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DORSET
Biomass Drying Systems
André Hermsen
Private company, grounded in 1985
Aalten, The Netherlands, 120 employees
Annual turnover € 25 million
• Biological Air Washers for pig and poultry farming
• Sorting systems for selecting pigs in large groups
• Feeding systems
• Animal identification
• Access control and time attendance systems
• Industrial reading equipment
• Customer specific electronics (e.g. Pig sorting system)
• Drying systems for liquids, slurries and solids
• Chemical air cleaning systems
• Biological air cleaning systems
Drying biomass
• Liquids, slurries and solids like:
- substrates from biogas plants
- (poultry) manure
- sewage sludge
- wood chips, sawdust, leaves, bark
- grass, luzerne
- paper pulp
- maize
- etc.
Waste heat sources
• Returned cooling water from CHP’s and ORC’s (90⁰C)
• Hot water from exhaust gas coolers (90⁰C)
• (Industrial) steam or condense water (various temperatures)
• Heat from ventilation poultry houses (20⁰C)
Reasons to dry an organic product
• Adding value
transformation into:
- organic fertilizer
- bedding for cows
- fuel
- preparation for storage
• Lower transport costs
- reduced weight
- reduced volume
Plate belt dryerPlate belt dryer
Turning point
Dry product collection
Product flow
Air flow
Dryer in container
22.000 t/a digestate (pig manure)
20%dm → 90%dm
2,8 MWth
Dorset dryers: 2x MBD18 HT
Top loaders, silos, pelleting 2t/h
Chemical air cleaning
Biological air cleaning
Air Cleaning
Chemical Air Cleaner
Goal: Removing Ammonia
Biological Air Cleaner
Goal: reducing Smell
Combination of both
DORSET chemical air cleaner
Emissions
Dust < 10 mg/m³
Ammonia < 10 mg/m³
Smell < 500 GE/m³ (250 ouE)
Biological air cleaner
2000 m³ air/h per m² filter surface
Example (field measurement):
after dryer: 3775 GE/m³
after biowasher: 170 GE/m³
(target smell value: ˂ 500 GE/m³)
1 GE = 0,5 OU
Drying poultry manure
Advantages:
• Lower transport cost (up to 65% less weight)
• Dry manure is valuable product (fertilizer and fuel)
• Reduction of dust emissions by 70%
• Less smell at barn (because of less dust and dry storage)
Poultry house
ventilation air →
(free energy)
Pelleting plant
manure belts
poultry houses
dryer
dryer
air duct
André Hermsen
Telephone: +31.543472103
Mobile: +31.615559328
E-mail: a.hermsen@dorset.nu
Web: www.dorset.nu
Fertilizer
layers broilers
N (Nitrogen) 4% 3%
P (Phosphorus) 3% 4%
K (Potassium) 2% 3%
Fuel 13 MJ / kg (12,300 BTU)
Dry poultry manure
Pelleting
Pelleting plant:
• Bunker
• Crusher
• Press
• Sanitation (70⁰C, 1 hr)
• Cooling
• Bagging
Capacities: 125 kg/h
400 kg/h
800 kg/h
2000 kg/h
Heat recovery
.
Wood chips, sawdust, grass, fluff
Separator
Dryer Dryer with
back-mixing
85% dm
Digestate
85% dm
• Bedding material
• Fuel
• Fertiliser (pelleted)
• Fertiliser
Cascata
(thickener)
• Storage volume reduction
2 - 5% dm 25% dm 8% dm
8 - 14% dm
Hot water 90⁰C
Back mixing
Example NPK-values
Separated Back-mixing
(screw press) (decanter)
N 18 15 26 (g/kg)
P 18 49 31 (g/kg)
K 20 23 60 (g/kg)
N - nitrogen: promotes growth of leaves and vegetation
P - phosphorus: promotes root and shoot growth
K - potassium: promotes flowering, fruiting and general hardiness
Example 500 kWth dryer
in: out:
8% ds 3.532 t/a 85%ds 332 t/a
25% ds 4.000 t/a 85% ds 1.176 t/a
Water: 400 t/a Ammonium Sulfate:
453 t/a 292 t/a (4,24%)
Acid: 38 t/a 331 t/a (4,24%)
43 t/a Water with dust:
146 t/a
165 t/a
Dryer
Air cleaner
DORSET Cascata (thickener)
Product in: liquid 2 - 5%
Product out: liquid 8 - 14% (40% weight reduction)
Drying efficiency: 0,6 - 0,8 kg/kWth
Thank you for your attention !
Dorset Green Machines B.V.
