Forced ventilation for sensing-based risk mitigation of leaking hydrogen in a partially open space
Forced ventilation for sensing-based risk mitigation of leaking hydrogen in a partially open space
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DOI：
10.1016/j.ijhydene.2010.02.068
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发表时间：
2010-05
影响因子：
7.2
通讯作者：
K. Matsuura;M. Nakano;J. Ishimoto
中科院分区：
文献类型：
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作者：
K. Matsuura;M. Nakano;J. Ishimoto
本研究对具有单个屋顶通风口的部分开放空间中的氢扩散进行了数值模拟。显示并讨论了各种屋顶通风口位置、泄漏位置、泄漏流量和排气流量对泄漏氢气的强制通风的影响。根据结果，确定了适当的屋顶通风位置以及恒定排气流量通风的缺点。为了克服这一缺点，提出了一种新的控制策略，通过将屋顶通风口固定在适当的位置来改变排气流量。首先构建一个图来显示不同流入速率和泄漏位置的可接受的排气流速。假设实时感测氢气浓度和高度方向速度，然后估计泄漏氢气的体积流量。根据估计的泄漏流量和屋顶附近的氢传感器信息，考虑可接受的排气流量与各种流入流量和泄漏位置的关系图来进行控制。所提出的方法针对各种泄漏位置、泄漏流量和泄漏模式进行了验证。本文提出了一种基于传感的创新方法，通过强制通风控制部分开放空间中氢气扩散和积累的风险。
This study performs the numerical simulation of hydrogen dispersion in a partially open space with a single roof vent. The effects of various roof vent positions, leak positions, leak flow rates and exhaust flow rates on the forced ventilation of leaking hydrogen, are shown and discussed. Based on the results, a proper roof vent position and the disadvantage of ventilation with constant exhaust flow rates are established. To overcome the disadvantage, a new control strategy to change exhaust flow rates with the roof vent fixed at the proper position is proposed. First a plot is constructed to show acceptable exhaust flow rates to various inflow rates and leak positions. Assuming real-time sensing of hydrogen concentration and height-direction velocity, volume flow rates of leaking hydrogen are then estimated. Based on the estimated leak flow rates and hydrogen sensor information near the roof, control is conducted considering the plot of acceptable exhaust flow rates to various inflow rates and leak positions. The proposed method is validated against various leak positions, leak flow rates and leak modes. This paper proposes an innovative approach to sensing-based risk mitigation control of hydrogen dispersion and accumulation in a partially open space by forced ventilation.