METHOD OF IMPROVING THE HEAT ECONOMY IN A PROCESS OF MAKING GROUNDWOOD

摘要

Abstract of the DisclosureA method of improving the heat economy in a process of makinggroundwood pulp by grinding wood with a rotating grinding member(2) in a pressurized grinding space (3) and by spraying warm showerwater (G) into the grinding space. The groundwood pulp (C) obtainedis thickened by removing water (F) from the pulp and the waterremoved is again used as shower water (G) for the grinding space.Simultaneously with the thickening step the groundwood pulp iscooled by spraying thereon cooling water (E) having a lower tempe-rature than the pulp. At least a part (El) of said cooling wateris recovered and added to said water (F) removed from the pulp asreplacement water for shower water lost in the grinding process.Thus, the heat energy generated into the groundwood pulp due tothe grinding process is utilized for heating the replacementwater, thereby avoiding the necessity of using external energy forsaid heating.