small biogas plants

Pumps for Efficient Operation of Small Biogas Plants

NEMO® B.Max mixing pump optimises homogenisation and mixing

Compensation for biogas operators is increasingly being cut, and subsidies are being cancelled. Thus it is even more important that the efficiency of small biogas plants, in particular, is increased. NETZSCH Pumps & Systems developed an innovative solution for homogenising and mixing the substrate as a global specialist for complex fluid management.

We will show you how to save electricity and substrate when feeding the fermenter using a NEMO® B.Max mixing pump and thus operate even small biogas plants efficiently.

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Biogas Plants, Biogas, NETZSCH, Pumps, Systems

Reduce costs and minimise effort when pumping in biogas troughs

The generous subsidies for renewable energies triggered a biogas boom in Germany years ago. However, since these have been discontinued for some time and the payments have been significantly reduced, small biogas plants, particularly, have to fear their existence. As in many areas, the same applies to the biogas sector: Reduce costs and minimise effort. To optimise biogas plants, specially coordinated pumps and systems are necessary. With an innovative pumping solution for feeding, the substrates can be homogenised, mixed and inoculated with fermentation bacteria even before they reach the fermenter. Thus even small biogas plants can be operated efficiently again.

Mixing pump for biogas substrates replaces vulnerable screw conveyors

Biogas production's core is biomass fermentation by specialised fermentation bacteria. The better these can work, the higher the gas yield. Therefore, your plant design should be designed to create the ideal habitat for microbial helpers. If possible, this includes good pre-crushing of the biogas substrates to create more surface area for the fermentation to attack, thoroughly mixing the substrate so that the bacteria are distributed everywhere and even temperature control of the digester. However, the usual biomass mix of silage, plant cuttings, and dry components such as chicken manure and slurry provides a relatively poor basis for this. The inhomogeneous composition restricts fermentation and makes feeding the digester more difficult. Screw conveyors are often used for dry feeding, which can transport any material but are also prone to failure and bulky. NETZSCH, therefore, developed a mixing pump to optimise the biogas process.

1000

cubic metres per hour can be pumped

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The NEMO® B.Max sets new standards in biogas and environmental technology through maximum mixing and conveyance of the media. 

This pump makes a mixing vat in biogas plants superfluous

The NEMO® B.Max mixing pump is based on the proven progressing cavity technology, in which a rotor rotates in a geometrically matched stator. This opens up uniform delivery chambers in which the medium is gently conveyed from the suction to the discharge side, regardless of its consistency. At the same time, the technology makes a separate mixing vat superfluous. The pump, specially developed for biogas plants, allows you to convey the biomass over longer distances and uphill gradients, giving you more flexibility in designing your biogas plants. For particularly lumpy fibrous substrates with a high dry substance content, you can also integrate or retrofit an aBP-Module® on the pump. This prevents bridging using rotating wheels on the side walls.

For even greater operational safety, especially where very coarse raw materials are to be utilised in the biogas plant, it is advisable to connect a shredder upstream of the pump. This is a preventive measure against potential damage to pumps and systems. Impurities such as stones are discharged, and long-fibre plant residues are cut up before they lead to damage and clogging. NETZSCH has developed the M-Ovas® universal plate macerator for this purpose, which consists of a cutter head with carbide cutting blades and a double-sided cutting plate made of hardened steel. The TORNADO®rotary lobe pump was also designed for tasks with a high delivery volume, such as emptying slurry tanks or substrate circulation. Thanks to the large delivery chamber and the vast free ball passage, it is largely immune to blockages. Depending on the version, you can thus pump up to 1,000 m³/h of biogas substrate.

NEMO® B.Max mixing pump in block design 

  • Medium: Fermentation substrate
  • Throughput volume: 70 m³/h
  • Pressure: 48 bar
NEMO® B.Max Mixing Pump in Block Design, NETZSCH, Pumps, Systems