• 플랜트 저널
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• 제17권2호
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• pp.32-41
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• 2021

최근 미세먼지 등 대기환경 문제가 국가적 이슈로 급부상 하고있는 추세이며 특히 석탄화력발전소에 대한 강도높은 환경규제치가 적용되고 있는 실정이다. 본 연구는 석탄화력발전소 주요 대기오염 배출물질인 황산화물과 먼지 제거를 위한 탈황설비 성능개선 사례에 대해 소개하고 있으며 현재 운영중인 1,000 MW 발전소의 성능개선을 위한 네가지 Case Study를 수행하고 공사를 하였다. 탈황설비 흡수탑 개조를 통해 액기비를 증대시켰으며 산화공기 유량을 증대시켜 기액 반응을 촉진하였다. 또한 가스가스히터 누설률을 개선하여 최종 탈황설비 효율을 향상시켰다. 기존 설비와 조화를 고려한 성능개선 공사를 통해 2023년부터 적용될 규제치(황산화물 25ppm, 먼지 5mg/Sm³)를 만족할 것으로 예상되며 타 화력발전소에 검토 및 적용하는데 참고될 수 있다고 기대된다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.79-84
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• 2001

The effect of spray characteristics on desulfurization yield was evaluated by performing experiments with pilot spray drying sorber (SDS). Among the variables of operating conditions, the slurry-spraying conditions were chosen as major parameters; Stoichiometric ratio and Sauter mean diameter of slurry droplet were varied for the different gas temperatures and $SO_{2}$ concentrations in the inlet gas flow. From the experimental results, we proposed semi-empirical models of desulfurization yield for both Stoichiometric ratio and Sauter mean diameter of droplets. The optimal condition of spray can be determined based on these results, which might be applied to the design or scale-up of SDS systems.

• 한국환경보건학회지
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• 제30권5호
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• pp.395-401
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• 2004

In this study, lots of methods have been studing to utilize energy and decrease contaminated effluents. There has been great progress on IGCC (Integrated gasification combined cycle) to reduce thermal energy losses. The following results have been conducted from desulfurization experiments using waste shell to remove $H_{2}S$. Unreacted core model ior desulfuriration rate prediction of sorbent was indicated. These were linear relationship between time and conversion. So co-current diffusion resistance was conducted reaction rate controlling step. The sulfidation rate is likely to be controlled primarily by countercurrent diffusion through the product layer of calcium sulfide(CaS) formed. Maximum desulfurization capacity was observed at 0.631 mm for lime, oyster and hard-shelled mussel. The kinetics of the sorption of $H_{2}S$ by CaO is sensitive to the reaction temperature and particle size at $800^{\circ}C$, and the reaction rate of oyster was faster than the calcined limestone at $700^{\circ}C$.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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• pp.43-45
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• 2012

The effect of limestone characteristics on in-furnace desulfurization was experimentally investigated at hot gas combustion condition in a drop tube furnace (DTF). Flue gas was measured by Gas analyzer in order to figure out $SO_2$ content. The experiments were performed under excess sulfur 3000ppm condition to examine the effect of operating variables such as reaction temperatures, Ca/S ratios on the $SO_2$ removal efficiencies. The results show that the $SO_2$ removal efficiency increased with reaction temperature and Ca/S ratio increase. When considering the economics, $1200^{\circ}C$ and Ca/S ratio 2 condition is optimized to reduce $SO_2$ emission.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.599-602
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• 2008

This paper deals with the optimization of Gas-Gas-Heater elements for desulfurization equipment through flow analysis. The flow analysis model used in the paper is ${\kappa}-{\varepsilon}$ turbulent flow model. Temperature and flow velocity distributions for three types of panel elements are calculated. Through the analysis the following conclusions are obtained. Firstly, pressure differences of between inlet and outlet for three types of panel elements do not exceed in the standard pressure difference. Secondly, it is expected that NU-type panel element having wide area of heat transfer will be more effective in the aspect of the heat transfer.

• 한국정밀공학회지
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• 제29권11호
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• pp.1178-1182
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• 2012

The organic linings at flue gas desulfurization systems (FGD system) in power plant have the excellent chemical properties but, lose the anticorrosive properties according to the aging with environment conditions. The properties of the organic linings depend on the manufacturing company. Therefore, the basic properties of organic linings for the preestimate of life time should be examined by conducting the aging and the bond strength test according to temperature. The pre-aging samples were compared with the post-aging samples. The temperature conditions of the aging process were 70, 150 and $200^{\circ}C$. The bond strength was calculated and the cross sections of fracture surface were examined by optical microscope and SEM. The $T_g$ was examined by DSC, DTA and TGA.

