Full-scale evaluation of mercury control with sorbent injection and COHPAC at Alabama Power E.C. Gaston.
The overall objective of this project was to determine the cost and impacts of Hg control using sorbent injection into a Compact Hybrid Particulate Collector (COHPAC) at Alabama Power's Gaston Unit 3. This test is part of a program funded by the U.S. Department of Energy's National Energy Technology Laboratory (NETL) to obtain the necessary information to assess the costs of controlling Hg from coal-fired utility plants that do not have scrubbers for SO2 control. The economics will be developed based on various levels of Hg control. Gaston Unit 3 was chosen for testing because COHPAC represents a cost-effective retrofit option for utilities with existing electrostatic precipitators (ESPs). COHPAC is an EPRI-patented concept that places a high air-to-cloth ratio baghouse downstream of an existing ESP to improve overall particulate collection efficiency. Activated carbons were injected upstream of COHPAC and downstream of the ESP to obtain performance and operational data. Results were very encouraging, with up to 90% removal of Hg for short operating periods using powdered activated carbon (PAC). During the long-term tests, an average Hg removal efficiency of 78% was measured. The PAC injection rate for the long-term tests was chosen to maintain COHPAC cleaning frequency at less than 1.5 pulses/bag/hr.
ADA-ES, LLC, Littleton, Colorado 80120, USA.
C Jean
CJ
Bustard
Michael
M
Durham
Charles
C
Lindsey
Travis
T
Starns
Ken
K
Baldrey
Cameron
C
Martin
Richard
R
Schlager
Sharon
S
Sjostrom
Rick
R
Slye
Scott
S
Renninger
Larry
L
Monroe
Richard
R
Miller
Ramsay
R
Chang
D000327:Adsorption; D000397:Air Pollution / Q000517:prevention & control*; D002244:Carbon / Q000032:analysis; D003031:Coal; D004784:Environmental Monitoring; D004867:Equipment Design; D008628:Mercury / Q000737:chemistry*; D011210:Power Plants
D003031:Coal; D002244:Carbon; D008628:Mercury