Abstract
This paper presents an experimental study of the ignition and combustion of coal–water slurry fuel (CWSF) droplets in a high-temperature oxidizing environment at \(700{-} 900\) °C. The effect of adding waste motor oil as a component of CWSF and as a feedstock for generating syngas to be fed into the CWSF combustion zone is investigated. The feasibility of co-combustion of CWSF with syngas has been experimentally confirmed. The gas-phase ignition delay of CWSF droplets with the addition of syngas to the combustion zone is \(1.1{-} 1.2\) times shorter compared to CWSF combustion without adding syngas. Under these conditions, the heterogeneous ignition delay is reduced by a factor of \(1.3{-} 1.7\) and the combustion duration is shortened by a factor of \(1.2{-} 1.5\) . The use of waste oil as a component of CWSF provides a significant improvement in energy performance, which, combined with the increased combustion temperatures, makes this strategy the most attractive for practical implementation.