Destruction of Halogenated Organics in Flue Gas Using Direct Current Plasma Torch

• Main Authors: Wei-Fang Shiau, 蕭威方
• Other Authors: Kuo-Ching Chang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/05415102484014942576

碩士 === 國立屏東科技大學 === 環境工程與科學系 === 90 === A duct system was designed to simulate the flue gas emission in industrial process. A direct current ( D.C.) plasma torch was installed on the turning point of flue gas duct to substitute the traditional air pollution control devices. The D.C. plasma torch has the characteristics of high temperature, high reactivity, and abundance of free radicals and ultraviolet ray. The pollutants in flue gas can be easily destructed and recombined to form simple molecules when exposed in D.C. plasma torch. To demonstrate the capability and applicability of this system, the highly stable Dichlorodifluoromethane (CCl2F2) was used as surrogate to represent the halogenate organics pollutant in flues gas. The effects of input electrical currently (power) of plasma, plasma carrier gas flow rate, pollutant concentration, and flue gas flow rate on Destruction and Removal efficiency（DRE） were pursuit in this study. The results of this experiment show that the range of Destruction and Removal efficiency is wide from 10% to 90%. The DRE has a positive correlation with the current of the plasma. It also has the positive correlation with the gas flow rate of the plasma and the pollutant flow rate as well. However, as the pollutant flow rate increased DRE will be decreased. The gas flow rate of the plasma has obvious effect upon DRE. The reason for that is the increasing of the gas flow rate of the plasma will increase the number of the highly energy particles so as to increase the collision possibility with the pollutants. In addition the design of the plasma gas flow equipment with the output power to be matched with the speed of flue gas is the only reason for causing the less effect to DRE by input current of the plasma than that of the gas flow rate of the plasma and which will cause DRE to be decreased as the increasing of the flue gas disposal quantity. Therefore, a matchable design of the plasma equipment in the experiment is a key to success. This experiment proves that should the operation parameters be adjusted properly the direct current plasma will have better disposal effect to flue gas. This technology has the advantages such as simple equipment, easy maintenance, without regeneration treatment or adding any chemical things etc. In the field of the equipment research for air pollution protection it is full of potentiality.