Title: Thermodynamic modelling to optimise flue gas of a refinery furnace

Authors: Hossein Ghorbani; Samira Heidari; Mohamad Amin Hemmati; Feridun Esmaeilzadeh

Addresses: Advanced Research Group for Gas Condensate Recovery, Department of Chemical and Petroleum Engineering, School of Chemical and Petroleum Engineering, Enhanced Oil and Gas Recovery Institute, Shiraz University, Shiraz, 7134851154, Iran ' Advanced Research Group for Gas Condensate Recovery, Department of Chemical and Petroleum Engineering, School of Chemical and Petroleum Engineering, Enhanced Oil and Gas Recovery Institute, Shiraz University, Shiraz, 7134851154, Iran ' Department of Chemical Engineering, Zahedan University, Zahedan, Iran ' Advanced Research Group for Gas Condensate Recovery, Department of Chemical and Petroleum Engineering, School of Chemical and Petroleum Engineering, Enhanced Oil and Gas Recovery Institute, Shiraz University, Shiraz, 7134851154, Iran

Abstract: The effect of flue gas including O₂, CO₂, H₂O, CO, and NO_x on the characteristics of the flame and the amounts of pollutants emission were investigated. A set of equations based on Gibbs free energy and component balance was developed and solved using Quasi-Newton method to obtain the volume percentage of the flue gas components. The validity of the proposed model was confirmed with the field data obtained from the fluid catalytic cracking (FCC) with an average absolute relative deviation (AARD) of less than 2%. The effect of pressure and temperature was investigated on the volume percentage of the flue gas components. The results revealed that increasing pressure shifted the reactions toward the reactants, which produced less moles of NO_x and CO₂ gases and more moles of CO gaseous. Rising temperature increased the amount of NO_x and CO gaseous and reduced the volume percentage of CO₂ gaseous in the flue gas. [Received: September 16, 2020; Accepted: May 28, 2021]

Keywords: furnace; flue gas; pollutant emission; thermodynamic modelling; damper angle.

DOI: 10.1504/IJOGCT.2022.125382

International Journal of Oil, Gas and Coal Technology, 2022 Vol.31 No.2, pp.122 - 136

Received: 15 Sep 2020
Accepted: 28 May 2021
Published online: 07 Sep 2022 *

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