Šiluminė energetika

Šiluminių jėgainių turbinų alyva

Garo generatorių tepalai`

Agregatų montavimo sriegių pasta

Lubricants for thermal power plants

FRF oil for turbine control system

Fire Resistant Fluids (FRF) oil recommended for BHEL make steam turbine control system in 500 MW .

According to ISO 6743/4, FRF is a fluid based on triarylphosphate ester marked ISO-L-HFDR.

1. Lubricants for Thermal Power Plants

2. Introduction 1. The proper selection and use of lubricants, as well as the care and operation of lubricating systems, is an essential part of any maintenance program. 2. To choose an appropriate lubricant for a particular application and to maintain the lubricant’s effectiveness, a basic understanding of lubrication theory and the characteristics of lubricants can be very beneficial.

3. Fundamentals of lubrication

The basic purpose of a lubricant is to reduce friction and wear between two surfaces moving relative to one another.

In most cases, a lubricant also dissipates heat, prevents rust or corrosion, acts as a seal to outside contaminants, and flushes contaminants away from bearing surfaces.

4. Oil and Grease Requirement

5. Lubricant oil 1. A lubricating oil is composed of a base stock blended with various additives to enhance performance and maintain quality. 2. The base stock may be

a petroleum oil,

a synthetic oil,

or in rare specialized instances, vegetable oil.

6. Lubricant oil characteristics Viscosity

Viscosity index

Pour point

Flash point

Fire point

Neutralization number

7. Additive in lubricant

1. Additives present in a lubricant improve and strengthen the performance characteristics.

2. Chemically active additives are able to interact with metals and form a protective film with the metallic components present in the machinery.

8. Lubricant additives

Surface Protective additives

Performance Enhancing additive

Lubricant protective additives

Oxidation inhibitors

Foam inhibitors

Viscosity index improver

Pour point depressant demulsifier emulsifier

Lubricity additives Antiwear additives

Extreme pressure additive

Tackness additives

Corrosion & rust Inhibitor additives

Detergents additives

9. Common elements found in lube oil additives

10. Common additives in lubricants

11. Grease

1. Lubricating grease is a mixture of a lubricating fluid, a thickening agent, and additives.

2. Petroleum oils mixed with a soap thickening agent make up most of the grease in use today. 3. The soaps are formed by the reaction of animal or vegetable fats or fatty acids with strong alkalies such as calcium or sodium. 4. Non-soap thickening agents, such as modified clays and poly ureas, are also used in some instances.

12. Characteristic of a steam turbine oil

 Seven essential characteristics of a turbine oil enable it to perform its critical functions so that a turbine generator unit will operate reliably for long periods.

 (1) Maintain viscosity.

 (2) Minimize friction and protect against wear .

 (3) Transfer heat from the journals, bearing,

 (4) Resist oxidation and degradation due to exposure to air (oxygen), water, and hydrogen,

 (5) Resist foaming and air entrainment

 (6) Protect other components from corrosion

 (7) Separate rapidly from water

13. Additive in Steam turbine oil

 Present-day turbine oils are formulated with a highly refined mineral oil base and a varying number of additives which enhance or impart a specific oil property.

 As a minimum, steam turbine oils contain an antioxidant to retard oxidative attack and a rust inhibitor to protect iron-base metals. In addition, an antifoam agent and a metal deactivator may be present.

 Depending on the properties of the mineral oil base, other functional additives may be used to achieve the required performance characteristics.

14. Oil Specification- KWU –BHEL Turbine 500 MW

 Oil of viscosity class ISO VG 46 shall be used.

 The oil shall be a petroleum product with or without additives to meet the requirement of this standard.