An Innovation of Compressor Air Compressed Air Purification System Qu Zongchang, Feng Jian (Compressor Research Institute, Xi'an Jiaotong University, Xi'an 710049, China), a complex physicochemical reaction to convert oil, water and dust present in compressed air grain. Its long working life and reliable performance enable any compressed air to exceed the first-order gas quality index of ISO8573-1, achieving an absolutely oil-free gas standard.
1 With the advancement of science and technology and the continuous improvement of people's living standards, higher requirements are placed on the quality of compressed air in the industrial, medical and food industries. The state has also developed corresponding standards (GB/T1327791 is generally used). Compressed air quality level), the quality of compressed air is assessed according to different industry characteristics. The three major tasks of the air purification system are dehumidification, degreasing and dust removal. In order to solve the oil and gas, water mist and particulate impurities in the compressed air, scientists and technicians in various countries have made unremitting efforts for many years.
The "International Oil-free Compressed Air Innovation Conference" held in Munich is a communication and summary of results. Thirty-one representatives from 12 countries including China, Germany, the United States, Italy, Japan, Norway and Austria attended the meeting. The meeting exchanged and discussed the current clean air treatment technology. Dr. StefanZETTL of ROTORCOMP and technical engineer ochen BROWA gave a special report on ROTORCOMP's newly developed EcoTec (referred to as ETC) oil-free converter technology. ETC technology is a breakthrough in the field of air purification. It is a revolutionary innovation in compressed air treatment methods, setting new standards for compressor reliability, low cost maintenance and environmental protection.
2 Purification method of compressed air At present, the compressed air provided by domestic compressors (except the general workshop gas) can not meet the GB/T13277-91 quality standard, the moisture in the compressed air and the lubricating oil contained in the higher exhaust At the temperature, it is generally in a gaseous state, and then mixed with the inhaled dust to form impurities of oil, water, and dust mixture. These impurities not only make the quality of food and medicine products difficult to guarantee, but also cause damage to the air source device and the pneumatic system. .
First, the organic acid formed by the gasification of the oil corrodes the equipment, causing the relative moving surface of the pneumatic component to wear, causing the control element to malfunction, and an air purification system must be provided for this purpose. There are two traditional methods for obtaining purified compressed air in China: one is to directly use an oil-free compressor, and then the adsorption dryer; the other is to use an oil-lubricated compressor, and a filter is arranged on the system, and the drying is performed. And purification filters. The first method puts high demands on the design and manufacture of the compressor itself, and its design and manufacturing cost will be greatly increased. In addition, the service life of the consumable parts of the compressor is significantly reduced, about 50% of the oil-lubricated compressor. The friction and wear are intensified, the leakage is increased, the volumetric efficiency is lowered, and the maintenance cost of the compressor is increased. So most of the second method is used.
Detailed comparisons were made between life, compressor energy consumption, maintenance costs, and manufacturing costs. It is apparent from the specific data enumerated that the second method is far superior to the first method. The second method has no special requirements for the compressor itself. The key is to choose a purification system. It usually uses mechanical separation filtration and freeze drying, and then adsorption of activated carbon to separate oil, water and impurities from compressed air. Come out, but this method often needs to change the filter, and the effect is often not ideal. In particular, the dryer will be affected by many factors, such as the working pressure of the system, the exhaust temperature of the compressor, the flow of the gas, the temperature of the environment and the dew point of the lowest pressure. The working life and efficiency of the filter also directly affect the filter. Purification of compressed air Ifet shows the working life and efficiency of the active filter. It can be seen from the figure that when the working time is greater than 1000h, the filter has basically lost its effect. So far, there is no perfect and reliable treatment method in the field of compressed air purification systems. In response to this situation, the German ROTOR-COMP company has recently developed a new technology for the EcoTec screw compressor oil-free converter (referred to as ETC converter), which has made a breakthrough in the compressed air purification system.
