نوع مقاله : مقاله پژوهشی

نویسندگان

گروه محیط زیست، دانشکده کشاورزی، دانشگاه ازاد اسلامی اصفهان، اصفهان، ایران

چکیده

سابقه و هدف:
با آغاز عصر صنعتی و رشد روزافزون تولید و مصرف، تغییرات بسیاری در زندگی انسان­ ها رخ داده است. نیاز به انرژی و تامین آن از سوخت ­های فسیلی مانند زغال سنگ، نفت و گاز طبیعی سبب نشر شدید گازهایی مانند کربن دی­اکسید (CO2) در جو شده است.
مواد و روش ­ها:
بمنظور بررسی فاکتورهای تاثیر گذار بر تولید دی اکسید کربن در واحدهای صنعتی پرسشنامه­ ای براساس مشخصات واحدهای صنعتی از جمله محل نمونه ­برداری، سطح مقطع دودکش، درجه حرارت محیط، میزان رطوبت نسبی، قطر نازل انتخابی، دمای گاز خروجی دودکش، سرعت گاز خروجی، دبی گاز خروجی، دبی گاز خروجی در شرایط استاندارد، حجم مکش شده، حجم مکش شده در شرایط استاندارد، وزن اولیه فیلتر، وزن ثانویه فیلتر، اختلاف وزن فیلتر، میزان ذرات معلق خروجی دودکش خشک و میزان ذرات معلق خروجی دودکش تر گردید. زمان نمونه ­برداری اواسط هر فصل بوده است، که به ­ترتیب 15 اردیبهشت، 15 مرداد، 15 آبان و 15 بهمن ماه است.
نتایج و بحث:
نتایج حاصل از این تحقیق نشان می ­دهد با افزایش سطح مقطع دودکش مقدار دی­ اکسید کربن و هوای مازاد نیز افزایش یافته است. همچنین با افزایش میزان رطوبت نسبی مقدار دی­ اکسید کربن و هوای مازاد کاهش پیدا کرده که بیانگر شرایط بهینه محیطی از نظر آلودگی می ­باشد. در خروجی دودکش با کاهش قطر نازل انتخابی مقدار دی ­اکسید کربن و هوای مازاد نیز کاهش یافت. با افزایش دمای گاز خروجی دودکش نیز کاهش مقدار دی ­اکسید کربن و هوای مازاد دیده می­ شود و نیز با افزایش سرعت گاز خروجی مقدار دی ­اکسید کربن و هوای مازاد کاهش پیدا کرد. و در آخر با افزایش حجم مکش شده در شرایط استاندارد مقدار دی­اکسید کربن و هوای مازاد با هم افزایش پیدا کرد.
نتیجه ­گیری:
براساس نتایج این مطالعه، آنالیز خط مرزی یک روش مناسب برای تعیین اثرهای فاکتورهای موثر بر تولید دی ­اکسید کربن و هوای مازاد است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the effective factors in CO2 production in industrial units of Isfahan Province using boundary analysis

نویسندگان [English]

  • Behzad Sanatinia
  • Mohammad Hadi Abolhasani
  • Atefeh Chamani

Department of environmental Science, Faculty of Agriculture and Natural Resources, Islamic Azad University of Isfahan, Isfahan, Iran

چکیده [English]

Introduction:
Significant changes have been occurred in human life along with industrialization and an increase in production and consumption. Demand for energy and the use of fossil fuels, such as coal, petroleum, and gas, led to a great dispersion of CO2 in the atmosphere. The aim of this study was to investigate the effect of various factors on the production of carbon dioxide in industrial units.
Material and methods:
A questionnaire was developed based on industrial units characteristics such as sampling place, chimney cross-section, ambient temperature, relative humidity level, selected nozzle diameter, the temperature of chimney output gas, speed and discharge of output gas, discharge of output gas under standard conditions, suctioned volume, suctioned volume under standard conditions, filter initial weight, filter secondary weight, the weight difference between filters, suspended particles amount in the dry chimney, and suspended particles amount in the wet chimney. Samplings were done in the middle of each season i.e. 5 May, 6 August, 6 November, and 4 February. The effects of the mentioned factors were investigated on CO2 and surplus air.
Results and discussion:
The results showed that CO2 and surplus air levels increased along with an increase in the chimney cross-section. In addition, CO2 and surplus air levels decreased as humidity increased, Indicating optimal environmental conditions in terms of pollution. In the chimney outlet, a shorter nozzle diameter resulted in lower CO2 and surplus air levels. CO2 and surplus air levels decreased when temperature or the speed of chimney output gas increased. Finally, the increase in suctioned volume under standard conditions led to an increase in CO2 and surplus air levels.
Conclusion:
According to the results, The results of this study showed that with increasing chimney cross section, the amount of carbon dioxide and excess air has also increased and are directly related to each other. also, boundary line analysis is a suitable model for the determination of the effects of the mentioned factors on CO2 and surplus air levels.

کلیدواژه‌ها [English]

  • Surplus air
  • CO2
  • Boundary line analysis

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