천연가스/수소 혼합연료 공급장치의 압력조정·혼합제어 및 안전성 평가에 관한 연구 = A Study on Pressure Regulation, Mixing Control, and Safety Evaluation of a Natural Gas/Hydrogen Blended Fuel Supply Device

다국어 초록 (Multilingual Abstract)

As carbon-neutral energy transition accelerates, hydrogen-enriched natural gas has emerged as a promising transitional fuel for industrial combustion systems, gas engines, and distributed energy applications. However, due to the significant differences in physical properties between hydrogen and natural gas, the conventional fuel supply system designed for methane-dominant operation may experience instability in pressure regulation, flow control, mixing uniformity, and safety performance under blended fuel conditions. This study analyzes the system configuration and operational characteristics of a natural gas/hydrogen blended fuel supply device with a focus on pressure regulation, mixing control, and safety design. The major subsystem functions, including gas reception, pressure reduction, flow metering, proportional mixing, leak prevention, and emergency shutdown, are reviewed based on engineering design requirements. Furthermore, the influence of hydrogen blending ratio on flow behavior, pressure fluctuation, and combustion supply stability is theoretically examined. The results indicate that hydrogen blending increases the sensitivity of pressure drop and flow control due to lower density, higher diffusivity, and wider flammability characteristics. Accordingly, a dedicated integrated fuel supply architecture consisting of multi-stage pressure regulation, real-time mixing control, leak monitoring, and interlock-based safety shutdown is required for stable operation. This study provides a practical engineering basis for the design and application of blended fuel supply devices in hydrogen transition energy systems.