Reverberatory Furnace Fuel Atomization Combustion Cfd Numerical Simulation Study

At present, China's copper resource is scarce,38% of copper smelting raw materials from domestic,62% came from imports, but the increase of copper consumption is huge in China, the growth rate of refined copper consumption as high as 14.3% from 2001 to 2008, so use the idea of recycling economy, recovering all kinds of scrap copper, generateing secondary copper, which is the effective measure for reducing the cost of copper generation and energy saving emission reduction. Copper refining reverberatory furnace is a key equipment of making secondary copper through pyrometallurgy, the reverberatory furnace has the advantages of large furnace volume, heating fast, slag removal easily, etc., however, it has the disadvantage of low thermal efficiency (generally only 15%-30%) and seriously thermal losses.Therefore, it has great potential for energy conservation.Fuel combustion temperature in reverberatory furnace is the most important factor which determine the furnace's productivity, under the condition of guaranteeing processing technique, the higher the temperature of fuel combustion, the more heat the burden material absorb in the unit time, and the faster the melting rate, so the higher the productivity of the furnace. Therefore, it important to take reasonable measures which can make the combustion equipment meets both the design of performance index and safe operation.Numerical simulation of combustion process has become an important means of aided design, optimal operation and fault diagnose of industrial furnace. In this paper, object of study is a copper refining reverberatory furnace in some copper smeltery, the CFD software FLUENT has been used for caculation to carry on the numerical computation, k-εturbulent flow double-equation model, PDF combustion model, P-1 radiative heat transfer model, thermal NO generation model, eta., have been used for the two-demension and three-demension steady state calculation of fuel atomizer combustion.During the two-demension calculation, The changing law of temperature field, velocity field and concentration distribution of thermal NO are vary with the fuel jet velocity, air preheat temperature and fuel preheat temperature. The paper gives the quantitative analysis of the changing law. On the basis of the two-demension calculation and the actual furnace, three-dimensional modeling and optimization of the furnace have been carried out, the changing law of temperature field, velocity field and concentration distribution of thermal NO are vary with the in the nozzle position, jet spray angle, nozzle angle of inclination, oxygen concentration and gravity factor. The paper gives the quantitative analysis of the changing law. Then, multiphase flow model was used to implement the simple flow of furnace hearth and heat transport numerical simulation. In the last place, the instability of combustion has been verified and analyzed using nonlinear dynamics chaos theory.The above work will help to explore the various factors on the combustion process, the basic laws of the combustion and mechanism can be further understand, which has important significance for improving the combustion model. So that it can provide a theoretical calculation basis for the design and optimization of a reverberatory furnace. It's forming the foundation for the system energy-saving.