Process and device for desulphurization and denitration of flue gas

  • US 9,895,661 B2
  • Filed: 06/04/2015
  • Issued: 02/20/2018
  • Est. Priority Date: 06/05/2014
  • Status: Active Grant
First Claim
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1. A flue gas desulfurization-denitration process, comprising the following procedures:

  • 1) afterheat recovery procedure;

    the temperature of the flue gas is lowered to below 50°

    C. in a heat exchange recovering way, and afterheat recovery is carried out;

    2) desulfurization-denitration procedure;

    the cooled flue gas enters into an absorption tower, sulfur dioxide and/or nitrogen oxides therein are absorbed by a desulfurization-denitration solution, and the said desulfurization-denitration solution is a composite solution containing polyol and/or polymeric polyol;

    3) regeneration procedure of desulfurization-denitration solution;

    in a regeneration tower, the desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by ways of heating and/or gas stripping and/or vacuum regeneration, and the desulfurization-denitration solution after regeneration is recycled for use;

    4) sulfur dioxide and/or nitrogen oxides concentration procedure;

    in a concentration tower, sulfur dioxide and/or nitrogen oxides released by the regeneration procedure of the desulfurization-denitration solution are concentrated into a product of sulfur dioxide and/or nitrogen oxides with a higher purity.

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