Customized Furnace, Glass Melting Processing, Engineering Services
1. Brief Description
Glass is a special amorphous inorganic nonmetallic material. The
main component is silicate, a non-crystalline solid with an
irregular structure
Glass melting is the most important process in glass production, it
is a forming process where the batched materials form a qualified
liquid evenly with no bubbles under high temperature heating.
Technical process of glass
Glass liquid forming
In this stage, the sinter will be melting and the silicate and SiO2
in sinter will change to flint glass liquid with a plenty of
bubbles. However, its chemical components and character are not
even.
Clearing
The glass liquid is continuously heated, and its viscosity is
reduced with plenty of gaseous sundries released, which should
eliminate the visible bubbles with the pool of liquid.
Homogenization
The glass liquid is kept at high temperature for a long time, the
ripple eliminates by diffused function and homogenizes as a whole.
The temperature of homogenization can be lower than the clearing
stage.
Glass melting is a very complex process, it includes physical,
chemical and physicochemical phenomena and reaction. These
phenomena and reaction lead the mechanical mixed raw materials to
complex melting glass liquid.
Factors that influence the melting effects:
- Characteristic of raw materials
- Chemical component of batched materials
- Material feeding method
- Melting temperature
2. Type of Furnace
Capacity
| Small scale furnace | Daily furnace capacity: below 50tons |
| Medium scale furnace | Daily furnace capacity: 50tons~150tons |
| Large scale furnace | Daily furnace capacity: 150tons plus |
Product
| Flat glass furnace | For float glass, sheet glass and figured glass production line. |
| Domestic glass furnace | For container glass, tableware glass, tube glass, etc production
line. |
Heating source
| Fired furnace | The combustion fuel can be natural gas, heavy oil, diesel oil…… for
this kind of furnace. |
| Electric furnace | Electricity is the fuel for this kind of furnace. |
| Fired-electric furnace | This kind of furnace is mainly using combustion fuel, electricity
is used as a supplementary heating source. |
3. Furnace structure
According to current fired furnace structure, it is mainly divided
into four parts:
- Glass melting section
- Heat source supply section
- Waste heat recovery section
- Gas supply and waste gas exhaust
4. Furnace melting technology system
Furnace melting technology includes temperature, pressure,
bubbling, glass liquid level, fuel, reversing system etc.
Temperature
The temperature means the temperature the of melting tank, not the
whole furnace. The distribution of temperature is from the melting
tank through the length of the furnace.
Pressure
Furnace pressure is the static pressure of the gas system, which is
determinate by pressure distribution curve.
Bubbling
Stable shape and position of bubble are an important sign to
estimate the melting performance, which will also affect the
production capacity of furnace and quality of glass liquid.
Factors that affects bubbling:
- Shape of materials
- Fuel quality
- Quantity of cullet feeding
- Moisture of batched materials
- Quality of raw materials
- Port structure
