【作者】 邢金丽；

【导师】 袁旭东；

【作者基本信息】 华中科技大学 ， 供热、供燃气、通风及空调工程， 2005， 硕士

【摘要】 随着科学技术的飞速发展,化学品生产规模和品种的扩大极为迅速,在人类生活中占据了重要的地位。少数化学品给生态环境和人体健康带来严重危害,特别是挥发性有机化合物(Volatile Organic Compounds)所引起的污染。对于挥发性化合物现有的控制技术尚不完善。脉冲放电等离子体法被认为是一种很有前途的治理有害废气的新技术。在本文中主要讨论了脉冲电晕放电低温等离子体处理挥发性有机化合物VOCs的应用研究。在本文中首先对室内挥发性有机化合物VOCs进行了简单介绍,从它的概念、存在状态、种类、对人体的危害、控制方法等方面做了介绍,对现有的几种处理VOCs的方式做了介绍,并提出了低温等离子处理VOCs是一种新型的、非常有前途的技术。其次分析了低温等离子体的基本理论,它的产生方式,各种方式产生低温等离子体的优缺点及应用,并着重对电晕放电低温等离子体的基本理论进行了分析为后面利用脉冲电晕等离子体处理挥发性有机化合物VOCs提供理论基础。根据电晕放电等离子体的基本理论,得出了等离子体处理VOCs的机制:在放电产生的活性粒子(如高能电子、臭氧、自由基等)的作用下,发生一系列的物理化学反应,使有害的VOCs转化成无害的物质。其可能的途经是:首先,高能电子经过与目标分子发生非弹性碰撞,将能量全部或部分传递给分子,使其裂解,激化等; 接着,上述被高能电子裂解、激化的分子在臭氧和氧等离子的作用下,被氧化成CO2、CO和H2O。随后分析了影响VOCs去除率的各种因素,为脉冲电晕等离子体发生器的设计提供了重要的参考依据,并对反应器的各项参数进行了设计计算。最后,对反应器的可行性进行了经济性分析,得出了将脉冲电晕等离子发生器用于空调系统中所耗资。更多还原

【Abstract】 Now, with development of technology, the throughput and breed of chemical enlarge rapidly .it holds important station in people’s living. Fewness chemicals bring serious harm to environment and people’s health, especially pollutions are induced by VOCs. The current technologies for controlling VOCs have associated with some problems. Pulse corona induced plasma discharge process (PCPP) is regarded as a promising technology to control these Pollutants. In this dissertation, the applied research in decomposition VOCs by pulse corona discharge plasma is discussed primarily. In this paper, firstly, introduce simply VOCs in its conception, existent estate, kind harm and control indoor, describe several modes decomposing VOCs now. Subsequently bring forward that non-thermal plasma decompose VOCs is a late-model promising technology. Secondly, it analyse basic theory of non-thermal plasma in its form and non-thermal plasma merit and demerit as well as its application is come into being by different modes. In this chapter it analyse importantly basic theory of theory of non-thermal plasma, it provides academic base for decomposition VOCs by pulse corona discharge plasma. On elementary theory of non-thermal plasma, the mechanism of VOCs destruction was decided: under the action of activated particles (such as high-energy electrons, ozone, radicals, etc) produced by discharge reaction, a series of physical and chemical reaction will take place, the result is that harmful VOCs is decomposed into unharmful substance. The removal pathways are: fist, high-energy electrons undergo an inelastic collision with target molecule, and transfers all or part of its kinetic energy to molecule. Inelastic collisions result in a charge to the target molecule such as ionization, dissociation or excitation. Secondly, cracked molecules are oxidated into CO2、CO and H2O by ozone and oxygen plasma. Finally, it analyse factors of affecting decomposition efficiency, it provide academic basic and referenced basis for plasma actor designing. Then analyse feasibility of plasma reactor on economy and estimate requisite bankroll if we are going to apply it to condition system.更多还原