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研究生:楊士朝
研究生(外文):Ynag, Shyh Chaur
論文名稱:以低溫電漿去除氮氧化物之可行性研究
論文名稱(外文):De-NOX Plasma Process with Hydrocarbon Additive via Dielectric Barrier Discharges
指導教授:張木彬張木彬引用關係
指導教授(外文):Chang Moo-Been
學位類別:碩士
校院名稱:國立中央大學
系所名稱:環境工程學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:2
中文關鍵詞:電漿介電質放電氮氧化物乙炔乙烯
外文關鍵詞:Plasmadielectric barrier dischargesDe-NOXNitrogen oxidesacetyleneethylene
相關次數:
  • 被引用被引用:7
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  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
摘 要為因應日趨嚴格的氮氧化物排放標準,工
業界目前大多採用燃燒後處理技術(Post Combustion Technology)對
NOx進行控制,最常見的應用技術包括有選擇性觸媒還原法(SCR)與選擇
性非觸媒還原法(SNCR)等。有鑑於此二法於實際應用上各有其使用限制
,甚至可能引發二次污染,因此尋求創新技術以改善傳統技術的缺失,並
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。
本研究嘗試以實驗室規模之介電質放電系統,針對氮氧化物進行低溫電漿
處理,其中並添加碳氫化合物(C2H2或C2H4)參與De-NOx反應。藉由操作
電壓、反應氣體配比組成、氧氣含量、操作溫度、水氣含量、氣體流量及
停留時間等重要參數之控制,探討介電質放電系統對一氧化氮及氮氧化物
的去除效率、以及放電後產物的分布情形,以測試此系統之最佳操作條件
。最後,並藉由操作電壓的改變,了解探討介電質放電系統的能量損耗情
形。研究結果顯示,以乙炔為添加劑,當施加電壓為20kV、氣流溫度
為140℃、停留時間為9.4秒、氣體濃度配比為[NO]/[C2H2]/[H2O]/[O2]
=500ppm:1,500ppm:3%:5%時,所獲得之一氧化氮及氮氧化物去除率分
別可達91.2%及68.2%;在相同施加電壓、氣流溫度與停留時間下,以乙烯
為添加劑,且氣體濃度配比為[NO]/[C2H4]/[H2O]/[O2] =500ppm:2,000
ppm:3%:5%時,所獲得之一氧化氮及氮氧化物去除率則分別可達100%
及56.6%。終產物分佈方面,以乙炔為添加劑時,若氣流中不含水氣,產
物以NO2、N2O、CO2、CO為主;若氣流中含有水氣,放電後的產物以NO2、
N2O、CO2、CO、CH2O2為主。以乙烯為添加劑時,若氣流中不含水氣,產
物以NO2、N2O、CO2、CO、CH2O2為主;若氣流中含有水氣,產物則以NO2
、N2O、CO2、CO、CH2O2、CH2O為主。在放電後的尾氣中,均發現有微量
(約15ppm以下)的HCN的生成。本研究已證實介電質放電系統配合添加碳
氫化合物以處理氮氧化物於技術上確實可行,深具發展潛力。
AbstractNitrogen oxides (NOX) are not
only known as primary precursors to acid deposition and urban
smog, but also have adverse effects on human health, vegetation,
visibility and materials. As a result, most common post
combustion De-NOX processes, like SCR and SNCR, are applied for
stationary emission control. However, these technologies leave
some unavoidable disadvantages, such as poisoning of catalysts
or narrow temperature windows. In order to improving those
limitations when applying, inventing less pollution and more
effective techniques has become an important issue in the
research and industrial field. In this study, effective
removal of NOX through generation of hydrocarbon radicals via
dielectric barrier discharges (DBD) was demonstrated. A
laboratory-scale experimental system was designed and
constructed to evaluate the removal efficiency of NO and NOX.
In addition, C2H2 and C2H4 were chosen as additive reducing
agents in the DBD De-NOX process. The effects of operational
parameters including applied voltage, additive concentration,
gas composition, gas temperature, gas residence time, and power
input on the removal efficiency of NO and NOX were investigated.
Generally, experimental results indicated the removal efficiency
of NO and NOX increased with applied voltage, additive
concentration, gas temperature, H2O(g) content, gas residence
time, and power input. As oxygen content increased, hydrocarbon
radicals would be oxidized to CO2 easily. Such a phenomenon
decreased the removal efficiency of NOX. When C2H2 was added to
DBD process, as high as 91.2% of NO and 68.2% of NOX were
removed at 140℃ for the gas stream containing [NO]/[C2H2]/[H2
O]/[O2] =500ppm:1,500ppm:3%:5%. The applied voltage was 20kV
and the gas residence time was 9.4 seconds. In addition to N2
and H2O, major products found in this process included NO2, N2O,
CO2, CO and CH2O2, depending on H2O(g) content of the gas
stream.On the other hand, if C2H4 was used at the same
conditions of applied voltage, gas temperature and gas residence
time, as high as 100% of NO and 56.6% of NOX were removed for
the gas stream containing [NO]/[C2H4]/[H2O]/[O2] =500ppm:2,000
ppm:3%:5%. In addition to N2 and H2O, major products found in
this process included NO2, N2O, CO2, CO, CH2O2 and CH2O,
depending on H2O(g) content of the gas stream.
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