【作者】 成连杰；

【导师】 沈继忱；

【作者基本信息】 东北电力大学 ， 控制理论与控制工程， 2009， 硕士

【摘要】 火电站锅炉启动和低负荷稳燃过程中,需要消耗大量的燃料油,我国的油资源贫乏,并且国际原油价格昂贵,因此节油急不可待。等离子点火装置可以在不需要任何燃油的情况下点燃煤粉,达到点火及稳燃的目的,是一种有效节约锅炉点火、稳燃和调试用油的方法,对降低发电成本、节约油资源、增强国家能源安全有很大意义。等离子发生器是等离子点火系统主要设备之一,其结构特点、点火特性直接关系到该技术的应用和推广,因此,本文对等离子发生器的结构和点火特性进行了系统的研究。本文介绍了等离子体的基本特性、等离子体点火系统的基本构成,对等离子发生器的阴极、阳极和通道以及冷却方式和燃烧器进行了设计分析。从热力学和物理化学的角度对等离子发生器出口的等离子体射流温度进行了数值模拟,给出了不同功率和流量之间的关系。然后对在磁场作用下等离子的运动进行了分析和特性研究。在此基础上设计制作等离子发生器和燃烧器进行了相关的实验研究。更多还原

【Abstract】 It needs to consume a lot of oil during the course of startup and low-load combustion stabilization of pulverized coal boiler commissioning. Oil is very rare in our country, and oil price is very high in international market, therefore, saving oil is imperative. Plasma ignition system can ignite pulverized coal and stabilize flame without any oil, which is an important means to save oil used for the boiler ignition, flame stabilization and commissioning. It can be used to effectively reduce the cost of power generation, save oil resource and ensure the energy security for China. Plasma generator is one of the main devices of the plasma ignition system, whose structure and ignition characteristics play the key role in the application and popularization of plasma ignition technology. Therefore this paper studies the ignition characteristics of plasma generator systematically.This thesis introduces the basic characteristics of plasma and fundamental configurations of plasma ignition system. Then it analyzes the design approach about components of the plasma generator and the plasma ignition burner, including the generator’s cathode, anode and the channel as well as the cooling mode. On this condition, applying knowledge of physical chemistry and thermodynamics, this thesis simulates theoretically plasma temperature of plasma generator outlet. We have known the relationship between the different power and the air flow. Later on research is made on the analyses of the plasma movement under the magnetic fields. Finally an experimental study is made to design and processes the plasma generator and the plasma ignition combustor.更多还原