双变截面SCR脱硝系统导流板优化设计
Optimization design of deflector for SCR denitration system with double variable cross-section
-
摘要: 根据某电厂1 000 MW塔式锅炉脱硝系统催化剂首层速度偏差较大的问题，建立了基于CFD仿真分析技术的三维SCR脱硝系统数学模型，对该系统双变截面烟道处的导流板布置方式进行研究，以优化催化剂首层的速度分布。通过对比不同结构导流板下的结果，提出将原始SCR系统的双变截面烟道拆分为X方向和Z方向2个变截面烟道的改造方案。在此结构下重新进行优化设计，改造后系统内的回流区和低速区消除，流场均匀性显著提升，取得了积极的效果。为实际电厂优化调试，解决类似工程问题提供了参考数据。Abstract: Aiming at the problem that the velocity of the first layer of the catalyst in the denitration system of a 1 000 MW coal-fired unit is relatively large, a mathematical model of the three-dimensional SCR denitration system based on CFD simulation technology is established, and the arrangement of the deflector at the double-variable cross-section flue of the system is performed. Research was conducted to optimize the velocity profile of the first layer of the catalyst. By comparing the results of the different structures under the baffle, a reconstruction scheme for splitting the double variable cross-section flue of the original SCR system into two variable cross-section flue ducts in the X direction and the Z direction was proposed. Under this structure, the optimal design was re-optimized. After the transformation, the recirculation zone and the low-speed zone were eliminated. The homogeneity of the flow field was significantly improved, and positive results were achieved. It provides some reference data for the optimization of actual power plants and solving similar engineering problems.
-
-
[1] 刘英进,李杰义,李兵,等.330 MW燃煤机组SCR流场优化及提效改造[J].节能与环保,2017(6):67-71 [2] 沈丹，仲兆平，郭小玲.600 MW电厂SCR烟气脱硝反应器内不同导流板的流场数值模拟[J].电力环境保护,2007,23(1):42-45 [3] 张强.燃煤电站SCR烟气脱硝技术及工程应用[M].北京:化学工业出版社,2007 [4] 刘小波,陈冬林,姜昌伟,等.燃煤锅炉选择性催化还原脱硝反应器结构的模拟优化[J].动力工程学报,2010,30(5):384-389 [5] 陈冬林,刘欢,邹婵,等.300 MW燃煤锅炉烟气SCR脱硝系统流场的数值模拟与优化设计[J].电力科学与技术学报,2013,28(1):103-108 [6] 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 [7] KROCHER O, DEVADAS M, ELSENER M, et al.Investigation of the selective catalytic reduction of NO by NH3 on Fe-ZSM5 monolith catalysts[J].Applied Catalysis B: Environmental,2006,66(3):208-216 10.1016/j.apcatb.2006.03.012 [8] FORZATTI P.Present status and perspectives in de-NOx SCR catalysis[J].Applied Catalysis A: General,2001,222(1):221-236 10.1016/S0926-860X(01)00832-8 [9] 毛剑宏,蒋新伟,钟毅,等.变截面倾斜烟道导流板对AIG入口流场的影响[J].浙江大学学报(工学版),2011,45(8):1453-1457 [10] 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 10.12030/j.cjee.201606009 [11] 陈莲芳,周慎杰,王伟.选择性催化还原烟气脱硝反应器流场的模拟优化[J].动力工程学报,2010,30(3):224-229 [12] 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 [13] 徐妍,李文彦.SCR脱硝反应器导流板的结构设计[J].热力发电，2008,37(10):49-52 [14] 于飞,刘明,李卫东,等.90°矩形截面弯头内置导流板的布置优化研究[J].动力工程学报,2015,35(2):147-152. [15] 李壮扬,苏乐春,宋子健,等.660 MW燃煤机组SCR流场模拟优化与喷氨优化运行[J].洁净煤技术,2017,23(4):47-52 -
点击查看大图
计量
- 文章访问数: 2602
- HTML全文浏览数: 2466
- PDF下载数: 168
- 施引文献: 0
下载:
