Optimization Approach for Continuous Catalytic Regenerative Reformer Processes

Abstract

The new approach for simulation and optimization of a continuous catalytic regenerative (CCR) reformer process is proposed. Typical CCR reforming processes consist of three to four reactors with recycle. The reaction patterns and reactors are typically modeled using a system of partial differential equations (PDEs). The numerical simulation solution of the entire model for a process system consisting of multiple reaction zones with recycle is extremely time-consuming and, thus, impractical in optimization studies. That is why we proposed a more efficient simulation and optimization scheme based on quasi-steady-state assumptions. We define criteria for reactor fragmentation to avoid the introduction of large errors in the quasi-steady-state calculations. The optimization problem is formulated with the objective of minimizing fuel consumption. The employed objective function constitutes a combined measure for economic and environmental performance. It is shown that the proposed approach identifies considerable improvements for the process.

Toward enhanced hydrogen production in a catalytic naphtha reforming process

“…The configuration of the conventional CCR process, as illustrated in Fig. 5, is adopted from our earlier work [30], which presents the mathematical model and an optimization procedure for the CCR process. This mathematical model is used to simulate the conventional CCR process, while the optimization procedure is adapted to determine optimal settings for the controlled variables, so as to maximize hydrogen production.…”

“…The kinetic model reported by Stijepovic et al [29,30] is employed to describe the reforming reactions in this study.…”

“…Moreover, several articles studied the effects of coupling exothermic processes with CNR process, so as to optimize process performance [36,40]. Stijepovic et al [30] reported a study for the optimization of a CCR process, and identified economic improvements whilst meeting more stringent environmental constraints. In this paper, we explore all elements of CNR research and development, namely kinetics, reactor design and optimization, in order to develop a process concept that outperforms the conventional CCR process in terms of enhanced hydrogen and aromatics production, enhanced reformate yield, and decreased production of light gases.…”

Simultaneous hydrogen and aromatics enhancement by obtaining optimum temperature profile and hydrogen removal in naphtha reforming process; a novel theoretical study

“…A semi-regenerative naphtha reformer has been modeled and its operating conditions have been optimized by Li et al [9]. Economic and environmental aspects have been considered in an objective function defined by Stijepovic et al [10] in a new simulation and optimization for conventional naphtha reforming reactors. Weifenget al [11] have suggested a multi objective optimization process to enhance aromatics production rate.…”

Modeling and energy optimization of the catalytic naphtha reforming process

“…Tokom izrade teze detaljno su razmatrani načini definisanja veličina reakcionih zona [92], koje se uvedene podelom katalizatora na slojeve u aksijalnom i radijalnom pravcu. U radijalnom pravcu slojevi su određeni na bazi temperaturnog profila, što se opravdava činjenicom da formiranje koksa zavisi od koncentracija vodonika i alkilciklopentana.…”