Gaseous oxygen for use in production of steel, ethylene oxide, part oxidation of fuel, etc. made by evaporating liquid oxygen produced from untreated air

摘要

Gaseous oxygen is produced first making liquid oxygen by liquefying and rectifying untreated air, then compressing the liquid oxygen to a preset pressure and evaporating it by introducing it at that pressure into a heat exchanger. The oxygen gas flows upwards at a linear velocity at least equal to the terminal velocity (u) of a droplet of liquid oxygen having a diameter of 200 micro m where u = ((4g<2>( rho L - pi G)2 Dp<3>)//(225 mu rho G))1/3 g is gravity; pi L and pi G are the density of saturated liquid and saturated gaseous oxygen at the preset pressure; rho is viscosity of the saturated oxygen gas at the preset pressure and DP is droplet diameter. Preferably the linear velocity is at least equal to the terminal velocity of a droplet of 500 micro m or more preferably 1mm where u = ((3.03g<2>( rho L - pi G) Dp<3>)//( rho G))2.