Glass industry nitrogen generatorIt is a nitrogen preparation equipment designed specifically for glass production scenarios. Its core function is to provide high-purity nitrogen gas (usually ≥ 99.9%, special processes require 99.99% or more) for protection and assistance in glass melting, annealing, coating and other processes. Its working principle is based on "gas separation technology", and the mainstream type is pressure swing adsorption (PSA). The specific process is as follows:
1、 Core technology: Separation principle of pressure swing adsorption (PSA)
Glass industry nitrogen generatorUsing air as raw material, utilizing adsorbents (commonly carbon molecular sieve CMS) to achieve the "adsorption selectivity difference" and "pressure sensitivity" of oxygen and nitrogen in the air, nitrogen and oxygen separation is achieved through a cyclic process of pressurized adsorption and depressurized desorption. The specific logic is as follows:
Adsorbent characteristics: Carbon molecular sieves have a much stronger adsorption capacity for oxygen than nitrogen, and the higher the pressure, the more significant the adsorption effect; When the pressure decreases, the adsorbed oxygen will be released (desorbed).
Circulating separation: The equipment works alternately through two parallel adsorption towers, with one tower pressurized to adsorb oxygen and produce nitrogen; The other tower is depressurized and desorbed to regenerate the adsorbent, ensuring continuous nitrogen production.
2、 Complete workflow (taking PSA type as an example)
Air pretreatment stage
The raw air is compressed to 0.6~1.0MPa by an air compressor and enters the pre filter to remove dust, oil mist, and moisture from the air (to avoid contaminating the adsorbent and affecting the separation effect).
The pre treated clean air enters the cooler for cooling and further dehydration to ensure that the air dew point meets the standard (usually ≤ -20 ℃).
Pressure adsorption stage
Clean compressed air enters one of the adsorption towers, and under pressure, carbon molecular sieves preferentially adsorb oxygen from the air (while also adsorbing a small amount of carbon dioxide and water vapor). Nitrogen, due to its weak adsorption capacity, directly passes through the adsorbent bed and becomes "crude nitrogen".
This stage lasts for several minutes until the adsorbent reaches saturation for oxygen adsorption.
Nitrogen purification and storage stage
The crude nitrogen gas enters the post fine filter to remove trace impurities and moisture, and is purified into high-purity nitrogen gas (meeting the requirements of glass production).
A portion of the purified nitrogen is directly transported to glass production lines (such as melting furnaces and annealing kilns), while the other portion is stored in nitrogen storage tanks to ensure stable nitrogen supply.
Decompression desorption and regeneration stage
When the first adsorption tower is saturated, the equipment automatically switches the valve, stops introducing air into the tower, and reduces the pressure inside the tower (to atmospheric or negative pressure).
After the pressure is reduced, impurities such as oxygen and carbon dioxide adsorbed by carbon molecular sieves are desorbed and discharged with exhaust gas. The adsorbent recovers its adsorption capacity and prepares for the next round of adsorption.
Two adsorption towers alternate in the "adsorption regeneration" cycle to achieve continuous and stable nitrogen production.
3、 Key supplement: Core design adapted to the glass industry
Adjustable nitrogen purity: By adjusting the adsorption time and pressure parameters, the nitrogen purity can be flexibly controlled (99.5%~99.999%) to meet different process requirements such as glass melting (anti-oxidation), coating (protective film layer), and hollow glass sealing (moisture-proof).
Stable nitrogen supply pressure: equipped with a stabilizing device to ensure that the output nitrogen pressure fluctuation is ≤± 0.02MPa, avoiding the impact of pressure fluctuations on glass production quality (such as coating uniformity and annealing effect).
Efficient and energy-saving design: During the switching process of the adsorption tower, some nitrogen is used to "equalize" the regenerated tower body, reducing energy loss and meeting the energy-saving needs of continuous production in the glass industry.