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Biogasifying coal to methane represents an environmentally benign way to utilize the abundant and inexpensive coal resource. To increase methane yield from coal, numerous studies have investigated the approach of biostimulation through finding the best nutrient solutions to enhance microbial activities. Toward this end, however, almost all studies have adopted laboratory made medium that is tap water-...
Biogenic methane production from coal has been demonstrated to be a universal process at places where coal and a suitable microbial community co-exist. Through stimulating activities of in situ microbial communities, higher methane production rate can be achieved compared to those without biostimulation. However, it is commonly observed that upon stimulation either in situ or ex situ, methane production...
For the purpose of producing biocrude from pretreated and washed sweet sorghum bagasse, hydrothermal liquefaction (HTL) was conducted with six different catalysts at two temperatures. The six catalysts were: K2CO3, KOH, formic acid, Ni/SiAl, Ni2P and zeolite. The two temperatures were 300 and 350°C. Based on two selection criteria, high yield of biocrude and low yield of biochar, K2CO3, KOH, and Ni/SiAl...
This study was aimed at identifying the changes in coal storage and transport properties affecting gas production from coal-gas reservoirs, when treated with microbial consortia to generate/enhance production of methane. The work expanded on the technology of bio-conversion, first proposed in order to imitate the natural/microbial process of biogenic gasification leading to recharging coalbed methane...
This paper presents the soot temperature and KL factor for biodiesel, namely fatty acid methyl ester (FAME) and diesel fuel combustion in a constant volume chamber using a two-color technique. The KL factor is a parameter for soot concentration, where K is an absorption coefficient and proportional to the number density of soot particles, L is the geometric thickness of the flame along the optical...
This study focused on spray combustion of ultra low sulfur diesel (ULSD) fuel under low oxygen conditions with low temperature combustion (LTC) mode in an optically accessible constant volume combustion chamber. The ambient oxygen concentration was configured as 10% and 15% to achieve low flame temperature. The ambient gas temperature varied from 800K to 1200K. High speed imaging of OH* chemiluminescence...
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