Enhanced mercury control in coal-fired power plants
DC CAFCFirst Claim
1. A method of treating coal combustion flue gas containing mercury, comprising:
- injecting a member selected from the group consisting of molecular halogen and a thermolabile molecular halogen precursor into said flue gas to effect oxidation of elemental mercury to a mercuric halide and providing alkaline solid particles in said flue gas ahead of a particulate collection device, in order to adsorb at least a portion of said mercuric halide.
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Abstract
A method of treating a coal combustion flue gas, which includes injecting a molecular halogen or thermolabile molecular halogen precursor, such as calcium hypochlorite, able to decompose to form molecular halogen at flue gas temperature. The molecular halogen converts elemental mercury to mercuric halide, which is adsorbable by alkaline solids such as subbituminous or lignite coal ash, alkali fused bituminous coal ash, and dry flue gas desulphurization solids, capturable in whole or part by electrostatic precipitators (ESPs), baghouses (BHs), and fabric filters (FFs), with or without subsequent adsorption by a liquid such as a flue gas desulphurization scrubbing liquor.
190 Citations
18 Claims
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1. A method of treating coal combustion flue gas containing mercury, comprising:
injecting a member selected from the group consisting of molecular halogen and a thermolabile molecular halogen precursor into said flue gas to effect oxidation of elemental mercury to a mercuric halide and providing alkaline solid particles in said flue gas ahead of a particulate collection device, in order to adsorb at least a portion of said mercuric halide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification