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山东大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (4): 70-76.doi: 10.6040/j.issn.1672-3961.0.2017.047

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Urea-SCR系统尿素结晶现象分析及解决方案

白凤月,温邦耀,白书战*   

  1. 山东大学能源与动力工程学院, 山东 济南 250061
  • 收稿日期:2017-02-08 出版日期:2017-08-20 发布日期:2017-02-08
  • 通讯作者: 白书战(1979— ),男,山东聊城人,副教授,博士,主要研究方向为柴油机燃烧及排放控制技术. E-mail:baishuzhan@sdu.edu.cn E-mail:1204169515@qq.com
  • 作者简介:白凤月(1993— ),男,河北沧州人,硕士研究生,主要研究方向为内燃机排放控制及结构优化. E-mail:1204169515@qq.com
  • 基金资助:
    国家重点研发计划资助项目(2016YFD700705-01);山东省重点研发资助项目(2015GSF117013);山东省农机装备研发创新计划资助项目(2016YF003)

Analysis and optimization of urea deposits formation in urea-SCR systems

BAI Fengyue, WEN Bangyao, BAI Shuzhan*   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2017-02-08 Online:2017-08-20 Published:2017-02-08

摘要: 通过利用热重-红外联用(thermo-gravimeter-fourier transform infrared spectroscopy, TG-FTIR)技术检测尿素沉积物成分及利用计算流体动力学(computational fluid dynamics, CFD)技术模拟排气系统中气流运动,分析尿素选择性催化还原(urea selective catalytic reduction, urea-SCR)系统中的尿素结晶现象。针对尿素喷雾碰壁问题及雾化不良问题,根据CFD仿真结果提出一体式喷嘴座结构和集成式喷嘴座封装结构,然后利用柴油机台架试验优化尿素启喷温度和喷射速率。试验结果表明:当尿素启喷温度为272 ℃或喷射速率为5 g/min时,两种优化结构中均无尿素沉积物生成,解决尿素结晶结石问题,为柴油机SCR系统优化设计提供依据。

关键词: 尿素选择性催化还原系统, 尿素沉积, 尿素喷射策略, 柴油机, 结构优化

Abstract: Urea crystallization in the urea selective catalytic reduction(urea-SCR)system was analyzed by detecting the components of the deposits with thermo-gravimeter-fourier transform infrared spectroscopy(TG-FTIR)technology and simulating the air motion in the exhaust system with computational fluid dynamics(CFD)technology. To solve the problem of urea solution hitting the wall and poor atomization, the integral nozzle mountings structure and integrated nozzle seat package structure were put forward based on the CFD results, and the exhaust temperature when it started to spray and the injection rate of urea solution were optimized with engine bench tests. The results indicated that there were no urea deposits in the optimized structures when the exhaust temperature reached 272 ℃ or the injection rate of urea solution reached 5 g/min, thus solved the urea crystallization problem, which could provide effective methods for design and optimization of SCR systems for diesel engines.

Key words: urea deposition, urea-SCR system, urea injection strategy, diesel engine, structural optimization

中图分类号: 

