Fixed-bed pyrolysis of coal under hydrogen pressure at low heating rates

Coal pyrolysis in a fluidized bed reactor simulating the process conditions of coal topping in CFB boiler

“…Several research groups [20][21][22][23][24][25] reported an obvious increase of the pyrolysis oil yield with increasing the H 2 content in the reaction atmosphere, while others [14,26] found that the inclusion of H 2 decreased the pyrolysis oil yield, although it improved the quality of the pyrolysis oil. Table 3 compares the major literature reports and working conditions (including reactor type and heating rate) for investigating the influence of H 2 on pyrolysis oil yield.…”

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

“…1a where the recycled pyrolysis gas is burnt. There are some literature studies about the atmospheric-gas influence on coal pyrolysis [3][4][5][6][7][8][9][10][11][12]. Braekman-Danheux et al [4,5] studied the influence of coke oven gas components on product yields and char characteristics in a fixed bed reactor.…”

Investigation of the evolved gases from Sulcis coal during pyrolysis under N2 and H2 atmospheres

“…The char gasification is the rate-controlling step of the entire coal gasification process, therefore the progress of gasification reaction will depend upon the characteristics of char yielded during pyrolysis. The pyrolysis can also proceed under reductive atmosphere (hydropyrolysis) yielding more gas and liquid respect to inert one [6]. Moreover, sulfur and nitrogen present in raw coal will be volatilized in the early pyrolysis and hydropyrolysis stage with a consequent remarkable reduction of SO x and NO x emissions in the environment [7,8].…”