Boilers And Burners
Comprehensive CFD Simulation of the Combustion Chamber of SHAZAND Power Plant Boiler
This project was performed in 2012 with the goal of comprehensive analysis, including CFD simulation of combustion and pollution for boiler combustion chamber in different operating conditions. This 325 MW boiler has a front and rear walls each include 12 burners. At the first step wind box was simulated. Using wind box simulations the static pressure for each 24 burners due to non-uniform distribution of air was specified. Then with a precise model and mesh generation of burners, the percent of air distribution in primary, secondary and tertiary airways was specified. With the air mass flow rate for each burner and the percentage of distribution in each airways, including burner guide vanes, a comprehensive CFD simulation for combustion chamber was executed. Based on studies the effect of different operating parameters such as GR fan was specified. After a complete study, various strategies for air pollution reduction and combustion chamber optimization were carried out and a deep insight into boiler design and optimization was produced in Arya Alborz Company.

Comprehensive CFD Simulation of SHAZAND Power Plant Burners
This project was performed in 2012 to specify the percentage of air distribution in primary, secondary and tertiary airways in a burner. At first step a 3D model of burner was created and a proper mesh was generated. Then using CFD simulations the combustion and air distribution in different airways at various inlet static pressures were carried out. These simulations were executed as a primary step for a precise and comprehensive simulation of a 325 MW boiler combustion chamber.

Comprehensive CFD Simulation of a 325 MW SHAZAND Boiler Wind Box
This project was performed in 2012 to specify the air distribution and static pressure at the inlet of each 24 burners. After a 3D modeling and mesh generation, air flow distribution was simulated. Based on aerodynamic design of ducts, significant non-uniformity of air flow distribution (300%) in 24 burners was observed. The lack of formation of the stoichiometric combustion, results in the production of air pollution. Also increasing the air flow rate leads to an increase in flame length in some burners, flame inclination towards some water walls and resulting in overheating, burning and destruction of the water walls. Due to the poor design of wind box, optimization for resolving the problems was carried out with Arya Alborz engineering group.

Comprehensive CFD Simulation of a Three pass Fire Tube Boiler
This project was performed with the aim of simulation and optimization of a three pass fire tube boiler in 2013. At first step the geometry of a three pass fire tube boiler with a capacity of 25,000 lbs/hr was created. After the 3D modeling a professional mesh was generated. Then by applying the air and fuel mass flow rates as inlet boundary conditions, fluid flow and combustion were simulated. Using precise CFD simulations the percentage of convection and radiation heat transfer in first, second and third pass of boiler were specified. In second step the optimization for higher performance was provided.

Comprehensive CFD Simulation of a Steam Reforming Reactor at TEHRAN Refinery
This project was performed in 2006 for a complete performance analysis of the reactor and to specify the optimum condition for burner combustion. Generally, hydrogen is used in various industries for reduction. For hydrogen production in refineries, water vapor and methane, flow in tubes filled with catalysts. The heat is transferred from outside of tubes from the flame formed by combustion of gas in a counter flow manner. The formation of chemical reactions inside the reactor is so important. Heat transfer reduction to the feed, reduces the reactor performance and flame length extension can lead to bending and deformation of the reactor tubes. Due to 12 meters height of reactor, pipes replacement requires unit shut down and imposition of heavy costs. As target of this project the fuel and air ratio and mass flow rates were adjusted to efficiently transfer the heat for desired chemical reaction inside the reactor and to prevent the pipe bending and destructions.

Combustion Simulation Using CFD Techniques in a Gas Heater
This project was performed in 2003 to study the effect of geometric parameters on the performance of a gas heater for optimization. After 3D modeling and mesh generation, flow distribution and combustion were simulated and the effect of geometric parameters for optimization was carried out.