STPA 기법을 활용한 패키지형 수소충전소의 안전성 강화 모델

Abstract

In order to solve the global warming problem, the development and supply of eco-friendly energy has become an important issue in worldwide, and among eco-friendly energy, hydrogen energy is gradually expanding as a sustainable energy source. In addition, hydrogen energy is the most closely related energy source to life of citizens and is developing as a future growth engine that can be used in residential, transportation, and industrial fields. However, since most people are not sure about the safety of hydrogen energy, such as hydrogen explosion, research on the safety of hydrogen energy is absolutely necessary. This study studies a safety enhancement model for a off-site packaged hydrogen refueling station that transports the produced hydrogen to the hydrogen refueling station. Although there are various methods for research to enhance the safety of packaged hydrogen refueling stations, this study proposes a model to which the STPA (System-Theoretic Process Analysis) technique is applied, which can be applied to various fields related to recent safety. In order to strengthen the safety of the hydrogen refueling station, the process flow diagram of the packaged hydrogen refueling station was analyzed, and based on this, a risk analysis was derived for the compression system and priority panel of the hydrogen refueling station through the STPA implementation step-by-step process. In this study, a safety reinforcement model applied with the STPA technique that can consider control issues between the entire system and components, not specific components, was proposed to enhance the safety of the packaged hydrogen refueling station. This thesis suggests the following safety reinforcement model compared to the basic research for improving the safety of hydrogen refueling stations. 1) Propose an integrated ESD system that can respond to ESD failures 2) Proposal of an integrated FGS (flame & gas system) that can detect hydrogen leakage, density and flame and operate firefighting equipment 3) Propose a safety-related system (SRS) that can meet international standards related to gas stations. 4) Propose a forced ventilation system that can interfere with a fire or explosion environment due to hydrogen leakage and retention, and an Independent Protection Layer (IPL) system that the proposed system can respond to ESD failures. Although this study proposes a model to which the STPA technique is applied to enhance safety for off-site packaged hydrogen refueling stations, safety enhancement studies for on-site hydrogen refueling stations and various transportation methods should be added.