Boiler tilting
Thread Content
The 120,000 tons/year boiling furnace in our plant was built and put into operation in 1995. Starting in 1997, the furnace began to tilt downward; during the major maintenance in 2006, the vertical deviation of the furnace was measured, which was 26 cm. Starting from February 12, 2008, the tilting of the furnace body toward the south increased steadily; now the furnace body is resting against the loading dock transportation frame. The steel plate at the northern exit of the furnace has been burned through, and the feeding port has been distorted due to pressure. What are the reasons that affect the tilting of a boiling furnace? Recently, we have switched to using pyrrhotite and high-sulfur ferrohematite as fuel, which has caused the temperature at the upper part of the furnace to rise, reaching up to 1000°C. I’m not sure if this will have an impact on the furnace itself Is there any solution? This post was last edited by bikle on 2008-3-10 15:24]
The exit is on the north side; the inlet should be on the south side, right? The inlet is supposed to be located in the feeding building – how could it be part of a pier-based transportation framework?
Yes, it’s right against the factory building!
This is the first time I’ve heard of such an accident; the topic raised by the original poster is indeed novel. I hope that experts will offer more practical and effective suggestions. If the original poster has already resolved it, please be sure to share it with everyone.
No good solution has been found yet; for now, the broken refractory bricks have been repaired, and 8 support frames have been installed around to prevent collapse! They are all temporary measures!
I think the main problem is that the quality of the refractory bricks is not up to standard. We are also using magnetite and high-sulfur, high-iron ore for firing, with a furnace top temperature of up to 1050 degrees – and that’s no problem
:) Agree with what was said above. There is a certain safety distance for the tilting movement of the furnace body. But you said that the brick wall inside the furnace has fallen off, which should be related to the process temperature. If the thermometer reads accurately, the outlet temperature can be lowered slightly for a while before measuring the inclination and making a comparison. If temporary reinforcement is required, it is necessary to engage a professional reinforcement company to carry out the work, and an emergency response plan must be established. Safety first
Foreign countries have leaning towers; your factory has leaning furnaces that have been in use for over a decade – you might consider rebuilding them.
A plan to rebuild exists, but that will also take time. Anyway, we have to get through this year somehow!
I really want to know the answer to this question
Only God knows what to do in such a situation
I think the problem lies in the installation and construction of the furnace; specifically, whether the verticality and roundness of the furnace’s outer shell meet the required standards. It also depends on whether there are any issues with the refractory bricks used for lining it. What is the size of the furnace, and what type of steel plates are used? Additionally, it’s important to check whether there are any problems with the furnace’s foundation as well.
Please reinforce the company’s corrections; we have already fixed the tilting issue in our company caused by the earthquake!
It is very likely that this was caused by prolonged backflow of smoke; the continuous backflow of smoke at the furnace opening led to sulfide cracking of the steel plate on the feed port side, causing it to lose sufficient strength for support and thus tilt in that direction. The solution is first to prevent smoke from flowing back from the cigarette outlet, by using normal operation with a slight negative pressure ； Secondly, the damaged shell needs to be reinforced through additional welding. It should be noted that due to sulfidation corrosion, the steel loses much of its weldability; it is difficult to weld in such conditions, and even if welding does take place, the resulting structure does not have much strength. Therefore, it is necessary to create a larger piece of material to cover this area and weld it there, with an area that is larger than the part that has been affected by sulfidation (extending to the areas where the steel quality is better) ； Third, repair the internal refractory bricks. When carrying out the repairs, it should be noted that the retaining rings of the layer are likely to have been damaged; it is best to fix them before construction ； Fourth, it is to provide existing support and pay attention to monitoring.
Strongly support it; in addition, emergency response plans and monitoring systems should be established!