Weverij 26
7122 MS Aalten
The Netherlands
T: +31 (0) 543 472103
F: +31 (0) 543 475355
E: a.hermsen@dorset.nu

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Presentation Dorset Green Machines (André Hermsen)

  • 2. Private company, grounded in 1985 Aalten, The Netherlands, 120 employees Annual turnover € 25 million
  • 3. • Biological Air Washers for pig and poultry farming • Sorting systems for selecting pigs in large groups • Feeding systems
  • 4. • Animal identification • Access control and time attendance systems • Industrial reading equipment • Customer specific electronics (e.g. Pig sorting system)
  • 5. • Drying systems for liquids, slurries and solids • Chemical air cleaning systems • Biological air cleaning systems
  • 6. Drying biomass • Liquids, slurries and solids like: - substrates from biogas plants - (poultry) manure - sewage sludge - wood chips, sawdust, leaves, bark - grass, luzerne - paper pulp - maize - etc.
  • 7. Waste heat sources • Returned cooling water from CHP’s and ORC’s (90⁰C) • Hot water from exhaust gas coolers (90⁰C) • (Industrial) steam or condense water (various temperatures) • Heat from ventilation poultry houses (20⁰C)
  • 8. Reasons to dry an organic product • Adding value transformation into: - organic fertilizer - bedding for cows - fuel - preparation for storage • Lower transport costs - reduced weight - reduced volume
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  • 17. 22.000 t/a digestate (pig manure) 20%dm → 90%dm 2,8 MWth Dorset dryers: 2x MBD18 HT Top loaders, silos, pelleting 2t/h Chemical air cleaning Biological air cleaning
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  • 19. Air Cleaning Chemical Air Cleaner Goal: Removing Ammonia Biological Air Cleaner Goal: reducing Smell Combination of both
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  • 22. DORSET chemical air cleaner Emissions Dust < 10 mg/m³ Ammonia < 10 mg/m³ Smell < 500 GE/m³ (250 ouE)
  • 23. Biological air cleaner 2000 m³ air/h per m² filter surface Example (field measurement): after dryer: 3775 GE/m³ after biowasher: 170 GE/m³ (target smell value: ˂ 500 GE/m³) 1 GE = 0,5 OU
  • 24. Drying poultry manure Advantages: • Lower transport cost (up to 65% less weight) • Dry manure is valuable product (fertilizer and fuel) • Reduction of dust emissions by 70% • Less smell at barn (because of less dust and dry storage) Poultry house ventilation air → (free energy)
  • 25. Pelleting plant manure belts poultry houses dryer dryer air duct André Hermsen Telephone: +31.543472103 Mobile: +31.615559328 E-mail: a.hermsen@dorset.nu Web: www.dorset.nu
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  • 28. Fertilizer layers broilers N (Nitrogen) 4% 3% P (Phosphorus) 3% 4% K (Potassium) 2% 3% Fuel 13 MJ / kg (12,300 BTU) Dry poultry manure
  • 29. Pelleting Pelleting plant: • Bunker • Crusher • Press • Sanitation (70⁰C, 1 hr) • Cooling • Bagging Capacities: 125 kg/h 400 kg/h 800 kg/h 2000 kg/h
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  • 33. . Wood chips, sawdust, grass, fluff
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  • 36. Separator Dryer Dryer with back-mixing 85% dm Digestate 85% dm • Bedding material • Fuel • Fertiliser (pelleted) • Fertiliser Cascata (thickener) • Storage volume reduction 2 - 5% dm 25% dm 8% dm 8 - 14% dm Hot water 90⁰C
  • 38. Example NPK-values Separated Back-mixing (screw press) (decanter) N 18 15 26 (g/kg) P 18 49 31 (g/kg) K 20 23 60 (g/kg) N - nitrogen: promotes growth of leaves and vegetation P - phosphorus: promotes root and shoot growth K - potassium: promotes flowering, fruiting and general hardiness
  • 39. Example 500 kWth dryer in: out: 8% ds 3.532 t/a 85%ds 332 t/a 25% ds 4.000 t/a 85% ds 1.176 t/a Water: 400 t/a Ammonium Sulfate: 453 t/a 292 t/a (4,24%) Acid: 38 t/a 331 t/a (4,24%) 43 t/a Water with dust: 146 t/a 165 t/a Dryer Air cleaner
  • 40. DORSET Cascata (thickener) Product in: liquid 2 - 5% Product out: liquid 8 - 14% (40% weight reduction) Drying efficiency: 0,6 - 0,8 kg/kWth
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  • 42. Thank you for your attention ! Dorset Green Machines B.V. Weverij 26 7122 MS Aalten The Netherlands T: +31 (0) 543 472103 F: +31 (0) 543 475355 E: a.hermsen@dorset.nu