Industrial technology DH63-12 turbo air compressor secondary bearing over-temperature treatment cover Yunhe (Heilongjiang Beidahuang Agricultural Co., Ltd. Haolianghe Chemical Fertilizer Branch Heilongjiang Yichun Grand Section flow plug aperture, regulation oil temperature and other means to solve the bearing super Temperature phenomenon.
Foreword: DH63-12 turbo air compressor is the sound set made by Shengu Group, which is an important setting for the production of 3 air separation units in our factory. The accidental parking of the turbine air compressor will cause the production system to run at a reduced load, affecting the output and bring economic losses to the enterprise. At the beginning of July 2009, the air compressor was over-temperature jumped due to the secondary bearing, and the production system was in a semi-load production state. As the production consumption increased and the cost of the product increased, our factory decided to enter the large-scale overhaul period in advance, and the system was comprehensive. Discontinued production, disrupted the production operation plan arranged by our factory.
1DH63-12 turbo air compressor structure and technical parameters 11 turbo air compressor structure air compressor is single air intake, double shaft, gear type, four-stage isothermal compressor, that is, gas cooler between each stage The compressor is compressed as close as possible to the compressor of the isothermal process. The turbo air compressor is composed of a speed increaser driven by a motor through a gear coupling, a large gear and two driven pinions arranged in parallel on both sides, and an impeller is arranged at both ends of the shaft. The four impellers are independent of each other and consist of separate volutes mounted on the sides of the gearbox. The bearings of the turbine air compressor are horizontally split, the bearing body is 25 low carbon steel, and the babbitt is cast inside.
12 Turbine air compressor technical parameters (such as Table 1 2 accident through the 12-type turbine air compressor temperature gradually increased, the operator will open the oil cooler, return valve, it is difficult to control the temperature, secondary bearing temperature It rises in stages. At 10:00 am on July 5, the temperature of the secondary bearing rises to 80 °C. The air compressor chain jumps. After the maintenance, the secondary bearing babbitt sintering is treated, and the oil cooler is cleaned. The press was put into production and running, but after two days, because the secondary bearing was overheated, the air compressor jumped again, and the 3 air separation was unable to operate normally and was forced to stop.
3 After the secondary bearing over-temperature analysis, the secondary bearing was found to have carbon deposit, melting and shelling on the surface of the bearing babbitt. This is because the carbon deposit on the surface of the secondary bearing increases with the oil temperature. More and more carbon reduces the radial clearance of the bearing, resulting in too high bearing temperature. The set interlocking stop value is close to the melting point of the bearing alloy, which is easy to cause the alloy on the bearing bush to melt and deform.
4 Turbine air compressor secondary bearing over-temperature treatment measures 41 treatment of water quality problems When we clean two oil coolers used in parallel, there are a lot of impurities such as filter materials brought in by the circulating water on the water seal head side. Seriously affect the heat exchange capacity of the cooler, so that the oil temperature is increased. In order to solve the water quality problem, the main and auxiliary pipelines are prepared on the water side of the oil cooler to add two sets of filters.
42 oil cooler heat exchange area is small, the original two in-line tubular oil coolers are removed, and two plate heat exchangers are replaced to increase the heat exchange area to reduce the oil temperature. The following aspects should be paid attention to when installing the plate heat exchanger.
4.2.1 The plate heat exchanger shall be subjected to hydrostatic test on the water system side before use to ensure no leakage.
4.2.2 Plate heat exchangers require strict flow media for the exchange channels. The water system requires that the media particles must be less than 1 mm in diameter. Therefore, the water system must be filtered to filter impurities, so as not to block the channels and affect the heat exchange area.
Before the oil system pipeline is prepared, the pipeline should be pickled and passivated. The purpose is to remove oxides and impurities from the pipeline and avoid bringing it into the plate heat exchanger. After the pipe is pickled and passivated, it is blown off with dry air, and sealed at both ends for use.
24 welding with argon welding to ensure that no impurities enter the oil system.
After the plate heat exchanger oil circuit system pipeline is completed, oil flushing is required. Before the oil is flushed, the main oil pipeline should be put into the front flange of the turbine air compressor, the flange of the oil inlet pipe of each level of the bearing box, and the inlet flange of the oil passage of the plate heat exchanger should be added with 120 stainless steel filter screen to prevent the impurities from entering the oil system. . When the oil is flushed, do not use the heater in the fuel tank to heat the oil to 70-90C, and start the oil pump for oil flushing for 24 hours. After the oil rinse is completed, check the filter net for impurities, such as the filter is clean and the oil rinse is over.
4.3 Treatment of secondary bearings 4.3.1 Replacement of secondary bearings, new replacement bearing measurements: bearing radial clearance is 0.21mm (standard value is 0.188*0.253mm), bearing axial clearance is 0.23mm (standard value is 0.20*) 0.25mm), the back interference of the tile is 0.02mm (standard value is 0.01*0.04mm). 4.3.2 The throttle plug hole diameter of the bearing oil hole is increased from the original 6mm hole to 8mm to increase the oil filling amount. Take some of the heat generated inside the bearing.
4.3.3 The air compressor should control the oil temperature during operation, and should be controlled between 40*50C. For example, the oil temperature deviation f increases the water volume adjustment of the plate heat exchanger.
4.3.4 Add Bailey anti-wear agent to the lubricating oil to increase the wear resistance of the bearing to reduce the heat generated by the bearing body.
5 The effect of secondary bearing treatment After the secondary bearing of the turbine air compressor is processed, the air load test is carried out for 4 hours, the load test is carried out for 8 hours, and the secondary bearing temperature is between 56 * 65C. The unit runs smoothly and is put into production system. The secondary bearing temperature is always within the specifications.
Conclusion The solution to the temperature problem of the secondary bearing of the turbo air compressor reduces the economic loss caused by the air compressor parking to ensure the continuity of the chemical production, so that the sound is in good condition. Turbine air compressor bearing burning accident will bring great hidden danger to the sound setting. The damage of the bearing can cause the compressor vibration to increase. In severe cases, the compressor shaft breakage phenomenon (such as) may occur.
Table 1 Name Unit Parameter Name Unit Parameter Flow Motor Power Exhaust Pressure Exhaust Temperature Speed ​​(Low Speed ​​Side) Bearing Temperature Speed ​​(Idle Side) Bearing Temperature Alarm Value Motor Speed ​​Bearing Temperature Jump Value
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