Bio-SRF 연료화 공정에서 발생한 폐열회수 및 활용에 의한 에너지절감에 관한 연구

한단비,백영순,조욱상,고동현,염규인,박성규,황병석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Bio-SRF(Bio Solid Reuse Fuel)인 음식물폐기물을 저온에서 탄화하는 방법이 활발히 연구가 되고 있다. 200~250°C, 20~25kg/㎠ 압력 하에서 산소가 적은 밀폐한 반응기에서 열수가압탄화(HTC; Hydrothermal carbonization) 반응하여 슬러지는 기체, 액체, 고체로 상변환되면서 탄화되어 단위 발열량이 증대될 뿐 아니라 탈수능력(De-waterbility)이 향상이 된다. 열수가압탄화 반응에 의해 생산된 고체는 함수율이 약 30%를 지닌 Bio-coal이 되며, 또한 탈수와 건조공정을 거치면서 10% 이하의 함수량을 가진 고형연료(Bio-SRF)가 생산된다. 이 때 발생되는 다량의 폐열 회수와 동시에 유증기의 응축/냉각을 통하여 미세먼지 및 수분입자를 제거하는 고효율 열교환기가 필요하다. 본 연구에 사용되는 열교환기는 기하학적 수직 충돌판 형상을 이용한 간접 접촉식 열교환기로서 배가스의 온도를 낮추고, 폐열을 회수하여 재활용에 의한 에너지 절감 효과를 case별 분석하여 기존 공정과의 비교한 결과를 얻을 수 있었다.

LNG 냉열을 이용한 냉장⋅냉동 창고 모사에 관한 연구

한단비,김윤지,염규인,신재린,백영순 한국수소및신에너지학회 2017 한국수소 및 신에너지학회논문집 Vol.28 No.4

When Liquified Natural Gas (LNG) is vaporized into NG for industrial and household usage, tremendous cold energy was transferred from LNG to seawater during phase-changing process. This heat exchanger loop is not only a waste of huge cold energy, but will cause thermal pollution to the coastal fishery area also when cold water was re-injected into the sea. In this study, an innovation design has been performed to reclaim the cold energy for -35 to 62℃ refrigerated warehouse. Conventionally, this was done by installing mechanical refrigeration systems, necessitating tremendous electrical power to drive temperature. A closed loop LNG heat exchangers in series was designed to replace the mechanical or vapor-compression refrigeration cycle by process simulator. The process simulation software of PRO II with provision has been used to simulate this process for various conditions, what to effect on cold energy and used energy for re-liquefaction and evaporation process. In addition, through analysis the effect of the change of LNG supply pressure on sensible and latent heat, optimum operational conditions was suggested for LNG cold energy warehouse.

영유아기 아버지의 직장 내 가족친화제도 이용이 초기 청소년기 집행기능에 미치는 영향 : 아동기 부모 공동양육 수행의 매개효과

한단비,최지은,김현경 육아정책연구소 2023 육아정책연구 Vol.17 No.1

본 연구는 한국아동패널을 이용하여 자녀의 영유아기 아버지의 직장 내 가족친화제도 이용이 자녀의 초기 청소년기 집행기능에 종단적으로 미치는 직접적인 영향과, 아동기 동안 부모 공동양육의 수행(아버지의 양육분담률, 가족 유연성)을 증진시킴으로써 미치는 간접적 영향에 대한 경로분석을 실시하였다. 연구결과, 영유아기에 아버지의 직장 내 가족친화제도 이용은 아동기 아버지의 양육분담률을 높이고 가족 유연성을 증진시켰으며, 가족 유연성 증진을 통해 초기 청소년기 자녀의 집행기능 향상에 미치는 매개효과도 유의하였다. 본 연구는 아버지의 직장 내 가족친화제도 이용이 가족에 미치는 실증적 효과와 그 기제를 규명하였다는데 의의가 있으며, 이는 현존하는 제도를 아버지들이 더욱 적극적으로 활용할 필요하다는 것을 시사한다. 이를 바탕으로 본 연구는 아버지의 가족친화제도 이용을 증진시키기 위한 구체적 방안을 제시하였다 This study provided empirical evidence on the effectiveness of family—friendly policies(FFPs) by investigating whether fathers’ use of FFPs, such as fathers’ division of parental involvement and family flexibility, had a longitudinal effect on co-parenting and children’s executive functions. Data from parents and children of 763 families from the 8th, 9th, 11th, and 13th Panel Study on Korean Children were analyzed. Findings showed that fathers’ use of FFPs during their children’s preschool years increased both indicators of co-parenting during their children’s childhood. In addition, family flexibility in childhood served as a mediator to the longitudinal effects of fathers’ using of FFPs on children’s executive function in early adolescence.

