Optimization of an auto-thermal ammonia synthesis reactor using cyclic coordinate method

29th Symposium of Malaysian Chemical Engineers 2016

Nguyen, T.A.-N.^1 ; Nguyen, T.-A.^2 ; Vu, T.-D.^2 ; Nguyen, K.-T.^2 ; Dao, T.K.-T.^2 ; Huynh, K.P.-H.^2

Faculty of Applied Science, Ton Duc Thang University, 19 Nguyen Huu Tho Str., District 7, Ho Chi Minh City, Viet Nam^1

Faculty of Chemical Engineering, Ho Chi Minh City University of Technology, District 10, Ho Chi Minh City, Viet Nam^2

关键词: Ammonia synthesis system;    Coupled differential equations;    Cyclic coordinate method;    Golden section method;    Multivariable functions;    Multivariable optimization;    Optimization problems;    Simulation and optimization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012059/pdf
DOI  :  10.1088/1757-899X/206/1/012059

来源: IOP

【 摘 要 】

The ammonia synthesis system is an important chemical process used in the manufacture of fertilizers, chemicals, explosives, fibers, plastics, refrigeration. In the literature, many works approaching the modeling, simulation and optimization of an auto-thermal ammonia synthesis reactor can be found. However, they just focus on the optimization of the reactor length while keeping the others parameters constant. In this study, the other parameters are also considered in the optimization problem such as the temperature of feed gas enters the catalyst zone, the initial nitrogen proportion. The optimal problem requires the maximization of an objective function which is multivariable function and subject to a number of equality constraints involving the solution of coupled differential equations and also inequality constraint. The cyclic coordinate search was applied to solve the multivariable-optimization problem. In each coordinate, the golden section method was applied to find the maximum value. The inequality constraints were treated using penalty method. The coupled differential equations system was solved using Runge-Kutta 4th order method. The results obtained from this study are also compared to the results from the literature.