IJETSI

Title: DESIGN AND OPTIMIZATION OF PERFORMANCE OF A BENCH SCALE GASIFIER FOR SUB-BITUMINOUS COAL
Authors: Stellamaris N. Nzove , Hiram Ndiritu and Benson Gathitu
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Stellamaris N. Nzove1* , Hiram Ndiritu2 and Benson Gathitu2 1,2. Department of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology, Kenya, P.O. BOX 62000-00200 Nairobi. 3. Department of Agricultural and Bio-Systems Engineering, Jomo Kenyatta University Agriculture and Technology, Kenya, P.O. BOX 62000-00200 Nairobi.
MLA 8 Nzove, Stellamaris N., et al. "DESIGN AND OPTIMIZATION OF PERFORMANCE OF A BENCH SCALE GASIFIER FOR SUB-BITUMINOUS COAL." IJETSI, vol. 3, no. 5, Oct. 2019, pp. 246-260, ijetsi.org/more2019.php?id=20. Accessed Oct. 2019. APA Nzove, S., Ndiritu, H., & Gathitu, B. (2019, October). DESIGN AND OPTIMIZATION OF PERFORMANCE OF A BENCH SCALE GASIFIER FOR SUB-BITUMINOUS COAL. IJETSI, 3(5), 246-260. Retrieved from ijetsi.org/more2019.php?id=20 Chicago Nzove, Stellamaris N., Hiram Ndiritu, and Benson Gathitu. "DESIGN AND OPTIMIZATION OF PERFORMANCE OF A BENCH SCALE GASIFIER FOR SUB-BITUMINOUS COAL." IJETSI 3, no. 5 (October 2019), 246-260. Accessed October, 2019. ijetsi.org/more2019.php?id=20.
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Abstract: In this research a bench scale gasifier was designed, fabricated and its performance analyzed. The main objective of the research was to develop and optimize the performance of a fluidized bed coal gasifier for production of syngas that can be utilized for power generation. Air flow rate during the gasification process was varied and the reactor temperature and gas composition were measured at each flow rate. Results from this research showed a reduction in carbon monoxide (CO) concentration with increase in airflow rate from 1.0 to 2.5 m3 /min. CO reduction was attributed to fact that more air enhanced conversion of CO to CO2. As the air flow rate was increased from 1.0 to 2.5 m3 /min, the calorific value of the syngas produced was observed to decrease from 5.667 to 4.106 MJ/Nm3 . This was attributed to the reduction of CO and the increase of nitrogen composition which do not add to the calorific value of the syngas. The optimal equivalence ratio ranged between 0.282 and 0.284. The cold gas efficiency (CGE) and the carbon conversion efficiency of the bench scale gasifier at optimal conditions was 64.29 % and 89.89% respectively.

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