Numerical Simulation On In-furnace Combustion Process Of 1000MW Ultra-supercritical Power Boiler

In this paper, in the furnace combustion process and contamination and slagging of boiler operating are fully understudied and analyzing. In the meantime, the research is conducted that the numerical simulation of the in-furnace combustion process for improving the numerical simulation models of furnace. Finally basing on a foundation of the FLUENT computation hydrodynamics software, studying on the 1000MW ultra-supercritical swirl-opposed boiler of coal combustion, according to characteristic of boiler which is simulated, establishing the three dimensional frame construction with GAMBIT, carrying on the grid division, then selecting the appropriate model of mathematics and physics and the suitable parameter and the variable, setting up the boundary condition, making three-dimensional numerical simulation of furnace combustion, receiving the distributions of temperature region, velocity region, gas components region in the furnace. The result of simulation is intensively processed from multi-section by means of complied data processing program for processing better analysis. And the temperature distribution of furnace surface derived from this is analyzed, and compared to the deformation temperature DT of ash in order to receive the possible place that the contamination occurs in the furnace. Then the temperature of fouling layer is compared with the softening temperature ST of ash, combining with the species region of this part so that whether slag or not can be judged. In the meantime, through the safety analysis on the heating surface of furnace, so stability and safety of water wall of the large capacity boiler using the spiral and the vertical tube coil at the bottom of furnace is making the reasonable judgment, based on which compare the comprehensive safety of heating surface of burning two different coals. At last for question to analysis result, the corresponding measures are proposed for practical and referenced values of design of the large capacity boiler, such as preventing furnace slagging, reducing boiler accident, and improving boiler efficiency.