| 摘要 |
A combustion apparatus ( 10 ) incorporating a dry low NOx (DLN) combustor ( 20 ) that uses two different fuels ( 30, 40 ) simultaneously. One fuel ( 30 ) is premixed with air ( 22 ) for a primary combustion zone ( 25 ), and a second fuel ( 40 ) supplies a diffusion pilot flame ( 29 ). Each fuel may be selected for its specialized role, maximizing overall combustion efficiency while lowering emissions. A primary fuel ( 30 ) such as natural gas (NG) may be chosen for its economy and combustion characteristics in a lean premix. A pilot fuel ( 40 ) may be chosen for having a low diffusion flame temperature and a clean burn. An oxygenated pilot fuel such as dimethyl ether (DME) has a lower flame temperature than natural gas, thereby reducing NOx from the pilot flame. The pilot fuel ( 40 ) may be produced from the primary fuel ( 30 ) by a reformer ( 50 ) associated with the combustion apparatus.
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