LOW NOX COMBUSTION APPARATUS

摘要

PURPOSE:To achieve both low NOx generating and complete combustion simultaneously by a method wherein the combustion of unburnt part is carried out after the completion of denitration reaction by securing sufficient time until flames come in contact with the tertiary air. CONSTITUTION:The secondary and tertiary air are transferred respectively to an air preheater by a forced air blower and the part of the air flows into a secondary air passage through an inlet hole 11 for the secondary air of which opening is controlled by a slidable damper 9 and after revolving force is provided by a secondary vane 12, the air is spouted into the furnace inside from a secondary jet hole 13. The remaining air is provided with revolving force by a tertiary air resister 15 and spouted into the furnace inside from a tertiary jet hole 16. In this case, a spacer ring 17 with sufficient thickness (d) is installed and its end part is so constituted as to be expanded outside the axial center of the spacer ring. The tertiary air is spouted around the circumference of flames with a fixed space to the flames. The sufficient time to denitrate in the flames is secured and the flames finishing denitration comes in contact with the tertiary air at the downstream part of the flames to carry out complete combustion.