WASTE TO ENERGY


BIOGAS MIXING PUMP SETS NEW STANDARDS


igher gas yield and efficient use of substrates: these are the advantages offered to biogas plant operators using Netzsch’s Nemo B.Max mixing pump. As the core element of a biogas plant, substrate feeding is decisive in terms of achieving a biologically stable methane production process. The mixing pump is setting new standards with its maximum homogenisation and continuous pressure-stable, smooth and low-pulsation conveyance of biosubstrates. Netzsch’s progressing cavity pump is


H


an ideal feeding technology for biogas applications. Solids from the dosing unit


are mixed with recirculated substances in the mixing pump. The homogeneous mixture with a dry matter content of up to 25% is then conveyed to the fermenter. The Nemo B.Max provides twofold assurance of optimum product feed into the conveying chamber: its pump housing is fitted with a large, rectangular feed hopper and removable, conically shaped compression chamber, as well as a coupling rod with horizontally positioned conveying screw. This conveys quantities of up to 75m3


/h


at pressures of up to 48 bar. Ideal feeding and mixing of the substrates into the biomass are ensured by the spiral lobes of the mixing and screw conveyor, which have been strengthened and offset. This not only prevents bridging, but also leads to optimum mixing of the liquid phase and dry substrate in


the hopper chamber. At the same time, the feed tube, installed on the hopper housing contra to the flow direction of the pump, also ensures improved substrate mixing – which means a higher gas yield too.


Netzsch designers have achieved


compact dimensioning, low overall weight and constant shaft height, irrespective of the design and size of the drive, by flanging the drive directly to the pump’s lantern. The system can be flexibly adjusted to the dosage unit in each case through the various hopper lengths on offer. Numerous inspection openings in the hopper and compression chamber of the pump make it easier for operators to carry out inspection and maintenance. l


For more information visit www.netzsch.com


FAST MODERNISATION of BIOGAS PLANT A


s of 1 August 2018, Nordmethan, a company of the Weltec Biopower


Group, has taken over an insolvent biogas plant in Südergellersen, Lower Saxony. The German specialist for the development and operation of biomethane and biogas plants will fully modernise the technical and operational overall concept of the 2.2MW plant. The project development work


is currently under way. “Following a takeover negotiation process of about two years, we will speedily modernise the plant technology to ensure it’s a going concern,” says Jens Albartus, director of Weltec Biopower and Nordmethan. The original plant had been set up in 2009 and expanded in 2014. The operator’s concept was based on the digestion of horse manure and sale of the digestate as fertiliser


pellets. However, as the concept turned out to be technically difficult and economically unfeasible, the plant went bankrupt. Following the takeover by the Weltec Group, the substrate input is now being adjusted, and the plant technology is being modernised. Henceforth, the two digesters with a capacity of 3,000m³ each will be largely fed with renewable raw materials and horse manure from local suppliers within a range of less than 15km. The generated biogas will be used to run two cogeneration power plants with an electrical output of


1.1MW each. Nordmethan will supply the power to the public power grid. Part of the exhaust heat from the cogeneration is to be used for drying the digestate. Initially, extensive upgrade and


repair work will be performed to ensure profitable operation of the biogas plant: among other things, the investments comprise modernisation work on the two cogeneration power plants and the solid matter input systems. “Additionally, we will install two digestate storage units and two digestate dryers. By equipping the biogas plant with modern control technology and a drive-in silo system, we will ensure flexibility for all requirements,” says Albartus, explaining the background of the conversion measures. l


For more information visit www.weltec-biopower.com


www.engineerlive.com 43


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52