Classification of glass kiln

Classification of glass kiln

Glass tank kiln is a common glass melting furnace, which mainly consists of a melting tank and a regenerator or heat exchange chamber. The raw materials are added from one end of the melting pool. After melting, clarification, cooling and other stages, they are led out from the other section for shaping. It is a type of glass melting furnace.

The batch materials are put into the trough-shaped pool of the kiln and are melted into molten glass, so it is called a pool kiln. There are two types of pool kilns: intermittent type and continuous type.

Intermittent pool kilns, also known as daily pool kilns, are generally small, with a molten pool area of only a few square meters. After the melting process is completed, the material is taken from the material inlet and is mostly formed manually or semi-mechanically. Suitable for producing special glass.

The vast majority of pool kilns are of the continuous type, with each melting stage taking place in different parts of the kiln. The temperature regime of each part is stable. The batch materials are put in from the feeding port, go through the process of melting, clarification and homogenization of the glass liquid in the melting section, then transfer to the cooling section for further homogenization and cooling, and then enter the forming section for final homogenization (including homogenization of the temperature of the glass liquid) and stabilization Feed temperature. Since the temperature of the molten glass near the bottom of the tank kiln is low and the flow is stagnant, the total capacity of the molten glass in the kiln is greater than the operating glass volume, and the feeding amount and molding amount of continuous operations are balanced. The molten glass is formed using continuous mechanization. The size of a pool melting kiln is expressed by the area of the melting part. The melting section of a large tank kiln for the production of bottle glass has an area of more than 150m2, the production capacity can usually reach 300~400t/24h, and the melting rate can reach 2.5~3t/24h/m2. The continuous tank kiln has a large capacity, relatively less heat loss, and its thermal efficiency is significantly higher than that of the crucible kiln. It is suitable for high-efficiency continuous production in large quantities.

Glass kilns are often heated with gas fuel. The flame directly passes over the top of the melting tank, and a regenerator or heat exchange chamber is used to preheat the air required for combustion to improve heat utilization. The operation is continuous, the productivity is high, the fuel consumption is low, and it is easy to mechanize and automate. Used to make flat glass, bottle glass, glass tubes, etc. There are also intermittent small tank kilns that can be used to replace crucible kilns.

Glass pool kiln is also an industry kiln that our refractory material industry often serves. Different kilns use different refractory materials according to different needs. Therefore, it is also important to clearly understand the classification of glass tank kilns. There are many ways to classify glass tank kilns:

 Classification by heat source used

1. Flame kiln; uses fuel combustion as the source of heat energy. Fuel can be gas, heavy oil and water.

2. Electric kiln; uses electric energy as the heat source.

3. Flame-electric heating kiln; uses fuel as the main heat source and electricity as the auxiliary heat source.

Classification according to the continuity of the melting process

1. Intermittent kiln; the various stages of glass melting are carried out in the same part of the kiln at different times, and the temperature system of the kiln changes.

2. Continuous kiln: Each stage of glass melting is carried out at the same time and in different parts of the kiln, and the temperature system in the kiln is stable.

Classification by flue gas waste heat recovery equipment

1. Regenerative kiln; the waste heat of flue gas is recovered according to the regenerative method.

2. Heat exchange kiln; the waste heat of the flue gas is recovered according to the heat exchange method.

Classification according to the direction of flame flow in the kiln

Horseshoe flame kiln; the flame in the kiln flows in a horseshoe shape.