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석탄 CFBC보일러의 환원제 주입위치에 따른 SNCR 효율특성 연구
정복화 ( Bok-hoa Jeong ),송장헌 ( Jang-heon Song ),정진도 ( Jin-do Chung ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회지 Vol.37 No.2
SNCR (Selective Non Catalytic Reduction) technology is a post-combustion control technology for reducing NOx that injects ammonia reductant into the appropriate position of a boiler furnace. In this study, coal CFBC (Circulating Fludized Bed Combustion) (200 MW), was conducted to obtain the optimum desorption efficiency according to the location of the reducer injection within the temperature range from 850°C to 1,150°C. The performance test at the entrance to the cyclone inlet showed that the average NOx was 50.80 ppm before and 36.93 ppm after reducer injection, respectively. Thus, the average NOx removal efficiency is 27.30%. These results do not satisfy the SNCR performance condition of 30 ppm nor signify a denitrogenation efficiency of greater than 50%. In the cyclone outlet, the NOx removal efficiency was measured at an average of 49.16 ppm before the reducer was injected at an average rate of 21.15 ppm, corresponding to an average reduction of 56.97% after the reducer was injected, which does not exceed the SNCR performance satisfying condition (30 ppm emission concentration of NOx) and corresponds to a desorption rate of greater than 50%. The principal reason for the low denitrogenation efficiency found at the cyclone inlet is that the delayed combustion of the anthracite fuel caused continuous combustion at the seal pot of the cyclone bottom, which is potentially affected the desorption efficiency due to decomposition at high temperature. Therefore, it is desirable to install the optimal reductant for applying SNCR in circulating fluidized bed boilers that use less volatile and combustible anthracite in the cyclone outlet, where delayed combustion does not occur.
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식품폐수처리시설의 설비효율 개선에 따른 온실가스 배출량 평가
안상형(Sang-Hyung An),송장헌(Jang-Heon Song),김산(San Kim),정진도(Jin-Do Chung) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.2
식품 폐수 처리 설비중 폐수처리장 폭기조 송풍 설비 개선을 통한 수질개선 효과 및 전기사용량 변화에 따른 온실가스 발생량을 평가 하였으며, 식품 폐수처리장에서 발생되는 슬러지를 탈수, 보관, 이송하는 설비의 효율적인 개선을 통한 전기사용량 개선전과 개선후 변화에 따른 온실가스 발생량도 함께 평가하였다. 폐수처리장 설비 개선에 따른 온실가스 배출량 평가는 폐수처리 공정으로 부터의 직접배출과 전력사용으로부터의 간접배출량으로 구분 된다. 폐수처리장 수질 개선 효과는 BOD 제거율이 63.3%, COD 제거율 42.0%, SS 제거율 71.0%, T-N제거율이 39.6%로 나타났으며, 폐수처리에 의한 온실가스 직접배출량(Scope 1)과 전력소비량 변화에 대한 온실가스 간접배출량(Scope 2)을 적용하여 온실가스 배출량을 산정한 결과 설비 개선전 3,668.8tCO2eq./yr 에서 설비 개선후 3,392.8tCO2eq./yr 으로 감소 하여 총 276.0tCO2eq./yr (8.0%)의 온실가스 감축 효과가 있는 것으로 평가 되었다. 이상의 결과는 배출원의 수질 개선 효과로 인한 것이 아니라 전기사용량 감소로 인해 온실가스 배출량이 감소하였기 때문이다. In the food wastewater treatment facilities, the water quality improvement effect and the greenhouse gas emission amount followed by the change in electricity usage through a change of the aeration tank ventilation system were evaluated. also, the amount of greenhouse gas emission followed by the change in electricity usage through the change of the sludge dewatering, storage, transporting method was also evaluated. The total GHG emission from food wastewater treatment facility improvement were divided into direct emissions from the treatment processes and indirect ones from electricity usage. The water quality improvement effect of wastewater treatment plant was found to be 63.3% for BOD removal rate, 42.0% for COD removal rate, 71.0% for SS removal rate and 39.6% for T-N removal rate. and according to the results of calculating output by applying both direct emissions of greenhouse gas (Scope 1) and the indirect emission (Scope 2) of greenhouse gas followed by changes in power consumption. It was estimated that there was a total of 276.0tCO2eq./yr(7.5%) greenhouse gas reduction effect from 3,668.8tCO2eq./yr before improvement to 3,392.8tCO2eq./yr after improvement. In this result is not due to the effects of water quality improvement of emission source, but because the reduction in electricity use has reduced the amount of greenhouse gas emissions
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음식물류 폐수 소각처리에 따른 질소산화물 저감 및 소각설비의 안정성 평가에 관한 연구
황승민(Seung Min Hwang),정진도(Jin Do Chung),송장헌(Jang Heon Song) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.10
음식물류 폐수를 생활 폐기물 소각로에 직접 분사하여 소각처리 하는 방안에 대하여 검토하였다. 소각설비는 연속 스토카식 실증플랜트를 이용하였다. 그 결과 암모니아성 질소(NH₃-N)가 다량 함유된 음식물류 폐수를 분사·소각함으로써 질소산화물(NOx) 농도저감과 동시에 질소산화물(NOx) 저감을 위해 선택적 비촉매 환원장치(selective non-catalytic reduction; SNCR)에서 사용되는 암모니아(NH₃)의 사용량을 절감하는 효과를 가져왔다. 또한, 음식물류 폐수를 분사하여 2차 연소실 출구온도를 적정온도인 870~950℃로 유지하여 소각량을 최대화하는 한편 폐열회수 보일러의 수관외벽 막힘현상 개선을 통한 로의 안정성 확보 및 연속운영기간의 연장을 실현하였다. 질소산화물(NOx), 황산화물(SOx) 및 다이옥신 등 대기오염물질 26개 항목에 대하여 측정을 실시한 결과 모두 배출허용 기준치 이하의 값을 나타내었다. We examine the processing method of the food wastewater to direct spray at living waste incinerator. The demoscale stoker system is used as a incineration facility. The results show that it brings effect on the reduction of nitrogen oxide (NOx) concentration as well as the ammonia (NH₃) amount in SNCR (selective non-catalytic reduction) by the incineration of food wastewater which is containing a plentiful ammoniac nitrogen (NH₃-N). Furthermore, the stability of incineration facility and the extension of operation period is actualized as a improvement of clogging phenomenon on outer wall of water pipe as the 870~950 maintain of exit temperature in a second combustor by spray of the food wastewater. The 26 items of air pollution matter of nitrogen oxide (NOx), sulfur oxide (SOx) and dioxin etc. are measured. The results show that it is under the value of allowable exhaust standard.
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