High purity membrane separation nitrogen preparation generator

The core of the high-purity membrane separation nitrogen preparation generator is to utilize the difference in permeation rate of different gas components by polymer hollow fiber membranes to achieve efficient separation of air components. The entire nitrogen production process does not require phase change and can be completed by pressure drive alone, with the characteristics of high energy utilization efficiency and simple process.

Core principle: The magic of "selective permeation" of polymer membranes

　　High purity membrane separation nitrogen preparation generatorThe core of the work is to utilize the difference in permeation rate of different gas components through polymer hollow fiber membranes to achieve efficient separation of air components. The entire nitrogen production process does not require phase change and can be completed solely through pressure drive, with the characteristics of high energy utilization efficiency and simple process. The core logic of this technology stems from "permeation selectivity" - when compressed air flows through the membrane module, small molecule gases such as oxygen, moisture, carbon dioxide, etc. in the air have a strong affinity for the membrane material and a fast permeation rate, which can quickly pass through the membrane wall; Nitrogen molecules, due to their large molecular diameter, weak affinity with membrane materials, and slow permeation rate, accumulate at the outlet of the membrane module, forming high-purity nitrogen gas.

The specific workflow can be divided into three core stages: the first stage is the air pretreatment stage. After the ambient air is filtered by the primary air filter to remove solid impurities such as dust and particles, it enters the oil-free air compressor and is pressurized to 0.6-1.0MPa. Oil free compression is the key to ensuring the lifespan of membrane components and the purity of nitrogen gas, which can effectively prevent oil vapor from contaminating membrane materials. The pressurized air then enters the freeze dryer and precision filter. The freeze dryer lowers the air temperature to 2-5 ℃, causing the moisture in the air to condense into liquid water and be separated and discharged, reducing the dew point of the air to below -20 ℃; Precision filters further remove trace amounts of oil mist, hydrocarbons, and other impurities from the air, ensuring that the cleanliness of the air entering the membrane module meets the ISO8573-1 Class 1 standard.

The compressed air that has undergone deep purification enters the core membrane separation unit, which is composed of hundreds or even thousands of polymer hollow fiber membranes with a diameter of only a few hundred microns and a nanoscale microporous structure on the inner wall. When air flows inside the membrane, rapidly permeable components such as oxygen and carbon dioxide penetrate the membrane wall and enter the gap between the membrane and the outer shell, and are directly discharged as "residual gas"; And nitrogen gas, as a "trapped gas", collects at the end of the membrane and is regulated by a pressure stabilizing valve to form product nitrogen gas with a purity of up to 95% -99.99%, which is directly transported to the gas consumption point or stored in a buffer tank for backup. The entire process is continuous and uninterrupted, as long as there is compressed air input, nitrogen can be continuously produced, achieving "instant production and on-demand gas supply".

Core component: A "hardcore" configuration that supports efficient gas production

The performance of a membrane separation nitrogen generator directly depends on the quality of its core components. Its overall structure adopts a modular design, mainly consisting of four parts: air pretreatment system, membrane separation system, control system, and auxiliary system. Each component works together to ensure stable and efficient operation of the equipment. Among them, membrane components are the core components that determine nitrogen production efficiency and nitrogen purity. The current mainstream membrane materials are high molecular weight materials such as polyimide (PI) and polysulfone (PSF), which have good chemical stability, high temperature resistance, and mechanical strength. They can work stably in high-pressure environments for a long time and have a service life of 3-5 years.

The air pretreatment system is the "protective barrier" of the equipment. In addition to the primary filter and oil-free air compressor, it is also equipped with adsorption dryers (some models) and activated carbon filters. The adsorption dryer uses molecular sieves to adsorb residual moisture in the air, further reducing the dew point to below -40 ℃ to avoid condensation of moisture inside the membrane module and affecting permeability performance; Activated carbon filters are specifically designed to remove organic vapors and odors from the air, making them particularly suitable for fields such as food and medicine that have special requirements for nitrogen purity. Oil free air compressors often adopt silent screw or piston designs, with operating noise controlled below 65dB (A), suitable for noise sensitive environments such as workshops and laboratories.

The control system adopts a combination of PLC programmable logic controller and touch screen display, which can monitor key parameters such as nitrogen purity, flow rate, pressure in real time, and support one click adjustment of parameters. When the nitrogen purity is lower than the set value or the system pressure is abnormal, the equipment will automatically sound and light an alarm, and start corresponding protection programs, such as cutting off the intake, reducing the load, etc., to avoid unqualified nitrogen affecting production or experiments. Some models also support remote monitoring function, which uploads device operation data to the cloud platform through the IoT module. Users can view the device status in real time through their mobile phones or computers, achieving remote operation and fault diagnosis.

The auxiliary system includes components such as nitrogen buffer tank, pressure regulating valve, flow meter, etc. The function of the buffer tank is to stabilize the nitrogen output pressure and avoid pressure fluctuations affecting the gas equipment; The pressure regulating valve can accurately adjust the nitrogen outlet pressure according to the gas demand, adapting to different pressure requirements; The flow meter displays the nitrogen production in real-time, facilitating cost accounting and usage management for users.

　　High purity membrane separation nitrogen preparation generatorTechnical advantage: core competitiveness for adapting to multiple scenarios

Compared with traditional nitrogen generation methods and PSA nitrogen generation equipment, membrane separation nitrogen generators exhibit unique advantages in structure, performance, operation and maintenance, making them highly competitive in low to medium purity nitrogen demand scenarios. In terms of structure and deployment, its characteristics are compact and lightweight. Due to the absence of PSA equipment for the adsorption tower switching system, the equipment volume can be reduced by more than 30%, occupying an area of only 0.2-0.8 square meters. The lightweight model weighs only a few tens of kilograms and can be directly placed next to the production line, laboratory workbench side, or even fixed and installed through brackets, making it particularly suitable for small space scenarios. Some mobile models are also equipped with swivel wheels, which can be flexibly moved according to production needs, achieving multi station shared gas supply.

Membrane separation technology has significant advantages in terms of operation stability and maintenance cost. The equipment has no moving parts (except for the air compressor), and there is no pressure fluctuation or impact during the switching of the PSA equipment adsorption tower. The operation is smoother, and the failure rate can be reduced by more than 60%. In terms of maintenance, its core consumables are only filter cartridges and membrane components. The filter cartridges are replaced every 3-6 months, and the operation is simple without the need for professional technicians; The service life of membrane components is as long as 3-5 years, which is much higher than the molecular sieve of PSA equipment (1-2 years), and the long-term maintenance cost is lower. Taking a model with a gas production capacity of 10m3/h as an example, the annual maintenance cost is only 2000-3000 yuan, which is less than 5% of the procurement cost of traditional bottled nitrogen.

In terms of nitrogen parameter adjustment and environmental adaptability, membrane separation nitrogen generator also performs well. The purity of nitrogen can be flexibly controlled by adjusting the intake pressure and flow rate, continuously adjustable from 95% to 99.99%, to meet the needs of different scenarios - such as 95% purity for food packaging, while 99.99% purity is required for electronic component protection. In terms of environmental adaptability, the equipment can operate stably in a wide temperature range of -10 ℃ -45 ℃ and a relative humidity environment of 30% -90%, without the need for a dedicated temperature control room; Some outdoor models also have rainstorm prevention and dust-proof design, which can adapt to harsh outdoor working environments such as oil fields and mines.