| 摘要 |
A method of improving the heat economy in a process of making groundwood pulp by grinding wood with a rotating grinding member (2) in a pressurized grinding space (3) and by spraying warm shower water (G) into the grinding space. The groundwood pulp (C) obtained is thickened by removing water (F) from the pulp and the water removed is again used as shower water (G) for the grinding space. Simultaneously with the thickening step the groundwood pulp is cooled by spraying thereon cooling water (E) having a lower temperature than the pulp. At least a part (El) of said cooling water is recovered and added to said water (F) removed from the pulp as replacement water for shower water lost in the grinding process. Thus, the heat energy generated into the groundwood pulp due to the grinding process is utilized for heating the replacement water, thereby avoiding the necessity of using external energy for said heating. |
