REVTECH Roasting Technology - asew-expo.com. Mr. Sebastien Muller_REVTEC… · REVTECH Torrefaction...

REVTECH Torrefaction Technologyfor all kind of biomass (wood, fruit pip, cereal waste…)

Outlines

• Torrefaction of biomass, why ?

• The REVE technology

• Application for biomass torrefaction

– Wood chips

– Fruit pips

– Other type

• Conclusion: the main advantages

Torrefaction : the origins

• Biomass – important potential of advanced fuels

– Great availability, wide range of possibilities

– Available at low cost

– Sustainable and environmentally friendly

• The challenges:

– Make the biomass more uniform

– Densify the energy (reduce transport costs)

– Make it easier to store (no deterioration even in tropical climate)

• How ?

Pelletizing / Torrefaction

Pelletization: biomass densification

(Nielsen et al., 2009, Wood and Fiber Science 41 (4): 414-425)

transport cost and handling

Today : the only solid biofuel with a global market

Biomass densification :0.2-0.3 g/cm3 to 0.65-0.75 g/cm3

(Shang et al., 2012, Fuel Processing Technology 101: 23-28)

(Tumuluru et al., 2011, Biofuels Bioprod. Biorefinering 5: 683-707)

But:

(Peng et al., 2013, Fuel)

Moisture uptake

long storage and transport

grinding cost

Fine particles needed

Pelletization: biomass densification

(Nielsen et al., 2009, Wood and Fiber Science 41 (4): 414-425)

transport cost and handling

Today : the only solid biofuel with a global market

Biomass densification :0.2-0.3 g/cm3 to 0.65-0.75 g/cm3

(Shang et al., 2012, Fuel Processing Technology 101: 23-28)

(Tumuluru et al., 2011, Biofuels Bioprod. Biorefinering 5: 683-707)

But:

Moisture uptake

long storage and transport

grinding cost

Fine particles needed

Torrefaction

Heat the product to 200-300°C for 10 – 60mn

In low O2 environment

Torrefaction : Why ? How ?

« Status overview of torrefaction technologies » IEA Bioenergy Task 32 Report, December 2012:

The challenges of torrefaction:

• Only a few technologies can handle a large spectrum of particle sizes

• High quantity of gas to be treated (heat carrying medium)

• Screw reactors, drum reactors or belt conveyors: limited scaleabilitymultiple production lines

(Stelte et al., 2013, Biomass and Bioenergy 49: 214-221)

Pelletization of torrefied strawCombination of torrefaction and pelletization :

High density Water-resistant

Solid biofuel:

Post- or pre-torrefaction ?

Feedstock, grinding cost, … Existing plant or not ?

Torrefaction degree?

Revtech Heat Treatment Technology

• Principle of operation

• Experience in food industry

• Scale up possibilities

The Company

• Created in 1997.

• Basis : Vibrating Electrical Heated Tube.

• Design and fabrication of equipment for continuous heat treatment devices of bulk solids in food, pharmaceutical and chemical industry.

• Installation and commissioning of complete customized industrial units in the customers plant:

Tailor – made & turn – key project.

• Pasteurization of herbs & spices

• Pasteurization & Roasting of nuts

• Heat treatment of grain products

• Heat treatment for chemical industry, environment…

Main domains of activity

How does it work?

Continuous Process

Combinations of 3 simple principles:

• Transportation / Mixing by vibrations

• Heating by direct contact with a hot surface

• Treatment in a confined atmosphere

Principle of operation

In terms of process:(from the product point of view)

40 to 180 m long

3’’ to 10’’

T from 50 to 400°C

Main parameters

• Flowrate: 100 kg/h to 5 ton/h

• Temperature: 50 to 400°C

• Residence time: 1 to 40 mn

• Atmosphere: air, steam, nitrogen…

Electrical current Optional injection of gas (steam, N2,…)

Hot Product

Treated Productat ambient

temperature

Raw Product

Cooler

Tube at 80 to 300°C

for 5 to 20 mn


1. Transport / Mixing: in ss tube vibrated by off balanced motors


Off balanced motors

1. Transport / Mixing: in ss tube vibrated by off balanced motors


• Frequency: ~ 12 Hz• Amplitude: ~ 4 mm• Acceleration: ~ 4 g

2. Heating of the product: by direct contact with hot ss pipe which is

heated by electricity using Joule effect (High impedance tube)

