Abstract
The environmental pollution and high energy consumption caused by the coal-dominated energy structure in China have been the focus of attention for a long time. The co-firing of biomass with coal can save coal resources and realize effective utilization of biomass. In this paper, brewery wastewater sludge (SD) and bituminous coal (BC) were blended for an experimental study which aimed to provide basic experimental data and operational guidance as a reference for practical application in power plants. The co-firing characteristics of sludge and bituminous coal were studied. The results show that the burnout temperature and ignition temperature decrease with an increase in the sludge blending ratio. The Comprehensive Combustion Index (CCI) first rises, then decreases, reaching a maximum at about 15%. Compared with the atmosphere with 79% N2/21% O2, under the 79% CO2/21% O2 atmosphere, ignition is delayed and the burnout temperature is higher. Under an O2/CO2 atmosphere, as the O2 concentration improves, the thermo-gravimetric (TG) curve shifts to the low-temperature region, the burnout temperature drops significantly, and the comprehensive combustion characteristics are improved. With an increment of the heating rate, the curve of TG analysis shifts to the high-temperature region and the CCI increases. This study could provide helpful information on practical blending in coal-fired power plants for energy savings and emission reductions.
Highlights
Over the past few years, with the development of the global economy, energy shortages and environmental pollution have become two important issues facing humankind
Magdziarz et al [6] used TG, derivative thermo-gravimetry (DTG) and differential thermal analysis (DTA) to study the combustion of sludge, coal, and two types of biomass, as well as biomass and sludge mixed with coal as their co-firing conditions
The results show that the combustion characteristics of the mixed biomass are improved
Summary
Over the past few years, with the development of the global economy, energy shortages and environmental pollution have become two important issues facing humankind. Magdziarz et al [6] used TG, DTG and DTA to study the combustion of sludge, coal, and two types of biomass, as well as biomass and sludge mixed with coal as their co-firing conditions. Their results showed that the influence of heating rate on the TG curve varies and coal co-combustion with biomass and sludge can obtain economic benefits. Through analyzing the combustion characteristics of bituminous coal and blended sludge samples, the feasibility of blending sludge in the boiler is determined This provides the experimental data and a practical reference for the later mixing of sludge in power station boilers and a technical discussion for future O2 /CO2 combustion. Due to the improvement in the comprehensive combustion characteristics, coal-fired power stations would have higher combustion efficiency and stability
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