پیاده‌سازی و تحلیل اقتصادی احتراق بدون شعله در یک دیگ بخار آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 معاون گروه سیستمهای انرژی، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی

2 آزمایشگاه بهینه سازی سیستمهای انرژی، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی

3 مدیر گروه سیستمهای انرژی، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی

چکیده

در این مقاله، طراحی و پیاده‌ سازی رژیم احتراق بدون شعله در یک دیگ بخار آزمایشگاهی با ظرفیت 100 کیلووات ازنظر فنی و اقتصادی بررسی شده است. هدف اصلی مشخص­ کردن عوامل مؤثر بر پایداری رژیم احتراقی مذکور برای افزایش بازده حرارتی (کاهش مصرف سوخت) و به­ طور همزمان کاهش تولید آلاینده‌هاست. در این پروژه، با استفاده از یک مشعل قدیمی از نوع پیش‌آمیخته و بدون نیاز به جاگزینی آن با مشعل­های پیشرفته و پرهزینه، رژیم احتراق بدون شعله با ترکیب تکنیک­ های طراحی مکانیکی (ساخت رکوپراتور بازده ­بالا) و طراحی فرایندی (تنظیم پیش­گرمایش و رقیق‌سازی هوا) در یک دیگ بخار آزمایشگاهی ایجاد شده است. در آزمایش ­های انجام ­گرفته ویژگی­ های کیفی و کمی رژیم احتراق بدون شعله نظیر یکنواختی توزیع دما در محفظه احتراق، شعله حجیم و کم ­فروغ، افزایش بازده و کاهش انتشار آلاینده‌ها حاصل شده است. به­ طور مشخص، مزایای پیاده‌سازی احتراق بدون شعله در دیگ بخار آزمایشگاهی شامل10 درصد کاهش مصرف سوخت به­ همراه 13درصد کاهش تولید ناکس بوده است. همچنین، نتایج ارزیابی اقتصادی طرح حاضر با استفاده از معیارهای ارزش خالص فعلی و دوره بازگشت سرمایه در شرایط مختلف اقتصادی نشان دهنده اقتصادی ­بودن و جذابیت سرمایه ­گذاری در پروژه ­های مشابه است.
 

کلیدواژه‌ها

عنوان مقاله [English]

Implementation and economic analysis of MILD combustion in a lab-scale boiler

نویسندگان [English]

  • Javad Aminian 1
  • Ghasem Khabbazian 2
  • Ramin Haghighi Khoshkhoo 3
1 Energy Systems Division, Mechanical and Energy Engineering Department, Shahid Beheshti University
2 Optimization of Energy Systems Lab., Mechanical and Energy Engineering Department, Shahid Beheshti University.
3 Head of Energy Systems Division, Mechanical and Energy Engineering Department, Shahid Beheshti University
چکیده [English]

Implementation and economic analysis of MILD combustion in a
lab-scale boiler
 
Ghasem Khabbazian1, Javad Aminian2* and Ramin Haghighi Khoshkhou3
1- PhD student, Department of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
2- Assistant Professor, Department of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
3- Associate Professor, Department of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
*Corresponding author
 (Received: 2018.11.28, Received in revised form: 2019.1.20, Accepted: 2019.2.5)
 
In this paper design and implementation of a MILD combustion system in a 100 kW boiler was investigated from technical and economic viewpoints. The main objective of this study is determination of the factors affecting the stability of the combustion regimes in a typical domestic utility boiler, leading in simultaneous thermal efficiency enhancement and emission reduction. In particular, the so-called MILD combustion was established in a conventional boiler equipped with an ordinary premixed burner without requiring to replace with expensive modern burners. In the experiments, the qualitative and quantitative features of MILD regime such as uniform temperature distribution in the combustion chamber, volumetric and weakened flame, increased efficiency and decreased NOx emissions were achieved. The results showed a 10% fuel saving as well as 13% reduction in NOx. In addition, the economic evaluation of presented method to establish MILD combustion was performed using the net present value and payback period measures. The analysis results suggest that investment in the MILD system retrofitting plan is cost-effective and economically attractive in similar cases.
 
 
 
 

کلیدواژه‌ها [English]

  • Keywords: MILD Combustion
  • Fuel Conservation
  • Emission Reduction
  • Economic Evaluation

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  • تاریخ دریافت: 07 آذر 1397
  • تاریخ بازنگری: 30 دی 1397
  • تاریخ پذیرش: 16 بهمن 1397

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