دانلود رایگان مقاله لاتین ویژگی شعله اکسی از سایت الزویر
عنوان فارسی مقاله:
مطالعه عددی ویژگی های شعله اکسی در مشعلی با سه جت جدا
عنوان انگلیسی مقاله:
Numerical study of oxy-flame characteristics in a burner with three separated jets
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
The evolution of pollution standards associated to strict regulations which motivate the fall of fuel consumption, lead to optimize combustion plants performances. Large reductions of nitric oxide emissions have been successfully achieved in the past, by using either low NOx technologies of air burner or oxy-combustion systems. Numerous studies have particularly shown that the NOx output can be reduced remarkably by the use of oxygen instead of air [1–3]. In air combustion, nitrogen brings about a low yield of combustion and high energetic consumption because the nitrogen contained in the air acts as energy ballast. The total substitution of air by oxygen permits the increase of the laminar combustion velocity up to 1300%, the improvement of the heat yield, the rise of the adiabatic temperature of flame (2200 K for CH4-Air, 3090 K in oxy-combustion), the extension of the flammability limit up to 450%, the reduction of fuel consumption of 50% and from an environmental point of view, the decrease of the nitrogen oxide formation up to 95% [4,5]. Chahine [6] studied the effects of the oxygen enrichment on the flame characteristics, in particular, flame lift-off height, flame length, stability and instabilities at the bottom of the flame, front and top of the flame. His experiments, performed on a laminarflame in a coaxial burner, showed that oxygen enrichment has a very important role on the flame stability, on the energy efficiency, and thus enables to change the amplitude and frequency of instabilities. Beltrame et al. [7] studied experimentally and numerically a diffusion methane flame with against current using an airoxygen mixture as oxidant. They performed a comparison between a methane/air flame and a methane/air flame enriched up to 68% of oxygen. This comparison is focused on the temperature variation and species between these two types of flame. For a methane/air flame, the maximum temperature is about 2200 K located at the stagnation plane.
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کلمات کلیدی:
Numerical study of combustion characteristics for pulverized coal ... www.academia.edu/.../Numerical_study_of_combustion_characteristics_for_pulverize... Numerical study of combustion characteristics for pulverized coal under oxy-MILD operation. Author. Zhaojun Liu. Fuel Processing Technology 135 (2015) ... Numerical Study on Flame Mesoscopic-Characteristics of Oxy-Coal ... proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2579493 by R Liu - 2016 - Related articles ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International ... A numerical study of the effect of radial confinement on the ... - DOIs doi.org/10.1177/2041298310393446 A numerical investigation of the characteristics of laminar co-flow methane–oxygen diffusion flames has been carried out. The temperature and nitric oxide (NO) A Combined Experimental and Numerical Study of Laminar and ... link.springer.com/article/10.1007/s10494-015-9681-6 by F Hunger - 2016 - Cited by 1 - Related articles Nov 14, 2015 - Abstract. In the present study laminar and turbulent oxy-fuel jet flames are ... numerically based on the numerical species data and temperature. Clean Coal Technology and Sustainable Development: Proceedings of ... https://books.google.com/books?isbn=981102023X Guangxi Yue, Shuiqing Li - 2016 - Technology & Engineering Proc Combust Inst 30(2):2623–2629 Kim J, Schnell U (2007) Numerical ... M (2002) A study of combustion behavior of pulverized coal in high-temperature air. ... Buhre BJP, Elliott LK (2005) Oxy-fuel combustion technology for coal-fired power ... Experimental and Numerical Study on Laminar Flame Characteristics ... plu.mx/a/-yCM2GO53PtAfNXTyLCtM6yxZGC2xYG-iJEtpZCNg-w Experimental and Numerical Study on Laminar Flame Characteristics of Methane Oxy-fuel Mixtures Highly Diluted with CO 2. Citation data: Energy & Fuels ...
