Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method

Kamariah  Md Isa; Kahar  Osman; Nik Rosli  Abdullah; Nor Fadzilah  Othman; Nurulnatisya  Ahmad

doi:10.37934/cfdl.12.10.111127

Authors

Kamariah Md Isa Faculty of Mechanical Engineering, Universiti Teknologi MARA Cawangan Johor, Kampus Pasir Gudang, Johor, Malaysia
Kahar Osman Sekolah Kejuruteraan Bioperubatan Dan Sains Kesihatan, Fakulti Kejuruteraan Universiti Teknologi Malaysia, Malaysia
Nik Rosli Abdullah Faculty of Mechanical Engineering Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
Nor Fadzilah Othman TNB Research Sdn. Bhd, Malaysia
Nurulnatisya Ahmad Faculty of Mechanical Engineering, Universiti Teknologi MARA Cawangan Johor, Kampus Pasir Gudang, Johor, Malaysia

DOI:

https://doi.org/10.37934/cfdl.12.10.111127

Keywords:

computational fluid dynamics, CFD, bubbling fluidised bed gasifier, low- rank coal gasification, gasifying agent

Abstract

Low-Rank Coal (LRC) gasification utilising Fluidised Bed Gasifier (FBG) is more efficient for LRC that has higher reactivity, moisture, tar, volatile, and ash content but lower calorific value compared to other types of coals. This work investigated the application of Computational Fluid Dynamics (CFD) in simulating LRC gasification under different temperatures which is lower (873K), normal (973K) and higher (1073K) temperature atmosphere. Besides that, the effect of LRC type and gasifying agents on the producer gas CO+H₂ composition, Lower Heating Value (LHV) and Cold Gas Efficiency (CGE) were also studied using High-rank Coal (HRC) as comparison. The results obtained showed that LRC gasification using oxygen increased LHV and CGE. Lower temperature gasification using oxygen at 873 increased CO+H₂, LHV and CGE for LRC compared to higher temperatures at 973K and 1073K. This prediction suggests that LRC gasification using oxygen at lower temperature increases the LRC gasification efficiency.