--- Check the boiler SO2 emission, control the feeding speed of limestone manually or automatically, make sure that the SO2 emission should be comply with the local regulations. The SO2 emission is not allowed to be 75% lower than the standard for a long time, because it can lead to the boiler operate with low efficiency.
--- The NOx emission in the flue gas could be controlled by adjusting the bed temperature. If the bed temperature is higher than 940℃, NOx content would be obviously high. It should be adjusted by changing the ratio between the primary air and the secondary air and the ratio between the secondary airs, or adjusting the excessive air coefficient. When the bed temperature is within 820~900℃, the NOx emission would be the lowest.