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Combustion apparatus using pilot fuel selected for reduced emissions

Bruce Rising
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TLDR
In this paper, a combustion apparatus incorporating a dry low NOx (DLN) combustor that uses two different fuels (30, 40 ) simultaneously is described. But the authors do not specify the specific role of each fuel.
Abstract: 
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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Patent

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References
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Patent

Method and plant for increasing oil recovery by gas injection

Ola Olsvik, +5 more
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Process for recovering natural gas in the form of a normally liquid carbon containing compound

Christiaan P. Van Dijk, +1 more
TL;DR: In this paper, a method for converting natural gas to a normally liquid carbon containing compound, such as methanol and/or dimethyl ether, and to gasoline grade liquid hydrocarbons and olefins was proposed.
Proceedings ArticleDOI

Dry Low NOx Combustion Systems for GE Heavy-Duty Gas Turbines

L. Berkley Davis
TL;DR: The first dry low NOx (DLN) system was developed by General Electric in the mid-1970s and operated by the company in 1981 as mentioned in this paper, and further development was done prior to commercial introduction.