,the liquid yield increased by 1.18 percent points, so that the economic benefit of the unit was improved.