Exam Question

Selective catalytic Reactors (SCR) are being extensively used in marine diesel engines for the compliance of Tier-III NOx emission requirements. Explain various types of SCR's in use wrt to the following: (16)

(a) High pressure SCRs (HPSCR) Vs SCRs with static mixers.

(b) Low Pressure SCRs (LPSCR)

(c) SCR's installed upstream of the turbocharger(s) vs downstream of the turbochargers