Prediction of Air Pollutants Emitting from Chimney of A CHP Using CFD

Thermal power plant is the main source of base electric power generation for domestic and industrial use. The baseline pollutants emitted from the chimney stacks undergo dispersion in the atmosphere with its supporting meteorological condition and deteriorates the quality of the ambient air and hence a serious threat to the biotic and abiotic elements. The current research work involves the estimation of the ground level concentration (GLC) for the baseline pollutants (NO, N2O and SO2) obtained due to the burning of G-grade coal through fluidised combustion process. These pollutants are emitted from 2 chimneys in the study domain. The problem has been simulated using ANSYS CFX 15.0 based on Gaussian dispersion model, to quantify the steady ground level concentration up to 10km radius areal domain. This simulation process requires the input as the meteorological data obtained through online weather monitoring centres at the plant and also the thermo physical properties of the exhaust gases along with the chimney specifications of a combined heat and power plant (CHP). The simulated results show that the maximum steady ground level concentration of NO, N2O and SO2 are 34.39μgm/m, 50.79μgm/m and 31.01μgm/m respectively. The ground level concentrations of baseline pollutants obtained by simulation through ANSYS CFX 15.0 are within acceptance level as per the National Ambient Air Quality Standards (NAAQS) guidelines and accordingly the concerned industry has been intimated regarding the ambient air quality at the onsite and offsite of their plant.