Method for storing CO2 by using goaf of abandoned coal mine

Abstract

The invention discloses a method for storing CO2 by using a goaf of an abandoned coal mine, and belongs to the technical field of geological storage of the CO2. The method is specifically as follows:CO2 gas obtained after separation and enrichment from a fixed emission source is compressed to a supercritical state, is then injected into the goaf of the abandoned coal mine, and is permanently stored by using the goaf, a downhole abandoned laneway and a chamber space; through arrangement of pressure measuring wells, the CO2 storage condition is monitored; by performing rock movement control, retaining and reinforcing separating coal columns, arranging separating walls, and grouting for blocking gaps, the safety of CO2 storage is guaranteed. By the method, the storage mechanism is simple, the CO2 injection resistance is small, the injection cost is low, the geological exploration engineering quantity is small, management is easy, future reuse of the CO2 is facilitated, high-pressure injection in the earlier stage can relieve surface subsidence, the existing drilled holes, wellbores and other engineering in a mine field can be reused to reduce the engineering quantity, and associationof centralized CO2 emission sources in large thermal power plants and the like with the coal mine facilitates local CO2 storage.

Description

technical field [0001] The invention belongs to CO 2 The technical field of geological storage, specifically related to a method of using abandoned coal mine goafs to store CO 2 Methods. Background technique [0002] At present, the world's primary energy, especially China's primary energy is dominated by fossil energy, CO 2 Emissions keep growing. reduce CO 2 In addition to taking active measures to reduce emissions (such as improving energy efficiency, developing clean energy, etc.) 2 In addition to the absorption capacity (carbon sink), the CO produced 2 Artificial disposal has become the focus of attention in recent years. One of the CO 2 The artificial disposal method is to use CO 2 Synthetic products, good CO 2 utilization, but limited by technology, the potential is limited; therefore, the CO 2 Sequestration has become an area of ​​intense research. [0003] Currently CO 2 The places of artificial storage are mainly ocean and underground. [0004] CO 2 O...

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Problems solved by technology

[0006] Although storage in deep saline aquifers has the advantages of large storage capacity and safety, it is currently the most researched, most widely used, and most promising CO storage method. 2 storage technology, but there are many difficulties and challenges in deep saline l

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