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[1]范鲁艳,汪安东,曲大为,等.重型柴油机固态铵选择性催化还原系统铵盐热解及动力学特征研究[J].西安交通大学学报,2017,51(09):44-53.[doi:10.7652/xjtuxb201709007]
 FAN Luyan,WANG Andong,QU Dawei,et al.Pyrolysis and Kinetic Characteristics of Ammonium Salt in SolidState Ammonium SCR System for Heavy Duty Diesel Engine[J].Journal of Xi'an Jiaotong University,2017,51(09):44-53.[doi:10.7652/xjtuxb201709007]
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重型柴油机固态铵选择性催化还原系统
铵盐热解及动力学特征研究
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《西安交通大学学报》[ISSN:0253-987X/CN:61-1069/T]

卷:
51
期数:
2017年第09期
页码:
44-53
栏目:
出版日期:
2017-09-10

文章信息/Info

Title:
Pyrolysis and Kinetic Characteristics of Ammonium Salt in
SolidState Ammonium SCR System for Heavy Duty Diesel Engine
作者:
范鲁艳汪安东曲大为马军彦
吉林大学汽车仿真与控制国家重点实验室,130022,长春
Author(s):
FAN LuyanWANG AndongQU DaweiMA Junyan
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
关键词:
固态铵选择性催化还原铵盐热解特性动力学参数
Keywords:
solidstate ammonium selective catalytic reduction ammonium salt
pyrolysis characteristics
kinetic parameter
分类号:
TK41
DOI:
10.7652/xjtuxb201709007
摘要:
通过开展选择性催化还原(SCR)系统中铵盐的热解及动力学特征研究,为固态铵SCR氨气生成及氨气供给系统的设计提供理论依据及技术支撑,采用热重实验和分解平衡压实验分析了3种铵盐的分解温度、分解速率等热解特性,利用等温法和积分法计算了氨基甲酸铵和碳酸铵的分解动力学参数。碳酸铵和氨基甲酸铵的受热分解就是在恒定温度下测定其剩余质量比与受热时间的关系,再在热重分析曲线中通过反应时间下的剩余质量比求得速率常数和反应级数。研究结果表明:氨基甲酸铵分解速率大于碳酸铵和碳酸氢铵;氨基甲酸铵分解反应级数为1/2,碳酸铵的为2/3,氨基甲酸铵活化能为56 kJ/mol,碳酸铵的为62 kJ/mol;氨基甲酸铵和碳酸铵均适合作为固态铵选择性催化还原(SSCR)系统还原剂的来源,氨基甲酸铵优势更明显。相比尿素SCR技术,固态铵SCR技术在发动机低排气温度条件下能够提供足量的还原剂,有效提高低温NOx转化效率。
Abstract:
The pyrolysis and kinetic characteristics of ammonium salts in solid ammonium selective catalytic reduction (SCR) system are investigated to provide theoretical and technical supports for design of solid ammonia SCR gaseous ammonia production and supply system. The pyrolysis characteristics of three kinds of ammonium salts, including decomposition temperatures and rates, are analyzed by thermogravimetric test and decomposition equilibrium pressure test, and the decomposition kinetics parameters of ammonium carbamate and ammonium carbonate are calculated with isothermal method and integral method. The thermal decomposition of ammonium carbonate and ammonium carbamate are completed at constant temperature to determine the relationship between the residual mass ratio and the heating time, and the rate constants and reaction orders are obtained by the mass ratio versus reaction time in thermogravimetric analysis curves. The results show that the decomposition rate of ammonium carbamate gets higher than that of ammonium carbonate and ammonium bicarbonate; the reaction order of ammonium carbamate is 1/2, and that of ammonium carbonate is 2/3; the activation energy of ammonium carbamate and ammonium carbonate reaches respectively 56 kJ/mol and 62 kJ/mol; ammonium carbamate and ammonium carbonate are suitable to be the source of the reducing agent of SSCR system, and the advantage of ammonium carbamate is more obvious. Compared with urea SCR technology, solidstate ammonium SCR technology can provide more sufficient amount of reducing agent when the engine is at low exhaust temperature, so that the conversion efficiency of lowtemperature NOx is effectively improved.

