Abstract
Gas Gas Heater (GGH) is a facility that cools the hot gas generated after combustion to the temperature appropriate to react in the absorption tower and improves the corrosion and ventilation of the duct through heat exchange of the low-temperature gas discharged again through the desulfurization process with the hot gas. The hot-temperature gas passing through the GGH causes scale build-up, such as scattered gypsum inside the thermal element, including various air pollutants, which increases the differential pressure, causing losses of fan load and power plant shutdown. Computational fluid dynamics (CFD) was used to analyze how much the MU_Profile was developed to effectively reduce the differential pressure compared to the LS_Profile currently installed in the power plant. An optimized k-e model was found by performing comparative verification with actual power plant operation data, and this model was applied to MU_Profile for analysis. In addition, as the unit was expanded, the analysis grid and analysis time were reduced by using the porous medium method. As a result, MU_Profile decreased by -28.49% (based on Sector Unit 100% NR) in the differential pressure portion than LS_Profile. In the heat exchange performance, it was confirmed that MU_Profile was -15.61% (based on Sector Unit 100% NR) than LS_Profile. In terms of heat exchange LS is better, but heat exchange in GGH is performed to eliminate the white smoke effect of the gas escaping to the stack, and it was confirmed that there was no white smoke effect in both the LS_Profile and MU_Prfile. Therefore, the newly developed MU_Profile improves GGH performance than LS_Profile.
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