Feed Handling

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Feed transport

This unit operation allows assigning a transport cost to the biomass depending on distance. In the base case, this cost is set to $0.12/km-ton for variable cost and $4.39/ton for fixed cost (1). The prices in 2004$ are adjusted to 2009$.

Need for review: medium.

Need for innovation: high.

Conveyor belt (C-101)

Power consumption was assumed to be from a 40 kW (~50HP) motor.

Need for review: low.

Need for innovation: low.

Washing table (G-102)

Recycled water is used to wash the table. About 30% of all liquid components are carried forward with the main stream. The rest exits with the washing water, which is recycled.

Need for review: medium.

Need for innovation: low.

Conveyor belt (C-103)

Power consumption was assumed to be from a 40 kW (~50HP) motor.

Need for review: low.

Need for innovation: low.

Shredder (S-104)

Power consumption was obtained from vendor websites. Jamesway Farm Equipment calculates that for grinding dry corn to powdery particle size (1/4"), the specific power is about 0.002 kW/(kg/hr). The specific power for fibrous biomass was assumed to be five-fold higher, based on specifications from Adare Green Energy.

Need for review: medium.

Need for innovation: low.

Clarifier tank (CT-105)

Solids from biomass are precipitated with a polymer base, which settle and are disposed. It is assumed that all the polymer exits at the bottom of the tank. The clarifier tank is priced in a separate unit ($-CT-105), based on fluid flow.

Need for review: medium.

Need for innovation: low.

Storage tank (ST-106)

This unit serves as a buffer tank for the washing water. Process water is pumped to this tank to make up losses in the clarifier and washing. A residence time of 5 hours is assumed.

Need for review: medium.

Need for innovation: low.