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| Control/recovery device | Parameters to be monitored | Established operating parameter(s) | Thermal incinerator | Firebox temperature | Minimum temperature. | Thermal oxidizers used for vents in chloroprene service | Combustion chamber temperature | Minimum temperature. | Thermal oxidizers used for vents in chloroprene service | Flue gas flow rate | Maximum flue gas flow rate. | Catalytic incinerator | Temperature upstream and downstream of the catalyst bed | Minimum upstream temperature; and minimum temperature difference across the catalyst bed. | Boiler or process heater | Firebox temperature | Minimum temperature. | Scrubber for halogenated vents | pH of scrubber effluent; and scrubber liquid and gas flow rates [§ 63.489(b)(4)(ii)] | Minimum pH; and minimum liquid/gas ratio. | Absorber | Exit temperature of the absorbing liquid; and exit specific gravity of the absorbing liquid | Maximum temperature; and maximum specific gravity. | Condenser | Exit temperature | Maximum temperature. | Carbon adsorber | Total regeneration steam flow or nitrogen flow, or pressure (gauge or absolute) a during carbon bed regeneration cycle; and temperature of the carbon bed after regeneration (and within 15 minutes of completing any cooling cycle(s)) | Maximum flow or pressure; and maximum temperature. | Sorbent injection | Sorbent injection rate | Minimum injection rate. | Sorbent injection | Carrier gas flow rate | Minimum carrier gas flow rate. | Other devices (or as an alternate to the above) b | HAP concentration level or reading at outlet of device | Maximum HAP concentration or reading. |
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a 25 to 50 mm (absolute) is a common pressure level obtained by pressure swing absorbers.
b Concentration is measured instead of an operating parameter.