By Konstantinos G. Kyprianidis and Jan Skvaril
During the last few many years, fascinating advancements have taken position within the box of combustion know-how. the current edited quantity intends to hide contemporary advancements and supply a wide standpoint of the most important demanding situations that represent the sector. the objective viewers for this publication comprises engineers enthusiastic about combustion process layout, operational making plans and upkeep. brands and combustion know-how researchers also will enjoy the well timed and actual details supplied during this paintings.
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This textbook is a suite of technical papers that have been offered on the tenth foreign Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September 8-11, 2003 at Duke collage in Durham, North Carolina. The papers symbolize the most recent in state-of-the-art learn within the components of aeroacoustics, aerothermodynamics, computational tools, experimental trying out relating to move instabilities, flutter, compelled reaction, multistage, and rotor-stator results for turbomachinery.
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In the CFD modeling of turbulent flow with combustion it was assumed that volatiles are produced as a single compound that undergoes instantaneous breakup reaction into tar, light hydrocarbons, CO, CO2, and H2O. FG-DVC calculates devolatilization rate of tars and mentioned species. The most significant mass drop of fuel particle occurs when tar is evolved, which is produced in first place (Figure 12). For this reason tar release rate is used in devolatilization model. Knowing the volatile fraction of dry ash free coal (fvolatile) and assuming that residual char is pure carbon, we can calculate lower heating value of volatiles.
Experimental results confirm that the monitoring and control of fuel and air flow distribution allows to optimize combustion process by increasing thermal efficiency of the boiler. In the numerical part of investigation, the complex CFD model of pulverized coal boiler was made. The calculations of turbulent, reactive, and thermal flow processes were performed at different boiler operating conditions retrieved from power plant online monitoring system. The results of numerical simulations enable to identify the optimal boiler operating conditions.
The secondary air, which is fed to the gasification nozzle, is pre‐heated to a higher temperature. The flame thus does not cool down and combustibles burn up completely. The lower com‐ bustion chamber is lined with refractory concrete in which the final burning of all solid particles, which fall down, takes place. Figure 7(a) shows the original shaped piece through which the combustion air for secondary combustion was supplied by two large holes. Figure 7(b) shows the proposed shaped piece, which was also tested, through which the air was supplied along the longer side of the shaped piece by several holes.
Developments in Combustion Technology by Konstantinos G. Kyprianidis and Jan Skvaril