基于PSR的非绝热MILD燃烧研究
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摘要
本文研究了基于全混流反应器(PSR)模型的非绝热MILD燃烧的特征和形成条件。通过理论研究,本文将PSR绝热燃烧的S形曲线理论推广到非绝热的工况下,并给出了非绝热MILD燃烧的数学判据。研究表明,随着散热速率的增加,形成MILD燃烧所需的入口温度降低,燃烧后的温升减小。综合考察燃烧过程有无明显火焰锋面和燃烧前后的温升,在本文考察的范围内,散热有利于MILD燃烧的实现和保持,反之吸热不利于MILD燃烧的实现和保持。
The characteristics and establishment conditions of a non-adiabatic MILD combustion in a perfectly stirred reactor(PSR) were studied using theoretical analysis and modeling. The S-shaped curve theory of adiabatic PSR combustion was extended to non-adiabatic PSR combustion conditions,and the mathematical criteria for the establishment of non-adiabatic MILD combustion was provided in the present study. Results demonstrated that MILD combustion can be established with lower inlet temperature and the decreased temperature increase with respect to the inlet temperature as heat loss rate increased. Considering both the flameless nature of a MILD combustion and the maximum allowable temperature increase, heat loss favored, while heat gain is not conducive to, the establishment and maintenance of a MILD combustion process.
The characteristics and establishment conditions of a non-adiabatic MILD combustion in a perfectly stirred reactor(PSR) were studied using theoretical analysis and modeling. The S-shaped curve theory of adiabatic PSR combustion was extended to non-adiabatic PSR combustion conditions,and the mathematical criteria for the establishment of non-adiabatic MILD combustion was provided in the present study. Results demonstrated that MILD combustion can be established with lower inlet temperature and the decreased temperature increase with respect to the inlet temperature as heat loss rate increased. Considering both the flameless nature of a MILD combustion and the maximum allowable temperature increase, heat loss favored, while heat gain is not conducive to, the establishment and maintenance of a MILD combustion process.
引文
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[2] Tsuji H, Gupta A, Hasegawa T. High Temperature Air Combustion:From Energy Conservation to Pollution Reduction[M]. CRC Press, 2003
[3] Zhang H, Yue G, Lu J, et al. Development of High Temperature Air Combustion Technology in Pulverized Fossil Fuel Fired Boilers[J]. Proceedings of the Combustion Institute, 2007, 31(2):2779-2785
[4] Li P, Mi J, Dally B, et al. Progress and Recent Trend In Mild Combustion[J]. Science China Technological Sciences, 2011, 54(2):255-269
[5] Noor M M, Wandel A P,Yusaf T. A Review of Mild Combustion and Open Furnaci Design Consideratioa[J]. International Journal of Automotive and Mechanical Engineering, 2012, 6:730-754
[6] Wang F, Li P, Mei Z, et al. Combustion of CH_4/O_2/N_2in a Well Stirred Reactor[J]. Energy, 2014, 72:242-253
[7] Li P, Dally B B, Mi J, et al. Mild Oxy-Combustion of Gaseous Fuels in a Lab oratory-Scale Furnace[J]. Combustion and Flame, 2013, 160(5):933-946
[8] Evans M J, Med well P R, Wu H, et al. Classification and Lift-Off Height Prediction of Non-Premixed Mild and Autoignitive Flames[J]. Proceedings of the Combustion Institute, 2017, 36(3):4297-4304
[9] Wang F, Mi J, Li P. Combustion Regimes of a Jet Diffusion Flame in Hot Co-Flow[J]. Energy&Fuels, 2013,27(6):3488-3498
[10] W(u|¨)nning J A, Wiinning J G. Flameless Oxidation to Reduce Thermal No-Formation[J]. Progress in Energy and Combustion Science, 1997, 23(1):81-94
[11] Oberlack M, Arlitt R, Peters N. On Stochastic Damk(o|¨)hler Number Variations in a Homogeneou, Flow Reactor[J]. Combustion Theory and Modelling, 2000,4(4):495-509
[12]王飞飞,米建春,李鹏飞.炉壁散热率和烟气循环率对预混燃烧的影响[J].中国电机工程学报,2011, 31(14):44-49WANG Feifei, Mr Jianchun, LI Pengfei. Effect of Heat Extraction and the Exhaust Gas Recirculation Rate on the Premixed Combustion[J]. Proceedings of The Chinese Society for Electrical Engineering, 2011, 31(14):44-49
[2] Tsuji H, Gupta A, Hasegawa T. High Temperature Air Combustion:From Energy Conservation to Pollution Reduction[M]. CRC Press, 2003
[3] Zhang H, Yue G, Lu J, et al. Development of High Temperature Air Combustion Technology in Pulverized Fossil Fuel Fired Boilers[J]. Proceedings of the Combustion Institute, 2007, 31(2):2779-2785
[4] Li P, Mi J, Dally B, et al. Progress and Recent Trend In Mild Combustion[J]. Science China Technological Sciences, 2011, 54(2):255-269
[5] Noor M M, Wandel A P,Yusaf T. A Review of Mild Combustion and Open Furnaci Design Consideratioa[J]. International Journal of Automotive and Mechanical Engineering, 2012, 6:730-754
[6] Wang F, Li P, Mei Z, et al. Combustion of CH_4/O_2/N_2in a Well Stirred Reactor[J]. Energy, 2014, 72:242-253
[7] Li P, Dally B B, Mi J, et al. Mild Oxy-Combustion of Gaseous Fuels in a Lab oratory-Scale Furnace[J]. Combustion and Flame, 2013, 160(5):933-946
[8] Evans M J, Med well P R, Wu H, et al. Classification and Lift-Off Height Prediction of Non-Premixed Mild and Autoignitive Flames[J]. Proceedings of the Combustion Institute, 2017, 36(3):4297-4304
[9] Wang F, Mi J, Li P. Combustion Regimes of a Jet Diffusion Flame in Hot Co-Flow[J]. Energy&Fuels, 2013,27(6):3488-3498
[10] W(u|¨)nning J A, Wiinning J G. Flameless Oxidation to Reduce Thermal No-Formation[J]. Progress in Energy and Combustion Science, 1997, 23(1):81-94
[11] Oberlack M, Arlitt R, Peters N. On Stochastic Damk(o|¨)hler Number Variations in a Homogeneou, Flow Reactor[J]. Combustion Theory and Modelling, 2000,4(4):495-509
[12]王飞飞,米建春,李鹏飞.炉壁散热率和烟气循环率对预混燃烧的影响[J].中国电机工程学报,2011, 31(14):44-49WANG Feifei, Mr Jianchun, LI Pengfei. Effect of Heat Extraction and the Exhaust Gas Recirculation Rate on the Premixed Combustion[J]. Proceedings of The Chinese Society for Electrical Engineering, 2011, 31(14):44-49