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Process for treating coal with a magnetic gradient to reduce sulfur dioxide emissions

a technology of magnetic gradient and sulfur dioxide, which is applied in the direction of solid fuels, petroleum industry, fuels, etc., can solve the problems of affecting the environment, particularly troublesome impurities such as sulfur, and achieve the effects of reducing the sulfur dioxide content of the emission, increasing the amount of calcium sulfate produced, and producing energy

Inactive Publication Date: 2006-03-30
FARONE WILLIAM A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] A further aspect of this invention is a process for increasing the amount of calcium sulfate produced as a result of burning high sulfur coal, while at the same time reducing the sulfur dioxide emissions from such burning, which includes burning a vacuum-fractured high sulfur coal having calcium salts deposited within fractures in the coal and recovering the calcium sulfate produced as a result of such burning.

Problems solved by technology

A particularly troublesome impurity is sulfur.
Acid rain can damage the environment in a variety of ways, and in the United States, the Environment Protection Agency (EPA) has set standards for burning coal that restricts SO2 emissions from coal-fired plants.

Method used

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  • Process for treating coal with a magnetic gradient to reduce sulfur dioxide emissions
  • Process for treating coal with a magnetic gradient to reduce sulfur dioxide emissions
  • Process for treating coal with a magnetic gradient to reduce sulfur dioxide emissions

Examples

Experimental program
Comparison scheme
Effect test

example i

Slurry Version

[0073] This example describes a process for carrying out the process for treating coal prior to burning.

[0074] 20 lbs. of ground coal are placed in a 5-gal. airtight container.

[0075] An aqueous basic solution with a pH of 13.5 is added into the container. The aqueous solution comprises a saturated calcium carbonate with sodium hydroxide. The aqueous solution is added in an amount sufficient to cover the coal.

[0076] Carbon dioxide gas is added to the airtight container. If the pore space in the coal and spaces between the coal in the container is 40% of the volume of the container and the temperature is 70° F., then 5.5 ft3 of CO2 or 0.7 lbs. is needed. The gas is pressurized up to 300 psi. The container is then pressurized for 20 minutes.

[0077] The carbon dioxide is then flashed off reducing the pressure from 300 psi to about 1 atm (14.7 psi).

[0078] The resultant material is then passed through a magnetic field gradient.

[0079] The magnetic field gradient is eith...

example ii

Dry Version

[0080] This example describes another process for treating coal prior to burning.

[0081] 20 lbs. of ground coal are placed in a 5-gal. container.

[0082] An aqueous basic solution with a pH of 13.5 is added into the container. The aqueous solution comprises a saturated calcium carbonate with sodium hydroxide. The aqueous solution is added in an amount sufficient to cover the coal.

[0083] Carbon dioxide gas is added to the airtight container. Preferably, 5.5 ft3 of CO2 or 0.7 lbs. is used. The gas is pressurized up to 300 psi. The container is then pressurized for 20 min.

[0084] The carbon dioxide is then flashed off reducing the pressure from 300 psi to about 1 atm (14.7 psi).

[0085] The resultant material is then dried until the material has less than 3 wt % aqueous solution.

[0086] The fractured coal is then passed through a magnetic field gradient.

[0087] The magnetic field gradient is either at least one magnetic field gradient or a plurality of magnetic field gradien...

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Abstract

A process for treating high sulfur coal to reduce sulfur dioxide emissions when the coal is burned, which includes placing the coal in an aqueous basic soluble media saturated with a calcium salt which is pressurized with carbon dioxide. The pressure is then released to fracture the coal, and the aqueous fluids are substantially removed from the fractured coal by drying. A magnetic field is applied to the fractured coal to orient the calcium ions and to distribute the ions more uniformly on the fractured coal. The distributed calcium produces calcium sulfate when the coal is burned.

Description

[0001] This application claims the benefit of U.S. Provisional Application No. 60 / 613,625, filed Sep. 27, 2004.FIELD OF THE INVENTION [0002] The present embodiments relate generally to the treatment of coal to reduce emissions of sulfur dioxide from the coal combustion process. The present invention is directed towards a novel treatment of coal which reduces the sulfur dioxide emissions from the coal combustion process. BACKGROUND OF THE INVENTION [0003] The following description of the background of the invention is provided to aid in understanding the invention, but is not admitted to be, or to describe, prior art to the invention. All publications are incorporated by reference in their entirety. [0004] Coal is one of the most bountiful sources of fuel in the world. Coal is typically found as dark brown to black graphite-like material that is formed from fossilized plant matter. [0005] Coal generally comprises amorphous carbon combined with some organic and inorganic compounds. Th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L5/00
CPCC10L9/10C10L9/02
Inventor FARONE, WILLIAM A.
Owner FARONE WILLIAM A
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