成果報告書詳細
管理番号20150000000376
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 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2015/6/16
報告書年度2014 - 2014
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. Establishment of numerical model
(1) Establishment of numerical model
The numerical model to forecast behaviors of atmospheric hydrogen sulfide (H2S) dispersion was applied to the wind tunnel experiment of precedents.
The complex terrain of the mountains where geothermal power plants are located in real scale, H2S discharge conditions from the cooling tower, weather conditions are taken into the numerical model. Using standard k-ε turbulence model for modeling turbulence, dispersion state of H2S was calculated. The numerical model results and wind tunnel experiments are compared regarding H2S dispersion situation such as the ground level concentration and maximum ground level concentration distance from H2S discharge point.

(2) Technical cooperation to clarify influence factors on the behaviors of hydrogen sulfide
It seems to be more applicative for the future EIA to implement more investigation based on the scenario analysis by adopting RANS which can calculate the steady state airstream more convenient than LES. Since various RANS models have been released on science or business basis, CFX (ANSYS, Inc.) and STREAM (Software Cradle Co., Ltd.) were installed and compared based on the input method for the geographical data (published by Geospatial Information Authority of Japan) and the output of the dispersion simulation.

2. Performance evaluation of numerical model forecasting behaviors of atmospheric hydrogen sulfide
(1) Planning of wind-tunnel experiment
In order to validate the developed numerical model, the wind tunnel experiments were designed. The selection of simulation areas of the wind-tunnel experiments was carried out. Among the geothermal sites reported by Geothermal Development Promotion Survey of NEDO (: New Energy and Industrial Technology Development Organization), seven sites were, firstly, selected based on the follow three criteria.
a) The magnitude of the geothermal energy potential is more than 10,000 kW.
b) Enough emissions of the geothermal steam to generate electricity have already been confirmed.
c) Detailed information of the geothermal wells including the accurate location (longitude, latitude and depth) and the inside temperature and pressure, has already been investigated.
Analyses of the topographies over the selected sites were, then, conducted and, four geothermal sites are, finally, selected as the simulation areas of the wind tunnel experiments. Two wind tunnel experiments in scales of 1:500 and 1:1000 were designed and, their experimental settings, related with the air flow and the tracer gas diffusion, were formulated, referring from those in the past assessment reports.
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