تاثیر ترکیب گاز سنتزی تولید شده به روش گازسازی زیست توده بر عملکرد و آلاینده-های یک موتور RCCI دیزل-گاز سنتزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک- دانشکده مهندسی مکانیک- دانشگاه تبریز

2 گروه مهندسی مکانیک، دانشکده مکانیک، دانشگاه تبریز

3 مهندسی مکانیک، دانشگاه بناب

چکیده

گاز سنتزی می ­تواند گزینه مناسبی در موتورهای اشتعال تراکمی کنترل واکنشی باشد. هدف پژوهش حاضر بررسی عددی تاثیر گازهای سنتزی با ترکیبات متفاوت بر عملکرد موتور و آلاینده­ های آن در یک انرژی ورودی ثابت است. بر همین اساس، سه ­گونه متفاوت از گازهای سنتزی تولیدشده توسط روش­های گازسازی، برای مقایسه با گاز سنتزی شبیه­ سازی ­شده مرکب از هیدروژن و مونوکسیدکربن خالص، انتخاب شده­ اند. با توجه به نتایج به ­دست­ آمده، استفاده از گاز سنتز خروجی از گازسازها در موتورهای یادشده منجربه کاهش تولید اکسیدهای­ نیتروژن درازای افزایش تولید دوده، مونوکسیدکربن و هیدروکربن­ های نسوخته و کاهش بازده ناخالص اندیکاتوری نسبت­ به گاز سنتزی        شبیه ­سازی ­شده می ­شود. نسبت جرم هیدروژن به جرم سایر گونه­ های قابل احتراق در سوخت سنتزی با فشار و دمای بیشینه، بازده ناخالص اندیکاتوری و اکسیدهای ­نیتروژن نسبت مستقیم و با سایر آلاینده ­ها نسبت عکس دارد. گاز سنتزی نوع اول در حالت 60 درصد جایگزینی با دیزل، با کاهش 78 درصدی اکسیدهای ­نیتروژن و 7/11 درصدی بازده ناخالص اندیکاتوری نسبت­به دیزل خالص و افزایش 6/3 درصدی تخریب اگزرژی نسبت ­به گاز سنتزی شبیه­ سازی ­شده، بهترین گزینه برای استفاده در موتور در تمامی حالات جایگزینی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of the composition of syngas derived from biomass gasification on performance and emission characteristic of a diesel-syngas RCCI engine

نویسندگان [English]

  • Mortaza Yari 1
  • Navid Kousheshi 2
  • Ali Saberimehr 3
1 Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz
2 Mechanical engineering faculty, Tabriz university
3 Mechanical Engineering, University of Bonab
چکیده [English]

Syngas, mainly composed of hydrogen and carbon monoxide, is a suitable candidate for RCCI engines. In the present effort, the impact of syngases with different compositions, on the performance and emissions of a RCCI engine, at constant input energy, has been numerically investigated. For this purpose, different gasification processes have been employed to generate three different types of syngases for comparison with the simulated one which contains solely H2 and CO. Using these kinds of syngases compared with simulated one, results in less NOx in expense of more other emissions and less GIE. The ratio of hydrogen mass to the mass of other combustible species has a direct relation with maximum pressure and temperature, gross indicated efficiency (GIE) and NOx and a reverse relation with other pollutants. Syngas type I with a 78% reduction of NOx and a 11.7% reduction of GIE compared to conventional diesel and a 3.6% increase of exergy destruction compared to simulated syngas is the best alternative syngas in all cases.

کلیدواژه‌ها [English]

  • RCCI Engine
  • Low Temperature Combustion
  • Pollution
  • Syngas

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  • تاریخ دریافت: 21 اردیبهشت 1398
  • تاریخ بازنگری: 20 تیر 1398
  • تاریخ پذیرش: 28 تیر 1398

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