Numerical Simulation Of Steam Flowing And Heat Transferring In Waste-heat Boiler Of Bottom-blown Smelting Furnace

In the industry production process, there is a lot of waste heat unused. At the same time, contaminating the environment. It is of great importance to recover the heat by the bottom blowing furnace waste heat boiler. This paper simplifies practical matters, by the means that starting with the real project along with the theoretical knowledge and some research methods in the related fields. Making numerical calculation for the boiler by the CFD. Doing some researches about the boiler as the following.Modeling the boiler based on the results of the international and domestic academics to determine the boundary conditions and the physical property parameter of the exhaust gas. Choosing reasonable model that Realizable k-ε turbulence and Do radiation. Making numerical calculation for heat transfer and flow in the boiler by the CFD. Then confirming if the models are reasonable and accuracy.When the air-leakage happens from the furnace mouth of the HRSG, not only will the fume temperature drop, but the performance of heat exchange will improve. Getting the physical property parameter of the mixed gas by the formula of heat transfer. Making numerical calculation for the air-leakage by the turbulence and radiation models as before. Analyzing how the air-leakage impact the evaporation and the outlet temperature of HRSG. Because of the different point of the air-leakage, making numerical calculation for them by the component transport models in the CFD and verifying it. Therefore, how the air-leakage of the different point affect it.When the slag formation happens, it will be of great impact on the security and economy of the HRSG. Analyzing how and why the slag formation happens in the HRSG, and comparing the applicability of different soot particle adhesion degree calculation model. Assuming the speed and temperature of the soot particle is the same to the exhaust gas. Getting the collision frequency of each region in the HRSG by CFD, thus we can get the slag frequency of each region in the HRSG. Writing UDF, then how convection bank wall temperature and the thickness of the ash change over time. Analyzing how the air-leakage impact the collision frequency and the collision frequency of HRSG by CFD, based on the physical property parameter of the mixed gas.When the exhaust gas at a high temperature and a high speed comes into the radiation room, it will cause gathering compactness dust on the ceiling and convection bank is heated unevenly. Making optimal designs on the radiation room of the HRSG by CFD, and analyzing how the size and the position of the flapper in the radiation room affect the HRSG. Therefore, the flow field of the exhaust gas flows is rational in the HRSG, so it is easy for the soot particles to fall.