White Paper: SOLVAir® Select Products For Acid Gas Removal Using Dry Sorbent Injection Technology

In recent years, federal and state regulatory agencies have tightened air emission standards. Two of the acid gases, hydrochloric acid (HCl) and sulfur dioxide (SO2), are under heavy scrutiny for reduction. Although not currently regulated, SO3 is causing a great deal of concern, especially in plants that have installed SCR units to control NOx emissions. Most traditional scrubbing systems, i.e., wet scrubbers and spray dryers, meet the standards, but they typically are high in capital cost, have significant space requirements for equipment, and are difficult to maintain. Dry sorbent injection (DSI) is an alternative technology that has been shown to be effective in HCl, SO2 and SO3 removal, without the drawbacks of traditional systems.

This paper covers the mechanics of dry injection scrubbing using sodium sorbents marketed as SOLVAir Select.

It presents DSI performance data for Chambers Medical, originally located in Hampton, S.C. This facility incinerated local medical and municipal solid waste, and had begun using mechanically refined trona for HCl and SO2 removal in late 1991. The data presented is for products marketed by Solvay Chemicals Select 50 trona, which is coarse grade and Select 200 which is fi ne grade. Data are also presented for sodium bicarbonate which was supplied by another producer but can be supplied by Solvay Chemicals.

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