There is no so-called polymer in the denitrification agent. In essence, it uses dry urea to denitrify. The principle of denitrification is that dry urea decomposes into isocyanate gas at high temperature, and its reducing properties are better than the ammonia gas generated by the pyrolysis of ammonia water and urea solution. Because water is not used, heat energy consumption is reduced, denitrification efficiency is improved, and corrosion of boilers and furnaces is reduced. These three advantages made the urea particle dry denitrification process once more popular, especially in SCR denitrification. The investment is too large, and the catalyst often Under the problem of poisoning replacement, it can be regarded as a transitional solution.
At the same time, this process is quite controversial internationally. In fact, the use of dry urea for denitrification is not a patented invention of China. Foreigners used it in the 1970s and 1980s, because it was found that this process would produce secondary pollution of nitrous oxide N2O (also called laughing gas), which is much worse than Nitrogen oxide is more likely to cause aerosol transmission and haze pollution. This gas cannot be detected by current online monitoring equipment. Therefore, it can only be said that this denitrification process is a transitional solution, not a panacea that can cure all diseases, nor is it the ultimate solution for denitrification.
In addition, another disadvantage of the so-called polymer denitrification is that the operating cost is relatively high. Especially when the price of urea increases, companies cannot afford the high operating cost.