| 摘要 |
<p>PURPOSE:To eliminate a disadvantage that the combustibility is aggravated and the decrease in NOx is inhibited when the exhaust length is changed in an exhaust gas recirculation type combustion apparatus, thereby the optimum combustibifity being achieved. CONSTITUTION:A servo valve 9 is installed in an exhaust gas recirculation device 7 for recirculating exhaust gas to a combustion air supply passage 10 which connects the downstream side of combustion chamber 6 to the upstream and is provided with an O2 sensor 11, so that the amount of recirculated exhaust gas is controlled in such a manner that the O2 concentration is always kept constant. Even if the exhaust length is changed, the optimum combustibility can be always achieved without being affected by the chance, by which the effect of decreasing NOx can be well maintained.</p> |
