×

Method of improving the Hg-removing capability of a flue gas cleaning process

  • US 5,435,980 A
  • Filed: 11/04/1991
  • Issued: 07/25/1995
  • Est. Priority Date: 11/04/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. In a flue gas cleaning process for elemental Hg vapor containing flue gas having a temperature of 110°

  • -170°

    C. and resulting from the combustion of coal having a chloride content insufficient to convert the elemental Hg vapor into HgCl2, in which process an aqueous suspension of a basic absorbent in a drying chamber of a drying-absorption zone comprising a dryer chamber and a particle collector as well as a duct connecting them, is atomized to fine droplets into the hot flue gas, evaporating the water of said droplets to form dry fine basic absorbent particles and in which a part of noxious components of the gas including sulphur oxides, hydrogen halides and nitrogen oxides and mercury, is simultaneously sorbed by the basic absorbent particles, whereupon the flue gas with entrained dry fine basic absorbent particles is passed to the particle collector wherein contact between the particles and the flue gas causes a further sorption of noxious compounds, wherein the improvement comprises;

    the step of increasing the amount of chloride supplied to the drying-absorption zone to a quantity sufficient to convert elemental Hg to HgCl2 to improve the Hg sequestering effect of the droplets.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×