焙燒參數對生質碳中戴奧辛類化合物之影響

Influence of the Torrefaction`s Parameters in Dioxin-Like Compound from Biochar

范介安(Chieh-An Fan)

指導教授 ： 林傑

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2014年)

https://doi.org/10.6346/NPUST.2014.00270

摘要

生質碳為生質能的一種熱處理後可產生能量，但是在熱處理的過程中可能會釋放出類戴奧辛化合物。本研究主要是要探討不同的預處理溫度及載流氣體對於生質碳中類戴奧辛化合物的影響。以實驗室中焙燒預熱處理反應系統進行實驗，實驗參數設定為模擬生質碳之處理時溫度300、500℃及載流氣體為空氣、氮氣以模擬生質碳焙燒預熱處理有氧及缺氧情況。未經處理的生質碳先測得總PCDD/Fs濃度為18483.61 pg/g及總多氯聯苯濃度為3928.26 pg/g，顯示生質碳本身已經存在戴類奧辛化合物。而在300℃及500℃氮氣參數下生質碳經焙燒預熱處理後殘餘相所測得PCDD/Fs濃度分別為1289.04 pg/g、111.16 pg/g。氣相測得PCDD/Fs濃度為1904.26 ng/m3、4840.01 ng/m3。以300℃及500℃空氣情況下生質碳經預熱處理後殘餘相之濃度PCDD/Fs分別為377.99 pg/g、80.36 pg/g。在300℃及500℃空氣參數下氣相測得PCDD/Fs濃度為701.84 ng/m3、3131.21 ng/m3。多氯聯苯方面以300℃及500℃氮氣參數下生質碳經焙燒預熱處理後殘餘相測得濃度分別為7.74pg/g、4.49pg/g。氣相測得多氯聯苯濃度為0.123 ng/m3、262.20 ng/m3。以300℃及500℃空氣參數下生質碳經焙燒預熱處理後殘餘相之多氯聯苯濃度分別為4.45pg/g、0.5052pg/g。而在氣相測得濃度分別為114.17 ng/m3、941.78 ng/m3。結果顯示生質碳中PCDD/Fs濃在參數中較高溫及缺氧環境下生成較明顯。多氯聯苯則是以高溫及有氧環境下生成較明顯。＿

關鍵字

生質碳 ； 戴奧辛 ； 焙燒

並列摘要

Biochar can be used to generate energy , but it may release Dioxin-Like compound during the thermal treatment. This study was to investigate the influence of thermal treatment temperature and inflow gas on Dioxin-Like compound properties of biochar. Using thermal treatment in a laboratory scale packed bed reaction system of biochar and the experiment was designed by two temperature(300,500℃) and two inflow gas(nitrogen, air) to simulate the biochar was used as fuel . The concentration in residual phase were 1289.05 and 377.99 pg /g with inflow gas nitrogen and air in 300℃. 111.16 and 80.37 pg /g with inflow gas nitrogen and air in 500℃, and concentration in gas phase were 1904.26 ng/m3、4840.01 ng/m3 . with inflow gas nitrogen and air in 300℃. 701.84 ng/m3、3131.21 ng/m3 . with inflow gas nitrogen and air in 500℃ respectively. The concentration of PCBs in residual phase with inflow gas was nitrogen were 7.74 pg/g and 4.49 pg/g，and concentration in gas phase were 0.123 ng/m3 and 262.20 ng/m3 .The concentration of PCBs in residual phase with inflow gas oxygen were 4.45pg/g and 0.5025pg/g , and the concentration of gas phase were 114.17 ng/m3 and 941.78 ng/m3 . Results show the biochar with inflow gas nitrogen and 500℃ parameter were release higher PCDD/Fs concentration than air,and PCBs with inflow gas oxgey and 500℃ parameter were release higher concentration .

並列關鍵字

biochar ； dioxin ； torrefaction

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