Air pollution control

A technology for controlling air and combustion exhaust gas, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as removal

Inactive Publication Date: 2007-05-09
SOLUCORP INDS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention solves the problem of removing such pollutants from combustion exhaust gases by providing an improved method for removing pollutants such as mercury and other heavy metals

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Embodiment Construction

[0011] According to a first aspect of the invention, a method of controlling air pollution comprises contacting combustion exhaust gases with a mixture of alkaline earth metal sulphides and a buffer. Preferred buffers are selected from phosphoric acid, phosphate salts, alkaline earth metal based pH buffers, and mixtures thereof. Alkaline earth metal sulfides and buffers (sometimes collectively referred to as remedial agents) can be introduced into the combustion exhaust in aerosol form to react with and facilitate removal of mercury and / or other heavy metals in the combustion gases.

[0012] Non-limiting examples of alkaline earth metal sulfides include calcium sulfide, magnesium sulfide, calcium sulfide adducts, magnesium sulfide adducts, mixed calcium-magnesium sulfides, and mixtures thereof.

[0013] Non-limiting examples of alkaline earth metal-based pH buffers include calcium carbonate, calcium hydroxide, calcium phosphate, magnesium carbonate, magnesium hydroxide, magnes...

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Abstract

In a method of controlling air pollution, a combustion gas is passed through a slurry of an alkaline-earth metal sulfide and a redox buffer (e.g., a phosphate), preferably in combination with an alkaline-earth metal carbonate and/or hydroxide. A composition for removing a heavy metal from a combustion gas is also provided, as an aerosolized, aqueous dispersion or slurry of an alkaline-earth metal sulfide and a buffering agent. A solid residue of the air pollution control process is also described.

Description

technical field [0001] Generally, the present invention relates to air pollution control technology, and in particular, the present invention relates to technology for reducing mercury and other pollutants in combustion exhaust gas. Background technique [0002] Combustion exhaust gases from incineration, power plants, and coal-fired furnaces often contain oxides of sulfur (SOx), oxides of nitrogen (NOx), and volatile heavy metals such as mercury. Generally, the mercury content in coal is 0.05-0.25 mg / kg. Mercury is volatilized during combustion and carried in combustion exhaust gas. [0003] Mercury can cause serious problems for human health and the environment. MSNBC.com recently reported that the Southeast United States alone could save as much as $2 billion a year by reducing mercury pollution. Coal-fired power plants are the largest source of mercury emissions, accounting for 40% of total emissions, and coal-fired furnaces account for 10% of total emissions. [000...

Claims

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Application Information

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IPC IPC(8): B01D53/06B01D53/64
Inventor P·J·赫尔利
Owner SOLUCORP INDS
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