Application of Reolube fire-resistant oil in steam and gas turbines
Traditionally, mineral oil is used as a hydraulic working medium and lubricant in both steam and gas turbines. But in order to pursue higher operating efficiency, the steam temperature and hydraulic oil temperature continue to increase, and the use of mineral oil also leads to an increase in fires. In addition, the trend of increasing the number of units has led to an increase in mineral oil usage, and power plants require extremely high safety, which requires strong emphasis on fire prevention and control in power plants.
In modern turbines of all power levels, the steam temperature may be very high (500-600 ℃), which has far exceeded the Autoignition temperature of mineral oil (about 350 ℃). In the mid-1950s, after a series of fires caused by hydraulic oil pipe ruptures and mineral oil spraying onto hot surfaces, triaryl phosphate fire-resistant oil began to be used in steam turbine speed control systems, and now they have been used in large steam turbine units. Due to the fact that using mineral oil as a lubricant can still cause fires, it was also investigated whether phosphate ester fire-resistant oil can be used as a lubricant in steam and gas turbines. We have accumulated nearly thirty years of experience in various gas turbines from many manufacturers, and have also conducted several tests in steam turbines. In both applications, fire-resistant fuel performs well. It can be expected that their application as fire-resistant lubricants will increase. However, like turbine fluids based on mineral oil, the maintenance and use of fire-resistant fuels must also be carried out with caution to ensure the service life of fire-resistant fuels and the normal operation of equipment. To this end, this instruction is prepared to assist users who use this fire-resistant fuel, especially when the equipment factory has not provided any s estions.
Applicable scope
This instruction provides users with the necessary information and recommendations for maintenance and use of Reolube grade phosphate ester fire-resistant fuel. It is mainly applicable to the use of fire-resistant oil as a hydraulic medium for steam turbine governors and boiler control systems, but many recommendations also apply to the use of it as a lubricant for steam and gas turbines. The use of this instruction manual cannot take precedence over the instructions issued by the turbine manufacturer, but rather supplements their requirements. If there are doubts about the applicability or performance limits of the recommendations in this instruction, the equipment manufacturer or fire-resistant fuel supplier should be contacted to obtain further information.
Although many information in this instruction is also applicable to the application of mineral oil Hydraulic fluid and lubricants in turbines, it is recommended that users refer to the turbine manufacturer's instructions and the corresponding countries or * * * for these products.
Design instructions for Reolube fire-resistant oil
To meet the strict operational requirements of a large range of turbine manufacturers and users, Reolube fire-resistant fuel is made from specially purified triaryl phosphate ester as a matrix, containing additives that improve stability and foaming characteristics.
Factors affecting service life
The service life of all fire-resistant fuels is controlled by the following factors:
--Types and design of systems
--System status
--Initial state of fire-resistant oil
--Operating temperature of the system
--Pollution and purification of fire-resistant oil
--Refueling rate of fire-resistant oil
Types and design of systems
There are some systems in the turbine and auxiliary equipment, and their design will affect the service life of fire-resistant fuel. These systems include steam flow control, lubrication of bearings and gearbox (if used), and hydrogen sealing of the generator. Especially important are hydraulic control systems that operate under high pressure (such as over 60bar) and use small tolerance servo valves.
When designing and using fire-resistant fuel systems, manufacturers must consider the differences in physical and chemical properties between this liquid and mineral oil. For example, if the density of fire-resistant fuel is high, a pump with higher power must be used. Seals, gaskets, and additional filtering equipment may also be required for * * *. When the system needs to be converted from mineral oil to fire-resistant oil, it is necessary to consult the equipment manufacturer before making modifications.
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