Horizontal Refining Furnace Melting Furnace Charge The Side Blowing Numerical Simulation Study

Immersion bath side-blown technology is widely used in the field of the non-ferrous metals and steel smelting.The side-blown furnace melt,flow or mixed flow of fluid behavior, temperature and pressure field studying,which has important guiding significance to the blowing furnace structural design and the technological conditions optimization of side-blown process.The NGL stove is the large-scale submerged side-blown copper refining furnace,which is independently researched and designed by Ruilin Engineering Technology Co.,Ltd. China.In this study,the simulation research work is carried out in view of 250 tons of NGL premixed combustion melting work,oxidation reduction side-blown work process with the FLUENT 6.3 simulation platform,providing the basis and guidance for further optimization design of the NGL furnace .The numerical simulation to the oxidation reduction side-blown process is carried on with Eulerian multiphase flow model,RNG k-εturbulence model and energy model in this study. Under the unsteady state way,the numerical simulation computation to the premixed combustion melting process has been carried on with Premixed combustion model,RNG k ?εturbulence model, energy model and P1 radiation model.By analyzing the numerical simulation results,we draw the following main conclusions:1)Under the conditions of the side-blown total gas flow 1500Nm3/h, the airflow has weak penetration to the melt (Cu). The air current rapidly turns around near the outlet, forming approximately for the vertical upward flow unit, the mixed-stream peak height of about 0.38m . The volume fraction of melt in the stream increases gradually along the stream center, with it deviating from the stream zone, then decreases rapidly. This indicates that the gas - liquid mutual contact and chemical reactions mainly occur in the stream area (above the outlet area);2)After side-blown 8-9s,the flow field basicly full developed,stream cyclical swinging around,melt surface cyclical ups and downs of small waves;3)NGL furnace melt flows well. The big whirlpool shaping on the tuyere area furnace body radial section, the melt upper (near surface) flows to deviate from the direction of outlet, the melt lower accelerately flows to outlet area, the minimum flow rate is approximately above 0.01m/s.Both ends of the melt furnace also has the trend of mobility to outlet area and the speed also above 0.01m/s.4)In the conditions of maximum fuel consumption and maximum load conditions, melting operation takes about 11-12h, at this moment, the minimum melt temperature is 1336k, the maximum melt temperature is 1608k, the temperature is1445k at the flue gas exit.5)Furnace gas temperature along the gas nozzle to the gas export decreased; at the path of the furnace trail, the gas temperature decreased from the center to the lower. The maximum melt temperature is located below flame zone, the minimum melt temperature is located at the flue gas exit.6)NGL furnace wall temperature is between 375 and 415k, furnace bottom is slightly lower than the upper, both of the furnace corners are less than 375k.