Plate & Frame Heat Exchanger
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Problem:
A plate and frame heat exchanger having 140
titanium plates with 14" feed (carbon steel) pipes was used to
extract heat from a 7 - 8% brine solution whose temperature ranged 90
- 100 degrees C
and hardness varied from 100 to 400 mg/L. The brine solution was
cooled using a fresh water which was pumped to the other side of the
heat exchanger. Scaling occurred in both sides of the heat exchanger,
reducing the heat transfer coefficient by 20% every two weeks.
Scale build-up would force the plant to acid clean the heat
exchanger every 6 - 8 weeks.
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Solution:
Two Electronic Descaling 2000 units were
installed: one on the brine inlet to the plate and frame heat
exchanger and the other on the fresh water inlet.
- The plate and frame heat exchanger now
operates continuously at the almost designed performance level.
The overall heat transfer coefficient of 650 Btu/hr ft2 degrees F
dropped only to 550 Btu/hr ft2 degrees F after 10 weeks of operation.
- Downtime has been reduced almost to zero.
- Labor costs for maintenance has been drastically reduced.
- Chemicals and chemical disposal has been eliminated.
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