Reducing Mercury Emissions From The Burning Of Coal
AssigneeNOx II, Ltd.
InventorDouglas C. COMRIE
Life of this patent
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Abstract
Sorbent components containing halogen, calcium, alumina, and silica are used in combination during coal combustion to produce environmental benefits. Sorbents such as calcium bromide are added to the coal ahead of combustion and other components are added into the flame or downstream of the flame, preferably at minimum temperatures to assure complete formation of the refractory structures that result in various advantages of the methods. When used together, the components reduce emissions of elemental and oxidized mercury; increase the level of Hg, As, Pb, and/or Cl in the coal ash; decrease the levels of leachable heavy metals (such as Hg) in the ash, preferably to levels below the detectable limits; and make a highly cementitious ash product.
Claims17
A method of operating a coal burning facility to reduce emissions of sulfur or other harmful components arising from combustion of coal in a furnace of the facility, comprising:
- adding a sorbent composition comprising a halogen to the coal;
- burning coal with the applied sorbent composition to make energy, combustion gas, and ash;
- and
- measuring a concentration of sulfur in the combustion gas, wherein no sorbent components are added into the combustion gas or in any section of the facility downstream of the furnace during the coal burning.
Dependencies are inferred from the claim text.