Importance

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Abstract

An oil-burning or gas-burning warm up burner for the hearth of a circulating fluidized bed boiler. The burner has a fuel lance on the axis of the burner, a rectangular peripheral admission channel admits combustion air around the lance. Air flow channelling sheets are on either side of the lance. The fuel lance is retracted during periods of normal operation of the circulating fluidized bed boiler when the warm up burner is not in operation. The lance is isolated in retracted position from the atmosphere of the hearth. The lance is isolated by longitudinal segments of the combustion air flow channelling sheets constituting flaps provided with an axle perpendicular to the axis of the burner. Rotation of the axles enable the segments to take up positions perpendicular to the burner axis closing the corresponding passage of the combustion air admission channel beyond the end of the lance, when the lance is in its retracted position.

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First Claim