Ammonia-adding system for ammonia-based desulfurization device

  • US 10,583,386 B2
  • Filed: 10/12/2018
  • Issued: 03/10/2020
  • 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; and

    valves configured to;

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

    a) a target sulfur dioxide removal rate defined as a difference between;

    1) a product of;



    a gas flow rate corresponding to an inlet of the desulfurization system and an inlet SO2 concentration; and

    2) a product of;



    a gas flow rate corresponding to an outlet of the desulfurization system and a predetermined SO2 outlet concentration; 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 steam generation rate from a boiler that produces the flue gas; and

    calculate an amount of required ammonia based, at least partly, on the steam generation rate,wherein the gas flow rate corresponding to the outlet is evaluated as the steam generation rate.

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