The vibration value is large, and the vibration value is obviously increased when the vehicle is restarted. (1) Analysis of the vibration causes It is found through analysis that the order of the manufacturers is determined by the speed increase machine, and the compressor and the motor are found on both sides. When the compressor is in normal operation, the pipeline is heated and expanded, and the position is shifted, which causes the position of the speed increaser to change. When the machine is stopped, the compressor is returned to the original position by the cold stress of the pipeline. After several times of stopping the compressor, the speed is increased. The positional offset of the machine and the compressor is increased, and the misalignment is intensified. When you are looking for the right again, you will still find the compressor with the speed increaser as the standard. Due to the offset of the position of the speed increaser, the adjustment of the centering of the compressor is increased. Since the compressor is constrained by the pipeline, if the offset is adjusted too much, the pre-stress will be pre-stressed in the cold state. The expansion of the tube further increases the force on the compressor, and when the compressor is started and stopped during operation, the position of the compressor changes, thereby causing an increase in the vibration value. (2) The solution is to take the compressor as the standard, and loosen the compressor anchor bolt each time to make it freely balance in the cold state, then fasten the anchor bolt to fix the compressor, and then find The compressor and motor can avoid the above problems. In addition, in order to eliminate the constraint of the pipeline to the compressor, the vibration problem is solved by adding an expansion joint to the pipeline that affects the third-stage air intake. The performance degradation causes the surge problem. Surge is caused when the intake air flow falls outside the boundary of the design normal working area, the air flow will produce rotational separation in the impeller or diffuser flow path, and in severe cases, the compressor discharge pressure will be low. There are three reasons for the surge caused by the system pressure, which causes the flow to drop. (1) The compressor impeller flow path is uniformly attached with too much dust, which degrades its performance; (2) The compressor inlet is self-cleaning. The air filter element is dirty and the suction is not smooth; (3) The air intercooler and the final cooler air duct fin are partially blocked, so that the air supply is not smooth and the cooling effect is poor. The compressor inlet self-cleaning air filter element is processed and replaced, but the air volume remains unchanged, and the cause is eliminated (2); the compressor casing is opened to inspect the impeller, and the impeller flow path is attached with a large amount of dust and oil scale. The impeller flow path is serious, the second, fourth, and third impeller flow passages are slightly light and accompanied by carbon deposits, and it is found that the inner wall of the primary air inlet duct is stuck with a large amount of lubricating oil, and the air intercooler and the final cooler are opened, which also has a large amount of dust and Oil fouling, it is indeed the surge of the impeller flow path, the air intercooler and the final cooler air duct fins caused by the flow rate drop. Why does the lubricating oil enter the inside of the compressor, and the impeller flow passage sticks to the oil and then sticks to the dust in the air. The layer of ash gradually blocks the impeller flow passage and the cooler duct fins. The oil seal gap of the bearing seat on the inlet side of the air inlet is increased, the lubricating oil leaks along the shaft, and is affected by the negative pressure of the primary air inlet. The lubricating oil enters the first impeller air inlet directly through the first-stage air seal with serious damage. Therefore, the lubricating oil passes through the first and second impellers to the air intercooler and then enters the third and fourth stage impellers and finally passes through the final stage cooler and then enters the pipe network, and then absorbs the dust in the air to degrade the performance of the compressor. Clean the impeller and air cooler dirt, replace the oil seal and the first gas seal. After 3 months of operation, the compressor performance will still drop. Therefore, the oil seal must be modified to completely prevent the oil from leaking. After analyzing the original labyrinth oil seal structure, it is decided to add a gas seal to the oil seal to solve the problem of lubricating oil leakage, such as. At the same time, the impeller flow path and the chemical cleaning air cooler fins and water channels are thoroughly cleaned, and the performance of the equipment is restored. To sum up, the above is to modify the failure of the four-stage turbine compressor. It is applicable to all kinds of multi-stage turbine compressors. It has been successfully used in our factory, and now the compressor has been running for 2 years, except for each year. After half-overhaul, the maintenance is no longer carried out (the original 4 major repairs per year), and good economic and operational benefits have been achieved.
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