Study On The Process Of Recovery Of Gas In Complex Blowing Converter

Some investigations indicated that the recovery level of converter gas in domestic enterprises is much lower compared with that in developed countries.The specific aspects are as follows:?1?the statistical data of converter gas recovery is not reasonable.The volume quantity of the converter gas recovery volume was generally used as the symbol to evaluate the revovery level without considering the heat volume of the recover gas,which could easily cause the false image of the gas recovery level.?2?The relatively low level of gas recovery will be possibly exposed by using the measurement of real recovery quantity?KJ/t?for converter gas,which involves not only the related technical problems,but also the management level.The main factors that affect gas generation and gas recovery are analyzed based on the generation law of converter gas,thermodynamics and kinetics calculation.The improved means for improving the gas quality are explored by combining specific factors,water simulation and numerical simulation,in this paper the main research contents and conclusions are discussed.As follows.1)The decarburization speed of the molten pool is an internal factor to affect the gas generation.By strengthening the top blowing strength and improving the bottom blowing conditions,the decarburization speed of the molten pool can be accelerated and the gas generation can be increased effectively.Air suction coefficient is the external factor affecting the quality of gas recovery.The calorific value of the gas can effectively control by changing the air suction coefficient during the blowing period.2)The influence of the bottom blowing strength,layout mode and flow distribution ratio on the diffusion mass transfer coefficient in the molten pool was studied by water simulation experiment.The corresponding relationship between the mass transfer coefficient and the flow distribution ratio was revealed.The continuous layout effect is better than the interval layout.With the increase of bottom blowing intensity,the flow distribution ratio of the best mass transfer of the molten pool increases.The mass transfer effect of the motten pool is the best and the mass transfer coefficient is increased by 81.4%under continuous arrangement with the bottom blowing strength at 0.2 Nm³/t·min corresponding to the distribution ratio of bottom blowing flow at 4:1.3)The flow field,temperature field and reaction of flue in blowing process were studied by numerical simulation.The exothermic reaction and reaction products of CO and O₂ and the flow of inhaled nitrogen are mainly occurred inside the flue.The exothermic reaction occurs mainly at the edge of the hood and the bottom wall of the flue.There is a clear wall burning phenomenon.With the increase of air suction coefficient from 0.1 to 0.25,the area of reaction area will increase by more than 30%and the proportion of high reaction area can be increased by 6%⁷%.4)Based on the analysis of industrial data and simulation calculation,the numerical simulation results were analyzed,and the relationship between the CO concentration of gas and the core reaction temperature of flue gas was obtained.With the formula is ???.The calculation formula reveals the delay rule between the stroke frequency modulation and the pool reaction in the gas recovery system.5)The technological idea of spraying coal powder into flue gas and improving the quality of recovered gas was put forward,and an industrial experiment scheme was designed.