The objective is to simulate coal combustion of a 500 MW pulverized coal fired boiler in which the framework for the solution approach is based on numerical solutions using CFD.
A 3D modeling of a 500 MW coal-fired boiler was prepared and different operating scenarios were simulated. The modeling of non-reacting air flow is done in two steps:
1.a cold air flow model simulation by solving the governing equations for mass and momentum in the boiler.
2.A hot airflow model where the governing energy equation is solved to obtain the temperature field. With the inclusion of a radiation model, a significant drop in the temperature is observed, with the maximum temperature being 3150 K.
From the simulation, it can be concluded that the results are very close to the realistic picture in a tangentially fired coal boiler. Validation was performed with tests conducted onsite with a 500 MW boiler. The re-heater metal tube temperature (average 572 ºC) was seen to match closely with the experimental values (average 559 ºC) with a maximum deviation of +2.32%.well below the allowable value (32.4 ksi) for the A36 steel material.