Method for sequestering carbon dioxide

A carbon dioxide and liquid carbon dioxide technology, applied in the direction of carbon dioxide storage, storage devices, transportation and packaging, etc., can solve the problems of high cost, complicated treatment process, obvious greenhouse effect, etc., achieve low cost, wide application range, and reduce emissions Effect

Inactive Publication Date: 2013-02-27
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method to design a method for injecting carbon dioxide gas into non-minable coal seams or goafs to sequester carbon dioxide, aiming at the problems of large amount of carbon di

Method used

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  • Method for sequestering carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 A method for sequestering carbon dioxide shown, comprises the steps:

[0023] (1) Selection of injection horizon: the injection horizon includes the goaf 11 and the unminable thin coal seam 17 above it, and the upper side of the unminable thin coal seam 17 of the selected injection horizon has a sandy mudstone layer with a thickness greater than 2m Or mudstone layer 16 exists.

[0024] Here, the injection site where the injection layer is located should be selected first: to make the injected CO 2 It can be better sealed. In order to prevent hidden dangers after injection, the injection site cannot be selected in the goaf 11 of the coal mine being mined, nor can it be selected in the goaf 11. The upper coal seam has been mined, and the lower part is not far away (generally not far away) Areas where coal seams over 200m) still need to be mined. Therefore, the injection site is selected to inject carbon dioxide sequestration construction in the abandon...

Embodiment 2

[0089] Depend on figure 2 The shown method for sequestering carbon dioxide differs from that of Example 1 in that: in step (1), the injection horizon includes the goaf 11 and the unminable thin coal seams located on the upper side and the lower side of the goaf 11 respectively 17. In this case, the upper and lower parts of the goaf 11 formed by the mineable coal seam have non-minable thin coal seams 17. For cost considerations, the upper and lower non-minable thin coal seams 17 are separated from the goaf 11 respectively. At this time, both the thin coal seams at the upper and lower parts of the goaf 11 will be injected, and the goaf 11 will be injected at the same time. The strata from top to bottom are: mudstone or sandy mudstone layer 16, sandstone layer 18, unminable thin coal seam 17, sandstone layer 18, mudstone or sandy mudstone layer 16, curved subsidence zone 14, fissure zone 13, caving Belt 12, goaf 11, mudstone or sandy mudstone layer 16, sandstone layer 18, unmin...

Embodiment 3

[0096] Depend on image 3 The difference between the shown method for sequestering carbon dioxide and that of Embodiment 1 is that in step (1), the injection layer only consists of several unminable thin coal seams 17 from top to bottom. However, due to cost considerations, the burial depth of these thin coal seams should not exceed 800m. The top and floor of each unminable thin coal seam 17 have a sandstone layer 18 and the upper side of the upper sandstone layer 18 and the lower side of the lower sandstone layer 18 all have mudstone or sandy mudstone layers 16 .

[0097] In step (2), the wellbore is drilled with a double-split wellbore structure: when carbon dioxide is injected only in several non-recoverable coal seams, the wellbore structure is similar to that of conventional CBM wells, that is, the double-split wellbore structure is adopted , while considering the drilling cost, the drill bit diameter is relatively small. The details are as follows: the first opening us...

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Abstract

The invention discloses a method for sequestering carbon dioxide. The method includes the following steps: (1) selecting the injection layer which includes an unworkable seam and/or a coal seam gob; (2) drilling a well according to the position where the injection layer is located; (3) performing perforating for a fissure zone of a top plate of the unworkable seam and/or the coal seam gob; (4) sequentially injecting carbon dioxide from bottom to top layer by layer when the number of the needed injection layer is larger than one, and performing injecting and sealing storage for the next injection layer after completing injecting and sealing storage for the former injection layer; and (5) burying the drilled well and sealing a cover on the drilled well. The method for sequestering carbon dioxide aims at solving the problems of large carbon dioxide emission, obvious greenhouse effect, complex processing procedures, high expanse and the like of the existing coal power generation mode, and achieves the purposes of permanently sequestering carbon dioxide and reducing carbon dioxide treatment expanse by adopting the carbon dioxide sequestering method of injecting carbon dioxide gases into the unworkable seam or the coal seam gob to sequester carbon dioxide.

Description

technical field [0001] The invention relates to a process and method for sequestering carbon dioxide in a goaf and / or an unminable coal seam. Background technique [0002] Coal plays an important role in my country's primary energy structure. Coal is an important energy source, and power generation is one of its important uses. Studies have shown that: under normal circumstances, 1 ton of coal for power generation will produce 2.66-2.72 tons of carbon dioxide gas. Under the same conditions, CO 2 The greenhouse effect of methane is 20 to 25 times that of methane. These gases are directly discharged into the atmosphere, which will cause global warming and cause huge changes in the living environment of human beings. to the CO produced 2 Artificial disposal has become the focus of attention in recent years. [0003] Currently, the treatment of CO 2 The main methods are: (1) capture, collect, store and store carbon emissions in a safe manner in deep geological structures or...

Claims

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Application Information

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IPC IPC(8): B65G5/00
CPCY02C10/14Y02C20/40
Inventor 陈文学倪小明刘明举王倩李全中
Owner HENAN POLYTECHNIC UNIV
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