FOR EXTREMELY EFFICIENT Size reduction OF FIBRES
The straw mill SD has been specially designed for crushing fibrous material such as
- straw
- hay
- alfalfa
- miscanthus
- hemp
- jute
- coconut fiber
A comb in the inlet area as well as the special geometry of the grinding chamber grind the fibres particularly efficiently. Foreign bodies are separated by means of a catch pocket that is accessible from the outside. The beaters are fixed to carrier frames, which can be quickly and easily changed with a supplied device. This means that it only takes a few minutes to change the beaters and downtime is reduced to a minimum.
The straw hammer mill with optimized geometry
The straw mill SD is specially adapted to the grinding of straw due to its special geometry. The result is high throughput and low energy consumption. Low bulk densities and very large volumes of processed straw pose no problems for the Straw Mill SD. The straw can be easily broken down to the typical fineness of 10 mm or less (depending on the specifications of the fermenter manufacturer) and is thus optimally prepared for anaerobic digestion. The dry straw is transported pneumatically in an energy-efficient and low-wear manner.
Like all our mills, the straw mill SD meets the highest industry standards and is designed for continuous use over many years. The straw mill SD series consists of two housing sizes for motorization from 90 kW to 250 kW drive power.
Once the straw has been broken down, we can efficiently and reliably mix it with your fermentation substrate or slurry so that it can be fed directly into the biogas plant after processing.
In straw mono-digestion, the Impra system can additionally be used as a stock preparation system to further break down the fibres in the process.
Efficient Grinding of Fibrous Products
- Geometry of the grinding chamber specially designed for the size reduction of fibres
- Intake and pneumatic transport of the material through the grinding chamber via the aspiration air
- Optimised inlet with ripping comb, adjustable from the outside to the product properties
- Large dimensioned inlet and outlet for high volume flows with low bulk densities
- Variable grist spectrum by adjusting the beater circumferential speed (when using a frequency converter), screen perforation and beater configuration
Reliable Operation and Long Service Life
- Robust welded steel construction for continuous industrial operation (24/7)
- Grinding chamber equipped with wear elements to protect the housing, easy to change
- Durable, optimised rotor design, dynamically balanced
- To protect the screens: foreign body catch trap for impurities inside the grinding chamber
High Availability with Low Downtimes
- Quick and easy change of beaters due to beater frame system, beaters can be changed outside the mill
- With a second beater frame, the machine is immediately ready for use again
- Rotor with short run-down time < 6 min without brake
- A large sliding door allows easy and quick access to the machine interior
- 3-part screen segments without frame, easy and quick to change segment by segment, clamped with chains
High Safety of Personnel and Plant
- Standstill monitoring with door safety device
- Pressure shock resistant and flameproof design (0.4 bar)
- ATEX design according to zone 21 (II 2 D) inside and zone 22 (II 3 D) outside optionally possible
Technical Data
- Geometry of the grinding chamber specially designed for comminution of fibers
- Suction and transport of material from the grinding chamber via aspiration air
- Variable particle size spectrum by changing the beater peripheral speed (when using a frequency converter)
- Robust welded steel construction for industrial continuous operation. With a second set of beams, the machine is immediately ready for operation again.
- Standstill monitoring with door safety device
| SD 12 | SD 25 | |
|---|---|---|
| Grinding chamber diameter (mm) | 1200 mm | 1200 mm |
| Screen width (mm) | 640 mm | 1250 mm |
| Grinding chamber area (m²) | 1.84 m² | 3.60 m² |
| Dimensions and Weight | ||
| Length* x width x height (approx. mm) | 2340 x 1550 x 1620 mm | 3150 x 1550 x 1620 mm |
| Weight without motor (approx. kg) | 1900 kg | 2900 kg |
| Drive | ||
| Motor size (kW) | 90 – 132 kW | 160 – 250 kW |
| Speed 50 Hz/60 Hz (rpm) | 1500/1800 | 1500/1800 |
* Depending on motor size Measuring surface sound pressure level < 88 dB (A) (under load)
Download data sheet
