For a long time, glass furnaces have used air as the combustion-supporting gas, and the use of air as the combustion-supporting gas is the main cause of high pollution and high energy consumption.
Because the oxygen content in the air is only 21%, the remaining 78% of nitrogen is inefficiently heated during the glass melting process and discharged into the atmosphere at high temperature. In order to solve the problems caused by air combustion, full oxygen combustion technology has gradually been promoted around the world.
What is oxy-fuel combustion technology?
The so-called full oxygen combustion technology refers to a furnace that uses pure oxygen instead of air as the combustion-supporting gas.
Air combustion: CH4 + 2O2 + 7.5 N2 → CO2 + 2H2O + 7.5 N2
Full oxygen combustion: CH4 + 2O2 → CO2 + 2H2O
Glass furnaces using full oxygen combustion technology emit less exhaust gas and take away less heat;
the combustion is complete, there is no port and regenerator in the furnace structure, so the heat dissipation to the outside is less, and the energy saving effect is obvious. It usually saves 15~25% energy compared with air combustion.
The water vapor content in the combustion products of full oxygen combustion is higher than that of air combustion. The increase in water vapor content causes a series of changes in the glass melting furnace, which accelerates the erosion of refractory materials in the glass furnace.
This article takes fused cast AZS blocks as an example to compare the erosion process of fused cast AZS blocks in air combustion furnaces and analyzes the mechanism of accelerated erosion.