Influences of Waste Iron Residue on Combustion Efficiency and Polycyclic Aromatic Hydrocarbons Release during Coal Catalytic Combustion

Linbo Qin,Jun Han,Yajie Zhang,Wangsheng Chen

doi:10.4209/aaqr.2015.04.0227

Abstract

Effects of adding waste iron residue on the combustion efficiency and the removal of Polycyclic Aromatic Hydrocarbons (PAHs) during coal combustion were investigated in a laboratory scaled drop tube furnace at a temperature range of 950–1250°C. The experimental results indicated that adding 0.5% waste iron residue had a good performance on enhancing combustion efficiency during coal combustion. Meanwhile, the addition of 0.5% waste iron residue was also favor for reducing PAHs emission as well as PAHs TEQ concentrations during coal combustion at a temperatures range of 950–1250°C. With adding 0.5% waste iron residue (WIR), the coal combustion efficiency was enhanced by 6.15%, and the total PAHs concentration in flue gas was decreased by 44.94% at 1150°C. The maximum removal of the total PAHs TEQ concentration was as high as 45.24% at 1250°C.

Highlights

Coal has been and will continue to be a main primary energy source, especially with the increase of population and the rapid economic development in China
With adding 0.5% waste iron residue (WIR), the coal combustion efficiency was enhanced by 6.15%, and the total Polycyclic Aromatic Hydrocarbons (PAHs) concentration in flue gas was decreased by 44.94% at 1150°C
The contents of five rings and six rings PAHs increased with temperature at 950–1250°C, while the two-rings, three rings and the total PAHs emission in flue gas were increased with temperature at 950–1150°C, Components toxic equivalent factor (TEF)

Summary

Introduction

Coal has been and will continue to be a main primary energy source, especially with the increase of population and the rapid economic development in China. In order to improve coal combustion efficiency, especially the high rank coal with low reactivity, many methods were applied during coal conversion process, including advanced reactor (Loscertales et al, 2015), oxygen enriched technology (Toftegaard et al, 2010) and catalytic combustion (Ouyang et al, 2014). Catalytic coal combustion is one of the most promising approaches of improving energy utilization efficiency, which has been mainly applied in power plant boiler (Li et al, 2007), entrained-flow reactor (Molina et al, 2005) and blast furnace (Zou et al, 2014). Catalysts used for coal combustion are mainly alkali and alkaline earth metals (AAEM) and some transition metal compounds

Methods

Results

Conclusion