Reducing mercury emissions from the burning of coal
First Claim
1. A method for preventing release of mercury into the atmosphere from combustion of coal, comprising delivering coal into a furnace at a coal feed, combusting the coal in the furnace, and adding sorbent components into the furnace during combustion, wherein the components comprise iodine, silica, and alumina.
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Accused Products
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.
162 Citations
22 Claims
- 1. A method for preventing release of mercury into the atmosphere from combustion of coal, comprising delivering coal into a furnace at a coal feed, combusting the coal in the furnace, and adding sorbent components into the furnace during combustion, wherein the components comprise iodine, silica, and alumina.
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16. A method of burning coal to reduce emissions of mercury or other harmful substances into the environment, the method comprising:
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burning coal in a furnace to produce heat energy and combustion gases; adding sorbent components into the furnace or into a convective pathway downstream of the furnace where the temperature is 500°
C. or higher;wherein the components comprise iodine, silica, and alumina. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification