G. Lăzăroiu, T. Frenţiu, L. Mihăescu, A. Mihaltan, M. Ponta, M. Frentiu, E. Cordos, The Synergistic Effect in Coal/Biomass Blend Briquettes Combustion on Element Behaviour in Bottom Ash using ICP-OES, J Optoelectron. Adv. Mater., 11 (2009) 713 – 721

Title: The Synergistic Effect in Coal/Biomass Blend Briquettes Combustion on Element Behaviour in Bottom Ash using ICP-OES

Abstract: This paper focuses on the study of the synergistic effect in coal/biomass blend briquettes combustion on behavior of Al, As,Ba, Cd, Co, Cr, Cu, Fe, Ga, K, Mn, Mo, Ni, P, Pb, Si, V, W, Zn, Zr and characterization of raw materials and bottom ashes. The manufacturing of coal/biomass briquettes although not commonly used is an attractive approach, as briquettes combustion is more technologically advantageous than the fluidized bed combustion. In the same time this technology is a way to render valuable materials of low calorific power and results in diminishing polluting emission. Raw materials and briquettes from different blends of pitcoal/sawdust were subjected to combustion in a 55 kW-boiler. The total content of elements after digestion in the HNO3 – HF mixture and the content in water leachate at a solid/liquid ratio of 1:2 were determined both in raw materials and bottom ash by ICP-OES. The total content of elements was higher in pitcoal than in sawdust. The synergistic effect depends both on coal/biomass ratio in blend and element nature. The water leachable fraction of elements from ash decreased along with the increase of sawdust weight excepting macronutrients (K, P) and Si.

Keywords: Coal/biomass briquettes, Bottom ash, ash leaching, Optical emission spectrometry