System for collecting carbon dioxide in flue gas

• US 9,341,101 B2
• Filed: 12/02/2013
• Issued: 05/17/2016
• Est. Priority Date: 07/08/2008
• Status: Expired due to Fees

• Current Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Kansai Electric Power Company Incorporated, Mitsubishi Heavy Industries, Ltd.
• Inventors: Iijima, Masaki, Kamijo, Takashi, Yagi, Yasuyuki, Ogura, Kouki
• Primary Examiner(s): Sasaki, Shogo
• Application Number:
  US14/094,197
• Publication Number:
  US 20140086799A1
• Time in Patent Office: 897 Days
• US Class Current: 1/1
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/1412 Controlling the absorption process
• CPC Class Codes: B01D 53/346 Controlling the process
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: F01N 3/20 specially adapted for catalytic conversion F01N3/22 takes precedence; Methods of operation or control of catalytic converters
• CPC Class Codes: F01N 3/2882 Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices combined with absorbents or adsorbents only F01N3/0814; combined with particulate filters F01N3/035
• CPC Class Codes: F23J 15/006 Layout of treatment plant
• CPC Class Codes: F23J 15/02 of purifiers, e.g. for removing noxious material traps for solid residues F23J3/04
• CPC Class Codes: F23J 2215/50 Carbon dioxide
• CPC Class Codes: F23J 2900/15061 Deep cooling or freezing of flue gas rich of CO2 to deliver CO2-free emissions, or to deliver liquid CO2
• CPC Class Codes: F23L 11/00 Arrangements of valves or dampers after the fire
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02E 20/32 Direct CO2 mitigation
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

A system for collecting carbon dioxide in flue gas includes a stack that discharges flue gas discharged from an industrial facility to outside, a blower that is installed at the downstream side of the stack and draws the flue gas therein, a carbon-dioxide collecting device that collects carbon dioxide in the flue gas drawn in by the blower, and a gas flow sensor arranged near an exit side within the stack. A drawing amount of the flue gas by the blower to the carbon-dioxide collecting device is increased until an flow rate of the flue gas from the stack becomes zero in the gas flow sensor, and when the discharged amount of flue gas from the stack becomes zero, drawing in any more than that amount is stopped, and the carbon dioxide in the flue gas is collected while the flue gas is drawn in by a substantially constant amount.

Claims

1. A system for collecting carbon dioxide in flue gas, comprising:

a stack that has an entrance and an exit of the flue gas, the exit being arranged at a top of the stack, and the entrance being arranged at a lower portion of the stack and, connected to an industrial facility through a stack flue for taking in the flue gas to be discharged to outside from the exit;

a carbon-dioxide collecting device that is connected to the lower portion of the stack through a flue gas passage and collects carbon dioxide in the flue gas;

a blower that is installed in the flue gas passage between the stack and the carbon-dioxide collecting device to draw in the flue gas to the carbon-dioxide collecting device;

a plurality of sensors configured to measure gas concentration, the gas concentration being one of oxygen concentration of the flue gas and carbon dioxide concentration of the flue gas, one of the plurality of sensors being arranged in the stack flue and another one of the plurality of sensors being arranged in the flue gas passage between the stack and the blower; and

a controller connected to the blower and the plurality of sensors, the controller receiving signals corresponding to the gas concentration from the plurality of sensors, wherein

the controller is configured to control the blower to increase a drawing amount of the flue gas to the carbon-dioxide collecting device until a difference between measured values of the one of the plurality of sensors and the another one of the plurality of sensors in the gas concentration is generated due to atmosphere flowing into the stack from the exit of the flue gas, and

the controller is configured to stop drawing in any more than the amount immediately before the difference between the measured values of the one of the plurality of sensors and another one of the plurality of sensors in the gas concentration is generated, and to control the blower to draw in the flue gas by a substantially constant amount.