Enhancement of Ignition and Combustion of Coal–Water Slurry Fuels

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.