Desirable pH of Slurry in Desulfurization Absorber for a 1000 MW Coal Fired Power Plant

1000 MW급 석탄화력발전용 탈황흡수탑의 적정슬러리 pH

  • Published : 2019.04.10

Abstract

This research is an experimental investigation to find the desirable pH of slurry in the desulfurization absorber for a 1000 ㎿ coal fired power plant, operating in compliance with the Air Environmental Conservation Act and the plant's internal regulations. In case the average sulfur dioxide concentration in inflow flue gas, ${\bar{C\;in}}$ [ppm] changed to 500 ppm, 550 ppm, 600 ppm and 635 ppm after fixing inflow flue gas flow rate, generator output, pressure drop in the absorber, and oxidation air flow rate, the desirable pH of the slurry in the absorber, was 5.0, 5.2, 5.3 and 5.4. Thus, it is recommended that the desirable pH of slurry is calculated using the correlation equation, $RpH=0.0018{\times}{\bar{C\;in}}+4,2031$ when the average sulfur dioxide concentration in the inflow flue gas is in the range of 500 ppm to 635 ppm.

본 연구에서는 1,000 MW급 석탄화력발전소용 탈황흡수탑을 대상으로 대기환경보전법 및 발전소 자체 배출규제치를 준수하면서 운전할 때, 석회석 슬러리 투입량을 조절하여 흡수탑 내부 슬러리 pH의 적정 범위를 찾고자 하였다. 배기가스 유량, 발전기 출력, 흡수탑 압력강하, 산화용 공기량을 고정한 상태에서 흡수탑 유입가스에 포함된 이산화황의 평균 농도, ${\bar{C\;in}}$ [ppm]을 500 ppm, 550 ppm, 600 ppm 그리고 635 ppm으로 변동시키며 운전하였을 때, 흡수탑 내부 적정슬러리 pH, 는 5.0, 5.2, 5.3 그리고 5.4였다. 이러한 결과로부터 흡수탑 유입가스에 포함된 이산화황의 평균 농도가 500~635 ppm의 범위일 때 상관관계식 을 이용하여 적정슬러리 pH를 산출하여 운전하는 것이 추천된다.

Keywords

References

  1. Kyoung-Jin Hong of Department of Atmospheric Environment Policy, Ministry of Environment, 2017, Notice for Planned to Strengthen the Enforcement Rule of Air Environmental Conservation Act, Ministry of Environment, Press Releases on October 27, 2017.
  2. Minister of Environment, 2018, the Air Environmental Conservation Act, Article 16 Clause 1, Enforcement Rule Article 15 and Annex 8, Minister of Environment
  3. Korea Power Learning Institute, 2016, Practical Knowledge on Flue Gas Desulfurization System, Korea Power Learning Institute, pp. 45.
  4. Jeong-you Kim, 2008, Desulfurization Character- istics for Anthracite Coal Power Plant by Increa- sing Bituminous Coal Fuel, Hanyang University master's thesis, pp. 6.
  5. STXHI, 2016, Operation Manual 1 for Dangjin Power Plant No. 9&10, STXHI, pp. 66-101.
  6. Binlin Dou, Weiguo Pan, Qiang Jin, Wenhuan Wang and Yu Li, 2009, Prediction of SO2 Removal Efficiency for Wet Flue Gas Desulfur- ization, Energy Conversion and Management 50, pp. 2547-2553. https://doi.org/10.1016/j.enconman.2009.06.012
  7. STXHI, 2013, Material Balances for Dangjin Power Plant No. 9 & 10, STXHI. pp. 5.