Syngas Compositions And Kinetics Of South Kalimantan Lignite Coal Char Gasification With Steam

¹ Department of Mining Engineering, Faculty of Science and Engineering, Nusa Cendana University, Indonesia
² Department of Chemical Engineering, Faculty of Engineering, Gadjah Mada University, Indonesia

^* Corresponding author: yusufrumbino70@gmail.com

Abstract

The aim of this research was to investigate the gasification of a South Kalimantan lignite coal char in the temperature range of 873-1073 ºK and steam condition to evaluate the reactions rates and the product gas compositions. Prior to the gasification experiments the raw char was pyrolysed under nitrogen atmosphere and at a temperature of 673 ºK. The gasification experiments were conducted in a fixed bed reactor, at atmospheric pressure, isothermal conditions, equipped with cooling system, gas reservoir, and temperature control. Char from coal pyrolysis weighed then gasified at variations of temperature. Gas sampling is done every 15 minutes intervals for 90 minutes. The reactivity study was conducted in the kinetically controlled by the heterogeneous reaction between solid carbon from the char and a gas phase reagent. Two theoretical models were tested to fit the experimental data and the kinetic parameters were determined. It was found that an increase in temperature enhances the reaction rate and also the formation of H₂, CO, CH₄, and CO₂. The results show that higher temperature contributes to more hydrogen production The gasification kinetics was suitably described by the Random Pore Model. Activation energy determination of char gasification reactions by using Arrhenius graph.