SCR脱硝系统流场优化改造关键技术研究
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摘要
某发电厂1号锅炉600 MW机组SCR脱硝系统出口NOX浓度分布严重不均匀,氨逃逸量高导致空气预热器硫酸氢氨沉积和堵塞,影响机组安全稳定运行。对机组开展了流场优化技术改造,在流场优化改造前后均进行了脱硝系统入口流场测量,同时开展改造后脱硝系统进、出口NOX浓度和氨逃逸量测量,为准确评估流场优化改造效果提供了重要依据。研究结果表明:流场优化改造后脱硝入口流场均匀性得到显著提高。
There was uneven NOXconcentration distribution at SCR denitration outlet of a 600 MW unit of boiler No.1 in a power plant, extensive ammonia escape results in ammonium hydrogen sulfate deposition and blockage in air preheater, which influences unit operation safety and stability. Flow field transformation was conducted, and inlet flow field measurements before and after the transformation were performed; besides,inlet and outlet NOXconcentrations and ammonia escape after the transformation were measured, which provides a basis for the accurate evaluation of flow field optimization effect. The research shows that unevenness of inlet flow field of the denitration system is significantly improved after the transformation.
There was uneven NOXconcentration distribution at SCR denitration outlet of a 600 MW unit of boiler No.1 in a power plant, extensive ammonia escape results in ammonium hydrogen sulfate deposition and blockage in air preheater, which influences unit operation safety and stability. Flow field transformation was conducted, and inlet flow field measurements before and after the transformation were performed; besides,inlet and outlet NOXconcentrations and ammonia escape after the transformation were measured, which provides a basis for the accurate evaluation of flow field optimization effect. The research shows that unevenness of inlet flow field of the denitration system is significantly improved after the transformation.
引文
[1]陈磊,李德波,周杰联,等.燃煤电厂SCR脱硝系统运行存在关键技术问题研究与技术展望[J].浙江电力,2018,37(10):87-90.
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[3]陈前明,方庆艳,张成,等.墙式分离燃尽风对660 MW切圆燃烧锅炉烟温偏差影响的数值模拟研究[J].广东电力,2016,29(7):16-23.
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[5]李德波,廖永进,曾庭华,等.SCR脱硝系统喷氨格栅调整试验关键问题探究[J].广东电力,2016,29(7):11-15.
[6]李德波,曾庭华,廖永进,等.600 MW电站锅炉SCR脱硝系统全负荷投运改造方案研究与工程实践[J].广东电力,2016,29(6):12-17.
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[9]李超.加装SCR脱硝装置对空预器冷端腐蚀的影响解析[J].中国电力,2018,51(5):47-51.
[10]苗永旗,刘海秋,周凯,等.某330 MW机组烟气脱硝系统超低排放性能诊断与分析[J].中国电力,2018,51(4):124-129.
[11]黄飞,周健,谢新华,等.百万机组塔式炉脱硝供氨系统优化设计应用研究[J].热能动力工程,2018,33(7):99-113.
[12]董锐锋,吴文龙,王锋涛,等.燃煤电厂超低排放改造后烟道氯化铵结晶原因分析及对策[J].热力发电,2018,47(3):128-134.
[13]郭义杰.100 MW燃煤锅炉硫酸氢铵堵塞空气预热器原因分析及应对措施[J].广东电力,2016,29(9):1-6.
[14]李二欣,王特,韦飞.燃煤电厂SCR脱硝系统尿素热解制氨技术节能改造[J].广东电力,2018,31(3):27-31.
[15]王乐乐,何川,王凯,等.SCR脱硝催化剂低负荷运行评估技术研究与应用[J].热力发电,2018,47(10):24-30.
[16]于玉真,李伟亮,王绍龙,等.SCR脱硝系统流道均流装置数值模拟与优化[J].中国电机工程学报,2018,38(24):7304-7313.
[17]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.
[18]田原润,马剑宇.1 000 MW机组烟气脱硝系统烟道流场优化[J].热力发电,2018,47(6):50-56.
[19]陈鸿伟,赵宝宁,张千等.烟气飞灰对SCR脱硝催化剂的磨损性能试验研究[J].动力工程学报,2018,38(4):286-290.
