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The sulfur transformation during pyrolysis and gasification of Shenhua direct liquefaction residue was studied and the release of H 2 S and COS during the process was examined. For comparison, the sulfur transfer of Shenhua coal during pyrolysis and that of pyrolyzed char during gasification were also studied. The residue was pyrolyzed at 10°C /min to 950°C. During pyrolysis about 33.6% of...
The effects of iron and calcium compounds on NO emission during CZC (carbazole char) gasification under different O 2 concentrations have been investigated in a quartz tube fixed bed reactor. Temperature-programmed gasification was preformed to determine the influence of O 2 concentration and catalytic effects of iron and calcium on NO emission. The results show that the O 2 ...
The volatilization behavior of chlorine in three Chinese bituminous coals during pyrolysis and CO 2 -gasification in a fluidized bed reactor was investigated. The modes of occurrence of chlorine in raw coals and their char samples were determined using sequential chemical extraction method. The Cl volatility increases with increasing temperature. Below 600°C the Cl volatility is different,...
The CO 2 gasification of maceral chars was performed using CAHN TG-151 pressurized thermobalance under different conditions. The effect of mineral in macerals and catalyst on the gasification reactivity of maceral chars and the gasification kinetics were systematically investigated. The results showed that the apparent gasification rate of maceral chars depends on the temperature, pressure,...
Hydrothermal water treatments and supercritical (SC) water treatments of a lignite were performed to examine the feasibility of upgrading low-rank coals. The treatment below 400 o C was found to be effective enough to keep high gasification reactivity at high temperature, as well as to suppress spontaneous combustion. The pyrolysis and gasification behaviors of raw and pretreated coals were...
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