열수가압탄화 공정에 의한 음식물폐기물로부터의 Bio Solid Reuse Fuel (Bio-SRF) 연료제조에 관한 실증연구

한단비,염규인,박성규,조욱상,백영순 한국수소및신에너지학회 2017 한국수소 및 신에너지학회논문집 Vol.28 No.4

Hydrothermal carbonization (HTC) is an effective and environment friendly technique; it possesses extensive potential towards producing high-energy density solid fuels. it is a carbonization method of thermochemical process at a relatively low temperature (180-250℃). It is reacted by water containing raw material. However, the production and quality of solid fuels from HTC depends upon several parameters; temperature, residence time, and pressure. This study investigates the influence of operating parameters on solid fuel production during HTC. Especially, when food waste was reacted for 2 hours, 4 hours, and 8 hours at 200℃ and 2.0-2.5 MPa, Data including heating value, proximate analysis and water content was consequently collected and analyzed. It was found that reaction temperature, residence time are the primary factors that influence the HTC process.

양방향수전해 기반 수소제조용 초고온스팀 생산시스템의 엑서지 분석

한단비,박성룡,조종표,백영순,HAN, DANBEE,PARK, SENGRYONG,CHO, CHONGPYO,BAEK, YOUNGSOON 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.3

Hydrogen can be produced by reforming reaction of natural gas (NG) and biogas, or by water electrolysis. In this study, hydrogen production through water-electrolysis needs superheated steam above $700^{\circ}C$ for high efficiency. The production method of hydrogen like this was recommended for the 4-type processes for superheated steam ($700^{\circ}C$, 3 atm) by Bio-SRF combustion furnace. The 4-type processes to produce superheated steam at $700^{\circ}C$ from the heat source of SRF combustion furnace was simulated using PRO II. The optimum process was selected through exergy analysis. The difference of process 1 and 2 is to the order of depressure and heating process to change $180^{\circ}C$ and 7 atm to $700^{\circ}C$ and 3 atm. Process 3 and 4 is to utilize 25% of steam to generate superheated steam and remaining to use for the power generation by steam generator.

수소액화공정에서 LNG 냉열 적용에 관한 시뮬레이션 연구

한단비,변현승,백영순 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.1

As hydrogen utilization becomes more active recently, a large amount of hydrogen should be supplied safely. Among the three supply methods, liquefied hydrogen, which is an optimal method of storage and transportation convenience and high safety, has a low temperature of -253℃, which is complicated by the liquefaction process and consumes a lot of electricity, resulting in high operating costs. In order to reduce the electrical energy required for liquefaction and to raise the efficiency, hydrogen is cooled by using a mixed refrigerant in a precooling step. The electricity required for the precooling process of the mixed refrigerant can be reduced by using the cold energy of LNG. Actually, LNG cold energy is used in refrigeration warehouse and air liquefaction separation process, and a lot of power reduction is achieved. The purpose of this study is to replace the electric power by using LNG cold energy instead of the electric air-cooler to lower the temperature of the hydrogen and refrigerant that are increased due to the compression in the hydrogen liquefaction process. The required energy was obtained by simulating mixed refrigerant (MR) hydrogen liquefaction system with LNG cold heat and electric system. In addition, the power replacement rate of the electric process were obtained with the pressure, the temperature of LNG, the rate of latent heat utilization, and the hydrogen liquefaction capacity, Therefore, optimization of the hydrogen liquefaction system using LNG cold energy was carried out.

13“ 비대칭 DPF 내 형상에 따른 배압 및 유동균일도 영향에 관한 전산해석연구

한단비,변현승,백영순 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.6

Recently, as the fine dust is increased and the emission regulations of diesel engines are strengthened, interest in diesel soot filtration devices is rapidly increased. In particular, there is a demand for technology development for higher efficiency of diesel exhaust gas after-treatment devices. As part of this, many studies conducted to increase the exhaust gas treatment efficiency by improving the flow uniformity of the exhaust gas in the DPF and reducing the pressure drop between the inlet and outlet of disel particle filter (DPF). In this study, computational fluid dynamics (CFD) simulation was performed when exhaust gas flows into the canning reduction device equipped with a 13” asymmetric DPF in order to maintain the flow uniformity in the diesel exhaust system and reduce the pressure. In particular, a study was conducted to find the geometry with the smallest pressure drop and the highest flow uniformity by simulating the DPF I/O ratio, exhaust gas temperature, inlet-outlet pressure and flow uniformity according to the geometry and hole size of distributor.

