催化氧化耦合超重力技术脱除NO_x的研究
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摘要
用Mn Fe Ox气相催化氧化NO,在旋转填充床中以Na OH溶液吸收脱除NO_x。考察模拟烟气中NO的转化率、进口体积分数、吸收液循环使用时间对NO_x脱除率影响,监测了吸收液循环使用时间420 min内的p H值及离子成分。结果表明,NO转化率55. 17%时,NO_x脱除率达93. 42%; NO进口体积分数提升,使NO_x的脱除率先上升后下降;Na OH吸收液循环使用420 min内,NO_x脱除率在90. 8%以上,反应产物为NO-2及少量NO-3,p H值12. 68。
Mn Fe Oxwas used to catalytic oxidation of NO in gas phase and removes NO_xby Na OH solution in a rotating packed bed. The removal efficiency of NO_xwas investigated under various operating conditions including the conversion rate of NO,inlet NO volume fraction and cycling time of the absorption solution in the simulated flue gas. Also,the p H value and ionic composition of the absorption solution were tested at the cycling time of 420 min. The results indicated that the removal efficiency of NO_xis 93. 42% when the conversion rate of NO is 55. 17%. Additionally,NO_xremoval efficiency first increased and then decreased with increasing inlet NO volume fraction. Moreover,the removal efficiency of NO_xwas stable above 90. 8% after420 min of Na OH absorption solution and the main component of the absorption solution was NO-2,the small amount of NO-3 and the p H value of the absorption solution was 12. 68.
Mn Fe Oxwas used to catalytic oxidation of NO in gas phase and removes NO_xby Na OH solution in a rotating packed bed. The removal efficiency of NO_xwas investigated under various operating conditions including the conversion rate of NO,inlet NO volume fraction and cycling time of the absorption solution in the simulated flue gas. Also,the p H value and ionic composition of the absorption solution were tested at the cycling time of 420 min. The results indicated that the removal efficiency of NO_xis 93. 42% when the conversion rate of NO is 55. 17%. Additionally,NO_xremoval efficiency first increased and then decreased with increasing inlet NO volume fraction. Moreover,the removal efficiency of NO_xwas stable above 90. 8% after420 min of Na OH absorption solution and the main component of the absorption solution was NO-2,the small amount of NO-3 and the p H value of the absorption solution was 12. 68.
引文
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[2] Meng X C,Li C,Cui S P,et al. Scenario analysis of denitration for chinese coal-fired power generation[J]. Materials Science Forum,2015,814:425-429.
[3]张萍,潘卫国,郭瑞堂,等.燃煤烟气污染物协同控制技术的研究进展[J].应用化工,2017,46(12):2447-2450.
[4]李建梅,李国栋.中国水泥工业氮氧化物排放现状及对策建议[J].应用化工,2013,42(9):1687-1689.
[5]田爱珍,张艳惠,张忠东,等.降低催化裂化装置再生烟气NOx排放技术研究进展[J].应用化工,2013,42(9):1699-1702.
[6] Chu Y,Zhang T,Guo J,et al. Low temperature selective catalytic reduction of NO by C3H6,over Ce Ox,loaded on AC treated by HNO3[J]. Journal of Rare Earths,2015,33(4):371-381.
[7] Duan K J,Chen B H,Liu Z M,et al. Mn promoted Pd/Ti O2-Al2O3catalyst for the selective catalytic reduction of NOxby H2[J]. Applied Catalysis B:Environmental,2015,176:618-626.
[8] Wejkowski R,Wojnar W. Selective catalytic reduction in a rotary air heater(RAH-SCR)[J]. Journal of the Taiwan Institute of Chemical Engineers,2018,145:367-373.
[9] Pan L Y,Zhou X X,Zhao H,et al. Nanoflower-like Mgdoped MnOxfor facile removal of low-concentration NOxat room temperature[J]. Catalysis Communications,2017,95(5):70-73.
[10]陈焕章,李宏,王丹,等.选择性催化还原脱硝催化剂的研究进展[J].现代化工,2015,35(6):18-21,23.
[11]周惠,黄华存,董文华,等. V2O5-WO3/Ti O2脱硝催化剂的制备及抗硫性能[J].现代化工,2017,37(9):114-118.
[12] Metkar P S,Harold M P,Balakotaiah V. Selective catalytic reduction of NOxon combined Fe-and Cu-zeolite monolithic catalysts:Sequential and dual layer configurations[J]. Applied Catalysis B:Environmental,2012,111:67-80.
[13] Li Y,Chu G,Sun B,et al. Absorption of ammonia into water-in-oil microemulsion in a rotor-stator reactor[J].Chemical Engineering and Processing:Process Intensification,2015,87:68-74.
[14] Luo Y,Chu G,Sang L,et al. A two-stage blade-packing rotating packed bed for intensification of continuous distillation[J]. Chinese Journal of Chemical Engineering,2016,24(1):109-115.
[15]高文雷,曾泽泉,陈建铭,等.旋转填充床中湿法脱硝的研究[J].高校化学工程学报,2014(5):1160-1165.
[16] Zhang L L,Wang J X,Sun Q,et al. Removal of nitric oxide in rotating packed bed by ferrous chelate solution[J].Chemical Engineering Journal,2012,181/182(2):624-629.
[17]谷德银,刘有智,祁贵生,等.新型旋转填料床的气相传质特性[J].过程工程学报,2015,15(1):35-39.
[18] Yu L,L Youzhi,Zhang L,et al. Absorption of NOxinto nitric acid solution in rotating packed bed[J]. Chinese Journal of Chemical Engineering,2010,18(2):244-248.
[19]刘有智,李鹏,李裕,等.超重力法处理高浓度氮氧化物废气中试研究[J].化工进展,2007,26(7):1058-1061.
[20]叶智青.锰-铁催化剂低温催化氧化NO研究[D].昆明:昆明理工大学,2011.