Liquid nitrogen plant manufacturer - OuRui Air Separation

Located in the picturesque region along the Fuchun River, Hangzhou OuRui Air Separation Equipment Co., Ltd. stands as a beacon of innovation and quality in the field of air separation technology. Nestled between the renowned West Lake and Qiandao Lake, our company benefits from unparalleled accessibility, being just 1.5 kilometers from the Hangzhou New Expressway Fengchuan exit.

OuRui Air Separation specializes in the manufacturing of advanced cryogenic air separation systems, with a particular focus on liquid nitrogen plants, liquid oxygen equipment, and liquid nitrogen generators. Our proprietary Mixed-refrigerant technology ensures efficient liquefaction of nitrogen at temperatures as low as -180℃. This cutting-edge technology not only guarantees superior performance but also aligns with our commitment to sustainable and reliable industrial solutions.

Spanning over 14,000 square meters, our state-of-the-art facility is equipped with advanced product testing equipment, reflecting our dedication to quality and excellence. With ISO9001 quality system certification and numerous accolades, including the "Contracts and Keep Promise Unit," OuRui has firmly established itself as a key player in Zhejiang Province's high-tech industrial landscape.

Our liquid nitrogen machines and other offerings are integral to numerous sectors, from metallurgy and petrochemicals to pharmaceuticals and food preservation. At OuRui Air Separation, we are not just exporting products; we are exporting trust, efficiency, and unparalleled technological advancement to the world.

Liquid Nitrogen Plant

What Is liquid nitrogen plant

A liquid nitrogen plant is an advanced technological system designed to produce liquid nitrogen by extracting it directly from the air. The primary function of this plant is to supply liquid nitrogen in various quantities, catering to a range of industrial, medical, and scientific applications.

Operation and Design

● Core Functionality

The liquid nitrogen plant comprises a modular system that emphasizes versatility and robustness. The plant can operate continuously, 24 hours a day, and 7 days a week, ensuring a reliable and steady supply of liquid nitrogen. The system's efficiency is further highlighted by its automatic operations, including an automatic level indicator that initiates a standby mode when the storage Dewar is full, thereby optimizing energy use and preventing overproduction.

● Production Capacity

One of the key features of the liquid nitrogen plant is its adaptability to different scales of production. Depending on the model, these plants can produce between 10 to 240 liters of liquid nitrogen per day. This flexibility allows them to meet the diverse needs of various users, from small-scale laboratories to large industrial operations, ensuring that there is an appropriate model for every requirement.

Maintenance and Usability

● Ease of Maintenance

Maintaining the liquid nitrogen plant is straightforward and can usually be performed on-site with minimal technical training. The design of the plant ensures that most maintenance tasks are user-friendly, thus minimizing downtime and ensuring continuous operation. For those requiring additional technical know-how, specialized training is available, offering comprehensive support to users.

● Safety Features

Safety is paramount in the operation of liquid nitrogen plants. These systems are designed to function automatically and safely, incorporating multiple safety mechanisms to protect both the equipment and the operators. The low-loss liquid nitrogen transfer system, which includes cryogenically insulated extraction lines and valves, helps minimize the risks associated with the handling and transfer of cryogenic fluids.

Customization and Advanced Options

● Customizable Solutions

Liquid nitrogen plants often require customization to suit specific experimental or operational needs. The systems can be tailored with a variety of custom options. This adaptability ensures that the plant can be configured to accommodate unique applications, whether for scientific research or industrial processes.

● Technological Integration

Modern liquid nitrogen plants are designed to integrate seamlessly with other cryogenic systems and infrastructure. This includes the incorporation of advanced control software, high-density wiring, and cryogenic electronics, enhancing the functionality and precision of the system. The integration of these technologies allows for sophisticated control and monitoring, optimizing the performance and reliability of the plant.

Applications and Benefits

● Versatile Applications

The applications of liquid nitrogen are vast and varied, encompassing fields such as quantum technology, low-temperature physics research, medical sciences, and clean energy. The ability to produce high-purity liquid nitrogen (≥ 98%) on-site eliminates the need for transportation and storage of externally sourced liquid nitrogen, thereby simplifying logistics and reducing costs.

