成果報告書詳細
管理番号20150000000374
タイトル*平成26年度中間年報 地熱発電技術研究開発 発電所の環境保全対策技術開発 地熱発電所に係る環境アセスメントのための硫化水素拡散予測数値モデルの開発
公開日2015/6/16
報告書年度2014 - 2014
委託先名一般財団法人電力中央研究所
プロジェクト番号P13009
部署名新エネルギー部
和文要約
英文要約Title: Research and Development of Geothermal Power Generation Technology, Technology Development for Environment Preservation Measures of Power Plants, Development of Numerical Models for Predicting the Dispersion of Hydrogen Sulfide in the Environmental Impact Assessments of Geothermal Power Plants (FY2013-FY2015) FY2014 Annual Report


We have continued to develop two types of numerical models for predicting the surface concentrations of hydrogen sulfide emitted from geothermal power plants. The first model is a simple plume model which is considered to be valid in relatively mild terrains with very low computational cost. We added the function of predicting visible plumes from the cooling tower in power plants into the model. The accuracy of the model was checked by comparing the results of wind-tunnel experiments. With this model, there are some discrepancies between the predicted and observed data. Further inspections are demanded to clarify the applicability of this simple model.
The second model is a computational fluid dynamics model which is expected to be an alternate of wind-tunnel experiments. In FY2013, there is disagreement in the wind field over the area of the wake region behind a ridge. This mismatch was solved by optimizing the mesh resolutions near ground. We also examined the dependency of model accuracy on computational grid types, and revealed that some grid types are not appropriate for accurate predictions.
Additional wind-tunnel experiments were carried out to check the influences of surface roughness of model terrains. Two types of surface, i.e. aerodynamically smooth and rough, were adopted in the experiments. Our study indicates that the maximum surface concentration is significantly affected by surface roughness due to the difference in the formation of the wake regions of a ridge. This knowledge will be reflected in the model development next year.
We have also conducted a series of survey regarding the regulations or criteria of the ambient concentration levels of hydrogen sulfide to support the evaluations of the predicted concentrations in environmental impact assessments of geothermal power plants.
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