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IntroductionTangentially fired boilers are mainly used in the power generation industry due to the proper flame distribution and uniform heat flux. These boilers are characterized by the shape of the furnace and the location of fuel and air entrances. They usually have four faces and four corners that fuel and air are supplied from these corners. During the operation due to the flow circulation, the flames are tangentially connected and create a virtual circle called the target circle in the center of the furnace. McKenty et al.[1] developed a model for a dual fuel tangentially fired boiler using computational fluid dynamics and evaluated the flow behavior and NO X production in the furnace. Modlinski [2] developed a model to retrofit an auxiliary boiler using replacement of current burners to a new tangent one using computational fluid dynamics. The purpose of this modeling is to analyze the flow and combustion performance in the furnace. Fang et al. [3] developed the computational fluid dynamics model of multi-fuel combustion in a 200 MW tangentially fired utility boiler. They concluded that multi-fuel combustion is one of the options that can be used to improve combustion behavior and reduce pollutant emissions. Depman [4] updated the computational fluid dynamics model of the industrial boilers of the Iowa University, which had previously been developed. He upgraded boundary conditions and flow models of simulation to accurate, realistic simulations. Shi et al. [5] evaluated NO X production in a 300 MW boiler using computational fluid dynamics modeling. They concluded that retrofit of the combustion system not only reduced the total NO X production concentration at the boiler output but also affected the NO X formation region in the furnace. Tang et al.