Heat exchanger bake out process

Heating – Processes of heating or heater operation – Including apparatus purging – cleaning or accretion preventing

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Details

432180, 432181, F27D 1700

Patent

active

055384200

ABSTRACT:
A heat exchanger burn-out process for regenerative thermal oxidizers includes the steps of passing a super-heated gas through one of the heat exchangers and into the combustion chamber. The gas is preferably heated in a selectively opened injection line that includes a burner. The burner is designed to superheat the injection gas to a cleaning temperature. The cleaning temperature is selected to be high enough as to volatilize and/or combust the organic solids that are expected within the heat exchanger. The injection line is associated with one of the heat exchangers, and the other two of the normal three heat exchangers on the regenerative thermal oxidizer are switched between a supplemental injection mode, wherein cooling gas is injected through that heat exchanger, and an outlet mode wherein gas from the combustion chamber leads outwardly through the heat exchanger to an outlet manifold. The supplemental injection line reduces the overall temperature of the gas leaving the system through the outlet manifold. In one embodiment, the heated injection line is associated with the inlet manifold, and the supplemental injection line is associated with the purge manifold. In a second embodiment, the heated injection line is associated with the purge manifold and the supplemental injection line is associated with the inlet manifold.

REFERENCES:
patent: 5101741 (1992-04-01), Gross et al.
patent: 5240403 (1993-08-01), McAnespie
patent: 5259757 (1993-11-01), Plejdrup et al.
patent: 5297954 (1994-03-01), Colagiovanni

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