• 한국수소및신에너지학회논문집
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• 제31권4호
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• pp.372-379
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• 2020

Ammonia-hydrogen dual-fuel engine is a way to reduce greenhouse gas emission because ammonia and hydrogen are carbon-free fuels. In ammonia-hydrogen dual-fuel engine, hydrogen is supplied to improve the combustion characteristic of ammonia. In this study, an ammonia reformer was developed to supply hydrogen for 10 kW class ammonia-hydrogen dual-fuel engine. Thermodynamic characteristic and catalyst were investigated for ammonia reforming. Heat transfer was important for high ammonia conversion of ammonia reformer. 99% of ammonia conversion was obtained when 10 LPM of ammonia and 610℃ of hot gas were supplied to the ammonia reformer.

• KSBB Journal
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• 제19권3호
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• pp.231-235
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• 2004

본 논문은 식물정유를 이용해 유해가스를 처리하는 경우에 식물정유의 주요구성성분을 파악하고 이를 통해 처리효율을 규명하는데 연구하였다. 또한 식물정유와 암모니아 가스에 의한 암모니아 제거반응 메카니즘을 규명하였으며 그 결과는 아래와 같다. 1) 암모니아 가스는 중화반응에 의해 처리되는 경우에 식물정유의 화학구조에서 알코올기, 알데히드기 그리고 에스터기가 관여한다는 것을 밝혀냈다. 실험결과 앞서 언급한 화학작용기가 포함되어 있는 경우에 암모니아 가스와 중화반응으로 염을 형성하여 유해가스 제거과정을 갖는다 2) 암모니아가스를 제거하는 중화반응의 경우에 온도와 pH에 따라 처리효율을 크게 달라졌으며 온도는 높은 온도보다는 적정 온도에서 제거효율이 거의 98%이상 제거되었으며 적정 pH는 pH가 중성인 경우에 최고의 처리효율이 얻어졌다. 3) 암모니아 가스의 처리효율은 식물정유을 통해 20분 이내에 암모니아 가스 처리 효율이 98% 이상 처리되는 것으로 나타났다.

• Tuberculosis and Respiratory Diseases
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• 제38권1호
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• pp.70-73
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• 1991

We have experienced a case of lung injury caused by accidental inhalation of ammonia gas in a 34 year-old-man. By the explosion of ammonia tank in a refrigerator boat he inhaled ammonia gas. Several minutes later, he suffered from severe dyspnea and visual loss. On arrival at emergency room, analysis of arterial blood gas revealed severe hypoxemia and his chest film showed bilateral pulmonary infiltrates. Under the impression of adult respiratory distress syndrome, mechanical ventilator was applied to the patient. After recovery from ARDS and tracheal edema, he complained of some hemoptysis and productive sputum during the admission. So we checked bronchoscopy and bronchograpy which showed tracheal bullae just above carina and tubular bronchiectatic change in the right lower lobe. We report a case of lung injuries-ARDS, tracheal bullae, and bronchiectasis-caused by inhalation of ammonia gas with the review of the relevant literatures.

• 한국산업융합학회 논문집
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• 제26권6_2호
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• pp.1171-1181
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• 2023

In this study, a sweep gas - vacuum hybrid type membrane degassing process was proposed for ammonia wastewater treatment. In addition, the ammonia selective recovery of the hybrid type membrane degassing process was also investigated. As a result, the hybrid type membrane degassing process showed better degassing performance (54.9 mg NH₃/m²min for 360 min) than the sweep gas type (32.3 mg NH₃/m²min) or vacuum type (22 mg NH₃/m²min). Additionally, the hybrid type membrane degassing process showed an excellent ammonia selectivity (103 times compared to Na+ Na⁺, 133 times compared to Ca²⁺). The ammonia selectivity was appeared to be due to the conversion characteristics of ammonium ion / dissolved ammonia depending on pH. The results in this study are expected to be used in the development of ammonia wastewater treatment and ammonia recovery in the future.

• 전기학회논문지
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• 제62권6호
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• pp.782-785
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• 2013

Multi-walled carbon nanotubes were synthesized on Ni catalyst using thermal chemical vapor deposition. By introducing ammonia gas during the CNT synthesis process, clean and vertically aligned CNTs without impurities could be prepared. As the ammonia gas increased a partial pressure of hydrogen in the mixed gas during the CNT synthesis process, we could control the CNT synthesis rate appropriately. As the ammonia gas has an etching ability, amorphous carbon species covering the catalyst particles were effectively removed. Therefore catalyst particles could maintain their catalytic state actively during the synthesis process. Finally, we could obtain clean and vertically aligned CNTs by introducing $NH_3$ gas during the CNT synthesis process.

