After the temperature of the molten glass is increased, the melting speed can be accelerated, the melting time can be shortened, and the output is increased and the unit consumption is reduced. Eliminate the "cold air" film near the liquid level. Pay attention to the height of the bottom of the small furnace from the liquid surface and the angle of flame spraying. It is also possible to consider the use of oxygen blowing to boost the method (after blowing in oxygen at a speed of 195-500 m/s abroad, the heat transfer rate is accelerated, and the flame temperature near the liquid level is increased by about 100 ℃). The molten glass selectively absorbs radiant energy. Wavelengths less than 3 microns can pass through the liquid surface downward. It is the carbon particles in the flame and the inner wall surface of the kiln space that can emit radiant energy with a wavelength of less than 3 microns. Therefore, increase the blackness of the flame (by hypoxia heat medium or carbon increase measures) and maintain a high blackness value of the kiln masonry (related to the roughness and temperature of the masonry surface. The blackness of clay bricks and silica bricks at high temperatures Degree value: 0.61-0.62 at 1000°C, 0.52-0.53 at 1200°C, 0.47-0.49 at 1400°C. The blackness value of fused refractory bricks at high temperature is 0. 4-0. 5) It can increase the radiant heat of the flame space to the molten glass.
It is difficult to maintain the uniformity of the mixed materials after entering the kiln, resulting in uneven composition. The heat permeability of the molten glass and the heat dissipation from the kiln to the surroundings caused uneven temperature. Relying on natural diffusion alone for homogenization is obviously unsatisfactory. For this reason, mandatory homogenization measures must be taken. The current effective measures are: low bubbling in the pool (obvious to dark materials), mixing of the forehearth, discharge of the working material or the bottom of the forehearth (with leakage holes) and electric heating for the forehearth. When adopting stirring measures, pay attention to the insertion depth of the stirrer at the stirring point and the stirring process, otherwise the desired effect will not be obtained. From the viewpoint of increasing the temperature of the glass liquid in the clarification zone, reducing backflow and selecting high-quality glass liquid into the liquid hole. In this way, the output and quality of the molten glass can be improved and the loss of the refluxed molten glass can be reduced. The measures taken to realize the above point of view are: set a short and wide kiln to reduce the sinking liquid hole below the clarification tank (the dark material can not sink when melting).
We have taken many energy-saving measures in the construction of glass furnaces, glass materials, feeding system, combustion system, furnace structure, furnace body insulation, waste heat utilization, operation control, etc., and achieved great results. The fuel consumption indicators of many plants have dropped significantly. Some factories have reached the level of first-class or special-class furnaces. But compared with foreign countries, there is still a big gap. . So we have to work hard to further reduce energy consumption.
