Nowadays the treatment of biomass to produce methane gas for energy generation is becoming increasingly popular due to the rising costs of primary energy and the massive increase of the worlds’ power demand. Several processes are used for the methanisation of biomass. Also an increasing range of biomass sources such as corn, wooden chips or food waste can be processed.
Putzmeister Solid Pumps (PSP) has more than 20 years experience in transporting biomass, and the unique construction of our pumps makes it possible to convey various types of biomass material, including those that are contaminated with foreign objects like knives, spoons, bottle-caps or glass, which can dramatically disturb the fermentation process.
By using hydraulically driven piston pumps it is possible to convey biomass through the treatment process whilst guaranteeing reduced life cycle costs compared to other transportation methods. A completely sealed system between the points the material enters and leaves the process is also ensured. Furthermore Putzmeister has also developed a process to sort out foreign particles during the pumping process. With the EKO Type Pump Press Putzmeister Solid Pumps is able to seperate biomass from its packing or other substances.
Different pumps for different kinds of biomass
For biomass and biowaste collected from households, restaurants, supermarkets or other sources, it is necessary to avoid any obstructions of the flow of material through the pump or possible feeding devices. This construction is required as biomass material is inconsistent, and will be prone to blocking if there is anything interrupting the material flow. To avoid these problems PSP has developed a range of different pumps to enable trouble-free operation.
The EKO single cylinder piston pump is able to pump bulky wet material as well as stiff sludges with large grain sizes. With the EKO 1060 PP it is possible to separate foreign particles from the biomass to enable better digestion in the fermentation process. Some EKO pumps have been pumping for more than 80.000 hours interruption.
The KOS double cylinder piston pump is able to pump bulky wet and pasty material including some large particles. Some KOS piston pumps have been pumping for more than 160.000 hours without any serious interruptions.
The KOV douple cylinder piston pump is able to pump liquid and wet material. Due to having large inlet and outlet openings this pump type can also cope with some large particles without any disturbance of the pumping process. Some KOV piston pumps have been pumping for more than 100.000 hours without any interruptions.
Dry-anaerobic fermentation of biomass
Organic household residues: This waste is collected and transported to a bio-methanisation plant. As there are still many non-organic foreign particles remaining in the waste material, it has to be passed through a shredding device, rotation sieve and magnetic separator. Thereafter this material is fed into a piston pump together with steam and digested material, to pump this mixture into the digester.
Renewable primary products
An example: From an aprox. 500 acre area growing biomass crops, it is possible to produce 500 kW/h of electrical energy. This process starts with a transportation belt in the reception area moving the material to a dosing unit that feeds it into a twin auger mixing device. This blends it with manure in a 1:1 ratio, and the mixed material passes into a hydraulically driven piston pump conveying it into the thermal pressure hydrolysis system. This system reduces the retention time of the biomass required to produce methane gas.
Biomass from food leftovers and packaged foodstuffs
In the BioPower (Bernau), M.U.T. (Kössen, Austria) and Bioenergie (Schlitters, Austria) plants, food leftovers are processed together with packaged food. In a process expired food is unwrapped in a separation stage (separator). In the separation stage, the high-density solids pump directs the more solid components (e.g. packaging and containers made of plastic, glass, paper and aluminium foil), after heating, to a container. The substrate, i.e. the valuable residual material, flows through the separator and is pumped by a KOS high-density solids pump into the fermenter. In order to extract the remaining biomass, the residue is again boiled and compressed. The remaining packaging material is then disposed in a household waste incineration plant.