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Energies 2017, 10(2), 238; doi:10.3390/en10020238

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

1
Department of Earth Resources Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2
School of Energy Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454-003, Henan, China
3
Center of Environmental Science and Disaster Mitigation for Advanced Research, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan
4
Department of Information and Electronic Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan
5
Division of Sustainable Resources Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
6
Underground Resources Innovation Network, Kita 47 Higashi 17, Higashi-ku, Sapporo 007-0847, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Mehrdad Massoudi
Received: 7 January 2017 / Revised: 9 February 2017 / Accepted: 13 February 2017 / Published: 16 February 2017
View Full-Text   |   Download PDF [4832 KB, uploaded 16 February 2017]   |  

Abstract

Underground coal gasification (UCG) is a technique to recover coal energy without mining by converting coal into a valuable gas. Model UCG experiments on a laboratory scale were carried out under a low flow rate (6~12 L/min) and a high flow rate (15~30 L/min) with a constant oxygen concentration. During the experiments, the coal temperature was higher and the fracturing events were more active under the high flow rate. Additionally, the gasification efficiency, which means the conversion efficiency of the gasified coal to the product gas, was 71.22% in the low flow rate and 82.42% in the high flow rate. These results suggest that the energy recovery rate with the UCG process can be improved by the increase of the reaction temperature and the promotion of the gasification area. View Full-Text
Keywords: underground coal gasification; gasification efficiency; co-axial UCG system; acoustic emission underground coal gasification; gasification efficiency; co-axial UCG system; acoustic emission
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Hamanaka, A.; Su, F.-Q.; Itakura, K.-I.; Takahashi, K.; Kodama, J.-I.; Deguchi, G. Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System. Energies 2017, 10, 238.

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