| abstract |
The after-treatment system device of the present invention and control method include: exhaustor, and its one end is connected with electromotor, enter for waste gas, and the other end is open, discharge for described waste gas；DOC, it is for once reducing the coal smoke of the waste gas entering described exhaustor；DPF, it reduces the coal smoke of the waste gas having passed through described DOC for secondary；SCR, it is for reducing the NOx (nitrogen oxides) of the waste gas having passed through described DPF；AOC, it, for aoxidizing the ammonia of the waste gas having passed through described SCR, reduces NOx (nitrogen oxides)；First bypass pipe, it is from the exhaustor difference between described electromotor and DOC, and all or part of making waste gas travels back across described SCR front end；And first switch, it is provided to from described exhaustor to the position of described first bypass pipe difference for controlling to travel back across the amount of waste gas of described first bypass pipe. |