What is the principle of the reboiler forced circulation line?
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Our facility has some reboilers, and there is a forced circulation line that runs from the feed line or the bottom of the tower pump to the bottom of the reboiler. This line is used when the heating process starts slowly; it enables rapid heat exchange. Does anyone know what the principle behind this is?
The principle is generally as follows: during startup, shutdown, or at the beginning of operation, especially for materials with high viscosity or a tendency to coking, it is difficult to establish a circulation in the reboiler or at the bottom of the tower. If forced circulation is used, external forces can help establish this circulation quickly; once such circulation is established, forced circulation can be completely discontinued, and natural circulation can be used instead. . . . . . The most troublesome part is the initial stages before this natural cycle is established; once it’s set up, as long as operations continue without interruption, it will function naturally through its own cycle