Furthermore, the exhaust pipe, the mixer and {TAIL ~ the inlet portion} of {HEAD ~ the de nitrification catalyst reaction device} may be disposed coaxially each other so that gas flow resistance can be reduced 
Furthermore , the exhaust pipe , the mixer and { TAIL ~ the inlet portion } of { HEAD ~ the de nitrification catalyst reaction device } may be disposed coaxially each other so that gas flow resistance can be reduced
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH