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What are the advantages of an oil cooler?
Release date:
26-04-16
To ensure adequate cooling of the turbine oil during operation, the tandem oil cooler consists of two oil coolers of equal surface area and a three-way valve, allowing one unit to operate while the other serves as a standby. When high oil temperature or elevated inlet water temperature results in reduced cooling efficiency, both units may be put into service simultaneously. Alternatively, during routine cleaning or maintenance of the oil cooler, the standby unit can be activated without shutting down the system.
To ensure adequate cooling of the turbine oil during operation, the tandem oil cooler consists of two oil coolers of equal surface area and a three-way valve, allowing one unit to operate while the other serves as a standby. When high oil temperature or elevated inlet water temperature results in poor cooling performance, both units may be put into service simultaneously. Alternatively, during routine cleaning or maintenance of the oil cooler, the standby unit can be activated without shutting down the system.
During normal operation of a steam turbine‑generator set, a portion of the input power is consumed by bearing friction. The oil cooler converts this dissipated heat into an increase in the lubricating oil temperature. If the oil temperature becomes excessively high, the bearings may soften, deform, or suffer burnout. To ensure proper bearing operation, the lubricating oil temperature must be maintained within a specified range; typically, the oil inlet temperature is required to be between 35 and 45°C, with a typical outlet temperature rise of 10–15°C. Consequently, the oil discharged from the bearings must be cooled before it can be recirculated for bearing lubrication. The oil cooler serves precisely this purpose: it cools the main‑unit lubricating oil. In the cooler, the hot lubricating oil exchanges heat with the cooler cooling water, and by adjusting the cooling‑water flow rate, the oil temperature can be regulated. (Additionally, due to the relatively high rotor temperature—especially on the steam‑inlet side of the high‑pressure cylinder—the oil cooler also facilitates heat transfer to the journal bearings, thereby helping to cool the journal as well.)
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