The problem of the simple process of the single-unit system of the air compressor and the improvement of the compressor-level impeller failure were completed at 18:14 on June 15, 2006 under the guidance of the manufacturer's site. The test was started after 48 hours of operation. On the 29th, according to the production needs, the normal downtime was carried out, and the preparation work before the start was started according to the start-up requirement. After the conditions were met, the compressor was started. After the start-up, the vibration level of the unit suddenly rose from 035 mil to 11 mi, and the unit alarmed. Parallel lock is stopped. After the manufacturer arrives at the scene, it is turned on several times in succession. Because the three-level vibration value exceeds the standard, it cannot be started normally. The manufacturer has completed the comprehensive disintegration inspection of the grade cooler, the level plane and the thrust bearing, the grade carbon ring seal and the grade rotor assembly. The impeller is severely deformed by a blade. Later, due to human factors, the impeller was struck by external force, which affected the analysis of its deformation mechanism. The reasons for this cannot be ruled out: (1) the impeller material and the reason for its manufacture. The impeller is a high-efficiency back-bend design. The impeller material is 15-5PH stainless steel. According to the deformation of only one blade, the other blades have no obvious change, so the impeller material and manufacturing reasons cannot be excluded. (2) There are other solid objects in the inspection. The fault impeller is the first stage, which can eliminate the improper dust removal in front of the machine and enter the solid particles to strike the impeller to cause deformation. On June 15th, the inspection and start-up operation are carried out under the guidance of the manufacturer, and the trial operation is normal. After the device, there is a fastener falling off between the rotor assembly and the impeller to cause deformation. However, the speed of the impeller reaches 10000r/min. This high speed should not only deform one blade of the impeller, but also cause damage to all the blades. At the same time, there is no obvious impact of the blade; (3) After the air is compressed, a large amount of water will be deposited, which must be discharged in time, otherwise it will affect the normal operation of the lower impeller. If the air is compressed by the stage, the stage impeller and cooled by the two-stage cooler, the condensate separator and the automatic steam trap can not completely separate and discharge the mechanical water, which will increase the working load of the stage impeller and may cause damage to the impeller. In view of the severe deformation of the impeller of this class, there is no repair condition, the manufacturer provides a new impeller. After passing the dynamic balance test, the installation test machine is normal. The third-stage impeller failure causes the 2 compressor to stop for nearly 3 months, giving production. Great impact. Cooling device inlet and outlet port-shaped pad and guard plate installation diagram Reason analysis: (1) 3 air compressor station system design circulating cooling water system using ion high-pressure electrostatic water processor instead of traditional chemical treatment of circulating water, 3 The centrifugal compressor was put into operation from March 18, 2005 to May 2006, and there was a total of more than one year of cooler fouling. The stand-alone operation time was about 5 months, indicating that the ion high-pressure electrostatic water processor has a certain effect, but it has not been reached. The expected effect, at the same time, can not rule out the possibility of further increasing the fouling rate of the cooler due to the first deviation of the gate rubber seal of the cooler inlet and outlet; (2) February and May 2007, 1 and 3 compressor cooling The scale deposit and the water inlet gate rubber seal of the cooler are offset. When the cleaning unit performs chemical cleaning on the cooler, the selected agent has strong corrosiveness, which has a serious influence on the cooler tube bundle, and can only be immersed for descaling in a short time, and the tube bundle fouling in the middle portion cannot be cleaned, so that the cooler is replaced. The hot area is reduced, and the scale is re-smelted in a short time, forming a vicious circle. At the same time, due to fouling, the pressure difference between the inlet and outlet of the cooler is increased, so that the gate rubber seal of the cooler inlet is washed away and runs. Partially, the structure of the cooler is outside the water pipe, in the gas pipe, the pipe gap is small, the scale is not easy to clean, but it is easy to scale and is blocked by dirt. Solutions and measures: (1) Thorough cleaning of the compressor coolers. When cleaning, the chemical cleaning liquid with less corrosiveness to the copper tube bundle of the cooler is selected, and the chemical cleaning and the water washing are taken over to achieve the purpose of thorough cleaning; (2) the design defect of the gate rubber gasket for the inlet and outlet of the cooler, As shown, the stainless steel guard is added to reduce the possibility of the deviation of the gate rubber seal; (3) to improve the improvement and management of the circulating cooling water system. The ion high-pressure electrostatic water processor of the circulating cooling water system can not completely achieve the functions of scale inhibition and sterilization and algae elimination. The dosing of the water circulation system