API PUBL 4681-1999

$87.10

Fugitive Emissions from Refinery Process Drains

Published By	Publication Date	Number of Pages
API	1999	NA

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Description

Emissions from refinery process drains are under increasing regulatory scrutiny, particularly with respect to volatile organic compounds (VOCs) and hazardous air pollutants (HAPS). Drain emissions are currently estimated using EPAs AP-42 factor for non-methane hydrocarbons. The factor is now considered obsolete because it does not reflect design modifications that have resulted in significant reductions in emissions. As a result, the AP-42 factor over-predicts emission rates in many cases. API has recently sponsored projects that investigate emissions from process drains and that develop mechanistic models to predict VOC and HAP emission rates based on mass transfer fundamentals and conservation of mass. In this project, API has funded the development of a user-friendly model called APIDRAIN that incorporates a suite of procedures for estimating emission rates from refinery process drains. In addition to the mass transfer model, APIDRAIN also provides an option to estimate emission rates using emission factors, correlation equations, and a stripping efficiency estimation procedure. Users may create process units, and within each process unit, specify the drain estimation procedure used. The level of detail in reports generated ranges from a simple facility overview to a detailed categorization of emission rates of specific chemical compounds from individual drains within each process unit. The APIDRAIN model will enable users to easily categorize drains and report drain emission rates in various process units based on the quality of collected analytical data of contaminants in process liquid or gas phase streams.

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