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Guarantee Coal

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cfboiler

cfboiler

Mechanical
Joined
May 13, 2005
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5
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Dear All,

I would like to ask how to proceed with the performance tests on a coal power plant if the fuel quality is different from the contract? how do we create a correction for the thermal performance of the plant. Guarantee coal is different from the actual coal purchased (lower quality).
Thanks.
 
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This should have been addressed in the contract documents.

Proper documents should address guarantee conditions for a variety of "probable" coals that the plant may use.

A lot depends on the specific boiler guarantees that you are trying to meet..... is it heat rate ? emissions ?

You may have to bring in a third party and re-negotiate a new acceptable performance test.

MJCronin
Sr. Process Engineer
 
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Seconding MJCronin's comments.

As well as emissions and heat rate, you may need to look at a number of the off-spec coal's characteristics, such as its grindability, whether it be free-running, sintering, slagging, caking, etc; depending on these, you may encounter major operational problems if you attempt to fuel this plant with a coal other than with the type for which it was designed.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
 
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Hi! thanks for all the comments. just to be clear, our design coal envelope has this specific guarantee coal and beside that there is a range of coal quality (high and low values). Guarantee conditions states a list of parameters such as air temp, humidity, etc. including guarantee coal.
I want to know how to proceed if the coal that will be purchased is not the guarantee coal but is within the range of the coal design envelope.
 
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