低循环比条件下的延迟焦化技术分析
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摘要
对中国石化洛阳分公司延迟焦化装置采取低循环比操作技术后的效果与存在的问题进行分析,并提出解决措施。采取低循环比操作后,焦化装置的液体产品收率和渣油加工能力均提高,同时装置的综合能耗降低,但存在加热炉结焦倾向增大、分馏塔塔底结焦、设备超负荷运行等问题。通过渣油进装置在线密度仪实时检测原料性质变化,根据原料性质变化及时调整循环比和加热炉炉管注汽量等,可改变渣油在炉管内的流动状态,避免加热炉炉管结焦;通过优化分馏塔塔底换热流程,增大循环油的流动性,可以减缓分馏塔塔底结焦;通过在小吹汽、大吹汽等阶段对分馏塔提前操作,可减弱低循环比操作对分馏塔的影响;通过增加循环油并入蜡油出装置流程,可解决低循环比操作下分馏塔塔底循环油去向问题,增大分馏塔平稳操作的灵活性。
The low recycle ratio operation has been adopted on delayed coking unit in SINOPEC Luoyang Company recently.The results showed that the liquid yield and unit throughput are increased by 3.57 and 30 percentage points,respectively and energy consumption is reduced by 41.03%.Meanwhile several measures,including real-time detection of feed properties,adjustment of the recycle ratio and steam amount for heater,and optimization of the heater exchange process of the distillation tower,have been provided to solve the problems arose from the lower recycle ratio operation,such as the coking in furnace pipes and at the bottom of fractionator.
The low recycle ratio operation has been adopted on delayed coking unit in SINOPEC Luoyang Company recently.The results showed that the liquid yield and unit throughput are increased by 3.57 and 30 percentage points,respectively and energy consumption is reduced by 41.03%.Meanwhile several measures,including real-time detection of feed properties,adjustment of the recycle ratio and steam amount for heater,and optimization of the heater exchange process of the distillation tower,have been provided to solve the problems arose from the lower recycle ratio operation,such as the coking in furnace pipes and at the bottom of fractionator.
引文
[1]陈奎.延迟焦化装置技术改造方案的选择[J].石油化工设计,2006,23(2):27-30
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[4]翟志清,杨志强.掺炼塔河油减渣对延迟焦化装置长周期运行的影响和措施[J].河南化工,2006,26(7):51-54
[5]郭书涛.焦化炉Cr5Mo炉管高温损伤和剩余寿命预测[D].杭州:浙江工业大学,2008
[2]王航空,肖知俊,成林,等.稠油延迟焦化装置提高汽油柴油收率的措施[J].炼油技术与工程,2009,39(3):21-23
[3]侯芙生.发挥延迟焦化在深度加工中的作用[J].当代石油石化,2006,14(2):3-12
[4]翟志清,杨志强.掺炼塔河油减渣对延迟焦化装置长周期运行的影响和措施[J].河南化工,2006,26(7):51-54
[5]郭书涛.焦化炉Cr5Mo炉管高温损伤和剩余寿命预测[D].杭州:浙江工业大学,2008