Autumn 2017 EN

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English Issue Biogas Journal | Autumn_2017 Key Figures, Biogas Plant BERD ZWO GmbH & Co.KG CHP: 550 kW Jenbacher, Model 312. 1 digester: 2,000 m³ net volume. 1 post-fermenter: 2,000 m³ net volume. 1 fermentation product storage: 4,800 m³ storage volume. Feed supplied: Maize silage, a little grass silage, stover bull stall manure, pig manure, cattle manure, sugar-beets, maize stover/sugar-beet silage. Ø Methane content: 51.5 percent Electricity production: 4.6 million kWh, 8 percent for the plant’s own needs. Drying of fermentation residue Pieper continues: “We transported the maize stover about 7 to 10 kilometres to the biogas plant. Three loading wagons were used for transport. However, three were not enough. The loading wagons accommodate between 8 and 11.5 tonnes of maize stover per load. We harvested 14 tonnes of stover per hectare with an average of 30 percent dry matter”. Maize stover absorbs beet juice Like silo maize, the chopped maize stover was piled up in layers and compressed with a telehoist load lugger. A telescopic handler with a loader bucket incorporated the sugar-beets in the maize stover. The bucket has a capacity of 1.6 tonnes of sugar beets. Chopping begins not before the layer of the stover on the ground is 20 centimetres thick. The sugar beets from field stacks are added to the maize stover unwashed. By weight, the maize stover/sugar-beet silage is made up of 70 percent stover and 30 percent sugar beets. Silage effluent did not seep out of the silage heap because the stover absorbs the beet juice very well. Is the dry matter content of the maize stover higher even more sugar-beets can be added. The costs for harvesting 25 hectares of maize stover: ffHarvester, 8-row maize header: 157 € per hectare, including driver and diesel fuel. ffMaize chopper: 195 € per hour, including driver and diesel fuel. ffLoading wagon: Tractor with chopper wagon (volume of 55 m³), including driver and diesel fuel; 85 € per hour per wagon. ffCylinder tractor per hour, in total: 62 €. ffSilo covering (3 people, 15 € per hour for 3 hours), including foil: 380 €. ffChopping 30 percent (by weight) sugar-beets into the silage – telescope handler, driver, diesel fuel, loader bucket – 65 € per hour, total cost: 520 €. ffCost per tonne of sugar-beets to silage plate of biogas plant: 30 €. ffCost per tonne of silaged maize stover (dry matter): 60 €, not including harvesting costs. Chopping the beets into the stover and covering costs extra. The chopped material contained frequently husk leaves and longer stalk parts because not all of the blades were mounted on the chopping drum of the chopper. photo: Martin Bensmann 22
Biogas Journal | Autumn_2017 English Issue photo: Firm Geringhoff For this reason, Mr. Klapprott recommends using as many blades as possible to chop the maize stover. He wants to do that this year. He doesn’t think of using a loading wagon with cutting system because due to the cutting length more husk leaves and stalk parts will fit through – similar to the situation now with the chopping drum with few blades in the chopper. Nevertheless, he acknowledges that with the loading wagon with cutting system assuming the same volume more stover fits on the loading wagon and the harvesting costs are lower than those with the chopper. Pieper, however, does not want to dispense with the chopper because he doesn’t want to install a separate technology, which would increase the biogas plant’s need for electricity. He would rather let biology do its work in the fermenter vessel. In his region yields of sugar-beet plants of 90 tonnes of biomass (fresh weight) per hectare are common. Pieper wants to grow more sugar-beets “because they are an outstanding fit in crop rotation. The sugar-beet also increases the grain maize yield by about 2 tonnes per hectare”. After a storage period of eleven weeks, the biogas producer opened the silage heap – which was in very good condition – in the middle of January. When a reporter for the Biogas Journal was there on the 1st of March, part of the silage had already been fed to the methane bacteria. Upon approaching the remaining heap of silage it still smelled good like lactic fermentation – no areas of mould were visible. The pieces of sugar-beet in the mixed silage also looked very good. At the removal side of the silage, it was apparent how much the stover had been compressed by the compacting. The Claas combine with the Geringhoff maize harvester deposits the maize stover at centre into a windrow beneath the thresher. The chopper comes directly behind to pick up as much of the stover as possible. Do you want to optimise your AD Plant? We have the service! • Service network for faster response times • 7 days a week • For all parts of the process • Repowering increases your gas yields • Our modern components will reduce costs • Higher efficiency without increasing the digester volumes 12th to 14th of December 2017,Nuremberg 12.–14. Dezember 2017, Nürnberg Hall 9 · Stand D41 • Over 400 successfully operating AD wplants world wide • More than 20 AD plants in UK • 20 years experience in planning and construction Service with clear results: Our service makes money for you - a good package to safeguard your investment! 23 Contact us via phone: 01295 688427 or go to www.planet-biogas.co.uk
Page 1 and 2: www.biogas.org German Biogas Associ
Page 3 and 4: Biogas Journal | Autumn_2017 Editor
Page 5 and 6: Biogas Journal | Autumn_2017 Englis
Page 21: Biogas Journal | Autumn_2017 Englis
Page 25 and 26: AD & BIOGAS FEED TECHNOLOGY Biogas
Page 29 and 30: BIOGAS Know-how_3 Biogas Journal |
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