  • TK421.5
[1] JOHNSON T V. Review of diesel emissions and control[J]. SAE International Journal of Fuels and Lubricants, 2010, 3(1):16-29.
[2] 黄锦成, 沈捷. 车用内燃机排放与污染控制[M]. 北京:科学出版社, 2012. HUANG Jincheng, SHEN Jie. Vehicle exhaust emission and pollution control[M]. Beijing:Science Press, 2012.
[3] 陶建忠. 利用选择催化还原反应(SCR)降低车用柴油机氮氧化物的技术研究[D]. 济南:山东大学, 2008. TAO Jianzhong. Study on DeNOx technology by selective catalytic reduction(SCR)for heavy-duty diesel engines[D]. Jinan: Shandong University, 2008.
[4] 赵彦光. 柴油机SCR技术尿素喷雾热分解及氨储存特性的试验研究[D]. 北京:清华大学, 2012. ZHAO Yanguang. Experimental study of urea solution spray and decomposition and ammonia storage in selective catalytic reduction system for diesel engines[D]. Beijing: Tsinghua University, 2012.
[5] 酒建刚, 刘西文, 雷军, 等. 非道路柴油机NOx排放控制措施[J]. 拖拉机与农用运输车, 2016, 43(3):7-9. JIU Jiangang, LIU Xiwen, LEI Jun, et al. NOx emission control measures for non-road diesel engine[J]. Tractor & Farm Transporter, 2016, 43(3):7-9.
[6] 高子朋, 吴桂涛, 李超. 基于AVL BOOST 的船舶柴油机SCR催化剂储氨特性仿真[J]. 大连海事大学学报, 2016, 42(2):68-74. GAO Zipeng, WU Guitao, LI Chao. Ammonia storage characteristics simulation of SCR catalyst for marine diesel engine based on AVL BOOST[J]. Journal of Dalian Maritime University, 2016, 42(2):68-74.
[7] STROTS V O, SANTHANAM S, ADELMAN B J, et al. Deposit formation in urea-SCR systems[J]. SAE International Journal of Fuels and Lubricants, 2009, 2(1):283-289.
[8] HIRATA K, MASAKI N, UENO H, et al. Development of urea-SCR system for heavy-duty commercial vehicles[R]. New York, USA: SAE International, 2005.
[9] CHATTERJEE D, BURKHARDT T, BANDL-KONRAD B, et al. Numerical simulation of ammonia SCR-catalytic converters: model development and application[R]. New York, USA: SAE International, 2005.
[10] 冯向宇, 葛蕴珊, 马朝臣, 等. 柴油机尿素SCR催化剂储氨特性与氨泄漏影响因素的试验研究[J]. 内燃机工程, 2016, 37(3):78-82. FENG Xiangyu, GE Yunshan, MA Chaochen, et al. Experimental study on ammonia storage characteristics and factors affecting the ammonia slip of diesel engine urea SCR[J]. Chinese Internal Combustion Engine Engineering, 2016, 37(3):78-82.
[11] 陈悦, 吕林. 船用柴油机SCR系统混合器仿真与试验研究[J]. 哈尔滨工程大学学报, 2016, 37(1):24-29. CHEN Yue, LYU Lin. Numerical simulation and experimental study of static mixers for a marine SCR system[J]. Journal of Harbin Engineering University, 2016, 37(1):24-29.
[12] 干旭波, 姚栋伟, 吴锋, 等. 柴油机SCR系统气液两相流准一维数值模拟[J]. 内燃机学报, 2015, 33(6):537-542. GAN Xubo, YAO Dongwei, WU Feng, et al. Quasi one-dimensional numerical simulation of gas-liquid two phase flow in SCR system of diesel engine[J]. Transactions of CSICE, 2015, 33(6):537-542.
[13] 高俊华,邝坚,宋崇林,等. 国Ⅳ柴油机SCR后处理系统结晶体成分分析[J].燃烧科学与技术, 2010, 16(6):547-552. GAO Junhua, KUANG Jian, SONG Chonglin, et al. Components of crystal from SCR system of a diesel engine compliant with China stage IV emission standard[J]. Journal of Combustion Science and Technology, 2010, 16(6):547-552.
[14] XU L, WATKINS W, SNOW R, et al. Laboratory and engine study of urea-related deposits in diesel urea-SCR after-treatment systems[R]. New York, USA: SAE International, 2007.
[15] ZHENG G, FILA A, KOTRBA A, et al. Investigation of urea deposits in urea SCR systems for medium and heavy duty trucks[R]. New York, USA: SAE International, 2010.
[16] SALANTA G, ZHENG G, KOTRBA A, et al. Optimization of a urea SCR system for on-highway truck applications[R]. New York, USA: SAE International, 2010.
[17] 张纪元,李国祥,孙少军, 等. 重型柴油机Urea-SCR系统尿素沉积物的试验研究[J]. 车用发动机, 2015, 201(4):43-47. ZHANG Jiyuan, LI Guoxiang, SUN Shaojun, et al. Experimental study on urea deposits of urea-SCR system for heavy duty diesel engines[J]. Vehicle Engine, 2015, 201(4):43-47.
[18] SCHABER P M, COLSON J, HIGGINS S, et al. Thermal decompisiton(Pyrolysis)of urea in an open reaction vessel[J]. Thermochimica Acta, 2004, 424(1-2):131-142.
[19] 刘传宝,颜伏伍,朱清山,等. 柴油机SCR开环控制系统尿素计量脉谱标定方法[J].农业机械学报, 2012, 43(5):16-21. LIU Chuanbao, YAN Fuwu, ZHU Qingshan, et al. Urea dosing map calibration method of open loop control system of diesel engine SCR[J]. Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(5):16-21.
[20] 马彦军, 李君, 曲大为, 等. 柴油机SCR系统尿素分解效率研究[J]. 农业机械学报. 2015, 46(6):282-286. MA Yanjun, LI Jun, QU Dawei, et al. Urea decomposition efficiency of diesel engine SCR system[J]. Transactions of the Chinese Society for Agricultural Machinery, 2015, 46(6):282-286.
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