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Flame characteristics of hydrogen-enriched methane-air premixed swirling flames
Kim, H.S.,Arghode, V.K.,Gupta, A.K. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.2
The effect of hydrogen addition in methane-air premixed flames has been examined from a swirl-stabilized combustor under unconfined flame conditions. Different swirlers have been examined to investigate the effect of swirl intensity on enriching methane-air flame with hydrogen in a laboratory-scale premixed combustor operated at 5.81kW. The hydrogen-enriched methane fuel and air were mixed in a pre-mixer and introduced into the burner having swirlers of different swirl vane angles that provided different swirl strengths. The combustion characteristics of hydrogen-enriched methane-air flames at fixed thermal load but different swirl strengths were examined using particle image velocimetry (PIV), OH chemiluminescence, gas analyzers, and micro-thermocouple diagnostics to provide information on flow field, combustion generated OH radical and gas species concentration, and temperature distribution, respectively. The results show that higher combustibility of hydrogen assists to promote faster chemical reaction, raises temperature in the reaction zone and reduces the recirculation flow in the reaction zone. The upstream of flame region is more dependent on the swirl strength than the effect of hydrogen addition to methane fuel. At lower swirl strength condition the NO concentration in the reaction zone reduces with increase in hydrogen content in the fuel mixture. Higher combustibility of hydrogen accelerates the flow to reduce the residence time of hot product gases in the high temperature reaction zone. At higher swirl strength the NO concentration increases with increase in hydrogen content in the fuel mixture. The effect of dynamic expansion of the gases with hydrogen addition appears to be more dominant to reduce the recirculation of relatively cooler gases into the reaction zone. NO concentration also increases with decrease in the swirl strength.
Combustion Characteristics of Hydrogen-Enriched Propane in a Dump Combustor with a Bluff-Body
Daehee Kim(김대희),Junggoo Hong(홍정구),Hyundong Shin(신현동),Sangmin Choi(최상민) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Combustion characteristics of a partially premixed flame in a dump combustor were studied to determine the effects of hydrogen enrichment in propane. A bluff-body was used for flame stabilization. Fuel mixtures of hydrogen mole fraction ranging from 0.1 to 0.5 were burnt at ambient pressure within a quartz chamber. Tests were carried out keeping the total reactants flow rate by adjusting the fuel and air flow rates. Fluctuations of pressure were measured by a piezoelectric pressure sensor. Instantaneous flame structure and OH chemiluminescence images were caprured by a High-speed Intensified Charged Coupled Device (HICCD) camera and Intensified Charged Coupled Device (ICCD) camera. It is shown that hydrogen enrichment in propane induces increase of the frequency and amplitude of pressure fluctuations. Flame existence region seems to be very alike, but instantaneous flame behavior for one cycle showed a different moving tendency according to hydrogen enrichment. Also, location of primary reaction zone was changed from the inner recirculation zone to the turbulent shear layer. The reason is that hydrogen-enriched flame has more fast chemical reaction rate compared to the propane flame so chemical aspects take precedence over flow aspects in the hydrogen-enriched flame.
Hydrogen addition effects in a confined swirl-stabilized methane-air flame
Kim, H.S.,Arghode, V.K.,Linck, M.B.,Gupta, A.K. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.2
The effect of hydrogen addition in methane-air premixed flames has been examined from a swirl-stabilized combustor under confined conditions. The effect of hydrogen addition in methane-air flame has been examined over a range of conditions using a laboratory-scale premixed combustor operated at 5.81kW. Different swirlers have been investigated to identify the role of swirl strength to the incoming mixture. The flame stability was examined for the effect of amount of hydrogen addition, combustion air flow rates and swirl strengths. This was carried out by comparing adiabatic flame temperatures at the lean flame limit. The combustion characteristics of hydrogen-enriched methane flames at constant heat load but different swirl strengths have been examined using particle image velocimetry (PIV), micro-thermocouples and OH chemiluminescence diagnostics that provided information on velocity, thermal field, and combustion generated OH species concentration in the flame, respectively. Gas analyzer was used to obtain NO<SUB>x</SUB> and CO concentration at the combustor exit. The results show that the lean stability limit is extended by hydrogen addition. The stability limit can reduce at higher swirl intensity to the fuel-air mixture operating at lower adiabatic flame temperatures. The addition of hydrogen increases the NO<SUB>x</SUB> emission; however, this effect can be reduced by increasing either the excess air or swirl intensity. The emissions of NO<SUB>x</SUB> and CO from the premixed flame were also compared with a diffusion flame type combustor. The NO<SUB>x</SUB> emissions of hydrogen-enriched methane premixed flame were found to be lower than the corresponding diffusion flame under same operating conditions for the fuel-lean case.
수소 혼합에 따른 덤프 연소기 연소 특성에 관한 실험적 연구
김대희(Dae Hee Kim),홍정구(Jung Goo Hong),신현동(Hyun Dong Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The combustion characteristics of a partially premixed flame in a dump combustor were studied to determine the effects of hydrogen enrichment in propane. Bluff-body was used for flame stabilization. Fuel mixtures containing a hydrogen mole fraction ranging from 0.1 to 0.5 were burnt at ambient pressure within a quartz chamber. Tests were carried out keeping the total reactant flow rate by adjusting the fuel and air flow rates. The fluctuations of pressure were measured by piezoelectric pressure sensor. The instantaneous flame structure and OH chemiluminescence images were described by High-speed Intensified Charged Coupled Device (HICCD) camera and Intensified Charged Coupled Device (ICCD) camera. The present results show that hydrogen enrichment in fuel changed the location of primary reaction zone from inner recirculation zone to turbulent shear layer and pressure signal. The reason is that chemical aspects take precedence over flow aspects in the hydrogen-enriched flame.
수소혼소용 가스터빈의 요소기술 및 국내외 기술개발 동향
주용진,김미영,박정극,박세익,신주곤 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.4
Recently, renewable power is rapidly increasing globally due to extensive effort to mitigate climate change and conventional power generation industry faces new challenges. The gas turbine technology has potentials to expand its role in future power generation based on the intrinsic characteristics such as fuel diversity and fast load following ability. Hydrogen is one of the most promising fuel in terms of reducing emissions and storing variable renewable energy and replacing hydrocarbon fuel with hydrogen has become very popular. Therefore, this paper presents the core technologies to combust hydrogen added fuel efficiently in gas turbines and the analysis of domestic and international R&D trends.