Method for integration of desulphurization and denitration of coal-fired flue gas by wet method

Method for integration of desulphurization and denitration of coal-fired flue gas by wet method

  • CN 101,773,778 B
  • Filed: 01/04/2010
  • Issued: 06/26/2018
  • Est. Priority Date: 01/04/2010
  • Status: Active Grant
First Claim
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1. a kind of method for integration of desulphurization and denitration of coal-fired flue gas by wet method, it is characterised in that according in coal-fired flue-gas simultaneously have SO2WithNOXIt needs to remove, and NOXPollutant NO80%-90%, NO210%, gas -- liquid catalysis oxidation is applied while Absorption DesulfurizationWith the principle denitration of reduction, make NOXThe part NO of middle ammonia process wet desulphurization oxidized is NO2, NO2Easily by NH4OH solution absorbs,And another part NOXIt is desulfurized the The sub-salt (NH to be formed4)2SO3

  • NH4HSO3It is reduced to N2, so as to fulfill desulfurization and denitrification integral workSkill;

    It is as follows:

    A, flue gas ammonia process wet absorption desulfurization and the step of denitration, operation is:

    It is 5% using content remaining in flue gasOxygen, density <

    1200g/L containing ammonium sulfite, ammonium bisulfite desulfurization absorbing liquid in addition period 4 transition metal CuThe soluble-salt of soluble-salt and Fe for 0.3g/L and control solution ph 5.4 as catalyst, the dosage of the catalyst,Denitration temperature is to complete denitrification process under 60 DEG C of operating condition;

    Denitrification process no longer consumes NH3, NH3(NH is eventually formed4)2SO3

    NH4NO3Chemical fertilizer products;

    B, the reaction equation in this method is:

    Oxidative absorption2NO2+H2O→

    HNO3+HNO2NH4OH+HNO3

    NH4NO3+H2ONH4OH+HNO2

    NH4NO2+H2OUtilize SO2The The sub-salt that ammonia absorption generates is by NOXIt is reduced to N2

    2NO2+4(NH4)2SO3

    4(NH4)2SO4+N2

    2NO+2(NH4)2SO3

    2(NH4)2SO4+N2



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