This paper focuses on the experimental study and comparative analysis of characteristics, boundary conditions and ignition behavior of slurry fuels prepared from peat, coal processing waste (slime and filter cake), and lignite. Waste turbine oil (with a fraction of 10%) was an additional combustible component. The use of waste oils in waste-derived blends can provide a significant increase in the integral characteristics of fuel ignition as well as increase its calorific value. We measured the ignition delay times, duration of burning, ignition temperatures, peak combustion temperatures, and emissions of sulfur and nitrogen oxides. These characteristics are fundamental for designing the production areas involving fuel supply, atomization, and combustion, as well as flue gas treatment. The experiments were conducted using a lab-scale furnace and small fuel portions. The relative efficiency ratios (considering energy, environmental, and cost criteria) of waste-derived blends were evaluated relative to conventional fuels, such as coal and fuel oil. We established that the most promising fuel slurries have a heterogeneous composition and consist of milled coal, slime, and peat. The averaged efficiency indicator of the studied mixtures varies in the range of 1.6-9.5 (versus coal) and 3.9-30.2 (versus fuel oil). In accordance with experimental data and calculations, the fuel consisting of 30% filter cake, 20% coal slime, and 50% water has the greatest potential in terms of a combination of energy, environmental, and cost criteria. The data obtained can be used to develop waste-to-energy technologies as well as to rationalize the involvement of low-rank fuels and wastes into the energy sector.GRAPHICS
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