Air Products and Chemicals, Inc.

Walter T Mullen

Vincent L Magnotta

An improved method of chemical recovery from kraft black liquor is disclosed in which the heat generated by controlled oxidation of the liquor is utilized to reduce the viscosity and net heating value of the liquor which allows the firing of a more concentrated liquor in the recovery boiler. Net steam recovery is increased for a given black liquor feed rate. Alternatively, the firing of liquor having a higher solids concentration is possible, which increases the throughput of the recovery boiler.

Method for controlling the viscosity of Kraft black liquor

A process for combusting low B.T.U. high moisture content fuels by enriching the normal process air used in the combustion process.

Combustion of low BTU/high moisture content fuels

Combustion of low B.T.U./high moisture content fuels

A process for combusting black liquor by enriching the normal process air used in the combustion process by the addition of up to 5% oxygen.

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Burlington, Canada

Walter T Mullen