Henan Yuguang Gold-Lead Co., Ltd. Oxygen Plant The following is referred to as Yuguang Gold-lead Oxygen Plant, which was put into operation in February 2005. The 60002000 180-type application is set up, and the low-calorie single-temperature molecular sieve adsorption purification turbocharged expander is used. Refrigeration full rectification, sputum and oxygen-nitrogen external compression flow, supporting the 136132 centrifugal air compressor produced by the Drum Group, the air compressor adopts single-intake double-shaft gear assembly type 4 equal-flow compression to be constructed including belt Gear, speed device, compressor body interstage cooler and lubrication system 3 parts.

The compressor body is composed of a box volute large gear and two driven pinions with an impeller, and four impellers are respectively installed in the low flow passage. The compressor is connected to the motor via a geared coupling on the large gear end. In order to cool the gas after the final grade jade. There are three interstage coolers in the lower part of the wooden body, which are connected to the volutes on the body through the circular pipes. The sliding bearing and gear of the air compressor are forcedly supplied with oil.

1 Operation of the air compressor before the overhaul The 6000 air separation equipment has been in operation for more than 3 years since it was put into operation in May and February. Due to the follow-up system production, the Zhufu paying press is required for the fire. 1 In the summer of 2008, the air compressor When the exhaust gas volume reduction resistance increases and the shaft vibration value is high, the exhaust gas volume is reduced by 34. Under the same conditions, that is, the guide vane opening degree is the same as the atmospheric temperature and humidity.

The level of intercooler resistance is too large, and the resistance of the intercooler exceeding 4013 is 5131.

The vibration value of the stage axis is obviously increased, respectively, exceeding the received date of 2000 each 02 7oμm and 8oμm, wherein the interlocking parking value of the vibration value of the air shaft of the shaft shaft is up to 82μm and the interlocking parking value is 64.75; As the temperature rises, the axis vibration is still rising. In order to ensure the normal operation of the air separation unit, the air compressor shaft vibration position interlock is in the resected state.

2 Analysis of the abnormal operation of the air compressor After comprehensive analysis, it is believed that there are two reasons for the abnormal operation of the 632 air compressor.

At first, it was suspected that the interstage cooler cascade caused the air compressor to reduce the exhaust volume and increase the cooler resistance. However, the pH and hardness of the cooling water discharged from the interstage cooler are analyzed. The water interstage cooler discharged from the interstage cooler is basically free of water pH and hardness values, but the soft water pH used in the Yuguang Gold and Lead Oxygen Plant. There is a difference in hardness values, especially the difference in hardness values, so the possibility of cross-stage cooler leakage is excluded.

The final analysis believes that entering, filial piety, with high temperature, increased air humidity, resulting in more condensed water in the interstage cooler, not easy to completely exhaust, which is the main reason for the excessive resistance of the interstage cooler to reduce the exhaust volume; Excessive water content in the interstage cooler causes rust in the inner body and steel support. The rust is detached and blocked, and the air passage is the main reason for the excessive displacement of the interstage cooler.

Ninglang machine self-cleaning filter filter small blood, filtering effect Ling, it sucks 1 position like the light gold lead test factory dust more position, air compressor transport more than 3 而 and overhaul, so that the impeller gradually Dust and rust; and because the cooler is not well drained. The reason why water is carried into the lower volute and the scale is precipitated on the impeller or reduced by high-speed rotation is based on the analysis of 1 and if the air compressor is not overhauled. Turning, the balance will be more and more severely damaged, it will damage the bearing seal impeller of the air compressor, and even the impeller will fly out of the volute, so it is decided to overhaul the air compressor immediately.

3 Air compressor overhaul process On July 9, 2008, the organization staff dismantled the air compressor. After dismantling, it was found that the impeller had a lot of ash, the impeller was clean, the impeller inlet and the runner had scale, and the impeller blade The thickest part of the joint with the lower end cover has a thicker scale and water immersion marks on the first-stage impeller cover and the volute. It’s hard to save;

There are carbon deposits on the bearing pads at all levels.

The interstage cooler is cored, the first stage is relatively clean, the bottom of the inner cooler of the stage intermediate cooler has more rust and sediment, the core 1 is attached with scale, and more than half of the heat exchange channels are blocked.

According to the requirements of the air compressor overhaul on the air compressor product manual and the actual situation, the air compressor system is adopted, and the following maintenance measures are taken. The two sets of rotors are pulled to Kaifeng Air Separation Group Co., Ltd. for flow channel cleaning and flaw detection. Test. Di over the test to know. The balance weight of the shaft at 60,1 is the mass of the left 6.7213.24 axis at 80,1. The balance speed of the balance speed is 1. The weight is known as 12. The right is 2.478. The rotor is unbalanced in the product specification. For Ui0.403g, the lU.25gdDkHfT.m axis is left. 08, 0.0 know; 1 axis left 0.02, right clean the scale rust and dust in the volute partitions of each level.

Except for the inner cylinder of the interstage cooler, and brushing the high temperature paint, the compressed gas was injected into the intercooler core to check the leak point. Remove the rust that blocks the heat exchange passage and descale the core with steam.

