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01-03-2016 | Original Article | Issue 1/2016

Biomass Conversion and Biorefinery 1/2016

Co-firing carbon dioxide-torrefied woody biomass with coal on emission characteristics

Journal:
Biomass Conversion and Biorefinery > Issue 1/2016
Authors:
Siva Sankar Thanapal, Kalyan Annamalai, Robert James Ansley, Devesh Ranjan

Abstract

Torrefaction is a pre-treatment technique that involves the partial pyrolysis (200–300 °C) of biomass in an inert environment to improve its fuel properties. Effect of co-firing CO2-torrefied mesquite and juniper (10 % on mass basis) with coal in a 30-kWt downfired burner was studied considering the grindability potential of CO2-torrefied biomass (60 % higher grindability than N2-torrefied biomass). It was observed that co-firing 10 % by mass of raw mesquite with coal reduced the NO x emission from 420 to 280 ppm (33 % reduction) for an equivalence ratio (ER) of 0.9. However, co-firing TB with coal reduced the NO x emission by 10 % when compared to base case NO x emission from combustion of pure powder river basin coal (PRB) coal. Carbon monoxide percentage in the flue gas increased when biomass was co-fired with coal. An inverse relation was observed between CO and NO x emissions due to NO x reducing potential of CO in the presence of fixed carbon. Combining the advantages of using a greenhouse gas CO2 for pre-treatment and potential of CO2-torrefied biomass in reducing emissions with improved grindability, proves co-firing torrefied biomass with coal is an efficient technique.

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