中国における石炭輸送CO<sub>2</sub>排出削減の検討と先進火力発電導入評価

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  • Evaluation of CO<sub>2</sub> Emission Reduction on Advanced Thermal Power Generation Technology Considering Coal Transport Optimization in China
  • 中国における石炭輸送CO₂排出削減の検討と先進火力発電導入評価
  • チュウゴク ニ オケル セキタン ユソウ CO ₂ ハイシュツ サクゲン ノ ケントウ ト センシン カリョク ハツデン ドウニュウ ヒョウカ

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Objective. Coal has been the important primary energy in China. Coal-fired power generation stays on the significant position due to the rich coal resources. The coal flow depends on the railways and coastal shipping because energy producing and consuming regions are geographically distinct. Thus, it is necessary to reduce CO2 emission not only in generating electricity but also in coal transportation. This study is aimed to estimate CO2 emission reduction potential in coal transportation in China. Directions of coal transportation were evaluated using a geographic information system (GIS). In this study, a liner programming (LP) analysis model is used for the optimization of coal transportation for minimizing its CO2 emission and costs. We have also evaluated in the case of ultra super critical power plant (USC) as advanced thermal power generation technology.<BR>Results and Discussion. From the result of current flow, the coal transportation from the north of the inland which is a coal production region to the east of the coastal place that is a coal consuming area is supposed to be a mainstream. On the other hand, the south area that coal production is poor has a big consumption in Guangdong. Therefore, the coal has been carried from all areas except the northeast to the south area by coast transportation. South-eastern coastal regions such as Zhejiang and Guangdong have high dependency on the coastal transportation show twice higher CO2 emission in coal transportation than other regions. In the case of the optimization with the restriction on coastal transportation to reduce CO2 emission, the amount of emissions in coal transportation becomes smaller and gets to be minimum amount of 12.3 Mt-CO2 under the CO2 emission minimization analysis. Moreover, replacing USC for existing conventional thermal power plants makes the CO2 emission reductions in transportation much smaller amount, 8.1 Mt-CO2, because of not just shortening transportation distance and shift in transportation but decreasing amount of transportation due to less coal consumption of USC.<BR>Conclusions. From the results obtained by minimizing CO2 emission in transportation, the amount of CO2 emission reductions is 6.0 Mt-CO2 from the current coal transportation. The amount of CO2 emission reductions in transportation is estimated to be higher, 10.2 Mt-CO2, in case that USC is replaced for existing conventional thermal power plant with less coal consumption.

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