Simulation and Analysis of an Alkaline Electrolysis System for Hydrogen Production using ASPEN Plus Model

Abstract

A semi-empirical mathematical model is presented in this work to predict the electro-chemical behaviour of an alkaline water electrolysis system. It is based on the polarisation curve and Faraday performance characteristics and takes into account factors such as temperature, pressure variations, and current density. Low hydrogen impurity levels and small voltage variations are shown by evaluation, showing good agreement with real data. The model helps with the design and optimisation of electrolyzers, and sensitivity analysis helps discover important operational aspects. It also suggests a thorough model that combines plant and stack stability that was created with Aspen Custom Modeller without the need for coding expertise. The study suggests a temperature rise and a pressure drop for improved system capacity, with an emphasis on using parametric research and simulations to maximise hydrogen generation efficiency and plant stability.