Issues with the furnace wall sealing?

Did you not conduct a leak test before? Generally, a positive pressure test is used to check the tightness of the boiler itself and its flues. At present, you can adjust the capacity of the supply fan; or you can reduce the thickness of the material layer or increase the capacity of the exhaust fan

Would it be difficult to repair the wall? Could some expert advise on how to fix it?:)

Wasn’t a wind pressure test conducted when the boiler was first built? If it’s the exterior wall sealing box that isn’t properly welded, it’s easy to fix – just find the leaky spot and weld it. But if there are areas in the furnace wall itself that aren’t properly welded, that becomes more problematic. It’s best to have a comprehensive inspection; otherwise, if the lining is emptied and overheating occurs, it will cause problems.

The main reasons for air leakage in our furnace walls are poor furnace construction techniques and excessively high heating temperatures. Now, large cracks have appeared on the furnace wall as well as at the points where the header contacts the furnace wall, and ash is continuously coming out. Everyone, please help me think of more ideas! !

According to what you said, is it the top header or the bottom header of the furnace? Such severe ash leakage may occur at the bottom; it could be due to inadequate consideration for expansion during the construction of the furnace lining. In such cases, the metal furnace walls will crack after operating for some time. But it’s also possible that there were welding defects during installation. Nowadays, many new power plants skip the step of applying wind pressure resistance; once welding cracks occur in such cases, and since the seals are not proper, air from the outside can get in, creating a large pressure difference. Even if the refractory materials are installed properly, ash leakage can still occur. There isn’t a particularly good solution; if the crack is not complex and does not involve other issues, one can try welding a sealing box at the location of the crack and filling it with refractory lining material. But this can only hold up for a while. Moreover, after sealing with this method, it is easy to cause overheating and red-hot conditions at the sealing location and its surroundings. Because the refractory material has been made very loose during ash scattering here, it can no longer serve the purpose of sealing and insulating; after sealing, local heat accumulation is likely to occur, leading to redening and overheating. Careful selection of the refractory material construction team is necessary. It’s best to arrange the repair as soon as possible.

To find out where the leak is, it can be filled with asbestos rope and then sealed with fire-resistant mortar. Positive pressure cannot be burned at runtime.