• 한국인터넷방송통신학회논문지
• /
• 제23권6호
• /
• pp.81-87
• /
• 2023

수소충전소와 수소전기차 간의 통신 프로토콜인 SAE J2601과 SAE J2799는 수소 충전에 관련된 내용만을 다루고 있다. 본 논문에서는 수소전기차의 수소검출, 전류, 전압을 측정하여, 수소충전소로 WiFi 프로토콜을 변화시켜 가면서 센서 데이터를 전송한다. 수소전기차의 센싱, 제어 및 센서 데이터 전송을 위해, 라즈베리파이를 이용하여 소규모 실험실 모델을 만들었다. 센서 데이터를 수소충전소의 데이터베이스에 저장하였고, 저장된 데이터 분석을 위해 그라파나를 이용하여 대쉬보드를 구성하였다. 수소가 검출되면 수소충전소의 디스펜서 밸브를 잠근다. 그리고 WiFi 프로토콜에 따른 평균 전송 지연을 측정하였다. 전송 지연 측정 결과, 수소충전소와 수소전기차간의 센서 데이터 전송을 위한 WiFi 프로토콜은 IEEE 802.11a가 가장 적합하였다.

• 한국수소및신에너지학회논문집
• /
• 제32권6호
• /
• pp.551-564
• /
• 2021

The use of clean energy based on the hydrogen economy is increasing rapidly due to the greenhouse gas reduction policies and the increase in the need for hydrogen. Currently, South Korea government have been considering a plan to construct hydrogen refueling stations at expressway service area for the purpose of supplying hydrogen vehicles. In the case of a hydrogen refueling stations, a quantitative risk assessment (QRA) must be performed because it includs and uses a high pressurized hydrogen storage tank. In this study, QRA was conducted using societal risk and F-N curve by the consequence assessment (CA) of jet fire and explosion according to the population density, capacity of the high pressurized hydrogen storage tank and frequency assessment (FA) data to the general hydrogen refueling stations systems in expressway service area. In the cases of jet with a leak diameter of 7.16 mm, regardless of expressway service area location, the societal risk was over 1E-04 that was acceptable for as Low As reasonably practicable (ALARP) region (workforce), but unacceptable for ALARP region (public). In the cases of gas explosion, all expressway service area satisfy ALARP region. In the case of the population density is over 0.0727, QRA for constructing the hydrogen refueling stations, must be conducted.

• 한국수소및신에너지학회논문집
• /
• 제30권3호
• /
• pp.251-259
• /
• 2019

The aim of this study is to evaluate the economic feasibility of domestic on-site steam methane reforming (SMR) hydrogen refueling stations. We evaluated the levelized cost of hydrogen (LCOH) for the SMR hydrogen refueling stations, which have production capacities of 100 kg/day (SMR 100), 200 kg/day (SMR 200), and 500 kg/day (SMR 500) utilizing the scale factor. The main results indicated that the LCOH of SMR 100, SMR 200, and SMR 500 were 14,367 won/kg, 11,122 won/kg, and 8,157 won/kg, if the utilizations of hydrogen stations were 70%. These results imply that the production capacity of the domestic SMR hydrogen station should be greater than 500 kg/day to compete with other hydrogen stations when we consider the current sale price of hydrogen at the hydrogen stations.

• 한국가스학회지
• /
• 제25권4호
• /
• pp.43-48
• /
• 2021

본 연구는 가스사고 전문해석 프로그램인 FLACS를 이용하여 진행하였다. 안전성해석 대상인 수소충전소는 압축설비, 저장탱크, 수소 배관 등으로 구성되어있다. 주요 시설 및 구성품의 설계 사양, 수소충전소 주변의 환경 조건 등을 반영한 후 잠재적 위험요인에 대한 안전성해석을 실시하였다. 국내 수소충전소는 2021년 기준 약 70여곳의 충전소가 보급되어있으며, 향후 2040년에는 1200기 도입이 예정되어있다. 수소충전소의 안전한 보급을 위해 잠재적 위험에 의한 발생 가능한 사고를 대비하고자 누출·확산 시나리오를 도출하여 안전성을 검토하고자 한다.

