Combustion of composite fuel from coal and sawdust

Relevance. In the last decade, the problem of the necessity of utilizing large volumes of both non-design coal and coal waste, as well as waste of the wood processing industry at existing thermal power plants has become increasingly urgent. The solution of this problem expanded the research area of dispersed combustible materials combustion issues, making the study of joint combustion of low-metamorphosed power coals, coal waste and wood processing waste, as requirements for rational utilization of industrial waste. Aim. To study the composite fuel combustion from coal and sawdust based on the experimental technique and methodology for analyzing video files of air suspension ignition in the form of graphical visualization of combustion. Methods. Based on the methodology for studying the combustion of air suspension and the methodology for analyzing video files of air suspension ignition in the form of graphical visualization of combustion, the combustion of composite fuel from coal and sawdust is studied. Results and conclusions. The authors have studied the combustion of composite fuel air suspension from long-flame coal of Kuznetsk deposit and wood (pine) sawdust during their separate grinding and joint combustion. They obtained the graphic visualization of intensity of explosive combustion of coal air suspension and sawdust in reaction volume from time of process flow. It was found that the studied fuel composition can have sufficient and even slightly excessive quantity of volatile components, which makes fuel-oxidizer system react during combustion by forming the second combustion peak. It was found that the most effective use in fuel composite is the following ratio of components: coal – 70%, sawdust – 30%. Effective coefficient of excess fuel is defined as α=1.