首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Revamp study of crude distillation unit heat exchanger network: Energy integration potential of delayed coking unit free hot streams
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Revamp study of crude distillation unit heat exchanger network: Energy integration potential of delayed coking unit free hot streams

机译:原油蒸馏装置热交换器网络的改造研究:延迟焦化装置自由热流的能量整合潜力

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摘要

This work addresses the revamp study of the crude distillation unit (CDU) heat exchanger network (HEN) of a typical refinery with and without the consideration of the free hot streams available in the delayed coking unit (DCU). Based on pinch design method, two sub-cases of revamp study have been considered namely (a) installation of new heat exchangers for the entire network and (b) reutilization of existing heat exchangers. Based on the study, it has been evaluated that the revamp design of existing CDU HEN without considering the DCU free hot streams allows the enhancement of heat integration by 4.73% with respect to that available for the base case. On the other hand, the heat integration potential of DCU free hot streams is evaluated to enhance energy integration by 15.66% (with respect to the base case) with a simultaneous reduction of furnace duty by 37.1% and cooling water duties by 89.8%. Of various cases considered, the most attractive option corresponds to the partial revamp of CDU HEN along with DCU free hot streams that involve the reutilization of existing heat exchangers. The profitability analysis of this option concludes that the revamp design needs an additional investment of 2.68 M$ to enhance annual profit by 1.58 M$ with a payback period of 1.9 years. Thereby, the heat integration potential of DCU free hot streams is inferred to be significant and marks an important choice amongst different key revamp parameters associated to heat exchanger networks.
机译:这项工作着眼于在不考虑延迟焦化装置(DCU)中可用的自由热流的情况下,对典型精炼厂的原油蒸馏装置(CDU)热交换器网络(HEN)进行的改造研究。基于捏设计方法,已经考虑了两个子案例的改造研究,即(a)为整个网络安装新的热交换器,以及(b)重新利用现有的热交换器。根据这项研究,已经评估出,在不考虑无DCU热流的情况下,对现有CDU HEN进行的改造设计相对于基础案例而言,可使热集成度提高了4.73%。另一方面,对不含DCU的热流的热集成潜力进行了评估,以使能量集成提高15.66%(相对于基本情况),同时将炉负荷降低37.1%,将冷却水负荷降低89.8%。在所考虑的各种情况下,最有吸引力的选择是对CDU HEN进行部分改造,以及与DCU无关的热流,其中涉及对现有热交换器的再利用。该方案的获利能力分析得出的结论是,改造设计需要追加268万美元的投资,才能将年利润提高158万美元,投资回收期为1.9年。因此,推断无DCU的热流的热集成潜力非常大,并且标志着在与热交换器网络相关的不同关键改造参数中的重要选择。

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