The effects of different calcium compounds on gasification efficiency and heavy metals distribution during agglomeration/defluidization process

• Main Authors: Tzu Pin Hsu, 許子彬
• Other Authors: Chiou-liang Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/11081367354880640621

碩士 === 國立高雄大學 === 土木與環境工程學系碩士班 === 102 === This study studies the effects of adding Na and different calcium compounds on agglomeration/defluidization, gasification efficiency and heavy metal distribution during fluidized gasification. The result indicates that when artificial waste contains Cd, Pb and Cr, the generation of H2 will be increased during gasification process and the yield of H2 generates from 8.42 mol% to 9.59 mol% at 800 ℃. Moreover, an agglomeration of bed material will be formed and also increase the yield of H2 when adding Na into the artificial waste. The yield of H2 generates from 9.59 mol% to 9.91 mol% at 800 ℃. Additionally, the Ca(NO3)2 has the best efficiency to inhibit the agglomeration/defluidization. Adding Ca compounds also increases H2 generation. The yield of H2 generates from 9.59 mol% to 14.29 mol% at 800 ℃. (Ca(NO3)2: 11.99 mol%, CaO：12.44 mol%, CaCO3：14.29 mol%) For the distribution of heavy metal substances, heavy metal distributes in coarse particle (>1.00 mm) and small particle (<0.39 mm) after agglomeration/defluidization. The best conditions of interception percentage of the heavy metal substances is adding Ca(NO3)2 at 700 ℃. On the distributions of heavy metal substances, there will be mostly the agglomerations of the melt flow whose particle size is larger than 1.00mm and smaller than 0.390mm at the bottom. And we found that the best retention percentage of the heavy substances to add Ca(NO3)2 when the temperature at 700 ℃ are Cd：6.15%, Pb：39.86%, Cr：52.47%.