• Magazine of RCR
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• v.10 no.2
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• pp.40-45
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• 2015

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2010.04a
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• pp.589-590
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• 2010

• Journal of Environmental Science International
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• v.18 no.7
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• pp.755-765
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• 2009

Some sections of the exhaust system to determine the shape of the duct is to suffer the difficulties by space constraints to install new equipment of the environment post-treatment for existing operation of the power plants. In this paper the large duct in flue gas desulfurization equipments of the 500MW coal-fired power plant on the current operation is numerically analyzed from induced draft fan exit to booster up fan inlet section which is in the narrow space of the exhaust system with four times bending and is connected to emergency duct to bypass the exhaust gas on the emergency operation. The procedure and method using computational fluid dynamics are proposed to maintain the stability of the guide vane with the uniform flow and a minimum pressure loss of exhaust gas in the case of normal and emergency operation between the direction of the flow of exhaust gas duct at different.

• Journal of Advanced Marine Engineering and Technology
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• v.25 no.3
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• pp.471-486
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• 2001

The principal trends in the course of emission control legislation are reviewed in this paper. In order to keep such a regulation, moreover, an inquiry ito the concrete technical possibility is conducted through review articles, Also, the composition of exhaust gases emitted from a marine diesel engine are investigated as several samples and the measures that can satisfy the value of regulation are handled with laying stress on the control methods discussed to date. It was concluded that various combined systems can be made to reduce NOx emissions without deteriorating substantially navigation costs since many technologies for reducing NOx emissions are being developed. All heat engines suffer from SOx emissions. There are two methods for reducing SOx emissions: desulfurization from exhaust gas and removal of sulfur composition from fuel oil. However it is necessary to watch the development of these technologies to evaluate which method is more favorable. Heat engines have a big problem in the regulation of environmental pollution from exhaust emissions. In the near future, however, diesel engines may be superior to other heat engines, owing to the high thermal efficiency, although the sales of individual models in dises engines may be prosperous and declining.

• KSBB Journal
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• v.17 no.3
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• pp.295-301
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• 2002

The effects of nonionic surfactant (SPAN 20) on the desulfurization process by Rhodococcus sp. strain IGTS8 have been investigated at various oil/water ratios, pHs and concentrations of surfactant. The hexadecane containing DBT was employed as model oil. The presence of surfactant in the oil/water mixture stabilized the oil/water interface, thus enhanced the efficiency of desulfurization. The volume percentages of oil in the oil/water mixture were 30, 50 and 70%. The concentrations of surfactant were varied from 0 to 0.33 wt% relative to water phase. In general, the biodesulfurization efficiencies were decreased as the concentration of SPAN 20 and the volume percentage of oil phase increased.

• Journal of the Mineralogical Society of Korea
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• v.21 no.2
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• pp.193-200
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• 2008

We tried to evaporate and dry the moisture contained Flue gas desulfurization gypsum and phosphogypsum by using the microwave directly. In the result of the heating to the Flue gas desulfurization gypsum and phosphogypsum using 2.45 GHz microwave which was created by magnetron 700 W, 1,000 W and 1,700 W, respectively. According to the increasing the microwave output intensity from 700 W to 1,700 W, the evaporate time of moisture was shortened from 10 to 3 minutes. Gypsum were changed to calcium sulfate hemihydrate. However, ${\beta}$-calcium sulfate hemi-hydrate were not changed to anhydrite.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.871-872
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• 2009

본 연구에서는 석탄가스에 함유된 $H_2O/H_2S$ 농도변화에 따른 세가지 종류의 아연계 탈황제의 반응성능을 회분식 유동층반응기에서 분석하였다. 가스화에서 생성되는 가스의 조성은 모사가스를 이용하여 입구의 $H_2O$와 $H_2S$ 농도를 변화시켜 실험을 수행하였다. $H_2O$의 농도는 5%부터 30%까지 $H_2S$의 농도는 0.5%에서 2%로 변화시켜 탈황성능을 분석하였다. 실험 결과 $H_2O$의 농도가 증가할수록 탈황성능이 감소하였다. 입구의 $H_2S$ 농도가 증가할수록 탈황반응기 후단의 $H_2S$ 농도 역시 증가하였으나, 탈황성능은 최저 99.5%로 건식탈황제를 이용하여 99% 이상의 $H_2S$ 제거 성능을 보이는 것을 확인하였다.

• 한국연소학회:학술대회논문집
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• 2002.06a
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• pp.237-246
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• 2002

가압유동층연소로(bed dia. 0.17m, freeboard dia. 0.25, total height 5m)에서 국내무연탄을 연소시켜 이에 대한 탈황특성을 고찰하였다. 실험은 압력($2{\sim}6atm$), 요동층온도(($850{\sim}950^{\circ}C$), 과잉공기(10, 20, 30,%)등의 조건과, 탈황을 위한 Ca/S몰비(($0.8{\sim}4.8$)가 탈황특성에 미치는 영향을 고찰하였다. 결과적으로, 본 연구의 실험범위에서 연소효율은 $80{\sim}99%$를 보였고, 연소온도, 압력 그리고 과잉공기가 증가 할수록 증가하였다. 배가스중의 $SO_2$배출농도는 압력, Ca/S몰비가 증가함에 따라 감소하였다. 탈황율은 상압에서 층(bed)온도의 증가에 따라 감소하였다. 운전압력이 증가함에 따라 탈황율의 감소폭이 둔화되었다. 과잉공기가 증가함에 따라 탈황율은 증가하는 경향을 나타냈다. 각각의 운전압력에서 과잉공기의 증가에 따라 약 10%의 증가폭을 보였다. 국내무연탄을 연소하는 경우 운전압력 4atm일 때 Ca/S몰비는 4이상 주입하여야 하고, 6atm일 때 Ca/S 몰비가 2.5이상주입하여야 150ppm이하를 보여 배출규제치를 만족하는 것을 보였다.

• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.540-543
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• 2000

Microbial desulfurization using a biocatalyst which is capable of selectively liberating sulfur from HDS-refractory organic sulfur compounds is an alternative biotechnology to the current technology of hydrodesulfurization. The system used in the experiments is a two phase system consisting of 0.1%(w/v) dibenzothiophene in hexadecane as model oil and a mineral medium for cell growth. Rhodococcus rhodochrous IGTS8, a desulfurization strain, was grown in flask culture at different oil phase ratio with 10% and 30%. Most of the dibenzothiophene was converted to 2-hydroxybiphenyl when the oil ratio was 10%, but wasn't when the oil ratio was 30%. However, the total degraded DBT amounts were similar. In experiments of adjusting pH to improve the efficiency of degradation, the amounts of degraded DBT were increased by 50%. When the modified medium which has two-fold nutrients than those of minimal salt medium was used, the amounts of degraded DBT were increased by 32%. When both of the methods were used, the efficiency was increased by 136%.

• Journal of Energy Engineering
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• v.12 no.2
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• pp.65-73
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• 2003

In Korea, not much interest has been paid yet to mercury among flue gas HAPs (Hazardous Air Pollutants), but mercury is expected to become a major problem in the near future. The present paper investigates the current state of mercury emission and control technologies. Interest of the U.S. and European countries in the area of air pollution has been recently directed to mercury emitted from power plants. There are largely two mercury removal technologies applied to power plants. One is removing mercury by oxidizing elemental mercury in WFGD (Wet Flue Gas Desulfurization), and the other is spraying an adsorbent such as activated carbon or other novel sorbents (low-cost sorbents). Developed country is requiring that all power plants be equipped with mercury control facilities by 2007. This paper aims at contributing to the establishment of future strategies in response to the problem.