Abstract
As a kind of solid waste from coal chemical production, the disposal of coal gasification fine slag poses a certain threat to the environment and the human body. It is essential for gasification slag (GS) to realize rational utilization. GS contains fewer combustible materials, and the high heating value is only 9.31 MJ/Kg, which is difficult to burn in combustion devices solely. The co-combustion behavior of the tri-fuel blends, including bituminous coal (BC), gasification slag (GS), and bamboo residue (BR), was observed by a thermogravimetric analyzer. The TGA results showed that the combustibility increased owing to the addition of BC and BR, and the ignition and burnout temperatures were lower than those of GS alone. The combustion characteristics of the blended samples became worse with the increase in the proportion of GS. The co-combustion process was divided into two main steps with obvious interactions (synergistic and antagonistic). The synergistic effect was mainly attributed to the catalysis of the ash-forming metals reserved with the three raw fuels and the diffusion of oxygen in the rich pore channels of GS. The combustion reaction of blending samples was dominated by O1 and D3 models. The activation energy of the blending combustion decreased compared to the individual combustion of GS. The analysis of the results in this paper can provide some theoretical guidance for the resource utilization of fine slag.
Highlights
Coal gasification is a core technology for the clean and effective utilization of coal.Coal gasification fine slag, a type of solid waste, is produced in the gasification process
We proposed the blending of coal gasification fine slag with bamboo residue and bituminous coal to improve the combustion characteristics of fine slag
bamboo residue (BR) has a higher value than bituminous coal (BC) and gasification slag (GS) do in the volatile matter and volatile fuel ratio, showing that BR behaves well in combustibility
Summary
Coal gasification is a core technology for the clean and effective utilization of coal.Coal gasification fine slag, a type of solid waste, is produced in the gasification process. The disposal of gasification fine slag is mainly by stacking and landfilling [3], which causes an increase in transportation expense and soil and water pollution caused by the leachate from fine slag [4]. It is highly imperative and significant for fine slag to achieve quantity reduction, harmless treatment, and resource utilization. Dai et al investigated the co-combustion characteristics of gasification fine slag with bituminous coal, and they concluded that the co-combustion of two fuels showed a nonnegligible synergistic effect. Guo et al studied the physicochemical properties of the residue carbon from froth flotation and indicated that the comprehensive combustion performance was improved with the addition of sawdust char, and the interaction (antagonistic and synergistic) was discovered in the binary blending combustion [9]
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