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Pilot급 산소 MILD 연소에 관한 실험 및 수치해석적 연구
차천륜(Chun-Loon Cha),이호연(Ho-Yeon Lee),황상순(Sang-Soon Hwang) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.7
MILD (Moderate and Intense Low-oxygen Dilution) combustion using oxygen as an oxidizer is considered as one of the most promising combustion technologies for high energy efficiency and for reducing nitrogen oxide and carbon dioxide emissions. In order to investigate the effects of nozzle angle and oxygen velocity conditions on the formation of oxygen-MILD combustion, numerical and experimental approaches were performed in this study. The numerical results showed that the recirculation ratio (Kv), which is an important parameter for performing MILD combustion, was increased in the main reaction zone when the nozzle angle was changed from 0 degrees to 15 degrees. Also, it was observed that a low and uniform temperature distribution was achieved at an oxygen velocity of 400 m/s. The perfectly invisible oxy-MILD flame was observed experimentally under the condition of a nozzle angle of 10° and an oxygen velocity of 400 m/s. Moreover, the NOx emission limit was satisfied with NOx regulation of less than 80 ppm.
형상 및 작동조건의 변화가 순산소무화염 형성에 미치는 영향
차천륜(Chun Loon Cha),이필형(Pil Hyong Lee),홍성원(Seong Weon Hong),황상순(Sang Soon Hwang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Flameless combustion using the oxygen as an oxidizer is considered as one of the promising combustion technology for high energy efficiency and reducing nitrogen oxides and carbon dioxide emissions. To investigate the effects of geometry and operating conditions on the formation of oxygen flameless combustion, a numerical approach was performed. The recirculation ratio(Kv) as main parameter for flameless combustion was defined as the ratio of recirculated mass of product gas to the mass of fuel and oxidizer entering the furnace. Results show that the flameless combustion possesses the low temperature region and more uniform temperature distribution. Lower than 20ppm CO emissions under the equivalence ratio of 0.4 was produced under conditions of the oxygen nozzle diameter of 3㎜ and the distance between fuel and oxygen nozzles of 10㎜ or 20㎜.
1㎾급 개질기용 예혼합 Swirl 버너의 화염안정성 분석
차천륜(Chun Loon Cha),홍성원(Seong Weon Hong),조순혜(Soon Hye Jo),이필형(Pil Hyong Lee),박봉일(Bong Il Park),황상순(Sang Soon Hwang),양시원(Si Won Yang) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
Fuel processing systems which convert fuel into rich gas need high temperature environment(600-1000℃). Generally, anode-off gas or mixture of anode-off gas and natural gas is used as input gas of fuel reformer. The purpose of this study is to develop a premixed swirl burner that can be used for 0.5-1.5㎾ fuel cell reformer. Premixed swirl burner experiments using natural gas and mixture of natural gas & anode off gas were carried out respectively to investigate the flame characteristics by heating capacity and equivalence ratio. The results show that the flame length is getting shorter with increasing the hydrogen content and flame stability region is confirmed in the experiment at equivalence ratio. Carbon monoxide emission is under 50ppm between 0.65 and 0.85 of equivalence ratio and NOx emission is below 50ppm in the all range.
Cross flow Micro-mix 방식을 이용한 수소 가스터빈 연소기 연소특성에 대한 수치해석적 연구
차천륜(Chun Loon Cha),황상순(Sang Soon Hwang) 한국연소학회 2019 한국연소학회지 Vol.24 No.3
In response to the tight regulation of CO₂ emissions, studies on gas turbines for aviation based on hydrogen fuel have recently become more important. Especially the Micro-mix combustion method is one of the promising combustion technologies that inherent safety against flash-back and low NOx emission due to a very short residence time of reactants in the flame region. In order to analyze the stability and low NOx emission characteristics of a gas turbine combustion system using hydrogen fuel and micro-mix technology, a series of numerical approach were performed in this study. The results show that, as the supplied fuel flow rate and the diameter of the fuel supply nozzle were increased, a stable hydrogen micro-mix combustion flame was formed.
차천륜(Chun Loon Cha),이호연(Ho Yeon Lee),황상순(Sang Soon Hwang) 한국연소학회 2018 한국연소학회지 Vol.23 No.3
Moderate or Intense Low-oxygen Dilution(MILD) combustion is considered as one of the promising combustion technologies that reduce pollutant emission such as NOx, CO and also improve the thermal efficiency and reduced noise and thermal stress of the combustion system. This MILD combustion is known to be formed under a low oxygen concentration condition by diluting the oxidizer and the fuel through strong recirculation of the combustion product gas in the combustion process. In this work, we studied experimentally on the formation of methane MILD combustion under condition of high dilution by burnt gas generated from a first premixed flame in two stage combustor which consists of first premixed burner and secondary combustor. It is found that the burnt gas velocity and oxygen level of burnt gas have strong effects on the formation of methane MILD combustion.