THICK THIN COAL DUST SEPARATION AND ARRANGEMENT STRUCTURE FOR SINGLE FIREBALL EIGHT CORNER STRAIGHT FLOW BURNER

摘要

A thick thin coal dust separation and arrangement structure for a single fireball eight corner straight flow burner comprising a boiler body (1) provided with eight sets of burners (10) thereon; each water cooled wall (9) is provided with two sets of burners (10) thereon; each set of burners (10) comprises a plurality of burners (10) with the same nozzle direction; the central lines of the nozzles on each of the eight groups of burners (10) are in the same tangential direction forming an imaginary tangential circle in the burner hearth. The eight groups of burners (10) are arranged on the four water cooled walls (9) of the boiler increasing the coal dust concentration in the thick coal dust area making the heat load of the wall surface in the lower burner area higher; thus the burning temperature in the area achieves the stable combustion required for firing anthracite; the distance of a jet flow from a nozzle outlet to a downstream adjacent corner airflow is short thus adopting a lower airflow speed of primary air coal dust; the heat flow intensity at the nozzle outlet is high thus improving the amount of heat transfer via convection and radiation and ensuring the timely firing of the anthracite coal dust flow and the stable combustion of the boiler in low load without oil.