Emission Study of RDF and Coal Co-combustion in a Pilot Scale Vortexing Fluidized Bed Combustor

• Main Authors: Tzu-Chung Yang, 楊子忠
• Other Authors: Chien-Song Chyang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/d7gaqn

碩士 === 中原大學 === 化學工程研究所 === 92 === Abstract In Taiwan, the renewable <a href="http://www.ntsearch.com/search.php?q=energy&v=56">energy</a> is getting more and more interest to practice the diverse <a href="http://www.ntsearch.com/search.php?q=energy&v=56">energy</a> policy. Therefore, one important waste- to-energy technology, co-combustion of refuse derived fuel (RDF) and coal, was investigated in this present work. The objective of this study is to discuss the feasibility of RDF co-combustion with coal from the viewpoint of pollutant emissions. The operating parameter effects on RDF combustion were investigated in a pilot scale vortexing fluidized bed combustor (VFBC). The concentration of gaseous pollutants, HCl, Cl2, CO, NO, N2O, SO2 and Dioxin were detected. Furthermore, an experimental method, response surface methodology (RSM), was used to understand the effect intensities of various operating variables and their interaction on the pollution emissions. The experiments were carried in a pilot scale VFBC, a 0.4m×0.8m rectangular combustion chamber constructed of freeboard with 0.75m inside diameter and 4.6m in height. The co-combustion ratio, excess-air ratio, and Ca-sorbent adding ratio were investigated. The results of this study indicated that (1) to add Ca(OH)2 into RDF as manufacturing can reduce the HCl and Cl2 concentration in flue gas; (2) the NOx concentration increases with the excess-air ratio; (3) N2O formation is sensitive to the operating temperature. In this study, the feasibility of RDF co-combustion with coal is demonstrated. The CO、N2O、NOx、SOx concentration are much lower than the environmental regulations. The problem we mostly regarded (HCl emission) is improved effectiively by adding more Ca(OH)2. To minimize the pollutant emissions, the operating conditions with 850℃bed temperature, 70％ excess-air ratio and 5.2 Ca/Cl equivalent ratio are recommended.