Method for storing carbon dioxide gas in a goaf filled with porous media

Abstract

The invention relates to a method for storing carbon dioxide gas in a goaf filled with porous media. The method uses crushed gangue, fly ash and cement to make a square porous media; The working face is filled with the above-mentioned square porous media to form an effective support for the roof of the goaf and ensure the long-term stability of the roof of the goaf; The goaf filled with porous media forms a closed space; finally, the carbon dioxide gas produced by the thermal power plant is injected into the closed space to form a long-term storage of carbon dioxide gas. The method of storing carbon dioxide gas in the goaf filled with porous media uses coal mine solid waste to fill the goaf, which not only avoids the ground subsidence caused by the collapse of the goaf, but also provides an ideal long-term storage of carbon dioxide gas. Space to reduce the greenhouse effect caused by carbon dioxide gas emissions.

Description

technical field [0001] The invention relates to a method for storing carbon dioxide gas, in particular to a method for storing carbon dioxide gas in a goaf filled with porous media. Background technique [0002] With the gradual depletion of coal resources in the central and eastern mining areas of my country, the center of coal mining in my country is gradually shifting to the west. However, in the large-scale development and utilization of coal resources in the west, there are mainly two problems: first, the coal resources in the west of my country are mostly distributed in arid, semi-arid deserts or Gobi areas, with thick coal seams, shallow burial, and lack of surface water resources , the ecological environment is extremely fragile. When the traditional caving method is used to deal with goafs, it is very easy to cause water loss and surface vegetation damage, which seriously endangers the local fragile ecological environment. Second, the western region itself is underd...

AI Technical Summary

Problems solved by technology

However, in the large-scale development and utilization of coal resources in the west, there are mainly two problems: first, the coal resources in the west of my country are mostly distributed in arid, semi-arid deserts or Gobi areas, with thick coal seams, shallow burial, and lack of surface water resources , the ecological environment is extremely fragile

When coal is used for thermal power generation, it will inevitably produce a large amount of carbon dioxide gas, causing the greenhouse effect, and will also cause serious harm to the already fragile ecological environment in the west

[0003] The existing research results are insufficient in dealing with the above problems: ①The existing goaf filling methods are mainly designed to control the movement of the overlying rock, without considering the problem of storing carbon dioxide gas in the later stage, resulting in the remaining Insufficient space, it is difficult to store a large amount of carbon dioxide gas, such as the full filling method of the goaf

Even in the goaf partial (strip) filling method, because the filling strips are all entities, the spaces between the strips are isolated from each other, and carbon dioxide gas cannot circulate in the isolated spaces, making it difficult to effectively store carbon dioxide gas; ② Already Some goaf carbon dioxide storage methods (methods for sequestering carbon dioxide, 2012104978620) store liquid carbon dioxide by using cracks formed when caving and processing gobs, which is costly and complicated, and relies on the complete overlying rock above the crack zone to realize carbon dioxide The advantages of sealing, suitable for the conditions of deep coal seam burial

In Northwest my country, the coal seam is buried shallow, the coal seam is thick, and the bedrock is thin, and the mining cracks can easily penetrate the overlying rock strata. The above methods for sequestering carbon dioxide are difficult to achieve long-term and effective sequestration of carbon dioxide.

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