SCR整流格栅高度与催化剂安装耦合影响分析
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摘要
选择性催化还原(SCR)脱硝反应器内均匀的流场、浓度场是保证脱硝效率的前提,以某1 000 MW燃煤机组SCR脱硝反应器为研究对象,对其结构进行了深入研究。通过模拟确定最佳整流格栅间距及高度,继而模拟整流格栅高度与首层催化剂安装高度的比值(c)对首层催化剂流场、浓度场均匀性的耦合影响,并通过实验予以验证。结果表明:格栅间距不宜过大或过小,整流格栅之间的距离0.2 m左右为宜;随c值增大,首层催化剂的速度偏差增大,当c大于一定数值后,不同格栅高度下的速度偏差都会突增;格栅高度0.8 m时,对整流格栅与首层催化剂之间的距离要求最低,c值可放宽到0.8左右。
The uniform flow field and concentration field in the SCR reactor are essential to achieving high denitrification efficiency.In this paper, by taking the SCR denitration reactor of a 1 000 MW coal-fired unit as the research object, its structure is thoroughly studied. The optimal spacing and height of rectifying grille are then determined from digital simulation, and the coupling effect of the ratio of rectifying grille height to the installation height of the first catalyst layer(denoted as c) on the flow field and concentration field uniformity is further simulated and verified through a series of experiment. The results show that the grid spacing should not be too large or too small, which is recommended at around 0.2 m. When the value of c increases, the velocity deviation of the first layer catalyst will increase. When the value of c is greater than certain threshold, the velocity deviations will jump sharply at all different grid heights. Particularly with the grid height at 0.8 m, the distance between the rectifying grille and the first layer catalyst can be increased correspondingly, and the value of c can be relaxed to 0.8.
The uniform flow field and concentration field in the SCR reactor are essential to achieving high denitrification efficiency.In this paper, by taking the SCR denitration reactor of a 1 000 MW coal-fired unit as the research object, its structure is thoroughly studied. The optimal spacing and height of rectifying grille are then determined from digital simulation, and the coupling effect of the ratio of rectifying grille height to the installation height of the first catalyst layer(denoted as c) on the flow field and concentration field uniformity is further simulated and verified through a series of experiment. The results show that the grid spacing should not be too large or too small, which is recommended at around 0.2 m. When the value of c increases, the velocity deviation of the first layer catalyst will increase. When the value of c is greater than certain threshold, the velocity deviations will jump sharply at all different grid heights. Particularly with the grid height at 0.8 m, the distance between the rectifying grille and the first layer catalyst can be increased correspondingly, and the value of c can be relaxed to 0.8.
引文
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[5]雷鉴琦.降低燃煤机组SCR脱硝系统催化剂磨损的流场优化[J].中国电力,2018, 51(7):152-156, 169.LEI Jianqi. Flow field optimization on the catalyst layer breakage failure of the SCR-DeNOx system for a coal-fired power plant[J].Electric Power,2018, 51(7):152-156, 169.
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[7]杨松,丁皓姝,黄越.SCR脱硝系统流场数值模拟及优化[J].热力发电,2014, 43(9):71-75.YANG Song, DING Haoshu, HUANG Yue. Numerical simulation and optimization of flow field in an SCR system[J]. Thermal Power Generation,2014, 43(9):71-75.
[8] BIRKHOLD F, MEINGAST U, WASSERMANN P, et al. Modeling and simulation of the injection of urea-water-solution for automotive SCR systems[J]. Applied Catalysis B:Environmental, 2007, 70(1):119-127.
[9]毛剑宏.大型电站锅炉SCR烟气脱硝系统关键技术研究[D].杭州:浙江大学,2011.
[10]陈太平.300 MW煤粉锅炉SCR烟气脱硝装置数值模拟及结构优化[D].哈尔滨:哈尔滨工业大学,2015.
[11]徐劲.SCR流场及飞灰浓度分布优化数值模拟和实验研究[D].保定:华北电力大学,2017.
[12]周志明,樊卫国,董立春.选择性催化还原脱硝系统烟道中导流板设计数值模拟[J].重庆大学学报(自然科学版),2009, 32(10):1187-1192.ZHOU Zhiming, FAN Weiguo, DONG Lichun. Design and numerical simulation for flow deflector in the gas flue of selective catalytic reduction denitrification system[J]. Journal of Chongqing University(Natural Science),2009, 32(10):1187-1192.
