What causes peeling of the furnace tubes in a heating furnace?
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After being in use for a period of time, the outer surface of the furnace tubes in the newly built atmospheric pressure furnace develops peeling; the furnace temperature is around 750 degrees, the oxygen content is 2–3%, and the material used is Cr5Mo. I’d like to ask everyone what the reason is?
1. Check whether the fuel gas (oil) has a high sulfur content, which may cause sulfur corrosion and peeling. 2. A high water content in the fuel gas (oil) can also cause peeling on the furnace tubes.
This is also a topic that concerns us. Please have experts in this field conduct a thorough analysis. Thank you first. And also, how should such problems be solved? Have heard of sandblasting and chemical cleaning. But I haven’t seen any of them either; those who have dealt with this issue could please provide some guidance.
1. It could be due to an excessive sulfur content in the fuel gas or fuel oil, which leads to sulfur-induced corrosion and peeling. 2. It might be a problem with the crude oil itself; its composition being too heavy results in localized coking inside the furnace tubes, thereby causing local overheating and peeling. 3. As mentioned in point 2, a high water content in the fuel gas or fuel oil can also cause peeling of the furnace tubes. 4. The least likely possibility is that the material and type of the furnace tubes do not match the design specifications, which in turn leads to peeling of the tubes and significantly reduces their service life
Another possibility is that the furnace temperature during operation becomes too high, far exceeding 750 degrees, resulting in oxidation and decarburization due to the high temperature. For example, the absence of a medium in the furnace tube causes it to exceed its limit temperature, leading to decarburization and peeling.
Before the new furnace is put into operation, it is necessary to check whether the casting residue left during the construction of the furnace tubes has been completely removed
Problems with the burning medium; problems with incomplete combustion
Based on the information provided by the poster, if the operational fluctuations are not significant, the issue should be considered from the perspective of the fuel gas. Additionally, it’s important to check whether there is any situation where fire is blowing onto the furnace tubes, causing localized overheating.
Reasons for tube peeling: 1. High sulfur content in the fuel gas (oil), leading to corrosion and peeling. 2. The high water content in the fuel gas (oil) causes peeling on the furnace tubes. 3. Local overheating and coking of the furnace tubes result in peeling on them.
Our reason is the high sulfur content in the fuel gas, which causes sulfur corrosion and peeling
High fuel sulfur content? Is the excess air coefficient too high? The furnace temperature is a bit high!