بررسی عددی تأثیر محتوای رطوبت، قطر ذره و دبی جرمی سوخت بر احتراق سوخت جامد مشتق شده از لجن نفتی پالایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.

2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد

چکیده

چکیده: سالانه مقدار زیادی لجن نفتی حین بهره برداری و فعالیت‌های فرآیندی بر روی نفت خام تولید می‌شود. سوزاندن لجن ‌نفتی در راستای بازیافت انرژی موجود در آن و همچنین به‌عنوان راهکاری جهت مدیریت این پسماند خطرناک می‌تواند مورد توجه قرار گیرد. در تحقیق حاضر، شبیه‌سازی عددی احتراق سوخت جامد مشتق شده از لجن نفتی پالایشگاهی در یک کوره‌ی دو بعدی دارای تقارن محوری انجام شده است. بررسی تاثیر قطر ذرات سوخت بر فرایند احتراق نشان داد با افزایش قطر ذرات از m 5-10×5 تا m 4-10×6، مقدار بیشینه‌ی دما حدود 14 درصد کاهش می‌یابد و مکان بیشینه‌ی دما نیز cm 40 از ورودی کوره دورتر می‌شود. به منظور بررسی اثر میزان آب‌گیری از لجن نفتی پالایشگاهی بر خواص احتراقی سوخت، مطالعه‌ای بر روی اثر میزان محتوای رطوبت سوخت انجام گرفت. نتایج حاضر نشان داد افزایش 30 درصدی جرم رطوبت در آنالیز تقریبی سوخت، مقدار بیشینه‌ی دما را در حدود 11 درصد کاهش می‌دهد. همچنین، تاثیر میزان دبی جرمی سوخت ورودی در بازهgr/s 15/0 تا gr/s 29/0 بررسی شد. در بازه مورد بررسی کاهش دبی سوخت تأثیر قابل توجهی بر بیشینه‌ی دمای گازهای احتراق نداشته، در حالی که میزان انتشار گازهای CO2 و CO به نحو مطلوبی کاهش می‌یابد. در نهایت نتایج حاصل از احتراق سوخت جامد مشتق شده از لجن نفتی نشان داد با انجام آماده‌ سازی سوخت نظیر کاهش رطوبت و استفاده از ذرات با قطر کوچک‌تر می‌توان نتایج قابل قبولی به‌دست آورد و از ارزش حرارتی لجن نفتی به نحو مطلوبی استفاده کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Study of the Effect of Moisture Content, Particle Diameter and Fuel Mass Loading on Combustion of Solid Fuel Derived from Refinery Oily-Sludge

نویسندگان [English]

  • Soulmaz Farahvashi 1
  • SOBHAN EMAMI 2
1 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد
چکیده [English]

A large amount of oil sludge is produced annually during the operation and process activities on crude oil. The burning of oil sludge can be considered as an approach in order to recover the energy as well as to control and mitigate risks of this hazardous waste. In the present study, the combustion of solid fuel derived from refinery oily-sludge is conducted numerically in a 2-D axisymmetric furnace. Investigating the effect of fuel particle diameter on the combustion process shows that with increasing particle diameter the maximum temperature reduces and the maximum temperature location 
A large amount of oil sludge is produced annually during the operation and process activities on crude oil. The burning of oil sludge can be considered as an approach in order to recover the energy as well as to control and mitigate risks of this hazardous waste. In the present study, the combustion of solid fuel derived from refinery oily-sludge is conducted numerically in a 2-D axisymmetric furnace. Investigating the effect of fuel particle diameter on the combustion process shows that with increasing particle diameter the maximum temperature reduces and the maximum temperature location goes farther from the furnace entrance. In order to investigate the effect of dewatering refinery oily-sludge on combustion properties, a study was conducted on the moisture content of fuel. The results show that an increase of 30% in moisture content in proximate fuel analysis reduces the maximum temperature by about 11%. Also, the effect of the fuel mass flow rate is investigated in the range of 0.15 gr/s to 0.29 gr/s. The results show that reducing the fuel mass load has a slight impact on maximum temperature of gas flow. However, CO and CO2 emissions experience a desirable decline.The study on combustion of solid fuels derived from oil-sludge shows that by making fuel preparation such as reducing the moisture content and using smaller particles, it is possible to exploit the heat value of oil sludge.
 

کلیدواژه‌ها [English]

  • Refinery oily-sludge
  • Pulverized solid fuel combustion
  • Particle diameter
  • Moisture content
  • Fuel mass flow rate
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