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Title: Thief process for the removal of mercury from flue gas

A system and method for removing mercury from the flue gas of a coal-fired power plant is described. Mercury removal is by adsorption onto a thermally activated sorbent produced in-situ at the power plant. To obtain the thermally activated sorbent, a lance (thief) is inserted into a location within the combustion zone of the combustion chamber and extracts a mixture of semi-combusted coal and gas. The semi-combusted coal has adsorptive properties suitable for the removal of elemental and oxidized mercury. The mixture of semi-combusted coal and gas is separated into a stream of gas and semi-combusted coal that has been converted to a stream of thermally activated sorbent. The separated stream of gas is recycled to the combustion chamber. The thermally activated sorbent is injected into the duct work of the power plant at a location downstream from the exit port of the combustion chamber. Mercury within the flue gas contacts and adsorbs onto the thermally activated sorbent. The sorbent-mercury combination is removed from the plant by a particulate collection system.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. (Bethel Park, PA)
  2. (Wexford, PA)
  3. (South Park Township, PA)
  4. (Canonsburg, PA)
  5. (Charleroi, PA)
Publication Date:
OSTI Identifier:
875052
Report Number(s):
US 6521021
US patent application 10/040,758
Resource Type:
Patent
Research Org:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
Country of Publication:
United States
Language:
English
Subject:
thief; process; removal; mercury; flue; gas; method; removing; mercury; flue; gas; coal-fired; power; plant; described; mercury; removal; adsorption; thermally; activated; sorbent; produced; in-situ; power; plant; obtain; thermally; activated; sorbent; lance; thief; inserted; location; combustion; zone; combustion; chamber; extracts; mixture; semi-combusted; coal; gas; semi-combusted; coal; adsorptive; properties; removal; elemental; oxidized; mercury; mixture; semi-combusted; coal; gas; separated; stream; gas; semi-combusted; coal; converted; stream; thermally; activated; sorbent; separated; stream; gas; recycled; combustion; chamber; thermally; activated; sorbent; injected; duct; power; plant; location; downstream; exit; combustion; chamber; mercury; flue; gas; contacts; adsorbs; thermally; activated; sorbent; sorbent-mercury; combination; removed; plant; particulate; collection; combustion chamber; combustion chamber; combustion chamber; combustion zone; power plant; power plant; power plant; flue gas; flue gas; flue gas; thermally activated /95/96/110/423/