Compressed air purification system design

Industrial Technology China New Technology and New Products Compressed Air Purification System Design Wang Rongsheng (Zhongye Huatian Engineering Technology Co., Ltd., Nanjing 210019, Jiangsu, China) has a certain guiding significance in optimizing the design of compressed air purification system.

Compressed air is a power source widely used in industry. It has many good properties and characteristics. Compared with electric machinery, it cannot be replaced in some sectors. For example, the pneumatic machine has the function of not generating sparks and being in a dusty environment, and can operate well without electric shock, and is suitable for work with large impact and load changes. In the steel industry, compressed air has also been widely adopted. With the improvement of automation and the use of a large number of foreign advanced equipment, various solenoid valve controlled cylinders, valves, automatic instruments and pneumatic tools are also being used more and more. In order to make these pneumatic tools and instruments reliable, high-quality compressed air must be provided to meet the needs. Therefore, according to the user's requirements for compressed air quality (water, oil and dust content, it is necessary to design a compressed air purification system reasonably. This paper only applies low pressure compressed air 0.2MPa widely used in the steel industry.

Compressed air contains pollutants (moisture, oil, dust and other harmful gases) to varying degrees due to various reasons inside and outside the system. The process of reducing or substantially removing pollutants in compressed air is called compressed air purification.

2 Contaminant production in compressed air 2.1.1 water is generated outside the system. Water is more or less contained in the air. The moisture content in compressed air is related to air temperature and relative humidity. Especially in the rainy and humid areas of the south, the moisture in the compressed air is obviously increased. For example, when the temperature is 27, the relative humidity is 70%, the displacement is 3m3/min, and the exhaust pressure is 0.7MPa, the compressor discharges compressed air for 24 hours. The water content of up to 73kg after the post-cooler treatment, and signal, communication equipment, etc. should be the focus of debugging. Pay attention to the application for the protection of the platen to avoid false tripping.

About 2/3 of the water is precipitated, but there is still a lot of water left.

2.13 Dust, in the iron and steel enterprises, most of the air compressor stations are located in the factory area, and the atmosphere contains various kinds of dust (dust, soot, metal powder, etc.), which are sucked in the air suction process of the air compressor. According to relevant information, when the concentration of dust in the atmosphere of the industrial zone is high, it can reach 200mg/m3. If the environment near the air inlet of the air compressor is bad, the dust content in the atmosphere will be higher, and the dust content in the compressed air will also be increase.

2.2.1 Moisture, when the air compressor cooling system leaks, it will increase the water content in the compressed air.

2.2.2 oil, the oil content in compressed air is produced by air compressor lubricating oil. In the oil-lubricated piston air compressor machine, the oil content in the compressed air is lubricated by the oil between the cylinder and the piston. Higher, usually about 100mg/m3, high up to 300mg/m3. In the oil-free piston air compressor, the cylinder and the piston are lubricated without lubricating oil, and its packing and piston ring are self-lubricating. Made of non-metallic materials, and there is a scraper ring between the crankshaft connecting rod box and the cylinder. Only a small amount of oil enters the cylinder. Usually, the oil content in the compressed air is 5~15mg/m3. The spray is widely used at present. The oil screw air compressor, the mesh between the male and female rotors is generated by the oil film, so the air is mixed with a large amount of oil during the compression process. Although the oil filter filters, the oil content of the compressed air discharged from the air jet screw air compressor is generally Higher, usually around 20mg/m3.

2.2.3 Dust, mainly metal dust generated by moving parts of air compressors, powders from which sealing materials fall off, etc. Uncleaned weld debris, dust and metal rust after external piping installation can increase the amount of dust in the compressed air.

Safety production requires the implementation of safety responsibilities. This makes the operability of the measures enhanced. The safety technology management of secondary wiring and secondary commissioning in substations should be comprehensive and comprehensive. Let each employee 3 compress the pollutants in the air to the user's hazard 3.1 water, the moisture in the compressed air can rust various pneumatic mechanical parts, electromagnetic action is out of order, serious or even burned, the cylinder can not move or move Accurate and so on.

In cold regions, water may freeze in the pipeline, causing more serious effects.

3.2 oil, due to the air in the compression process, under the influence of high-temperature air movement, the oil is in the form of fine particles, and some may generate tar paste and deposit on the inner surface of the pipe wall and the pneumatic machine. Causes adverse consequences.

3.3 Dust, dust in compressed air will not only increase the wear of various pneumatic machinery, but when the dust is mixed with water and oil, it will block the compressed air flow channel and reduce the flow, which will have more serious impact on the solenoid valve and pneumatic instrument.

4 Relevant standards for controlling compressed air pollutants Due to the presence of harmful substances such as moisture, dust and oil in different degrees in compressed air, it is necessary to meet different user requirements according to different quality standards. The International Standards Association (ISO and International Electrotechnical Commission 4eC developed compressed air quality classification as shown in Table 1. In addition, some countries have also developed corresponding standards according to their specific conditions, such as the Japan Compressed Air Industry Association air compressor and system pollution control guidelines The use of compressed air is divided into three types, and corresponding pollution control standards are proposed.

In 1991, China formulated the national standard GB/T13277-91 for the general compressed air quality grade. The standard compressed air quality classification is shown in Table 2. When designing the compressed air purification system, we should try our best to select the purification equipment according to relevant standards. Meet the requirements of different users for compressed air quality.

Actively participate in the work to strengthen their sense of responsibility and crisis awareness to ensure the correctness and safe operation of each step of each process. Therefore, the quality of the installation and commissioning of the substation is good, which is conducive to safe and reliable operation in the future and promotes the better development of the Duhui economy.

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