بررسی عملکرد و آلاینده‌های موتور اشتعال تراکمی کنترل واکنشی با سوخت ترکیبی دیزل و گاز سنتزی به عمل آمده از گازسازی زیست توده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تبریز

2 بناب-فنی و مهندسی- مهندسی مکانیک

چکیده

یکی از تازه‌ترین روش‌هایی که در سالهای اخیر بسیار مورد توجه دانشمندان در حوزه موتورهای احتراق داخلی قرار گرفته است، روش‌های احتراق در دماهای پایین است. در این بین نقش موتورهای اشتعال تراکمی کنترل واکنشی بسیار قابل توجه است. در این مقاله تلاش شده است تا با استفاده از نرم افزار کانورج تأثیر ترکیبات مختلف گازهای سنتزی تولید شده توسط روش‌های گازسازی، بر عملکرد موتور و آلاینده‌ها مورد بررسی قرار گیرد. برای رسیدن به این مقصود، از 4 نوع سوخت (ترکیب هیدروژن و مونوکسید کربن به عنوان گاز سنتزی ایده آل، هیدروژن خالص و دو نوع گاز سنتزی متفاوت خروجی از گازسازها) استفاده شده است. نتیجه این پژوهش انعطاف پذیری موتور در استفاده از سوخت‌های سنتزی متنوع را اثبات می‌کند. از سوی دیگر نتایج حاکی از آن است که گاز سنتزی تولید شده توسط روش‌های متداول مانند گازسازی، منجر به کاهش تولید اکسیدهای نیتروژن در ازای افزایش تولید دوده، نسبت به ترکیب ایده‌آل گاز سنتزی می‌گردد و این اختلاف با بالا رفتن میزان جایگزینی دیزل با سوخت سنتزی، افزایش می‌یابد. همچنین احتمال ناپایداری و حتی عدم شروع احتراق در بارهای کم، به علت وجود نیتروژن در ترکیب بعضی از گازهای سنتزی، دور از انتظار نخواهد بود. علی‌رغم مزایای بالای هیدروژن به عنوان یکی از اجزای اصلی گاز سنتزی، استفاده از آن به تنهایی و در مقادیر بالا با وجود کاهش مطلوب دوده، افزایش شدید نرخ افزایش فشار و میزان آلاینده اکسیدهای نیتروژن را در پی خواهد داشت که به هیچ عنوان مطلوب نیست.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Performance and Emission Characteristic of a Reactivity Controlled Compression Ignition Engine Fueled By a Mixture of Diesel and Syngas Derived From Biomass Gasification

نویسندگان [English]

  • navid Kousheshi 1
  • Mortaza Yari 1
  • Ali Saberi Mehr 2
1 University of Bonab
2 بناب-فنی و مهندسی- مهندسی مکانیک
چکیده [English]

Recently, low-temperature combustion methods have become very popular in the field of combustion. Reactivity controlled compression ignition is a novel combustion concept with its own advantages. The role of these engines in rectifying the disadvantages of other methods is inevitable. This paper studies the influence of using various types of syngas on combustion and emission characteristics of syngas/diesel reactivity controlled compression ignition engine using Converge CFD. Four types of syngas (ideal syngas composed of solely hydrogen and carbon monoxide, two different types of syngases produced by gasifiers and pure hydrogen) are selected for comparison. Results showed the possibility of using various forms of syngases as low reactivity fuel. Using these kinds of syngases compared with ideal one results in fewer nitrogen oxides at the expense of more soot and it gets worse by increasing the fraction of syngas in premixed air. It shouldn’t be ignored, due to the presence of nitrogen in some types, the engine may suffer from weak combustion and sometimes misfire at low loads as well. Using pure hydrogen, despite its advantages as the main part of syngas, in high quantities, notwithstanding the significant reduction of soot, causes the increase of nitrogen oxides and pressure rise rate amounts which are not desirable.

کلیدواژه‌ها [English]

  • Reactivity controlled compression ignition engine
  • Low Temperature Combustion
  • Pollution
  • Syngas
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