According to the reports, a petrochemical company in China has used the tungsten trioxide contained of FN-2G denitration catalyst, up to now, the coal-fired boiler denitration device has been continually run stable for more than two years, with its nitrogen oxides (NOx) removal rate of more than 90%, and the ammonia escape concentration of less than 2 milligrams per cubic meter. It is reported that three of the 220 t / h coal-fired boilers in the company have used this coal-fired boiler flue gas denitrification technology, and the lowest solid tungsten carbide rods concentration of nitrogen oxides in the flue gas can achieve to 20mg/m3 after purification, which meets the national and local pollutant emission standards. According to statistics, after this project carried out, the nitrogen oxide emissions would be reduced by about 2867 tons, which effectively improves surrounding air quality of the company and plays a good social benefit.

 Since China has been increasingly strict on the environmental regulations and included the coal-fired boiler emission standards in the environmental binding targets, the handling environmental protection issue of coal-fired boiler flue gas has gotten a lot of attention. According to the status quo of the boiler flue gas properties in China, researchers have proposed a low NOx combustion air staging and selective catalytic reduction flue gas denitrification combined process technology solutions, and they also have developed a selective catalytic reduction of coal-fired boiler flue gas denitrification (SCR) technology, boilers selective catalytic reduction reactor flue gas, ammonia injection components and other key equipment and a series of advanced technology and equipment. In addition, the researchers have developed the FN-2G denitration catalyst, which takes nano titanium dioxide as the carrier, vanadium pentoxide, tungsten trioxide and other metal oxides as an active ingredients, through analyzing the composition of the pollutants in the coal-fired boiler flue gas. Nitrogen oxide is one of the major air pollutants, large amounts of NOx emit directly into the air will cause an acid rain, etc., and bring a large pressure to the environment, also do some tungsten carbide weight damages to the human body, and animals. Currently, the widespread use of mature technology is the SCR technology, in which tungsten trioxide denitration catalyst is suggested to be the core, and translate NOx into nitrogen and water under the presence of ammonia, thus to achieve NOx removing.