Science and Technology Innovation and Application | August 2012 (Medium) Engineering Technology Research on the daily maintenance of air compressor system Da Yun (Baoshan Iron and Steel Co., Ltd. Cold Milk Sheet Factory Shanghai 2431) based on theoretical research proposed a set of suitable air pressure The daily maintenance method of the machine system has achieved good use effect. It has certain promotion and application value. The air compressor provides dry and clean compressed air for each unit and station in the factory to ensure the normal production of all processes in the whole plant. The production process of compressed air is mainly composed of air filtration, air compression, compressed air drying, and compressed air transportation. That is, the air is sucked into the centrifugal air compressor from the inlet air filter, and then compressed by the compressor in three stages, and then the cooler enters the refrigerating compressed air dryer. The compressed air is cooled and cooled to precipitate the water vapor condensation. The hot regenerative compressed air dryer absorbs the precipitated moisture and finally filters through the dust filter and then exits the dryer into the compressed air storage tank. The new air compressor station in our factory uses self-cleaning filter, centrifugal air compressor and water cooling. The heater and the heating and cooling dryer are used as the core components of the air compressor station.
As a supporting public and auxiliary facility for the milk steel system, we have certain requirements for the quality of compressed air, mainly because the compressed air supply pressure is maintained throughout the period. 62~0.80MPa compressed air dew point 矣 -40 ft. In addition, in order to meet the requirements of energy saving and emission reduction, the cost of compressed air and other auxiliary materials should also be controlled to avoid exceeding the standard. Therefore, how to meet the above requirements, do a good job in the maintenance of the centrifugal air compressor in order to pose a problem in front of us.
Because centrifugal compressors are high-precision products, they also have a corresponding emphasis on the air quality at the entrance. It is generally required that the maximum diameter of the particulate matter in the inlet air be less than 2 microns. For this case, we specially selected a filter with 8 sets of 16 filter cartridges, and the particle throughput was 1 micrometer or less. Only one group or two filter cartridges are allowed to inhale at a time. The sea is replaced by a group for two minutes. At the same time, the filter cartridge that has just been worked on is blown back to blow away the impurities adhering to the filter cartridge, so that it is sucked for the next time. Get ready for the gas. The number of inhaled components (filter cartridges) and the backflushing cycle can be adjusted by the control panel. However, according to the tracking of a period of time, we found that the filter cartridge is filtered by the filter cartridge. The general effect is our inhalation in the outdoor outdoors. More impurities, once a larger diameter of the particles are sucked into the filter cartridge, may cause the filter cartridge to block, although these impurities can not finally pass through the filter cartridge, but this may cause the air compressor to inhale difficult and frequently fix the filter cartridge for the station In terms of cost, it is also a large burden. The main body of the air compressor needs to pay attention to it, but it is mainly divided into vibration, lubricating oil, sealing, current value and temperature.
3.1 The detection of vibration is mainly divided into two categories: First, the inspection company will do a comprehensive test for us every three months to issue a vibration report that is specific to ensure that the vibration value is within the range. Second, we observe the two vibrations (online data) of the high speed shaft and the low speed shaft. When the vibration value exceeds 20, it is necessary to pay attention to the method of deep cleaning the impeller to eliminate the carbon deposit on the impeller and the possible particles. If the vibration value is still large after cleaning the impeller, it is mainly possible that the dynamic balance of the shaft is destroyed. At this time, it is necessary to debug the dynamic balance with the special maternity leave.
3.2 Lubricating oil testing is also divided into two categories: First, the testing company will do a comprehensive inspection for us every three months to issue a specific oil sample report to ensure that the oil sample meets the requirements for use. The second is that we can visually check whether the lubricating oil has turbid solidification and other pollution. Lubricating oil is very important for the air compressor to develop the habit of regularly changing the oil filter. The filter is the first job to ensure that the lubricating oil is not polluted normally. If the machine vibrates too much, it will cause damage to the equipment. Once the contamination occurs through visual lubrication, the same type of lubricant is immediately fixed and the tank is cleaned before the lubricant is replaced. Use special refueling tools to avoid grease contamination. For painting other types of lubricants, be sure to first check the manufacturer's product specifications. The selected lubricants are selected according to the instructions to avoid corrosion of the internal rubber parts.
3.3 The sealing property is extremely important for the air compressor. The sealing air is not good. The compressed air produced by the factory will be leaked out, which directly affects the gas production. The pipe network pressure and the temperate pressure gas simultaneously patrol the station. The safety of the inspectors is also a great danger. The most common parts of the air compressors that leak easily are those that use rubber seals. Because these rubber seals have been subjected to high temperature and high pressure for a long time, they are prone to embrittlement. Therefore, the compressed air leaks goose according to the manufacturer's instructions suggest that such rubber dense lif ring should try to change every year.
3.4 Current value The operation of the air compressor and its state can be observed from the other side. The above figure reflects the relationship between the IGV opening flow and the system pressure, and also indicates the surge region.
3.5 Temperature, various types of coolers on the air compressor body have oil coolers, intercoolers and aftercoolers. If the cooler is in a bad state, the following consequences will result: the temperature is too high, the outlet temperature is too high, and the temperature of the head is too high. The equipment is frequently alarmed and the continuity of the production is not good, which affects the subsequent power supply. The service life of the condenser is shortened, the equipment load is increasing, the service life is shortened and the energy consumption is increased. 4 The outlet air temperature is high. The gas is cooled in the gas storage tank. The air pressure will drop and the quality of the gas will drop. I use the oil for a long time under high temperature conditions, which will cause the oil quality to decrease and the slip effect will decrease. It is easy to carbonize the dust and rust in the air after the aftercooler to form carbon deposit and then increase safety. Hidden dangers. Therefore, it is very important to ensure the cooling effect of the cooler. According to experience, it is better to perform a physical cleaning of the cooler before the summer to remove the impurities in the heat exchange tube, to ensure the smooth flow of the heat exchange tube, and to make the flow of the cooling water as much as possible. The design requirements are met, but the rise in age is simple. Physical cleaning has not met the requirements. The scale on the inner wall will become thicker and thicker, resulting in lower heat exchange efficiency, higher gas temperature and water temperature.
In addition, the inter-turn cooler and the after-cooler can easily bring out a large amount of moisture in the air during the cooling process of the compressed air. The maintenance of the water is often required to pay attention to this part of the water goose. According to the case provided by the manufacturer, if the water in the cooler is To a certain extent, it may cause the impeller to rise and the system self-protection tripping is extremely disadvantageous for the entire compressed air system. Therefore, we installed an automatic drain valve to drain the water in the cooler. We also added a manual valve on the bypass to allow water to ensure safe and stable operation of the equipment.
Compressed air system as a pressure-containing system, gas storage tanks, safety valves, pressure gauges and other components are essential to ensure the safety of the entire system. In routine maintenance, it is necessary to periodically check and replace such equipment. In all kinds of maintenance, we must also pay attention to pressure relief; 62~ 0.80MPa may also cause harm to the human body.
On the basis of a large number of field experiments and theoretical studies, a set of intermediate thickness calculation model of cold tandem mill was proposed by using the relevant principles of Newton iterative method, and applied to the initial intermediate thickness of 1220 cold strip mill of Baosteel Cold Milk Sheet Plant. The setting has a good effect on the field and the relevant precision is over 90%. It fully meets the precision requirements of the project and has the value of further promotion and application.
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