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바이오매스 가스화발전 vs 직접 연소 후 스팀터빈 발전의 경제성 비교
문지홍(Ji Hong Moon),방병열(Byung Ryeul Bang),이은도(Uen Do Lee),이정우(Jung Woo Lee),황의정(Eui Jeong Hwang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
Economic feasibility of power generation system of biomass syngas engine and direct combustion of biomass with steam turbine was investigated. Due to the low energy density of biomass, there is a limit in the capacity of biomass power generation plant. In this study, small scale biomass power generation plants ranging from 0.5㎿e to 5㎿e was considered. As a result, syngas engine system using bio-syngas is more economical than steam turbine system at low capacity system. The steam turbine system becomes better than syngas engine if the capacity is over 5MWe.
전주희(Ju Hee Jun),곽영태(Young Tae Guahk),송재헌(Jae Hun Song),방병열(Byung Ryeul Bang),이은도(Uen Do Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
The IEA CFBC(Circulating Fluidized Bed Combustion) model is designed to describe the overall performance of a CFB combustor. It consists of various sub-models of fluid dynamics, particle fragmentation and attrition, mass and energy balance, coal heterogeneous and gas homogeneous chemical reactions as well as heat transfer to membrane walls and to tube bundles. This model was originally developed for investigating coal combustion in a CFBC boiler and predicting the gas emission after the combustion. We applied this code to biomass, which has different characteristics from coal, with some modifications such as fuel characteristics and combustor geometry. With these modifications we could obtain the reasonable results of biomass combustion which are comparable to coal combustion.
바이오매스 합성가스를 이용한 엔진 발전 시스템의 경제성 평가
문지홍(Ji Hong Moon),이정우(Jeung Woo Lee),방병열(Byung Ryeul Bang),김세원(Se Won Kim),이은도(Uen Do Lee) 한국열환경공학회 2010 한국열환경공학회 학술대회지 Vol.2010 No.추계
Biomass, a carbon neutral fuel, is one of the fastest growing renewable energy sources. In this study, economic feasibility of small scale power generation system using syngas from biomass has been investigated. Effects of important variables such as capital investment, cost of waste wood, renewable energy certificate(REC), system marginal price(SMP) on the benefit of business have been analyzed. Internal rate of return(IRR) was predicted as 16.90%, which implicates the business is promising based on the assumptions such as SMP of 137 Won/kWh, capital cost of 4.7 billion won, and waste wood price of 30 thousand won. Major factors affecting the benefit of business are as follows; system marginal price, operational rate, capital investment, expenditure of waste wood, certified emission reduction.
Tube furnace를 이용한 바이오매스의 스팀 가스화 연구
성연경(Yeon Kyung Sung),최인환(In Hwan Choi),방병열(Byung Ryeul Bang),유미정(Mi Jung Yu),류태우(Tae U Yu),이은도(Uen do Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
In this study, a fundamental study of biomass gasification was conducted in a tube furnace. Syngas compositions and gas yield are monitored as a function of time with different temperature and steam to biomass ratio. Syngas is mainly composed of hydrogen, carbon monoxide and methane. The gasification process can be separated in devolatization and char gasification, and syngas production is highly influenced by the gasification temperature and steam amount. Adding steam enhances the char gasification and hydrogen yield is significantly affected by the steam and gasification temperature.
김영두(Young Doo Kim),정효재(Hyo Jae Jeong),최인수(In Soo Choi),김세원(Se Won Kim),방병열(Byung Ryeul Bang),이은도(Uen Do Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
A preliminary result of an air-blown biomass gaisifier will be presented. The type of the gasifier is a bubbling fluidized bed and saw dust is used as a feedstock. This gasifier is desinged for producing low caloric value syngas for co-combustion or syngas engine combustion. The gaisifier is equipped with a combustion chamber for heat up the system and controlling the gasification agent by adding an additional fuel or steam. In this study, temperature elevation characteristics of the gasifier and syngas composition are investigated as a function of the amount of air and fuel. The syngas composition is highly affected by O/C ratio and up to 15.16% of CO, 6.2% of H₂, and 3.98% of CH₄ were obtained with air only case.
양동진(Dong-Jin Yang),최신영(Shin-young Choi),신명철(Myung-Chul Shin),김세원(Se-Won Kim),방병열(Byung-Ryeul Bang),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Experiments were performed to development of low NOx burner for 5ton/hr industrial boiler, through flue gas analysis. Main flue gas characteristics are NOx and CO concentrations. Goal of the NOx emission in this research is NOx of below 130ppm. So Two swirlers were designed for redusing NOx. swirlers were designed inlet area of 1st air and 2nd air differently for experiment. Gas analyzer was used to analyze NOx and CO concentrations. Through the experiments, We can obtain such goals as the low NOx of below 130ppm, CO of below 10ppm corrected at O₂ 4%.
최종균(Chong Gun Choi),나익환(Ik-Hwan Na),이재욱(Jae Wook Lee),채태영(Tae Young Chae),방병열(Byung Ryeul Bang),양원(Won Yang) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study is aimed to derive design parameters of an oxy-PC burner through investigating combustion characteristics of an oxy-fuel combustion test unit by experimental approach. For various design parameters, temperature distributions were observed for air and oxy-fuel conditions. Among these, effects of various O₂ concentration in the total oxidant and O₂ concentration of primary oxidizer stream was evaluated. We found that NOx emission in the operating conditions of oxy-PC is lower than those of air-PC, and temperature distribution of oxy-27% in the oxidizer is similar to air-PC than other oxy conditions. Meanwhile, if O₂ concentration of primary oxidant reaches a certain level that those is not significant parameter in flame stability expressed by CO emission. However, more investigation should be performed for design of a real-scale oxy-PC burner.
Dual Fluidized Bed를 이용한 바이오매스 가스화 Pilot plant 개발
송재헌(Jae Hun Song),성연경(Yeon Kyung Sung),김영두(Young Doo Kim),정효재(Hyo Jae Jeong),최인수(In Soo Choi),최영태(Young Tae Choi),방병열(Byung Ryeul Bang),이은도(Uen Do Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
In this study, development procedure of a pilot-scale dual fluidized bed gasifier for biomass will be presented. To get a design parameter and optimum operating conditions of a pilot-scale gasifier, detailed experiments were conducted in a lab-scale bubbling fluidized bed gasifier and a cold flow model. Characteristics of syngas was investigated in a lab-scale gasifier as a function of bed temperature and steam/biomass ratio, and hydrodynamic of a dual fluidized bed was investigated in a cold flow model. A preliminary result of a pilot-scale gasifier will be also presented.