Temperature rising furnace of runner flashboard of float glass production line, and temperature rising and exchange method

Abstract

The invention relates to the field of float glass production, and discloses a temperature rising furnace of the runner flashboard of a float glass production line, and a temperature rising and exchange method. The temperature rising furnace comprises a flashboard cavity (3) for accommodating at least part of a flashboard (1) to be heated, a heating part, which is capable of heating the flashboard cavity (3) so as to raise the temperature of the flashboard (1) in the flashboard cavity (3), and a temperature sensing unit, which can sense the temperature in the flashboard cavity (3). The temperature rising furnace and the float glass production line are separated; thus the temperature rising process of flashboard will not influence the float glass production line; moreover, the temperature rising furnace is provided with a temperature sensing unit, the temperature rising of flashboard can be finely controlled, and the qualified rate of temperature rising of runner flashboard of float glass production line is obviously improved.

Description

technical field [0001] The invention relates to the field of float glass production, in particular to a heating furnace, a heating method and a replacement method for a flow channel shutter of a float glass production line. Background technique [0002] In the ordinary float glass production line, a shutter is installed at the glass flow channel, and the flow of glass liquid flowing into the forming section is controlled by adjusting the opening of the shutter. Among them, the temperature of the molten glass at the molten glass flow channel is generally about 1120°C. Therefore, the gate plate usually adopts a melting glass with good thermal shock resistance, which can not be eroded by the molten glass at 1150°C, and has no pollution to the molten glass. Quartz is used as the material of the gate. [0003] The fused silica gate needs to be replaced once it is used for 3 to 5 months at a temperature of 1120°C. Traditionally, two gates are usually set at the glass liquid flow...

AI Technical Summary

Problems solved by technology

Among them, since the cover brick 16 above the flow channel 15 needs to be uncovered when the gate is replaced, dust will fall into the glass liquid in the flow channel 15, which will affect the quality of the glass, and no qualified products will be produced during the entire gate replacement process. , affecting glass production for a long time

[0004] In addition, although the ram made of fused silica has excellent thermal shock resistance, the entire heating process of the ram 101 to be placed is affected by the hot air flow in the flow channel 15 and the ambient temperature outside the flow channel 15, resulting in The temperature of 101 fluctuates greatly, and the damage rate of the ram 101 to be put in is about 30% during the baking and heating process of the ram 101 to be put in when the ram is replaced.

Once damaged, it is necessary to replace the gate and heat up the gate again, which greatly prolongs the replacement time of the gate and affects the normal operation of the glass production line for a long time

In addition, since the part of the gate 101 to be placed below the cover brick 16 of the runner 15 can be closer to the temperature of the molten glass, the temperature difference between the upper and lower sides of the gate 101 to be placed in is several hundred degrees Celsius. When the glass liquid is slowly inserted, it will be subject to a large thermal shock, which will easily cause the gate to burst, so that the gate needs to be replaced and reheated from scratch

[0005] In addition, the gate made of fused silica can only be used in ordinary float glass production lines with a glass liquid temperature below 1150°C. For special float glass production lines that produce high-alumina protective glass and TFT liquid crystal glass, the glass liquid The temperature of the flow channel is as high as 1350°C. The special float glass production line needs to use fused corundum gates or fused zirconia corundum gates, which have excellent high temperature resistance to glass liquid erosion and no pollution to glass liquid.

However, the thermal shock resistance of the gate plate made of fused corundum or fused zirconia corundum material is very poor, and the damage rate of the gate plate can reach 99% by using the above-mentioned conventional replacement method for the gate plate of the molten glass channel. At the same time, the temperature rise rate of the ram made of fused corundum or fused zirconia corundum needs to be controlled within a relatively small range, so that the replacement process of the ram of the glass liquid channel of the special float glass production line needs to last at least 3 days, causing great economic losses

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