Thermal oil furnace heating and dehydration process

After a thermal oil boiler cools down, its temperature rise rate must be controlled to maintain 10°C/hour. This is primarily due to the high viscosity of the oil during cooling, resulting in a low flow rate within the heating surface pipes and a thicker oil film on the pipe walls, which in turn impairs heat transfer. If the temperature rises too quickly during operation, it can easily cause the oil film temperature to overheat in certain areas. The equipment must operate within a certain temperature range to expel any residual moisture and trace amounts of moisture in the heat transfer fluid.

In a thermal oil boiler, if the exhaust volume at the expander vent pipe is high, water hammer can occur at the bottom of the unit, accelerating pipe vibration and causing significant fluctuations in pressure gauges throughout the unit. Therefore, temperature rise must be controlled to maintain a constant temperature. The thermal oil boiler door should be kept closed during operation. The duration of this period varies depending on the amount of water in the system and the quality of the heat transfer fluid, ranging from a few hours to several days.

A thermal oil boiler should not be blindly accelerated or heated to dehydrate. This is because if the water in the system rapidly evaporates, the equipment will expand rapidly, potentially causing a sudden boil-over and a rapid increase in the oil level, leading to large-scale oil spraying. The noise in the thermal oil boiler piping and within the furnace should be reduced, and the circulating oil pump will no longer experience any slack.