Small power plant steam turbine bearing lubricating oil temperature on the high side

Small power plant steam turbine bearing lubricating oil temperature on the high side - 2018 10 - 27 units for nanjing turbine co. , LTD. , production C330 / N350 - 17. 75/0. 981/540/540 type steam turbine, the use of Shanghai electric power in the work of factory for making 2 * 50% type: FK6F32M steam feed water pump configuration, use the model for G4. 2 - 0. 9/350 - Type 4 330 mw50 % BFPT turbine drive, feed water pump lube oil system of small steam turbine oil supply device centralized oil supply, now since commissioning operation of the unit, steam pump bearing lubricating oil temperature is high, up to 51 ℃, check steam pump manufacturer's specifications in 43 - bearing lubricating oil temperature 48 ℃ between accident situation for 43 - lubricating oil temperature 60 ℃, in view of the anomaly parameters, analyze and find the reason. Steam pump bearing lubricating oil temperature on the high side: the control unit in the steam pump bearing lubricating oil thermometer with microcomputer, using infrared thermometer for in situ the steam temperature found that the oil inlet pipe of pump bearing, and microcomputer steam pump bearing lubricating oil inlet temperature are basically identical, but ruled out due to thermal meter instructions in temperature on the high side. Unit of each steam pump oil cooled oil is the oil temperature regulator on screen, now the unit steam pump bearing lubricating oil cooled oil is the oil temperature regulating valve in full open position, open the small machine cold oil dampers bypass, steam pump lube oil temperature has no obvious change, through the inspection on # 2 machine shut down after the regulator problem, there is no jamming reason out of cooling water shortage caused by the situation of the lubricating oil temperature on the high side. Through the # 2 machine for 2 - after shutdown 2 small machine lubrication and switch to the cold standby operation, the operation of cold oil machine to clean, the plate heat exchanger heat transfer inspection found no obvious congestion, ruled out because of the cold in the operation of the oiler smudgy blockage caused by cold oil, oil temperature rise high. Inspection on small machine fuel tank system, found that small machine lubricating oil cooled oil is exported after oil filter into the fuel tank, and then from the export of mother tube to 12. 6 meters steam pump bearing, therefore does not exclude the lubricating oil into the tank after cooling lubrication and cooling temperature after heating oil, need to use shut down the opportunity to observe the effect. For small machine cold oil lubrication and cooling conditions for inspection and control on the small machine cold oil import and export of oil temperature meter are almost consistent with microcomputer, so eliminate the situation of surface gauge indicating no inspection on in situ small machine cooling system, small machine lubricating oil export all the way into the cold after the main oil pump oil, the other all the way through the temperature control valve is directly connected with cold oil exports after entering the oil filter, if the temperature control valve regulating insensitive will cause short-circuit, cold oil machine now with # 2-2 machine 2 small machine cold oil machine as an example, the cold on the small machine lubrication and cooling condition of illness. 2 - 2 small machine cold oil inlet temperature 54. 7 ℃, cold oil export pipeline to 40. 5 ℃, but oil filter inlet piping to 49. 9℃（ See the appended drawings) , judgment for lubrication and cooling effect is not cold, cold most lubricating oil from the oil outlet temperature control valve short circuit, only a small fraction of these into the cold oil machine, so the judge small machine lubricating oil cooling oil temperature control valve adjustment not sensitive problems lead to lubricating oil temperature rise high. Check manual temperature control valve, temperature control valve installed in the cold after the oiler export oil pipeline, in order to maintain the stability of the outlet temperature of the lubricating oil, keep around 43 ℃, temperature control valve control temperature range for 43 & plusmn; 2 ℃, the temperature control valve regulating insensitive makes most directly by the lubricating oil temperature control valve into the oil filter is the direct cause of steam pump lube oil temperature on the high side. To take advantage of railway inspection on temperature control valve, ensure the steam pump lube oil temperature in the normal range. The appended drawings: Source: the eagle eye research)