a.r rahmati - Department of mechanical engineering, university of Kashan, Kashan, Iran
a jahani - Department of mechanical engineering, university of Kashan, Kashan, Iran Department of mechanical engineering, university of Islamic Azad branch of Behbahan, Behbahan, Iran

There is a variety of pollutants, Due to the combustion of natural gas-fired gas.A number of pollutants in the combustion of natural gas, depend on the quality and composition of the gas components. Major changes in the composition of natural gas causes changes in furnace performance and emissions levels.The analysis of Refinery production of gas composition changes on furnace combustion products Combustion is required to solve complex relationships Increased error rate at the time it analyzes andalso makes it more time. This cause the use of modeling methods that have predictive power and highaccuracy are required. The goal of the paper is to investigate the effect of gas composition on combustion products. In this article, using experimental data Bidboland gas refinery, Changes in composition and Convection of refinery gas-fired combustion products of a refinery was studied in theperiod of time And model by neural network. Increasing the amount of 5% methane, NOX, increases 39 percent, the amount of CO increases, 28% and CO2 increase 15 percent. Increasing 30% ethane, NOX pollutant, increased 23 percent, CO2, increases 8%, CO got 24 time more. Increasing 30%propane, CO increase 21%in the amount, CO2 has increased seven percent and NOX increases 39%.Generally, increasing 5% in hydrocarbon gas, the carbon content is increased to an average of 11 percent. Increasing 40% H2S, amount of SO2, increase on average 144 times. Increasing 30% N2, amount of NOX, increase 19%.

Combustion of natural gas, Gas compounds, Combustion products, furnace, Artificial Neural Networks, compositions change