Apparatus for injecting carbon dioxide into underground, method for evaluating same, and method for producing same
AssigneeKyushu University, National University Corporation
InventorsTakeshi Tsuji, Shigenori Fujikawa
Life of this patent
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Abstract
An object of the present invention is to provide an apparatus for injecting carbon dioxide into underground capable of capturing carbon dioxide from the atmosphere and injecting it into underground in a harmless state and at a low cost, the apparatus including: a capturing unit configured to concentrate carbon dioxide directly from the atmosphere and capture concentrated carbon dioxide as a mixture gas; and an injection well connected to the capturing unit for pressurizing the mixture gas and injecting the mixture gas into an underground reservoir, in which the capturing unit adjusts a proportion of carbon dioxide in the mixture gas to 25% by volume or more.
Claims14
An apparatus for injecting carbon dioxide into underground, the apparatus comprising:
- a capturing unit configured to concentrate carbon dioxide directly from an atmosphere and capture concentrated carbon dioxide as a mixture gas;
- an injection well for pressurizing the mixture gas and injecting the mixture gas into an underground reservoir, which is connected to the capturing unit;
- a CPU;
- a memory unit;
- and
- a control unit,
- wherein the CPU obtains the proportion of carbon dioxide in the mixture gas using a program stored in the memory unit such that a density of pressurized carbon dioxide in the reservoir based on a depth of the reservoir is within a predetermined range, and
- said control unit controls a degree of concentration of carbon dioxide in the capturing unit so as to match the proportion of carbon dioxide in the mixture gas obtained by said CPU.
A method for evaluating an apparatus for injecting carbon dioxide into underground, said apparatus comprising:
- a capturing unit configured to concentrate carbon dioxide directly from the atmosphere and capture concentrated carbon dioxide as a mixture gas;
- and
- an injection well for pressurizing the mixture gas and injecting the mixture gas into an underground reservoir, which is connected to the capturing unit,
- wherein the capturing unit adjusts a proportion of carbon dioxide in the mixture gas to 25% by volume or more, said method comprising:
- calculating the density of pressurized carbon dioxide in the reservoir so as to obtain storage efficiency of carbon dioxide based on the proportion of carbon dioxide in the mixture gas and the depth of the reservoir.
A method for producing an apparatus for injecting carbon dioxide into underground, said apparatus comprising:
- a capturing unit configured to concentrate carbon dioxide directly from the atmosphere and capture concentrated carbon dioxide as a mixture gas;
- and
- an injection well for pressurizing the mixture gas and injecting the mixture gas into an underground reservoir, which is connected to the capturing unit,
- wherein the capturing unit adjusts a proportion of carbon dioxide in the mixture gas to 25% by volume or more, said method comprising:
- calculating a total cost of a cost for capturing the mixture gas in a case in which the capturing unit adjusts the proportion of carbon dioxide in the mixture gas to 99% by volume, a cost for transporting the mixture gas from the capturing unit to the injection well, and a cost for storing the mixture gas, and
- determining (1) the proportion of carbon dioxide in the mixture gas;
- (2) the horizontal distance between the capturing unit and the injection well;
- and (3) the depth of the reservoir so that the cost is equal to or less than the total cost.
Dependencies are inferred from the claim text.