Apparatus for making underground reservoir

Patent metadata

Field	Value
Publication number	US-10415388-B2
Application number	US-201715825084-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	May 6, 2011
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A device for constructing an underground reservoir by dissolving limestone using carbon dioxide. The device includes a CO2 storage tank; an absorption tower; a decompression valve; a gas-liquid separator; a crystallizer; a vacuum pump; a buffer tank; a first booster pump; a second booster pump; and a third booster pump. The decompression valve is connected to a limestone layer, and is connected to the gas-liquid separator. The absorption tower is connected between the gas-liquid separator and the limestone layer.

First claim

The invention claimed is:

1. A device for constructing an underground reservoir by dissolving limestone using carbon dioxide, the device comprising:
a) a CO 2 storage tank;
b) an absorption tower;
c) a decompression valve;
d) a gas-liquid separator;
e) a crystallizer;
f) a vacuum pump;
g) a buffer tank;
h) a first booster pump;
i) a second booster pump; and
j) a third booster pump;

wherein
the absorption tower comprises a CO 2 gas inlet, a CO 2 gas outlet, a CO 2 absorption solution inlet, and a CO 2 solution outlet;
the CO 2 gas inlet of the absorption tower is connected to a gas outlet of the CO 2 storage tank via a first pipe; the CO 2 absorption solution inlet of the absorption tower is connected to a liquid outlet of the first booster pump via a second pipe; the CO 2 gas outlet of the absorption tower is connected to a gas inlet of the third booster pump via a third pipe;
a gas inlet of the CO 2 storage tank is connected to a gas outlet of the second booster pump and a gas outlet of the third booster pump via pipes;
the gas-liquid separator comprises a CaHCO 3 solution inlet, a CO 2 gas outlet, and a solution outlet; the CaHCO 3 solution inlet is connected to a liquid outlet of the decompression valve via a fourth pipe; the solution outlet of the gas-liquid separator is connected to a solution inlet of the crystallizer via a fifth pipe;
the crystallizer comprises the solution inlet, a CO 2 gas outlet, a CO 2 absorption solution outlet, and a CaCO 3 slurry outlet; the CO 2 gas outlet is connected to an inlet of the vacuum pump via a sixth pipe; the CO 2 absorption solution outlet is connected to a liquid inlet of the first booster pump via a seventh pipe; the seventh pipe connecting the first booster pump and the crystallizer is provided with a connector for supplementing the CO 2 absorption solution; and
a gas inlet of the buffer tank is connected to the CO 2 gas outlet of the gas-liquid separator and an outlet of the vacuum pump; and a gas outlet of the buffer tank is connected to a gas inlet of the second booster pump.

2. The device of claim 1 , wherein
the crystallizer comprises a settling chamber, a stripping chamber, a nozzle, a feeding pump, and a heat exchanger;
the settling chamber comprises the CaCO 3 slurry outlet and the CO 2 absorption solution outlet; the stripping chamber is disposed above and communicates with the settling chamber; the CO 2 gas outlet is disposed at the top of the stripping chamber; and
the nozzle is disposed in the stripping chamber; a liquid inlet pipe of the nozzle is connected to a liquid outlet of the heat exchanger, and a liquid inlet of the heat exchanger is connected to a liquid outlet of the feeding pump, and a liquid inlet of the feeding pump is connected to the solution outlet of the gas-liquid separator.

Assignees

• Univ Sichuan

Inventors

• Liu Jianfeng
• Xie Heping
• Wang Yufei
• Xie Lingzhi
• Zhang Ru

Classifications

• E21D13/00 Primary

  Large underground chambers; Methods or apparatus for making them (lining E21D11/00) · CPC title

• C09K8/38

  Gaseous or foamed well-drilling compositions · CPC title

• E21B43/28 Primary

  Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B43/241 takes precedence) · CPC title

• B65G5/00

  Storing fluids in natural or artificial cavities or chambers in the earth · CPC title

• E21B43/40

  Separation associated with re-injection of separated materials {(E21B43/385 takes precedence)} · CPC title