Boiler MACT • HCl Control with Dry Sorbent Injection and the Impact on By-Product Residue, 2013 PEERS Conference

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Due to the recent finalization of the Industrial Boiler MACT, controlling Hydrochloric acid (HCl) and other acid gas emissions from industrials is gaining interest with boiler owners and operators, specifically those using coal and/or biomass. Dry Sorbent Injection (DSI) with hydrated lime has proven to be an effective technology option for control of these acid gases in many situations affording a lower capital cost solution as compared to traditional scrubber technology. This paper addresses DSI equipment configuration and considerations, factors that are key in the effectiveness of DSI, as well as balance of plant issues that should be considered when contemplating DSI, specifically by-product residue reuse or disposal. It can be concluded from this work that DSI using high quality hydrated lime can be an effective control option for some utility and industrial boilers in managing HCl and other acid gas emissions required by emerging regulations while minimizing by-product issues.