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金陵石化1.50Mt/a加氢裂化装置以沙轻直馏蜡油和焦化蜡油的混合油为原料,生产航煤、柴油、液化气、轻石脑油和重石脑油,产品方案为最大量生产优质中间馏分油,也可实现多产重石脑油的工艺方案。该装置由反应、分馏、液化气分馏和脱硫、轻烃回收及气体脱硫、溶剂再生五部分组成。装置分馏部分设置主汽提塔、第一分馏塔和第二分馏塔。分馏部分的第一个塔为主汽提塔,通过3.5MPa蒸汽汽提,使得轻石脑油组分及少量重石脑油组分自汽提塔顶抽出,以尽量减少塔底带硫,保证重石脑油及航煤产品腐蚀合格。该装置在检修后首次开工时引起航煤银片腐蚀不合格,其原因是加氢过程中产生硫化氢,硫化氢未能从产品中脱除,航煤产品中含有1～2mg/kg硫化氢就可能导致2级银片腐蚀;同时,航煤中的非活性硫化物在生物和化学因素作用下转化成活性硫化物,这些活性硫化物除了硫化氢外,还包括元素硫、硫醇。操作上可以根据原料硫含量分析结果,对循环氢脱硫塔贫溶剂量和汽提塔的汽提蒸汽量进行调整,降低分馏系统硫化氢含量,保证航煤银片腐蚀合格。
Jinling Petrochemical 1.50Mt / a hydrocracking unit sand light straight-run wax oil and coker gas oil mixture of raw materials for the production of jet fuel, diesel, liquefied petroleum gas, light naphtha and heavy naphtha, the product program for the largest Production of high-quality middle distillates, but also to achieve more productive heavy naphtha process scheme. The device consists of reaction, fractionation, liquefied gas fractionation and desulfurization, light hydrocarbon recovery and gas desulfurization, solvent regeneration of five parts. The plant fractionation section is provided with a main stripper, a first fractionator, and a second fractionator. The first column of the fractionation section is the main stripper, which is stripped by steam at 3.5 MPa to allow the light naphtha component and a small amount of heavy naphtha to be withdrawn from the top of the stripper to minimize sulfur bottoms in the column Heavy naphtha and jet fuel products corroded. The device failed to corrode aeronautic silver flake when it was started for the first time after overhaul. The reason is that hydrogen sulfide is generated in the hydrogenation process and the hydrogen sulfide can not be removed from the product. The aviation fuel product contains 1 to 2 mg / kg of hydrogen sulfide It can lead to corrosion of grade 2 silver flake. At the same time, inactive sulfides in jet fuel are converted into active sulfides under the action of biological and chemical factors. In addition to hydrogen sulfide, these active sulfides also include elemental sulfur and mercaptans. Operation can be based on the results of the analysis of raw materials, sulfur content of the circulating hydrogen desulfurization tower lean solvent amount and the stripping steam stripping column to adjust the amount of hydrogen sulfide to reduce the fractionation system, to ensure the aviation coal silver corrosion qualified.