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[14]赵大周,王传奇,司风琪,等.选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响[J].热力发电,2016, 45(2):29-33.ZHAO Dazhou, WANG Chuanqi, SI Fengqi, et al. Influence of inlet velocity field and component concentration distribution on de-NOx efficiency of SCR denitration systems[J]. Thermal Power Generation,2016, 45(2):29-33.
[15]汪洋,崔一尘,吴树志,等.脱硝反应器烟气整流格栅流场数值模拟研究[J].热力发电,2009, 38(11):28-34.WANG Yang, CUI Yichen, WU Shuzhi, et al. Study on numerical simulation of flow field in the denitrification reactor with gas straightening gratings[J]. Thermal Power Generation, 2009, 38(11):28-34.
[16]李凡.某600 MW机组SCR反应器流场模拟及改造研究[D].保定:华北电力大学,2016.
[17]张文志,曾毅夫.SCR脱硝系统烟道内流场优化[J].环境工程学报,2015, 9(2):883-887.ZHANG Wenzhi, ZENG Yifu. Optimization of flow field in the SCR denitrification system[J]. Chinese Journal of Environmental Engineering, 2015, 9(2):883-887.
[18]孙虹,华伟,黄治军,等.基于CFD建模的1 000 MW电站锅炉SCR脱硝系统喷氨策略优化[J].动力工程学报,2016, 36(10):810-815, 821.SUN Hong, HUA Wei, HUANG Zhijun, et al. CFD-based numerical simulations on optimization of the ammonia spraying strategy in a1 000 MW SCR denitrification system[J]. Journal of Chinese Society of Power Engineering,2016, 36(10):810-815, 821.
[19]徐秀林.SCR蜂窝状脱硝催化剂磨损研究[D].杭州:浙江大学,2015.
[20]高建强,陈元金,殷立宝.富氧燃烧烟气气氛下酸再生催化剂性能测试[J].广东电力,2017, 30(5):11-14.GAO Jianqiang, CHEN Yuanjin, YIN Libao. Performance test onacid regeneration catalyst in oxygen-enriched flue gas atmosphere[J].Guangdong Electric Power, 2017, 30(5):11-14.
[21]安敬学,王磊,秦淇,等.电站锅炉脱硝系统催化剂磨损数值模拟[J].锅炉技术,2016, 47(2):32-38, 42.AN Jingxue, WANG Lei, QIN Qi, et al. Study and governance of SCR catalyst attrition based on the numerical simulation and testing[J]. Boiler Technology, 2016, 47(2):32-38, 42.
[22]刘涛.SCR多元催化剂脱硝性能试验研究及数值模拟[D].南京:东南大学,2006.
[23]赵大周,刘沛奇,何胜,等.燃煤电站SCR烟气脱硝CFD技术的研究进展[J].中国电力,2016, 49(8):157-161.ZHAO Dazhou, LIU Peiqi, HE Sheng, et al. Research progress of CFD-based SCR flue gas De-NOx technology for coal-fired power plants[J]. Electric Power, 2016, 49(8):157-161.
[2]张洋.烟气脱硫脱硝技术的现状及发展分析[J].科技资讯,2016,14(16):69-70, 72.ZHANG Yang. Current situation and development analysis of flue gas desulfurization and denitrification technology[J]. Science&Technology Information, 2016, 14(16):69-70, 72.
[3]何金亮,金理鹏,卢承政,等.燃煤电站SCR烟气脱硝系统运行典型故障诊断[J].中国电力,2016,49(8):148-153.HE Jinliang, JIN Lipeng, LU Chengzheng, et al. Diagnosis of typical operation faults of SCR flue gas denitrification system in coal-fired power plants[J]. Electric Power, 2016, 49(8):148-153.
[4]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.
[5]雷鉴琦.降低燃煤机组SCR脱硝系统催化剂磨损的流场优化[J].中国电力,2018, 51(7):152-156, 169.LEI Jianqi. Flow field optimization on the catalyst layer breakage failure of the SCR-DeNOx system for a coal-fired power plant[J].Electric Power,2018, 51(7):152-156, 169.
[6]于帅.燃煤电厂烟气脱硝装置的优化仿真设计研究[D].保定:华北电力大学,2013.
[7]杨松,丁皓姝,黄越.SCR脱硝系统流场数值模拟及优化[J].热力发电,2014, 43(9):71-75.YANG Song, DING Haoshu, HUANG Yue. Numerical simulation and optimization of flow field in an SCR system[J]. Thermal Power Generation,2014, 43(9):71-75.
