HBS Injection
HBS InjectionTM is a technology for mercury oxidation and control that reduces or eliminates reliance on costly powdered activated carbon (PAC) for MATS compliance. A patented process offered exclusively by AECOM Process Technologies, HBS InjectionTM involves the injection of a halogen-based solution (HBS) into flue gas, which reacts in-situ to form halogen species that effectively oxidize elemental mercury to a water-soluble species. The process has been demonstrated at full-scale to reduce elemental mercury levels in the flue gas by more than 75%, with a corresponding reduction in stack mercury emissions for plants operating wet (or semi-dry) FGD processes.
The halogen-based solution can be co-injected with the SBS InjectionTM process, greatly simplifying the system design and capital cost; or it can be injected using a simple stand-alone system. When combined with the SBS Injection process, mercury emission reductions of up to 90% can be achieved.