Abandoned flooded coal mine water heat storage potential calculation method

Abstract

The invention discloses an abandoned flooded coal mine water heat storage potential calculation method, and belongs to the field of geothermal resource development and utilization. The method comprises the following steps: selecting a typical long-arm mining working face of a coal mine, calculating the volume of an inverted funnel-shaped trapezoidal structure of two overlying strata zones of a goaf according to various parameters of the working face, and calculating a gap, namely a water storage volume, of two overlying zones of the goaf of a single selected typical working face according to an average crushing coefficient / void ratio of the two zones; investigating basic parameters of the abandoned coal mine, and judging the sum of gap water storage volumes of a shaft, a roadway and a stope working face goaf as the total volume of abandoned coal mine water heat storage; and finally, evaluating the waste coal mine water heat storage static potential through thermodynamic calculation by utilizing the waste coal mine water heat storage total volume. The method is accurate in estimation and small in error, comprehensively considers the conditions of different wells, roadways and stopes in the abandoned mine, can be used for rapidly estimating the heat storage capacity of the abandoned mine, and provides basic data reference for water pumping tests and engineering design in the geothermal development and utilization process of the abandoned mine.

Description

technical field [0001] The invention relates to a heat storage potential calculation method, in particular to an abandoned flooded coal mine water heat storage potential calculation method suitable for use in abandoned flooded mines, and belongs to the field of geothermal resource development and utilization. Background technique [0002] The research on the development and utilization of closed / abandoned coal mine resources started relatively late in China, with weak basic theories and key technologies, and relevant theoretical research and technological innovation are imminent. [0003] Among the many modes of resource utilization of abandoned coal mines, the research and practice of using the inherent properties of abandoned coal mines to combine them with the development and utilization of renewable energy has attracted widespread attention. At present, there are mainly four forms of such research and practice: ground solar and wind power generation, mine hydrothermal st...

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Problems solved by technology

Taking the construction of underground reservoirs in coal mines as an example, although the technology and method for determining the storage capacity and water storage coefficient based on this concept take into account the void space of the overlying stratum in the underground goaf, it cannot effectively capture the vertical distribution of voids in the caving zone and fracture zone. Change characteristics, and lack of comprehensive analysis of shaft and roadway space, there are differences between production and abandoned mines

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