Abstract
Refinery hydrogen consumers (i.e. hydrocracker, hydro-treater) are operated in high pressure. The makeup hydrogen and recycle hydrogen compressors are placed to increase the pressure of hydrogen streams. It leads to a large contribution on compression work and operating cost. Therefore, except for the minimizing the flowrate of hydrogen utility, it is extremely important to reduce the compression work when optimizing hydrogen network. The improved problem table is applied to locate the flowrate targets of hydrogen network with intermediate header in the first step. Next, a novel nearest neighbors algorithm as well as pressure-impurity diagram are proposed to design the optimal hydrogen network with intermediate header and minimum compression work. The proposed approach is illustrated via a case study. The results show that the optimal targets (11.89 MJ, 8 compressors) are much better than those reported (15.09 MJ, 11 compressors) in the literature. It indicates that intermediate hydrogen header can be installed to reduce the number of compressors as well as the compression work.
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