| 摘要 |
PURPOSE:To enable to maintain the optimum air-fuel ratio without using expensive apparatuses by a method wherein fuel flow and oxygen-containing gas flow are respectively branched at the same ratio with respect to their quantities supplied to a combustion furnace and burnt at a measuring burner in order to measure residual oxygen content. CONSTITUTION:Fuel flow and oxygen-containing gas flow are respectively branched at the same ratio with respect to their quantities supplied to a combustion furnace by means of branch lines 22 and 32 so as to be supplied to a measuring burner 4 to be burnt there. The residual oxygen content in the combustion gas is measured with an oxygen analyser 41 so as to input the resultant data into a computer 5 in order to generate control information in proportion to the difference between the set fixed value and said input data. The control information is supplied to an oxygen-containing gas flow control valve 31 in order to control the oxygen-containing gas flow. Due to the method as mentioned above, the air-fuel ratio can be controlled so as to maintain the optimum burning state without using expensive apparatuses. |
