AIR-FUEL RATIO CONTROL SYSTEM FOR COMBUSTION HEATING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide an air-fuel ratio control system for a combustion heating furnace capable of controlling combustion of a wide range from oxidized firing to reduction firing, and easily setting oxygen concentration even by a worker having a poor technical knowledge.;SOLUTION: This air-fuel ratio control system is composed of a burner 2 disposed in the combustion heating furnace, a gas supply line 3 for supplying a fuel gas to the burner 2, an air supply line 4 for supplying the combustion air to the burner 2, and a computer 10 for temperature control. The computer 10 for temperature control stores a first formula of (combustion air quantity = gas flow ratio × logical air quantity × air-fuel ratio) and a second formula of (air-fuel ratio =20.6/20.6 - oxygen concentration), and automatically controls the combustion air quantity according to the gas flow rate on the basis of the formulas when the oxygen concentration is input.;COPYRIGHT: (C)2009,JPO&INPIT