Brownstock Washing Cost Optimization, 19PEERS



The objective of brownstock washing is primarily to recover spent pulping chemicals as efficiently as possible.  The recovery of pulping chemicals is necessary for the economics of the Kraft pulping process.  For bleached mills, a secondary objective is to minimize black liquor solids carryover to the bleach plant to reduce excessive bleaching chemical usage. Aside from specific washer technology and process configuration, the dilution factor is the primary process variable that impacts washing performance.  Higher dilution factor results in lower soda loss, but more evaporation load and higher utility steam cost and pumping electrical power cost.  The utilities costs depend on the evaporators process configuration, number of effects and the overall evaporator economy.  The intent of this paper is to review the cost parameters in brownstock washing optimization for both unbleached and bleached production, explore the sensitivities of the cost parameters and equipment performance, and present a basic method for brownstock washing cost optimization. 

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