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. DOI: 10.11930/j.issn.1004-9649.201701050
引用本文: 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. DOI: 10.11930/j.issn.1004-9649.201701050
Zhaojun FANG, Chengzheng LU, Xiaolong BAI. Study on Operation Optimization of SCR Denitrification with Ammonia-Injection for Ultra-Low Emission[J]. Electric Power, 2018, 51(2): 143-148. DOI: 10.11930/j.issn.1004-9649.201701050
Citation: Zhaojun FANG, Chengzheng LU, Xiaolong BAI. Study on Operation Optimization of SCR Denitrification with Ammonia-Injection for Ultra-Low Emission[J]. Electric Power, 2018, 51(2): 143-148. DOI: 10.11930/j.issn.1004-9649.201701050

SCR脱硝系统超低排放运行优化技术研究

Study on Operation Optimization of SCR Denitrification with Ammonia-Injection for Ultra-Low Emission

  • 摘要: 为提高燃煤电厂NOx超低排放改造后的运行水平,以增加了1层备用催化剂的某台600 MW机组为例,实测了超低排放改造后脱硝反应器出口NOx浓度分布、脱硝反应器出口与脱硫塔出口NOx浓度偏差以及逃逸氨浓度。对所存在的问题进行了优化调整和处置,包括喷氨优化调整,疏通堵塞的氨支管喷嘴。该机组通过低氮燃烧改造,进一步降低了脱硝装置入口NOx浓度,为避免过量喷氨造成后续不良影响,提出应适当降低脱硝效率,即以NOx达标排放为基准,控制喷氨量。对该机组催化剂活性进行评估,给出了催化剂更换、加装或者再生策略选择的约束性指标。

     

    Abstract: A 600 MW coal-fired unit with one more layer of backup catalyst is taken as an example in this paper to measure the NOx concentration distribution at the SCR reactor outlet, the NOx concentration deviation between the outlets of the SCR reactor and the FGD tower, and the concentration of ammonia slip, for the purpose of improving the operation quality of the thermal power plant after the ultra-low emission technical transformation. Some problems, such as the ammonia injection optimization and blocked ammonia branch nozzle dredging, are resolved and the corresponding adjustment is applied. The low NOx burner reformation decreases the NOx concentration at the SCR inlet. To avoid adverse effects due to excessive ammonia injection, it is suggested that the denitrification efficiency should be lowered accordingly, i.e. to control the ammonia injection to a certain level based on the NOx emission standard. The catalyst activity of the unit is evaluated, and the constraint indexes of catalyst replacement, installation or regeneration strategy selection are proposed.

     

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