| Home>Bearing knowledge> The reason for the high temperature of the cryogenic low pressure expansion machine bearing (1) |
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";
The reason why the temperature of the cryogenic low pressure expansion machine is too high (1)
Source: China Bearing Network Time: 2014-02-12
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
The expansion machine selected for the cryogenic equipment is attributed to the speed type turboexpansion machine, which transfers energy according to the change of the speed of natural gas activity. The high-pressure natural gas is close to the isentropic expansion in the expansion machine, and the enthalpy falls. Together, the output Work, energy consumption, increase enthalpy drop, make the natural gas outlet temperature drop, reach the cooling intention. The expansion impeller belongs to the radial axis flow and opposes the radial closed impeller, and the impeller of the coaxial brake centrifugal booster is semi-open; The expansion machine and the supercharger are single machines. The expansion machine is the primary equipment for the refrigeration system of the cryogenic station; it is responsible for the important effect of cooling and reclaiming energy. The flow of the high and low pressure expansion machines is 18623/17388Nm3 respectively. /h, the speed is 39000/47000r/min; the inlet temperature of the high and low pressure expansion machine is -69.15/21.55°C, the outlet temperature is: -105.32/-39.55°C. After analysis, The primary factors affecting the bearing temperature of the expansion machine are smooth oil, water cooler, sealing gas, accessory quality, repair quality, etc.; the oil film thickness of the smooth oil is the primary reason for restricting the bearing temperature; and the bearing temperature is the influence of the expansion captain. The key to a cycle and efficient work.
1 The problem of the expansion unit In May 2005, the expansion unit showed a high bearing temperature and a chain stop phenomenon (see Table 1 for data); the unit was in a lower load working condition; the refrigeration negative temperature was around -50 °C; It is far from depicting the cooling temperature.
2 Inflator bearing smooth mechanism The smoothing and cooling of the shaft and bearing of the expansion machine is mainly based on smooth oil; the primary effect of smooth oil is to supply smooth and cooling effect to the shaft, bearing and seal. The certain thickness between the journal and the bearing is formed. The dynamic pressure oil film; constitutes the oil film touch; the oil film holds the shaft; the bearing and the shaft do not touch the touch; the shaft and the bearing are liquid conflicts; the conflict factor is small. Together; the metal chips and impurities falling between the conflicting pairs are smoothed Take away the oil; reduce the abrasive wear; take away the heat generated by the conflict; avoid the shaft and bearing temperature is too high and burn the tile.
3 The layout of the low-pressure expansion machine and the smooth oil flow The layout of the low-pressure expansion machine is mainly composed of the expansion machine casing, rotor shaft, impeller, bearing, key, back bolt, heat insulation plate, back pressure seal, sealing rubber ring and The temperature probe and the oscillating probe number are composed. The auxiliary system includes a supercharger, a sealing gas system, a cold blowing system, an accumulator, a balancing valve, and the like.
The bearing of the low-pressure expansion machine and the smoothness of the shaft are smoothed with L-TSA68 turbine oil; the viscosity of the smooth oil is 55.08~82.28mm2/s, and the flash point (opening) target is ≥185°C. Smooth oil The process is oil tank - coarse filter - oil pump - smooth oil water cooler - double filter - pipeline valve - pre-machine filter - shaft, bearing and other parts of the expansion machine smooth.
4 Trouble shooting and analysis 4. 1 View the external system to see the low-expansion machine bearing return temperature field data and the main control room computer display bearing temperature data comparison; and with the infrared thermometer to measure data comparison; measured data at all The same is true; the error is about 2 °C, check the condition of the low expansion machine temperature probe device; if the probe device is loose or the probe linearity is not good; it will also affect the data change; the off-site calibration of the temperature of the site; the sensitivity of the external probe is acknowledged from the beginning; After viewing, no abnormalities were found.
Recommend to friends comments close window
| Bearing related knowledge |
SKF bearing on the grease smooth lathe of the bearing in the humid environment. Precautions in the installation and operation. Correct application of the sliding bearing grease. What kind of local rolling bearing support layout is used for the bearing NA4906?
|
This article links to http://
Please indicate the bearing network http://
Previous: SKF joint bearing oscillation skills and temperature conditioning Next: What is the contact angle of the bearing?
Our key products are hexabromocyclododecane using as fire retardant. As the pioneer of the fire retardant of hexabromocyclododecane, our technicians not only own independent intellectual property, we also accumulated years of management , manufacturing and market expansion experience. This product is a white crystalline powder, theory of bromine content is 74.71% , the density of 2.36g / cm3, it has excellent thermal stability, good dispersion. The product is a alicyclic Flame Retardant with high bormine content.The Hexabromocyclododecane(HBCD) is a kind of high bromine content of alicyclic adivitive flame retardant, its characteristics is low dosage, good flame retardant effect, low impact on the physical properties of material and so on. Mainly used for EPS (expandable polystyrene), polypropylene fibers and as flame retardant for styrene resin . It also can be as a flame retardant adivitive of polyethylene, polycarbonate, unsaturated polyester plastics. Also can be do retardant treatment for knitting material, styrene-butadiene rubber, adhesives and coatings, and unsaturated polyester resin. Packed in net weight 25kg kraft paper bags or 1000kg jumbo bag. You also can contact us for other flame retardant such as Melamine Cyanurate MCA, Ammonium polyphosphate APP, zinc phosphate
melamine polyphosphate, magnesium hydroxide, decabromodiphenyl ethane, decabromodiphenyl oxide, melamine phosphate, Flame Retardant Masterbatch, aluminum hydroxide, Melamine and so on.
Flame Retardant
Flame Retardant,Non-Halogen Flame Retardant,Phosphorus Flame Retardant,Bps Flame Retardant,Flame Retardant Masterbatch
Gemhold (SJZ) Trading Co., Ltd. , https://www.gemhold.cn