Full-Scale Evaluation of Sorbent Injection for Mercury Control on Power Plants Burning Bituminous and Subbituminous Coals

摘要

Under a DOE NETL cooperative agreement, ADA-ES is working in partnership with a numberof power generators and vendors on a field evaluation program of injecting sorbent, includingpowdered activated carbon (PAC), upstream of existing particulate control devices. Theobjective of this program is to obtain the necessary information to assess the costs of controllingmercury from coal-fired plants using dry injection. The economics will be developed based onvarious levels of mercury control. These tests represent the first time that PAC has been injectedon such a large scale and continuously for periods of several weeks.Three of the four full-scale tests scheduled in this program have been completed. Final resultsfrom the evaluation of carbon injection into COHPAC at Alabama Power’s Plant Gaston Unit 3burning a bituminous coal and from tests on an ESP at Wisconsin Electric’s Pleasant PrairiePower Plant Unit 2 burning a PRB coal will be presented. Preliminary results from testing on anESP with a bituminous coal will also be discussed. Tests at each site included a series ofparametric tests on different carbons and several injection concentrations, and a long-term test atoptimized conditions. Impact of sorbent injection on the particulate control devices was alsoevaluated.