Some years ago, the Shoalhaven paper mill installed a very small recovery furnace – of the type known as a smelter. Shoalhaven in those days produced 40 t/day of cotton linters pulp using caustic soda in a Pandia digester. The problem with the furnace was that it was virtually impossible to control wild fluctuations in both the black liquor feed rate and in the furnace pressure. Covey Consulting was engaged to resolve the problem. Step1 was to lo

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