should be carried out regularly and the water quality test should be carried out. The water system bypass filter and water supply are all Automatic filters should be enhanced for reliable operation. The cooling effect of the cooling tower is extremely critical, especially in the summer, the water supply temperature should not exceed 32. The selection of process shut-off valve improves the two DN400 shut-off valves for single-unit external air supply and the four DN600 process shut-off valves for the station area. The purpose is to ensure single-unit shutdown and maintenance and each machine can be used. Supply air separately to the two main tubes as needed. However, after the production, it was found that the two DN400 metal hard sealing butterfly valves of the single machine and the four DN600 metal hard sealing butterfly valves of the two mother tubes could not reliably cut off the air source, and the air leakage was serious. The stopped compressor could not be arranged for maintenance. Production safety poses a threat. After inspection, it was found that the two DN400 shut-off valves of the single-machine external air supply were installed in the wrong direction. After installation in the adjusted direction, the air leakage still occurred. After that, the six DN400 metal hard-sealed butterfly valves of the three machines were changed from single-sided sealing to double-sided sealing. The effect is still not ideal. It is necessary to add a single gate valve to each of the butterfly valves. However, the four DN600 metal hard sealing butterfly valves in the station area are not replaced and processed. This results in the pipe docking of the 4th machine of the 2nd stage. Great impact. Analyze the reason why the metal hard seal butterfly valve is not tightly closed and leaks. First, the pipeline is not thoroughly cleaned and purged after the construction. The welding slag, rust and other solid particles affect the tight closing of the valve, and the second is the condensed water in the compressed air. Containing corrosive substances, the butterfly valve plate and sealing surface are corroded, which affects its sealing performance. At the same time, because the compressed air is completely oil-free gas, it also affects the sealing performance of the valve. The design of the intake air duct is improved according to the condition that the air intake of the unit is 400Nm3/min. The diameter of the suction air duct is DN1000, the height of the air inlet is 15m, the top is equipped with a rain hat, and the stainless steel screen is placed on the air inlet cover. Prevent animals or other foreign objects from entering the compressor. The grade dust removal is a low pressure jet pulse bag type dust collector with a filtration area of ​​480 m2 and a flow rate of 1 m/min. The filter bag is a needle felt and a film coating. According to the form of the outlet of the low-pressure jet pulse bag type dust collector and the inlet of the second-stage fine dust collector, the connection between the two dust collectors is designed to be a square air duct and a box form. The pipe material after the air intake filter is made of stainless steel. The compressor inlet flange size is DN500, the inlet pipe diameter is DN1000, and a DN1000/DN500 is designed, and a tapered pipe with a length of 1000mm is used as the connection. Use large radius bends to reduce pressure drop and intake air retention. The horizontal extension is mounted with a certain slope to prevent condensation from entering the compressor and a discharge at the low point of the horizontal extension. The compressor intake system is as shown. Compressor Intake System This type of intake duct system has been designed and operated for more than two years. It has been proved that the compressor meets the requirements of intake air quality, but the only shortcoming is the primary dust collector outlet and the secondary fine dust collector. In the design and construction, the inter-square air duct and the box are only subjected to rust removal treatment, and no rust and anti-corrosion treatment is carried out, so that the square air duct and the box body have rust and fall off after long-term operation. The filter capacity of the filter has a great influence. The air duct and the box are derusted and treated during the maintenance of the equipment, which further improves the intake quality. Conclusion The C450MX3 centrifugal air compressor is used as a large power system, lubricating oil system and equipment operation management to provide conditions for the compressor to operate well. Our company has continuously improved the problems in the use of this type of compressor, solved some of the constraints that affect the safe and normal operation of the compressor, and also responded to some problems that still remain unsolved. It is the fourth compressor of the second phase. The design and installation provide a reference.
Molybdenum Wire Cut EDM is fast, effective, and can be used to machining virtually any electrically conductive metal material, including Bronze, Copper, Tungsten, Carbon graphite, Carbon steel, Stainless steel, High alloy steel, Hard alloy, Inconel, Kovar, Titanium and many others. It is widely applicated in metal material processing and mould making industry.
Computer-automated CNC equipment and advanced CAD/CAM programming guarantee our Wire Cut EDM to meet even the tightest tolerances. We have been developed to prove an ideal mix of Speed, Accuracy, Surface Finsh and Low electrode Consumption.
Wire Cut EDM,Wire Cutting EDM,CNC Wire Cut EDM Machine,WEDM machine Jiangsu Sailing Intelligent Equipment Co., Ltd. , https://www.sailingcnc.com