The source of the fault was analyzed and the anomalous shaft vibrations that occurred during the operation of the two air compressors over the years were analyzed.

There are two sets of air separation units in a chemical plant, which are respectively model 40001800 type 8吮02080. The raw material air compressors are produced by centrifugation in 2002, and the air separation unit of 6000 air separation unit is 6332 type. It was produced in 2004, two The air compressors are all gear-type structures, the stage compression stage is cooled, and the large gears are driven by the synchronous motor through the gear coupling. The stage impeller is composed on the root gear shaft. The shaft rotor and the stage impeller form a 1-axis rotor on the root gear shaft, respectively meshing with the large gear, and increasing the speed by the large gear. The motor speed is 150, 440 air compressor 1 shaft rotor speed 12387 pool, shaft rotor speed 14769 pool orphan The Ying 3 air compressor rotor is 9512 coffee 470 coffee. There are two radial bearings on each rotor, which are tilting pad bearings, and oil pumping is used to force lubrication.

The tilting pad bearing has 5 tiles, circumferentially uniform, the position of the bushing is concentric with the main journal, the tile is made of steel, the inner hole is cast with babbitt, and the pad is mounted.

The tile installed in the bearing can swing independently of the axis of the main journal about its own axis, and is horizontally restrained by the bolt so that it does not rotate with the journal during operation. Damping is effective, oil is supplied from the outside of the bearing housing, and oil is returned through the bearing clearance. During operation, each block changes its position with the fluid dynamics generated by the rotation of the journal, so that each tile has an optimal oil wedge. Due to the large gap between the tiles, the oil film is discontinuous and rotates with the oil film. The related instability is also difficult to form. Each stage of the impeller shaft is equipped with two vibration measuring points. After the current is connected to the preamplifier, the non-standard voltage signal is output, and then the framed type monitor on the instrument control cabinet processes the output standard analog signal at 05, and participates in the alarm. Interlocking.

Note. Stage impeller; 2.2 person 28 vibration measurement point; 3.4 person 48 vibration measurement point; 4. Stage impeller; 5. Stage impeller; 6.3 person 38 vibration measurement point; 7., 18 vibration measurement point; 8. Stage impeller.

The neutralization method is used to treat acidic wastewater and alkaline wastewater, and can also regulate the chemical precipitation of the treated sewage. Some chemical agents are placed in the sewage to cause direct chemical reactions of the pollutants in the sewage to form precipitates of insoluble solid products, which are then purified by solid-liquid separation. Heavy metal ions in industrial wastewater, such as unexposed lead chromium and copper, can be removed by chemical precipitation to remove redox. A method for converting toxic pollutants in sewage into non-toxic or slightly toxic substances by a redox reaction of pollutants in sewage and sewage is called a chemical conversion method. Commonly used in sewage treatment, the agent is air ozone chlorine Cl2 potassium permanganate KMn01, etc., as a reducing agent is ferrous sulfate sulfite.

electrolysis. The electrolyte solution generates an oxidation reaction and a reduction reaction on the two electrodes under the action of a direct current.

3.2.3 Physical and chemical treatment The sewage treatment technology that uses the combined effects of physics and chemistry to purify the sewage. The treatment technologies belonging to the physicochemical treatment method include coagulation air flotation adsorption ion exchange electrodialysis reverse osmosis ultrafiltration and the like.

4 Conclusion Because China's environmental protection work started late, at the same time, most of the past environmental protection work focused on the establishment of hardware engineering equipment, and less attention to environmental protection technology. However, with the stricter environmental regulations, the future environmental protection standards will be greatly improved. Therefore, only by improving and improving environmental protection technologies can we fundamentally solve the environmental problems we face.

At present, China's environmental biotechnology is in its infancy, and the development of this technology needs to be widely supported by the social peers and competent authorities, vigorously carry out bioengineering technology research and play its role, and promote biotechnology in environmental protection. The serious environmental protection problems facing the present and the future will play a greater role in providing quality environmental protection technologies for the environmental protection market.

l Wu Hao. Wastewater biological treatment technology M. Beijing Chemical Industry Press, 23.

2 Guo Yinsong. Water purification microbiology. Wuhan Wuhan University of Hydraulic and Electric Engineering Publication 1 Failure Analysis Two air compressors have been in operation for many years, and there have been many abnormal shaft vibration phenomena in different situations. Now we analyze and summarize them in order to find a way to overcome the abnormal axis vibration.

1.1 Rotor material occurs twice in the annual test phase. In 2004, after the shaft vibration gradually rises, the sudden over-range 200μm interlocking parking is started. When the inspection is turned on, the impeller cracks or falls off, causing serious damage to the rotor dynamic balance. Rarely occurs in the air separation industry, which is the quality of product manufacturing. At present, the impeller material is made of 302 stainless steel, and no impeller breakage occurs.

1.2 The long-period operation of the impeller on the scale, the cumulative operation of 3.5. Now the stage shaft vibration 1 in the measuring point 338 448 slowly rises, and exceeds the alarm value of 64.75 哗, breaking through to 7,0,8,0 claws, the grade shaft vibration point 1223 did not exceed 25 calls and was basically stable. After the shutdown inspection, the impeller has a lot of ash accumulation, and the condensate drainage of the grade cooler is not smooth, causing scale on the impeller of the stage rear cover plate. The presence of dirt causes the rotor to balance the dynamic balance; The inner wall is seriously corroded, and many rust slags at the bottom are sent to the professional factory for the flow path cleaning flaw detection and dynamic balance check. The shaft vibration is normal after the start, and the inner wall of the cooler is carried out at the same time. Thoroughly remove rust and corrosion, and expand the condensate blowout pipe from DN25 to DN50 to prevent condensate from accumulating at the bottom and being taken away by the airflow to flush the impeller. In 2009, the shaft vibration of DH air compressors rose, and the monthly increase was 20μm, reaching 57μm. The level was not more than 27μm, which was still solved by cleaning the impeller to correct the dynamic balance.

