Usable excess heat in future kraft pulp mills

Artikel i vetenskaplig tidskrift, 2002

The process modifications that integrated different processes in the kraft pulp mills and thus decreasing the head demand are discussed. Mills harness excess heat at medium temperature (70°-100°) to replace live steam and to decrease heat demand. Two model mills which are used to determine how using excess heat affects the heat balance are also discussed. The grant composite curves (GCC), which are used to represent process integration in the pulp and paper industry, show the lowest energy demand using economically viable temperature differences between heat-exchanged streams. The live steam demand is reduced by designing the heat system differently and using the excess heat in the evaporation plant.