mississippi digestate drying system for biogas plants · mississippi digestate drying system for...

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Agricultural District of Lower Saxony, GermanyEnergy Consulting - Bremervörde

MississippiDigestate Drying System for Biogas Plants

Verden, 24.05.2011 / Present. 2015

Burkhard Meiners

Brunner Straße 18

26316 Varel, Deutschland

Tel: +49 (0)4453 - 98 58 00

Mobile: +49 (0)179 - 20 31 052

Email: [email protected]

Web: www.agroenergien.de

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Burkhard Meiners - www.agroenergien.de - Email: [email protected] - Tel: +49 (0)4453 985800

Mississippi-Digestate Drying System

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Mississippi – Digestate Drying System

• Products of the Mississippi• Structure• Drying Process• Control and Pumping Schematic• Sketch Diagram• Air Purification System• Integration of Biogas Plant• Flowchart• Maintenance and Repair• Transport• Plant Examples / References and Credentials• Conclusion

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• The Mississippi does not produce:– Granules– Cow Bedding– Dry fertilizer

Products of the Mississippi

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• The maximum dry matter content theMississippi can produce is 12% DM (Dry Matter).

• The Mississippi‘s product remainspumpable.

• Doubling the dry matter content, halves the volume and thereby greatlyincreases the financial feasibility oftransporting the product.

Products of the Mississippi

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2 - Ventilators

Heat Exchanger (Water/Air)Stainless Steel Rotor Housing

Electric Motor for Rotor with Power Rating of 0,37kW.

Digestate Basin Digestate Inlet and Outlet

Mississippi System Overview

Floating Ball Tank Gauge.

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Structure of the Mississippi

Mississippi - Rotor Blades

D = 2.350mm, L = 2.800mm

Heat Exchanger

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Drying Process - Sketch

Digestate Basin

• 40 Blades (2,800mm x 800mm) drying surface of 180m².

• Blades constantly rotate within the digestate at 0.5 rev./min.

• The blades are wet on bothsides after rotating.

• The air stream is heated by the heat exchanger to evaporate the liquid from the digestate.

• The evaporative cooling method leads to a cooling of the exiting air flow which then enters the air purification system.

Blades with large drying surface

Heat Exchanger

Heated Air StreamMoist Saturated Air

Ventilator

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• Blades on both sidesto dry the wet digestate.

• The digestate will not continually build up on the blades.

Drying Process

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Control / Pumping Regime

Rotary lobe pump for

filling the digestate

basin and pumping of

the dried digestate.

Floating ball gauge and individually

adjustable sensors for measuring

the liquid level in the digestate

basin.

Digestate slide valve with

automatic control.

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Control / Pumping(Filling Basin)

• Drainage slide valve is closed.• Filling slide valve is opened.• Digestate pump delivers the

digestate through the tank gauge to be dried in the basin.

• Measurement of the digestatelevel by the floating ball gauge.

Filling Slide Valve

Draining Slide Valve

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Control / Pumping(Draining Basin)

Filling Slide Valve

Draining Slide Valve

• Drainage slide valve is opened.• Filling slide valve is closed.• The rotary lobe pumps the dried

digestate from digestate basin.

• Measurement of the digestatelevel by floating ball gauge.

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Control / Pumping

• Control of drying process:- Fully Automatic- Continous Batch Processing- Regardless of fluctuations in the Heat

Supply

Minimal Digestate Level (900 Liters)

Maximum Digestate Level (3,500 Liters)

The variable level meter emits a signal to pump the dried substrate.

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Control / Pumping

No hassel operation, even with a fluctuating Heat Supply !!!

… only the duration of the drying time changes!

Dry Digestate Content 6.00% DM 6.00% DM

Dry Digestate Target 8.00% DM 8.00% DM

Bio Digester drying heat available 300 kW 100 kW

Evaporation Rate 0.6 Liter/kWh 0.6 Liter/kWh

Maximum Fill level 3,500 Liters 3,500 Liter

Evaporation Quantity 650 Liters 650 Liters

Level after Drying 2,850 Liters 2,850 Liters

Amount of Dried Digestate 1,950 Liters 1,950 Liters

Minimum Digestate Level (before Refilling) 900 Liters 900 Liters

Duration of Drying Interval 3.61 Hours 10.83 Hours

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M601-06 with Air Purification MS40.000 (max. 600 kW thermal)

Layout Sketch

Acid Water Filter

Aerosol Filter

Heat ExchangerSulfuric Acid Tank

Ventilators

InletOutlet

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Sectional Sketch

M601-06 with Air Purification MS40.000 (max. 600 kW thermal)

Air Purification System Digestate Drying Process

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Air Purification / Ammonia Scrubber

The Mississippi digestate drying system upholds the TA-Air

mandatory limits by proper operation through the use of an air

purification system in all operating conditions.