1.3 Watts in the presence of damage 32 air compressor In 2008, after the casing loop of the treatment-grade outlet pipe leaked, the original stable shaft vibration continued to rise after the start-up, and the shaft-shaft vibration ratio rose by 301 to 53 before the maintenance, and the shaft vibration of the shaft rose. 13,1 up to 37,1 can not be alleviated, had to stop the inspection, found that the two-tile damaged block on the top of the grade bearing, its babbitt alloy fell off, after the replacement of the tile treatment, the start-up was stable, the shaft vibration of each stage did not exceed 30 å“—.

1.4 The bearing clearance is too small, the contact surface of the tile is dirty. In recent years, the oil temperature and oil pressure of the H440 air compressor are stable. When no operation is performed on the process, the shaft vibration of the various stages is abnormally fluctuating. Sometimes fluctuating a few micrometers, sometimes a dozen micrometers, sometimes a sudden rise or sudden with a sudden temperature change of 21 or so. Open the bearing inspection, the tile is not damaged, but there is oil accumulation on the tile surface, resulting in a small bearing gap and a small contact surface, but the lubricant is tested and the oil quality is qualified. Sometimes a lot of oil slag can be found on the large gear teeth. Although the lubricating oil test is qualified, the possibility of oil quality change under certain operating conditions is not excluded. The shaft vibration is stable after each cleaning of the tile. After that, the lubricating oil supplied by a former factory was selected from Shell 1st 8 6 46 Turbine Oil, and the original 3,04 type screw oil pump was replaced with a larger current 3-phase 06 type screw oil pump to strengthen the lubrication of the bearing. In the subsequent inspection, there was no carbon deposit on the bearing surface, and the shaft vibration of the machine did not appear abnormal fluctuation of the sinusoidal waveform during the machine operation.

1.5 instrument control point fault air compressor after the completion of the inspection, the two axis vibration measurement points 2838 abnormal measurement point 38 straight rise measurement point 28 fluctuations, had to stop the inspection again, found that the fixed sensor fastening nut loosened off The friction between the sensor tip and the rotor spindle with the shaft affects the measurement. Then, the fixing nut of the fastening sensor is re-examined for each vibration point of the shaft, and the shaft vibration is normal after starting. Sometimes the sensor and the extension cable connector have oil and may be measured incorrectly. The preamplifier has a long operating time and a linearity difference, which also causes the shaft vibration to fluctuate.

1.6 The alignment of the motor and compressor should be in accordance with the requirements of the specification, and the coaxiality should be qualified. In 2005, the DH63 air compressor was found to be unqualified due to the shaft vibration rise inspection. When the motor was adjusted, it was found that the underside of the motor was not standardized. Instead of using the channel steel, some of the horns were deformed. The grouting layer is also inconsistent with the specification, and the horn is higher than the grouting layer, and some of the horn and the motor base are not tightly combined. The above causes a change in the alignment during operation, and the shaft vibration fluctuates.

2 Solution 1 Equipment manufacturers must guarantee product quality. These core components of the rotor bull gear must ensure reliable material. For example, the impeller material LV302B high-strength stainless steel selected by the Drum Air Compressor has not been subjected to impeller cracking for many years.

2 Unit installation must ensure the construction quality in strict accordance with the requirements. Coupling alignment, bearing clearance of the bushings, tightening of the interference between the bearing cap and the bearing clearance, the gap between the rotor and the seal, and the motor foundation must comply with the relevant technical requirements.

Lubricating oil is periodically tested and replaced. Every time you change the oil, put the residual oil to clean the filter tank and cooler. The oil products are supplied by regular manufacturers.

Careful operation to avoid damage caused by the compressor operating point entering the surge zone.

Before each start-up, it is necessary to test the interlocking stop oil pump interlock start and stop and the anti-surge valve action condensate discharge. The self-cleaning filter should be replaced in a timely manner if the filter resistance is too large or there is a flat crack.

Strictly follow the equipment operating procedures to control various parameters to avoid excessively high oil temperature and high fluctuations. The oil pressure meets the requirements, and the operation should be smooth and slow, so as to prevent large fluctuations.

Reduce the number of starts and stops. Every time a large unit starts, a large vibration will occur, which will damage the bearing bush. Therefore, the number of stops will be reduced, the sudden stop of the load will be avoided, and the inspection and maintenance of the electric line will be strengthened.

Plan to overhaul the unit every year. According to the instructions, the lubrication system of the interstage cooler compressor unit is thoroughly maintained. The rotor is cleaned by the flow path, and the dynamic balance test of the flaw detection is performed. The core of the cooler is cleaned to clean the inner wall and prevent corrosion.

Every time the inspection is completed, the instrument personnel must adjust and fasten the sensor nut to ensure that the gap voltage meets the technical requirements, and the connection points are firm and reliable, so as to prevent the measurement from being wrong.

Improve the air quality of the suction port of the air compressor, avoid the location of the filter in the place where the wind direction and dust are too much, do the greening and dustproof around the inlet filter of the air compressor, and pay attention to the sealing ring when replacing the self-cleaning filter cartridge. Installed in place to prevent air shorts from entering the unit without being filtered.

Bow-in-line installation of air compressor online monitoring and fault diagnosis system, the introduction of new early processing, also improved the modern level of equipment management. 3 Conclusion In summary, through the KDONAr400018000 type KDONAr60002000180, air compressor vibration causes analysis, adopted The above-mentioned effective line of 8000 or above does not stop, and the transformation effect is good, which improves the economic benefits of the enterprise.

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