• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제44회 KOSCO SYMPOSIUM 초록집
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• pp.227-229
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• 2012

Diversification of combustion fuel is the demands of the times and biomass is the most attractive option since it can contribute to the prevention of global warming at the same time. Due to the national renewable obligation, generally called Renewable Portfolio Standard (RPS), many power companies are considering direct combustion of biomass or co-firing with coal. In order to use biomass as a fuel, informations of its combustion characteristics and ash related problems should be investigated. In this study, combustion performance of biomass was assessed in a bubbling fluidized bed combustor, and ash characteristics of various biomass fuels were studied with standard test method.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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• pp.293-298
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• 2006

There are many researches in progress on co-firing of coal and biomass to reduce carbon dioxide produced from the coal consumption. This study carried out 200 Kg/h combustion test furnace by mixing coal with timber. Coal was mixed with domestic and imported-wood around 10% to 20% based on input energy. For the mixed fuel, combustion temperature, unburned carbon and the composition of flue gas were analyzed. In addition, the tendency of slagging and fouling was examined using a probe. According to the result of the experiment, combustion temperature was depended on the kind of wood and mixing ratio. The unburned carbon loss was higher with increase of wood biomass mixing ratio, as a result, the total heat loss of furnace was slightly increased. The emission of NOx and SOx were decreased by $3{\sim}20%$ and $21{\sim}60%$ respectively. There are no difference of slagging and fouling tendency between biomass co-firing and coal burning only.

• 한국수소및신에너지학회논문집
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• 제31권1호
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• pp.122-131
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• 2020

To reduce emissions from coal-fired power plants, researchers focusing on coal and biomass co-firing technology. Biomass, with its carbon-neutral nature and lower quantities of nitrogen and sulfur compared with coals, has a positive impact on coal-fired power generation. Many studies on the combustion of biomass have been conducted, but the study on the combustion characteristics of biomass char is limited. FERPM predicts char combustion characteristics with high accuracy by introducing experimental data-based parameters of biomass char and has not yet been applied in numerical simulation. In this study, FERPM is numerically applied to char combustion of wood pellets representing wood-based biomass and the combustion characteristics are compared with the kinetic/diffusion limited model, intrinsic model, and diffusion limited model.

• 한국수소및신에너지학회논문집
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• 제29권5호
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• pp.503-511
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• 2018

There have been many studies of combustion in the circulating fluidized bed. However, little study is available for combustion of wood pellet together fed with wood chip. The mixed ratio of two fuels is an useful information when thermal power company would receive the Renewable Energy Portfolio Standard (RPS) from government. In this study, the combustion behavior and kinetics of such biomass fuels are evaluated using fluidized bed reactor and thermogravimetric analyzers. The mixing ratio of wood chip relative to wood pellet was varied at different temperatures. The results show that a combustion reactivity changed significantly at the wood chip mixing ratio of 40%, particularly at low temperature condition.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2013년도 제46회 KOSCO SYMPOSIUM 초록집
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• pp.129-132
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• 2013

The low rank coal combustion and biomass-coal co-firing characteristics were reviewed on this study for the power plant construction. The importance of using low rank coal(LRC) for power plant is increasing gradually due to power generation economy and biomass co-firing is also concentrated as power source because it has carbon neutral characteristics to reduce green-house effect. The combustion characteristics of low rank coal and biomass for a 310MW coal firing power plant and a 100MW biomass and coal co-firing power plant were studied to apply into actual power plant design and optimized the furnace and burner design.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.41-44
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• 2014

This study focused on the effect of the biomass blended ratio on air-staged pulverized coal furnace. The hybrid NOx reduction technology between fuel blending and air staging has been applied in an air-staged pulverized coal fired furnace. The results indicated that co-firing biomass with coal could reduce NOx emissions in an air-staged combustion. In addition, carbon burnout and flame temperature increased under the air-staged condition. A dominant synergistic effect on NOx reduction and carbon burnout was observed when biomass co-firing with coal was applied in air staged combustion.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2015년도 제51회 KOSCO SYMPOSIUM 초록집
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• pp.285-285
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• 2015

