標題: An Analysis of Extinction Coefficients of Particles and Water Moisture in the Stack after Flue Gas Desulfurization at a Coal-Fired Power Plant
作者: Tu, Wen-Fu
Lin, Jenn-Der
Wu, Yee-Lin
機械工程學系
Department of Mechanical Engineering
公開日期: 1-八月-2011
摘要: Two important factors that affect in-stack opacity light extinction by emitted particles and that by water moisture after a flue gas desulfurization (FGD) unit are investigated. The mass light extinction coefficients for particles and water moisture, k(P) and k(w), respectively, were determined using the Lambert-Beer law of opacity with a nonlinear least-squares regression method. The estimated k(P) and k(w) values vary from 0.199 to 0.316 m(2)/g and 0.000345 to 0.000426 m(2)/g, respectively, and the overall mean estimated values are 0.229 and 0.000397 m(2)/g, respectively. Although k(w) is 3 orders of magnitude smaller than k(p), experimental results show that the effect on light extinction by water moisture was comparable to that by particles because of the existence of a considerable mass of water moisture after a FGD unit. The mass light extinction coefficient was also estimated using Mie theory with measured particle size distributions and a complex refractive index of 1.5-ni for fly ash particles. The k(p) obtained using Mie theory ranges from 0.282 to 0.286 m(2)/g and is slightly greater than the averaged estimated k(p) of 0.229 m(2)/g from measured opacity. The discrepancy may be partly due to a difference in the microstructure of the fly ash from the assumption of solid spheres because the fly ash may have been formed as spheres attached with smaller particles or as hollow spheres that contained solid spheres. Previously reported values of measured k(P) obtained without considering the effects of water moisture are greater than that obtained in this study, which is reasonable because it reflects the effect of extinction by water moisture in the flue gas. Additionally, the moisture absorbed by particulate matter, corresponding to the effect of water moisture on the particulates, was clarified and found to be negligible.
URI: http://dx.doi.org/10.3155/1047-3289.61.8.815
http://hdl.handle.net/11536/20960
ISSN: 1047-3289
DOI: 10.3155/1047-3289.61.8.815
期刊: JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
Volume: 61
Issue: 8
起始頁: 815
結束頁: 825
顯示於類別:期刊論文


文件中的檔案:

  1. 000293550900003.pdf

若為 zip 檔案,請下載檔案解壓縮後,用瀏覽器開啟資料夾中的 index.html 瀏覽全文。