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水足迹是水资源占用的综合评价指标,能够量化人类活动对水资源和水环境的影响,为水资源的高效利用与可持续管理提供科学参考.本文在WFN水足迹评价方法和国际标准水足迹评价方法的基础上,提出了基于生命周期的包含蓝水足迹、灰水足迹和间接水足迹的能源系统水足迹评价模型.将此模型应用到煤炭生产,计算了我国单位煤炭生产的水足迹.研究结果表明,我国1 GJ煤炭生产的水足迹为0.19 m~3,水足迹的80%来源于采掘过程,从水足迹类型来看,灰水足迹占到了87%的比例.本研究为能源系统水足迹评价提供了方法理论,并可为以煤炭为原料或燃料的下游产品水足迹评价提供数据支撑.
Water footprint is a comprehensive evaluation index of water resources occupation, which can quantify the influence of human activities on water resources and water environment, and provide a scientific reference for the efficient use and sustainable management of water resources.This paper is based on WFN water footprint assessment method and international standard water footprint Based on the evaluation method, a water footprint evaluation model of energy system based on life cycle is proposed, which includes blue water footprint, gray water footprint and indirect water footprint.This model is applied to coal production and the water footprint of coal production in China is calculated. The results show that the water footprint of 1 GJ coal production in China is 0.19 m 3, and 80% of the water footprint comes from the mining process, and from the water footprint type, the gray water footprint accounts for 87% Water Footprint Evaluation provides a methodology and can provide data support for water footprint assessment of downstream products based on coal as feedstock or fuel.