JUSTIFICATION OF RESOURCE EFFICIENCY OF THE TECHNOLOGIES FOR BURNING WATER-COAL FUELS WITH BIOMASS ADDITIVES
One of the most pressing problems of our time is environmental safety. The pollution of the Earth’s atmosphere in recent decades is caused by work at thermal power plants burning coal in the territories of the most popular states (USA, China, India, etc.). The use of a new class of fuel - bio-water-coal - can significantly reduce emissions of man-made gases, generated during combustion of coal in the furnaces of steam and hot water boilers, into the Earth’s atmosphere, expand the raw materials base of the modern thermal power plants and increase the resource efficiency of coal-fired power systems. The aim of the research is to study the influence of the concentration composition on the integral characteristics of ignition of the drops of the biohydrocarbon fuels under high-temperature heating. Object: a water-coal suspension based on brand T coal, water and spruce needles. In the course of the experimental studies, the following mass concentrations of coal and biomass were considered 50/0 %, 45/5 %, 40/10 %, 35/15 %, respectively (50 % - water). Method: experimental determination using the high-speed Photron FASTCAM CA4 video camera of the temporal characteristics of ignition of drops of the bio-water-coal suspensions under conditions corresponding to the heating intensity of the combustion chambers of the steam and hot water boilers; registration of medium temperature using chromel-alumel thermocouples. Results. The effect of mass concentration of forest combustible material on ignition delay times (tgn) of water-coal fuels has been established. It was shown that when the fuel composition contains 15 % of biomass, the ignition delay times are reduced by more than three times compared with water-coal fuel without adding biomass at relatively low temperatures of the combustion medium. The results of experimental studies are also the basis for development of combustion models of liquid composite fuels.