Combustion Calculations - Boilers Biomass
Combustion Calculations - Boilers Biomass
(OP)
Hi,
I would like to do a combustion calculation from first principles to determine % by volume of Carbon Dioxide and Oxygen in the flue gas (Exhaust gas) of biomass power station boilers.
The following is the breakdown of Pine (as received around 30% moisture content)
Carbon 36%
Hydrogen 4%
Oxygen 30%
Nitrogen 0%
Sulphur 0%
Moisture 30%
For a biomass fired boiler on a fixed grate I can work on 120% excess air (as opposed to around 40% for coal and 25% for oil).
Unrelated useful info is that for the above fuel the Net average calorific value is around 11.75 MJ/kg (if it was completely dry and had no ash the Net calorific value would increase to 18.31 MJ/kg).
I would also like you to research the difference between the following:
1. Net calorific value and gross calorific value
2. Net boiler efficiency and gross boiler efficiency
How do I calculate the Net and gross boiler efficiency?
Could someone please point me in a direction??
I would like to do a combustion calculation from first principles to determine % by volume of Carbon Dioxide and Oxygen in the flue gas (Exhaust gas) of biomass power station boilers.
The following is the breakdown of Pine (as received around 30% moisture content)
Carbon 36%
Hydrogen 4%
Oxygen 30%
Nitrogen 0%
Sulphur 0%
Moisture 30%
For a biomass fired boiler on a fixed grate I can work on 120% excess air (as opposed to around 40% for coal and 25% for oil).
Unrelated useful info is that for the above fuel the Net average calorific value is around 11.75 MJ/kg (if it was completely dry and had no ash the Net calorific value would increase to 18.31 MJ/kg).
I would also like you to research the difference between the following:
1. Net calorific value and gross calorific value
2. Net boiler efficiency and gross boiler efficiency
How do I calculate the Net and gross boiler efficiency?
Could someone please point me in a direction??





RE: Combustion Calculations - Boilers Biomass
I'm not sure how I'd say it's meant for biomass fuels but the same theories can be applied.
RE: Combustion Calculations - Boilers Biomass
RE: Combustion Calculations - Boilers Biomass
HANDBOOK OF HEAT AND MASS TRANSFER Vol 1, Editor: Nicholas P. Cheremisinoff (Gulf Publishing Co.)
RE: Combustion Calculations - Boilers Biomass
Here is a URL for a free spreadsheet that deals with basic combustion calculations:
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Thanks,
Gordan
http://www.engineering-4e.com