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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.41, No.3, 403-409, 2003
Fly Ash를 이용한 흡수제의 SO2/NOx 동시제거
Simultaneous Removal of SO2 and NOx by the Absorbent from Coal Fly Ash
정종현, 손병현, 유경선, 김현규, 이형근
본 연구에서는 비산재를 첨가한 개량흡수제를 이용하여 황산화물과 질소산화물을 동시에 제거하기 위하여 고정층반응기 실험을 수행하였으며, 제조한 혼합흡수제는 SEM-EDX, ICP, BET, XRD 등을 이용하여 물성분석을 수행하였다. 소성한 석회석에 비산재를 혼합하여 수화시킨 'fly ash 개량흡수제'는 SO2와 NOx를 동시에 효율적으로 제거할 수 있었으며, 비산재를 첨가하여 제조한 개량흡수제가 첨가하지 않은 흡수제에 비하여 SO2와 NOx 동시제거에 더 효과적이었다. 이러한 실험결과는 석회석과 개량흡수제에 비산재의 첨가로 인하여 규산칼슘 등과 같은 수화물 생성으로 인하여 포졸란반응이 유도되어 'fly ash 개량흡수제'의 비표면적과 흡습성 등이 증가되었기 때문이다. 또한, 비산재를 SO2 및 NOx 동시제거용 첨가제로 활용하기 위한 비산재와 개량흡수제의 최적 첨가비율은 1:9인 것으로 나타났다.
The simultaneous removal of SO2 and NOx by advanced absorbent from coal fly ash was examined in a packed bed reactor. Also, the physicochemical properties of prepared absorbents have been measured using ICP, BET, SEM-EDX and XRD. We have found that both SO2 and NOx in simulated flue gas can be effectively removed by use of fly ash advanced absorbent which was prepared by hydration of calcined limestone with or without coal fly ash. The addition of fly ash into the absorbents can result in the highly efficient simultaneous removal of SO2 and NOx from simulated flue gas. This is because the addition of fly ash into limestone and advanced absorbent increases the specific surface area and hygroscopicity of fly ash advanced absorbents by pozzolanic reaction which leads to the formation of calcium silicate compounds. The test results indicated that the optimal mixing ratio of fly ash to advanced absorbent sample is about 1:9 for the effective removal of SOx/NOx.
Keywords: Advanced Absorbent; Fly Ash; SO2; NOx; Pozzolanic Reaction; Calcium Silicate; Waste Incinerator; Flue Gas Desulfurization
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[Cited By]
  1. Yao J, Choi JS, Yang KS, Sun D, Chung JS, Korean Journal of Chemical Engineering, 23(6), 888, 2006
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