150TPD, Glass Industry, Melting Furnace, Design And Construction
1. Brief Description
Glass was used for windows and doors by the Ancient Romans as early
as the 4th century.
Glass is a special amorphous inorganic nonmetallic material. The
main component is silicate, a non-crystalline solid with an
irregular structure.
Glass furnace is a melting device, which is the most necessary and
important equipment for the glass industry
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.
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. |
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
Melting section
It is the part which melts batched materials and Clearing and
homogenizes glass liquid. In the upper space of the melting section
is referred to as the flame space, the lower part is melting tank.
The flame comes from the burner through the port, which feds in
preheated air to increase the flame effiency.
Dog house
Batched materials feed into the furnace through dog house, the heat
is transferred via flame space to the glass liquid.
Air, gas access
The heated air and gas flow into the pre-combustion room for mixing
via this access after they flow out of the regenerator. This is
also an access for the flue gas to flow into the regenerator from
the flame space.
Pre-combustion room
After the air and gas flow out from the access, under the airflow
vortex motion, and molecule diffusion and collision, the air and
gas will mix before flowing into the furnace.
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.
