| 船舶柴油机Urea-SCR系统催化反应动力学分析 |
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| 引用本文： | 朱元清,周松,刘淼,王金玉.船舶柴油机Urea-SCR系统催化反应动力学分析[J].江苏大学学报(自然科学版),2012,33(1):34-38. |
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| 作者姓名： | 朱元清 周松 刘淼 王金玉 |
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| 作者单位： | 1. 哈尔滨工程大学 动力与能源工程学院,黑龙江哈尔滨,150001
2. 潍柴动力股份有限公司 应用工程部,山东潍坊,261041 |
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| 摘 要： | 针对Urea-SCR系统的工作特点,利用计算流体动力学耦合化学反应动力学的方法,对某型船舶柴油机Urea-SCR系统的高负荷性能进行了计算,得到了脱硝率(DeNOx率)、NH3逃逸率和尿素消耗量的关系,探讨了快速SCR反应对脱硝率和NH3逃逸率的影响,分析了催化过程中各组分质量分数的空间分布.结果表明:假定尿素溶液均匀混合在废气中,当(NH2)2CO与NOx摩尔比为0.475时,即NH3与NOx摩尔比为0.95,脱硝率和NH3逃逸率的匹配最佳,且脱硝率的计算值与试验值的误差保持在5%以内;高负荷时,快速SCR反应可使系统脱硝率进一步提高,并可以明显降低系统NH3逃逸率,避免造成二次污染.
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| 关 键 词： | 船舶柴油机 Urea-SCR系统 脱硝率 NH3逃逸率 催化过程 |
Kinetics analysis of catalytic processes for marine diesel Urea-SCR system |
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| Zhu Yuanqing
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Zhou Song
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Liu Miao
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Wang Jinyu.Kinetics analysis of catalytic processes for marine diesel Urea-SCR system[J].Journal of Jiangsu University:Natural Science Edition,2012,33(1):34-38. |
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| Authors: | Zhu Yuanqing Zhou Song Liu Miao Wang Jinyu |
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| Institution: | 1.College of Power & Energy Engineering,Harbin Engineering University,Harbin,Heilongjiang 150001,China;2.Application Engineering Department,Weichai Power Company Limited,Weifang,Shandong 261041,China) |
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| Abstract: | According to the characteristics of Urea-SCR system,kinetics analysis of catalytic processes for marine diesel Urea-SCR system was carried out by computational fluid dynamics(CFD) coupled with chemical reaction kinetics.Based on 3-dimensional transient model,DeNOx rates and NH3-slips under different urea solution consumption rates,effects of fast SCR reaction on the catalytic processes and distributions of different specie concentrations were discussed.The results show that high DeNOx rate and low NH3-slip are obtained at optimal(NH2)2CO/NOx ratio of 0.475 for high load of marine diesel.The experimental DeNOx rate is consistent with calculated value with error less than 5%.DeNOx rate at high load can be further enhanced by increasing NO2/NO ratio to 1 ∶1 with obvious decrease of NH3-slip. |
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| Keywords: | marine diesel Urea-SCR system DeNOx rate NH3-slip catalytic processes |
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