Structure Optimization And Numerical Simulation Of Flow And Temperature Fields In The Radiation Chamber Of Waste-Heat Boiler For Copper Flash Smelting

The gas flow, heat transfer and mass transfer process in the radiation chamber of waste-heat boiler for cooper flash smelting were quite complicated. It was of significance to accurately master the flow and temperature fields in the radiation chamber for the optimization design of the product. In this article, the structure optimization and numerical simulation of flow and temperature fields in the radiation chamber according to a waste-heat boiler for cooper flash smelting was researched by CFD technology. The main tasks and conclusions of this paper are as follows:1) The numerical simulation theory of flow and temperature fields was studied. Turbulence flow, diffusion of chemical components, and heat transfer were the 3 main factors affecting flow and temperature fields. The 3 main factors interacted and were considered in the process of building the mathematical model.2) The physical model of radiation chamber was built by studying the structure characteristics of waste-heat boiler for cooper flash smelting. The general distribution rules of the flow and temperature fields in the radiation chamber with the air for sulfation injecting were generated after the boundary condition was determined. Then 2 optimization methods were established:optimizing the position of air for sulfation nozzles by moving upward the nozzles; optimizing the length and position of the baffle-board by reducing the length of the baffle-board and moving baffle-board toward the entrance of gas.3) The readjustment designs were studied by structural optimal method. First, the 3 air for sulfation nozzles were moved upward. Second, the 2 optimization methods of reducing the length of baffle-board and moving baffle-board toward the entrance of gas were taken as 2 irrelative design variables. Then the objective function and feasible region were established. The feasible region was divided into some sub-ranges and the representative cases were analyzed to find out the better case. Last, a case with readjusting the crack width of baffle-board was simulated to master the influencing law of flow and temperature fields by increasing the crack width.