Sharif Digital Repository

Different methods can be used to produce reduction gas. One example is using coal. But today there’s a tendency to use natural gas. One way of transforming natural gas to reduction gas is to burn it with gases produced by combustion, such as or vapor; usually a catalyst is used in this method. Another method is burning natural gas directly with oxygen or air. The recent method is of benefit especially in Iran, because of available natural gas resources and avoiding catalyst problems. Designing a burner for this purpose is an important step in reaching this goal. In this project such a burner is designed and manufactured. The burner manufactured in this project burns natural gas with... 

In recent decade, pollution reduction is one of challenges in front of engineers. Nowadays accurate prediction of temperature and harmful Pollutants is vital, this leads to various models for turbulent combustion to predict combustion-generated pollutants. One of the most widely used models for simulating turbulent combustion is Flamelet because of separating the chemical reactions and the turbulent flow field. The unsteady state assumption of Flamelet model is capable of reasonably predict complicated phenomenon such as slow chemical reaction and radiation. The purpose of this study is to calculate combustion-generated emissions by Flamelet model and reduce these emissions by engineering... 

Ethylene process is one of the most complex systems in petrochemical industries.The first section of the ethylene plant is the cracking furnace.The radiant section of predicted olefin furnaces is symmetrical with respect to a plane through the center line of the furnace and at an angle of 90° with the side walls. There are a total of 24 vertical radiant coils located centrally in the firebox wherein, bottom andside wall burners supply the heat necessary. Each four coils known as a ZONE so, as a result there are six zones, called zone A through F. Failures(rapture, creep, material degradation) rate on the coils decreases from zone A to zone F (A, B, C, D, E and F) respectively.From...