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 SCRs in use with particular focus on the following:

(a) High Pressure SCRs (HPSCR) vs Low Pressure SCRs (LPSCR)

(b) SCRs with static mixers.

(c) SCRs installed upstream the turbocharger(s) vs downstream turbochargers.