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Sorbents for coal combustion

  • US 9,945,557 B2
  • Filed: 06/27/2017
  • Issued: 04/17/2018
  • Est. Priority Date: 03/17/2005
  • Status: Active Grant
First Claim
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1. A method for burning coal in a furnace to reduce emissions of mercury from a coal burning facility, the method comprising:

  • adding a mercury sorbent composition onto the coal upstream of the furnace, into the flue gases in a plant section of the facility downstream of the furnace, or in a combination of upstream and downstream additions;

    adding a sulfur sorbent composition onto the coal upstream of the furnace, into the flue gases in a plant section of the facility downstream of the furnace, or in a combination of upstream and downstream additions;

    combusting the coal in the furnace;

    measuring the level of mercury present in the flue downstream from the addition of sorbent compositions; and

    if the measured mercury level is above a target level, increasing a rate of addition of the mercury sorbent composition;

    orif the measured mercury level is below a target level, decreasing a rate of addition of at least one of the components or leaving the rate of addition unchanged, wherein the mercury sorbent composition comprises a halogen compound and the sulfur sorbent composition comprises silica and alumina.

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