Industrial technology, China's new technology and new product, compressed air purification system design, Wang Rongsheng (China Metallurgical Alex Hua Tian Engineering Technology Co., Ltd., Jiangsu Nanjing 210019) has a comparison, which has certain guiding significance in optimizing the design of compressed air purification system.
Compressed air is a power source widely applied in industry. It has many good performances and characteristics. Compared with electric power machinery, it can not be replaced in some sectors. Such as wind driven machinery has no sparks and dust in the environment, and also can well operate, and no electric shock risk, suitable for work with great impact and load changes. In the iron and steel industry, the compressed air is also widely used, with the improvement of automation and a large number of foreign advanced equipment, all kinds of valve cylinder, solenoid valve control, automatic instrument and pneumatic tools are being used to make these pneumatic tools, the instrument is reliable, must provide high quality compressed air to to meet the needs of. Therefore, it is necessary to design the compressed air purification system reasonably according to the requirements of the compressed air quality (water, oil, and dust content). In this paper, the low pressure compressed air 0.2MPa<p, p="" purification.<="" 1.2mpa="" the="" in="" discussed="" is="" steel="" and="" iron="" used="" widely="" which="">
The compressed air contains pollutants (water, oil, dust and other harmful gases) in varying degrees because of the internal and external causes of the system. The process of reducing or basic removal of pollutants in compressed air is called compressed air purification.
2, the way of pollutants generation in compressed air is generated outside the system. 2.1.1 water is generated outside the system, which contains more or less steam in air. The content of water in compressed air is related to air temperature and relative humidity. Especially in the southern rainy regions, the compressed air in the water increased significantly, such as when the temperature is 27 and 70% relative humidity, exhaust 3m3/min, exhaust pressure of 0.7MPa compressor, 24 hours from the compressed air, moisture up to 73kg after cooler after processing, and signal and communication equipment should be debugging the key. We should pay attention to applying for the withdrawal of the protection panel so as to avoid the false tripping.
It precipitates about 2/3 of water, but there is still a lot of water left.
2.13, dust in iron and steel enterprises, air compressor stations are mostly set up in the factory area, the atmosphere contains varying degrees of dust (dust, soot, metal powder and so on). These dusts are inhaled during the suction process of air compressors. According to the relevant data, in the industrial area, when the dust concentration is high, it can reach 200mg/m3. If the environment near the suction port of the air compressor is bad, the dust content in the air will be higher and the dust content in the compressed air will also increase.
2.2.1 water, air compressor cooling system leakage, will increase the water content of compressed air.
2.2.2 oil, the oil content of compressed air is produced by air compressor lubricating oil, the piston type air compressor machine oil lubrication, between the cylinder and piston oil lubrication, the compressed air in the oil content is higher, usually around 100mg/m3, high up to 300mg/m3. in the absence of piston type air compressor oil lubricated in between the cylinder and the piston without lubrication, lubricants, fillers, piston ring it with non metallic materials made of self lubrication, and the oil scraper ring is arranged between the crankshaft box and the cylinder, only a few oil into the cylinder, usually compressed air in oil content is 5~15mg/m3. currently widely used screw air compressor. The meshing rotor is generated by the oil film, so the air in the compression process mixed with large amount of oil, although after oil filter, general injection screw air compressor exhaust The oil content in compressed air is high, usually about 20mg/m3.
2.2.3 dust is mainly produced by metal dust from the moving parts of the air compressor and the powder that is lost by the sealing material. The uncleaned solder dust, dust and metal rust can increase the dust content in the compressed air after the installation of the external pipe.
Safe production needs to carry out a good safety responsibility. In this way the maneuverability of the measures can be enhanced. The safety technology management of the two wiring and two debugging in the substation should be fully integrated. Let every employee 3 compressed air pollutants to users harm 3.1 moisture, compressed air water can make all kinds of pneumatic machinery parts rusty, electromagnetic failure, serious or even burn, the cylinder can not act or action is not accurate.
In cold areas, the water may be frozen in the pipeline, and the effect is more serious.
3.2 of the oil, due to the influence of air flow during the compression process, the oil is fine particles and mist, and some of them may generate coke paste and deposit on the inner surface of the pipe wall and the pneumatic machinery, resulting in adverse consequences.
3.3, the dust in compressed air will not only increase the wear of all kinds of pneumatic machines, but also will block the compressed air flow and reduce the flow rate when the dust and water and oil mix up, which will have more serious influence on the electromagnetic valve and pneumatic instrument.
4, the relevant standards for controlling compressed air pollutants are due to the presence of harmful substances such as water, dust and oil in compressed air. Therefore, it is safe and necessary for different households to adopt different quality standards to meet the needs of users. International Standards Association (International Electrotechnical Commission isO and 4eC developed compressed air quality classification in table 1.. In addition, some countries also according to the concrete national conditions to develop appropriate standards, such as the Japanese Industry Association for compressed air pollution control system of air compressor and compressed air use guide will be divided into three kinds, and the