Process of combusting a premixed combustion fuel
AssigneeHitachi, Ltd.
InventorsJuichi Honda, Michiaki Matumoto, Sadao Mimori
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Abstract
A gaseous fuel-air premix combustion burner is disclosed wherein the production of oxides of nitrogen can be inhibited. By blowing secondary air onto at least a maximum temperature region of a secondary reaction region of a gaseous fuel-air premix combustion flame, it is possible to minimize the production of oxides of nitrogen not only in regions of the flame where the volume of primary air is smaller or larger than the theoretical volume of air but also in the vicinity of a region of the theoretical volume of air, whereby the area of a region where the production of oxides of nitrogen is reduced can be increased.
Claims12
A process of combustion having a lower NO.sub.x generation rate, comprising the steps of premixing gaseous fuel and a primary air to create a mixture within a combustibility limit with respect to the fuel, generating a flame extending in a parallelly disposed, contacting relationship with respect to a cooling wall by combustion of the mixture so as to form a maximum temperature region slightly downstream of a first reaction region in the flame, and feeding secondary air to the maximum temperature region from a side of the flame opposite to the cooling wall toward the cooling wall.
A process as set forth in claim 16, wherein said secondary air feeding step comprises providing secondary air ejections arranged in a spaced apart relation along the width of the flame.
Dependencies are inferred from the claim text.