The cryogenic air separation nitrogen making machine is a traditional nitrogen production method, which has a history of recent decades. It takes air as raw material, after compression, purification, and then heat exchange to liquefy the air into liquid air. Liquid-air is mainly a mixture of liquid oxygen and liquid nitrogen, using the different boiling points of liquid oxygen and liquid nitrogen, through the distillation of liquid-air, so that they are separated to obtain nitrogen.
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Cryogenic Nitrogen Production Plant
Cryogenic Nitrogen Plant, also named industrial cryogenic nitrogen generator is a compact and highly efficient system that produces nitrogen with 99.99% purity level. It can produce from 80 to 3,500 Nm3/hr. of nitrogen gas or even more.
No need for raw materials or recurring chemical costs, Cryogenic Nitrogen Plant uses a cost effective process to produce pure nitrogen gas from the atmosphere. As an experienced industrial cryogenic nitrogen generator manufacturer, uses advanced and state of the art technology in every process.
The equipment for producing oxygen by cryogenic method has the following characteristics
- Low temperature containers and pipelines such as low-temperature heat exchangers and distillation towers are placed in a cold insulation box and filled with insulation materials with low thermal conductivity to prevent heat from entering from the surroundings and reduce cold loss, otherwise the equipment cannot operate;
- Materials used for manufacturing low-temperature equipment are required to have sufficient strength and toughness at low temperatures, as well as good welding and processing performance. Commonly used materials include aluminum alloys, copper alloys, stainless steel, etc;
- Impurities with high boiling points in the air, such as moisture and carbon dioxide, should be removed in advance at room temperature. Otherwise, it will block the channels inside the equipment, making the device unable to work;
- Acetylene and hydrocarbons in the air enter the air separation tower and accumulate to a certain extent, which can affect safe operation and even cause explosion accidents. Therefore, purification equipment must be installed to remove it;
- A sealed container for storing low-temperature liquids. When heat is transferred from the outside, some of the low-temperature liquids will absorb heat and vaporize, and the pressure will automatically increase. To prevent overpressure, reliable safety devices must be installed;
- If low-temperature liquid leaks into the foundation, it will freeze and crack the foundation, causing the equipment to tilt. Therefore, it is necessary to ensure the sealing of equipment, pipelines, and valves, taking into account the stress and deformation that may occur due to thermal expansion and contraction;
Porous organic substances such as wood and coke soaked in liquid oxygen can undergo intense combustion when exposed to a fire source or subjected to a certain impact force. Therefore, porous organic substances are not allowed inside the cold box. For the discharge of liquid oxygen, specialized liquid oxygen discharge pipelines and containers should be considered in advance, and it is not allowed to use underground trenches;
Long term impact of low-temperature liquids on carbon steel plates can cause them to become brittle and crack. Therefore, carbon steel products cannot be used for pipelines and discharge tanks that discharge low-temperature liquids; - Nitrogen and argon are suffocating gases, and their liquid discharge pipes should be led outdoors. The gas discharge pipe should have a certain discharge height, and the discharge outlet should not face the platform staircase;
- Oxygen is a strong combustion enhancer, and its discharge pipe cannot be directly discharged into an unventilated factory building.
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Cryogenic Nitrogen Plant
cryogenic nitrogen plant is one of the most revolutionized machinery which is also known as industrial cryogenic nitrogen generator. cryogenic nitrogen plant is a very compact and widely known as a very efficient system which produces nitrogen at a purity level of 99.99%. As one of the most sophisticated industrial machinery, it can produce nitrogen gas at an output ranging from 80 to 3,500 Nm3 per hour or even more.
cryogenic nitrogen plant uses one of the most cost effective processes in producing pure nitrogen gas coming from our atmosphere. Using cryogenic nitrogen plant, raw materials will not be necessary and there will be no need for recurring cost of chemicals. As one of the leading company in the industry, cryogenic nitrogen plant uses one of the most advanced machinery and state of the art technology in every purification process.
cryogenic nitrogen plant is one of these industries famous machinery designed and employed to produce nitrogen for different industrial applications. cryogenic nitrogen plant uses the process of cryogenic distillation in producing pure nitrogen in the cryogenic nitrogen plant.