● Environmental and Economic Benefits

Producing liquid nitrogen directly from the air is not only cost-effective but also environmentally friendly. The process significantly reduces the carbon footprint associated with the transportation and handling of liquid nitrogen. The modular and scalable nature of the plant ensures that it can be sited in diverse locations, accommodating various environmental and space constraints.

In conclusion, a liquid nitrogen plant represents a crucial advancement in cryogenic technology, offering a reliable, efficient, and customizable solution for producing liquid nitrogen. Its robust design, ease of maintenance, and safety features make it an invaluable asset across multiple industries, paving the way for innovative applications and sustainable practices in cryogenics.

FAQ about liquid nitrogen plant

How does a liquid nitrogen plant work?

Liquid nitrogen plants are sophisticated systems designed to produce liquid nitrogen through a series of meticulously orchestrated steps. Understanding how these plants operate involves dissecting the processes into their fundamental stages: pre-treatment, cryogenic processing, and the compression/expansion phase.

● Pre-Treatment

The first stage in a liquid nitrogen plant is pre-treatment, where contaminants that could potentially damage the cryogenic equipment are removed. The primary goal here is to eliminate freezable components such as water and carbon dioxide through absorption. Additional impurities like mercury may also be extracted via catalysis. This ensures the subsequent stages operate efficiently without the risk of equipment degradation.

● Cryogenic Processing

Following pre-treatment, the atmospheric air—now purified—is pressurized using a compressor. This pressurized air is then stored in a buffer tank before being directed through a series of high-efficiency filters. These filters further remove any residual impurities, including moisture, which is eliminated by an internal air dryer unit. The next critical component is the Pressure Swing Adsorption (PSA) module, equipped with carbon molecular sieves. These sieves play a crucial role in adsorbing oxygen and carbon monoxide molecules. The PSA module operates with dual adsorption beds that switch between adsorption and purging cycles, ensuring a continuous flow of pure nitrogen gas.

● Compression/Expansion and Cryocooling

The nitrogen gas, now nearly pure, is fed into a cryocooler housed within a cryogenic storage vessel. The cryocooler reduces the temperature of the nitrogen gas to below its evaporation point of approximately -195.8°C (-320°F). This temperature drop transforms the nitrogen gas into its liquid state. A vacuum-heat insulated vessel stores the liquid nitrogen, maintaining its low temperature and purity.

● Efficiency and Safety

The liquid nitrogen plant operates with high efficiency and enhanced safety features. An in-house liquid nitrogen generator offers considerable advantages over traditional tanker deliveries and storage. By generating liquid nitrogen on-site, facilities can drastically reduce costs and minimize their environmental impact. The risk associated with handling large, high-pressure liquid nitrogen tanks is virtually eliminated, as the liquid nitrogen is produced and stored in smaller, low-pressure volumes. This not only enhances user safety but also ensures an uninterrupted supply, critical for applications requiring constant availability.

● Applications and Benefits

Liquid nitrogen plants find extensive applications across various fields. In scientific research, they are indispensable for NMR spectroscopy and X-ray diffraction studies, where maintaining stable, cryogenic conditions is paramount. In IVF clinics, liquid nitrogen is crucial for the storage of biological samples such as sperm, eggs, and embryos. The reliability of an on-site liquid nitrogen generator ensures the safe and consistent preservation of these valuable samples.

For chemical and biological laboratories, these plants offer unprecedented convenience, providing a continuous supply of liquid nitrogen without the logistical challenges of frequent tank replacements. Cold traps in laboratories utilize liquid nitrogen to condense vapor-phase molecules rapidly, enhancing the efficacy of various experimental setups.

● Conclusion

In summary, liquid nitrogen plants are engineered to provide a seamless and efficient method of producing high-purity liquid nitrogen. With components designed to meticulously purify and liquefy atmospheric air, these plants offer an indispensable resource for various scientific, medical, and industrial applications. The integration of advanced safety features and the convenience of on-site production make liquid nitrogen plants an innovative and reliable solution for modern facilities.

What is the working principle of liquid nitrogen plant?

