Sulfur removal in bio-briquette combustion using seashell waste adsorbent at low temperature

Presently,biomass is mostly utilized as co-fuel in coal combustion in view of energy diversification and emission reduction. however,since the coal content of bio-briquettes is high (up to 80% in this study),gas emissions such as those of sox still occur. therefore,the introduction of so2 adsorbent is common in coal briquette or bio-briquette combustion. a calcium-based material is usually used for this goal. the aim of this study was to observe the effects of desulfurization temperature and ca/s ratio (ca = calcium content in adsorbent; s = sulfur content in coal and biomass) on desulfurization efficiency and kinetics. the ratio of coal to biomass (palm kernel shell/pks) was fixed at 90:10 (wt/wt) and the ratios of ca to s were varied at 1:1,1.25:1,1.5:1,1.75:1 and 2:1. the mixtures of coal,pks and adsorbent were briquetted at a molding pressure of 6 ton/cm2 with jatropha curcas seeds and starch mixture as binding agents. desulfurization was performed within a temperature range of 300 to 500°c for 720 seconds at an airflow rate of 1.2 l/min. the results showed that the highest desulfurization efficiency (90.6%) was associated with the ca/s ratio of 2:1 and temperature of 400°c. moreover,the highest reaction rate constant of desulfurization was 0.280 min-1. ©2016 published by itb journal publisher.