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A method for capturing carbon dioxide in flue gas

A carbon dioxide and flue gas technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of reduced absorption efficiency, easy damage to the hydrophobic layer, difficulty in equipment maintenance and large-scale equipment, and achieve durability and stability The effect of improving performance, overcoming poor temperature and pressure tolerance, and expanding the temperature and pressure range

Active Publication Date: 2021-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent 89107166 proposes a spirally arranged hollow fiber membrane module for gas membrane separation. The raw gas passes through the shell side of the membrane module, and the gas passing through the surface of the fiber membrane flows reversely through the tube side; patent 200820141700.2 and patent CN101653700 provide a A membrane module that relies on supergravity to enhance mass transfer. This design of fixing the absorbing element on the rotor has certain difficulties in equipment maintenance and device enlargement.
[0005] The existing membrane absorption technology basically uses a hydrophobic hollow fiber membrane as the absorption component, and uses the hydrophobicity of the hollow fiber membrane to selectively permeate the gas, while preventing the liquid from penetrating the surface of the membrane into the gas phase on the other side. Hollow fiber membranes are all organic membranes. The hydrophobicity is achieved by adding coatings and other surface modification measures. However, after long-term use, especially in solvents with certain lipophilicity, the hydrophobic layer is easily damaged. Liquid is entrained in the gas phase, and the absorption efficiency decreases, etc.

Method used

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  • A method for capturing carbon dioxide in flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The circulation rate of a certain solvent is 250kg / h, the raw material gas contains 15% carbon dioxide, and the raw material gas flow rate is 80Nm 3 / h, the maximum reaction temperature in the membrane module is 65°C, the carbon dioxide in the feed gas entering from the inlet (1) passes through the membrane surface of the non-hydrophobic ceramic membrane absorption module (5) and enters the absorbent solution, and is pumped by the centrifugal pump The negative pressure at the inlet (4) forms a micro-negative pressure circulation of the solvent in the membrane absorption module (5), and the purified flue gas exits the non-hydrophobic ceramic membrane module (5) from the gas phase outlet (2); the absorption after absorbing carbon dioxide The reagent solution is transported to the regeneration tower (8) by the centrifugal pump (7) through the outlet (6), and the regenerated lean solution is circulated back to the solution inlet (3) of the membrane module. The carbon dioxid...

Embodiment 2

[0018] The circulation rate of a certain solvent is 250kg / h, the raw material gas contains 15% carbon dioxide, and the raw material gas flow rate is 80Nm 3 / h, the maximum reaction temperature in the membrane module is 75°C, the carbon dioxide in the feed gas entering from the inlet (1) passes through the membrane surface of the non-hydrophobic ceramic membrane absorption module (5) and enters the absorbent solution, and is pumped by the centrifugal pump The negative pressure at the inlet (4) forms a micro-negative pressure circulation of the solvent in the membrane absorption module (5), and the purified flue gas exits the non-hydrophobic ceramic membrane module (5) from the gas phase outlet (2); the absorption after absorbing carbon dioxide The reagent solution is transported to the regeneration tower (8) by the centrifugal pump (7) through the outlet (6), and the regenerated lean solution is circulated back to the solution inlet (3) of the membrane module. The carbon dioxid...

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Abstract

The invention belongs to the technical field of carbon dioxide capture in gas, and relates to a process method for absorbing carbon dioxide from an amine solution on the membrane surface. A method for absorbing carbon dioxide in flue gas through gas-liquid contact using non-hydrophobic ceramic membranes as mass transfer equipment, characterized in that the carbon dioxide is captured by the negative pressure cycle of the absorbent between the membrane absorption module and the regeneration tower , used to replace hydrophobic hollow fiber membranes, the introduction of ceramic membranes overcomes the problems of hollow fiber membranes such as poor temperature and pressure tolerance, easy pollution, and decreased hydrophobic performance, greatly expanding the range of temperature and pressure absorbed by the membrane, and the durability and stability of the equipment Sex is also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide capture in gas, and relates to a process method for absorbing carbon dioxide from an amine solution on the membrane surface. Background technique [0002] CO 2 A large amount of emissions have led to global warming, exacerbated the greenhouse effect, and frequent extreme weather. Countries around the world are paying more and more attention to the control of carbon dioxide emissions. With the signing of the "Kyoto Protocol" and the convening of the Copenhagen Global Climate Summit, countries around the world have paid more attention to the research and development and industrialization of carbon dioxide emission reduction technologies. CO emissions from fossil fuel combustion 2 Accounting for about 80% of the total emissions, among which the flue gas of fossil fuel power plants is CO 2 Long-term stable and concentrated emission sources, the CO emitted by them 2 30% of total emissions. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/22B01D53/14C01B32/50
CPCB01D53/1425B01D53/1443B01D53/1475B01D53/1493B01D53/228B01D53/229Y02P20/151Y02C20/40
Inventor 毛松柏彭文博李海涛汪东
Owner CHINA PETROLEUM & CHEM CORP