Replace the shaft seal of the original shaft seal with a slight leak, and replace the shaft with 6 blocks. In order to facilitate the adjustment of the bearing bush gap, there are 4 top tiles that have not been changed.

Increase the diameter of the interstage cooler drain pipe from the original DN25mnjDN50mm, so that the condensate in the interstage cooler can be completely drained in summer; and the hydrophobic bypass valve should be slightly opened during the future operation, so that the discharged water is fogged. Shape to ensure that the condensate drain inside the interstage cooler is discharged, and + is carried into the lower volute.

After overhaul, the vibration values ​​of the shafts of the air compressors are significantly reduced, and the machining gas volume reaches the original design value.

4 After the overhaul, the stage volute joint is sealed. The rubber ring is overhauled. The seal ring is leaked. After opening, the rubber ring has been cracked from the hoop interface. There is a circular hole with a diameter of 5. The reason should be long, ask to use aging like glue. The strength is lowered and the rubber seal ring is deformed when it is removed after the overhaul and is torn by the air flow.

After the overhaul, the air compressor was operated until August 12, and the air compressor shaft vibration oscillated with large sine waves. There is an upward trend. On August 15th, at 1215, the temperature of the shaft shaft slowly rises and the amplitude of the vibration value is up to 161. The air compressor is immediately stopped. After opening, the upper shaft of the gear is far away from the gear. Fall off. This block is a pressure block for the compressor to operate. Remove the tile and find a foreign object on top of one of the top wires. According to the experience of dealing with empty machine faults, it is believed that the cause of the sine wave vibration of the air compressor shaft is that the bearing bush gap is too small, which affects the formation of the tile by the oil film and cleans the debris present in the oil passage.

On August 16th, 0017, the air compressor was started again. When the exhaust pressure increased to 0.353, the vibration value of the shaft axis showed a large sinusoidal fluctuation, and the amplitude reached 181. After the compressed gas was vented, the shaft vibration value gradually became stable, but the row was smooth. After the gas pressure rises, it starts to fluctuate again. The analysis is called, and the maintenance personnel will tighten the air compressor-stage bearing bushing compression screw in the maintenance process. Therefore, it is considered that the gap between the shaft bush and the shaft is too small, causing the vibration value of the shaft to fluctuate. The machine 1 is found to have found that the bearing of the first-stage bearing bush has been rubbed. Replace the tile and amplify the radial clearance of the bearing bush. The vibration value of the starting shaft is loose.

The air compressor was started on August 18, and it was found that the vibration value of the air compressor stage shaft and the vibration value of the direction axis fluctuated greatly. After inspection, it was found that the rubber pad between the volute and the body plate was misaligned. The rubber pad was broken by the impeller and the high-temperature gas, and the debris was stuck on the impeller or scattered on the edge of the volute.

5Experience summary 1 Centrifugal air compressor overhaul is a more professional work, must be disassembled and installed by professionals. For a hard machine like an air compressor. If the parameters change during normal operation. And to determine the existence of a fault, it must stop in time. Overhaul to avoid a major accident.

Regular maintenance and repair should be carried out in strict accordance with the product specifications and the time specified by the manufacturer to reduce the chance of disease in the equipment, ensure regular maintenance of the equipment, and clean the impeller and runners to check the balance. If the dust is not cleaned or balanced in time. Verification, long-term operation will cause the dynamic balance to be destroyed, the bearing bush seal and the rotor damage; the lubricant should be replaced regularly according to the requirements in the product manual. Guarantee the quality of the cockroach. Such as + and, replacement, lubricant deterioration, oil film formation +15. Damage the shaft 1; replace the self-cleaning filter cartridge to reduce the air intake resistance or the large filter surface to ensure the intake air quality. It is recommended to use the pre-cooler for anti-corrosion treatment or stainless steel lining to prevent cooling. The rust will fall off and block the heat exchanger to meet the road, or the impeller will enter the air compressor impeller to cause damage to the impeller.

Strengthen inspection and monitoring of mobile equipment.

The fluctuation of the shaft vibration value is related to factors such as the rotor dynamic balance bearing bush clearance and the smoothness of the bearing. If the vibration value of the shaft fluctuates greatly and is irregular, but the shaft temperature does not change, the rotor dynamic balance should be considered or the gap between the blocks should be too unstable to form an unstable position. If the shaft vibration value fluctuates greatly and the shaft temperature rises It is possible that the bearing bush can be solved by asking the radial clearance of the shaft 1. The liquid air group acquired the Saudi Arabian Gas Company's 75 shares. According to the China Chemical Industry News report on July 17, 2009, the Air Liquide Group recently acquired the Saudi Arabian 1 ft 1 side industrial gas company 75 shares of the Saudi Arabian illusionary industry public foot The private gas companies operating in Riyadh and Dammam have sales of more than $20 million and employ about 100 people for 8 years. Its main business includes the production of bulk air and bagged gases such as oxygen, nitrogen, argon and acetylene. Promoted by the development of petrochemical industry and the construction of infrastructure projects, Saudi Arabia

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