李曈^1,
1.大唐东北电力试验研究所有限公司，长春130012

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

LI Tong^1,
1.Datang Northeast Electric Power Test & Research Institute, Changchun 130012，China

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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。
关键词: 选择性催化还原/
超低排放改造/
氮氧化物/
离散度/
浓度场/
流场分布

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.
Key words:selective catalytic reduction/
ultra-low emission reconstruction/
NOx/
dispersion/
concentration field/
flow distribution.

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刊出日期:2018-04-22

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基于SCR反应器NOx均匀度测试的脱硝系统超低排放改造

李曈^1,
1.大唐东北电力试验研究所有限公司，长春130012
基金项目:
关键词: 选择性催化还原/
超低排放改造/
氮氧化物/
离散度/
浓度场/
流场分布
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。

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