| 摘要 |
PURPOSE:To prevent change into white smoke effectively while reducing the capacity of a dry type cooling section, and to curtail the cost of a cooling tower and the cost of ventilation power by forming the dry type cooling section to two steps and making the height of the steps differ. CONSTITUTION:Dry type cooling sections 4, 5 are installed at two steps of the inside and the outside in the upper sections of a wet type cooling section 1, and the height of the cooling section 5 on the inside is formed in height lower than the cooling section 4 on the outside. Hot water to be treated is forwarded to the dry type cooling sections 5 by a header 8 and transmitted over the dry type cooling sections 4, and fed to feed water tanks 2 for the wet type cooling sections 1. External air 13, which is introduced by a fan stack 7 and passes through the lower sections of the dry type cooling sections, passes through two steps of the cooling sections 4, 5, and air 14 passing through upper sections passes through only one step of the cooling sections 4 and indirectly heat- exchanges with hot water to be treated. External air 17 passing through the wet type cooling sections 1 directly heat-exchanges with hot water to be treated, is changed into humid air 18 and enters into a tower, but it is mixed with dry air 15 at a high temperature first and mixed with dry air 16 at a low temperature at that time, and change into white smoke of the external air is prevented effectively and the air is discharged from the fan stack 7. |
