Characteristics of entrained flow coal gasification in a drop tube reactor

Evolution of syngas from cardboard gasification

“…The general trend of increase in the steam to sample ratio is to increase the yield of total syngas, H 2 , and CO 2 , while CO and CH 4 yields decreases [5][6][7][8][9][10]. The increase in H 2 and CO 2 yield and the decrease in CO yield are attributed to the acceleration of the forward reaction rate of the water gas shift reaction (CO þ H 2 O () CO 2 þ H 2 ) [5,[7][8][9][10].…”

“…The increase in H 2 and CO 2 yield and the decrease in CO yield are attributed to the acceleration of the forward reaction rate of the water gas shift reaction (CO þ H 2 O () CO 2 þ H 2 ) [5,[7][8][9][10]. On the other hand the increase in steam to sample ratio increases the methane reforming reaction to cause a reduction in the yield of methane [6].…”

Pressurized drop tube furnace tests of global coal gasification characteristics

“…The results of another DTF gasi"cation experiment at atmospheric pressure (Lee et al, 1996) is also illustrated, which was performed with Roto coal in di!erent experimental conditions (particle size of 11}20 m, temperature of 15003C, residence time of 4.8 s). The value of Figure 3.…”

“…Therefore, it is essential to accumulate the information on the gasi"cation characteristics at elevated pressure before attempting to analyse, design and simulate the commercial gasi"er because the reaction characteristics of coal gasi"cation process are dependant on the coal type and the condition of operation. From the existing literature, information on coal gasi"cation characteristics at atmospheric pressure can be found (Abd El-Samed et al, 1990;Badzioch and Hawksley 1970;Brown et al, 1985;Lee et al, 1996;Nsakala et al, 1982;Skinner et al, 1980), but relatively little is available at elevated pressure (Ahn et al, 1996;Kajitani et al, 1996;Ouyang et al, 1998;Suuberg et al, 1979). Moreover, information on the gasi"cation characteristics is available only for the selected coal types.…”

Transient gasification and syngas formation from coal particles in a fixed-bed reactor

“…For example, in the study of Lee et al (1996), coal gasification in an entrained flow by means of a drop tube reactor was performed. Their results indicated that the H 2 /CO ratio decreases with increasing reaction temperature and a maximum distribution in syngas concentration is exhibited around ash fusion temperature.…”