In cement kiln operations, brick and structural clay manufacture, energy-from-waste plants and municipal and medical waste incinerators, chlorides present in the fuel source will be converted to HCl during combustion. As most coal contains some amount of chlorine compounds, any coal-fired process will also generate HCl, and the latest proposed regulations have focused on HCI remediation. HCl, corrosive to human tissue, contributes to acid rain and the formation of smog.
The SOLVAir Approach
When used as a dry sorbent injected into a baghouse or exhaust duct, SOLVAir Select 200 trona readily reacts with acid gases.
SOLVAir Select 300 sodium bicarbonate is a safe, non-corrosive approach for Dry Sorbent Injection (DSI) applications. Sodium bicarbonate reacts very rapidly with acid gases and can achieve very high levels of acid gas removal when used properly in a DSI system.
Select 200 was tested in two separate municipal solid waste facilities for HCl removal. Select 300 indicates equal or better results in other testing and field experience.
The proposed MATS/MACT standards for both utilities and industrial boilers focus on removal of HCl. At many sites, HCl occurs in the presence of SO2. While many sites use sodium sorbents to remove HCl, and many others remove SO2 or other acid gases, publicly available data on the removal of HCl in the presence of SO2 has been scarce, until now.
SOLVAir Solutions recently conducted pilot plant tests to make this data available. The tests demonstrate the selectivity of sodium sorbents to remove HCl in a medium to high sulfur environment. Sodium bicarbonate and trona were used in two PM control devices: ESP and Baghouse. The results incontrovertibly prove that dry injection of sodium bicarbonate or trona can achieve >99% removal rates for HCl, and >90% for SO2, and is able to help plants meet the HCl limit in the upcoming MATS. Click here to access our recent presentation documenting the tests (HCl Removal in the Presence of SO2 Using Dry Sodium Sorbent Injection) or go to epa.gov for the most up-to-date regulatory information.