选择性非催化还原脱硝技术 (SNCR) 在W型火焰锅炉的应用
大唐阳城发电有限责任公司, 山西阳城 048012
| 摘 要： | 介绍了某电火厂非催化还原脱硝技术（SNCR）工程应用情况，详细介绍了该火电厂主要设备型式和关键技术参数、设计煤质情况。进一步阐述了火电机组氮氧化物超低排放的改造背景、SNCR系统设计的关键指标，包括：SNCR系统出、入口NOx浓度和脱硝效率，SNCR系统对锅炉运行效率的影响预测值，系统氨逃逸的设计值和装置使用年限。同时对该非催化还原（SNCR）脱硝技术工程的工艺流程和主要设备系统进行了详细描述：包括尿素溶液制备系统，尿素溶液存储输送系统，尿素溶液的混合分配系统，尿素溶液喷射系统以及配套的热工测量控制系统和电气系统。通过SNCR装置的实际运行参数控制和运行效果，说明了该火电厂SNCR系统改造达到了预期目的，实现了机组的氮氧化物稳定超低排放，为同类型机组的脱硝改造提供了一条新的可借鉴的技术路线。 |
| 关 键 词： | SNCR脱硝技术; 工艺流程; 设备规范; 运行效果 |
| DOI： | 10.57237/j.wjese.2024.03.001 |
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收稿日期: 2024-05-08
接受日期: 2024-06-11
在线出版日期: 2024-06-18
Application of Selective Non Catalytic Reduction (SNCR) Denitration Technology in W-flame Boiler
Datang Yangcheng Power Generation Co., Ltd., Yangcheng 048012, China
| Abstract: | This article introduces the engineering application of non catalytic reduction (SNCR) denitrification technology in a certain thermal power plant, and provides a detailed introduction to the main equipment types, key technical parameters, and design coal quality of the thermal power plant. Further elaborated on the background of the transformation of ultra-low nitrogen oxide emissions in thermal power units, key indicators of SNCR system design, including: NOx concentration and denitrification efficiency at the inlet and outlet of SNCR system, predicted impact of SNCR system on boiler operation efficiency, design value of ammonia escape in the system, and service life of the device. At the same time, a detailed description was given of the process flow and main equipment systems of the non catalytic reduction (SNCR) denitrification technology project, including urea solution preparation system, urea solution storage and transportation system, urea solution mixing and distribution system, urea solution injection system, as well as supporting thermal measurement control system and electrical system. Through the control of actual operating parameters and operational effects of the SNCR device, it is demonstrated that the SNCR system renovation of the thermal power plant has achieved the expected goals, achieving stable ultra-low emissions of nitrogen oxides in the unit, and providing a new technical route that can be referenced for the denitrification renovation of similar units. |
| Keywords: | SNCR Denitrification Technology; PROCESS Flow; Equipment Specifications; Running Effect |
参考文献
| [1] | 朱传强, 胡利华, 沈宏伟, 等. 生活垃圾焚烧选择性非催化还原 (SNCR) 的工程试验研究 [J]. 工程热物理学报, 2020, 41(8): 2089-2095. |
| [2] | 刘凤, 李昊天, 张彩端, 等. 基于吸收剂分区的同时脱硫脱硝反应特性研究 [J]. 动力工程学报, 2019, 39(12): 994-998, 1004. |
| [3] | 杨希刚, 陈国庆, 黄林滨, 等. 尿素法SNCR对大型电站煤粉锅炉运行影响的工业试验 [J]. 化工进展, 2022, 41(7): 3573-3581. |
| [4] | GHOLAMI F, TOMAS M, GHOLAMI Z, et al. Technologies for the nitrogen oxides reduction from flue gas: A review [J]. Science of the Total Environment, 2020, 714: 136712. |
| [5] | 罗晨, 马素霞, 崔志刚, 等. 基于碳酸氢铵的SNCR低温脱硝实验研究 [J]. 热能动力工程, 2022, 37(8): 128-134, 142. |
| [6] | PARK P M, PARK Y K, DONG J I. Reaction characteristics of NOx and N2O in selective non-catalytic reduction using various reducing agents and additives [J]. Atmosphere, 2021, 12(9): 1175. |
| [7] | 陆续, 吴庆龙, 张向宇, 等. 高温还原区喷氨脱硝试验研究[J]. 动力工程学报, 2020, 40(6): 481-485, 501. |
| [8] | 王菁, 张瑞娉, 杨凤玲, 等. 水蒸气在NOx控制技术中机理研究及应用进展 [J]. 洁净煤技术, 2021, 27(5): 89-97. |
| [9] | 汪宝宝, 池作和, 王进卿, 等. 雾化喷枪参数对流化床锅炉 SNCR 脱硝效率的影响 [J]. 热力发电, 2015, 44(5): 45-49. |
| [10] | 李穹, 吴玉新, 杨海瑞, 等. SNCR 脱硝特性的模拟及 优化 [J]. 化工学报, 2013, 64(5): 1789-1796. |
| [11] | 唐志雄, 曾环木, 岑超本, 等. NH3选择性非催化还原含硫烟气中 NOx 的实验研究 [J]. 中国电机工程学报, 2013, 33(20): 34-39. |
| [12] | 屈卫东, 周建强, 杨建华, 等. 循环流化床锅炉 SNCR 脱硝系统优化及应用 [J]. 热力发电, 2014, 43(1): 133-136. |
| [13] | 高阳, 赵博, 禚玉群, 等. 中温条件下粉煤灰对氨气脱 硝性能的影响 [J]. 清华大学学报(自然科学版), 2011, 51(5): 668-671. |
| [14] | 张彦文, 蔡宁生, 李振山. 加入CH4促进 SNCR 过程的计算与机理分析 [J]. 热力发电, 2005, 34(12): 9-12. |
| [15] | 郝江涛, 于伟, 卢平, 等. 烟气组分和添加剂对选择性 非催化还原脱硝特性的影响 [J]. 中国电机工程学报, 2015, 35(12): 3054-3060. |
| [16] | 段传和, 夏怀祥, 谭效德, 等. 选择性非催化还原法 (SNCR) 烟气脱硝 [M]. 北京: 中国电力出版社, 2012: 37. |
| [17] | 罗朝晖, 王恩禄. 循环流化床锅炉选择性非催化还原技术及其脱硝系统的研究 [J]. 动力工程, 2008, 28(3): 442-446. |
