Different heat transfer rates, flame shapes, etc. for premixed & post-mixed oxy-hydrogen & oxy-methane flames result in differences between flames. Heat transfer rates from premixed oxy-hydrogen flames are approx. six times higher than those from premixed oxy-methane flames. The heat transfer rates from premixed flames are around 30% higher in the case of oxy-methane flames & about two times higher for oxy-hydrogen flames than in post-mixed flames. The heat transfer profile in radial distance of oxy-hydrogen flames is smaller than for oxy-methane flames. This means that premixing glass treatment technologies are more efficient than post-mixing technologies and glass treatment technologies with hydrogen/oxygen are more efficient than natural gas/oxygen or propane/oxygen. Premix technology with oxygen/hydrogen gives the best results.
