The function of the glass kiln arch is to form a flame space with the breast wall and the front wall. At the same time, it can also be used as a medium for the flame to radiate heat to the material and the glass liquid, that is, absorb the heat released when the fuel burns, and then radiate it to the glass liquid surface.
The weight of the big ball is transferred from the steel ballast to the steel structure at the bottom of the kiln from the column through the upper slap iron.
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The height and characteristics of the arch can be reflected by the strut-span ratio. From a thermal point of view, it is beneficial to have a lower head, so that the heat can be radiated to the molten glass as much as possible. To reduce the height of the arch, it can be achieved by reducing the height of the parapet and reducing the arch strand. However, the height of the breast wall is restricted by factors such as the crater of the small furnace, and reducing the slats will increase the horizontal thrust of the arch, and the instability of the arch will increase. The large-scale float glass melting furnace generally has a span ratio of about 1:8, the span is 400-500 mm larger than the width of the melting pool, and the thickness is considered as 1/25-1/20 of the span of the arch.
In the length direction of the melting part, the arch can be divided into multiple sections, generally at least three sections. During masonry, the expansion joints reserved between each section are 100 to 120 mm. The expanded dowels at the front and rear arch are generally built with high-quality silica bricks. The shape of the silica bricks is wedge-shaped, and the transverse joints are staggered. The size of the mud joint can be determined according to the specific requirements of the masonry mud used, generally 1 to 2 mm.
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The arch ballast of the float glass melting furnace is mostly steel ballast, and it is required to be cooled by air blowing. Moreover, the extension line of the inclined plane of the steel ballast on both sides needs to pass through the center of the arch, and the angle formed is the central angle of the arch.
The lifespan of the kiln arch determines the age of the entire furnace. The weak links in the use process of the arch are the holes such as temperature measuring holes and pressure measuring holes, the horizontal seams of the arch bricks (commonly known as the head seam), the sling head of each arch and the side bricks of the arch. When the furnace is in normal operation, there is a positive pressure in the kiln, and the various holes in the top of the kiln are easily burned due to the fire. burn. Therefore, refractory materials with better performance should be used in these places, and sintered zircon bricks are currently used more.
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