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Wednesday, February 11, 2009

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Steel picklers have traditionally used carbon block heat exchangers to heat their shallow tank high turbulence pickle baths. The multi-gasketed designs and fragile nature of graphite heat exchangers still require continuous maintenance and repair which results in expensive downtime and spare parts. This has forced the industry to look for alternatives. The use of metal shell and tube heat exchangers virtually eliminates all of the problems associated with carbon block heat exchangers.

As claimed, some of the benefits of metal shell and tube heat exchangers are :
  • Cost competitive with Carbon Block Heat Exchangers
  • Easily retrofittable into existing equipment footprint
  • Elimination of downtime due to equipment failure
  • No spare parts to keep in inventory
  • Superior corrosion resistance
  • High heat transfer
  • High steam pressures to reduce required surface area
  • Fully welded metal design eliminates breakage during handling, installation and operation
  • Elimination of acid leaks into steam condensate
Typical comparison of a Carbon block HEX to a tantalum S&T HEX

Description
Carbon block HEXTantalum S&T HEX
Heat Input(BTU)1,000,0001,000,000
Steam Pressure (PSI)7575
Typical Overall U
(BTU/hrft2.F)
250 650
Surface Area Required
(Sq. Ft.)
29*11.2*
Inventory of Spare
Parts Required
YES NO
Fully Welded
Metal Design
NOYES

Basic heat transfer equation used to calculate required surface area.
*Tantalum heat exchanger surface area required does not take into consideration using a higher pressure steam.

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Source : www.titanmf.com

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