大气污染控制工程--Lecture 9-2 Control of Primary Particulates.ppt

This Lecture and the Next Lecture This Lecture: Chapter 9 Page 280~314 The Next Lecture: Chapter 10 page 329~382 Exerciser Page 323, 9.45 2. Please explain the particles collection mechanisms of the surface filter, depth filter and scrubbers. 补充上届考试题 3. A typical coal has the following ultimate analysis by weight: H, 6.0%; C, 60.0%; N, 1.4%; S, 1.6%; O, 7.5%; ash 9.6%. It is burned with 20% excess air with humidity 0.0116 mol/mol dry air, and combustion is complete. The nitrogen is assumed to exit as both N2 and fuel NO2. N in the coal is assumed to be completely transformed into fuel NO2, and N2 in air is assumed to keep stable. (1) Determine the volume of combustion gas produced. (2) Determine SO2 and NO2 concentration in combustion gas produced. 大作业 选择一类典型的颗粒污染物，进行来源、颗粒物特性、控制方法以及环境影响的书面作业，可以用中文或英文形式完成。 中文字数2000字数以上； 选题如汽车尾气产生的颗粒污染物与灰霾的相关性 电厂燃煤锅炉产生的颗粒污染物及控制方法 垃圾焚烧产生的颗粒污染物、危害及控制方法 水泥行业产生的颗粒污染物、危害及控制方法 钢铁冶金行业产生的颗粒污染物、危害及控制方法 每个班2个代表进行ppt讲解，每位10分钟。 DISCUSSION Topics about Air pollution: Introducing yourself Interesting news or information about air pollution your having read or heard Your opinions on this Air Pollution course Your suggestions for Chinese Air Pollution Other familiar issues about Air Pollution Effect of superficial velocity (vs) If the superficial velocity increases, efficiency falls. Ⅲ Depth Filter Depth filter is different from surface filter, does not form a filter cake on the surface, but instead collects particles through out the entire body. Examples Filter –tipped cigarettes Family air filter (1) Depth filter model A Vy-particle Vy-gas Vrelative=Vy-gas- Vy-particle Dirty air with particles direction is from inner to outer. Fy-inertial Fy-drag Flow of gas and particles around a cylinder Db, Obstacle or Target Page 293 (1) Depth filter model Gas flow must bend to flow around the fiber. Particles tend to continue going straight because the dens