• 한국자동차공학회논문집
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• 제23권2호
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• pp.199-207
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• 2015

Solid materials of ammonia sources with SCR have been considered for the application of lean NOx reduction in automobile industry, to overcome complex problems of liquid urea based SCR. These solid materials produce ammonia gas directly with proper heating and can be packaged by compact size, because of high volumetric ammonia density. Among ammonium salts and metal ammine chlorides, calcium ammine chloride was focused on this paper due to low decomposition temperature. In order to make calcium ammine chloride in lab-scale, simple reactor and glove box was designed and built with ammonium gas tank, regulator, and sensors. Basic test conditions of charging ammonia gas to anhydrous calcium chloride are chosen from equilibrium vapor pressure by Van't Hoff plot based on thermodynamic properties of materials. Synthetic method of calcium ammine chloride were studied for different durations, temperatures, and pressures with proper ammonia gas charged, as a respect of ammonia gas adsorption rate(%) from simple weight calculations which were confirmed by IC. Also, lab-made calcium ammine chloride were analyzed by TGA and DSC to clarify decomposition step in the equations of chemical reaction. To understand material characteristics for lab-made calcium ammine chloride, DA, XRD and FT-IR analysis were performed with published data of literature. From analytical results, water content in lab-made calcium ammine chloride can be discovered and new test procedures of water removal were proposed.

• 플랜트 저널
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• 제15권3호
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• pp.23-28
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• 2019

본 연구에서는 580 MW급 세종복합발전소의 선택적 촉매환원방식 탈질설비 1호기를 대상으로 강화된 대기환경보전법 및 환경평가협의 질소산화물 허용배출기준을 준수하는 암모니아 소모량을 찾고자 가스터빈 출력별 암모니아 투입량을 조절하며 측정하였다. 측정을 위해 가스터빈 출력은 50, 99, 149 그리고 198 MW로 변동시키고 각 출력단계별 연소가스 및 암모니아 공급조건을 고정한 상태에서 탈질설비 내 암모니아 소모량을 조절하였다. 질소산화물 배출기준을 10 ppm에서 8 ppm으로 변경하였을 때 출력대별 암모니아 소모량은 각각 78, 93, 105 그리고 133 kg/h에서 89, 113, 132 그리고 176 kg/h로 증가 되었다. 암모니아 소모량 증가율은 질소산화물 배출기준 10 ppm 대비 출력대 별 각각 14, 22, 26 그리고 32%로 출력이 증가할 수 록 증가율도 늘어남을 알 수 있었다.

• 상하수도학회지
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• 제26권5호
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• pp.649-658
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• 2012

In this study, the influencing factors for efficient anaerobic digestion of high strength ammonia-nitrogen wastewater removal were investigated by testing biochemical methane potential test. In the influencing factors, the trace metals which could increase activity of anaerobic microorganisms, microbial concentration and types were evaluated. In the results, trace metals supplementation showed gas production amount higher than those without addition of trace metals. Among the tested trace metals, B, Ni, and Se were preferable to gas production. In the result of gas production according to the microbial concentration, the amount of gas production was proportional to the microbial concentration. In addition, the shortest lag time and the fastest gas production rate were achieved when the highest microbial concentration was tested. granule-type microorganism produced more gas than suspended-type microorganism. In conclusion, the efficient anaerobic digestion for high strength ammonia-nitrogen wastewater removal could be achieved by applying necessary trace metals injection and high concentration granule type microorganism.

• 한국가스학회지
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• 제20권3호
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• pp.38-45
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• 2016

이 논문에서 암모니아 가스의 실내 누출 및 확산 현상을 FLACS 소프트웨어를 이용하여 시뮬레이션한 결과, 암모니아 가스가 실내에서 폭발 위험분위기를 쉽게 형성함을 확인하였다. 따라서 암모니아 가스를 냉매가스로 사용하는 고압가스 냉동제조시설의 냉동실은 환기장치를 갖추거나 가스누출검지경보장치를 설치하여야 한다. 그러나 냉동시설의 특성상 이들 설비를 설치할 수 없기 때문에 재발방지대책으로 암모니아 가스설비의 전기설비는 방폭구조로 설치하고 고압가스 냉동제조시설에서 가스누출 등의 이상사태가 발생하는 경우에 사업장 안의 모든 종사자가 신속히 대피할 수 있도록 통신시설을 설치할 필요가 있다.

• 한국축산시설환경학회지
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• 제12권1호
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• pp.7-12
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• 2006

본 연구에서는 육성 비육돈 슬러리를 이용하여 슬러리의 환경조건에 따라 슬러리로 부터의 암모니아 발생 특성을 분석코자 하였다. 슬러리의 온도와 pH를 조절하여 슬러리로부터 발생하는 암모니아 농도를 측정 분석한 결과 슬러리의 온도가 높을수록 슬러리로 부터 발생하는 암모니아 농도는 급격히 증가하는 것으로 나타났고, 슬러리의 pH를 5, 6, 7, 8의 4수준으로 조절하여 각각의 온도에 따라 발생하는 암모니아 농도를 측정한 결과 pH 5, 6에서는 암모니아 가스가 검출되지 않았으나 pH 7, 8에서는 많은 양의 암모니아 가스가 검출되었고 양돈 슬러리의 pH가 높을수록 발생하는 암모니아 가스가 많이 발생하는 것으로 분석되었다. 본 연구결과 슬러리의 온도를 낮추어 주거나 슬러리의 pH를 낮춤으로써 슬러리로부터 발생하는 악취가스를 크게 줄일 수 있을 것으로 판단되었다.