Reference : Energy savings in methanol synthesis: Use of heat integration techniques and simulati...
Scientific journals : Article
Engineering, computing & technology : Energy
Engineering, computing & technology : Chemical engineering
Energy savings in methanol synthesis: Use of heat integration techniques and simulation tools.
Maréchal, François [Université de Liège - ULiège > Chimie appliquée > LASSC > >]
Heyen, Georges [Université de Liège - ULiège > Département de chimie appliquée > LASSC (Labo d'analyse et synthèse des systèmes chimiques) >]
Kalitventzeff, Boris [Université de Liège - ULiège > Services généraux (Faculté des sciences appliquées) > Relations académiques et scientifiques (Sciences appliquées) >]
Computers & Chemical Engineering
Pergamon Press - An Imprint of Elsevier Science
Suppl. S
Yes (verified by ORBi)
United Kingdom
[en] Starting with a classical process for producing methanol using the reforming and synthesis steps, a combined approach applying simulation models and a new synthesis strategy, named Effect Modelling and Optimisation (EMO), has been used to optimise the energy efficiency of the process. The method allows to identify different ways of improving the energy efficiency of the process. The modifications concern the synthesis reactor and the reforming reactor designs, the exploitation of the purge stream as fuel gas to satisfy the process requirement and its integration to a gas turbine system. The EMO approach allows to target the impact of a process modification at the global level of the energy cost of the process, including the combined production of heat and mechanical power in a gas turbine and the steam network. Starting with a classical methane conversion of 60% for the classical system, we identify solutions with up to 93% of the overall methane conversion when we transform the net mechanical power produced into methane savings at the country level. The interest of the approach is the possibility of computing the impact of the process modifications suggested by the analysis of the shape of the heat cascade on the overall energy balance of the plant without having to simulate in many details the steam and the heat exchanger network.

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