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Abstract

A Pulp Mill Recovery installation for producing liquors containing different concentrations of recovered process chemicals or combustion gasses containing different concentrations of process chemicals from a spent liquor obtained from the production of pulp. The installation includes a first gasifier for gasifying a portion of the spent liquor in a first reactor under a first set of reaction conditions to produce a first smelt and a first combustion gas having a first concentration of process chemicals; a first quench vessel for dissolving the first smelt in a first aqueous liquid to produce a first liquor having a first concentration of process chemicals; a second gasifier for gasifying a portion of the spent liquor in a second reactor under a second set of reaction conditions to produce a second smelt and a second combustion gas having a second concentration of process chemicals; a second quench vessel for dissolving the second smelt in a second aqueous liquid to produce a second liquor having a second concentration of process chemicals. The first set of reaction conditions is selected to be different from the second set of reaction conditions such that at least one of the first concentration of process chemicals in the first combustion gas or the first liquor is different from the second concentration of process chemicals in the second combustion gas or the second liquor.

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First Claim