The working principle of the anisotropic catalyst in 3ETC ETC technology uses a special anisotropic catalyst (as shown), which is a porous, permeable solid material that increases the speed of chemical reactions. It has a surface area of ​​200m2/g. The catalyst in the ETC oil-free converter provides 600,000m2 of surface area for compressed air of 1m3/min0.7MPa. On this surface area, any oil-containing compressed air can be quickly Ground treatment.
The structure of the catalyst is different from the traditional method of adsorption of activated carbon. The ETC technology is a complex physical and chemical reaction to convert the oil and trace gases present in the compressed air. The process or steps of its reaction are as shown. After the oil, water and dust particles from the compressed air enter the catalyst reaction tank, they are absorbed by the anisotropic catalysts by chemical and physical action, and the absorbed substances are then single-molecule and double with the gas phase and the oxygen atoms outside the catalyst. Molecular action, and then the final separation of CO2 and water, the activated energy to desorb the catalyst, the catalyst regeneration is ready for a new cycle. The chemical equation of the reaction is expressed as a schematic diagram of the reaction process. The time required for the above catalytic reaction is usually 0.5 s. The "contact time" designed by ROTORCOMP in the ETC oil-free converter is 1.7 s and the ETC oil-free converter is added. The reliability of the work.
After this ETC oil-free converter, all hydrocarbons, impurities and CO are eliminated. The content of oil and hydrocarbon in compressed air is <0.003mg/m3, ie compressed air is absolutely oil-free.
ETC oil-free converters can be used without any restrictions in all compressed air applications requiring oil-free purification. The efficiency and working life are not affected by the oil content of the compressed air, the operating temperature and the humidity of the ambient air. ROTORCOMP offers The quality assurance is up to 15000h. Currently, this ETC oil-free converter has been used in some famous food and pharmaceutical companies in Europe.
The working process of the 4ETC oil-free converter receives the interaction between the catalyst and the catalyst (live and the compressed air gas source of gblishi5us(1) is subjected to air preheating heat exchange book1 to give the working process of the ETC oil-free converter. It consists mainly of three main parts: air preheating heat exchanger, catalyst reaction tank and dryer. The process is as follows: the generator (2) is preheated and then enters the converter barrel containing the granular catalyst. In the body (3), an electric heating device is provided in the barrel of the converter, which is used to maintain the operating temperature necessary for the converter to purify the compressed air, and the temperature is generally about 140 to 170 C. When the compressed air passes through the converter, The contained hydrocarbon is oxidized by the special catalyst under the physicochemical reaction. The purified compressed air is exchanged with the gas from the compressor gas source through the air preheating heat exchanger to ensure that it will be purified. The temperature of the gas source is close to the temperature required by the reaction tank, and the temperature of the purified gas is also lowered. The quality of the compressed air after the ETC oil-free converter is far superior.
5 Conclusion The special dissimilar catalyst purification technology completely replaces the traditional purification system, making the purification problem of compressed air simple and reliable. Its reliability and long working life (up to 15000h quality assurance) and maintenance-free convenience make it possible to achieve the ISO8573-1 first-class gas standard regardless of the compressed air.
The effect and working life of the ETC oil-free converter are not affected by the oil content of the compressor exhaust, operating temperature and ambient air humidity, and can always be operated efficiently and without maintenance.
Its development has ensured reliable assurance of the food, pharmaceutical and automatic control industries as well as other applications where gas quality requirements are critical. At the same time, this treatment method not only protects the environment, but also saves the traditional air treatment and maintenance costs. It fully integrates the C-class, T-class, A-class and H-class four-stage filtration and purification functions currently used in the domestic market, so An innovation in the field of air purification is also an inevitable development direction.
Packing Bag,Vacuum Pack Bags,Vacuum Seal Storage Bags,Packing Bags For Clothes
Jiangmen Yingzhihui Electronic Commerce Co., LTD , https://www.jmyzhprint.com