CFD MODELING OF THE GM-50 (E-50-3.9-440GM) BOILER FURNACE

Abstract

The main purpose of the work is to analyze the feasibility of replacing standard burners with burners that operate using jet niche technology burners in power boilers, such as the GM-50 steam boiler (E-50-3.9-440GM). To achieve this goal, a computer model of the steam boiler and burners was built. The study was conducted using the ANSYS Student software suite. The application of numerical modeling methods using the ANSYS Student software suite allowed for a detailed analysis of the fuel combustion process in the steam boiler, evaluate its efficiency, and examine its impact on environmental indicators. The object of the study is the processes occurring during the combustion of gaseous fuel and their impact on the performance indicators of the GM-50 power boiler. The subject of the study is the CFD model of the fuel boiler GM-50, whose standard burners are capable of operating on both liquid and gaseous fuel. Methane was used as the fuel, and both standard axial burners and jet niche technology burners were used, which are more environmentally friendly. Verification of the CFD model, which was performed using a known analytical method, indicates that the discrepancy between the analytical calculations and the model calculations does not exceed 6.7 %. The average temperature of the flue gases in the “festoon window” was chosen as the comparison parameter. Analytically, the temperature value was obtained to be 1117 °C. The calculation using the CFD model, developed in ANSYS-CFX, indicates that the temperature value should be 1042 °C. It was determined that standard burners are less environmentally friendly than, for example, modern jet niche technology burners. For an air excess coefficient α = 1.2, the average value of nitrogen oxides at the outlet from the burner is 187 ppm. There is sense in replacing standard burners, for example, with jet niche technology burners, which are the most suitable for replacing standard ones. Bibl. 24, Fig. 6.