Answer: To keep the oil heated up as well as prevent heat loss from the steam.
Why in the condenser hot medium is outside and in the heater hot medium is inside?
- In the condenser hot medium is outside to assist heat radiation
- In the heater hot medium is kept inside to prevent heat loss
Why nox in the steam atomization burner is low while pressure atomization burner is high?
Answer:
- High oil pressure and high oil temperature in the pressure atomization burner produce high NOx
- But in steam atomization burner, high oil pressure and high oil temperature produce low NOx this is because of the steam which absorb some of the heat produced.
PA = Pressure Atomising (KBO)
RC = Rotary Cup (KB, Aalborg make)
SA = Steam Atomising (KBSA, KBSD, Aalborg make)
How would you relate boiler combustion to MARPOL Annex VI regulations?
Answer:
- The NOx Technical Code applies only to diesel engines and does not apply to boiler combustion
- However, Regulation 14 applies. The sulphur content when in ECA area has to be limited to 0.1% and from 1st January 2020, the global Sulphur limit is 0.5%
- Continuous emission of black smoke is prohibited