The Ding 1500 centrifugal air compressor used by Zhejiang Shaotao Glass Co., Ltd. air separation station was developed by Korea Xinghua Company. The unit adopts the motor-driven three-stage integral gear type, the component-stage compression element is composed of the impeller diffuser volute and the end cover, the impeller is sleeved on the high-speed shaft, and the high-speed shaft is driven by the large gear driven by the main motor; It is placed on each side of the left and right sides of the large gear. The large and small gear shafts support the axial and radial forces by the tilting pad thrust bearing. The impeller and the bearing are separated by the gas seal and the oil seal to achieve the non-defective compression. The vibration level of each stage of the compressor. temperature. Pressure, parameter é‚¡ 认 认 控制 认 认 æŸ æŸ æŸ æŸ æŸ æŸ æŸ è®¤ 认 认 认 认 认 认 èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒ èŒSome of the defects have had a definite impact on the production of air separation equipment. 1 The grid voltage fluctuates drastically, causing the air compressor to stop. Due to the overvoltage protection and undervoltage protection on the control cabinet of the high voltage motor high voltage cabinet of the centrifugal air compressor, the system voltage fluctuation exceeds the overrun protection parameter to be lower than the undervoltage protection. The parameter, its protection interlock device will act, which will cause the air compressor to stop. During the thunderstorm season each year, lightning can cause the grid voltage to fluctuate drastically, causing the air compressor to stop and the Ningzhi equipment is forced to stop. In the year, there were four failures caused by lightning caused by the grid voltage fluctuations causing the air compressor to stop. Later, the lightning protection net of each system of air separation and bathing was improved. Although the lightning situation in the plant area in 2008 was more serious than that in 2007, only two failures caused by the power grid voltage caused by the power grid caused the air compressor to stop. This shows that the measures to improve the lightning protection network of each system have achieved certain results. 2 In the start of the engine, the centrifugal air compressor in the start of the parking failure occurred in the cause of the gas plant director. There are 5 start-up gearbox oil pressure is too low; (2) due to the internal vibration of the condensing unit inside the centrifugal compressor is too large during the start-up 3 high-voltage fuse fuse damage during the start-up 4 can not be converted to direct start-up protection Relay action. On September 25, 2008, when the 2 heart air compressor was started, the unit automatically stopped when it started. After inspection, it was found that the control system voltage bar flow protection parameter setting was wrong, the current exceeded the protection current when the unit started, and the motor attached to the relay action caused the parking. After resetting the parameters, the unit started normally. Surge surge occurs in the 3 泞 是 is the vibration under abnormal conditions caused by the flow rate of the centrifugal compressor reduced to a certain extent. The cause of surge in the centrifugal air compressor is that the air filter is clogged, the intake air is not smooth; the machining gas volume changes greatly and the check valve fails; (4) the inlet guide vane does not operate normally; the vent valve action + normal; Or the inlet temperature is too high; the signal line is damaged or the contact is good, the low is æ·™æ¿(6)æ¶‘éš¹Ç”é¾ƒç ˜The pressure sensor is faulty. When the centrifugal air compressor surges during operation, it is the compressor outlet pressure. It rises, then drops sharply, and it fluctuates periodically; the flow of the compressor drops sharply and fluctuates greatly. In severe cases, even air intrusion into the suction pipe occurs; the current and power of the compressor drag motor Unstable loyalty of the volatility group produced strong vibrations, and at the same time issued abnormal airflow noise. In October 2008, around 271,309, the operator observed the vibration of the centrifugal air compressor when the equipment was inspected. The inlet temperature of the stage is increased. The unit parameter parking check before and after the failure found that the interstage cooler was severely blocked by algae. Clean the intercooler of the air compressor, hold the cooling water, the total water inlet, set up the table, and move the cleaning water filter to start the operation. The machine test runs well. So far, there has been no empty project caused by the interstage cooler blockage. Interlocking shutdown data Data failure before data failure Data level vibration value Mm level vibration value Mm level vibration value Mm level inlet temperature 1 level inlet temperature t press surge failure. 4 car, the card machine causes the centrifugal air compressor to smash when the card machine is caused by 1 transmission gear damage 2 working impeller damage 3 has a hard object into the worm inside the 1 butterfly rust is also strict. On the 6th of 2008, the machine repair 1 was carried out by a 24 centrifugal air compressor that was suspended for 15 people. The unit was killed and the unit could not be turned and opened to check the gears. It was found that the gears were completely intact and the graded worms were dismantled. It was found that the volute of the grade volute was more serious. Remove the rust on each volute and clean each impeller. The installation was re-arranged and the unit turned normal. After analysis, the reason for the volute rust unit card machine is that the time for emptying the residual gas and condensed water in the unit during the last stop is too short, and the unit has more condensed water after cooling. To make the volute corrosion faster 5 Conclusion In order to avoid the normal production of air separation equipment due to the failure of the air compressor, the safety operation rules should be strictly implemented. Before starting the air compressor, carefully check the parameters of the motor startup cabinet, etc. Normal, the air-cooling water source of the air compressor is located at the normal position of the vacuum degree guide vane and the interlocking automatic vent valve. After starting, check whether there are abnormal noises in all parts of the unit, and whether the vibration values ​​at all levels are normal. After the unit is loaded, check the vibration value of each level. Lubricating oil temperature, cooling water temperature, motor current, etc. are normal. Strengthen the maintenance of the unit. To raise and repair. Thereby reducing the probability of emergency repair of the unit. Strictly implement the all-round all-round equipment inspection system for all employees, and find that the unit has abnormal conditions for immediate maintenance. Flotation Flocculants & Collectors
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