18 th International Research/Expert Conference "Trends in the Development of Machinery and Associated Technology" TMT 2014, Budapest, Hungary 10-12 September, 2014 CHIMNEYS WITH REDUCED DRAFT AND VAPOR CONDENSATION OF WET FLUE GAS
In order to increase energy efficiency of heating plants and obtain lower CO2 emission into atmosphere, there is a tendency to keep exhaust-gas temperature lower than its typical value referred to as “acid dew point”. As a result, vapor condensation of wet flue gas appears in chimneys. Condensation occurs when the surface temperature is below the dew point of the vapor-gas mixture. Therefore, Vapor-Liquid Equilibrium models are required in order to determine the dew point of the mixture. A numerical model of turbulent vapor-air mixture flow through a chimney is presented. The velocity, temperature, as well as species fields are calculated via a finite-volume CFD code, whose validation is conducted employing a real object in chimney. The experiment on heat and mass transfer of a two-phase, two-component system is done Comparisons of gas temperature and pressure at the wall are shown, revealing a good prediction obtained by the model presented.