Performance Enhancement of Flue Gas Desulfurization System with Structural Constraints in 500 MW Coal Fired Power Plants

구조적 제약조건을 갖는 500 MW 석탄화력발전소 탈황설비의 성능개선

  • Received : 2018.06.08
  • Published : 2019.12.30

Abstract

To meet both increasing social demand for reduction of fine dust and the strengthened air pollutant emission standards, this paper indicated performance enhancement of FGD with structural constraints in 500 MW coal fired thermal power plant's. Through modifying internal facilities for flue gases to make swirl in the absorption tower, it made turbulence and increased the efficiency of material transfer, the reaction area and time with the limestone slurry. Therefore, it could reduce dust and enhance the performance of collecting the SO2. As a result, desulfurization efficiency was improved from 91.61% to 98.43% and dust removal efficiency was improved from 77.4% to 87.08%. Emission density is 7.85 ppm of SO2 and 4.67 mg/㎥ of dust. This is a level that satisfies emission limit of 25 ppm of SO2 and 5 mg/㎥ of dust which are the air pollutant emission standards of 2023. The performance enhancement method of this study is expected to be effectively applied to other coal-fired power plants with similar constraints.

미세먼지 감축에 대한 사회적 요구 증가와 강화되는 대기오염물질 배출허용기준을 충족시키기 위해 구조적 제약조건을 갖는 500 MW급 석탄화력발전소 탈황설비의 성능개선 방안을 제시하였다. 탈황설비 흡수탑을 통과하는 배기가스가 선회하도록 내부 설비를 개조하여 난류를 형성시켜 물질전달효율을 증가시키고 반응 면적 및 시간을 증가시킴으로써 황산화물 저감 및 먼지 포집 능력을 향상시킬 수 있었다. 개선결과 황산화물 제거효율은 91.61%에서 98.43%로 향상되었고 먼지 제거성능은 77.4%에서 87.08%로 향상되었다. 배출농도는 황산화물 7.85 ppm, 먼지 4.67 mg/㎥이 배출되어 2023년의 대기오염물질 배출허용기준인 황산화물 25 ppm, 먼지 5 mg/㎥을 만족하는 수준이다. 본 연구의 성능 개선 방식은 유사한 제약조건을 갖는 다른 석탄화력발전소에도 효과적으로 적용될 수 있으리라 기대된다.

Keywords

References

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