Method and device for building underground storehouse by dissolving limestone with carbon dioxide
US9850756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2012 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | Dec 26, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for building an underground storehouse by dissolving limestone with carbon dioxide, the method comprising the following steps: a.) drilling two wells extending from the ground surface (1) to a limestone layer (2), building a channel (5) allowing the two wells to communicate, and installing casing pipes (3, 4) respectively in the two wells; b.) introducing CO2 gas having at least 1 MPa of pressure into a CO2 absorbing solution having the same pressure to form a CO2 solution, flowing the CO2 solution into underground via the casing pipe (3) to react with the limestone to form a calcium bicarbonate solution, forming a cavern in the meanwhile, and discharging the calcium bicarbonate solution via the other casing pipe (4); c.) decompressing the discharged calcium bicarbonate solution to decompose the calcium bicarbonate contained in the solution into CO2, water and calcium carbonate, and recycling the separated CO2 absorption solution and the CO2; repeating steps b.) and c.) until a cavern meeting design requirements is formed, and discharging the solution from the cavern to form the underground storehouse (6). Also disclosed is a device for building an underground storehouse b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.