Research on pumped storage and complementary energy development models for abandoned mines in China

Within the framework of achieving carbon neutrality,various industries are confronted with fresh challenges.The ongoing process of downsizing coal industry operations has evolved into a new phase,with the burgeoning proliferation of abandoned mines posing a persistent issue.Addressing the challenges and opportunities presented by these abandoned mines,this paper advocates for a scientific approach centered on the advancement of pumped storage energy alongside gas-oil complementary energy.Leveraging abandoned mine tunnels to establish pumped storage power stations holds significant ecological and economic importance for repurposing these sites.This initiative not only serves as an effective means to restore the ecological balance in mining regions but also provides an environmentally friendly approach to repurposing abandoned mine tunnels,offering a blueprint for economically viable pumped storage power stations.This article delineates five crucial scientific considerations and outlines seven primary models for the utilization of abandoned mine sites,delineating a novel,comprehensive pathway for energy and power development that emphasizes multi-energy complementarity and synergistic optimization within abandoned mines.

Simulation research on carbon dioxide as cushion gas in gas underground reservoirs

Aimed at the problem of mixing working gas and cushion gas in carbon sequestration technology, the feasibility of using carbon dioxide as the cushion gas in reservoirs is discussed firstly. At the usual condition of reservoirs, carbon dioxide is a kind of supercritical fluid with high condensability, high viscosity and high density. Secondly, this article studies the laws of formation and development of mixing zone by numerical simulation and analyses the impact on mixing zone brought by different injection modes and rational ratios of cushion gas in reservoirs. It is proposed that the appropriate injection ratio of cushion gas is 20%-30%. Using carbon dioxide as cushion gas in gas reservoirs is able to make the running of natural gas reservoirs economical and efficient.

基于InVEST模型的围场县小滦河流域碳储量空间分布及热点区域分析

区域生态系统服务功能的量化评估,是发现区域生态问题、制定针对性的生态环境保护措施的重要前提。当前,围场县小滦河流域存在着植被生产力水平低下、生态系统固碳功能较弱等生态问题。研究围场县小滦河流域的区域碳储量现状及空间分布格局,能够为当地解决生态问题提供重要的依据。本研究基于InVEST模型,利用实地调查数据结合遥感影像解译的方法,对围场县小滦河流域的碳储量现状和空间分布进行了分析,同时用热点分析方法,对围场县小滦河流域生态系统固碳功能的热点区域进行识别。结果表明:2021年围场县小滦河流域总碳储量为1.47×10^(7)Mg,其中林地碳储量为5.37×10^(6)Mg,占总碳储量的36.64%。该区域单位面积碳储量的空间分布格局呈现出南高北低的特征,北部有少量高碳密度的区域零星分布。围场县小滦河流域生态系统固碳功能热点区主要分布于南部,占比28.59%,冷点区主要位于中部和北部,占比44.14%,非显著点占比较少,生态系统固碳功能空间分布极不平衡。因此,在热点区域应施以保护为主措施,减小人为干扰所造成的影响;而针对北部高原区的冷点区域,则应该实施以植被恢复为主的措施,比如在宜林区进行植树造林活动,以改善该区域固碳功能低下的现状。