Carbon dioxide recovery system and method

Patent metadata

Field	Value
Publication number	US-9233336-B2
Application number	US-201113338408-A
Country	US
Kind code	B2
Filing date	Dec 28, 2011
Priority date	Apr 6, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A carbon dioxide recovery system includes a high-pressure 11 , a boiler 15 , a carbon dioxide recovery unit 24 that includes a carbon dioxide absorber 21 that absorbs and reduces carbon dioxide in flue gas G emitted from the boiler 15 using a carbon dioxide absorbent and an absorbent regenerator 23 that regenerates a carbon dioxide absorbent having absorbed the carbon dioxide using a regenerating superheater 22 to obtain a regenerated carbon dioxide absorbent, a high-temperature and high-pressure steam extraction line L 11 that extracts the high-temperature and high-pressure steam 14 from the boiler 15 before the steam is introduced into the high-pressure turbine 11 , an auxiliary turbine 32 that recovers power with the high-temperature and high-pressure steam 14 , and a steam supply line L 12 that supplies emission steam 33 emitted from the auxiliary turbine 32 to the regenerating superheater 22 to be used as a heat source.

First claim

The invention claimed is:

1. A carbon dioxide recovery system comprising:
a boiler that generates high temperature and high-pressure steam;
a first high-temperature and high-pressure steam line and a second high-temperature and high-pressure steam line which are connected to the boiler and branch the high-temperature and high-pressure steam as a first high-temperature and high-pressure steam and a second high-temperature and high-pressure steam, respectively;
a high-pressure turbine that is connected to the first high-temperature and high-pressure steam line and driven by the first high-temperature and high-pressure steam;
an intermediate-pressure turbine driven by intermediate-pressure steam obtained by resuperheating in the boiler the first high-temperature and high-pressure steam emitted from the high-pressure turbine;
a low-pressure turbine driven by emission from the intermediate-pressure turbine;
a carbon dioxide recovery unit including
a carbon dioxide absorber having a carbon dioxide absorbent that absorbs and reduces carbon dioxide in flue gas emitted from the boiler, and
an absorbent regenerator having a regenerating superheater that regenerates the carbon dioxide absorbent having absorbed the carbon dioxide to obtain a regenerated carbon dioxide absorbent;

a high-pressure auxiliary turbine that is connected to the second high-temperature and high-pressure steam line, recovers power with the second high-temperature and high-pressure steam and emits emission steam;
a line that supplies the emission steam emitted from the high-pressure auxiliary turbine;
a low-pressure auxiliary turbine that is connected to the line that supplies the emission steam emitted from the high-pressure auxiliary turbine, recovers power with the emission steam emitted from the high-pressure auxiliary turbine; and
a steam supply line that supplies emission steam emitted from the low-pressure auxiliary turbine to the regenerating superheater of the carbon dioxide regenerator as a heat source;
wherein the boiler is provided on the line that supplies the emission steam emitted from the high-pressure auxiliary turbine, the emission steam emitted from the high-pressure auxiliary turbine is resuperheated by the boiler and the resuperheated emission steam is introduced into the low-pressure auxiliary turbine.

2. A carbon dioxide recovery method of recovering carbon dioxide absorbed in the carbon dioxide absorbent using the carbon dioxide recovery system according to claim 1 .

Assignees

• Iijima Masaki
• Mitsubishi Heavy Ind Ltd

Inventors

• Iijima Masaki

Classifications

• B01D53/62

  Carbon oxides · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• F23J2215/50

  Carbon dioxide · CPC title

• B01D2259/65

  Employing advanced heat integration, e.g. Pinch technology · CPC title

• F23J15/006

  Layout of treatment plant · CPC title