| 摘要 |
The present invention relates to an apparatus for decreasing nitrogen oxides and, more specifically, relates to the apparatus to remove nitrogen oxides by selectively supplying urea water, waste water or mixed water thereof in a furnace. The apparatus comprises: a mixing tank to which urine water and waste water are separately supplied and urine water and waste water are mixed therein; a main line connected to the mixing tank to supply urine water, waste water or mixed water thereof in a furnace; a main valve disposed in the main line to open and close a pipe line of the main line; an auxiliary supply line connected to the main line between the main valve and the furnace; a urine water tank and a waste water tank separately connected to the auxiliary supply line wherein urine water and waste water are separately stored to supply through the auxiliary supply line; and a bypass line connected to the main line between the main valve and the mixing tank to introduce and store the urine water and waste water that remain in the main line in the urine water tank and the waste water tank. |
