Whenever operating a boiler, whose...

🔍 Key Concepts

• Boiler economizer function – what does an economizer normally do with exhaust gas heat? • Fuel consumption vs. heat recovery – what happens to fuel use when you throw away recoverable heat? • Effects of bypassing – what risks or changes apply ONLY when the economizer is in service, and which are reduced when it’s bypassed?

💭 Think About

• First, think about the main purpose of an economizer in a boiler system. If you bypass it, what happens to feedwater temperature and overall efficiency? • Consider which of the options would be directly affected by taking the economizer OUT of the gas path. Would metal oxidation risk in the economizer increase, decrease, or stay the same when it’s bypassed? • Look at each choice: is it a consequence of bypassing the economizer, or is it something that would be more of a concern when the economizer is actually in use?

✅ Before You Answer

• Verify which statement(s) directly follow from losing waste heat recovery when the economizer is bypassed. • Check whether concerns about metal oxidation in the economizer make more sense when hot gas is flowing through it or when it’s bypassed and cooler. • Make sure any ‘all of the above’ choice only fits if every single individual statement would logically be true when the economizer is bypassed.

Whenever operating a boiler, whose economizer is bypassed, always keep in mind that __________.

it is necessary to fire more fuel to maintain the required evaporative rating

there is always the danger of metal oxidation in the economizer

less heat is actually being transferred to the steam because of the decrease in the ratio of gas to steam weight

all of the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer