| 摘要 |
<p>PURPOSE:To enable a proper flame structure to be always formed and to always decrease an amount of NOx produced irrespective of the load of a combustion load, by a method wherein a feed system of fuel to plural burners forms 2 or more systems in which a flow rate is independently controllable, and an air feed system forms 2 or more systems in which O2 concentration is independently controllable. CONSTITUTION:A gas ged line 30 to each burner throat is regulated by a valve 110, a branch directly connected to each burner is branched into 2 systems 31 and 32, and flow rate is controlled by means of valves 111 and 110. Oxygen concentration of airs 52 and 53 and movement counts of the airs 52 and 53 fed to a burner throat are regulated by air regulating dampers 211 and 212. A control system forms plural systems, and this enables increasing of a turn down ratio of each burner body, enables effective prevention of production of thermal NOx through decrease of a maximum flame temperature at the outer periphery of flame, and permits formation of an optimum flame structure irrespective of a fluctuation in a load.</p> |
