Emission control

Question 1

What are the primary methods for removing exhaust emissions?

Answer 1

Control injection timing, burn rate shaping, internal EGR, water addition(water-fuel emaluation, inlet air humidification and direct water injection), external EGR.

Question 2

What are the secondary methods for exhaust emission reduction?

Answer 2

Selective catalytic reduction of NOx and exhaust gas scrubbing of SOx and PM

Question 3

What are some non-marine exhaust emission reduction methods?

Answer 3

• Diesel particulate filter
• Lean NOx trap

Question 4

What is the primary goal of controlling NOx emissions in-cylinder?

Answer 4

• Reduce flame temperature
• limit oxygen availability

Question 5

What really is Burn rate sharing?

Answer 5

Individually controlled fuel pumps allowing for controlled injection timing, injection duration and fuel injection pressure.
- NB. Also possible to control exhaust/air valve timing for more optimal air supply for different loads.

Question 6

What does EGR do to lower flame temperature?

Answer 6

lower O2 concentration.

Question 7

What are some disadvantages of ERG?

Answer 7

• Increased fuel combustion
• increased corrosion
• increased smoke emissions (what is smoke emission guys?)

Question 8

What is the main goal of adding water to cylinders?

Answer 8

Heat of vaporization is used to decrease the temp inside the cylinder