ガス焚き小型ボイラーの低NO_x対策

抄録

This paper describes control measures for effective combustion process due to low NOx combustion in gas burning boiler.
Measures of process are
(1) Low NO_x burner combustion.(2) Exhaust gas recirculating combustion.
Low NO_x burner has three (3) types of burner.
(a) Ceramic burner made of ceramics.
(b) Cyrindrical type burner made of metallic perforated plate.
(c) Thin flame combustion burner utilizing gas blowing speed.
Ceramic burner has a premix chamber, and spraied gas from small holes of ceramic spraying plate to form short & dispersed flame.
Cylindrical burner has also premix chamber to make good effect, and spraied gas from small holes of end metallic plate, which enables spraied gas to form short & dispersed flame.
Thin flame (combustion) burner utilies blowing speed of gas to form hollow conical flame, in addition to involving effect of blowing gas at central part.
Exhaust gas circulating combustion enables low combustion temperature by mixing part of exhaust gas and combustion air, and is effective for low NO_x combustion.