Vent Condenser Modifications

In some plants, vent condensers are significant emission sources because of one or more of the following conditions:

Field modifications bypass vent condensers, but the associated changes are not documented in the engineering drawings.

The vent stream is too dilute to condense because of changes in process conditions. The condenser is overloaded (e.g., the heat-transfer area is inadequate) due to gradual increases in production capacity over time. The overall heat-transfer coefficient is much lower than design because of fouling by dirty components or condenser flooding with large quantities of noncondens-able nitrogen gas. The condenser's cooling capacity is limited by improper control schemes. In one case, only the coolant return temperature was controlled.

In each case, design modifications are needed to reduce emissions.

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