Simulation of Improved Design for Ammonia Plant Front End Waste Heat Boilers

International Journal of Chemical Engineering Research
© 2021 by SSRG - IJCER Journal
Volume 8 Issue 1
Year of Publication : 2021
Authors : Agu Kingsley Chidozie, Oduola Mujeeb Koyejo
How to Cite?

Agu Kingsley Chidozie, Oduola Mujeeb Koyejo, "Simulation of Improved Design for Ammonia Plant Front End Waste Heat Boilers," SSRG International Journal of Chemical Engineering Research, vol. 8,  no. 1, pp. 5-14, 2021. Crossref,


This paper is focused on the improved design of an ammonia plant front-end waste heat boilers. The study covered the initial design, the failure rate, and causes over a given period of time. The initial design is a set up of two bayonet tube exchangers and a straight fixed tube exchanger vertically inclined, which is prone to failure primarily because of the configuration, while the improved design is a single floating head exchanger horizontally inclined. The improved designs and their functionality have been analyzed as regards the ammonia plant understudy, and cost-effectiveness evaluated. The properties and conditions of the front end section at various rates were used to simulate the improved design via Aspen HYSYS. The improved design at 70%, 80%, 90% and 100% front end rate gave heat duties of 6.578e+08kJ/hr,8.095e+08kJ/hr, 8.188e+08kJ/hr and 9.787e+08kJ/hr respectively. When compared to the heat duties of the present design under similar conditions, the heat duties of the improved design were higher at the different front-end rates showing higher efficiency. Thus, the single improved exchanger with a quite low failure rate can comfortably replace the three front-end waste heat boilers and, in turn, increase throughput and drastically drop overhead running cost.


ammonia plant, aspen hysys, process design, logistic regression modeling, waste heat boilers.


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