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Clean Air Saturated Air

Fresh water

Drain

Sulfuric AcidCirculation

Pump

Valve

Pressure Sensor Chamber 1

Pressure Sensor Chamber 2

Ammonia Filter

Humidification

Aerosol Filter

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Hummidification via „Plastic Pipe“

Filterwall of Woven Plastic

Mildly acidic wash water is recycled; The pH is regulated by the addition of sulfuric acid to capture Ammonia.

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• The Mississippi processed digestate produces no dust!

• Where there is no dust, no dust needs to be cleaned out!

• This means that the ammonia scrubber, of a Mississippi, is not prone to failures and

maintenance-intensive dust cleaning is avoided.

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Wash water (ammonium sulfate).

The process produces no dust-related particulate matter that may affect the viability and efficiency of the air purification system.

Maintenance is significantly reduced!

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Integration of in-out flow at the Storage Tank.

Digestate Processing

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Integration of 2nd Fermenter and Storage Tank.

Storage Tank1st

Fermenter2nd

Fermenter

DigestateIntake

Mississippi - Digestate drying plant bypass between secondary fermenter and storage.

LocationTyp M301 - 06

Dipl. Eng. Burkhard MeinersBrunner Straße 1826316 Varel

04453 – 985800 / 0179 – 2031052www. agroenergien.de04.06.2011

2323



Inclusion with an existing on-site digestate pump.

Digestate Storage Tank

2nd Fermenter

Pump House

CHP

Transformer

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Inclusion: ...with prior separation.

Digestate Storage Tank2nd Fermenter

CHP

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Flowchart: Mississippi Drying Efficiency, 0.6 liter/kWh.

*All statements without guarantee

Digestate

500 kW thermal 8,000 hrs./yr. 0.6 ltr./kWh efficiency

Evaporation

Dried Digestate

DM

DM

Storage I

GS1

Folie 25

GS1 Gunnar Shaffer; 19.04.2015

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Flowchart: Separation + Mississippi Digestate Drying with a Storage Tank.

100% ~ 10%

~ 40%

~ 50%

Discharge of the storage to ~50%

Alle Angaben ohne Gewähr

Digestate

Evaporation


DM

DM

DM

DM

Solid Material

Digestate

Dried Digestate

Storage I

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Flow Chart: Separation + Mississippi Digestate Processing with

Storage Tanks I and II

100% ~ 20% ~ 20% ~ 20%

~ 40%

Discharge of the storage to ~50%.High concentration of the dried digestate.

*All statements without guarantee

Digestate

Digestate

Digestate

Dried Digestate

Evaporation


Solid Material

DM

DM

DM DMDM

Storage IStorage II

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Maintenance & Repairs

No bearings, chains or sprockets, that are in direct contact with the material to be dried or the air drying system. This greatly reduces downtime!

The two robust bearings that guide the Mississippi rotor are easily accessible.

Grease Gun

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Transport

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Installed Example: M301-10 Split with 3-stage Air Purification

Mississippi M301 - 10 grit - series - 3-stage air purification (2 x Chemical Washer / 1 x Bio filters) - 300kW thermal power~ 2,500 m³/year evaporation performance

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Installed Example: M601-06 with Air Purification

- 600 kW thermal output

- 0.6 liter/kWh evaporation efficiency

…on-site housing

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Installed Example: M601-1006 split

Mississippi M601 - 1006 grit-600 KW thermal output in Summer mode-300 KW thermal output in Winter mode~ 2,800 m³/year evaporation performance

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Installed Example: M1204-10

M1204-10

- 2 x 2 Mississippi

- 1.2 MW thermal

- 1.0 Liter/kWh efficiency

Single-stage air purification for

80,000 m³/hr. flow rate

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Installed Example: M1202-06 with Upstream Sanitation

3 Sanitation Stirring Tanks, 8m³ each.

Tube-in-Tube heat exchanger for

heating the digestate to 70 °C for

60 minutes.

Mississippi Digestate System

... Overflow Neck

with an underlying collection container.

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• Within the slurry line; the digestate is liquid and pumpable after the drying process.• High evaporation rates (kg water evaporation per kWh thermal).• Very low power consumption, since the power of the motor for the rotor is only 0.37kW

and the drying area is not a real "barrier" in the air stream.• Dust-free air from the drying, facilitates the air purification system and makes the system

less susceptible to downtimes.• Minimal repair and maintenance costs because of the dust-free processing technology.• > 50% possible reduction in liquid digestate by installing a Mississippi.• Alleviates the need for a warehouse and therefore reduces the investment costs for

storage, transportation and application costs.• Option for subsequent system changes due to the compact modular design.• 3ct CHP bonus (GERMANY).• References from national & international locations.• On-site visits possible.

Thank you for your attention !!!

Conclusions

mississippi digestate drying system for biogas plants · mississippi digestate drying system for...

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