COAL PREPARATION
Original paper
EXPERIMENTAL STUDY OF THE DEPENDENCE OF THE IGNITION INDUCTION PERIOD OF COAL-WATER FUEL ON THE OXYGEN CONCENTRATION IN THE FLOW
Abstract
The technology of drip-flare combustion of coal-water fuel (CWF) has a number of advantages: reduction of harmful emissions, the possibility of using waste, the possibility of transportation through a pipeline, explosion and fire safety. The main disadvantages include the low reactivity of the CWF during ignition. In this paper, the dependence of the ignition process of a stream of coal-water fuel droplets on the oxygen concentration in the blast is experimentally investigated. The CWF samples were prepared on the basis of Balakhta brown coal. The dependence of the ignition time of the CWF droplets on the oxygen concentration in the stream, the proportion of water, the temperature of the medium and the concentration of fuel in the volume has been established. It is shown that an increase in the oxygen concentration in the stream from 21 to 30% (vol.) leads to a decrease in the induction period of ignition of the CWF droplet stream by 54% (at a temperature of 600-700°C and a water content in the fuel of 55-75% (wt.)). A decrease in the proportion of water in the fuel from 75 to 55% (wt.) reduces the ignition induction period by 46% for the conditions under consideration.
Keywords
Ignition, nozzle, fuel spray, coal-water fuel, ignition induction period, oxygen combustion, clean technologies, emission reduction.
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Acknowledgements
The study was supported by the Russian Science Foundation grant No. 23-79-01267, https://rscf.ru/en/project/23-79-01267/.
For citation
Kuznetsov V.A. Experimental study of the dependence of the ignition induction period of coal-water fuel on the oxygen concentration in the flow. Ugol’. 2025;(2):29-33. (In Russ.). DOI: 10.18796/0041-5790-2025-2-29-33.
Paper Info
Received October 11, 2024
Reviewed January 17, 2025
Accepted January 27, 2025
