成果報告書詳細
管理番号20140000000527
タイトル*平成25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 硫化水素拡散予測シミュレーションモデルの研究開発
公開日2014/8/15
報告書年度2013 - 2013
委託先名日揮株式会社 学校法人明星学苑明星大学
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Summary

1. Study for the diffusion behaviors of hydrogen sulfide
(1) Research of the influence factors on the behaviors of hydrogen sulfide

As a part of the development of the numerical model forecasting behaviors of atmospheric hydrogen sulfide emitted from the geothermal power plant, the factors controlling its surface concentration field are investigated. From the basic plant information including the plant performance, the plant facilities, the geography of surrounding area and the assessment result using the wind tunnel, seven power plants located at the steep mountainous area are selected as targets of this investigation. The parameters associated with the plant facilities, geographical location, emission of hydrogen sulfide and weather condition are extracted from assessment reports for individual power plants. The relationships between their parameters and surface concentration of atmospheric hydrogen sulfide were, then, investigated, and the factors controlling its surface concentration field were specified.

(2) Preliminary study for the establishment of numerical model

This study was carried out on the basis of the research results of the environmental impact survey of geothermal power plant, wind tunnel experiments and numerical models relating to atmospheric dispersion of hazardous material.
As for parameter study for the numerical model, complex slopes of the terrains are considered for their larger impact on the wind speed near ground surface in the numerical model. The computational grid size is set to 10m or below to reflect the impact of the buildings in the vicinity of the emission source.
As for influence factors, terrains and structures beyond 10m height on site are reproduced in numerical model. Temperature, wind direction and vertical distribution of wind velocity are treated as flow conditions. In accordance with the method of wind tunnel experiment, emission sources are treated as boundary conditions.
As for preliminary study with trial calculations, preliminary study was carried out through the trial calculations using general purpose CFD soft wares. It was confirmed that the complex terrains can be expressed by creating a computational grid from the map information.

(3) Technical cooperation to clarify influence factors on the behaviors of hydrogen sulfide

In order to reproduce the results of the wind tunnel with the 3-D numerical simulation analysis, the simulation domain should include not only the wind tunnel model, which represents the target buildings and domain, but also all of the windward side with the roughness blocks that create the vertical profile of wind speed. In a case where an overload of the calculation is concern due to the larger simulation domain, it is also recommended for the simulation domain to include only the wind tunnel model and adopt “the log-law wind profile” or “power law of wind profile” to create the boundary conditions of wind speed around the simulation domain.
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