mass_balance.pdf | |
File Size: | 313 kb |
File Type: |
MASS BALANCE FOR PYROLYSIS OF BIOMASS
mass balance equation
{Rate of Accumulation} = {Rate of Mass Flow In} – {Rate of Mass Flow Out}
where = mass flow rate of Biomass Feed in kg/hr
= mass flow rate of BioChar Product in kg/hr
= mass flow rate of Bio-Oil Product in kg/hr
= mass flow rate of Non-Condensable Gas in kg/hr
= mass flow rate of Unconverted Biomass in kg/hr
Brown (2009) states that the primary product from fast pyrolysis is the pyrolysis oil which is also known as bio-oil. Its amount is ranged from 65%-wt to 75%-wt. The other products are BioChar and Non-Condensable Gas which are approximately 11%-wt to around 25%-wt and 10%-wt to 20%-wt respectively. The total biomass conversion is about 90% which means 10% biomass is unconverted.
In the technology proposed, the main component from fast pyrolysis we desire is the Bio-Oil which is a complex mixture consisting of 300 organic compounds. The major constituents of bio-oil include aldehyde (15%-wt), carboxylic acids(12%-wt), carbohydrates(8%-wt),phenols(3%-wt), furfurals (2%-wt) and ketones(3%-wt) (Brown, 2009). These are the major and basic compositions of Bio-Oil.
*Non-Condensable Gas is also known as Permanent Gas.*
Average percentage – Bio-Oil : 70%-wt
BioChar : 18%-wt
Non-Condensable Gas : 12%-wt
= mass flow rate of BioChar Product in kg/hr
= mass flow rate of Bio-Oil Product in kg/hr
= mass flow rate of Non-Condensable Gas in kg/hr
= mass flow rate of Unconverted Biomass in kg/hr
Brown (2009) states that the primary product from fast pyrolysis is the pyrolysis oil which is also known as bio-oil. Its amount is ranged from 65%-wt to 75%-wt. The other products are BioChar and Non-Condensable Gas which are approximately 11%-wt to around 25%-wt and 10%-wt to 20%-wt respectively. The total biomass conversion is about 90% which means 10% biomass is unconverted.
In the technology proposed, the main component from fast pyrolysis we desire is the Bio-Oil which is a complex mixture consisting of 300 organic compounds. The major constituents of bio-oil include aldehyde (15%-wt), carboxylic acids(12%-wt), carbohydrates(8%-wt),phenols(3%-wt), furfurals (2%-wt) and ketones(3%-wt) (Brown, 2009). These are the major and basic compositions of Bio-Oil.
*Non-Condensable Gas is also known as Permanent Gas.*
Average percentage – Bio-Oil : 70%-wt
BioChar : 18%-wt
Non-Condensable Gas : 12%-wt
mass balance calculations
It is known that the feed mass flow rate is 100kg/hr, hence
Brown (2009) points out that for lab-scale biomass fast pyrolysis process, the biomass is fed at a rate around 0.5kg/hr to 2.0kg/hr, into the fluidised bed reactor.
Reference
Brown,J.N. (2009). Development of a lab-scale auger reactor for biomass fast pyrolysis and process
optimization using response surface methodology. Digital Repository@Iowa State University : Graduate Theses and Dissertations. Paper 10996.
optimization using response surface methodology. Digital Repository@Iowa State University : Graduate Theses and Dissertations. Paper 10996.