Dry sorbent injection (DSI) is a pollution-control technology that may play a role in the United States' electric power sector's compliance with the Mercury and Air Toxics Standards (MATS).
The Environmental Protection Agency (EPA) finalized the MATS rule in December. The MATS rule requires that all U.S. coal- and oil-fired power plants greater than 25 megawatts meet emission limits consistent with the average performance of the top 12% of existing units – known as the maximum achievable control technology (MACT).
DSI and flue gas desulfurization (FGD) scrubbers (both wet and dry scrubbers) are the technologies that will allow plants to meet the MATS for HCl and other acid gases.
