Abstract—Hydrogen is an important utility in the production of clean fuels as low-sulfur gasoline and diesel. The combination of low-sulfur fuel specifications and reduced production of hydrogen in catalytic reformers make hydrogen management a critical issue. In this paper, we propose a systematic approach for the retrofit design of these hydrogen network. The methodology is based upon mathematical optimization of a superstructure and maximizes the amount of hydrogen recovered across a site. The techniques account fully for pressure constraints as well as the existing equipment. The optimum placement of new equipment such as compressors and purification units is also considered. Total annual cost (TAC) and fresh hydrogen requied by the refinery are employed as the optimizing objects. Equations obtained from Superstructure method are solved with mixed-integer nonlinear programming (MINLP) of the General Algebraic modeling system (GAMS).The results of optimization showed the 28% reduction of hydrogen production in North section and 35.7% in south section of refinery hydrogen network. Also, addition a new hydrogen recovery unit will cuase 20% reduction in total costs of North section and 31.27% reduction in total costs of South section.
Index Terms—Hydrogen management, superstructure, MINLP, GAMS, optimization.
The authors are with the Department of Chemical Engineering, North Branch, Islamic Azad University, and Tehran, Iran (Corresponding Author: phone + (98 21 88787204); fax: + (98 21 88787204), e-mail: email@example.com, firstname.lastname@example.org; email@example.com, firstname.lastname@example.org) .
Cite: Mahyar Saleh, Zahra Firooz Jahantighy, Amir Sahand Gooyavar, Mohamad Samipourgiry, and Nasrollah Majidian, "Hydrogen Integration in Refinery Using MINLP Method," International Journal of Modeling and Optimization vol. 2, no. 2, pp. 83-86 , 2012.