Carbon Dioxide Recovery System

• US 20130064720A1
• Filed: 08/23/2012
• Published: 03/14/2013
• Est. Priority Date: 09/12/2011
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yoshikawa, Kohei, Kaneeda, Masato, Orita, Hisayuki, Kanno, Shuichi, SATO, Hiroki
• Application Number:
  US13/592,951
• Publication Number:
  US 20130064720A1
• Time in Patent Office: Days
• US Class Current: 422/119
• CPC Class Codes: B01D 2256/22 Carbon dioxide
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/04 with stationary adsorbents B01D53/025 takes precedence
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01D 53/047 Pressure swing adsorption
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

A carbon dioxide recovery system is provided, in which, a filling rate of the carbon dioxide sorbent in the container indicated by f [%] is positive and larger than or equal to the value obtained by the following expression of 100×(p/(RT))×(x−C)/(a×(100+x/r−100×x/(rC)−x)+(p/(RT))×(x−C)), with respect to the effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent (=a) of the carbon dioxide sorbent to be used, wherein a demanded concentration of recovered carbon dioxide is indicated by x [%], and an amount of the captured gases other than carbon dioxide is indicated by r, and a concentration of dried carbon dioxide in a carbon dioxide-containing gas is indicated by C [%], and a total pressure of the carbon dioxide sorbent occurring when carbon dioxide is captured is indicated by p [Pa].

Claims

1. A carbon dioxide recovery system for recovering a high concentration of carbon dioxide from a carbon dioxide-containing gas, the carbon dioxide recovery system comprising:

a carbon dioxide sorbent;

a container that contains the carbon dioxide sorbent;

a channel that makes the carbon dioxide-containing gas flow into the container;

a channel that makes moisture vapor flow into the container;

a channel that discharges a gas from which carbon dioxide has been removed in the container;

a channel that discharges carbon dioxide captured in the container;

a shutoff valve provided in each of the channels; and

a measuring device that measures temperature at each of multiple points in the container, wherein

when an effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent, under an operating condition, is indicated by a [mol/L], a filling rate of the carbon dioxide sorbent in the container is indicated by f [%], a selective ratio of the captured carbon dioxide, a value which is obtained by dividing the effective molar quantity of the captured carbon dioxide (=a) by an amount of the captured gases other than carbon dioxide, which have been measured under the same temperature and partial pressure condition, is indicated by r [−

], a concentration of dried carbon dioxide in the carbon dioxide-containing gas is indicated by C [%], a demanded concentration of recovered carbon dioxide is indicated by x [%], a temperature of the carbon dioxide sorbent occurring when carbon dioxide is captured is indicated by T [K], a total pressure of the carbon dioxide sorbent occurring when carbon dioxide is captured is indicated by p [Pa], and the gas constant is indicated by R [Pa*L/(K*mol)], a carbon dioxide sorbent whose effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent (=a) is positive and is larger than or equal to the value obtained by the following expression of (100−

f)×

(p/(RT))×

(x−

C)/(f×

(100+x/r−

100×

x/(rC)−

x)), is used with respect to the filling rate f to be adopted.

2. The carbon dioxide recovery system according to claim 1, wherein

when the demanded concentration of the recovered carbon dioxide is made to be 90%, a carbon dioxide sorbent whose effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent (=a) is positive and is larger than or equal to the value obtained by the following expression of (100−

f)×

(p/(RT))×

(90−

C)/(f×

(10+90/r−

9000/(rC)), is used with respect to the filling rate f to be adopted.

3. The carbon dioxide recovery system according to claim 2, wherein

a carbon dioxide sorbent whose effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent (=a) is positive and is larger than or equal to the value obtained by the following expression of (100−

f)×

0.0377×

(90−

C)/(f×

(10+90/r−

9000/ (rC))) with respect to the filling rate f to be adopted.

4. The carbon dioxide recovery system according to claim 3, wherein

the carbon dioxide recovery system treats a carbon dioxide-containing gas whose concentration of carbon dioxide is within a range of 10 to 50% on a dry basis, and wherein

a carbon dioxide sorbent whose selective ratio of carbon dioxide (=r) is 10 or larger and whose effective molar quantity of the captured carbon dioxide per 1 L of the carbon dioxide sorbent (=a) is larger than or equal to the value obtained by the following expression of (100−

f)×

1.508/(f×

(10−

90/r), is used with respect to the filling rate f to be adopted.