降低焦炭塔操作压力对焦化过程的影响

考察了降低焦炭塔操作压力对延迟焦化过程的影响。中试结果表明：在炉出口温度、注汽量、循环比等操作条件基本一致的情况下，当焦炭塔的操作压力由0.195MPa降低到0.115MPa时，气体和焦炭的产率降低，液体产品收率提高且表现在焦化蜡油收率的提高上，二者分别提高了2.03百分点和4.64百分点；随着操作压力的降低，焦化汽油和焦化柴油的性质基本一致，但焦化蜡油性质变差，主要表现在密度、残炭、沥青质、氮含量及金属等均有所升高，95%馏出温度提高14℃；石油焦的挥发分呈降低趋势。

EFFECT OF REDUCING OPERATING PRESSURE ON COKING PROCESS

The effect of reducing operating pressure on delayed coking process was studied. The pilot test results showed the yield of liquid and gas oil increased by 2.03 and 4.64 percentage points, respectively, while the yield of gas and coke decreased when the operating pressure of coker drum was reduced from 0.195MPa to 0.115MPa under the basically same conditions of the outlet temperature of delayed coking furnace, steam injection amount and recycle ratio. With the decrease of operating pressure, the properties of coker gasoline and coker diesel oil changed little, but coking gas oil properties became worse, mainly in increases of density, carbon residue asphaltene and nitrogen content, metal content, while the distillation range 95% point temperature increased by 14℃and the volatile component decreased.