高级搜索

基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造

downloadPDF

上一篇

下一篇

李曈. 基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造[J]. 环境工程学报, 2018, 12(4): 1112-1119. doi: 10.12030/j.cjee.201708089
引用本文: 李曈. 基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造[J]. 环境工程学报, 2018, 12(4): 1112-1119. doi: 10.12030/j.cjee.201708089
shu
LI Tong. Ultra-low emission reconstruct of denitrification system based on NOx uniformity test of SCR reactor[J]. Chinese Journal of Environmental Engineering, 2018, 12(4): 1112-1119. doi: 10.12030/j.cjee.201708089
Citation: LI Tong. Ultra-low emission reconstruct of denitrification system based on NOx uniformity test of SCR reactor[J]. Chinese Journal of Environmental Engineering, 2018, 12(4): 1112-1119. doi: 10.12030/j.cjee.201708089
shu

基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造

  • 1.

    大唐东北电力试验研究所有限公司，长春130012

  • 基金项目:

Ultra-low emission reconstruct of denitrification system based on NOx uniformity test of SCR reactor

  • 1.

    Datang Northeast Electric Power Test & Research Institute, Changchun 130012，China

  • Fund Project:

  • 摘要: 以东北地区某350 MW火电机组为研究对象，对其超低排放改造后的脱硝系统择性催化还原(selective catalytic reduction，SCR)反应器进行性能测试，利用所获数据绘制等高线图和折线图，研究并分析了SCR反应器出、入口烟气流场和NOx浓度场的分布特性。结果显示，脱硝系统平均效率为97.37%，SCR反应器出口NOx平均浓度为13.31 mg·m-3，均达设计要求（脱硝效率≥91.1%，出口浓度≤40 mg·m-3），总体脱硝性能表现良好。结果表明：入口NOx均匀度较好；甲、乙侧反应器出口烟道NOx浓度的离散度分别为31.49%、56.90%，高于设计值（≤15%），出口NOx分布不均匀。技术改造使得该机组SCR反应器出口NOx浓度满足了超低排放限值的要求（≤50 mg·m-3），却在喷氨优化调整、喷氨格栅清理以及催化剂压差控制等方面存在不足。在增加新催化剂层的基础上，对于催化剂层结构疏通、喷氨自动控制、烟气流场的校核与改造等方面仍有提升的空间。
    Abstract: A 350 MW thermal power unit in northeastern China is taken as the research object, and the performance of the SCR reactor of denitrification system after ultra-low emission reconstruct is tested. Using the data obtained by drawing contour lines and line graphs, the distribution characteristics of outlet and inlet flue gas flow and NOx concentration field of SCR reactor were studied and analyzed. The results shows that the average efficiency of the denitration system is 97.37%, and the average NOx concentration at the outlet of the SCR reactor is 13.31 mg·m-3, which has reached the design requirement (efficiency≥91.1%, outlet concentration ≤40 mg·m-3), and the overall denitrification performance is pretty good. It is known from the results that the uniformity of the inlet NOx concentration is good. the dispersion of NOx concentration at the outlet flue of the A and B side reactors were 31.49% and 56.90%, which are more than the design value (≤15%), so the outlet NOx distribution is uneven. This technical reconstruct makes the SCR reactor outlet NOx concentration to meet the ultra-low emission limit requirements (≤50 mg·m-3), but in the spray ammonia optimization adjustment, the ammonia injection grid cleaning and catalyst pressure control and other aspects of the existence of defects. On the basis of adding new catalyst layer, there is still room for improvement in the dredging of the catalyst layer, the automatic control of ammonia injection, the checking and modification of the flue gas flow field.
  • 加载中
  • [1] 袁宝珊，曹晋军.氮氧化物遗传毒性和致癌性研究进展[J].甘肃环境研究与监测，1998 (1):48-51
    [2] 王子亮.光化学烟雾及其化学特征[J].宁波大学学报(理工版)，2005，18(2):224-226
    [3] 刘军.浅谈光化学烟雾的形成、危害及防治措施[J].黑龙江科技信息，2011(10):47-47
    [4] SHI Y，XIA Y F， LU B H，et al.Emission inventory and trends of NOx for China ,2000-2020 [J].Journal of Zhejiang University-Science A(Applied Physics & Engineering)，2014，15(6):454-464 10.1631/jzus.A1300379
    [5] 谭青，冯雅晨.我国烟气脱硝行业现状与前景及SCR脱硝催化剂的研究进展[J].化工进展，2011，30(S1):709-713
    [6] 杨超，程华，黄碧纯.抗SO2和H2O中毒的低温NH3-SCR脱硝催化剂研究进展[J].化工进展，2014，33(4):907-913 10.3969/j.issn.1000-6613.2014.04.020
    [7] JIANG H, WANG Q, WANG H, et al.MOF-74 as an eficient catalyst for the low-temperature selective catalytic reduction of NOx with NH3[J].ACS Applied Materials & Interfaces, 2016，8(40):26817-26826 10.1021/acsami.6b08851
    [8] GUO J, LI C T, LU P, et al.Research on SCR denitrification of MnOx/Al2O3 modified by CeO2 and its mechanism at low temperature [J].Environmental Science，2011，32(8):2240-2246
    [9] CORMA A, MARTIN G N, VENNESTROM P, et al.Fe-containing zeolites for NH3-SCR of NOx: Effect of structure, synthesis procedure and chemical composition on catalytic performance and stability[J].Chemistry，2017，23(54):13404-13404 10.1002/chem.201701742
    [10] 潘伶，杨沛山，曹友洪.SCR脱硝反应器烟道内部流场的数值模拟与优化[J].环境工程学报，2015，9(6):2918-2924
    [11] 周英贵，金保昇.基于非均匀入口条件SCR系统气固相组分的分布特性优化[J].环境工程学报，2017，11(1):421-426 10.12030/j.cjee.201508193
    [12] PARK N S, YOON S, JEONG W, et al.Improving flow distribution in influent channels using computational fluid dynamics[J].Water Science & Technology，2016，74(8):1855-1866 10.2166/wst.2016.358
    [13] SMITS W, DERIDDER S, DESMET G.The impact of flow distribution on column performance: A computational fluid dynamics study[J].Journal of Chromatography A，2014，1369:125-130 10.1016/j.chroma.2014.10.024
    [14] PAWELEC A, DOBROWOLSKI A.Analysis of mixing conditions and multistage irradiation impact on NOx removal efficiency in the electron beam flue gas treatment process[J].Environmental Technology，2017，38(1):128-139 10.1080/09593330.2016.1188160
    [15] 秦锋，黄辉，马政宇.燃煤发电超低排放技术及其潜在影响分析[J].煤气与热力，2015，35(2):49-53
  • 加载中
WeChat 点击查看大图
计量
  • 文章访问数:  3391
  • HTML全文浏览数:  3073
  • PDF下载数:  399
  • 施引文献:  0
出版历程
  • 刊出日期:  2018-04-22

