Advantages of full oxy-combustion technology for liquid crystal glass furnaces
Traditional glass kilns generally use air-assisted combustion heating methods. Air-assisted combustion has many disadvantages, including high energy consumption and high pollution. The oxygen content in the air accounts for about 21%, and the nitrogen content accounts for about 79%. Nitrogen participates in the combustion reaction and is heated to high temperature before being discharged from the kiln, which increases energy consumption. At the same time, nitrogen reacts with oxygen to form NO gas, which is discharged into the kiln. It will cause severe air pollution in the atmosphere. In order to overcome these shortcomings of air-assisted combustion, full oxygen combustion technology using pure oxygen as the combustion-supporting gas has been rapidly developed in the glass industry. Oxygen combustion contains almost no ammonia in the combustion-supporting gas, so the N0 gas formed by the combustion reaction is greatly reduced, significantly reducing air pollution. At the same time, the thermal efficiency of all-X oxygen combustion is higher, which can increase the furnace melting rate. In short, compared with air Combustion-assisted, full-oxygen combustion technology has obvious advantages. The LCD glass furnace uses a mixed heating method that combines electric heating and full oxygen combustion heating to heat the batch materials to melt them into a high-mix glass liquid that meets the requirements.
1. Introduction to oxy-combustion technology for liquid crystal glass furnaces
The kiln in the LCD glass production line heats the batch materials to melt them into high-temperature glass liquid. The high-temperature glass liquid flows to the next process through the glass liquid outlet arranged at the bottom of the kiln. The feeding end uses a screw feeder to transport the batch materials into the kiln from the feeding port on the back wall. The upper part of the kiln uses multiple pairs of oxygen burning guns for counter-position combustion to provide space heat. The fuel is generally natural gas, and the lower part uses electric boosting to further heat the glass liquid. Oxygen burning guns are distributed in pairs on the parapets on both sides of the kiln, and the smoke generated by combustion is discharged from the exhaust port on the rear wall.
2. Advantages of full oxygen combustion in LCD glass furnace
Compared with air-assisted combustion, LCD glass furnaces use full oxygen combustion, which has the following outstanding advantages:
(1) Energy saving and consumption reduction
Natural gas combustion:
Air combustion: CH4+202+7.5N =C0 +2H20+7.5N2
Full oxygen combustion: CH4+202=C02+2H20
When air assists combustion, air serves as a combustion-supporting gas. Oxygen in the air accounts for about 21% and nitrogen accounts for about 79%. The nitrogen content is much higher than the oxygen content. A large amount of nitrogen in the air participates in the combustion reaction and is ineffectively heated to high temperatures. The high-temperature flue gas is discharged from the kiln, thereby taking away a large amount of heat, reducing the thermal efficiency of air combustion and increasing energy consumption. As for full-oxygen combustion, since the combustion-supporting gas is pure oxygen and contains almost no nitrogen, the combustion-supporting gas can all participate in the combustion reaction, and no ammonia is ineffectively heated to take away heat, so the thermal efficiency of full-oxygen combustion is higher and the energy consumption is lower. , conducive to energy saving and consumption reduction.
(2) Reduce air pollution
One of the important measures for controlling NO gas emissions in the glass industry is full oxygen combustion technology using pure oxygen as a combustion-supporting gas. Full oxygen
Combustion can not only save energy and reduce consumption, but also reduce environmental pollution. Using full oxygen combustion, the amount of ammonia entering the kiln is greatly reduced, and the NOx content in the flue gas discharged from the kiln is greatly reduced, which can effectively prevent atmospheric pollution.
(3) Increase melting rate
When using full oxygen combustion, the fuel is burned completely, the flame temperature is high, and the products are mainly CO2 and H20, which are darker than air combustion.
It has strong radiation ability, the flame radiation temperature can be increased by about 100°C, the melting speed of the batch materials is accelerated, and the melting rate can be increased by more than 10%.
Wechat Us 
