tailieunhanh - STEAM POWER by Mike Brown_9

Tham khảo tài liệu 'steam power by mike brown_9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http MIL-HDBK-1003 7 Number of Water Passes. A single pass condenser is commonly used where the water is supplied from natural sources such as rivers or oceans. If the source of circulating water is at all limited a two pass condenser will probably be the best selection since a single pass condenser requires more cooling water per square foot of condenser surface and per kilowatt of electrical generation. Usually a two pass condenser is used with cooling towers or a cooling lake. Plant layout and orientation with respect to cooling water source may also dictate the use of a two pass condenser. If sufficient water is available the most economical condenser is a single pass. A single pass condenser is normally smaller in physical size than the equivalent two pass unit. Typical condenser sizes and cooling water flows for a given turbine generator capacity are given in Table 15. Table 15 Typical Condenser Size and Cooling Water Flow Turbine Condenser Surface Cooling Water Tube Tube Generator Kw ft 2 Gpm Length . Single Two Single Two Feet Inch Pass Pass Pass Pass 5 000 3 836 5 147 6 607 4 433 20 3 4 7 500 5 754 7 721 9 911 6 650 20 3 4 10 000 7 096 9 522 12 223 8 201 20 3 4 20 000 12 728 17 079 21 924 14 701 20 3 4 30 000 18 486 24 637 32 301 21 525 24 7 8 40 000 24 071 33 290 36 051 24 929 28 7 8 50 000 30 704 43 211 42 921 30 202 30 7 8 60 000 34 705 46 889 57 205 38 645 30 1 80 000 38 706 52 295 63 800 43 100 30 1 100 000 48 180 65 096 79 418 53 650 30 1 . 1 - Note Based on use of Admiralty tubes 85 degrees F 29. 4 degrees C cooling water inlet 2-1 2 inch Hg Abs. condensing pressure 85 percent cleanliness factor ft sec tube water velocity and 18 BWG tube wall thickness. Tube Cleanlines s Factor. Design tube cleanliness can vary from 70 to 95 percent depending on tube water velocity cooling water cleanliness and cooling water scale-formation . characteristics. As condenser tubes .

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