Since the first 150m 3 / h air separation plant was born, its supporting air compressor and oxygen compressor have become two important parts in the supporting equipment. The function of the air compressor is to supply the raw material air. The function of the oxygen compressor is to charge the oxygen from the rectification tower into a 15 MPa oxygen cylinder. In addition to the considerable value of the air compressors and air compressors, the air compressors and oxygen compressors are difficult for users. The problems caused by electric equipment are high failure rate, large equipment maintenance workload and some safety hazards. Therefore, how to maintain these two devices and improve their operational performance has become a common concern of users and manufacturers. After years of hard work, with the continuous improvement of the Air Separation Equipment process, the air compressor has been developed from the early power L-type oil-lubricated compressor to the vertical oil-free compressor now equipped for air separation equipment. The press is also changed from water lubrication to a waterless, high purity compressor. 1 Type of air compressor 1 1 L-type oil-lubricated air compressor The earliest air separation equipment is equipped with L-type oil-lubricated air compressor, which is a general-purpose power compressor with simple structure and cost. Low and small footprint. This option was only available at the beginning, as no other models are available. However, with the increase in the requirements of the air separation process, this type of machine reveals more and more deficiencies, mainly: the compressed gas is oiled, which requires subsequent degreasing equipment, and the whole set. The safety of air separation equipment also poses a threat; this air compressor is extremely unsuitable for the continuous long-term operation of air separation equipment, because the design of the whole unit is relatively simple, such as the cylinder is not integral, the water chamber and the air chamber must be Sealing with gaskets increases the possibility of leakage; due to the position limitation of the intercooler, the heat transfer effect is often unsatisfactory, especially in the case of oil, which tends to cause carbon deposition, which further reduces the cooling effect and leads to temperature. Ascending, the resulting pipeline explosions and burning accidents often occur; the synchronous motors of the unit and the heavy lifting cabinets often fail. In short, this type of air compressor has a high failure rate and must find another way out. 1 2 Symmetric Balance Air Compressor In the 1980s, Hangzhou Oxygen Generator Group developed the first 2D8 17/ 45 oil-free lubrication air compressor in China to replace the L-type oil-lubricated air compressor. The structure is a horizontal two-row four-stage compression symmetric balance type. Due to the oil-free lubrication, the compressed air is very clean. At the same time, the design ensures the stable and reliable operation of the unit, so it is very popular in the market. Most of the 150m 3 / h air separation equipment manufactured at that time used this unit. However, due to the design pressure of 45 MPa, the positioning is too high, and the structure is excessively reliable, making the whole unit appear relatively large, covering an area of ​​40 m 2 and the manufacturing cost is quite high. At the same time, in the actual use in the future, some problems are also exposed: because it is a horizontal structure, the first, third, second and fourth stages adopt the step difference type. If the cooling water is improperly controlled during operation, the cylinder is likely to accumulate condensed water, resulting in a fast piston ring. Wear and tear, the life of the cylinder liner is also shortened accordingly, so the operation and maintenance requirements are high. At that time, the user believed that the unit was expensive to use. 1 3 vertical oil-free lubricating air compressor In order to improve the safety of air separation equipment, the original L-type oil-lubricated air compressor is oil-free. There are roughly two ways to transform it: one is to directly replace the piston ring with Self-lubricating material without lubricating oil, no oil or small amount of oil in the cylinder, but the problem is that some oil in the moving mechanism will inevitably enter the cylinder. The other is to add a middle seat between the cylinder and the fuselage to completely isolate the oil in the crankcase. However, this type of modification has more parts and larger changes, which must be done by professional manufacturers. Even though the above transformation method is only focused on? Oil (the problem does not change the original defects of the unit such as excessive exhaust gas temperature, but because the input cost is very low, it still has a certain impact. Professional manufacturers do not support the transformation of this practice, the air compressor is once again Faced with a new generation. Subsequently, the first vertical three-row three-stage oil-free lubricating air compressor manufactured by Hangzhou Oxygen Generator Group Co., Ltd. was successfully operated in Jiangsu Zhenjiang Oxygen Factory, becoming the most advanced and widely used model in China at that time. The speed of this model is 590r/min, and its main feature is to avoid the various drawbacks of the above air compressor. The design fully considers the characteristics of stable, reliable and continuous operation required by air separation equipment. It is equipped with stainless steel mesh valve, high efficiency scraper and sealer. The cooler adopts copper finned tube and has good heat exchange effect. And there is enough buffer volume, so that the whole unit has low vibration and low noise. The unit completely overcomes the common phenomena such as water leakage, oil leakage and gas leakage during the operation of the general air compressor and