[8] BIRKHOLD F, MEINGAST U, WASSERMANN P, et al. Modeling and simulation of the injection of urea-water-solution for automotive SCR systems[J]. Applied Catalysis B:Environmental, 2007, 70(1):119-127.
[9]毛剑宏.大型电站锅炉SCR烟气脱硝系统关键技术研究[D].杭州:浙江大学,2011.
[10]陈太平.300 MW煤粉锅炉SCR烟气脱硝装置数值模拟及结构优化[D].哈尔滨:哈尔滨工业大学,2015.
[11]徐劲.SCR流场及飞灰浓度分布优化数值模拟和实验研究[D].保定:华北电力大学,2017.
[12]周志明,樊卫国,董立春.选择性催化还原脱硝系统烟道中导流板设计数值模拟[J].重庆大学学报(自然科学版),2009, 32(10):1187-1192.ZHOU Zhiming, FAN Weiguo, DONG Lichun. Design and numerical simulation for flow deflector in the gas flue of selective catalytic reduction denitrification system[J]. Journal of Chongqing University(Natural Science),2009, 32(10):1187-1192.
[13]范红梅,仲兆平,金保升,等.蜂窝状催化剂脱硝过程数值计算[J].热能动力工程,2007, 22(4):450-456, 472.FAN Hongmei, ZHONG Zhaoping, JIN Baosheng, et al. Numerical calculation of a honeycomb-shaped catalyst denitration process[J].Journal of Engineering for Thermal Energy and Power, 2007, 22(4):450-456, 472.
[14]赵大周,王传奇,司风琪,等.选择性催化还原烟气脱硝系统速度场及组分分布对脱硝效率的影响[J].热力发电,2016, 45(2):29-33.ZHAO Dazhou, WANG Chuanqi, SI Fengqi, et al. Influence of inlet velocity field and component concentration distribution on de-NOx efficiency of SCR denitration systems[J]. Thermal Power Generation,2016, 45(2):29-33.
[15]汪洋,崔一尘,吴树志,等.脱硝反应器烟气整流格栅流场数值模拟研究[J].热力发电,2009, 38(11):28-34.WANG Yang, CUI Yichen, WU Shuzhi, et al. Study on numerical simulation of flow field in the denitrification reactor with gas straightening gratings[J]. Thermal Power Generation, 2009, 38(11):28-34.
[16]李凡.某600 MW机组SCR反应器流场模拟及改造研究[D].保定:华北电力大学,2016.
[17]张文志,曾毅夫.SCR脱硝系统烟道内流场优化[J].环境工程学报,2015, 9(2):883-887.ZHANG Wenzhi, ZENG Yifu. Optimization of flow field in the SCR denitrification system[J]. Chinese Journal of Environmental Engineering, 2015, 9(2):883-887.
[18]孙虹,华伟,黄治军,等.基于CFD建模的1 000 MW电站锅炉SCR脱硝系统喷氨策略优化[J].动力工程学报,2016, 36(10):810-815, 821.SUN Hong, HUA Wei, HUANG Zhijun, et al. CFD-based numerical simulations on optimization of the ammonia spraying strategy in a1 000 MW SCR denitrification system[J]. Journal of Chinese Society of Power Engineering,2016, 36(10):810-815, 821.
[19]徐秀林.SCR蜂窝状脱硝催化剂磨损研究[D].杭州:浙江大学,2015.
[20]高建强,陈元金,殷立宝.富氧燃烧烟气气氛下酸再生催化剂性能测试[J].广东电力,2017, 30(5):11-14.GAO Jianqiang, CHEN Yuanjin, YIN Libao. Performance test onacid regeneration catalyst in oxygen-enriched flue gas atmosphere[J].Guangdong Electric Power, 2017, 30(5):11-14.
[21]安敬学,王磊,秦淇,等.电站锅炉脱硝系统催化剂磨损数值模拟[J].锅炉技术,2016, 47(2):32-38, 42.AN Jingxue, WANG Lei, QIN Qi, et al. Study and governance of SCR catalyst attrition based on the numerical simulation and testing[J]. Boiler Technology, 2016, 47(2):32-38, 42.
[22]刘涛.SCR多元催化剂脱硝性能试验研究及数值模拟[D].南京:东南大学,2006.
[23]赵大周,刘沛奇,何胜,等.燃煤电站SCR烟气脱硝CFD技术的研究进展[J].中国电力,2016, 49(8):157-161.ZHAO Dazhou, LIU Peiqi, HE Sheng, et al. Research progress of CFD-based SCR flue gas De-NOx technology for coal-fired power plants[J]. Electric Power, 2016, 49(8):157-161.