CO2 removal device

Patent metadata

Field	Value
Publication number	US-10035099-B2
Application number	US-201515301099-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Jul 9, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A CO 2 removal device includes: a CO 2 capturing material which captures H 2 O and CO 2 in a gas; a reaction container which contains the CO 2 capturing material; an H 2 O measuring unit for measuring the concentration of H 2 O in the gas; an H 2 O concentration adjustment device which adjusts the concentration of H 2 O on the basis of information obtained by the H 2 O measuring unit; a gas introduction path introducing the gas into the reaction container from the H 2 O concentration adjustment device and bringing the gas into contact with the CO 2 capturing material; a first gas discharge path discharging the gas from the reaction container after the gas has been brought into contact with the CO 2 capturing material; and a second gas discharge path discharging the gas that has been desorbed from the CO 2 capturing material from the reaction container.

First claim

The invention claimed is:

1. A CO 2 removal device comprising:
a CO 2 capturing material which captures H 2 O and CO 2 in a gas;
a reaction container which contains the CO 2 capturing material;
an H 2 O measuring unit for measuring the concentration of H 2 O in the gas;
an H 2 O concentration adjustment device which adjusts the concentration of H 2 O on the basis of information obtained by the H 2 O measuring unit;
a gas introduction path for introducing the gas into the reaction container from the H 2 O concentration adjustment device and bringing the gas into contact with the CO 2 capturing material;
a first gas discharge path for discharging the gas from the reaction container after the gas has been brought into contact with the CO 2 capturing material; and
a second gas discharge path for discharging the gas that has been desorbed from the CO 2 capturing material from the reaction container.

2. The CO 2 removal device according to claim 1 , wherein the CO 2 capturing material contains at least one kind selected from the group consisting of a metal oxide, an activated carbon, a carbonate of alkali metal, a hydroxide of alkali metal, a layered double hydroxide, and a solid organic compound.

3. The CO 2 removal device according to claim 2 , wherein the CO 2 capturing material contains an oxide or a complex oxide containing at least one metal element selected from the group consisting of cerium, a rare-earth metal other than cerium, and zirconium.

4. The CO 2 removal device according to claim 1 , comprising two or more the reaction containers.

5. The CO 2 removal device according to claim 4 , wherein:
at least one of the reaction containers has a capturing material containing an oxide or a complex oxide containing at least one metal element selected from the group consisting of cerium, a rare-earth metal other than cerium, and zirconium; and
the other reaction container of the reaction containers has a capturing material containing at least one metal oxide selected from the group consisting of silica, alumina, and zeolite.

6. The CO 2 removal device according to claim 5 , wherein, when a capturing material containing an oxide or a complex oxide containing at least one metal element selected from the group consisting of cerium, a rare-earth metal other than cerium, and zirconium is defined as a capturing material A, a capturing material containing at least one metal oxide selected from the group consisting of silica, alumina, and zeolite is defined as a capturing material B, and CO 2 , H 2 O, or both of them is/are removed from the gas, a circulation of the gas is directed from the capturing material A to the capturing material B.

7. The CO 2 removal device according to claim 1 , further comprising a heating means to heat the CO 2 capturing material.

8. The CO 2 removal device according to claim 1 , wherein:
a heating fluid is configured so as to touch the CO 2 capturing material; and
the heating fluid is a fluid containing at least one gas selected from the group consisting of CO 2 , water vapor, N 2 , a combustion exhaust gas, and a gas obtained by being heated after taken in from the atmosphere.

9. The CO 2 removal device according to claim 8 , wherein a direction of a circulation of the gas is identical to a direction of a circulation of the heating fluid.

10. The CO 2 removal device according to claim 8 , wherein a direction of a circulation of the gas is opposite to a direction of a circulation of the heating fluid.

11. The CO 2 removal device according to claim 7 , comprising a device for circulating a heating medium of a temperature higher than the CO 2 capturing material in a heat transfer device and heating the CO 2 capturing material by the heat transferred from the heat transfer device.

12. The CO 2 removal device according to claim 11 , wherein the high temperature heating medium is a gas containing water vapor.

13. The CO 2 removal device according to claim 7 , wherein the heating means is a device to heat by electric power.

14. The CO 2 removal device according to claim 1 , further comprising a depressurizing device for depressurizing the reaction container.

15. The CO 2 removal device according to claim 1 , further comprising a pressurizing device for pressurizing the reaction container.

16. The CO 2 removal device according to claim 1 , wherein the gas has a pressure higher than the atmospheric pressure.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Yoshikawa Kouhei
• Kaneeda Masato
• Nakamura Hidehiro
• Shirasaka Toshiaki

Classifications

• Y02C20/40

  of CO2 · CPC title

• B01J20/06 Primary

  comprising oxides or hydroxides of metals not provided for in group B01J20/04 · CPC title

• B01D2259/402

  using two beds · CPC title

• B01D2259/4009

  using hot gas · CPC title

• B01D53/346

  Controlling the process · CPC title