Effect of hydrogen-rich gas from char gasification on rapid pyrolysis products of low rank coal in a downer pyrolyzer

Abstract

Simulated coal gas from char gasification played a different role at different temperature (550–700 °C) during coal pyrolysis.

Thermal Conversion of Sugarcane Bagasse Coupled with Vapor Phase Hydrotreatment over Nickel-Based Catalysts: A Comprehensive Characterization of Upgraded Products

“…Under the H2 atmosphere process, there was a higher proportion of sugar-derived molecules, whereas under the inert atmosphere process, the alcohols had a higher relative content. We propose, for this result, that the H2 in the noncatalytic hydropyrolysis process provided a better stabilization of the radicals formed during the cracking of the biomass macromolecules (cellulose, hemicellulose, and lignin) [39]. As a result of the stabilization of the sugar derivatives (formed mainly from the thermal decomposition of cellulose), a restriction on the occurrence of secondary reactions was promoted during the process, resulting in the partial inhibition of the secondary reactions of cleavage and dehydration of these molecules to form alcohols.…”

Effects of CO2 atmosphere on low-rank coal pyrolysis based on ReaxFF molecular dynamics

“…The direct combustion of low-rank coal will lead to low energy efficiency, high pollutant emissions and waste of high value components in volatiles. 3 Pyrolysis is an effective coal conversion technology and the initial reaction step of most coal utilization processes. The poly-generation technology based on coal pyrolysis can produce pyrolysis gas with high heat value, upgraded coal tar, clean solid fuel coke and other high-value products to realize multi-level and efficient utilization of coal resources.…”