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Flue gas desulphurisation

A gas and atmosphere technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of high implementation cost and insufficient removal.

Inactive Publication Date: 2012-08-15
SOUTH32 ALUMINUM RAA PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of red mud cannot sufficiently remove SO 2 , which is costly to implement due to the large amount of non-reactive material that is unnecessarily recycled through the system
This approach also results in undesired recycling of sulfite and sulfate anions back into the refinery stream

Method used

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  • Flue gas desulphurisation
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Embodiment Construction

[0022] Specific embodiments of the method and system of the present invention will be described with reference to the use of TCA6 filter aid for flue gas desulfurization in alumina refineries (just an example). The invention is equally applicable to the removal of sulfur oxides from other types of gases, including flue gases and flue gases from power stations or from any stationary fossil fuel combustion facility in an alumina refinery. The terms used herein are used to describe specific embodiments only, and do not limit the scope of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the drawings, it should be understood that like reference numerals refer to like parts.

[0023] The term "SO x "Refers to sulfur oxides, usually sulfur dioxide (SO 2 ) or sulfur trioxide (SO 3 ).

[0024] The term "TCA" refers to p...

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Abstract

A process for desulphurisation of a gas containing sulphur oxides (SOx) in a wet scrubbing unit is described. The process comprises the step of: contacting said gas with an aqueous tricalcium aluminate hexahydrate (TCA6) scrubbing slurry to remove SOx from the gas by reaction with TCA6 to form a spent scrubbing solution comprising a calcium compound containing sulphur and oxygen, and a aluminium compound containing oxygen and hydrogen.

Description

technical field [0001] The present invention relates to a method and a device for flue gas desulfurization, wherein sulfur oxides (SO x , usually SO 2 or SO 3 ). Background technique [0002] Aluminum is the second most used metal in the world. The annual global demand for alumina production is >70MT, and Australia currently accounts for >20MT / year. Extraction of alumina by the Bayer process is energy intensive, requiring electricity and steam, making most alumina refineries self-generating. Therefore, the alumina industry is a major source of greenhouse gas emissions, and in the case of coal or heavy fuel oil the alumina industry is SO x main source of emissions. SO can be taken before, after or during combustion x Emission Control Measures. SO after combustion x One example of an emission control measure is called "Flue Gas Desulfurization" (FGD). Using state-of-the-art methods, FGD is promoted through economically viable and readily available alkaline media...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50
CPCB01D53/502B01D2251/404
Inventor 史蒂文·菲利普·罗森贝格莱昂·穆恩罗朱中华
Owner SOUTH32 ALUMINUM RAA PTY LTD
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