Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

2

Combustion Analysis Problem

combustion mass balance chemical reaction

3 replies to this topic
Share this topic:
| More

#1 RPD

RPD

    Brand New Member

  • Members
  • 1 posts

Posted 14 September 2019 - 03:54 PM

Hello, I am currently stuck on a combustion analysis problem. The answer wanted is the composition of each stream. I have done it by setting up a table and using my combustion equations and assigning a variable to each equation. Somewhere I am making a mistake as when I solve all my equations I keep getting a negative kmol out for CO.

 

The coal contains 4.41% bound moisture

 

The question is attached. Any help will be much appreciated. My basis used is 100 kg coal in. 

 

Thanks in advance 

 

Adding on, sorry about how messy my work is. I hope it makes sense. I decided to first work out how much carbon actually combusted. I then wrote up all my combustion equations giving each a variable and using stoichiometric ratios. 

 

The gen 1 stands for generated in reaction 1 and con 1 stands for consumed in reaction 1. 

 

there is no extra information about the percentages and the CO2 relative to CO. No O2 is said to leave at the flue gas. 

 

According to my working there is negative kmol CO leaving which is obviously wrong.

Attached Files


Edited by RPD, 15 September 2019 - 03:53 PM.


#2 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,776 posts

Posted 14 September 2019 - 06:15 PM

We can't help you without seeing your work.

 

Bobby



#3 breizh

breizh

    Gold Member

  • ChE Plus Subscriber
  • 4,351 posts

Posted 15 September 2019 - 03:10 AM

Hi ,

is your Problem statement complete ? no clue about CO2 or CO?

What about the % , no indication about mass or Mo l ?

 

We are not doing home work but we will support you if you explain to us your difficulties and show your  work.

Good luck.

Breizh



#4 breizh

breizh

    Gold Member

  • ChE Plus Subscriber
  • 4,351 posts

Posted 15 September 2019 - 07:54 PM

Hi ,

Your documents are difficult to follow :

You should start with a PFD ( identify all the equipment) , label all the streams in and out .

Consider also to issue a Excel table to perform your calculation

list all the components

Use the analysis on hands and explain what you are getting from them .

write down all the possible reactions taking place .

 

note : about bound Moisture , this will be released during the calcination of the coal . This water will be combined with the water from the air and released in the flue gas.

Make sure you understand the meaning of volatile in Coal with the respective components..

 

 

If you follow this methodology everyone will understand your work .

Hope this is helping you .

Good luck

Breizh


Edited by breizh, 16 September 2019 - 01:24 AM.





Similar Topics