Utilization of biomass as a substitute fuel for conventional energy systems have been grown larger everyday in the world. In particular, co-firing of biomass in a large coal power plant are common in Korea after the introduction of RPS since 2012, and the application of biomass-derived fuel is now spreading to district heating and power, industrial energy supply, and transportation sectors. For biomass to energy, appropriate conversion process is needed to satisfy the fuel requirements of a specific energy system. In this study, various kinds of thermochemical conversion technologies will be presented for renewable fuel productions from biomass.

• 한국수소및신에너지학회논문집
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• 제29권3호
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• pp.280-291
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• 2018

Torrefaction is one of the methods to increase combustion calorific value and hydrophobicity of biomass. In this study, the effects of torrefaction on devolatilization, char reactivity and biomass structure were analyzed. Empty fruit bunch (EFB) and Kenaf biomass were used as fuels to be torrefied in the N2 environment at 200, 250 and $290^{\circ}C$. Devolatilization and char kinetics were analyzed by using TGA and biomass structure was investigated through petrography image. The reactivity showed different trends depending on the torrefaction temperature and biomass structure. The herbaceous biomass, Kenaf, was shown as high reactivity and thin wall structure. On the contrary, the woody biomass, EFB, had relatively low reactivity and thick wall structure.

• 공업화학
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• 제23권5호
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• pp.456-461
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• 2012

본 연구에서는 바이오매스의 에너지 활용성을 확인하기 위하여 실험실 연소로를 이용한 등온 및 비등온 연소특성 연구를 수행하였으며 바이오매스의 시료로는 목재펠렛, 볏짚 및 왕겨를 사용하였다. 바이오매스의 연소시 배출가스의 특성과 분진 및 잔류물을 분석하였으며 그 결과를 RDF의 연소실험 결과와 비교분석하였다. 등온 연소특성 실험으로부터 볏짚이 다른 시료에 비하여 연소속도가 빨라 급격히 산소량이 감소되어 불완전연소율이 증가함을 확인하였으며 목재펠렛의 경우 다른 시료에 비하여 가장 낮은 $NO_{X}$ 배출농도를 나타내었다. 또한 비등온 연소특성 실험으로부터 모든 시료가 $900^{\circ}C$의 연소온도에 도달하기 이전에 연소가 대부분 일어남을 확인할 수 있었으며 $NO_{X}$의 경우 CO가 배출되는 범위와 유사한 온도범위에서 배출되는 반면에 $SO_{2}$의 경우보다 고온에서 배출됨을 확인할 수 있었다.

• 한국연소학회지
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• 제14권4호
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• pp.25-32
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• 2009

In commercial combustion systems, heavy oil is one of main hydrocarbon fuel because of its economical efficiency. Regarding heavy oil combustion, due to increasing concerns over environmental pollutants such as carbon monoxide, unburned hydrocarbon and nitrogen oxides, development of low pollutant emission methods has become an imminent issue for practical application to numerous combustion devices. Also a great amount of effort has been tried to developed effective methods for practical using of biomass. It is also an important issue to reduce carbon tax. In this paper, an experimental study has been conducted to evaluate the effect of biomass reburning on NOx formation in a heavy oil flamed combustion furnace. Experiments were performed in flames stabilized by a multi-staged burner, which was mounted at the front of the furnace. Experimental tests were conducted using air-carried rice husk powder and LNG as the reburn fuel and heavy oil as the main fuel. The paper reports data on flue gas emissions and temperature distribution in the furnace for several kinds of experimental conditions. NOx concentration in the exhaust has decreased considerably due to effect of reburning. The maximum NOx reduction rate was 62% when the rice husk was used by reburn fuel, however it was 59% when the LNG was used by reburn fuel. The result shows the positive possibility of biomass reburning system for optimal NOx reduction.