Stack type air heaters are bypassed when a...

Question 1 / 270705eccefa0bacbc34ba4d46ecc

Question 1 of 270705eccefa0bacbc34ba4d46ecc

Stack type air heaters are bypassed when a vessel is in port in order to prevent __________.

Question 1 of 27070

Stack type air heaters are bypassed when a vessel is in port in order to prevent __________.

🔍 Key Concepts

• Stack (air preheater) operation at sea vs. in port/low load • Effect of flue gas temperature on metal surfaces and condensate formation • Relationship between sulfur in fuel, low gas temperature, and corrosion risk

💭 Think About

• When the vessel is in port, how do boiler firing rate and exhaust gas temperatures usually change compared to full sea speed? • What happens inside a heat exchanger if the hot gas side temperature drops below the dew point of water and acidic compounds in the flue gas? • Which of the choices describes a problem that becomes MORE likely at low load/low gas temperature rather than at high load/high temperature?

✅ Before You Answer

• Identify which option is directly related to low stack temperatures and possible condensation/acid formation. • Check which options would actually be more of a concern at high firing rates (maximum draft and gas flow) instead of in-port, low-load operation. • Verify which issue would cause long-term damage to the air heater surfaces, not just a temporary operational inconvenience.

Question 1 of 27070

Stack type air heaters are bypassed when a vessel is in port in order to prevent __________.

insufficient air supply to the fires due to the pressure drop across the heater

interference with the operation of the soot blowers

corrosion of the heater due to the low stack temperatures

localized heat stressing of air heater surfaces

Question 1 / 270705eccefa0bacbc34ba4d46ecc

Question 1 of 270705eccefa0bacbc34ba4d46ecc

Stack type air heaters are bypassed when a vessel is in port in order to prevent __________.

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Question 1 of 27070

Stack type air heaters are bypassed when a vessel is in port in order to prevent __________.