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With the advent of the 503 regulations in the early 1990s, certain states required a significant improvement to emission control systems as part of any furnace upgrade, or new furnace project.

For condensables, and particulate control, these improvements took the form of adding a wet ESP to the emissions train of multiple hearth furnaces (MHFs), after the traditional venturi tray scrubber. This added a significant electrical energy cost to the O&M budget.

The requirement for improved emission standards also triggered development work which centered on placing the scrubbing components in a proper sequence by removing the bulk of the particulate in a low energy mode, then sub cooling to condense condensables and grow heavy metal particulate for subsequent removal.

Later this technology was applied to fluid bed furnaces, and this resulted in an additional benefit. Wear in the traditional venturi throat section, which has been a point of constant maintenance, was significantly reduced.

Recently, some states have been requiring mercury controls as best available control technology on incinerators. Solutions have included adding fixed bed carbon adsorbers downstream of the emission controls or injecting carbon into the gas stream ahead of fabric filters, where used for dry ash collection.

The paper will review these technology upgrades and provide emission control data that shows the performance and improvements achieved from these.
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Document Type: Research Article

Publication date: 2005-01-01

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