The Kuznetsk Lean Coal Combustion Scheme Optimization Using Straight-Flow Burners and Nozzles with Solid Slag Removal

The article presents the results of research and optimization of the furnace volume aerodynamics for furnaces equipped with straight-flow burners with solid slag removal in combusting Kuznetsk lean coal. The research was carried out using the ANSYS Fluent computational fluid dynamics (CFD) system. Recommendations for the development of the solid fuel combustion schemes using straight-flow burners and nozzles are given along with a methodology for conducting research and optimization of the furnace volume aerodynamics. Optimization criteria are formulated, and input data for carrying out the study are selected. A general schematic layout of straight-flow burners and nozzles (in relative dimensions) has been developed. The overall layout is divided into three zones over height with subsequent stage-by-stage optimization of the placement of burners and nozzles in each zone. The optimal number of vertical planes for placing the burners and nozzles has been chosen. The previously developed mathematical model of slag deposition on furnace waterwalls was applied to estimate the waterwall slagging probability. Based on the results from the accomplished optimization of the solid fuel combustion scheme, high performance indicators of the combustion chamber have been obtained.