Issues that need to be paid attention to in the lining design of the liquid hole, tank bottom and other parts of the glass kiln

Issues that need to be paid attention to in the lining design of the liquid hole, tank bottom and other parts of the glass kiln

About the structural design of the liquid hole

The liquid hole is an important part of the glass furnace. The melted, clarified, and homogenized glass liquid passes through it and enters the distribution channel and supply channel for further homogenization and cooling, and finally enters the molding equipment for production and molding. There are 360~400t of molten glass passing through this narrow channel every day, and the erosion and wear of the molten glass on it is great. Moreover, the working environment of the liquid hole is poor and the surrounding temperature is high. Once there is a problem, it cannot be replaced. Therefore, fused AZS41# bricks or sawn bricks with better corrosion resistance are used in liquid flow holes. The fused AZS brick has the property of upward corrosion holes at the interface of solid phase, liquid phase and gas phase. The fused AZS brick is in the solid phase, the glass liquid is in the liquid phase, and the bubbles remaining in the glass liquid are in the gas phase, causing liquid holes. The cover bricks eroded more than other places. In 5 to 6 years, the thickness of the cover bricks was eroded upward by 300 to 400 mm. After the cover bricks of the liquid hole were eroded by 300 to 400 mm, the depth of the glass liquid was shallower, equivalent to the original depth. The depth of the kiln pool has been reduced by 300~400mm, and the output of the kiln will definitely be affected. In order to meet the output, the only way to increase the furnace temperature is to increase the energy consumption. After a few years, the burnt damage to the furnace cover and other furnace bodies will cause the furnace body to become thinner, the internal temperature will increase, and the heat dissipation of the furnace body will further increase.

In summary, the structure of the liquid hole will affect the life of the honey furnace, the output and energy consumption. In view of the corrosion mechanism of the Liuli Cave ginger slab bricks, we designed the contact surface between the Liuli Cave cover bricks and the glass liquid to be inclined, so that the bubbles in the glass liquid are not easy to adhere to the Liuli Cave cover bricks, thus greatly reducing the risk of corrosion. It slows down the erosion of the liquid hole cover bricks and extends the life of the liquid hole, which also extends the life of the kiln.

About the bottom structure of the pool

The bottom structure of the kiln can also easily affect the life of the kiln, especially the kiln with high white material or crystal white material. Due to its good heat permeability, the temperature of the bottom of the tank is high, and some metal objects will inevitably be brought into the batch materials. , metal objects corrode the fused AZS more severely (downward holes). Once the fused AZS bricks are corroded and the glass liquid penetrates under the floor bricks, "upward holes" will be formed, forming stalactites. Erosion will quickly corrode the AZS bricks on the bottom floor, causing great harm to the safety of the entire pool bottom and affecting the life of the kiln. In serious cases, material leakage accidents at the bottom of the pool may occur.

In order to prevent such incidents from happening, firstly, the entry of metal objects in the batch materials must be strictly controlled, and secondly, the anti-leakage structure at the bottom of the pool must be strengthened. The pool bottom structure designed this time is a multi-layer composite structure.

The shape of the feeding pool should be determined by the type of feeding machine. Practice at home and abroad has proven that the swing wrap-in feeding machine has the best feeding effect and energy-saving effect at present, and can save about 5% of energy. The energy-saving principle of the swing feeder is as follows:

(1) Generally, the batch materials added into the furnace by the feeding machine float on the surface of the glass liquid. Because the batch material is loose, its thermal conductivity is very low and the melting speed is slow. The feeder is used to squeeze the batch material into the glass liquid. During this process, the high-temperature glass liquid is squeezed up to fill the pores in the batch material and increase the thermal conductivity of the batch material. If the feeding machine is installed If adjusted well, the batch material will be partially wrapped in the glass liquid like dough, so the melting speed will be greatly accelerated. The output of the material can be increased due to fast melting, thus reducing energy consumption.

(2) The swing wrap-in feeder can swing and feed materials in three directions: left, middle and right. The number of pushing materials in the three directions can be set and adjusted arbitrarily, so that the material pile is very evenly distributed in the melting pool and the melting pool area can be fully utilized. , which effectively utilizes the radiant energy in the flame space and improves the utilization rate of the melting pool, thus further accelerating the melting speed.

(3) Since the materials are fed in three directions respectively, the batch materials are in small piles surrounded by the glass liquid in the furnace, which increases the contact area with the glass liquid and realizes thin layer feeding.

(4) From another perspective, the swing feeder also has the advantage of extending the life of the kiln. Since the swing feeder regularly pushes the batch materials in three directions, the batch materials are at the rear end of the melting pool. Evenly distributed, it is in direct contact with the pool wall bricks for a short time, or even not directly in contact with the pool wall bricks, thus extending the life of the pool wall bricks, because the batch material erodes the pool wall bricks much more than the glass liquid.