超超临界机组SCR脱硝系统大颗粒灰拦截技术
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摘要
针对烟气携带大颗粒灰到催化剂表面导致催化剂堵塞影响了SCR脱硝设备正常运行的情况,采用优化烟道流场设计、加装褶皱式拦截网及安装空气炮吹灰装置等方案后,可有效防止大颗粒灰进入SCR脱硝反应器,为同类型机组解决催化剂堵塞问题提供参考。
To solve the blocking problem existing on the surface of catalysts caused by large particles entrained by flue gas, which has negative effect on operation of the selective catalytic reduction(SCR) denitrification system, following countermeasures were proposed and taken, such as optimizing the design of flow path flow field, adding pleated interception screen as well as installing soot blower, etc. Results show that after taking above countermeasures, the large particles can be captured effectively before the flue gas flowing into the SCR denitrification unit. This may service as a reference for similar units to deal with the blocking problem in relevant catalysts.
To solve the blocking problem existing on the surface of catalysts caused by large particles entrained by flue gas, which has negative effect on operation of the selective catalytic reduction(SCR) denitrification system, following countermeasures were proposed and taken, such as optimizing the design of flow path flow field, adding pleated interception screen as well as installing soot blower, etc. Results show that after taking above countermeasures, the large particles can be captured effectively before the flue gas flowing into the SCR denitrification unit. This may service as a reference for similar units to deal with the blocking problem in relevant catalysts.
引文
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[3] 高正阳, 郑双清, 钟俊, 等. 粒径对燃煤电站飞灰元素质量分数分布的影响[J]. 动力工程学报, 2013, 33(9): 722-727, 738.
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[6] 周宇昊. SCR催化剂脱硝性能的试验研究与数值模拟[J]. 绿色科技, 2017(18): 191-193.
[7] 庄烨, 张东辉, 褚玥, 等. SCR脱硝在燃煤电厂超低排放中的适用性分析[J]. 环境工程学报, 2017, 11(7): 4183-4189.
[8] 陈鸿伟, 罗敏, 王远鑫, 等. 燃煤锅炉飞灰对SCR脱硝催化剂的影响及预防措施[J]. 燃烧科学与技术, 2017, 23(3): 200-211.
[2] 王妨. SCR脱硝技术在燃煤热电厂的应用探究[J]. 能源与环境, 2017(5): 16-17, 19.
[3] 高正阳, 郑双清, 钟俊, 等. 粒径对燃煤电站飞灰元素质量分数分布的影响[J]. 动力工程学报, 2013, 33(9): 722-727, 738.
[4] BUZANOWSKI M A, CRAWFORD R B, HALL I S, et al. Apparatus and methods for large particle ash separation from flue gas using screens having semi-elliptical cylinder surfaces: US 8936662[P]. 2015-01-20.
[5] 汪洋, 胡永锋. 燃煤电站SCR脱硝系统预防大颗粒灰堵塞方法[J]. 电力科技与环保, 2012, 28(2): 17-19.
[6] 周宇昊. SCR催化剂脱硝性能的试验研究与数值模拟[J]. 绿色科技, 2017(18): 191-193.
[7] 庄烨, 张东辉, 褚玥, 等. SCR脱硝在燃煤电厂超低排放中的适用性分析[J]. 环境工程学报, 2017, 11(7): 4183-4189.
[8] 陈鸿伟, 罗敏, 王远鑫, 等. 燃煤锅炉飞灰对SCR脱硝催化剂的影响及预防措施[J]. 燃烧科学与技术, 2017, 23(3): 200-211.