Process for making technical glass and burner for carrying out said method

摘要

A process is claimed for the fabrication of technical glass with the aid of a non-hard flame, blue in colour within an emission spectrum of between 2 mu m and 5 mu m and essentially free from reducing specie. The burner (1) used in this process is also claimed, incorporating three coaxial channels (3, 5, 7) feeding gas into a combustion zone (9), that is to say a central channel (3) feeding a combustive agent, an intermediate annular channel (5) feeding a fuel and a peripheral annular channel (7) feeding a combustive agent. The total flow rate of the combustive agent (Qo) is determined by the following relationship:- Qo = (R<0> = DELTA R) Qc where Qc represents the nominal consumption of fuel by the burner, R<0> is the stoichiometric ratio between the fuel and the combustive agent and R is a stoichiometric excess. The dimensions of the three channels (3, 5, 7) satisfy particular conditions to produce a blue flame with a reduced quantity of movement in accordance with some given relationships.