GSICS 개념을 적용한 MI 수증기 채널에서의 분광반응함수 중심파장 불확실성 평가

한단비,안명환,김도형,이병일,정성래 한국기상학회 2015 한국기상학회 학술대회 논문집 Vol.2015 No.10

LNG 냉열을 이용한 공기액화분리시스템의 시뮬레이션 및 공정 해석

한단비,백영순 한국수소및신에너지학회 2019 한국수소 및 신에너지학회논문집 Vol.30 No.3

The process of separating oxygen and nitrogen from the air is mainly performed by electric liquefaction, which consumes a lot of electricity, resulting in higher operating costs. On the other hand, when used for cold energy of LNG, electric power can be reduced compared to the electric Linde cycle. Currently, LNG cold energy is used in the cold refrigeration warehouse, separation of air-liquefaction, and LNG cold energy generation in Japan. In this study, the system using LNG cold energy and the Linde cycle process system were simulated by PRO/II simulators, respectively, to cool the elevated air temperature from the compressor to about –183°C in the air liquefaction separation process. The required amount of electricity was compared with the latent heat utilization fraction of LNG, the LNG supply pressure, and the LNG cold energy usage. At the air flow rate of 17,600 m3/h, the power source unit of the Linde cycle system was 0.77 kWh/m3, compared with 0.3 kWh/m3.

ADSV와 MDVP 음성 파라미터 간의 상관연구

한단비,주수라,유재연 한국언어치료학회 2019 言語治療硏究 Vol.28 No.4

Purpose: A lack of normative data based on gender of normal- and voice-disordered persons in MDVP and ADSV exists. This study was designed to derive average values for men and women in their 20s through MDVP and ADSV, and to determine whether a statistic difference exists between each parameter and gender and the correlation between MDVP and ADSV measurements. Methods: One hundred subjects (50 males, 50 females) with normal hearing and voice participated in this study. We analyzed prolongation of /a/ and ‘Walk' and ‘Fall' passages voice samples. The ADSV measured CPP, L/H ratio and CSID, and the MDVP measured jitter, shimmer, NHR. Results: In MDVP, jitter and NHR were significantly different between men and women, but shimmer was not significantly different between the two groups. In ADSV, CPP, CSID, and L/H ratio were significantly different between males and females in vowel and connective utterance (Gaeul, Sanchaek) tasks. In addition, there was a strong correlation between CPP, CSID, and L/H ratio between 'Autumn' and 'Walking' paragraphs. There was a strong correlation between CSID-CPP and CSID-L/H ratio in the connection ignition task. Conclusions: The parameters of MDVP and ADSV show differences between men and women. Therefore, it is necessary to establish a normative value according to gender that could be used clinically by estimating measurements between devices based on strong correlation between MDVP and ADSV. 목적 : Multi-Dimensional Voice Program (MDVP)과 Analysis of Dysphonia in Speech and Voice (ADSV)를 사용한 정상인과 음성장애인의 성별에 따른 규준 데이터가 부족한 편이다. 본 연구는 MDVP와 ADSV를 통해 정상 20대 남녀의 음향학적 파라미터 평균값을 알아보고, 파라미터 값의 성별 간 차이와 MDVP와 ADSV 측정치 간의 상관을 알아보고자 하였다. 방법 : 정상청력을 가지고 있고 성대 질환이 없는 20대 성인 남녀 각 50명씩 100명의 대상자들의음성샘플을 분석하였다. 발화 과제는 모음발성과 문장읽기를 실시하였다. ADSV에서는 Cepstral Peak Prominence (CPP), Cepstral Peak Prominence Fundamental Frequency (CPPF0), Low/High spectral ratio (L/H ratio), Cepstral/spectral index of dysphonia (CSID)를, MDVP에서는 Jitter, Shimmer, NHR, F0를 측정하였다. 결과 : MDVP에서 주파수변동률(Jitter), 소음대배음비(NHR)는 남녀 간에 유의한 차이가 있었으나, 진폭변동률(Shimmer)은 두 집단 간에유의한 차이가 없었다. ADSV에서 모음발성, 읽기 과제에서 CPP, CSID, L/H ratio 모두 남녀 간유의한 차이를 보였다. 또한 두 읽기 과제 간에 CPP, CSID, L/H ratio에서 강한 상관관계가나타났으며, 연결발화 과제의 CSID-CPP, CSID-L/H ratio 간 강한 상관관계가 나타났다. 결론 : MDVP와 ADSV의 파라미터에서 남녀 간의 차이가 나타났다. 따라서 성별에 따른 음질의기준값을 설정할 필요가 있다. 그리고 MDVP와 ADSV 간에 강한 상관이 있다는 점에서 볼 때, 기기 간 측정치를 어느 정도 예측함으로써 임상에서 기기 측정치를 유용하게 사용할 수 있을것이다.