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/cm(2) with Jatropha curcas seeds and starch mixture as binding agents. Desulfurization was performed within a temperature range of 300 to 500 degrees 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 degrees C. Moreover, the highest reaction rate constant of desulfurization was 0.280 min(-1).