The temperature-dependent release of volatile inorganic species from Victorian brown coals and German lignites under CO2 and H2O gasification conditions

Effect of reactant types (steam, CO 2 and steam + CO 2 ) on the gasification performance of coal using entrained flow gasifier

“…A significant char restructuring under steam gasification helps to increase CCE 32 . In steam gasification, hydrogen radical induces condensation reaction within the char structure, which leads to altering the char morphology 33 . Furthermore, the fundamental steam gasification reaction is catalysed by the highly dispersed catalytic species (ie, Ca, Mg) because of the transformation of the aromatic ring into the large structure by the condensation reaction 31,34 .…”

“…32 In steam gasification, hydrogen radical induces condensation reaction within the char structure, which leads to altering the char morphology. 33 Furthermore, the fundamental steam gasification reaction is catalysed by the highly dispersed catalytic species (ie, Ca, Mg) because of the transformation of the aromatic ring into the large structure by the condensation reaction. 31,34 With the presence of catalytic species and oxygen, the gasification reactivity and thus, the consumption of carbon from char structure increases by lowering the activation energy and increasing the frequency factor.…”

Correlations between Coal Compositions and Sodium Release during Steam Gasification of Sodium-Rich Coals

“…1,25 During steam gasification of Victorian coal, Tanner et al found that the SR was related to inherent Na in coal. 26 This means that a higher content of Na in coal may lead to a larger SR.…”

Effects of coal drying on the pyrolysis and in-situ gasification characteristics of lignite coals

“…The raw materials used in coal gasification include lignite coal, bituminous coal, anthracite coal, etc. Recently, lignite coal is getting more and more attentions all over the world due to the overdeveloping of bituminous coal and anthracite coal [3][4][5]. Ahmed and Gupta conducted pyrolysis and gasification experiments of a lignite coal in a semi batch reactor at reaction temperatures of 800-950°C, and they conducted the simulation of syngas evolution during pyrolysis using first order, single step mechanism and the FLASHCHAIN mechanism, respectively [3].…”

“…Utilization of lignite coal were novelly applied in the fields of carbon fuel cell [6] and co-combustion/co-gasification of coal and biomass [7,8]. Nevertheless, lignite coals were usually dried in an oven at 105°C under nitrogen before the thermal reaction experiments at high temperatures in most of these researches [3][4][5][6][7][8], and the effects of water in coals on the reaction characteristics were not considered. As a young coal, lignite coal usually contains high volatiles (30-50 wt.%, dry basis) and moisture contents (20-55 wt.%, as received basis), [9][10][11][12] and the moisture contents in some lignite coals can even reach $70 wt.% (as received basis) [13].…”