The conventional hot repair methods for glass melting furnaces mainly include the following points:
(1) Hot repair of pool wall bricks
After the pool wall is built vertically with molten cast 41# AZS bricks, it can meet the service life requirements of the melting furnace. The amount of hot repair work is very small. The two methods that may be used at present are as follows. ① Cooling water pipe method. Select a seamless steel pipe with a diameter of 20~50mm and immerse it along the eroded wall into the furnace 50-80mm below the inner liquid surface to solidify the nearby glass liquid. The outlet water temperature is maintained at about 50℃. Although the effect of this method is significant, it increases heat and water consumption, and can only be used on the upper part of the pool wall. It is difficult to be effective when most of the entire brick is eroded and thin.
② External iron brick method. When the pool wall brick is eroded to only 30mm thick, a 150mmS homogeneous brick (also called iron brick) can be attached to the outside. Old bricks can be used for external tiles, and they must be preheated to about 80℃. The contact surface between bricks should be as flat as possible and the brick joints should be small.
(2) Thermal repair of heat storage chamber lattice bricks
Due to the selection of magnesium-chrome bricks, magnesium bricks, high-quality high-purity zirconium corundum bricks, etc. with strong alkali corrosion resistance, the heat storage chamber lattice bricks can be used for one kiln period. At present, the main problem of the heat storage chamber is the blockage of the lattice body after the powder is melted into nodules. The main content of the thermal repair of the heat storage chamber is to keep the lattice body unobstructed. The methods for removing the powder nodules in the heat storage chamber mainly use mechanical removal method, flame melting removal method (reverse burning method), etc.
(3) Thermal repair of nozzle bricks
Nozzle bricks are a special-shaped brick used in oil-fired melting furnaces. They are the channels for the spray gun to eject atomized heavy oil into the kiln and mix with the combustion-supporting air. Since the nozzle brick is located at the nozzle position, it is directly in contact with the flame and is easily burned: when the nozzle of the nozzle brick is burned into a gap, it should be replaced. The replacement method is relatively simple, that is, first remove the spray gun, open the small gap above the nozzle brick, remove the old nozzle brick, replace the new nozzle brick that is preheated (placed next to the small furnace for baking) or heated to more than 900℃ according to the use of the brick material, put it in the original position, smooth the gap, install the spray gun, and restore its action, and the hot repair is completed.
The traditional hot repair method has a harsh environment and high labor intensity. The use of advanced refractory materials has reduced a lot, but it is still a relatively arduous and heavy work, which interferes with normal production. The current hot repair and hot oxygen spraying can improve the conditions for hot repair, which is safer for personnel and equipment, and is being promoted and adopted.
Hot repair is suitable for the reinforcement of refractory materials that have been damaged in the late stage of the melting furnace, or blocking holes, etc., which may pollute the glass liquid and affect the normal operation of the melting furnace. The hot oxygen spraying method is a method of repairing refractory materials by spraying similar refractory powder to the refractory material to be repaired, so that it can be self-melted and welded at high temperature. The hot oxygen method can quickly and safely perform hot repairs on refractory materials. It is very effective not only for ordinary eroded and worn refractory materials, but also for displaced or occasionally broken refractory materials, and even for caulking or plugging holes that cannot be accessed by traditional hot repair methods. This method helps to improve the operating efficiency of the melting furnace.
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