Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

0

Share

Download to read offline

Contamination 2015

Download to read offline

Welfare of hydraulic and lubricating systems. Contamination Control

Related Books

Free with a 30 day trial from Scribd

See all

Related Audiobooks

Free with a 30 day trial from Scribd

See all
  • Be the first to like this

Contamination 2015

  1. 1. Electrostatic Cleaning of Hydraulic and Lubricating Systems Mads Grahl-Madsen mads@grahl-madsen.eu www.creative-engineering.eu
  2. 2. Chemical Contamination It will be difficult to write up exact chemical formulas for the potential chemical reactions in hydraulic and lubricating oils. However, we do know something about what is going on. Oxidation is a process where the hydrocarbons are attacked by oxygen and are broken down to different oxygen rich molecules such as hydroperoxide, alcohols and organic acids. This process can be described in a simplified manner as; RH + [HEATH] -> R* + H Where RH represents a hydrocarbon molecule consisting of a reactant (R) and a hydrogen atom (H). If the necessary amount of heath energy is available, will the hydrocarbon molecule be cleaved and a free energy rich radical (R*) and a free hydrogen atom will be created. The energy rich radical (R*) can bond to an oxygen molecule and establish an energy rich peroxide. R* + O2 -> RO2 This peroxide can in turn react with the hydrocarbon and a hydroperoxide and create a new energy rich radical. RO2 -> ROOH + R* The reactions above are by no means exact, but they give us an indication about the reactions that may occur in the fluid. Most importantly, they give the chemical engineer the possibility to take qualitative precautions towards obtaining a system in equilibrium and give the system a long life.
  3. 3. Chemical Contamination •Reduce the amount of reactive material. To initiate the oxidation process, oxygen must be available. Both air and water can supply oxygen, and should be eliminated from the system •Reduce the amount of catalytic material. Catalytic material, in this context will primarily be copper and iron. •The oxidation process is endothermal, i.e. heath is necessary. If the operational process is kept below 65 0C, oxidation will only rarely be a problem in modern oils, which is given oxidation inhibitors. •Add an inhibitor. This is normally done, but it is important not to exceed the recommended temperature if these inhibitors should have the desired effect. It is also important that the oil is free from catalytic material. These inhibitors only slow down the oxidation process, and will eventually not have any effect. During operation A few hours after stop 10-15 hours after stop Temperaturedecrease
  4. 4. Electrostatic Cleaning of Hydraulic and Lubricating Systems •Ionic bonds •Covalent bonds •Polar •Non-polar Water Molecular Bonding
  5. 5. Industrial Electrostatic Cleaner Reduce the amount of reactive material, i.e. water Reduce the amount of chemical compounds that can act as reactive material Reduce the amount of catalytic material, metallic particles.
  6. 6. Forces acting on a particle in an electrostatic cleaner Flow field Contamination Particle Electricfield
  7. 7. Electrostatic Cleaning do the job. Do not remove additives 0 5 10 15 20 Thousands Operating time, hours Numberofparticles 0 2 4 6 8 10 12 14 16 18 5m 10m 15m 20m 25m 0 5 10 15 20 25 30 35 40 O p e ra tin g time , h o u rs ViscositycSt/40C 0 24 73 122 169 217 265 314 361 409 457 505 526 575 0 , 0 2 8 0 , 0 3 0 , 0 3 2 0 , 0 3 4 0 , 0 3 6 0 , 0 3 8 0 , 0 4 0 , 0 4 2 O p e r a tin g tim e , h o u r s [%]contence 0 2 4 7 3 1 2 2 1 6 9 2 1 7 2 6 5 3 1 4 3 6 1 4 0 9 4 5 7 5 0 5 5 2 6 5 7 5 P , [% ] Z n , [% ] AdditivesParticles Viscosity Agglomeration Operated in 600 hours on a Tellus T32 (Shell) UCC

Welfare of hydraulic and lubricating systems. Contamination Control

Views

Total views

369

On Slideshare

0

From embeds

0

Number of embeds

8

Actions

Downloads

2

Shares

0

Comments

0

Likes

0

×