• 한국수소및신에너지학회논문집
• /
• 제35권1호
• /
• pp.75-82
• /
• 2024

In this study, design parameter exploration based on finite element analysis was performed to find the optimal shape of bellows, the key component of compressor-embedded refueling tank for a newly developed hydrogen refueling station capable of high-pressure charging above 900 bar. In the design parametric study, the design variables took into account the bellows shapes such as contour radius and span spacing, and the response factors were set to the maximum stress and the gap in the contact direction. In the shape design of the compressor bellows for hydrogen refueling station considered in this study, it was found that adjusting the contour span is an appropriate design method to improve the compression performance and structural safety. From the selection of optimal design, the maximum stress was reduced to 49% compared to the initial design without exceeding the material yield stress.

• 한국안전학회지
• /
• 제35권6호
• /
• pp.1-8
• /
• 2020

In recent years, hydrogen has received much attention as an alternative energy source to fossil fuels. In order to ensure safety from the increasing number of hydrogen refueling stations, prevention methods have been required. In this regard, this study suggested an approach to reduce the risk of hydrogen refueling station by increasing Safety Integrity Level (SIL) for a Steam Methane Reformer (SMR) in On-Site Hydrogen Refueling Station. The worst scenario in the SMR was selected by HAZOP and the required SIL for the worst scenario was identified by LOPA. To verify the required SIL, the PFDavg.(1/RRF) of Safety Instrumented System (SIS) in SMR was calculated by using realistic failure rate data of SIS. Next, several conditions were tested by varying the sensor redundancy and proof test interval reduction and their effects on risk reduction factor were investigated. Consequently, an improved condition, which were the redundancy of two-out-of-three and the proof test interval of twelve months, achieved the tolerable risk resulting in the magnitude of risk reduction factor ten times greater than that of the baseline condition.

• 한국수소및신에너지학회논문집
• /
• 제30권6호
• /
• pp.513-522
• /
• 2019

It is not easy to refuel quickly and safely with 70 MPa hydrogen. This is because the temperature in the vehicle tank rises sharply due to Joule-Thomson effect, etc. Thus protocols such as SAE J2601 in the United States and JPEC-S 0003 in Japan were established. However, they have the problem of over-complexity and lack of versatility by setting the preconditions for hot and cold cases and introducing a number of look-up tables. This study was conducted with the ultimate goal of developing new protocols based on complete real-time communication. Thermodynamic models were made and programs were developed for hydrogen refueling simulations. Simulation results confirmed that there are five parameters in the influencing factors of the hydrogen refueling protocol.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 춘계학술대회
• /
• pp.565-568
• /
• 2007

The high pressure hydrogen gas refueling system is required for fuel cell vehicle. In this paper, a commercial computational fluid dynamics (CFD) code, FLUENT is adopted to investigate the gas flow characteristics inside the check valve for various refueling and tank pressures. The results showed that the choking phenomena can occur for certain refueling pressures, therefore refueling processes should be divided by multiple stages. And a design method to prevent the seal departure problem which reported in CNG usages is required.

• 한국가스학회지
• /
• 제23권6호
• /
• pp.74-80
• /
• 2019

수소를 고압으로 압축하여 사용하는 수소충전소는 안전 확보를 위해 설비간의 안전거리를 규정하고 있다. 수소 충전소에서 발생하는 사고 중 대부분의 사고는 누출사고이며, 누출 시 점화로 인해 제트화염이 생성된다. 고압의 수소 누출로 인한 가스 확산 및 제트화염의 해석은 안전거리 설정에 가장 중요한 요소이다. 본 연구에서는 고압의 환경에서 운용되는 수소충전소에서 발생할 수 있는 누출사고를 대비한 안전관리 규정 도출을 위하여 누출원 크기별 누출조건을 모사하고 위험거리 등을 파악하여 향후 안전기준 제정 시 참고자료로 활용하고자 한다.

• 한국가스학회지
• /
• 제27권4호
• /
• pp.116-122
• /
• 2023

본 연구는 탄소중립 사회 실현을 위해 추진 중인 국제사회(한국, 미국, 유럽, 일본 등)의 수소경제 동향 분석과 더불어, 국민과 밀접한 핵심 수소 사용시설인 기존 구축·운영 중인 기체수소충전소와 향후 구축 예정인 액화수소충전소의 유형별 차이점을 비교·분석하였다. 또한, 정량적 위험성평가 프로그램인 SAFETI를 활용하여 액화수소충전소의 안전성을 분석하고, 조건부 허용영역인 개인적·사회적 위험도와 설비별 위험도 순위를 고려하여 설비 배치 등의 안전성 제고 방안에 대해 제안하였다.