COMBUSTION CONTROL DEVICE FOR GAS BURNER

摘要

PROBLEM TO BE SOLVED: To provide a combustion control device for a gas burner that can keep a less generated amount of noxious gas in a low flow rate region of fuel gas and combustion air in the gas burner.SOLUTION: The combustion control device 5 for the gas burner 1 includes a fuel control section 51, an air control section 52, a threshold detecting section 53, and a measured flow rate correcting section 54. The fuel control section 51 determines the opening of a gas flow rate control valve 31 to achieve a target combustion amount Qgr demanded of the gas burner 1. The air control section 52 determines the opening of an air flow rate control valve 32 so that a measured air ratio αm based on a measured flow rate Qgm of a gas flowmeter 41 and the measured flow rate Qam of an air flowmeter 42 is a predetermined target air ratio αr. The measured flow rate correcting section 54 makes a measured gas flow rate correction Hg for correcting the measured flow rate Qgm indicated by the gas flowmeter 41 to a larger value by a predetermined amount, and a measured air flow rate correction Ha for correcting the measured flow rate Qam indicated by the air flowmeter 42 to a smaller value by a predetermined amount when a low flow rate state X is detected by the threshold detecting section 53.