参考文献/References:

[1]龚金科. 汽车排放及控制技术 [M]. 北京: 人民交通出版社, 2012: 69
[2]周庆辉. 现代汽车排放控制技术 [M]. 北京: 北京大学出报社, 2010: 5659.
[3]陶建忠. 利用选择性催化还原反应(SCR)降低车用柴油机氮氧化物的研究 [D]. 济南: 山东大学, 2008: 2023.
[4]楼狄明, 张正兴, 谭丕强, 等. 后处理技术降低柴油机NOx排放的研究进展 [J]. 小型内燃机与摩托车, 2010, 39(2): 7074.
LOU Diming, ZHANG Zhengxing, TAN Piqiang, et al. The postprocessing technology to reduce NOx emissions of diesel engine research progress [J]. Journal of Small Internal Combustion Engine and Motorcycle, 2010, 39(2): 7074.
[5]LITSUKA Y, YAMAUCHI H, SATO S, et al. Ammonia production from solid urea using nonthermal plasma [J]. IEEE Transactions on Industry Applications, 2012, 48(3): 872877.
[6]高继东, 秦孔建, 梁荣亮, 等. 实际道路工况和法规工况下中型柴油机排放特性的对比分析 [J]. 吉林大学学报(工学版), 2012, 42(1): 3338.
GAO Jidong, QIN Kongjian, LIANG Rongliang, et al. The actual road conditions and characteristics of the medium under the condition of diesel engine emission from comparative analysis [J]. Journal of Jilin University (Engineering Science), 2012, 42(1): 3338.
[7]楼狄明, 张正兴, 谭丕强, 等. 车用柴油机选择性催化还原技术研究进展 [J]. 环境科学与技术, 2009, 32(12): 103108.
LOU Diming, ZHANG Zhengxing, TAN Piqiang, et al. Automotive diesel engine selective catalytic reduction technology research progress [J]. Journal of Environmental Science and Technology, 2009, 32(12): 103108.
[8]JOHNSON T V. Review of diesel emissions and control: SAE 2010010301 [R]. Washington, DC, USA: SAE, 2010.
[9]LACIN F, KOTRBA A, HAYWORTH G, et al. SOLIDSCR: demonstrating an improved approach to NOx reduction via a solid reductant: SAE 2011012207 [R]. Washington, DC, USA: SAE, 2011.
[10]JOHANNESSEN T, SCHIMIDT H, FREY A M, et al. Improved automotive NOx after treatment system: metal ammine complexes as NH3 source for SCR using Fecontaining zeolite catalysts [J]. Catalysis Letters, 2009, 128(1/2): 94100.
[11]刘东旭. 碳酸氢铵作为脱硝还原剂的试验研究与数值模拟 [D]. 石家庄: 华北电力大学: 2009: 712.
[12]钱晓农. 碳酸氢铵热分解动力学研究 [J]. 云南化工, 1994, 21(1): 2022.
QIAN Xiaonong. Study on the kinetics of thermal decomposition of ammonium bicarbonate [J]. Journal of Chemical Industry in Yunnan Province, 1994, 21(1): 2022.
[13]邹文樵, 冯仰婕. DSC研究碳铵分解动力学与各因素统计分析 [J]. 华东化工学院学报, 1990, 16(3): 303308.
ZOU Wenqiao, FENG Yangjie. Study of decomposition kinetics of NH4HCO3 by DSC and statistical analysis for each factor [J]. Journal of East China Institute of Chenmical Technology, 1990, 16(3): 303308.
[14]张克立, 张友祥, 马晓玲. 固体无机化学 [M]. 武汉: 武汉大学出版社, 2012: 297300.
[15]胡荣祖, 高胜利, 赵凤起, 等. 热分析动力学 [M]. 2版. 北京: 科学出版社, 2008: 101103.
[16]张延安, 豆志河. 宏观动力学研究方法 [M]. 北京: 化学工业出版社, 2014: 9598.
[17]左金琼. 热分析汇中活化能的求解与分析 [D]. 南京: 南京理工大学, 2006: 1821.
[18]唐万军. 温度积分及固体分解反应的热分析动力学研究 [D]. 武汉: 武汉大学, 2004: 3033.
[19]刘艳华. 多步骤固相分解反应的热分析动力学研究 [D]. 长春: 吉林大学, 2005: 910.

备注/Memo

备注/Memo:
国家自然科学基金资助项目(51306070)
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