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Purification of Synthetic Gas from Fine Coal Waste Gasification as a Clean Fuel
Muhammad Faizal 1  
,   Muhammad Said 1  
,   Enggal Nurisman 1,   Nabila Aprianti 1, 2  
 
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1
Chemical Engineering Department, Faculty of Engineering, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih KM 32 Indralaya, Ogan Ilir, Sumatera Selatan 30662, Indonesia
2
Doctoral Program of Environmental Science, Graduate School, Universitas Sriwijaya, Jl. Padang Selasa No.524, Palembang 30139, South Sumatra, Indonesia
CORRESPONDING AUTHOR
Muhammad Faizal   

Chemical Engineering Department, Faculty of Engineering, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih KM 32 Indralaya, Ogan Ilir, Sumatera Selatan 30662, Indonesia
Publication date: 2021-05-01
 
J. Ecol. Eng. 2021; 22(5):114–120
 
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ABSTRACT
The presence of CO2 in the syngas is attracting more attention in terms of reducing the greenhouse gas emissions in its utilisation. The aim of this study was to purify syngas from the CO2 content of fine coal gasification. Fine coal is gasified with and without absorption using CaO, which is hydrated to Ca(OH)2 in the modified updraft gasifier at 450-700 °C. Apart from investigating the CO2 absorption process, the gasification process also evaluates the influence of temperature in terms of its synergy with Ca(OH)2. The best conditions for the gasification process are achieved at 700 °C. The content of CO2 was proven to be well absorbed, which is characterised by a decrease in the CO2 content and an increase in H2 in syngas. After the absorption process, the H2 content obtained increased from 42.6 mole% to 48.8 mole% of H2 at 700°C. The H2 ratio also increased after absorption to 2.57 from the previous value of 2.23. The highest absorption efficiency of CO2 by Ca(OH)2 occurred at 700°C at 50.63%. With an increase in temperature in the gasification process with absorption, the CO2 content decreased dramatically from 16.9 mole% to 3.9%. Ca(OH)2 has good absorption power at CO2 at high temperatures.