Global Energy-Optimization Of Hydrogen Network With Multi-Impurities

With the expanding scale of hydrogenation, hydrogen cost has become the second cost element of refinery, which is only less than crude oil costs. In china, the integrated hydrogen consumption of gasoline and diesel fuel hydrogenation process at around 1.2%, well above the 0.45% of the foreign hydrogen consumption, there is a considerable gap in terms of the hydrogen economy between china and foreign. To meet the growing demand for hydrogen while reducing the hydrogen costs and consumption had become a core requirement of refinery.This paper uses mathematical programming method optimized a refinery hydrogen system, and through adding the constraints of purification devices and complexity degree in the mathematical programming model, to make the mathematical planning analysis more comprehensive and simple. Added other properties of involving hydrogen flow, impurities and hydrogen compression to the model get the best way of hydrogen networks supply. Compared with the original network, the load of hydrogen production has decreased 28.88%, hydrogen utilization increased by 7.3%, improve the economic efficiency of the enterprise and make full use of the resource.This paper also monitoring hydrogen system’s operating data in a small refinery, and analysis the three aspects of hydrogen production, hydrogen consumption and hydrogen recovery. Aim at the issues which exist in the hydrogen system, such as the wasted of hydrogen-rich and underused PSA, we develop the appropriate optimization program, and proposed reasonable suggestions for operation improvement. The results show that use all the emission gas of diesel and gasoline hydrogenation unit to product hydrogen, and delivery the reformer hydrogen to PSA device will get the rehabilitation program which have less renovation project and more economic benefits. The hydrogen yield increase of 16.6%, effectively alleviate the shortage of hydrogen supply contradiction, promote the continuous improvement of gasoline and diesel fuel quality. The material consumption of hydrogen production reduced by 17.5%, achieved the purpose of energy-saving efficiency.