Advantages and disadvantages of different height powder layers
Release time:
2025-06-18 00:00
Source:
1. Advantages and disadvantages of powder layer thickness
Taking conventional soda-calcium wine bottle products as an example, under normal circumstances, the height of the powder layer is controlled at 200~300mm, and the production effect is the best. If the height of the powder layer exceeds this range, it is easy to cause uneven material, that is, the height of each part of the powder layer is different, and frequent manual adjustments are required during the production process to maintain the flatness of the powder layer. Increasing the height of the powder layer will cause the interface between the molten glass and the powder layer (i.e., the theoretical liquid level position on the side of the melting cell) to move downward, and if a top-plug electrode is used, the electrode will be exposed to the powder layer, which will increase the risk of oxidative fracture of the electrode. However, the increase in the thickness of the powder layer can improve the insulation effect on the top of the melt bath, reduce heat loss, and thus reduce the energy consumption per unit of product. It should be noted that there are differences in the adaptability of different formulations of frit to the height of the powder layer, such as high barium and high boron, etc., and the excessively thick powder layer will hinder the normal discharge of gas, resulting in problems such as "hair cylinder" (the gas will lift the molten glass together with the powder, resulting in irregular overflow in the melting pool space) and "drum cannon" (the gas discharged locally from the powder layer will bulge the molten glass into a bubble, but it will not break, which is slightly less than the "hair cylinder" phenomenon) and other problems, such as improper treatment, It is easy to cause defects such as bubbles and stones caused by poor melting of molten glass.
2. Advantages and disadvantages of thin powder layer
In the glass production process, a thin powder layer helps to improve the heating uniformity of the glass raw material. The thinner layer of the powder allows the heat to penetrate the powder more quickly and evenly, which can improve the uniformity of the molten glass to a certain extent. This feature is crucial for products that require high glass uniformity.
When the powder layer is thin (height < 200 mm), the heat loss in the melting pool space is intensified, resulting in a significant increase in furnace energy consumption. In extreme cases. Due to the large loss of heat, the thermoelectric temperature is difficult to reach the set value, and the molten glass cannot be fully melted and clarified, resulting in a large number of stones, bubbles and other defects. In addition, the melt pool space is in a "red-top" or "semi-red-top" state for a long time, and the high-temperature environment is also a great challenge to the thermal stability of the feeder. For example, in the production process of high-boron glass, because the melting pool space is often in a semi-red-top state, the belt of the feeder needs to be made of high-temperature resistant material, while the production of ordinary soda-lime frit does not need this special requirement.
Related News
Physical and chemical properties and characteristics of glass liquid
The physical and chemical properties and characteristics of alkaline slag glass liquid such as erosion resistance, impedance, thermal stability, mechanical strength, bulk density and shrinkage. Among them, the glass liquid performs prominently in the reducing atmosphere and can effectively block metal drilling; low expansion coefficient and good thermal shock stability; After high temperature sintering, a dense structure is formed, with an internal compressive strength of up to 10-12 megapascals and a compressive strength of up to 64-70 megapascals. In addition, the configuration of capacitive high steel jade guide feeding, including inverted feeding, sealing material and mud, as well as the configuration method of binder, is also introduced.
What matters need to be paid attention to in the installation of steel structures
Precautions for steel structure installation: 1. During installation, it is necessary to ensure that the main foundation of the center is parallel to the plant building, and the promotion of the batching system should be well connected. 2. Calculation method of stair cutting size: calculated by horizontal height, horizontal length and channel steel model. 3. When installing decorative columns, first set the straight plane and then hang the angle circle beam to ensure accuracy and stability.
Advantages and disadvantages of different height powder layers
1. Advantages and disadvantages of powder layer thickness Taking conventional soda-calcium wine bottle products as an example, under normal circumstances, the height of the powder layer is controlled at 200~300mm, and the production effect is the best. If the height of the powder layer exceeds this range, it is easy to cause uneven material, that is,
Characteristics of the powder layer of the glass electric melting furnace
The batch layer covered on the surface of the electric melting furnace is called the powder layer, and the height of the powder layer is an important parameter for the design of the glass electric melting furnace. Different from the traditional flame kiln, the electric furnace adopts a vertical melting process, and the powder layer is completely covered on the surface of the molten glass in the melting pool, and at the same time, the heat radiation of the melt to the kiln roof is blocked, so that the temperature of the upper space of the kiln is reduced to below 150 degrees Celsius, commonly known as "cold top". The volatile components in the batch are condensed in the powder layer and flow back into the molten glass, and gases such as carbon dioxide released during the melting process can easily pass through the powder layer and enter the space. The powder layer flows from top to bottom and melts continuously as the temperature rises, gradually completing the clarification and homogenization process.
Structural reinforcement and design recommendations for the breast wall Problems in the design and reinforcement of the breast wall structure. It is recommended to consider tiling and supporting structures in the design to avoid voids and deformations. At the same time, on-site construction can also be carried out according to the actual situation, and various materials and methods can be used for reinforcement. In addition, the problem that the exposed steel bricks in the oven process are not affixed with thermal insulation paper leads to serious explosions, which reminds everyone to pay attention to this problem and avoid similar situations.
On-site treatment of cover brick tilting problem and problem analysis
Measures to deal with the problem of tilting of cover bricks The top wire of the cover of an electric furnace built by our company is movable and can be twisted by hand. The reason is that the open-hearth furnace is not adjusted in time when it is kept warm and resumed production, which causes the lower pool wall or the top wire of the pool wall to shrink and the gap to become larger when the furnace is stopped. When the temperature rises, the gap becomes larger, and the bricks will go outward, causing them to sink. In order to solve this problem, a wire position can be welded between the supporting plate and the column to make the supporting plate fixed. In addition, the lack of power of the flowing fans, resulting in large temperature differences, may also be one of the reasons. Finally, the cover bricks and the fused bricks between the over-layer are not reinforced and also need to be strengthened.