The peeling of boiler refractory associated...

Question 1 / 270705eccefa0bacbc34ba4d46cee

Question 1 of 270705eccefa0bacbc34ba4d46cee

The peeling of boiler refractory associated with slagging, is caused by the __________.

Question 1 of 27070

The peeling of boiler refractory associated with slagging, is caused by the __________.

🔍 Key Concepts

• slagging and how slag forms/coats refractory surfaces in boilers • thermal expansion behavior of firebrick vs. slag coating under heating and cooling • mechanical vs. chemical causes of spalling/peeling in refractories

💭 Think About

• Think about what happens when two different materials that are bonded together are heated and cooled at different rates or to different temperatures. • Consider whether slag usually attacks the brick chemically first, or whether physical stresses are more commonly responsible for peeling off a surface layer. • Ask yourself which option best explains a thin layer of refractory lifting or flaking away from the backing brickwork right where slag has formed.

✅ Before You Answer

• Identify which choices describe a mechanical/thermal stress effect and which describe a chemical effect. • Consider which option directly involves both slag and refractory/firebrick changing size differently as temperature changes. • Eliminate any choice that does not clearly connect the peeling with the presence of a slag coating on the refractory surface.

Question 1 of 27070

The peeling of boiler refractory associated with slagging, is caused by the __________.

shrinkage of brickwork adjacent to slag coated refractory

chemical action of the slag on the firebrick surface

difference in the rate of expansion between the firebrick and slag coating

uneven heating of the brickwork during boiler warm up

Question 1 / 270705eccefa0bacbc34ba4d46cee

Question 1 of 270705eccefa0bacbc34ba4d46cee

The peeling of boiler refractory associated with slagging, is caused by the __________.

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Question 1 of 27070

The peeling of boiler refractory associated with slagging, is caused by the __________.