Application of stage condensation of tar during pyrolysis of high ash semi-bituminous-Morupule mine coal

Leonard Akofang, Paul Serban Agachi

Research output: Contribution to journalArticlepeer-review

Abstract

Botswana high-ash semi-bituminous coal produced by Morupule mine is under-utilized due to a lack of knowledge in possible applications of derivative products such as tar, syngas, and charcoal. This study is aimed to determine the possibility of producing tar as the main product via stage condensation in a semi-batch pyrolysis plant. A conventional process that incorporates fractional distillation to refine tar makes the low-quality coal uneconomical for coal to tar
application because of high energy requirement. Raw and washed peas density medium separated at 50 % yield (DMS 50 %) Morupule coal was used for pyrolysis at 500 °C and connected to 3 condensers set to 150 °C, 80 °C, and 25 °C, respectively. The average tar yield from raw coal was about 1% and about 2.4-2.6 % in washed peas coal. Washed coal had the highest oil yield of about 2.5% as compared to the average of about 1% in raw coal. Both yields are extremely
low to be considered for commercial pyrolysis (targeting tar as the main product), however, no pyrolysis product goes to waste. If all products (syngas, charcoal, and tar/oils) were marketed, the process would have the potential to become profitable.
Original languageEnglish
Pages (from-to)4-10
Number of pages7
JournalDRC sustainable Future
Volume2
Issue number1
Publication statusPublished - May 5 2021

Fingerprint

Dive into the research topics of 'Application of stage condensation of tar during pyrolysis of high ash semi-bituminous-Morupule mine coal'. Together they form a unique fingerprint.

Cite this