Method and apparatus for selectively reducing NOx in an exhaust gas feedstream

Method and apparatus for selectively reducing NOx in an exhaust gas feedstream

  • CN 101,219,339 B
  • Filed: 09/20/2007
  • Issued: 07/24/2013
  • Est. Priority Date: 09/20/2006
  • Status: Active Grant
First Claim
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1. one kind is reduced the method for the discharged nitrous oxides in the waste gas supply flow of internal combustion engine selectively, comprising:

  • Determine the nitrous oxides concentration of waste gas supply flow and mass flowrate and to the inlet temperature of silver-alumina catalyzation reactor assembly;

    Determine preferred hydrocarbon/nitrogen oxide than so that reduce the nitrous oxides concentration that passes silver-alumina catalyzation reactor assembly, described preferred hydrocarbon/nitrogen oxide beguine is according to the nitrous oxides concentration of waste gas supply flow, mass flowrate, change to the inlet temperature of silver-alumina catalyzation reactor assembly and oxygen concentration;

    Determine that the amount of hydrocarbon reducing agent is so that realize described preferred hydrocarbon/nitrogen oxide ratio in the waste gas supply flow of silver-alumina catalyzation reactor assembly upstream;

    WithThe amount of described hydrocarbon reducing agent is assigned in the waste gas supply flow of silver-alumina catalyzation reactor assembly upstream;

    Wherein preferred hydrocarbon/nitrogen oxide ratio comprises that working as inlet temperature is higher than 350 ℃

    , and mass flowrate is greater than or equal to 50000h -1When being higher than 200ppm with nitrous oxides concentration, the HC in 10;

    1 and 15;

    1 scope 1/ NO xRatio.

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