CO2 integration in high temperature steam gasification (HTSG) of solid fuels and blends with waste

Abstract

Aim of the present work is to investigate the viability of modifying the high temperature steam gasification process by adding CO2 in an attempt to tailor value added gas suitable for the energy - chemicals production industry. Such an integrated process investigates the concepts of high temperature steam gasification (HTSG) with aspects from steam gasification under a rich in CO2 atmosphere(CO2HTSG). The present study aimed at investigating the beneficial or detrimental effect of modifying the existing HTSG atmosphere by partially recycling CO2 in lab scale and ideally emerging from a conventional CO2 production process. The effect of the process parameters on the producer gas quality, char and tar yields when gasified non-food woody biomass (WB) of forest origin, swedish coal (SC) and pre-treated plastic waste (PW) studied, as well as their weak blends. Results of the present study indicated synergies when materials of lignocellulosic origin with coal are co-gasified under high temperature/steam conditions, while the modified with CO2 steam gasification environment and at elevated temperature did affect also the quality of the producer gas. This effect depends on the feeding properties and steam gasification conditions, It seems that gasification at elevated temperature with steam-carbon-dioxide decreased the reactivity of chars however blending with biomass at low percentages maximized the H2 and CO2 production. © 2016 ETA-Florence Renewable Energies.