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CO2 capture system by chemical absorption

a capture system and chemical absorption technology, applied in liquid degasification, separation processes, dispersed particle separation, etc., can solve the problems of not being able to propose specific techniques to reduce energy and reduce and reuse waste heat, and achieve the effects of reducing cooling exhaust heat, increasing energy efficiency of the system, and reducing recovery energy inpu

Inactive Publication Date: 2014-11-25
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]To increase energy efficiency of the CO2 capture system by chemical absorption including the reduction of recovery energy, it is necessary to reduce input energy as well as reducing and reusing waste heat. However, with regard to the CO2 capture system by chemical absorption described in each of the cited patent literatures, nothing is proposed about specific techniques to reduce energy and reduce and reuse waste heat.
[0016]An object of the present invention is to provide a CO2 capture system by chemical absorption capable of increasing energy efficiency of the system by reducing recovery energy inputted into the regenerator as well as reducing cooling exhaust heat resulting from exhaust gas cooling.
[0020]According to the present invention, it is possible to provide a CO2 capture system by chemical absorption capable of increasing energy efficiency of the system by reducing recovery energy inputted into the regenerator as well as reducing cooling exhaust heat resulting from exhaust gas cooling.

Problems solved by technology

However, with regard to the CO2 capture system by chemical absorption described in each of the cited patent literatures, nothing is proposed about specific techniques to reduce energy and reduce and reuse waste heat.

Method used

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Examples

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embodiment 1

[0027]A first embodiment of the CO2 capture system by chemical absorption according to the present invention will be described with reference to FIG. 1. In FIG. 1, an example will be described in which the outlet gas heat of the regenerator of the CO2 capture system by chemical absorption is recovered and reused for an inlet rich solvent of the regenerator.

[0028]FIG. 1 shows the system configuration of the regenerator and peripheral devices of the CO2 capture system by chemical absorption according to the first embodiment of the present invention.

[0029]The CO2 capture system by chemical absorption according to this embodiment comprises an absorber 1 for removing CO2 contained in exhaust gas by absorbing CO2 by a solvent, and a regenerator 2 for separating CO2 from the solvent that has absorbed CO2 and regenerating the solvent, wherein the solvent is circulated between the absorber 1 and the regenerator 2.

[0030]To explain the CO2 capture system by chemical absorption according to thi...

embodiment 2

[0051]Next, a second embodiment of the CO2 capture system by chemical absorption according to the present invention will be described with reference to FIG. 2.

[0052]Basic configuration of the CO2 capture system by chemical absorption according to this embodiment shown in FIG. 2 is the same as that of the CO2 capture system by chemical absorption according to the first embodiment shown in FIG. 1. Therefore, description of the configuration common to both systems is omitted and only different parts will be described below.

[0053]FIG. 2 shows an example of the CO2 capture system by chemical absorption that combines the configuration of the CO2 capture system by chemical absorption according to the first embodiment with the VR technique.

[0054]In the CO2 capture system by chemical absorption shown in FIG. 2, the rich solvent 5 that has absorbed CO2 contained in the exhaust gas in the absorber 1 is heated, through the liquid heat exchanger 12 installed along the path of the rich solvent su...

embodiment 3

[0070]Next, a third embodiment of the CO2 capture system by chemical absorption according to the present invention will be described with reference to FIG. 4.

[0071]Basic configuration of the CO2 capture system by chemical absorption according to this embodiment shown in FIG. 4 is the same as that of the CO2 capture system by chemical absorption according to the first embodiment shown in FIG. 1. Therefore, description of the configuration common to both systems is omitted and only different parts will be described below.

[0072]FIG. 4 shows an example of the CO2 capture system by chemical absorption that combines the configuration of the CO2 capture system by chemical absorption according to the first embodiment with the decompression operating method of the reboiler.

[0073]In the CO2 capture system by chemical absorption shown in FIG. 4, pressure of the reboiler 7 is decompressed to become lower than the pressure, 0.15 to 0.2 MPa, of the regenerator and operated. The lean solvent 8 fro...

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Abstract

The CO2 capture system by chemical absorption for removing CO2 from a combustion exhaust gas by a solvent, comprising: an absorber for absorbing CO2 by a solvent, a regenerator for heating a rich solvent absorbed CO2 thereby releasing CO2, a gas exhaust system for discharging gas from the regenerator, a gas compressor installed in the gas exhaust system, a heat exchanger disposed downstream of the gas compressor for exchanging heat between compressed gas and rich solvent to be supplied to the regenerator, a gas-liquid separator disposed downstream of the heat exchanger for separating gas from condensed water, a condensed water supply system for supplying condensed water from the gas-liquid separator to the regenerator, another gas exhaust system for discharging gas containing high-concentration CO2 from the gas-liquid separator, and a compressor disposed downstream of the gas-liquid separator in the another gas exhaust system for pressurizing the gas containing high-concentration CO2.

Description

CLAIM OF PRIORITY[0001]The present application claims priority from Japanese patent application JP 2012-000960 filed on Jan. 6, 2012, the content of which is hereby incorporated by reference into this application.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present inventions relates to a CO2 capture system by chemical absorption that recovers CO2 from combustion exhaust gas, and in particular, to a CO2 capture system by chemical absorption that reduces energy loss of the CO2 capture system.[0004]2. Background Art[0005]To reduce emission of carbon dioxide (CO2) which causes global warming, technologies for removing CO2 from exhaust gas discharged from plants where fossil fuels are burnt have been being developed. One of those technologies is a CO2 capture system by chemical absorption which recovers CO2 from gas by means of an alkaline solvent.[0006]Basic mechanism of the CO2 capture system by chemical absorption is described in, for example, Japanese Patent Laid-Ope...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B01D53/14B01D47/00B01D19/00B01D53/62
CPCB01D53/62B01D53/1425Y02C10/04B01D2258/0283Y02C10/06B10D53/1475
Inventor HOKARI, NOBUYUKIORITA, HISAYUKIMUKAIDE, MASAAKISHIMAMURA, JUNYOKOYAMA, KOUICHIYOSHIDA, NORIKO
Owner MITSUBISHI HITACHIPOWER SYST LTD