serious safety hazards such as explosion. In addition, since there is no horizontal reciprocating member, the eccentric wear phenomenon of the piston (ring) does not occur, and condensed water is not accumulated, thereby greatly increasing the service life of the wearing part. At the same time, the floor space is small (about 15m 2), easy to operate and maintain, and the price is moderate. The unit has so far been the preferred air compressor for medium-pressure flow 150m 3 / h air separation plants. In order to better meet the needs of users, the manufacturer has formed a series of products to choose from. The final pressure is 2MPa and 3MPa, which can replace other air compressors in the old air separation plant; the flow rate is 1020m 3 / h and 1140m 3 / h, sufficient gas supply, ensure that the oxygen output is greater than 180m 3 / h; the motor can be equipped with 380V or 6000V, which is customized by the user. With the development of air separation plant process, low-pressure processes have been used in small air separation plants that are now being designed and put into production. Correspondingly, Hangyang has developed an air compressor of the type ZW 22/7 with a flow rate of 1320 m 3 / h and a pressure of 0 7 MPa. The structure is still vertical and adopts two rows of secondary compression and high efficiency coolers. The unit not only has various advantages of vertical models, but also has further improvements in terms of machine stability, vibration and noise reduction, and its performance parameters have reached the domestic advanced level. 2 type of oxygen compressor 2 1 water lubrication oxygen compressor 150m 3 / h air separation equipment production of oxygen is mostly used to fill the 15MPa oxygen cylinder. The earliest oxygen compressor was imported from foreign imported equipment, and the national unified mode, model 2 1 67/ 150 (reformed to 3Z3 5 1 67/ 150), vertical three-column three-stage, water lubrication in the cylinder, The exhaust pressure is 15MPa. The final pressure is 15MPa only after three-stage compression, so the average compression of each stage is relatively large (about 5 5), and the temperature inside the cylinder after heat insulation is more than 220), because it is difficult to find a suitable temperature. The wear-resistant non-metallic material is used as the piston ring, and the water lubrication in the cylinder becomes the only choice. The water improves the friction condition between the piston ring and the cylinder, and at the same time takes away a lot of friction heat, and has the function of cooling and cooling. This model has been a fixed model for filling oxygen cylinders for quite some time, and even some improved oxygen compressors are still being used. its The features are simple structure, good versatility of parts (almost all drawings used by manufacturers), low price and small footprint. However, the fatal defect of this model is also caused by water lubrication, and the accident that causes the combustion of the cylinder to rise sharply due to water cut often occurs. According to incomplete statistics, there are 12 accidents in every 10 such machines in the long-term operation. The main reason for the burning is the rust and welding slag in the water or airway. Since lubricating water is added to the oxygen, the compressed gas is separated by water and then filled into an oxygen cylinder. However, the effect of separation under such high pressure is often unsatisfactory, so that the oxygen bottle contains excessive free water, sometimes even meeting the minimum requirements of the GB 3863 national standard. 2 2 Oil-free and anhydrous oxygen compressor In this case, Hangzhou Oxygen Generator Group Co., Ltd. developed 2Z2 3/ 165 oil-free and anhydrous oxygen compressor, which uses 5-stage compression to reduce the compression ratio of each stage. The exhaust gas temperature (in the cylinder) is lower than 165), and the exhaust pressure is increased to 16 5MPa, and the flow rate is 180m 3 / h. In terms of material selection, each stage is provided with a stainless steel cylinder liner, and all pipes in contact with oxygen are made of stainless steel. It is equipped with an interstage tube cooler. The control side has increased the side cabinet, and has alarm and interlocking devices for oil pressure, exhaust temperature and final pressure, thus ensuring the safe operation of the equipment. Because the unit is a vertical two-column five-stage differential structure, the manufacturing and installation requirements are relatively high, and the concentricity between the cylinders has been adjusted in strict accordance with the technical requirements in the manufacturing plant. The user should press according to the technical requirements. The positioning pin is reset. Especially when the user replaces the parts after using for a period of time, it is more important to ensure that the various assembly gaps meet the requirements of the drawings and specifications. Since the oil-free and non-lubricated bottle-filled oxygen compressor has completely changed the water content in the oxygen cylinder, it has improved the service life of the oxygen cylinder and also provided the user with dry, pure oxygen. In addition, in order to meet the needs of users to replace the water and oxygen compressor with an anhydrous oxygen compressor, a new three-row five-stage vertical oil-free oxygen-free oxygen press has been introduced, which can be directly replaced by the user's original foundation. ,Very convenient. 3 Conclusion With the continuous development of small air separation equipment technology, the air compressor and oxygen compressor matched with it have been continuously improved and improved in terms of structure, performance and operational safety, and the failure rate of equipment is reduced. Reduced, the quality of the gas products produced is improved. 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