Dry Sorbent Injection (DSI) is the injection of powdered materials into the flue gas duct to adsorb SO2, SO3 and HCl gases. DSI can also reduce NOX to some extent. The sorbents are typically either sodium or calcium-based. Two sodium-based alternatives are sodium bicarbonate or trona. Both these products can be used for SO2 treatment and to enhance Electrostatic Precipitators (ESP) performance. Calcium-based alternatives include limestone, lime and hydrated lime. Calcium-based sorbents will not efficiently react with SO2 in DSI applications and may negatively impact ESP performance.
DSI processes are also used for mercury removal. SO3 blocks mercury adsorption sites on the fly ash. Treating the flue gas for SO3 with SOLVAir Select 200 trona or SOLVAir Select SBC sodium bicarbonate can improve mercury (Hg) removal efficiency. Powdered Activated Carbon (PAC) is a DSI treatment for enhanced mercury removal. DSI for SO3 is often done in conjunction with PAC injection to achieve higher mercury removal than PAC injection alone.
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SOLVAir Solutions - Solvay Chemicals, Inc.
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