There are many sources of nitrogen oxides, in which glass furnace flue gas is the main one. The mass of nitrogen oxides in the glass furnace flue gas emissions is up to 14 million tons per year. Furthermore, with the advance of modernization, the consumption of housing and car growing; plus the new growth point of solar glass industry, all these resulting in increasing demand for glass, glass industry continues to develop, thus nitrogen oxide emissions rise.

 

Glass furnace is the indispensable melting Equipment of the glass manufacturing industry. Many processes of glass production including the furnace, the flame and oxygen-enriched furnace, ect., however their production processes require high temperature environment. A large number of nitrates, sulfate, silicate and other compounds used as the glass raw materials, so large amounts of nitrogen oxides, sulfur oxides and dust will generate in high-temperature production process. So the denitrification, desulfurization project is necessary.

 

Ammonia-selective catalytic reduction (SCR) is accepted as the most widely applied, mature, effective of flue gas denitrification technology. It can also apply to the glass furnace flue gas denitration project. The core of SCR denitration process is the denitration catalyst, which usually takes titanium dioxide as the carrier, vanadium pentoxide and tungsten trioxide (or molybdenum trioxide) as the main active ingredients, and with other additives.

 

Tungsten trioxide SCR denitration catalyst used in glass furnace flue gas denitrification mainly consists of two processes: acid-base catalysis and redox. Starting from ammonia absorbed, and then generates "activated" ammonia on the catalyst surface by oxidation and reduction; then the "activation" ammonia will react with vapor or NO which slightly adsorbed to produce non-toxic of nitrogen and water vapor, then discharged into the air, thus complete the cycle of catalytic denitrification.