Guarantee Coal

[cfboiler]

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.

 

[MJCronin]

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

 

[crshears]

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]

 

[cfboiler]

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.