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Method of removing sulfur dioxide from a flue gas stream

  • US 7,531,154 B2
  • Filed: 08/18/2005
  • Issued: 05/12/2009
  • Est. Priority Date: 08/18/2005
  • Status: Expired due to Fees
First Claim
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1. A method of removing SO2 from a flue gas stream comprising SO2, comprising:

  • providing a source of trona, wherein the mean particle size of the trona is less than about 40 micron;

    injecting the trona into the flue gas stream, wherein the trona is injected at a rate with respect to the flow rate of the SO2 to provide a normalized stoichiometric ratio of sodium to sulfur of between about 1.0 and about 1.5, further wherein the temperature of the flue gas is between about 630°

    F. and about 900°

    F.; and

    maintaining the trona in contact with the flue gas for a time sufficient to react a portion of the trona with a portion of the SO2 to reduce the concentration of the SO2 in the flue gas stream by at least about 78%.

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