By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Krichtafovitch, Igor A. (Kirkland, WA); Colannino, Joseph (Bellevue, WA); Wiklof, Christopher A. (Everett, WA), filed on May 31, 2013, was published online on September 27, 2016.
The assignee for this patent, patent number 9453640, is CLEARSIGN COMBUSTION CORPORATION (Seattle, WA).
Reporters obtained the following quote from the background information supplied by the inventors: "The danger of flame flashback can be present in burner systems that contain premixed fuel and air. Large volumes of premixed fuel and air can present an explosion hazard and a containment hazard.
"What is needed is a technology to reduce the incidence of flame flashback."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "According to an embodiment, a premixed fuel burner includes a body defining a fuel and air mixing volume and a passage configured to allow flow of premixed fuel and air from the mixing volume to a combustion volume as a premixed fuel jet. A charge source is configured to apply a first polarity voltage or charge to a combustion fluid corresponding to the premixed fuel jet. The charge source can be arranged in various ways. The first polarity voltage or charge can be applied to the fuel before mixing, to the air before mixing, to the fuel and air in the mixing volume, to the premixed fuel jet, or to the flame. An anti-flashback electrode is configured to carry a voltage at the first polarity and to electrically repel the first polarity charge in the combustion fluid. Flames have relatively high conductivity compared to the fuel jet. The repulsion of the first polarity charge in the flame (the flame being a portion of the combustion fluid) causes the flame to be repelled from the anti-flashback electrode. The anti-flashback electrode is arranged to repel the flame from flashing back into the mixing volume.
"In a premix burner, fuel and air are at least partially premixed in a mixing volume and the premixed fuel and air is output as a premixed fuel stream. A flame is supported with the premixed fuel stream. The presence of premixed fuel and air can create a hazard of 'flashback', where the flame can travel upstream and ignite the mixed fuel and air in the mixing volume. According to an embodiment, a method for reducing the danger of flashback includes applying a first voltage or charge at a first polarity to a combustion fluid and applying a second voltage to an anti-flashback electrode disposed adjacent to the premixed fuel stream and arranged to repel the first voltage or charge from flowing upstream toward the premixed fuel and air. The first voltage or charge can be applied to various portions of combustion fluid, which includes the fuel, the air, premixed fuel and air, the premixed fuel stream, and the flame."
For more information, see this patent: Krichtafovitch, Igor A.; Colannino, Joseph; Wiklof, Christopher A.. Burner System with Anti-Flashback Electrode. U.S. Patent Number 9453640, filed May 31, 2013, and published online on September 27, 2016. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9453640.PN.&OS=PN/9453640RS=PN/9453640
Keywords for this news article include: CLEARSIGN COMBUSTION CORPORATION.
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