300 tpd Flint Glass Melting Furnace with Energy Saving and Natural Gas Fuel

Glass melting furnace refers to the thermal equipment used in glass manufacturing to melt glass mixtures. This process involves mixing prepared powder according to the glass composition with added cullet (broken glass) at high temperature in the kiln to melt, clarify, and form glass liquid that meets forming requirements.

Glass manufacturing has a history of 5000 years, with traditional methods using firewood as fuel and melting glass materials in clay jars. Modern development began in 1867 when Germany built the first continuous coal-fired tank furnace, with rapid advancements occurring after 1945.

Glass melting is defined as the process where raw materials are heated to temperatures between 1500 to 1700°C, undergoing chemical reactions to transform into molten glass within a furnace. This continuous process involves raw material introduction that mixes with molten glass, facilitated by natural convection and gas reactions.

• End fired regenerative furnace
• Cross fired regenerative furnace
• Recuperative furnace
• Full-Oxygen furnace
• Electric furnace

Raw batch materials are heated and chemical reactions take place to generate silicate sinter with residual silica, which lays foundation for subsequent glass liquid formation.

In this stage, the sinter melts and the silicate and SiO2 in sinter transform into flint glass liquid with numerous bubbles. However, chemical components and characteristics are not yet uniform.

The glass liquid is continuously heated, reducing its viscosity and releasing gaseous impurities. This process eliminates visible bubbles within the liquid pool.

The glass liquid is maintained at high temperature for extended periods, eliminating striae through diffusion function and achieving complete homogenization. Homogenization temperature can be lower than the clearing stage.

• Melting Section: The part that melts batched materials while clearing and homogenizing glass liquid. The upper space is the flame space, while the lower part is the melting tank.
• Dog House: Batched materials feed into the furnace through the dog house, with heat transferred via flame space to the glass liquid.
• Air, Gas Access: Heated air and gas flow into the pre-combustion room for mixing after exiting the regenerator. This also serves as access for flue gas to flow into the regenerator from the flame space.
• Port: Critical furnace component where fuel mixes with preheated air, serving as access for preheated air into the furnace and for exhausting waste gas.

Furnace melting technology includes temperature, pressure, bubbling, glass liquid level, fuel, and reversing systems.