洁净煤技术
潔淨煤技術
길정매기술
CLEAN COAL TECHNOLOGY
2015年
2期
51-55
,共5页
周皞%廖文裕%苏亚欣%林越辛
週皞%廖文裕%囌亞訢%林越辛
주호%료문유%소아흔%림월신
NO还原%甲烷%铁%氧化铁%H2O%SO2
NO還原%甲烷%鐵%氧化鐵%H2O%SO2
NO환원%갑완%철%양화철%H2O%SO2
NO reduction%methane%iron%iron oxides%H2 O%SO2
为考察烟气中H2 O和SO2对甲烷在金属铁表面还原NO的影响，采用程序控温电加热水平陶瓷管反应器，在N2气氛和模拟烟气气氛中、300~1100℃下进行了脱硝实验研究，并对反应后铁样品的组成进行了X光衍射（ XRD）、场发射扫描电镜（ ESEM）和X 射线能谱（ EDX）分析。结果表明：在N2气氛中H2 O及SO2在高温下与NO竞争和金属铁反应，对金属铁还原NO有轻微的抑制作用。在加入甲烷的模拟烟气中，H2 O和SO2共存对甲烷在金属铁表面还原NO有一定促进作用。水蒸气在高温下对金属铁的氧化过程中，会生成更多相对疏松的Fe2 O3氧化层，有利于NO向内扩散与金属铁反应。加入7% H2 O和0.02% SO2的模拟烟气，反应段过量空气系数SR1＝0.7和燃烬段过量空气系数SR2＝1.2时，在1000℃，有、无H2 O及SO2时脱硝效率分别为96.9%和90.6%。
為攷察煙氣中H2 O和SO2對甲烷在金屬鐵錶麵還原NO的影響，採用程序控溫電加熱水平陶瓷管反應器，在N2氣氛和模擬煙氣氣氛中、300~1100℃下進行瞭脫硝實驗研究，併對反應後鐵樣品的組成進行瞭X光衍射（ XRD）、場髮射掃描電鏡（ ESEM）和X 射線能譜（ EDX）分析。結果錶明：在N2氣氛中H2 O及SO2在高溫下與NO競爭和金屬鐵反應，對金屬鐵還原NO有輕微的抑製作用。在加入甲烷的模擬煙氣中，H2 O和SO2共存對甲烷在金屬鐵錶麵還原NO有一定促進作用。水蒸氣在高溫下對金屬鐵的氧化過程中，會生成更多相對疏鬆的Fe2 O3氧化層，有利于NO嚮內擴散與金屬鐵反應。加入7% H2 O和0.02% SO2的模擬煙氣，反應段過量空氣繫數SR1＝0.7和燃燼段過量空氣繫數SR2＝1.2時，在1000℃，有、無H2 O及SO2時脫硝效率分彆為96.9%和90.6%。
위고찰연기중H2 O화SO2대갑완재금속철표면환원NO적영향，채용정서공온전가열수평도자관반응기，재N2기분화모의연기기분중、300~1100℃하진행료탈초실험연구，병대반응후철양품적조성진행료X광연사（ XRD）、장발사소묘전경（ ESEM）화X 사선능보（ EDX）분석。결과표명：재N2기분중H2 O급SO2재고온하여NO경쟁화금속철반응，대금속철환원NO유경미적억제작용。재가입갑완적모의연기중，H2 O화SO2공존대갑완재금속철표면환원NO유일정촉진작용。수증기재고온하대금속철적양화과정중，회생성경다상대소송적Fe2 O3양화층，유리우NO향내확산여금속철반응。가입7% H2 O화0.02% SO2적모의연기，반응단과량공기계수SR1＝0.7화연신단과량공기계수SR2＝1.2시，재1000℃，유、무H2 O급SO2시탈초효솔분별위96.9%화90.6%。
In order to investigate the effects of H2 O and SO2 on NO reduction by methane on the surface of iron,the NO reduction efficien-cy was tested at 300 ℃ to 1100 ℃ in an programmed electric heating horizontal ceramic tube reactor in N2 and simulated flue gas atmos-phere respectively. The component of iron samples after reaction were analyzed by XRD,ESEM and EDX. The results demonstrated that in N2 atmosphere,H2 O and SO2 reacted with iron in the competition reaction with NO on the surface of iron which inhabited NO reduction. In the simulated flue gas atmosphere,H2 O and SO2 promoted NO reduction by methane on the surface of iron. The formation of porous oxide layer of Fe2 O3 caused by the oxidation of water vapor on iron,enhanced the interaction of NO with metallic iron and then improved NO re-ductionefficiency.Whentheexcessairratiowas0.7inreactionzone(SR1)and1.2inburnoutzone(SR2),theNOreductionefficiency at 1000 ℃ was 96. 9% in the presence of 7% H2 O and 0. 02% SO2 ,compared with the value of 90. 6% in the absence of H2 O and SO2 .
