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1、Chapter 9 Boilers,燃油燃气锅炉,Para 1: steam generatorsboilers, are used to produce steam; The whole Para is about applications and function. Para 2: Heat transfer methods: A combination of radiant, conductive, and convective to change water to steam; Components: Fig.9.2-1 Factors affecting boiler operati
2、on: Density differences, pressure, temperature, water level.,9.2 Boiler Applications and Basic Operation,Components: Fig.9.3-1,9.3 Fire Tube Boilers,Mechanism: transfer heat from the fire tubes and into boiler feed water; Fire tubedenotes that the heat source is from within the tubes; Fire tube boil
3、erP170 Key terms,9.3 Fire Tube Boilers,Basic components (Para1) : Fig.9.4-1, Fig.9.6-1,9.4 Water Tube Boilers (the most common type),Principle of operation (Para2): water circulationdifferential density; Pressure (Para3): 1. Steam generation causes pressure to rise; 2. pressure is maintained adding
4、makeup water ; continuously applying heat.,9.4 Water Tube Boilers (the most common type),Main Components: 1.Furnace: components; line 2 2.Tubes: 3.Drums: 4.Gas and Oil Burners: Fuel: most boilers use natural gas or atomized fuel oil burners; some large boilers (primarily in electrical generating pla
5、nts) burn coal. Components and mechanism: Fig.9.4-2,9.4 Water Tube Boilers (the most common type),9.4 Water Tube Boilers (the most common type),5. Economizer Section (1) Function: increase boiler efficiency by preheating the water; (2) Mechanism: hot gases moving into the stack still have enough hea
6、t to offset energy costs. Boiler functions: Steam:,9.4 Water Tube Boilers (the most common type),Procedure: Typical problems: line 3, Para 3,9.5 Boiler Operation,Water hammer: Para 2, first 3 lines Solving methods: steam traps are used to remove condensate;,9.6 Steam Systems,Categories: Mechanical i
7、nverted buckets; Fig.9.6-2 for condensate, air, other non-condensable gases;Bucket trap full of condensate bucket rests on the bottom valve opens;Steam fills bucket rises valve closes,9.6 Steam Systems,Floats. Fig.9.6-3 not for non-condensable gases;,9.6 Steam Systems,Thermostatic热静力型bellows-type traps. Fig.9.6-4 cheaper; also for non-condensable gases.,9.6 Steam Systems,练习：8、15、16Thank you for listening！,
