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Why Do We Need To Preheating Raw Materials in Float Glass Production?

Views: 52     Author: Site Editor     Publish Time: 2024-03-19      Origin: Site

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In the float glass process, sand, lime, and other float glass raw materials are weighed, mixed, moved into the furnace, and melted at high temperatures. Some float glass production lines are equipped with preheating devices, which can utilize the waste heat of the glass furnace flue gas to preheat the raw materials before the float glass raw materials enter the furnace, thereby improving the thermal efficiency of the glass melting furnace, reducing energy consumption and reducing environmental pollution.


The role of preheating float glass raw materials


Temperature uniformity


Preheating the float glass raw material can achieve uniform temperature throughout the batch mix. This helps the raw materials for float glass, such as silica sand, soda ash and limestone, reach the required temperatures evenly in the furnace and melt together.


Reduce thermal shock


When float glass raw materials are suddenly exposed to high temperatures, stresses can occur, causing uneven melting and potential defects in the glass product. Slow and gradual preheating minimizes thermal stress and helps the float glass production process transition more smoothly to the melting stage.


Improve energy efficiency


By preheating raw materials, the preheated material requires less energy to reach the melting temperature in the main furnace, thereby reducing the overall energy consumption in the glass production process. By preheating, it not only saves energy but also reduces carbon emissions.


Improved materials melting characteristics


By preheating the raw material in preparation for the subsequent melting stage, the raw material has better properties for producing float glass, such as viscosity, which allows for better control of the melting process in the main furnace. This in turn helps improve glass quality and production efficiency.


Adverse effects of insufficient preheating on production


Incomplete melting


Insufficient preheating is manifested by poor melting of the raw materials in the main furnace, which results in the presence of undissolved particles in the float glass. The consequence is that its transparency, flatness and overall quality will be affected, resulting in the production of float glass with defects, such as uneven thickness, changes in color or defects on the surface.


Increased energy consumption


Without proper preheating, the main furnace must compensate by using more energy to reach the required melting temperature of the float glass raw material. Increased energy consumption not only increases production costs, but also leads to increased carbon emissions, affecting the sustainability of the manufacturing process.


Formation of bubbles and inclusions


Insufficient preheating can result in gases and impurities being trapped within the float glass matrix. This can lead to the formation of bubbles and inclusions, negatively impacting the visual clarity and quality of the float glass product, resulting in increased scrap rates and waste.


Equipment strain


Incomplete preheating may subject the furnace to greater thermal stress, which may lead to wear and tear on float glass production equipment, increase the potential for unplanned downtime, create additional maintenance costs and reduce overall operational efficiency.


In conclusion, proper preheating in the float glass production process is crucial for achieving uniformity, reducing thermal shock, improving energy efficiency, and ensuring the quality and sustainability of the final product. Inadequate preheating can lead to a range of issues affecting transparency, quality, and operational efficiency, with associated economic and environmental consequences.


About us

Baisheng float glass production line manufacturer


Nanjing Baisheng was established in 2007. Baisheng is committed to the development and production of float glass production equipment, providing engineering construction, equipment manufacturing, debugging, production operations and other services for float glass production.


Over the years, Baisheng has supplied production equipment to glass manufacturers around the world, including top international glass companies such as Signify, Arc, Schott, Taiwan Glass, and Saint-Gobain. More than 100 furnaces have been built in the past decade.


Baisheng float glass production line manufacturer

Baisheng float glass production line manufacturer

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