Abstract
Flare stacks, used for emergency venting of redundant hydrogen, can cause jet fires that pose thermal hazards to the surrounding environment. To accurately predict the hazard distance of hydrogen flare, it is necessary to develop a new flare radiation model. Also, the numerical simulations of hydrogen flame are carried out to assess the radiation hazard area of the flares. The results show that the hazard distances predicted by the numerical method and the new model agree well with the HSL data fitted by exponential regression, and the errors are less than ±5%. Furthermore, the new model and simulations were used to analyze the distribution of thermal radiation for hydrogen flare under various release conditions. Increasing the release rates will drive the hazard boundary of flare system to expand. Additionally, as flare height increases, the radiation damage from the flare flame on ground is reduced due to buoyancy of combustion products.
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