SCR催化剂低负荷运行硫酸氢铵失活研究
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摘要
针对国内燃煤机组低负荷运行SCR脱硝系统出现的催化剂因硫酸氢铵(ABS)失活问题,在实验室模拟烟气条件下,对催化剂ABS失活及活性恢复特性进行了研究。结果表明,毛细凝聚作用下的ABS液化-汽化是典型的物理可逆过程,且受到烟气中NH_3与SO_3体积分数的正相关影响。基于这一研究成果,提出了最低连续喷氨温度(MOT)的经验计算公式,该公式可用于评估实际运行烟气条件下的MOT。为指导SCR低负荷运行最佳方案的选择和ABS失活催化剂的活性恢复,在对SCR低负荷运行案例分析基础上,给出了MOT经验计算公式使用原则和方法。
Aimed at the problem of ammonium bisulfate(ABS)deactivated SCR catalyst at low load operation,the characteristics of ABS deactivation and activity recovery are studied in the simulated flue gas environment in laboratory.It indicates that the ABS liquidation-vaporization under capillary condensation is a typical invertible process and the process is positively affected by the concentration of NH_3 and SO_3 in flue gas.In addition,the empirical formula used to evaluate the MOT under the actual operating condition is proposed.Based on the case analysis of the SCR operating at low load,the principle and method to use the experience formula MOT is given to guide the selection of the best plan for SCR operating at low load and the activity recovery of the ABS deactivated catalyst.
Aimed at the problem of ammonium bisulfate(ABS)deactivated SCR catalyst at low load operation,the characteristics of ABS deactivation and activity recovery are studied in the simulated flue gas environment in laboratory.It indicates that the ABS liquidation-vaporization under capillary condensation is a typical invertible process and the process is positively affected by the concentration of NH_3 and SO_3 in flue gas.In addition,the empirical formula used to evaluate the MOT under the actual operating condition is proposed.Based on the case analysis of the SCR operating at low load,the principle and method to use the experience formula MOT is given to guide the selection of the best plan for SCR operating at low load and the activity recovery of the ABS deactivated catalyst.
引文
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[21]鲍强,许辉.福建太平洋电力有限公司1号机组脱硝系统全负荷运行烟气旁路改造性能考核试验报告[R].苏州:西安热工研究院苏州分院,2018.
[2]刘海蛟,程纪东,孙科,等.燃煤电厂宽温催化剂全负荷脱硝的应用研究[J].上海节能,2017(2):64-68.LIU Haijiao,CHENG Jidong,SUN Ke,et al.Study on wide temperature catalyst full load denitrification application at coal-fired power plant[J].Shanghai Energy Conservation,2017(2):64-68.
[3]SHI Yun,TAN Shan,WANG Xiaoxiang,et al.Regeneration of sulfur-poisoned CeO2 catalyst for NH3-SCR of NOx[J].Catalysis Communications,2016,86:67-71.
[4]SONG Liyun,CHAO Jingdi,FAN Yujiao,et al.Promotion of ceria for decomposition of ammonia bisulfate over V2O5-MoO3/TiO2catalyst for selective catalytic reduction[J].Chemical Engineering Journal,2016,303:275-281.
[5]CHRISTOPHER J.Method for enhanced low load SCR operation[C]//Power Plant Pollutant Control and Carbon Management“MEGA”Symposium,MD,Baltimore,2016.
[6]JOAKIM REIMER T,TORBEN S,NATHAN W.Ammonium bisulphate inhibition of SCR catalysts[R].Copenhagen:Haldor Topsoe.
[7]姚宣,郑鹏,郑伟.SCR脱硝系统最低连续喷氨温度的研究[J].中国电力,2016,49(1):146-150.YAO Xuan,ZHENG Peng,ZHENG Wei.Study on minimum continuous-operation temperature of SCR system[J].Electric Power,2016,49(1):146-150.
[8]MARTZ T,MUZIO L J,BOGSETH S,et al.Summary of selective catalytic reduction system operational issues at low load[R].Palo Alto:EPRI,1021028,2010.
[9]CICHANOWICZ J,MUZIO L.Annual operation of selective catalytic reduction system[R].Palo Alto:EPRI,1014928,2007.
[10]毛剑宏,宋浩,吴卫红,等.制备条件对蜂窝状V2O5-WO3/TiO2催化剂孔结构及活性的影响研究[J].动力工程学报,2011,31(4):300-305.MAO Jianhong,SONG Hao,WU Weihong,et al.Influence of preparation conditions on pore structure and activity of V2O5-WO3/TiO2 honeycomb catalysts[J].Journal of Chinese Society of Power Engineering,2011,31(4):300-305.
[11]缪明烽,钟秦,赵金,等.脱硝催化剂孔结构及其脱硝特性的研究[J].污染防治技术,2011,24(4):1-4.MIAO Mingfeng,ZHONG Qin,ZHAO Jin,et al.Study on denitration catalyst pore structure and the denitration characteristics[J].Pollution Control Technology,2011,24(4):1-4.
[12]胡荣泽.评多孔体的表征[J].粉体技术,1995,1(4):26-33.HU Rongze.Comment on the characterization of porous body[J].Powder Science and Technology,1995,1(4):26-33.
[13]MUZIO L,BOGSETH S,HIMES R,et al.Ammonium bisulfate formation and reduced load SCR operation[J].Fuel,2017,206:180-189.
[14]MENASHA J,DUNN-RANKIN D,MUZIO L,et al.Ammonium bisulfate formation temperature in a bench-scale single-channel air preheater[J].Fuel,2011,90(7):2445-2553.
[15]SALEEM A,GALGANO M,INABA S.Hitachi-Zosen DeNOx process for fossil fuel-fired boilers[C]//Proceedings of the Second NOx Control Technology Seminar,Electric Power Research Institute,Denver,1979.
[16]CICHANOWICZ J,MUZIO L,SHIOMOTO G,et al.Operation and maintenance guidelines for selective catalytic reduction systems[R].Palo Alto:EPRI,1004145,2003.
[17]范芸珠,曹发海.硫酸铵热分解反应动力学研究[J].高校化学工程学报,2011,25(2):341-346.FAN Yunzhu,CAO Fahai.Thermal decomposition kinetics of ammonium sulfate[J].Journal of Chemical Engineering of Chinese Universities,2011,25(2):341-346.
[18]李靖华,张桂恩.硫酸氢铵分解动力学及其分解机理的研究[J].物理化学学报,1992,8(1):123-127.LI Jinghua,ZHANG Guien.Investigation of the kinetics and mechanism of decomposition of ammonium hydrogen sulfate[J].ACTA Physico-Chemical Sinica,1992,8(1):123-127.
[19]MATSUDA Shimpei,KAMO Tomoichi,KATO Akira,et al.Deposition of ammonium bisulfate in the selective catalytic reduction of nitrogen oxides with ammonia[J].Industrial&Engineering Chemistry Production Research&Development,1982,21(1):48-52.
[20]宋玉宝,杨杰,金理鹏,等.SCR脱硝催化剂宏观性能评估和寿命预测方法研究[J].中国电力,2016,49(4):17-22.SONG Yubao,YANG Jie,JIN Lipeng,et al.Study on methodology of SCR catalyst macroscopical performance evaluation and lifetime prediction[J].Electric Power,2016,49(4):17-22.
[21]鲍强,许辉.福建太平洋电力有限公司1号机组脱硝系统全负荷运行烟气旁路改造性能考核试验报告[R].苏州:西安热工研究院苏州分院,2018.