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Mechanical Science HandbooksMechanical Science Handbooks 20000 Part 9

Tham khảo tài liệu 'mechanical science handbooksmechanical science handbooks 20000 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Miscellaneous Mechanical Components DOE-HDBK-1018 2-93 COOLING TOWERS Summary The important information in this chapter is summarized below. Cooling Towers Summary The cooling tower removes heat from water used in cooling systems within the plant. The heat is released to the air rather than to a lake or stream. This allows facilities to locate in areas with less water available because the cooled water can be recycled. It also aids environmental efforts by not contributing to thermal pollution. Induced draft cooling towers use fans to create a draft that pulls air through the cooling tower fill. Because the water to be cooled is distributed such that it cascades over the baffles the air blows through the water cooling it. Forced draft cooling towers blow air in at the bottom of the tower. The air exits at the top of the tower. Water distribution and recirculation difficulties limit their use. Natural convection cooling towers function on the basic principle that hot air rises. As the air inside the tower is heated it rises through the tower. This process draws more air in creating a natural air flow to provide cooling of the water. Rev. 0 Page 23 ME-05 DEMINERALIZERS DOE-HDBK-1018 2-93 Miscellaneous Mechanical Components DEMINERALIZERS The cost of corrosion and radioactive contamination caused by poor water quality in nuclear facilities is enormous. Demineralizers are an intricate part of water quality control. The chemical theory of demineralizers is detailed in the Chemistry Fundamentals Handbook. This chapter will address the mechanics of how demineralizers operate. EO 1.11 STATE the purpose of a demineralizer. Purpose of Demineralizers Dissolved impurities in power plant fluid systems generate corrosion problems and decrease efficiency due to fouled heat transfer surfaces. Demineralization of the water is one of the most practical and common methods available to remove these dissolved impurities. In the plant demineralizers also called ion-exchangers are used .