● Introduction

The working principle of a liquid nitrogen plant is a complex yet fascinating process that involves the extraction of nitrogen gas from the atmosphere and its subsequent conversion into a liquid state. The plant employs a series of steps that focus on compressing, cooling, and purifying air to isolate nitrogen, which is then liquefied using advanced cryogenic technology. This process ensures the reliable production of liquid nitrogen, essential for a wide array of industrial and scientific applications.

● Atmospheric Air Compression

The first step in the liquid nitrogen production process is the compression of atmospheric air. Ambient air, which contains approximately 78% nitrogen, is drawn into the plant and compressed to a pressure of about 7 bar using a high-efficiency compressor. This compression process raises the temperature of the air, necessitating the subsequent cooling stage.

● Cooling and Moisture Removal

Once compressed, the air is directed to an external refrigeration system where it is cooled to lower temperatures. This cooling is crucial to reduce the thermal energy of the compressed air, thereby making it easier to handle in the subsequent stages. The cooled, compressed air is then passed through a moisture separator. The moisture separator is effective in trapping any residual water vapor present in the air, ensuring that the downstream processes deal with dry air. This moisture-free air is vital because the presence of water vapor can interfere with the efficient separation and liquefaction of nitrogen.

● Nitrogen and Oxygen Separation

The next phase involves the separation of nitrogen from oxygen and other gases present in the atmospheric air. The dry, compressed air is passed through a bed of carbon molecular sieves, a specialized material that selectively adsorbs oxygen while allowing nitrogen to pass through. This step is pivotal in isolating nitrogen gas, preparing it for the liquefaction stage. The sieves ensure that the nitrogen is of high purity, which is essential for both the liquefaction process and the end-use applications of the liquid nitrogen.

● Liquefaction via Cryocooler

The purified nitrogen gas is then introduced into a cryocooler. The cryocooler is a sophisticated device designed to reduce the temperature of nitrogen gas to its boiling point, which is 77.2 Kelvin (-196°C). Through a series of heat exchange processes, the cryocooler effectively removes thermal energy from the nitrogen gas, causing it to condense into a liquid state. This transformation is the crux of the liquid nitrogen generation process and requires precise control over temperature and pressure to maintain the integrity of the liquid nitrogen.

● Storage and Applications

After liquefaction, the liquid nitrogen is collected in an insulated Dewar vessel. These specialized containers are designed to maintain the extremely low temperatures required to keep nitrogen in its liquid form. The stored liquid nitrogen is then available for a multitude of industrial applications, ranging from cryotherapy and cryopreservation to food processing and scientific research. The reliability of the storage system ensures that liquid nitrogen remains at the necessary low temperatures until it is utilized.

● Conclusion

The working principle of a liquid nitrogen plant involves a meticulously coordinated sequence of compression, cooling, drying, separation, and liquefaction processes. Each step is crucial in ensuring the efficient and effective production of high-purity liquid nitrogen. The use of advanced technologies, such as carbon molecular sieves and cryocoolers, underscores the sophistication embedded in modern liquid nitrogen generators. These plants are indispensable in providing liquid nitrogen for various critical applications, reinforcing their importance in industrial and scientific domains.

How does a liquid nitrogen generator work?



液氮发生器的核心包括几个基本组件:压缩机、净化系统、空气分离装置 (ASU) 和液化装置。 该过程从压缩大气开始。环境空气通过进气口吸入系统,然后使用多级压缩机压缩到高压。这种压缩至关重要,因为它为空气的后续净化和分离做好准备。



空气分离装置 (ASU)

净化后的空气随后被输送到空气分离装置 (ASU),在那里,氮气与其他大气气体被真正分离。ASU 采用一种称为低温蒸馏的工艺。在此,空气被冷却到极低的温度,使其液化。由于氮气、氧气和氩气的沸点不同,因此可以通过分馏将它们分离。在此阶段,液化空气被送入蒸馏塔,沸点较低的氮气上升到顶部,并被收集为高纯度气体。


分离出的高纯度氮气随后被送入液化装置。在此阶段,氮气进一步冷却至沸点 -196 摄氏度(-320 华氏度)。这通常使用涉及热交换器和膨胀阀的制冷循环来实现。然后将得到的液氮储存在隔热良好的低温罐中,以备使用。






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