There are two types of separation devices for glass liquid: shallow separation and deep separation. The shallow separation has a collar and a cooling water pipe; the deep separation has a smelter barrier, etc. The function of the glass separation equipment is to block the unmelted batch scum and other objects in the melting part from flowing into the cooling part, adjust the convection halo of the glass liquid, reduce energy consumption and lower the temperature of the glass liquid.
(1) furnace neck
"Sneck" refers to a section of kiln pool narrowed between the end of the melting part and the front gable of the cooling part. It is a kind of separation equipment used with low hanging wall and hanging wall.
The main function of the neck is in three aspects: one is the tissue fluid flow, which makes the glass liquid from "compression" to "relaxation", and has the effect of further homogenizing the glass; the other is to separate the space, prevent air flow, and stabilize Operating system. Space separation + good melting furnace, colder air flow into the melting part is not conducive to high temperature clarification, hotter air flow into the cooling part will hinder the absorption of floating bubbles by the glass liquid, and this kind of air flow is particularly obvious when changing the fire ; The third is to play a cooling role. The glass liquid passing through the neck can be cooled by about 100°C. The clarified glass liquid has a sudden temperature drop, which is beneficial to the absorption of microbubbles by the glass liquid and is also a method to prevent "reboiling" phenomenon . When the temperature drops suddenly, the molten glass is stirred immediately to maintain the temperature uniformity of the molten glass forming stream.
After the kiln is narrowed, the corners where the melting part enters the neck are severely eroded by the molten glass. Therefore, the 41s oxidation method with high density and good corrosion resistance should be selected to strengthen the fused zirconium corundum brick masonry. After entering the neck, the pool wall adopts 33s or 36s oxidation method to strengthen the masonry of fused zirconium corundum bricks, and its external dimensions are the same as those of the melting part. The outside of the pool wall bricks is topped with angle steel and top wire.
(2) Cooling water pipe
In order to prevent the unmelted batch materials from the melting part from entering the cooling part, a water bag separating device is often installed in the molten glass at the junction of the melting part and the cooling part. The cooling water pipe is a commonly used water bag separation equipment, that is, the seamless steel pipe with cooling water is placed horizontally in the surface layer of the glass liquid at the neck, where 3/4~2/3 of the water pipe cross section is immersed in the glass liquid, 1 /4~1/3 are exposed on the liquid surface. After the liquid glass near the water pipe is cooled, a non-flowing layer with high viscosity is formed, forming a surface barrier to block the liquid glass surface, which can reduce the circulating convection of the liquid glass to a certain extent and block some unmelted liquid surface. Good scum. The cooling water pipe can cool the surface glass liquid by about 30°C when the water pressure is 0.25~0.3MPa. If used properly, the cooling water pipe can not only reduce the temperature, but also receive a good energy-saving effect; improper use will cause uneven temperature of the molten glass on the kiln width. The main disadvantage is the large water consumption and the increase in energy consumption. Usually the outlet water temperature of the cooling water pipe is controlled below 55°C.
(3) Kiln
Kiln sill refers to a device that raises a certain part of the pool bottom by a certain height in the form of thresholds or slopes (steps) at different parts of the pool bottom after the clarification section of the melting furnace. It is commonly used to set a slope (step) kiln ridge where the melting part enters the collar and a slope (step) kiln ridge where the collar enters the cooling part.
The function of the kiln ridge: First, it plays the role of shallow clarification, forcing the glass flow in the clarification zone to flow through the upper layer of the kiln pool and form a thin layer, so that the temperature of the glass can be further increased, which is beneficial to the removal of bubbles and can greatly accelerate the clarification. Speed and improve the quality of molten glass; the second is that the kiln can extend the residence time of the molten glass in the melting tank and prevent the dirty material from the bottom of the tank from flowing to the working part; the third is to reduce the heat loss of the convection of the molten glass and reduce energy consumption.
The kiln sill set below the highest temperature zone of the melting part does not belong to the previous type. Its function is to avoid the uneven quality of the molten glass caused by the fluctuation of the melting temperature by stabilizing the movement trajectory of the feeding reflux and the forming reflux in the kiln. This is a measure to improve the uniformity of flat glass. It is built with zirconium corundum bricks, which are available in solid and hollow forms.
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