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    题名: 介電質放電技術控制小型重油鍋爐氮氧化物排放之可行性研究;NOx Removal via Dielectric Barrier Discharges for small Oil-Fired Boiler Exhaust
    作者: 吳非霖;Fei-Ling Wu
    贡献者: 環境工程研究所
    关键词: 介電質放電;氮氧化物控制;濕式法;鍋爐;Dielectric Barrier Discharges;NOx Control Technologies
    日期: 2001-07-30
    上传时间: 2009-09-21 12:13:56 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 為因應民國91年即將實施的加嚴氮氧化物排放標準,工業界目前大多採用燃燒後處理技術(Post Combustion Technology)對NOx排放量進行控制,最常見的應用技術包括有SCR與SNCR等。有鑑於此二法於實際應用上有其使用限制,並可能引發二次污染,因此尋求創新技術改善傳統技術的缺失,同時提升De-NOx處理效率,已成為各國學術界及工業界共同努力的目標。本研究首先利用介電質放電技術進行小型重油鍋爐氮氧化物排放之模場規模(pilot scale)初步控制試驗,再經由實驗室模擬廢氣組成進行實驗室規模之放電研究,探討反應器之介電材質、外電極材質與型式、反應器管徑、內電極規格等各參數對氮氧化物去除率與能量效率之影響,以尋求介電質反應器最佳控制參數。研究中並應用介電質放電技術與濕式法控制氮氧化物時優缺點互補的特性,將兩技術結合以有效提升氮氧化物去除效率,最後並針對此一技術進行初步成本分析,並評估此技術控制氮氧化物之可行性。實廠測試結果顯示,NO、NOx去除率隨供給電壓、供電頻率及乙烯添加劑量增加而上升。當鍋爐操作在小火燃燒條件下,有較佳之NO與NOx去除效率,其中NO去除率最佳可達81%,而最佳NOx去除率只達37%。在多組反應器參數之研究結果中,以石英介電材質、銅片外電極、反應器管外徑2 cm及直徑0.64 cm不銹鋼棒內電極之反應器具有最佳之NO去除效率與能量效率。當介電質放電系統之供給電壓為18 kV、放電區長度20 cm、氣體流量2 lpm、氣體組成為[NO]/[O2]/[CO2]/[H2O] = 250 ppmv:2.5 %:10 %:3.0 %、後端串聯0.1 M之Na2SO3或Na2S洗滌設備時,NOx之去除率分別可達90%與93%。本研究結果證實,以介電質放電系統結合濕式洗滌法去除氮氧化物之技術確實可行,深具發展潛力。 Stricter NOx emission standards have been issued worldwide in recent years because NOx not only leads to the formation of acid deposition and photochemical smog, but also imposes adverse effects on human health, vegetation, and materials. SCR and SNCR are the most common post combustion techniques for removing NOx from stationary sources. However, theses technologies leave some unavoidable disadvantages, such as poisoning of catalysts or narrow temperature windows. In order to improve those limitations, developing more effective techniques for controlling NOx emission has become an important issue in the research and industrial field. In this study, the pilot-scale dielectric barrier discharges (DBD) process were firstly investigated to remove NOx from industrial flue gas of a small oil-fired boiler. Then, we investigated the laboratory-scale DBD reactor combining with wet scrubber for NO and NOx removal. The effects of operational parameters including dielectric material, outer electrode material, reactor diameter, inner electrode type, and scrubber liquors on NOx removal efficiency are experimentally investigated. Experimental results indicate that the DBD reactor with quartz dielectric material, copper film outer electrode, 2 cm outer diameter, and 0.64 cm diameter of stainless steel inner electrode is of the most NO removal efficiency. When DBD combined with Na2SO3 and Na2S solutions, more than 90% of NO and NOx removal efficiency were achieved for the gas stream containing [NO]/[O2]/[CO2]/[H2O] = 250 ppmv:2.5%:10%:3.0%. Experimental results indicated that combining DBD with wet scrubbing to remove NOx was technically feasible.
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