[20]金理鹏,谢新华,黄飞,等.SCR脱硝装置大颗粒灰拦截技术试验研究[J].中国电力,2018,51(2):156-161.
[21]庄柯,姚杰,吴碧君,等.脱硝反应器内烟气与飞灰分布差异的数值模拟[J].中国电力,2018,51(2):137-142.
[22]王为术,上官闪闪,姚明宇,等.300 MW燃煤锅炉SCR脱硝系统导流装置的设计优化[J].煤炭学报,2015,40(7):1634-1640.
[23]王为术,上官闪闪,路统,等.600 MW燃煤锅炉SCR系统烟道导流板设计[J].郑州大学学报(工学版),2015,36(4):37-40.
[2]李德波,李方勇,许凯,等.四角切圆锅炉变CCOFA与SOFA配比下燃烧特性数值模拟[J].广东电力,2016,29(1):1-7.
[3]陈前明,方庆艳,张成,等.墙式分离燃尽风对660 MW切圆燃烧锅炉烟温偏差影响的数值模拟研究[J].广东电力,2016,29(7):16-23.
[4]廖永进,冯晓鸣,蒋婷,等.SCR脱硝系统催化剂性能预测方法及实践[J].广东电力,2016,29(3):8-10.
[5]李德波,廖永进,曾庭华,等.SCR脱硝系统喷氨格栅调整试验关键问题探究[J].广东电力,2016,29(7):11-15.
[6]李德波,曾庭华,廖永进,等.600 MW电站锅炉SCR脱硝系统全负荷投运改造方案研究与工程实践[J].广东电力,2016,29(6):12-17.
[7]杨群发,张桂平,侯剑雄,等.600 MW机组超净排放技术工程实践及系统优化[J].广东电力,2016,29(8):1-6.
[8]方朝君,卢承政,白晓龙.SCR脱硝系统超低排放运行优化技术研究[J].中国电力,2018,51(2):143-148.
[9]李超.加装SCR脱硝装置对空预器冷端腐蚀的影响解析[J].中国电力,2018,51(5):47-51.
[10]苗永旗,刘海秋,周凯,等.某330 MW机组烟气脱硝系统超低排放性能诊断与分析[J].中国电力,2018,51(4):124-129.
[11]黄飞,周健,谢新华,等.百万机组塔式炉脱硝供氨系统优化设计应用研究[J].热能动力工程,2018,33(7):99-113.
[12]董锐锋,吴文龙,王锋涛,等.燃煤电厂超低排放改造后烟道氯化铵结晶原因分析及对策[J].热力发电,2018,47(3):128-134.
[13]郭义杰.100 MW燃煤锅炉硫酸氢铵堵塞空气预热器原因分析及应对措施[J].广东电力,2016,29(9):1-6.
[14]李二欣,王特,韦飞.燃煤电厂SCR脱硝系统尿素热解制氨技术节能改造[J].广东电力,2018,31(3):27-31.
[15]王乐乐,何川,王凯,等.SCR脱硝催化剂低负荷运行评估技术研究与应用[J].热力发电,2018,47(10):24-30.
[16]于玉真,李伟亮,王绍龙,等.SCR脱硝系统流道均流装置数值模拟与优化[J].中国电机工程学报,2018,38(24):7304-7313.
[17]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.
[18]田原润,马剑宇.1 000 MW机组烟气脱硝系统烟道流场优化[J].热力发电,2018,47(6):50-56.
[19]陈鸿伟,赵宝宁,张千等.烟气飞灰对SCR脱硝催化剂的磨损性能试验研究[J].动力工程学报,2018,38(4):286-290.
[20]金理鹏,谢新华,黄飞,等.SCR脱硝装置大颗粒灰拦截技术试验研究[J].中国电力,2018,51(2):156-161.
[21]庄柯,姚杰,吴碧君,等.脱硝反应器内烟气与飞灰分布差异的数值模拟[J].中国电力,2018,51(2):137-142.
[22]王为术,上官闪闪,姚明宇,等.300 MW燃煤锅炉SCR脱硝系统导流装置的设计优化[J].煤炭学报,2015,40(7):1634-1640.
[23]王为术,上官闪闪,路统,等.600 MW燃煤锅炉SCR系统烟道导流板设计[J].郑州大学学报(工学版),2015,36(4):37-40.