Hydrogen consuming units in refineries are operated in high pressure

thus some makeup hydrogen and recycle hydrogen compressors are utilized to increase the pressure of hydrogen streams. It leads to a large increase 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. In this paper

based on the concept of the nearest neighbors algorithm

pressure constraints are taken into consideration

a novel nearest neighbors algorithm as well as pressure-impurity concentration diagram are proposed to design hydrogen network with minimum compression work. The results for the case study show that the minimum compression work achieves 16.435 MJ

and the number of compressor is nine which is two less than that in the literature.