Analysis of the reason of DAIHATSU Brazed Radiator
In the operation of the unit, # 1, # 2, # 5 and # 6 machine has the DAIHATSU Brazed Radiator end cover at the bottom of the fault of leakage or leakage, and especially in the process of the unit startup or shutdown, fault occur more frequently. DAIHATSU Brazed Radiator isolation between oil, water and oil and water leakage of all rely on two type O sealing ring, if two o-rings break or shift, cause gap change, is bound to cause leakage. Because the sealing cover of the o-ring is on the left and right side, instead of the traditional upper and lower sides, as soon as the leakage occurs, the tightening of the flange bolt can not reduce the leakage.
After analysis, the reasons for the variation and breakage of O - type sealing ring are summarized.
1) in the process of starting or stopping of the unit, DAIHATSU Brazed Radiator oil side and water side often have pressure fluctuation, which causes the O ring seal to move, causing it to leak.
2) when the unit is installed, if the DAIHATSU Brazed Radiator has eccentric installation, it will make the clearance of O ring seal abnormal. In operation, if there is a slight pressure (oil side, water side) fluctuation, it will cause leakage.
3) every time in the process of inspection, replacing type O sealing ring, because the bottom end cover is narrow, maintenance, installation inconvenience, tend to appear o-rings are broken copper bed pressure, near the leak. After each overhaul, the probability of leakage on the water side exceeds the oil side, which proves that the current design is not easy to overhaul and ensure the quality of maintenance.
For steam turbine runtime to assure the safety of turbine oil cooling have enough quantity, duplex DAIHATSU Brazed Radiator consists of two same size DAIHATSU Brazed Radiator and the 3-way valve (pos. No., can be a job, a backup. If the cooling effect of the unit oil temperature is high or the water inlet temperature is too high, the cooling effect can be used at the same time. When the DAIHATSU Brazed Radiator is needed to be cleaned in operation, the standby DAIHATSU Brazed Radiator can be turned on, without the need to stop.
Normal operation of the steam turbine generator set, due to the bearing friction consumes part of the work, DAIHATSU Brazed Radiator will be converted to heat the bearing lubricating oil temperature, if the oil temperature is too high bearing could be softening, deformation or damage accident. For the normal operation of bearing, lubricating oil temperature must be kept in a certain range, the general requirements to enter the bearing oil temperature at 35 to 45 ℃, bearing the discharge of oil temperature rise generally is 10 ~ 15 ℃, and the bearing must be discharged after oil cooling can be recycled into the bearing lubrication. DAIHATSU Brazed Radiator is the cooling engine oil. Higher temperature of the lubricating oil and low temperature of cooling water in DAIHATSU Brazed Radiator heat transfer, by adjusting the cooling water flow rate to achieve the purpose of control oil temperature (due to high temperature of the rotor at the same time, especially the high pressure cylinder steam side, DAIHATSU Brazed Radiator journal also heat transfer with the outward, so the lubricating oil also have the function of the cooling journal).
