• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.788-791
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• 2007

기존의 미분탄 화력발전을 대체할 수 있는 차기 주자인 가스화복합발전(Integrated Gasification Combined Cycle) 기술은 단순히 열과 전기를 얻는데 그치지 않고 $CO_2$ 저감뿐만 아니라 다양한 형태의 2차 에너지원과 화학원료를 생산할 수 있는 기술이다. 상용화 운전 중인 기존의 IGCC 플랜트는 석탄 공급에 있어 건조된 미분탄(dry pulverized coal) 형태로 공급하는 건식 형태와 석탄슬러리(Coal water slurry)의 액상으로 공급하는 습식 형태로 대별되고 있다. 본 연구에서는 ASPEN plus를 이용하여 상용화 IGCC 플랜트에 대한 기본 모델을 구축하였으며, 산지별로 대상 탄종을 illinois #6(미국), Shenhua(중국), Drayton(호주)로 선정하여 가스화공정에 대한 성능을 해석하였다. 동일한 발전 출력을 얻고자 하였을 때, 석탄의 공급방식에 따라 필요한 석탄과 유틸리티 공급량과 가스화기 전${\cdot}$후단에서의 운전특성과 생성되는 합성가스(syngas) 조성, 냉가스(cold gas) 효율 및 탄소 전환율을 통해 각 case에 대한 플랜트 특성을 비교하였다.

• 한국연소학회:학술대회논문집
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• 2001.11a
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• pp.153-160
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• 2001

The combustion test used DTF was performed to obtain the characteristics of NOx emission and reduction. In this test, major factor of NOx emission was a stoichiometric air ratio. At the onset of combustion to be rich oxygen, NOx was produced rapidly. Optimum condition for NOx reduction was formed under about AR:0.7 in the combustion test of Alaska coal. Investigations were undertaken with 200KW(th) test combustor. In combustion test, the major variables were coal feed ratio of center/outer, stoichiometric air ratio at the onset of combustion. The lowest NOx emission, 182ppm(6% O2 base), was achieved at about AR:0.6 of the first combustion stage with low NOx burner. Also, unburned carbon content of char collected in this combustion condition was about 1wt%.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.4 no.4
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• pp.299-305
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• 1992

Saltation occurs in horizontal flow of solid and gas when the carrier gas velocity is small enough to permit enough to settling of the solid particles within the transport line. So we should examine the pneumatic flow system to lessen the unbured carbon in the power plant. In this paper the saltation velocity was studied on the various solid flow rate in the constant pipe diameter and on the various temperatures of the flow gas. The air velocity in the power plant transport lines was also surveyed in order to compare with the saltation velocity. As the solid flow rate increased in the constant diameter, saltation velocity increased and as the temperater of the flow gas inereased in the transport line, saltation velocity also increased.

• Journal of Advanced Marine Engineering and Technology
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• v.24 no.5
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• pp.103-110
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• 2000

A two phase compound jet, which mixes pulverized solid particles with the air in the test section, is experimentally analyzed in this study. Two phase flow is jetted 10 degree upward in the primary jet, while the secondary jet utilizes the air only. The height difference between the primary and secondary central axises is 32.5mm. The velocity vector field, concentration field, and turbulent properties of solid particles are measured by using 3-Dimensional Particles Dynamics Analyzer. When the jet angle of the secondary jet goes into effect, the solid particle recirculation zone becomes larger. Also, solid particle concentration becomes more dense due to a velocity decrement of particles.

• 한국연소학회:학술대회논문집
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• 2012.04a
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• pp.205-208
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• 2012

In this study, the thermal behavior and combustion characteristics of different ranks of coals and their blends were investigated to obtain information necessary for the evaluation of the co-processing of blends with low-rank coals. Thermogravimetric analysis(TGA) and differential thermal analysis(DTA) were carried out at different temperature from ambient temperature to $800^{\circ}C$, and a laboratory-scale pulverized coal combustion burner was used with coal feeing rate of $1.04{\times}10^{-4}kg/s$.

• 한국연소학회:학술대회논문집
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• 2002.11a
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• pp.173-184
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• 2002

In order to evaluate the devolatilization models of pulverized coal, various devolatilization models are examined for the numerical analysis of Drop Tube Furnace.The results of analysis are compared with the experimental results. A numerical study was conducted to explore the sensitivities of the predictions to variation of the model parameters. It helps to elucidate the source of the discrepancies. Three different wall temperature conditions of the DTF, 1100, 1300 and $1500^{\circ}C$ were considered in this analysis. Two fuels are U.S.A. Alaska coal and Australia Drayton coal. The results of analysis with constant rate model, single kinetic rate model and two competing rate modes well presented fast volatile matter release in the early devolatilization. However, in the latter devolatilization they did not coincide with experimental results which presented tardy volatile matter release on account of pyrolysis of high molecular substance. On the other hand, the results of analysis with DAEM(Distribute Activation Energy Model) coincided with experiment al results in overall devolatilization.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.76.2-76.2
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• 2011

석탄의 탄종별 열분해 생성물은 석탄가스화기의 뮬레이션 기법의 첫 번째 단계이며 이러한 탄종별 생성물 예측은 가스화기의 성능, 즉 가스화기 출구 가스조성, 탄소전환율, 냉가스 전환율등을 예측하는데 있어 가장 기본적이고 중요한 절차이다. 본 논문에서는 석탄가스화기내 열분해 과정을 모사할 수 있도록 석탄 성상과 가스화기 운전압력에 따라 탄종별 고온고압 열분해시의 생성물을 정량적으로 계산하는 방법을 제시하였다. Merrick(1983)의 방법을 기반으로 석탄의 성상(공업/원소분석치), 가스화기 운전압력과 몇가지 상관관계식으로부터 고온고압하 열분해 생성물을 계산하는 방법이며 이를 프로그램화하여 가스화기 시뮬레이터용 모듈로 구성할 수 있도록 하였다. 또한, 국내 수입 5개 탄종에 대하여 열분해 생성물의 조성을 구하였으며 이를 상용 열분해모델의 결과와 서로 비교하였다. 열분해 생성물 조성의 분포는 다른 상용 프로그램 결과와 부합하였으며 생성물의 발열량도 원탄의 발열량과 적합한 결과를 보여주었다.

• Journal of Energy Engineering
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• v.1 no.1
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• pp.76-86
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• 1992

A three-dimensional model has been developed for pulverized coal combusters and gasifiers. Coal devolatilization, heterogeneous char oxidation, gas particle interchange, radiation, gas phase oxidation, primary and secondary stream mixing, and heat losses are considered. A finite difference method was used to solve the ordinary non-linear differential equations. The effects of primary and secondary stream flow ratio and coal particle size are investigated.

• YAKHAK HOEJI
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• v.12 no.3_4
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• pp.72-75
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• 1968

It has been believed that "Kup kee" (Chloranthus japonica) is good for boils, or dermatopathia, and enteric fever by the Korean folks. However, there is no scientific report on its chemical ingredients and its antibacterial activities so far. The roots of Chloranthus japonica were dried and pulverized. The pulverized powder was then extracted with methanol. Then an extract was obtained by following Stas Otto's method. finally a crystal fraction was obtained through Column Chromatography. Recrystalization from methanol gave white needle crystals, m.p. $198^{\circ}C.$ Generally this compound has shown strong antibacterial effects on Gram negative bacteria. It exerts most powerful effect on Salmonella typhi. on the other hand it shows weak effect on Inaba cholera.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.6
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• pp.690-696
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• 2009

This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.