Abstract
To cut metals, the oxycut process uses a preheating flame, usually composed of oxygen and a combustible gas, in addition to a flame-independent jet of oxygen. In the present work, the partially premixed combustion model of a finite volume-based software was applied to analyze the flame temperature in a cutting tip of acetylene. At the torch inlet boundary, the flow rates of oxygen and acetylene were adjusted to sweep a wide range of fuel-oxygen ratio. The results pointed a peak surrounding the stoichiometric ratio, at 3106 °C for the literature and 2650.93 °C for the numerical model, contrasting a deviation of 14.65%. The maximum temperature occurs at 52.38% of oxygen volume for the literature and 50.03% for the model, a difference of 2.35 percentage points only. It is concluded that the results of the numerical approach attained the ends of the research.
Highlights
IntroductionThe oxyfuel gas cutting uses a pure jet of oxygen to oxidate the base metal and to remove the mixture of oxides and the material to be cut from the fissured region (Marques et al., 2011)
Oxycut is a thermal and chemical cutting process, frequently performed to cut carbon and low alloy steel, faster and cheaper than any mechanical mean (Machado, 1996).Oxycut main advantages are its relatively simple configuration, directly associated to expenses, alongside with the chemical source of most of the amount of energy required by the process:a reaction between oxygen and a combustible gas.The oxyfuel gas cutting uses a pure jet of oxygen to oxidate the base metal and to remove the mixture of oxides and the material to be cut from the fissured region (Marques et al., 2011)
The oxyfuel gas cutting uses a pure jet of oxygen to oxidate the base metal and to remove the mixture of oxides and the material to be cut from the fissured region (Marques et al, 2011)
Summary
The oxyfuel gas cutting uses a pure jet of oxygen to oxidate the base metal and to remove the mixture of oxides and the material to be cut from the fissured region (Marques et al., 2011). Cut quality is connected to, among many properties, the gases flow rates (Marques et al, 2011), as well as the temperature reached by the process (Marques et al, 2011; Ramalho, 2008). Studies such as the one developed by Carlos (2008) evidence the attractiveness of Liquefied Petroleum Gas (LPG) for oxyfuel gas cutting, acetylene is still the most widely fuel gas employed. The investigation of acetylene oxidation is beyond welding and cutting applications, because it takes place during the combustion of larger hydrocarbon fuels and plays a major role in the growth of soot particles in fuel rich flames (Murray et al, 1992)
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