The plant produces nitrogen using the process of liquefaction of the air from the atmosphere using the air separation unit. The next step is running the air through the cleanup system in which the impurities contained in the nitrogen such as the moisture and carbon hydrogen are eliminated. After that, the air moves through the heat exchanges and in here is where the purified air is cooled in cryogenic temperatures. The next process is when the air is moved through the column of high pressure distillation where the separation process happens. In this column is where the nitrogen is formed. Finally the purified nitrogen is directed into the column of low pressure distillation where the nitrogen is distilled. The final product is further processed in order to meet the commercial specifications.
cryogenic nitrogen plant produces purified nitrogen, an element which has great technical importance. The atmosphere is known to mainly consist of oxygen and nitrogen gases with small quantities of carbon dioxide, helium, argon, and more. Using cryogenic nitrogen plants, the oxygen and nitrogen are separated due different processes done by the company’s top notch machinery.
nitrogen generation systems are certified to be very safe and reliable. Other than that, top experts confirmed that the company machineries are both easy to operate and maintain. Depending on the costumer’s needs, there are several options available.
cryogenic nitrogen plants are designed by the most elite engineers and experts of the company to become one of the most globally competitive sophistication. The plant is fabricated and manufactured using the international standards as basis. cryogenic nitrogen plants are manufactured and created using the latest cutting-edge technology and sophisticated design. The machines which generated nitrogen are designed superbly and priced competitively.
cryogenic nitrogen plant produces top quality machinery which are second to none because of the strict quality control and standard measures which are maintained at ’s company.
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The main equipment included in the cryogenic nitrogen generator unit
Air filtration
To reduce the wear and tear on the mechanical surfaces inside the air compressor and ensure air quality, the air must first pass through an air filter to remove dust and other impurities before entering the air compressor. Air compressors often use coarse or medium efficiency filters for intake.
Air compressor
According to the working principle, air compressors can be divided into two categories: volumetric and velocity compressors. Air compressors commonly use reciprocating piston air compressors, centrifugal air compressors, and screw air compressors.
Air cooler
It is used to reduce the temperature of the compressed air before entering the air dryer and air separation tower, avoid significant temperature fluctuations in the tower, and can release most of the moisture in the compressed air. Usually, nitrogen water coolers (consisting of a water cooling tower and an air cooling tower: the water cooling tower uses the exhaust gas from the air separation tower to cool the circulating water, and the air cooling tower uses the circulating water from the water cooling tower to cool the air) and Freon air coolers are used.
Air drying purifier
Compressed air still contains some moisture, carbon dioxide, acetylene, and other hydrocarbons after passing through an air cooler. The frozen moisture and carbon dioxide deposited in the air separation tower can block channels, pipelines, and valves. Acetylene accumulates in liquid oxygen and poses a risk of explosion. Dust can wear down operating machinery. In order to ensure the long-term safe operation of the air separation unit, specialized purification equipment must be installed to remove these impurities. The most commonly used methods for air purification are adsorption and freezing. Molecular sieve adsorption method is widely used in small and medium-sized nitrogen generator units in China.
Air separation tower
The air separation tower mainly includes a main heat exchanger, liquefier, distillation tower, condensing evaporator, etc. The main heat exchanger, condenser evaporator, and liquefier are plate heat exchangers, which are a new type of composite wall heat exchanger with an all aluminum metal structure. The average temperature difference is very small, and the heat transfer efficiency is as high as 98-99%. Distillation tower is an equipment for air separation, and the types of tower equipment are divided according to their internal components. A sieve tray tower is called a sieve tray tower, a bubble cover tower is called a bubble cover tower, and a packed tower is called a packed tower. The sieve plate has a simple structure, is easy to manufacture, and has high tray efficiency, so it is widely used in air separation distillation columns. The packed tower is mainly used for distillation towers with a diameter of less than 0.8m and a height of no more than 7m. Bubble cap towers are rarely used due to their complex structure and manufacturing difficulties.
Turbine expander
It is a rotary blade machinery used in nitrogen production equipment to generate cooling capacity, and is a gas turbine used under low-temperature conditions. Turboexpanders are divided into axial flow, radial flow, and radial axial flow according to the flow direction of gas in the impeller; According to whether the gas continues to expand in the impeller, it can be divided into counterattack type and impact type. Continuing expansion is called counterattack type, while not continuing expansion is called impact type. Single stage radial axial flow impact turbine expander is widely used in air separation equipment. The cryogenic air separation nitrogen generator equipment is complex, occupies a large area, has high infrastructure costs, requires a large one-time investment in equipment, has high operating costs, produces gas slowly, has high installation requirements, and has a long cycle. Taking into account factors such as comprehensive equipment, installation, and infrastructure, the investment scale of PSA units with the same specifications for equipment below 3500Nm3/h is 20% to 50% lower than that of cryogenic air separation units. The cryogenic nitrogen generator is suitable for large-scale industrial nitrogen production, while medium and small-scale nitrogen production appears uneconomical.