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AssigneeHitachi, Ltd.
InventorsYoshio Sato, Nobuo Kurihara, Hiroshi Matsumoto, Tadayoshi Saito, Mitsuyo Nishikawa, Toshihiko Higashi
Estimating the term…
A method of controlling combustion in a furnace of a boiler or the like having a burner for a main combustion and a burner for a reducing combustion in order to effect combustion for furnace denitrification. The method comprises the steps of: estimating the NO.sub.x generation amount from data on a flame formed by the main combustion; estimating the reducing agent generation amount from data on a flame formed by the reducing combustion; and controlling the flow rates of fuel and air supplied for the main and reducing combustions so that the amount of NO.sub.x emission as the difference between the NO.sub.x generation amount and the reducing agent generation amount is below a specified value. In practice, each of the NO.sub.x generation amount and the reducing agent generation amount is estimated from the flame pattern, the flame volume, the distance between the outlet of the burner concerned and the root of the flame concerned, etc., thereby to distributively control the flow rates of fuel and air supplied to each of the main combustion burner and the reducing combustion burner so that the amount of NO.sub.x emission is below a specified value.
A method of controlling combustion in a furnace in which a main combustion takes place followed by a reducing combustion and which has a burner for the reducing combination disposed in the stage subsequent to a burner for the main combustion in order to effect combustion for such a furnace denitrification that nitrogen oxides (NO.sub.x) generated in the main combustion zone by said main combustion burner are reduced by a reducing agent generated in the reducing combustion zone by said reducing combustion burner, said method comprising the steps of:
Dependencies are inferred from the claim text.