Exhaust emissions control

Question 1

What are the primary methods for reducing production of emissions.(exhaust gas cleaning)

Answer 1

– Injection timing – retarded injection
– Burn rate shaping
– Internal exhaust gas recirculation (EGR) – reduce oxygen content
– Water addition – increasing heat capacity
* Water-fuel emulsion (white diesel)
* Inlet air humidification
* Direct water injection
– External EGR – reduce oxygen content

Question 2

What are the secondary methods for emission control(exhaust gas cleaning)

Answer 2

– Selective catalytic reduction (SCR) of NOx – reduction agent is used (urea or ammonia)
– Exhaust gas scrubbing for SOx and PM reduction

Question 3

what are the not primary or secondary methods for emission reduction (NOT MARINE)

Answer 3

– Diesel particulate filter (DPF) – regeneration is needed
– Lean NOx trap (LNT)
-Calatlysator