January 2019

Heat Transfer

Transient analysis of fired heater coils to estimate safety time

During the operation of process fired heaters, the potential exists for sudden interruption of process flow.

This can be caused by a pump trip or accidental closing of a valve at the inlet line. When the process flow is tripped, the fuel must be cut off to protect the process coils. The heat input to the unit must be immediately stopped to prevent overheating and degrading the fluid inside the coil, and to avoid possible tube failure due to over-pressure and temperature. The control loop has some inherent time delay before the fuel shutoff valve of the heater is fully activated to prevent additional fuel input to the system. It is critical to ensure that fuel input is fully stopped to prevent degradation of process fluid or process coils. Estimating this safety time has been a focus for technica

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