In the glass manufacturing industry, the use of compressed air needs to meet specific pressure, flow, cleanliness and stability standards, the specific standard requirements are as follows:
pressure demand
universal demand the compressed air pressure commonly used in industry is usually between 0.7 and 1.0MPa, which can meet the operating requirements of most industrial equipment.
Special needs of the glass industry:
- raw material conveying system such as powder pneumatic conveying, weighing mixing and other links, the pressure range is generally 0.4~0.6MPa. A pressure stabilizing air storage tank shall be provided to ensure that the fluctuation of air supply pressure is ≤ ± 0.05MPa and to avoid intermittent powder delivery.
- Glass forming equipment if the feeder and determinant are pneumatically controlled, the pressure range is generally 0.6~0.8MPa. A precision pressure reducing valve is required to control the working pressure fluctuation within ± 0.02MPa to ensure the precision of glass droplet shaping.
- Annealing kiln cooling system: Such as wind cooling, stress relief and other links, the pressure range is generally 0.3~0.5MPa. A frequency conversion fan shall be configured to dynamically adjust the air volume according to the annealing curve to ensure that the cooling rate deviation of the glass ribbon is ≤ 5 ℃/h.
- coating process: such as vacuum coating machine auxiliary gas supply, the pressure range is generally 0.2~0.4MPa (after purification treatment).
- glass deep processing such as CNC engraving, tempering furnace pneumatic components, the pressure range is generally 0.5~0.7MPa. The need to meet the rapid start-stop requirements of the engraving head, the peak flow of 150 of the basic flow.
traffic demand
- the flow requirements of the glass manufacturing industry for compressed air vary depending on the specific process. For example, in the powder pneumatic conveying link, it is necessary to ensure sufficient flow to maintain the continuous conveying of powder; in the glass forming link, it is necessary to adjust the flow according to the operating requirements of the forming equipment.
Cleanliness requirements
- the glass manufacturing industry requires extremely high cleanliness of compressed air to prevent pollutants in compressed air (such as oil, water, dust, etc.) from affecting glass quality. Specific cleanliness standards may vary from company to company, but they usually need to comply with international standards such as ISO8573.1-2010.
- In order to achieve the standard of production gas, the purification of compressed air in the glass industry is inseparable from the compressed air precision filter and adsorption dryer. These devices can effectively remove the oil, water, dust and other pollutants in the compressed air to ensure the cleanliness of the compressed air.
Stability requirements
- the glass manufacturing industry also has very high requirements for the stability of compressed air. The pressure fluctuation and flow fluctuation of compressed air may affect the production quality of glass.
- In order to ensure the stability of compressed air, glass enterprises usually need to configure the pressure stabilizing tank, precision pressure reducing valve and other equipment, and adopt the graded gas supply scheme. For example, the pressure of the main air supply pipe network is set to 0.8MPa, which is distributed to each air consumption unit through the branch pipe pressure reducing valve.
