Ultra low emission means that in the process of power generation, operation and terminal treatment of coal-fired boilers in thermal power plants, the integrated system technology of efficient collaborative removal of multiple pollutants is adopted, so that the emission concentration of air pollutants basically meets the emission limits of gas-fired units, that is, the emission concentration of soot, sulfur dioxide and nitrogen oxides (6% of the base oxygen content) does not exceed 5 mg / m3, 35 mg / m3 and 50 mg / m3 respectively It is 75%, 30% and 50% lower than the special emission limits of coal-fired boilers in key areas specified in the emission standard of air pollutants for thermal power plants (gb13223-2011), which is a new benchmark of clean production level of coal-fired power units.

The requirements of ultra-low emission leak detection are higher than that of ordinary emission, which mainly reflects the differences of phosphor fineness, diffusibility, dosage and operation.

The fineness of ultra-low emission is: narrow normal distribution, D10 > 1um, D50 2-3.6um, D90 < 7um