• Environmental Engineering Research
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• 제17권1호
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• pp.9-15
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• 2012

The effect of a rhamnolipid biosurfactant produced by a Pseudomonas aeruginosa MA01 strain on desulfurization of iron concentrates was studied. Surface tension measurement and frothing characterization indicated better surface activity and frothability of rhamnolipid compared to methyl isobutyl carbinol (MIBC) as an operating frother. Reverse flotation tests using rhamnolipid either as a sole frother or mixed with MIBC, showed that the desulfurization process is more efficient at pH 4.5 and high concentration of rhamnolipid in the presence of MIBC. However, under these conditions water recovery decreased due to the change in rhamnolipid aggregates morphology. Results from the present study seemed promising to introduce the biosurfactant from Pseudomonas aeruginosa as a new frother.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 B
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• pp.825-827
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• 1998

Air pollution is one of the most important global issues of the environmental concerns. Some advanced foreign countries have developed the air pollution control technology. KEPCO has been researching on the air pollution control technology and developed the FGD(Flue Gas Desulfurization) system for 200MW thermal power plant. In this paper, we describe the major control loops implemented to the domestic FGD system. The major control loops are to be classified into booster fan control, absorber PH control and limestone density control. The control loops were applied to the actual desulfurization processes and proved to their performance.

• Korean Chemical Engineering Research
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• 제50권3호
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• pp.492-498
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• 2012

본 연구에서는 고온고압 건식탈황장치를 이용하여 고체순환량과 탈황반응기 내의 공극률에 대한 수력학적특성을 파악하고, 아연계 탈황제의 고온고압 조건에서 탈황반응온도에 대한 반응특성 및 연속운전을 통한 탈황 효율을 분석하였다. 실험에 사용된 고온고압건식탈황장치는 고속유동층 형태의 탈황반응기(내경: 0.015 m, 높이: 6.2 m), 기포유동층 형태의 재생반응기(내경: 0.053 m, 높이: 1.6 m), 가스의 역흐름을 방지하는 loop-seal, 두 반응기 후단에 압력컨트롤밸브로 구성되어있다. 수력학 특성으로는 고체순환밸브 개구비, 탈황반응기 가스 유속, 탈황반응기 온도 변화에 따른 고체순환량과 각 조건에서의 고속유동층 형태의 탈황반응기 높이에 따른 공극률 분포를 알아보았다. 고체순환량은 동일한 유속조건, 동일한 고체순환밸브 개구비에서 탈황반응기 온도가 상온일 때보다 $300^{\circ}C$와 $550^{\circ}C$일 때 감소하였으며 $300^{\circ}C$와 $550^{\circ}C$ 조건에서는 큰 차이가 없었다. 탈황반응기내의 공극률은 고체순환밸브 개구비가 10~20%로 고체순환량이 적은 경우 고속유동층 형태의 공극률 분포를 보이고, 30~40%로 고체순환량이 많아지는 경우 탈황반응기 하부에서 turbulent 형태의 공극률의 분포를 나타냈다. 아연계 탈황제의 탈황반응온도에 따른 반응특성은 시스템 압력 20 atm, 연속 반응 조건에서 탈황 온도를 변화시키면서 살펴보았다. 일정한 고체순환 조건에서 탈황온도 $450^{\circ}C$ 이하에서 탈황 효율 저하가 시작되는 것을 확인하였으며, 높은 탈황 효율을 유지시키기 위하여 10시간 연속운전에서는 탈황 반응 온도를 $500^{\circ}C$로 설정하여 실험하였다. 실험 결과, 10시간 연속운전을 통해, 유입 $H_2S$ 농도 5,000 ppmv 조건에서 탈황 반응기 후단 $H_2S$ 농도는 UV분석기(Radas2)와 검지관(GASTEC)의 검출한계인 1 ppmv 이하를 유지하여 $H_2S$ 제거 효율 99.99% 이상을 달성하였다.

• 대한환경공학회지
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• 제33권6호
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• pp.420-425
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• 2011

순산소연소 조건하의 로내 탈황공정에서 황화반응 생성물인 $CaSO_4$의 재분해가 탈황반응에 미치는 영향이 크다. 본 연구에서는 DTF (Drop Tube Furnace)를 이용하여 반응온도, $CO_2$, $O_2$, $SO_2$, 농도 등을 포함한 다양한 실험 변수들이 $CaSO_4$ 탈황반응에 미치는 영향을 파악하기 위하여 분해반응의 전환율을 측정하고 반응속도를 계산하였다. 반응온도가 상승함에 따라 $CaSO_4$ 분해반응의 전환율과 반응속도가 증가하였고 $O_2$가 존재하는 조건에서 $CO_2$ 농도의 영향은 크지 않았다. 동일한 조건에서 $CaSO_4$ 분해속도는 $O_2$ 농도가 감소함에 따라 증가하였으나 $SO_2$ 농도가 증가함에 따라 감소되었다.