Abstract
Mixed incineration of municipal solid waste (MSW) in existing coal gangue power plant is a potentially high-efficiency and low-cost MSW disposal way. In this paper, the co-combustion and pollutants emission characteristic of MSW and coal gangue was investigated in a circulating fluidized bed (CFB) combustor. The effect of MSW blend ratio, bed temperature and excess air ratio was detailedly studied. The results show the NOx and HCl emission increases with the increasing MSW blend ratio and the SO2 emission decreases. With the increase of bed temperature, the CO emission decreases while the NOx and SO2 emission increases. The HCl emission is nearly stable in the temperature range of 850–950 °C. The increase of excess air ratio gradually increases the NOx emission but has no significant effect on the SO2 emission. The HCl emission firstly increases and then decreases with the increase of excess air ratio. For a typical CFB operating condition with excess air ratio of 1.4, bed temperature of 900 °C and MSW blend ratio of 10%, the original CO, NOx, SO2 and HCl emissions are 52, 181, 3373 and 58 mg/N m3 respectively.
Highlights
From 2006 to 2016, the amount of municipal solid waste (MSW) in China increases from 148 to 204 million tons (National Bureau of Statistics of China 2017)
The results show the NOx and HCl emission increases with the increasing MSW blend ratio and the SO2 emission decreases
The results show that the MSW blend ratio can be increased to 30% without major modification of the coalfired bubbling fluidized bed (BFB) reactor and the minimum CO emission was found at the mixing proportion of 20%
Summary
From 2006 to 2016, the amount of municipal solid waste (MSW) in China increases from 148 to 204 million tons (National Bureau of Statistics of China 2017). MSW disposal has become one of the most serious issues in China. Due to the advantages of volume reduction, energy recycling and hygienic control, MSW incineration has faster development than other disposal methods (Cheng and Hu 2010). The construction of MSW incineration power plant is facing great resistance because of its high investment cost and secondary pollutions, low efficiency and public protest. In comparison with establishing a new MSW incineration power station, co-combustion of MSW. The co-combustion of coal with biomass (Akram et al 2015; Kumar and Singh 2016; Luo and Zhou 2017) and sludge (Areeprasert et al 2016; Kumar and Singh 2017) have been widely studied and the results verify the feasibility of co-combustion. Due to the demand of MSW disposal, the co-combustion of coal and MSW has attracted more attention in recent years.
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