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English Issue Biogas Journal | Spring_2021 Distribution of biogas plants, route of the raw gas pipeline and location of the biogas treatment and feed-in plant in the Bitburg region and key project data Raw gas pipe – approx. 42 km long Biogas plant Biogas treatment plant Key project data Biogas suppliers Biogas collection pipeline There are currently seven biogas plants with up to 900 nm³/h raw gas volume DN 125 … 250, 42 km long Biogas storage capacity 5,300 m 3 Treatment technology Treatment capacity Pressure swing adsorption (PSA) 1,800 nm 3 /h raw gas – 1,000 nm 3 /h biomethane ETW Energietechnik GmbH, located in Moers, is the treatment supplier. Their convincing response to the functional tender of the H. Berg & Partner engineering firm, which was open to all types of technology, offered the lowest energy costs. Dr. Oliver Jende, sales engineer at ETW, emphasises that the ETW SmartCycle ® PSA gas treatment method also features a simple process and high availability (reference plants with 99 percent availability) and it handles changing raw gas qualities and amounts well. “A significant future issue for us and our partners is that we will soon begin marketing biogas as fuel for the public transport of the SWT and for heavy cargo traffic” Wolfgang Francois Jürgen Neuß notes that the main challenge of the planning contract was to optimise the transportation of the raw gas through the 42 kilometre long collection pipeline both technically and with regard to power. The biogas producers deliver the biogas up to this point. Biogaspartner Bitburg GmbH has already begun with the construction and operation of the feed-in plants. At the plant site at the Bitburg airport, the raw biogas is first collected from the gas tank with a capacity of up to 5,300 cubic metres. It consists of about 53 percent methane (CH 4 ) and about 46 percent carbon dioxide (CO 2 ). In addition, it contains low concentrations of oxygen, hydrogen sulphide, nitrogen, etc. To remove pollutants, particularly hydrogen sulphide, an activated carbon filter is located upstream of the biogas treatment plant. This treatment removes primarily CO 2 from the raw biogas. This process is performed in six containers filled with a special activated carbon and subject to pressure in alternation (adsorbers). Pure gas with 98 percent methane content In the first phase, the containers are filled with the raw biogas at a pressure of about 3 bar. The CO 2 molecules in the activated carbon are adsorbed at this pressure. The raw gas flow is removed at a methane content of about 98 percent and transferred to the feed-in station on the natural gas grid. When the pressure then decreases in the second phase of the pressure swing adsorption process, the separated CO 2 is discharged from the adsorbers. The plant is designed to process 1,800 nm³ of raw gas per hour; it is currently running at about half of that load. The plan is to connect up to three more biogas plants to the existing group. Altogether, the biogas from up to 48 biogas plants in the region could be used in a central treatment process. In order to do so, more transport and treatment systems must be constructed. According to information provided by Wolfgang Francois, the initial operating experiences of Biogaspartner Bitburg GmbH have been consistently positive. Currently, fine-tuning is underway. In a few months, the 40
Biogas Journal | Spring_2021 English Issue valuable insights gained from practice will be available. Some of this knowledge will be transferrable to other sites and will become the basis for further project developments. photo: Stadtwerke Trier Versorgungs-GmbH Flexible utilisation of biogas possible Participating farmers have two options for utilising their biogas. One possibility is feeding in the maximum amount, which increases the total amount of green gas produced regionally. Another possibility, however, is that they can still use their CHP system for on-site conversion of the biogas to electricity. This way, they can profit from market developments if less energy can be produced with the fluctuating renewable sources of wind and solar power. This makes them an important component of the regional energy network that the SWT public utility is building. The Stadtwerke Trier public utility is creating the distribution and sales structures so that profitable business models can be created, and in turn, so that the region generates added value and establishes a secure, inexpensive energy supply. The ideas that regional energy provider SWT will realise in the future also include integrating the production of green hydrogen. This will make SWT a pioneer in the implementation of regional interconnection concepts for expanding renewable energies. That`s why it`s no wonder that the minister of the environment for the state of Rhineland-Palatinate, Ulrike Höfken, did not hesitate to attend the official commissioning ceremony on 24 August 2020. Author Marie-Luise Schaller, EUR ING ML Schaller Consulting mls@mlschaller.com www.mlschaller.com Official commissioning of the Bitburg biogas feed-in plant on August 24, 2020. TerraVis needs you! We are looking for international partners who are interested in a trustful and profit able partnership for expert support and ideal products to re-sell. For more information please contact Ian Burgess, One of the experts TerraVis GmbH Industrieweg 110 48155 Münster Mobile +49 17 3 . 54 39 64 3 ian.burgess@terravis-biogas.de www.terravis-biogas.de FIELD SILO FERMENTER ENERGY 41
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