课程名称︰质能平衡 课程性质︰必 课程教师︰蔡伟博 开课学院：工 开课系所︰化工 考试日期（年月日）︰100/6/21 考试时限（分钟）：120 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : 5. The following igure shows a process in which CO is burned with 70% of the theoretical air in Reactor 1. The combustion gases are used to generate stream, and also to transfer heat to the reactants in Reactor 2. A portion of the combustion gases that are used to heat the set of tubes in Reactor 2 are recycled. SO2 is oxidized in Reactor 2. You are asked to calculate the lb mol of CO burned per hour in Reactor 1. Figure: 等下传 6. A dryer produces 200kg/hr of a product containing 10% water from a feed stream that cintains 1.25g of water per gram of dry material. The air enters the dryer at 100 degree C dry-bulb and a wet bulb temperature of 38 degree C ;the exit air leaves at 55 degree C dry-bulb and 70% RH, as shown in figure. Calculate the air and heat supplied to the heater, neglecting any heat lost by radiation, used in heating the conveyoranf so forth. The specific heat of the product is 0.18. dew point | air @ 20 degree C, 52% RH @38 C | ˇ |=========| |-- | Reactor |<----- | |=========| | ˇ ^ | |=========| | |---| dryer |-----------> exit air: 55 degreeC 70% RH --->|=========|-------------> product: 200kg/hr, 10% water 43 degree C feed: 21 degree C, 1.25g water/ g dry material Bonus question: 4kgs of water at 27 degree C and 200kPa are heated at constant pressure until the volume of the water becomes 1100 times the original valuve. What is the final temperature of the water? 各种表格请自备。 -- 人生到处知何似? 应似飞鸿踏雪泥。泥上偶然留指爪,鸿飞那复计东西。 老僧已死成新塔, 坏壁无由见旧题。往日崎岖君知否？路长人困蹇驴嘶。 --

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