The Reliable Control of Oil Quality in Japanese Turbine Units

Abstract

The reliable operation of Japanese steam, gas, and water power turbines using a newly developed trouble-resistant oil in association with a successful maintenance service system is discussed. A classic steam turbine oil formula containing a phenolic oxidation inhibitor and a succinic acid-type rust inhibitor made from low-aromatic base stock has been used for trouble-free maintenance. In Japan, the oil supplier and the user jointly administer quality control programs for turbine oils. The accumulated data of the oil supplier are utilized for estimating the optimum oil makeup for individual turbines. Since the installation of several computerized systems responsible for maintaining the quality of steam turbine oil in 165 power stations, the remaining life of the oil has been maintained over the warning limit by estimating the optimum oil's makeup. Remote control systems have been employed at many small hydroelectric power plants in Japan to save manpower. Such modernization has brought about an additional lubrication problem—severe valve sticking. More than 100 water turbine generators have suffered from this problem since around 1965. Maintenance-free type oil was required for these units. A new-type turbine oil for which a sludge dispersant is employed has solved this valve-sticking problem. The evaluation method and in-service performance are provided. The largest combined-cycle power station in the world (output 2000 MW) was recently installed at Futsu Power Station of the Tokyo Electric Co. (in 1985). The lubrication of 14 heavy duty gas turbines (GE9001E, 113 MW) is performed by a new high-temperature gas turbine oil. This oil has done well, providing more than 8000 trouble-free hours of lubrication. The oil quality monitor and control systems are discussed.

Characterizing Antioxidant Potential of Alcoholic Extracts of Rice Husk and Saw Dust for Oxidative Stability of Base Lubricating Oil Using Physico-chemical Properties

“…The change is KV viscosity observed is quite pronounced at 200°C compared to 25 and 100°C. This is attributed due to the fact that for further changes in viscosity, secondary reactions to undergo, which requires high temperatures [43]. Furthermore, oxidation of the organic species in mineral oils and lubricants is more pronounced at high temperatures in the presence of air which leads to buildup of insoluble deposits or sludge thus leading to increase in viscosity [44].…”

Evaluation on synergistic antioxidation of molybdenum dialkydithiocarbamate with arylamine antioxidant

“…Organic species in lubricants are subject to deterioration by oxidation, especially at high temperatures and in the presence of air or metal, such deterioration often leads to buildup of insoluble deposits or sludge and viscosity increase during use (Ohgake et al, 1989;Bakunin and Parenago, 1992). In order to avoid the problems, lubricants need to possess superior oxidation stability.…”

Study of antioxidant property of a thiosphorated compound derived from cashew nut shell liquid in hydrogenated naphthenics oils

“…A lubricant consists of base oils and additives, so in the present investigation the authors used three kinds of mineral oils: hydrogenated naphthenic oils NH10, NH20 and NH140 (Technical regulation, ANP Nº 004/99) for evaluation of the antioxidant potential of the compounds synthesized. Studies of thiophosphorated additive performance in lubricating oil show that these products inhibit and intercept the deterioration by oxidation of organic species present in lubricants, especially at high temperatures and in the presence of air or metals (Ohgake, et. al., 1989).…”