Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

The Effect of Atmosphere on Elemental Mercury Release During Thermal Treatment of Two Bituminous Coals

“…Generally, CO 2 can be produced as part of volatile matter during coal pyrolysis. 37,38 Also, the result of MS verifies the production of CO 2 during pyrolysis of the coals. The CO 2 release behavior during thermal treatment of two coals under N 2 is shown in Figure 3.…”

“…Theoretically, coal pyrolysis is a complex chemical reaction and CO 2 gas is part of the reaction product. 37 When the additional CO 2 is introduced into the reaction system, it inhibits the reaction to a certain degree according to the theory of chemical reaction balance, leading to the decrease of the volatile matter produced during coal pyrolysis. Consequently, Hg 0 as part of volatile matter or reaction product during coal pyrolysis is also inhibited, resulting in a lower Hg peaks than that under N 2 .…”

Study on the formation of phenols during coal flash pyrolysis using pyrolysis-GC/MS

“…Tremendous efforts have been devoted to study coal pyrolysis and its product distribution [3][4][5][6][7], including the characterization of composition and mass distribution of coal-derived liquids [8][9][10], in which high value-added chemicals, especially phenolic compounds, have been separated. However, most of the studies on characterizing products of coal pyrolysis have been performed indirectly by collecting coal tar [1,3,4,9]. Meanwhile, some in-situ studies have been reported [10][11][12][13][14].…”

Characterization of char from high temperature fluidized bed coal pyrolysis in complex atmospheres

“…Our group has used the so-called vertical rectangular carbonization furnace, coupled with the fractionated pyrolysis process (Zhong et al, 2012), to upgrade low rank coal and produce char that may be employed to obtain both calcium carbide and syngas. In this process, the generated pyrolysis gases are returned to the lower portion of the furnace to increase the gas combustion rate and elevate the char yield.…”

“…The present report presents additional information from these studies concerning variations in char structure with pyrolysis conditions and the effects of such conditions on the char oxidation reactivity. In the present study, char samples from the same pyrolysis tests reported previously (Zhong et al, 2012) were characterized in detail using thermogravimetric analysis (TGA), Brunauer-Emmett-Teller measurements, (BET), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy. …”