Adding a Hot Bypass on RTOs with High VOC Concentrations
Hot bypass is typically installed in systems where the VOC concentrations may exceed 5% of the LEL (Lower Explosion Limit). The hot bypass does not increase the RTO flow capacity.
Approximately, 30% of S&SE RTOs use hot bypass.
When VOC in the emission stream reaches higher than normal, a hot bypass may be needed. In these cases, a motor operated valve is used to respond to a signal from the temperature controller to release excess heat and reduce the chances of overheating the RTO.
As high concentrations of VOC’s pass through the RTO the temperature in the combustion chamber will rise and at a pre-set temperature open the hot by-pass to allow a portion of the hot products of combustion to directly exit to the exhaust stack, without passing through the media, thus insuring that the media remains at a stable temperature. The hot bypass valve and components in contact with the 1500F exhaust gases are manufactured of a special gauge of Stainless steel or Inconel.
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