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The asymmetric phenomenon of flame deflection in the combustion process of coal-fired boiler for different flow pattern, deflection angle and primary temperature were presented in this work. Numerical simulation was used for this paper to analyze the flow and heat transfer of the boiler furnace combustion. Air flow and combustion condition for the furnace firstly was simulated. And the nonlinear characteristics were loaded to analysis the furnace combustion. Thermal deviation which is the critical parameter for boiler was studied for the range of deflection angle from 0° to 18°, and the inlet primary temperature added + 0 K(BMCR), + 5 K, + 10 K, + 15 K by carrying out the numerical calculation. So the improvement methods for the thermal deviation are studied in the paper. [ABSTRACT FROM AUTHOR]

Natural convection in a cylinder with an internally slotted annulus was solved by SIMPLE algorithm, and the effects of different slotted structures on the nonlinear characteristics of natural convection were investigated. The results show that the equivalent thermal conductivityKeqincreases with Rayleigh number, and reaches the maximum in the vertical orientation. Nonlinear results were obtained by simulating the fluid flow at different conditions. With increasing Rayleigh number, heat transfer is intensified and the state of heat transfer changes from steady to unsteady. We investigated the effects of different slotted structures on natural convection and analyzed the corresponding nonlinear characteristics. [ABSTRACT FROM PUBLISHER]