مدلسازی آثار افزودن دوده و محصولات احتراق ناقص متان بر سینتیک شیمیایی احتراق متان و تولید آلاینده ‏ها

نوع مقاله : مقاله پژوهشی

نویسندگان

مهندسی مکانیک، دانشگاه بیرجند، بیرجند، ایران

چکیده

تحقیقات پیشین نشان‌دهنده نقش بارز افزودن دوده در بهبود تابش شعله سوخت گاز طبیعی است؛ اما اثر این افزودنی بر تولید آلاینده‌ها و همچنین روند واکنش احتراق متان کمتر مورد توجه بوده است. پژوهش حاضر با استفاده از مکانیزیم GRI3.0 و در شرایط صفر بعدی توسط کدهای کانترا به بررسی سینتیکی اثر افزودن دوده با فرض حالت گازی بر واکنش‌های زنجیرهای احتراق متان و کسر مولی آلاینده‌ها و گونه‌های میانی احتراق متان می‌پردازد. همچنین افزودن محصولات احتراق ناقص متان به عنوان راهکاری برای کنترل آلاینده‌ها مورد ارزیابی سینتیکی قرارگرفته است. نتایج دقت قابل قبول استفاده از مدل صفر بعدی و مکانیزم GRI3.0 با فرض رفتاری گازی برای ذرات دوده برای ذرات با قطر کمتر از 25میکرون را نشان می‌دهد. تحلیل سینتیکی حاکی است افزودن دوده با فرض حالت گازی با افزایش نرخ تولید رادیکال‌های فعال در احتراق موجب تولید بیشتر آلاینده COشده و با افزایش نسبی دما موجب رشد کسر مولی آلاینده NOخواهد شد. از طرفی افزودن محصولات احتراق ناقص باعث کاهش تولید آلاینده COشده و دمای احتراق را نیز می‌کاهد. بر این اساس می‌توان به منظور افزایش تابش شعله و همچنین کنترل آلاینده‌ها ترکیبی از افزودنی کربن و محصولات احتراق ناقص را به احتراق متان اضافه نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effects of Adding Gaseous Soot and Methane Incomplete Combustion Products on Detailed Chemical Kinetics Combustion of Methane and Pollutants

نویسندگان [English]

  • A. Saeedi
  • R. Jalali Mehrabad
Department of Mechanical Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran
چکیده [English]

The previous researches show the great effect of soot on natural gas flame radiation. The addition of soot into methane flame is widely proposed by the researchers as a good method to enhance radiation from non-luminous flames. But the effect of adding soot on the chain reactions of methane combustion and NO & CO emission have been not reviewed. The present study investigates the effects of adding gaseous soot on the progress of natural gas combustion and NO & CO emission in the zero-dimensional zone by means of GRI 3.0 mechanism in the Cantera python package. Also, methane incomplete combustion products are considered as an additive to control the pollutants. The results indicate that the addition of gaseous soot into natural-gas flame leads to increase in adiabatic temperature, the rate of decomposition reactions of fuel and brings more CO and NO production. In the other hand, the addition of methane-air incomplete combustion products into natural gas reaction cause to reduce CO production and decrease in the adiabatic flame temperature. So, in order to enhance radiation of methane flame and pollutants reduction the additive that composed of of gaseous soot and methane-air incomplete combustion can be used.

کلیدواژه‌ها [English]

  • natural gas
  • soot
  • chemical kinetics
  • Combustion
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