asabe 2014 presentation(final version)

S M Hassan Shahrukh, Dr. Amit Kumar

2014 ASABE and CSBE Annual International Meeting, 13-16 July ,2014

Development of Process Model for Assessment of Steam Treatment of Biomass for Pellet Production

Presentation at ASABE, 13-16 July,2014

Presentation Outline Background and Objective Pellet Production Supply Chain Model Development and Validation Mass and heat balance of Steam

Pretreatment Techno-Economic Result Summary of Result Future Work


Background


Objective


Pellet Supply Chain


Experimental Material and Method

Presentation at 29th ICSW, March 31, 2014

Model Development


Model Input

1. Boiler unit: Supply of steam at different time and temperature

2. Steam Pretreatment Unit: Biomass

is treated with high pressure steam in batch reactor ( Yield reactor

considered)

logR= logනexp(T− 10014.75 )dt Governing Equation:

Source: Lam et al. 2013


Simplified Model

Separated unit for steam pretreatment unit and

pelletizer unit since it is not a continuous process in the

experimental set up


Model Input 3. Pellet mill: produces pellet of 20-30 mm long , 6 mm in diameter, has

a heating element operating at 70-100 C.

2. Grinder: Kicks Energy constant 100KJ/kg, solid

recovery 95%

1. Dryer : Operating temperature at 80

C. rotary drum dryer flow rate of

10.4 t/h


Model Validation

Operation Experimental Energy Required MJ/Kg ASPEN model Energy Required MJ/Kg

Steam treated Untreated Steam treated Untreated

Steam Pretreatment 4.30 0.0 4.35 0.0

Drying 4.52 3.01 4.56 2.98

Size reduction 0.82 1.31 0.88 1.28

Pelletization 0.27 0.24 0.25 0.23

Total Energy Input 9.91 4.56 10.04 4.49

Total Energy Output 21.00 18.00 21.80 18.40

Energy Ratio 2.12 3.95 2.17 4.10


Steam Pretreatment representative mass and heat balance


Techno-Economic Snapshot

Steam Treated Pellet Untreated Pellet

Capacity (ton) 45000 45000

Total Energy (GJ) 990000 810000

Price of Pellet ($/ton) 231 207

Price of Pellet ($/GJ) 24.6 24.2


Cost Curve: Capital cost per ton

Steam Pretreatment increase capital cost due to addition of Steam Boiler

and Steam Pretreatment Unit

Steam Pretreated Pellet Regular pellet


Cost Curve: $/ton

No Point of Intersection in $/ton Curve


Cost Curve: $/GJ

Point of Intersection occurs at 270000 tons


Summary of Result


Future Work


Reference • Kumar A. (2009) “A conceptual comparison of bioenergy options for

using mountain pine beetle infested wood in western Canada.” Bioresource Technology,100 (1): 387-399.

• Lam, P. S.,Tooyserkani, Z., Naimi, L. J. and Sokhansanj, S. (2013) “Pretreatment and pelletization of woody biomass”, In Pretreatment Techniques for Biofuels and Biorefineries, Green Energy and Technology. Z. Fang, Editor. Springer-Verlag: Berlin Heidelberg, 93-116.

• Sarkar S. and Kumar A. (2009) “Techno-economic assessment of biohydrogen production from forest biomass in Western Canada.” Transactions of the ASABE, 52 (2): 1-12.

• Sultana. A., Kumar, A. and Harfield, D. (2010) “Development of agri-pellet production cost and optimum size”, Bioresource Technology 101: 5609-5621. Online at Science Direct.


Acknowledgement Bio Fuel Net

University of Alberta

Dr. Shahab Sokhansanj, Dr. Linoj Kumar and Bahman Ghiasi, Department of Chemical Engineering, University of British Columbia


Thank You/Questions

For further information:

Amit KumarNSERC/Cenovus/Alberta Innovates

Industrial Research Chair in Energy and Environmental Systems Engineering &

Cenvous Energy Endowed Chair in Environmental Engineering

E-mail: [email protected] Website: www.energysystems.ualberta.ca


mailto:[email protected]

http://www.energysystems.ualberta.ca/

asabe 2014 presentation(final version)

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