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Method for burning coal using oxygen in a recycled flue gas stream for carbon dioxide capture  US8505496
US8505496

Method for burning coal using oxygen in a recycled flue gas stream for carbon dioxide capture 

Historically, pulverized coal furnaces are not favourable to the formation of  slag, containing coal ash, due to the combustion conditions and temperatures. As such the ash and solid combustion products are particulate and the furnace is referred to as dry bottom.  These furnaces, split intake air into three streams, where each stream passes through a heat exchanger that is heated by exhaust combustion gases.  A primary air stream is fed through a coal pulverizer to dry the coal prior to feeding it to the burner.  A secondary air stream is provided annularly to the primary.  A tertiary air stream is provided annually to the second.  This latter stream may also be fed to an over-fire system that is separate from the burner.  The gas in each stream is the same.

In the instant technology, combustion gas is fed to a first heat exchanger where it is cooled, allowing water vapour to condense and particulate is removed.  This gas is said to have approximately 6% oxygen.  It is again fed to the burner in three streams. The primary stream is again fed to a pulverizer and an air-fuel mixture is provided to the burner.  A second stream is annularly provided around the primary, where it has swirl inducing elements.  A tertiary air stream is provided to the burners annularly to the second.  All three streams pass through a second heat exchanger to pre-heat.  

Ambient air is provided to a separation plant and a gas that is approximately 90% oxygen is produced.  This gas is provided to the tertiary stream and over-fire system.  It is also provided to jets that are peripheral to the tertiary stream, where the jets are at an angle, directing the high oxygen content gas inward toward a central axis of the primary stream.  Further, these jets provide “swirl” to the gases in the combustion zone.  It is said that the system provides improved oxygen management and flame.control.  It also mitigates early combustion of the fuel as it is provided in a low oxygen concentration stream.

Applicant(s):

Canada Minister of Natural Resources

 

Filing Date:

2007-May-18 (CA)

 

Inventor(s):

Douglas, Mark Austin

Tan, Yewen

Sellers, Thomas

Chui, Eddy

Majeski, Adrian

ExploreIP

Google Patents

 

Other patents by lead inventor (select):

N/A

Independent Claims (Applied for):

1 – Method

10 – Apparatus

Analyst Comments:

 

The instant technology was developed around the combustion of coal.  Namely, there was a desire to improve combustion such that slag is provided, instead of a so-called dry bottom.  At initial reading. the independent Claims do not refer to coal.  Further, due diligence would be warranted in this regard.   

Coming Soon … A patented technology is often directed a solving one problem.  However, the technology may be applicable to other fields.  There are  many examples of a technology jumping fields.  So, it never hurts to look.  We will look within the IPmart system, leveraging the Framework to tie fields together.  There are too many ideas to write here!

Coming Soon … This is where we will look for technology from similar or related fields. We ask what are complimentary & competitive technologies?  These might include technologies approaching the same problem or technologies that build on the advances of the instant technology.

Technology Tree

Where am I?  A combustion system is presented, where the system considers the oxygen content of the provided gas and details of how it is delivered. 

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