Ammonia-adding system for ammonia-based desulfurization device

  • US 10,159,929 B1
  • Filed: 04/16/2018
  • Issued: 12/25/2018
  • Est. Priority Date: 06/14/2017
  • Status: Active Grant
First Claim
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1. Apparatus for adding ammonia to an absorption solution in a flue-gas desulfurization system, the apparatus comprising:

  • an emission monitoring system configured to provide a measure of an output sulfur dioxide characteristic;

    valves configured to;

    add ammonia to the absorption solution at a base rate that is proportional to;

    a) a target sulfur dioxide removal rate; and

    b) a correction coefficient that includes a ratio of cumulative ammonia added to cumulative sulfur dioxide removed; and

    ,then, control ammonia addition to the absorption solution to a second rate based on the measure of the output sulfur dioxide characteristic; and

    a distributed control system configured to;

    receive a sulfur dioxide concentration at an outlet of the desulfurization system; and

    set the correction coefficient to a different value in response to the sulfur dioxide concentration.

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