The main phenomenon of carbon molecular sieve leakage in nitrogen generators is that black smoke or even molecular sieve particles are emitted from the exhaust management during the oxygen-enriched exhaust process of the nitrogen generator. The pulverization of the molecular sieve and damage to the internal components of the equipment are the direct causes of the leakage of nitrogen generator powder.

1.1 Poor Quality Of Nitrogen Molecular Sieve

Carbon molecular sieve is an adsorbent that separates nitrogen and adsorbs oxygen. Its quality directly affects the performance of the nitrogen generator and the purity of the gas supply. Molecular sieves of good quality have better dust resistance, moisture resistance, strength, and adsorption than molecular sieves of general quality. Molecular sieves of poor quality have a short service life and aggravate pulverization during operation.

Xintao carbon molecular sieves are of superior quality, made of new raw materials and produced by its own process. They have high strength, low dust, are not easy to pulverize, and have a large nitrogen production capacity. They are trusted by customers at home and abroad.

1.2 Molecular Sieve Filling Is Not Right

The nitrogen generator does not have professional filling vibration equipment when filling the molecular sieve, resulting in low filling density of the molecular sieve inside the machine. When the nitrogen generator is running, the compressed air flows through the bottom of the tank and rises. After the oxygen is adsorbed by the molecular sieve, the nitrogen is transported to the downstream pipeline. Due to the frequent impact of the airflow, the internal molecular sieve is aggravated, and the material level of the molecular sieve gradually decreases. When it drops to the lower limit of the top cylinder, the cylinder no longer compresses and restricts the molecular sieve, thereby accelerating the pulverization of the molecular sieve, causing the powder to pass through the filter and be emptied with the oxygen enrichment.

1.3 Gas Source Pressure

The purified compressed air enters the bottom of the nitrogen generator tower. The pressure of the air supply source affects the working condition of the nitrogen generator. Due to the high frequency of pressurization and decompression of the PSA nitrogen generator, the impact of the pressurized gas on the molecular sieve is very honorable, causing the wear of the carbon molecular sieve, so the pressure and flow rate of the gas source must be strictly controlled. The gas source pressure is too large. At the moment when the pneumatic valve is opened, the gas source has a large impact on the molecular sieve, which increases the friction between the molecular sieves. After the molecular sieve is fully adsorbed, the moment the air intake pneumatic valve is closed, the static friction of the molecular sieve when it falls is also relatively large. The gas source pressure is too low, and the molecular sieve takes a long time to absorb oxygen to reach saturation. In other words, the working time of the nitrogen generator to output qualified nitrogen is prolonged, and the friction time between the molecular sieves is prolonged, which accelerates the pulverization of the molecular sieves.

1.4 Pneumatic Valves Are Not Tight

The nitrogen generator pipeline is equipped with pneumatic fast-opening butterfly valve group, pressure equalizing valve group, exhaust valve group and vent valve group. Any valve group that is not closed tightly may cause airflow in another nitrogen generator that is temporarily not working. The surging of airflow will also increase the static friction between the molecular sieves, exacerbating the pulverization of the molecular sieve.

1.5 Intake Moisture, Oil And Gas Lead To Failure

The front-end air intake source of the nitrogen generator is equipped with multi-stage filtering facilities and drying facilities. This set of equipment mainly includes a gas source purification system composed of a cold dryer, an over-efficiency filter, an alumina heating dryer, and a precision filter.

The filter element and alumina ceramic ball in the gas source purification system need to be replaced regularly. Damage to the filter element or untimely replacement will cause water and oil gas in the gas source, and water and oil are the most important factors affecting the quality and service life of the molecular sieve.

1.6 The Top Cylinder Is Not Tight

The low instrument air pressure, cylinder damage and low material level of the nitrogen generator are all reasons why the top cylinder cannot be pressed tightly. When the top cylinder is not tight, the cylinder no longer restricts the molecular sieve. After the airflow enters, it gives the molecular sieve a larger activity space, increases the impact force between the molecular sieves, accelerates the pulverization of the molecular sieve, and seriously affects the firmness of the internal structure of the equipment and aggravates the damage of the internal components of the equipment.

1.7 The Filter And Coconut Mat Are Broken

Due to the long-term impact of the airflow and molecular sieve, the middle part of the filter and coconut mat is damaged, causing the molecular sieve to fall to the bottom of the tank and leak out with the oxygen-enriched external exhaust pipe. If the damaged filter and coconut mat are not replaced in time, a vicious cycle will be formed, affecting the purity and flow of the product gas, and seriously affecting the stability and safety of the equipment operation.

Xintao Carbon Molecular Sieve Manufacturer

Xintao was founded in 2002. In the field of gas separation applications, we have more than 20 years of experience. We always adhere to the concept of creating value for customers and provide unique products, services, technical consulting and solutions for the global gas and gas equipment field. Xintao's customers are all over the world, including Southeast Asia, the Middle East, Europe and South America, and its products are exported to more than 140 regions. Xintao carbon molecular sieves are widely used in petroleum, chemical, coal mining, metallurgy, tires, medical, food, aviation and other industries.