Suitable temperature for lubricating oil purifier

The working temperature of the lubricating oil purifier needs to be determined comprehensively according to the oil type, water content and treatment process. The following are professional temperature control suggestions:

1. Standard temperature range

| Oil type | Optimal treatment temperature | Allowable range | Danger threshold |

|----------------|--------------|------------|----------|

| Mineral lubricating oil | 60-65℃ | 50-70℃ | ＞75℃ |

| Synthetic lubricating oil | 55-60℃ | 45-65℃ | ＞70℃ |

| Transformer oil | 60-65℃ | 55-70℃ | ＞75℃ |

| Turbine oil | 58-63℃ | 50-68℃ | ＞72℃ |

| High viscosity oil (＞460cSt)| 65-70℃ | 60-75℃ | ＞80℃ |

2. Temperature control points

1. Temperature rise management

- Heating rate should be controlled at ≤5℃/h

- Use segmented heating:

30-45℃ (preheating stage)

45-55℃ (initial stage of water evaporation)

55-65℃ (deep dehydration)

2. Temperature-vacuum synergy

- Vacuum requirements at different temperatures:

| Oil temperature (℃) | Recommended vacuum (kPa) | Water removal rate |

|--------|------------------|------------|

| 50 | -95 | 40-50% |

| 60 | -98 | 70-80% |

| 65 | -99 | 90-95% |

3. Safety protection measures

- Triple temperature protection must be set:

Level 1 alarm: 90% of the upper limit allowed

Level 2 protection: Automatically reduce heating power

Level 3 tripping: Immediately cut off the power supply when over-temperature

III. Special working condition adjustment

1. Water-containing oil treatment

- Initial stage (water content > 500ppm):

Maintain a low temperature operation at 50-55℃

Prevent sudden boiling

- Later fine treatment stage:

Gradually rise to 65℃

2. Additive protection

- Oil products containing additives such as ZDDP:

Maximum not exceeding 62℃

High temperatures will accelerate the decomposition of additives

3. Operation in low-temperature environment

- When the ambient temperature is <10℃:

Preheat to 30℃ before starting treatment

The pipeline needs to be heated and insulated

IV. Temperature monitoring requirements

1. Measurement point layout

- The oil inlet, heating chamber, and oil outlet must be independently measured

- It is recommended to use PT100 platinum resistance (accuracy ±0.5℃)

2. Real-time monitoring

- Temperature fluctuations should be controlled within ±2℃

- Record temperature curve every 15 minutes

V. Relationship between typical faults and temperature

1. Consequences of excessive temperature

- Oil oxidation: The oxidation rate doubles for every 10℃ increase in temperature

- Gum generation: Gum generation increases significantly above 65°C

- Additive failure: Some extreme pressure agents begin to decompose at 70°C

2. Influence of insufficient temperature

- Water removal rate decreases by more than 50%

- Processing time is extended by 2-3 times

- The centrifugal separation effect deteriorates

Operation suggestions:

1. Use the lower limit temperature for new oil processing

2. Use the upper limit temperature for waste oil regeneration

3. Reduce the temperature by 5°C when processing bio-based lubricants

4. Use an infrared spectrometer to monitor oil quality changes in real time

Note: The specific temperature setting should refer to the equipment manufacturer's manual and be adjusted in combination with the oil test report. For ultra-high viscosity oils above ISO VG 680, the temperature can be appropriately increased, but the heating time must be strictly controlled (no more than 4 hours).