Document Type : Original Article


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


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.
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.


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