• High current

• Low voltage < 40V

Electrical current


3. Operation in controlled atmosphere:

• Product is heated in a confined atmosphere

• Gas can be injected through the process

• Gas sucking is possible as well


The main operating parameters are then:

• temperature (+/- 1°C) – with 2 or 3 independent heating zones

• residence time

• atmosphere inside the tube

• flowrate of product



Example of a 5 ton/h roaster Example of a 1 ton/h roaster

Example of a 2 ton/h roaster

Example of a 300 kg/h roaster

Example of applications in food industry

• Cereals can be processed very well

• Even fine particles like wheat flour can be processed

Wheat flour – 220°C , 0 – 3 – 6 – 9 – 15 – 30 mn

Roasted barley: 240°C , 0 – 5 – 10 – 15 – 20 – 25 – 30 – 35 mn

Revtech for biomass torrefaction

• Feasibility on various biomasses

• Effect on facilitating grinding

• Effect on moisture intake

Torrefaction of various biomass

Biomass Moisture (%) Density (g/cm3) Particule size (mm) Mass flowrate (kg/h)

Wood chips 11.8 0.28 5-20 85

Pine barks 59.7 0.33 10-40 95

Olive pips 20.3 0.66 5 140

Straw 11.0 0.05 20-100 10

Torrefaction of olive pips

EU BC&E 2013 22

6’ 12’ 18’ 24’ 30’Raw

260°C

280°C

• Initial humidity around 20 %• Power consumption: around 250 kW.h / ton

Torrefaction of wood chips

3’45 7’30 15’ 22’30 30’Raw

260°C

280°C

300°C

• Initial humidity around 12 %• Power consumption: around 150 – 200 kW.h / ton

WSED next Biomass 2014 24

Effect on grinding

Results on particle distribution using a blade grinder:


Effect on Energy Densification

T (°C) t (min) YS (% ar) HHV (MJ/kg) η (%) dη

260 30 74.2 20.31 89.4 1.20

280 30 64.3 21.07 80.4 1.25

300 15 59.4 22.06 77.7 1.31

300 30 50.8 22.78 68.6 1.35

Conditions: Runs at 85 kg/h (H = 12 %) (HHV: 19.12 MJ/kg)

Mass yield Heating value Energy yield Energy densification

Ideal for pellets production

Ideal for co firing / gasification


Torrefaction of pine pellets


Pellets Din+ < 8 > 0.65 6 x 30 200

t = 0

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C

Moisture uptake test



Pellets Din+ < 8 > 0.65 6 x 30 200

t = 30 s

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C





Pellets Din+ < 8 > 0.65 6 x 30 200

t = 1 min

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C





Pellets Din+ < 8 > 0.65 6 x 30 200

t = 2 min

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C





Pellets Din+ < 8 > 0.65 6 x 30 200

t = 3 min

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C





Pellets Din+ < 8 > 0.65 6 x 30 200

t = 4 min

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C





Pellets Din+ < 8 > 0.65 6 x 30 200

t = 8 min

9’ - 260°C6’ - 280°C

Raw

3’ - 260°C3’ - 280°C

15’ - 260°C9’ - 280°C

21’ - 260°C12’ - 280°C

27’ - 280°C


15 min at 260°C or 9 min at 280°C are sufficient

YS ≈ 75% & η ≈ 90%


Conclusions

• Various kind of biomass have been successfully torrefied in the REVTECH: Raw biomasses : wood chips, barks, olive pips, straw Pellets

• Pellets : low torrefaction degree is sufficient (YS≈75% and η≈ 90%)

• REVTECH integration: • Energy efficiency : 80-90% 250 kW.h/ton• Simple and compact unit• Versatile : pre- or post-pelletisation / all particle size / very homogeneous

Next steps:

Gas treatment: energy recovery

Heat integration: drying step, …

REVTECH Roasting Technology - asew-expo.com. Mr. Sebastien Muller_REVTEC… · REVTECH Torrefaction...

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