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접선연소식 보일러에서 미분탄 연소 시 공기 배분의 영향에 대한 전산해석연구
강기섭 ( Kieseop Kang ),류창국 ( Changkook Ryu ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.4
본 연구는 560 MWe급 접선연소식 미분탄 보일러에서 공기단계연소에 의한 연소 및 NOx 배출 특성과 슬래깅성에 대하여 분석한 것이다. 이를 위해 고급 석탄 연소 모델이 적용된 전산유체역학(CFD) 시뮬레이션을 이용하여 전체 연소공기의 당량비(SR)는 1.2로 고정하고, 버너 영역의 SR을 0.94에서 0.995까지 변화시켰다. 공기 배분의 변화에 따라 버너 영역 및 열교환기의 온도 및 전열량 분포가 변하지만 보일러의 전체 효율은 거의 동일하게 나타났다. 버너 영역의 SR이 0.94로 낮아지면 Fuel NO의 생성이 억제되어 절탄기 출구 NOx 배출량은 20% 감소하나, 미연분과 슬래깅성에는 큰 영향이 나타나지 않았다. 따라서, 이 보일러에서 NOx 배출 저감을 위해 공기배분을 조절하여 버너 영역의 SR를 낮추고 상부연소공기(OFA)의 값을 높여 운전하는 것이 타당함을 확인하였다. This study investigated the influence of air staging on combustion and NOx emission in a tangential-firing boiler at a 560 MWe capacity. For air staging, the stoichiometric ratio (SR) for the burner zone was varied from 0.995 to 0.94 while the overall value was fixed at 1.2. The temperature and heat flux in the burner zone and upper furnace corresponded to the distribution of SR, while the total boiler efficiency remained similar. The NOx emission at the furnace exit was reduced by up to 20% when the SR in the burner zone decreased to 0.94. However, the amount of unburned carbon and slagging propensity was not noticeably influenced by the changes in the SR of the burner zone. Therefore, it was favorable to lower the SR of the burner zone for reduction of NOx emission.
강기섭(Kieseop Kang),이용운(Yongwoon Lee),박진제(Jinjae Park),류창국(Changkook Ryu),양원(Won Yang) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46
Biomass is well known for organic resources photosynthesized by carbon dioxide water in the air and thus it can be widely used in the form of energy and production for various kinds of materials. Through pyrolysis, biomass can be transformed into solid(biochar), liquid(bio-oil), and combustible gas on the different condition of temperature and heating rate. That’s why biomass can be practically used to preprocess and produce a variety of elements. This work is to analyze the characteristics of slow pyrolysis of three different kinds of biomass extracted from Indonesia. They showed similar moisture content and combinations of combustible matters and had quite a large discrepancy in the ash among them like 2.1 & of Bagasse, 91% of PKS, and 20.9% of Paddy Straw, respectively. yield of biochar, solid form of the biomass, steadily decreased when the temperature went up and that of bio-oil the highest at the temperature of 500 degrees Celsius. At the same temperature range, PKS bio-oil showed 51.4 % of yield and Bagasse had 55.1% while it turned out that Paddy straw showed the lowest yield of 37.2%. The apparent density was also measured to figure out the density of each product from the pyrolysis experiments at the temperature of 500 degrees Celsius. The result was like these; the density of biochar was 0.17, the lowest, and that of Tree stem was 1.3 when mixed by an equal amount of biochar and bio-oil.
미분탄 바이오매스 혼소 시 연료 단계 연소를 통한 NOx 저감 특성 연구
강기섭(Kieseop Kang),오준호(Junho Oh),양주향(Joohyang Yang),양원(Won Yang),류창국(Changkook Ryu) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
This study investigates the co-combustion characteristics of biomass in a coal fired tangential firing boiler in a 560 MWe capacity power plant. The detailed flow, heat and reaction characteristics for different cofiring methods were evaluated using computational fluid dynamics adopting sub-models for combustion of solid fuels. The cofiring of biomass having a lower calorific value led to overall decrease in the gas temperatures of the burner zone and corresponding decrease in NOx emission. The use of dedicated burners for biomass had different temperature and NOx concentrations, compared to the cases for direct cofiring of coal/biomass blends. The results suggest that biomass cofiring method can be optimized for reduced NOx emission.
500 MWe급 석탄화력 보일러 내 바이오매스 혼소 특성에 대한 수치적 연구
오준호(Junho Oh),양주향(Juhyang Yang),강기섭(Kieseop Kang),류창국(Changkook Ryu) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
This study investigates the co-combustion characteristics of biomass in a coal fired tangential firing boiler in a 500 MWe capacity power plant. The detailed flow, heat and reaction characteristics for different cofiring methods were evaluated using computational fluid dynamics adopting advanced sub-models for combustion of solid fuels. The cofiring of biomass having a lower calorific value led to overall decrease in the gas temperatures of the burner zone and corresponding decrease in NOx emission. The use of dedicated cases for direct cofiring of coal/biomass blends. The results suggest that biomass cofiring method can be optimized for reduced NOx emission.
채태영(Taeyoung Chae),이재욱(Jaewook Lee),조가람(Garam Jo),류창국(Changkook Ryu),강기섭(Kieseop Kang),양원(Won Yang) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
An experimental study was performed in a 60 kWth down-fired furnace to investigate characteristics of syngas reburning in combustion systems which use LNG and coal as a main fuel, reburn fuels used were CH4, CO, and H2. Measurements of local mean 02, CO, CO2, and NOx concentrations, and gas temperatures have been performed in the furnace for various conditions: species of the reburn fuels and stoichiometic ratio in the reburn zone. The reburning ratio tested for gas fuels was ranged from 5% to 20%, and 10% coal based on. In the result, maximum NOx reduction was 52.4% for LNG and 33.4% for coal. CH4 was observed to have the most significant effect to reduce NOx for both LNG and coal case. Additionally, NOx was observed to be more reduced for lower stoichimetric ratio in the reburn zone; i.e. higher reburn ratio.