基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造

  • 1. 大唐东北电力试验研究所有限公司，长春130012
基金项目:

摘要: 以东北地区某350 MW火电机组为研究对象，对其超低排放改造后的脱硝系统择性催化还原(selective catalytic reduction，SCR)反应器进行性能测试，利用所获数据绘制等高线图和折线图，研究并分析了SCR反应器出、入口烟气流场和NOx浓度场的分布特性。结果显示，脱硝系统平均效率为97.37%，SCR反应器出口NOx平均浓度为13.31 mg·m-3，均达设计要求（脱硝效率≥91.1%，出口浓度≤40 mg·m-3），总体脱硝性能表现良好。结果表明：入口NOx均匀度较好；甲、乙侧反应器出口烟道NOx浓度的离散度分别为31.49%、56.90%，高于设计值（≤15%），出口NOx分布不均匀。技术改造使得该机组SCR反应器出口NOx浓度满足了超低排放限值的要求（≤50 mg·m-3），却在喷氨优化调整、喷氨格栅清理以及催化剂压差控制等方面存在不足。在增加新催化剂层的基础上，对于催化剂层结构疏通、喷氨自动控制、烟气流场的校核与改造等方面仍有提升的空间。

English Abstract

参考文献 (15)

目录

/

返回文章
返回

Copyright © 2019 中国科学院生态环境研究中心