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세라믹 볼 축열체를 이용한 순산소 축열연소시스템에 대한 실험적 연구
홍성국,노동순,이은경,Hong, Sung Kook,Noh, Dong Soon,Lee, Eun Kyung 한국에너지학회 2013 에너지공학 Vol.22 No.2
An experimental study has been conducted for the design of the regenerative oxy-fuel combustion system with ceramic ball. Various design parameters are considered such as ball size, regenerator weight, and combustion load. Regenerative system with a pair of oxygen burners and regenerators is set up and the temperature of oxygen and exhaust gas passing through ball regenerator is measured. It is shown that the temperature distributions with time are affected by ball diameter and regenerator weight, and the significant temperature change is observed by combustion load. As the ball size decreases and the regenerator weight increases, the regenerating temperature efficiency increases. It is found that the heat recovery ratio is low despites of high regeneration temperature efficiency. 순산소 축열연소시스템에서 세라믹 볼 축열체 적용에 따른 축열/재생 특성에 관한 실험적 연구를 수행하였다. 설계인자인 볼 직경, 축열체 무게, 연소부하 변동에 따른 축열/재생 특성을 살펴보았다. 양방향 순산소 축열연소시스템 장치를 구성하여 축열체를 통과하는 배가스 및 산소의 온도를 측정하였다. 실험결과, 볼 직경과 축열체 무게 변동에 따라 배가스 및 산소 온도분포의 변화가 나타났으며, 연소부하 변동시 상대적으로 큰 온도분포의 변화가 측정되었다. 볼 직경이 작아지고 축열체 무게가 증가될수록 측정된 재생온도효율은 증가되었다. 한편, 높은 재생온도효율에 비해 열 회수율은 낮게 예측되어 열 회수율을 향상시키기 위해 축열구조 설계 최적화가 필요함을 확인하였다.
DTF 내 미분탄의 분산이 연소에 미치는 영향과 이를 고려한 순산소 연소특성 연구
서동명(Dong Myung Seo),이대근(Dae Keun Lee),노동순(Dong-Soon Noh),김용모(Youngmo Kim) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was conducted about the effects of pulverized coal dispersion in DTF on its combustion characteristics. Since the temporal steadiness and spacial uniformity of coal feeding are the prerequisites in DTF experiments and the lack of these conditions can give erroneous results, we tried to make our facilities satisfying them. Coal feeding tests with high resolution balances and visualization of coal particles falling in nonreactive drop tube were conducted and the obtained quantitative and qualitative results confirmed what our designs of feeding devices make reliable dispersion of coal particles in time and space. Based on these results, we inspected the effects of coal dispersion on its combustion characteristics in DTF and it were found that the coal combustion is very sensitive on that. Additionally it was tried to obtain several data on oxygen combustion of coal and high concentration CO₂ over 95% could be easily captured.
일차 산소 직접 분사형 다중 노즐 미분탄 순산소 스월 연소기의 성능시험
이대근(Dae Keun Lee),노동순(Dong-Soon Noh),서동명(Dong Myung Seo),고창복(Chang-Bog Ko),이은경(Eun Kyung Lee),최경빈(Kyong-Bin Choi) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The development of Oxy-PC(pulverized coal) burner and its preliminary test were performed. The design concepts of the burner were the adoptions of primary-oxygen direct-injection without the dilution with the recycled flue gas and through multi-nozzle for fuel-oxidant mixing and stable burning, and of high intensity swirler to coping with the reduction of swirling momentum due to a reduced gas flow rate of Oxy-PC combustion compared with Air-PC case. The exhaust gas analyses were conducted for a variety of experimental conditions of O₂ concentration, swirl number, primary O₂ flow rate and tertiary oxidant flow rate. The representative results are the achievement of high concentration CO₂ over 95% and the reduction of NO<SUB>x</SUB> emission to 48㎎/MJ by the injection of tertiary O₂/CO₂ mixture.
0.1㎿급 동축 연소기를 이용한 미분탄의 산소연소 특성 연구
이대근(Dae Keun Lee),노동순(Dong-Soon Noh),김승곤(Seung Gon Kim),고창복(Chang-Bog Ko),서동명(Dong Myung Seo),최경빈(Kyong-Bin Choi) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Experiments using 0.1㎿-class coaxial combustor were conducted to elucidate the fundamental characteristics of pulverized coal combustion with O₂/CO₂ mixture as oxidizer stream, simulating the Oxy-PC combustion with FGR. For various experimental conditions(coal type, thermal power, now rate and swirl now), measurements of in-furnace temperature and radiative heat flux along the furnace and exhaust gas analysis were conducted. As a result, it was found that coal types and O₂ concentration in supplying oxidant have significant effects on flame temperature. Besides, the radiative heat flux of Oxy-PC case, showing a similar temperature profile with Air-PC case, is 21~61% larger than its counterpart. From the exhaust gas analyses, it is thought that CO₂ concentration higher than 90% in Oxy-PC case can be easily achieved by a well-controlled O₂ amount but the combustor design and the determination of operating conditions are important and necessary to reduce the NOx emission.
TGA/DSC, DTF를 이용한 미분탄의 산소 연소 및 NO<SUB>x</SUB> 배출 특성에 관한 실험적 연구
이대근(Dae Keun Lee),서동명(Dong Myung Seo),노동순(Dong-Soon Noh),고창복(Chang-Bog Ko) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
In a view of capturing CO₂ as a greenhouse gas, an experimental study was conducted on the combustion characteristics of pulverized coal in O₂/CO₂ environment using TGA/DSC and DTF facilities. The effects of gas composition and concentration on the processes of devolatilization and char burning experienced by coal particles in combustion furnace and on the concentration of products such as CO₂, CO and NOx were observed using TGA/DSC and DTF respectively. As results, it were found that the rate of devolitilation is nearly independent on the O₂ concentration if it is over 20% but the char burning rate is a sensitive function of O₂ percent, and the two rates can be controlled by O₂ concentration in order to be similar with those of air combustion case. It was also found that high concentration CO₂ can be captured by oxy-coal combustion and high concentration of CO and low value of NOx are exhausted in that case. Additionally, NO reducing reaction by CO with char as catalyst was observed and a meaningful results were obtained.