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A Numerical Study on Coal Devolatilization of Bituminous Coal Using CPD Model
Ryang Gyoon Kim(김량균),Byoung Hwa Lee(이병화),Chung Hwan Jeon(전창환),Young June Chang(장용준),Ju Hun Song(송주헌) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The coal considerably is the energy resource which is important with the new remarking energy resource. The coal conversion has two processes which are coal devolatilization and char oxidation. Coal devolatilization is important because it describes up to 70% weight loss and has been shown that nitrogen contribute 60 to 80% of the total NOx produced. The chemical percolation devolatilization(CPD) model is used here to describe coal devolatilization. The model was developed to describe coal devolatilization behavior of rapidly heated coal based on characteristics of the chemical structure of the parent coal. This paper describes CPD model in detail and makes an analysis of Shenhua coal(bituminous) which is used calculated 13-C NMR(carbon - nuclear magnetic resonance).
CPD 모델을 활용한 석탄 가스화 과정 중 탄종에 따른 휘발분 배출에 관한 이론해석연구
김량균(Ryang Gyoon Kim),이병화(Byoung Hwa Lee),전충환(Chung Hwan Jeon),장영준(Young June Chang),송주헌(Ju Hun Song) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.12
Integrated Coal Gasification Combined Cycle (IGCC) power plants have been developed to reduce carbon dioxide emissions and to increase the efficiency of electricity generation. A devolatilization process of entrained coal gasification is predicted by CPD model which could describe the devolatilization behavior of rapidly heated coal based on the chemical structure of the coal. This paper is intended to compare the mass release behavior of char, tar and gas(CO, CO₂, H₂O, CH₄) for three different coals. The influence of coal structure on gas evolution is examined over the pressure range of 10~30atm.
CPD 모델을 이용한 국내수입탄 성상에 따른 탈휘발 특성에 관한 실험 및 해석적 연구
김량균(Ryang Gyoon Kim),이병화(Byoung Hwa Lee),전충환(Chung Hwan Jeon),송주헌(Ju Hun Song),장영준(Young June Chang),Thomas H. Fletcher 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.8
Coal is the energy resource which is important with the new remarking energy resource. Coal combustion produces more NOx per unit of energy than any other major combustion technology. Pollutant emission associated with coal combustion will have a huge impact on the environment. Coal conversion has three processes which are drying, coal devolatilization and char oxidation. Coal devolatilization process is important because it has been shown that HCN which is converted from volatile N contributes 60 to 80% of the total NOx produced. This paper addresses mass release behavior of char, tar, gas and HCN in an experiment of Laminar Flow Reactor with two coals such as Roto middle coal (Sub-bituminous) and Anglo coal (Bituminous). The experiment is compared with the data predicted by CPD model for mass release of HCN about Roto south, Indominco, Weris creek and China orch coals. The results show that HCN increases as a function of decreasing the ratio of fixed carbon(FC)/ volatile matter(VM of the coals contain.)
CPD 모델을 활용한 석탄 탈휘발화 과정 중 탄종에 따른 HCN 배출에 관한 수치해석적 연구
김량균(Ryang Gyoon Kim),이병화(Byoung Hwa Lee),전충환(Chung-Hwan Jeon),송주헌(Ju Hun Song),장영준(Young June Chang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Coal is the energy resource which is important with the new remarking energy resource. Coal combustion produces more NOx per unit of energy than any other major combustion technology. Pollutant emission associated with coal combustion will have a huge impact on the environment. Coal conversion has three processes which are dry, coal devolatilization and char oxidation. Coal devolatilization progress is important because it has been shown that HCN which is converted from volatile N contributes 60 to 80% of the total NOx produced. This paper describes mass release of Char, Tar, Gas by CPD model about Roto middle coal (Sub-bituminous) and Anglo coal (Bituminous). CPD model also predicts mass release of HCN about the two coals. The results show that HCN increases as a function of decreasing the ratio of FC/VM.
2MW급 산업용 버너의 저 NOx 연소 최적화 기술 개발
김량균(Ryang-Gyoon Kim) 한국열환경공학회 2019 한국열환경공학회 학술대회지 Vol.2019 No.춘계
Since 2020, the Ministry of Environment has announced plans to introduce levy on NOx, which is the cause of fine dust and ozone generation, and to expand the nationwide regulation on the total amount of air pollutants currently confined to the metropolitan area. Therefore, this study aims to minimize the total amount of NOx emission through the low NOx combustion optimization technology for the 2MW large burner used in the steelmaking process heating furnace. The primary flow rate of the burner is injected into the fuel / center air / primary air through the swirl, and the secondary flow is injected with air. CFD analysis showed that the internal recirculation increased as the ratio of secondary air increased, and the temperature of the flame was widely distributed. As a result, the local high-temperature region was reduced and the NOx reduction effect was obtained.
압력상승에 따른 아역청탄 촤의 점화온도에 관한 수치해석 및 실험적 연구
김량균(Ryang Gyoon Kim),권종서(Jong Seo Kwon),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
A coal char ignition temperature at elevated pressure is important particularly in understanding the fundamental phenomena for combustion zone of coal gasification. The ignition temperature of coal char particle is obtained by a direct measurement of the particle temperature with photo detector as well as by means of a solid thermocouple which is used as both a heating and a measuring element. The ignition temperatures for subbituminous coal wira of 0.8㎜ diameter have been measured at 4 different ambient pressures in the ranging from 1 to 15bar in constant volume chamber. The result shows that the coal char ignition temperature deceases with increasing ambient pressure due to an enhanced rate of heat generation. The numerical result is agreement with an experimental data.
DAEM 분석 방법을 통한 국내 수입탄의 탈휘발화 반응특성에 관한 실험적 연구
김량균(Ryang Gyoon Kim),송주헌(Ju Hun Song),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The experiment was designed to study the pyrolysis kinetics of two different classes of coal. The pyrolysis behaviors of the coals were first observed with thermogravimetric analyzer(TGA). The kinetic analysis was further done based on a new distributed activation energy model(New DAEM). During the analysis, thermogravimetric curves measured at three different heating rates were used to obtain the activation energy distribution function curve ?(E) of a given coal sample where mean activation energy is determined by its peak. The results show a significant difference in the mean activation energy between two coals for the pyrolytic reaction.