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HWAHAK KONGHAK,
Vol.38, No.5, 706-710, 2000
Vol.38, No.5, 706-710, 2000
석탄연소로에서 소성된 석회석에 의한 암모늄 라디칼의 산화반응
Oxidation of NH3 on Calcined Limestone in a Coal Combustor
고정층 반응기와 드래프트 관을 갖는 내부 순환유동층 반응기(main bed: 0.3 m I.D.X2.0 m high, freeboard: 0.3 m I.D.X0.53 high)에서 석회석과 암모니아의 산화반응을 연구하였다. 고정층 반응기에서 주입된 암모니아는 소성된 석회석과 산소와 반응하여 대부분 NO로 전환되었으며 반응온도에는 큰 변화를 보이지 않았다. 그러나 황화된 석회석은 NH3와 반응하지 않아 NO로의 전환이 이루어지지 않았다. 내부 순환유동층 연소로에서는 석회석 투입량이 증가할수록 석탄 연소시 발생하는 암모니아 라디칼이 석회석 존재하에서 산소와 반응하여 NO 생성이 증가하였다. 따라서 유동층 연소로의 경우 탈황을 위해 공급되는 석회석의 탈황 전환율이 증가하면 NO 생성이 감소됨을 알 수 있다.
Ammonia oxidation of limestone was studied in fixed and internally circulating fluidized bed(Main bed: 0.3 m I.D.*2.0 m high, Freeboard: 0.3 m I.D.*0.53 m high) reactors. In a fixed bed reactor, injected NH3 reacted with oxygen to produce NO on calcined limestone and the effect of reaction temperature on the conversion is found to be insignificant. However, NO conversion by the oxidation of NH3 on the sulfated limestone is negligibly small due to the low selectivity of the oxidation. The higher the amount of limestone injection to the fluidized bed combustor, the more NO produces by the formation of ammonia radicals during the course of coal combustion. As the desulfurization proseeds, the less NO forms in a fluidized bed combustor employing limestone for SOx removal.
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