The core process of electric heating thermal oil furnace oil boiling (dehydration and degassing) involves initial cold circulation, followed by stepwise temperature rise, segmented constant temperature, and slow gas venting. Rapid temperature increase is strictly prohibited to prevent gas blockage, boiling over, and equipment damage.
I. Preparation Before Cooking Oil
1. System Check
Check that the pipelines, valves, flanges, expansion tanks, and oil storage tanks are free of leaks, and that the instruments, safety valves, and vent valves are in good condition.
Confirm the correct rotation direction of the circulating pump, lubricate the pump body with oil; test the heating tube insulation ≥2MΩ.
The expansion tank is installed at the highest point of the system, elevated 1.5–2 meters above the highest point of the heat-using equipment.
2. Oil Injection and Cold Circulation
Slowly inject qualified heat transfer oil from the expansion tank. After the system is filled, maintain the liquid level in the expansion tank at 1/3 to 1/2.
Start the circulation pump, run the cold cycle for ≥30 minutes to purge air, and ensure stable pressure, flow, and no abnormal noise.
II. Staged Heating and Oil Boiling (Core Process)
1. Low-temperature dehydration section (ambient temperature → 100°C)
• Heat up to 50°C at a rate of ≤10°C/h, then maintain the temperature for 2 hours.
• Then heat up to 80°C at a rate of ≤15°C/h and maintain the temperature for 3 hours.
• Then, heat at a rate of ≤10℃/h to 100℃, maintain the temperature for 8–12 hours, with a focus on dehydration.
• Observation: Continuous steam discharge from the expansion tank vent. Pause heating and maintain stable pressure when pressure fluctuations are significant.
2. Medium-temperature degassing stage (100°C → 150°C)
• Slowly increase to 120–130°C at ≤2°C/h, maintain constant temperature until exhaust significantly decreases and pressure stabilizes.
• Then, heat up at a rate of ≤5°C/h to 150°C, maintain the temperature for 6–10 hours, and remove light components and residual gases.
• Key: During this phase, the exhaust volume is high. Rapid temperature increases exceeding 130°C are strictly prohibited to prevent sudden boiling.
3. High-temperature stability segment (150°C → operating temperature)
• Heat to the working temperature (≤ the maximum allowable temperature of the oil) at a rate of ≤10°C/h, and maintain the temperature for 4–6 hours.
• Confirmation: No visible steam at the exhaust port, stable pressure, steady oil temperature, no vapor lock, and normal pump operation.
III. Standards for Completed Oil Boiling
• No continuous steam at the expansion tank vent, only a small amount of oil vapor.
• The system pressure remains stable, with no significant fluctuations, no air hammer sounds, and no pipeline vibrations.
• The oil temperature can smoothly rise to the set temperature, and the circulating pump current is normal.
• The expansion tank liquid level is maintained at approximately one-third.
IV. Safety and Precautions
• Pump first, then power: The circulation pump must be started first, and electricity heating can only be applied after confirming normal flow. Dry burning is strictly prohibited.
• Strictly prohibit rapid temperature rise: During the critical dehydration phase of 100–130°C, slow is better than fast.
• Full-process monitoring: temperature, pressure, flow rate, current, expansion tank liquid level, and presence of leaks.
• Exhaust management: Keep the expansion tank vent valve slightly open, avoid fully opening it; ensure on-site ventilation, fire prevention, and explosion protection.
• Oil compatibility: Mixing heat transfer oils of different brands/models is strictly prohibited.
• Abnormal handling: In case of sudden pressure rise, severe vibration, or excessive oil spraying, immediately cut off power, stop heating, maintain circulation, and cool down for inspection.
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Post time: Mar-05-2026
