Reboilers, or vaporizers, are heat exchangers that provide heat to the bottom of a distillation tower. They boil the bottom liquid to generate vapors which are returned to the tower to drive the distillation separation process. The reboiler may partially or completely vaporize the stream it receives from the bottom of the tower. Proper reboiler operation is crucial for distillation to be effective, and high-quality level instrumentation can ensure reboilers function correctly.
Magnetrol® has produced a brochure detailing different applications throughout the [reboilers] chemical industry and exploring measurement challenges and solutions for each one. This blog post is part of an occasional series exploring each application in detail.
Level Measurement Challenges and Considerations
Excess reboiler liquids (bottoms or blow-down) overflow a baffle where level is controlled by means of a level controller. If the reboiler level becomes too low, it will affect the maximum flow rate of bottoms product that can be drawn off. Inaccurate reboiler level can also degrade composition control for material balance control configurations.
Level Instrument Solutions
MAGNETROL offers a range of level instrumentation solutions for reboilers:
- For point level measurement
Series 3 float-activated external cage level switch or Tuffy® II float-actuated switch
- For continuous level measurement
Eclipse® Model 706 guided wave radar transmitter or E3 Modulevel® displacer-actuated transmitter
- For visual indication
Atlas™ or Aurora® magnetic level indicators can be supplied with switches or transmitters