For the float production process, the cooling part refers to the part of the melting furnace from the end of the neck to the front of the runner; for the calendering, flat drawing, and vertical pull-up process, it refers to the horizontal passage and branch passage from the end of the neck to the forming chamber, etc. Furnace part. Its function is to ensure that the molten glass in the melting part can continue to be homogenized and cooled to the necessary temperature and viscosity for forming. Different production processes and scales require different forming temperatures of molten glass and different areas of cooling parts. The greater the production capacity and output of the melting furnace, the more molten glass flows into the cooling part, and the larger the cooling area required.
The structure of the cooling part is basically the same as that of the melting part, and is also composed of the kiln pool and the upper structure surrounding the gas space on the kiln pool. The pool depth of the cooling part is generally 150~300mm shallower than the melting part.
(1) Pool bottom
The big brick at the bottom of the pool is the same as the melting part. The paving bricks on the big brick usually adopt 33# non-shrinkage oxidized zirconia corundum brick or α-β corundum brick. Some melting furnaces use calcium silicate board and aluminum silicate fiber felt to keep the bottom of the tank warm.
(2) Pool wall
Since the cooling part has a lower temperature than the melting part, the use conditions of the pool wall tiles are better than those of the melting part, but because it has to bear the high-quality molten glass required for forming, the requirements for the bricks are different from those of the melting part. At present, the pool wall bricks are generally constructed with a large 33s oxidation method with a thickness of 250mm, a width of 300~450mm, and a height of 1250~1350mm by vertical joints. For high-quality furnaces, α-β corundum bricks are used. . The pool wall tiles of the cooling part of the float glass production line are usually not insulated; the cooling part (horizontal channel, branch channel) of the production line of the rolling process, the flat drawing process, and the vertical lead process are usually insulated.
(3) The breast wall and the big chute
In order to reduce heat dissipation and slow down the temperature of the molten glass, the height of the breast wall of the cooling part and the height of the trough of the cooling part are both smaller than the melting part.
Both the breast wall and the big chute of the cooling part are built with high-quality silica bricks, and the upper gap bricks are used for sealing. In order to reduce the cooling rate and maintain a high temperature index of the molten glass, the dome can be insulated with insulation materials on the two ribs according to production needs. When the cooling area is not large enough, the dome does not need to be insulated.
The force transmission path of the cooling part and the breast wall is the same as that of the melting part and the breast wall.
(4) Front and back gables
The front gable structure of the cooling part is the same as the rear gable structure of the melting part, which adopts the method of building the wall on the load-bearing anchorage, and uses high-quality silica bricks. The middle part of the back gable wall of the cooling part is located on the flat arches built with beta corundum bricks, and both sides are located on the parapet pallets, which are built with high-quality silica bricks.
The masonry in the cooling part has a lower temperature than the melting part, as well as low chute and hanging wall barriers, which are not in contact with flames, so there is generally no need for hot repair in a production cycle. In addition, some operation holes are arranged around the cooling part: such as dilution air hole, liquid level control sight hole, liquid surface mirror hole, kiln pressure tapping hole, observation hole, thermocouple insertion hole and slag hole.
In order to stabilize the forming temperature and the pressure of the cooling part, the method of blowing (hot) air to the cooling part is adopted.
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