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ENGLISH ISSUE BIOGAS JOURNAL | AUTUMN_2023 The raw biogas is freed from CO 2 in the six interconnected columns of the pressure swing adsorption system (PSA). tractive that understandably, farmers are not willing to give up the opportunity of self-generation,” notes Wolfgang François. This situation makes it difficult to persuade farmers to supply more gas. Welsch adds, “Although additional on-site electricity generation is actually counterproductive for the energy market.” Current developments, however, should not affect collaboration among the project partners: “In general, our relationship is designed for long-term cooperation,” says François. In 2026 and 2027, the last of the seven plants will exit the EEG (Renewable Energy Sources Act) funding scheme. “The agricultural operators will then essentially face the decision of whether to participate in tenders and invest in new CHP (Combined Heat and Power) technology or to feed everything into our system and not have to worry about anything further.” Operating Experiences A large-scale project like the biogas processing in Bitburg poses high demands on all parties involved, especially in the initial phase. “We gradually connected the seven plants within six months,” says Wolfgang François. The commissioning operation began in February 2020, while the biogas plants were being connected. According to François, this involved coordinating the control systems and smoothly transitioning into regular operation within two months in the autumn. In that connection, there were several challenges to overcome. The main difficulties were posed by coordinating the seven biogas plants and integrating Quality, Innovation & Customised Solutions Our double membrane systems High-frequency welded for ideal weld seam strength Premium-quality, screwed fastening system made of stainless steel clamping plates and reinforced keder edge Individually configured support air supply Verifiable structural analysis for the entire gas storage system according to DIN EN 1991-1-4 TRAS 120 Konform Our motivation Continuous development of our roof and gas storage systems Increasing the efficiency of your biogas plant, e.g. through our LowE technology Optimal advice and technical design of your new gas storage system Professional and quick assembly & service with our own assembly teams Visit us at the BIOGAS Convention & Trade Fair 2023 in Nuremberg in hall 8 at stand B06 dbds – Deutsche Biogas Dach-Systeme GmbH www.dbds-gmbh.de | info@dbds-gmbh.de | +49 2421 59183-0 38
BIOGAS JOURNAL | AUTUMN_2023 ENGLISH ISSUE them into the natural gas network. “In such a complex system, there are many variables to consider,” says Wolfgang François. For example, the compressors at the transfer stations of the biogas plants had to be optimized. “The design in the planning phase is different to operation under real conditions.” With the outbreak of the COVID-19 pandemic, a situation occurred that no one had anticipated: a major consumer of biomethane temporarily halted its industrial production, resulting in the loss of a customer. Demand in the natural gas grid was then so low that the entire plant had to be shut down in the summer of 2021, according to Wolfgang François. This was also due to the fact that not all parts of the Westeifel grid had been completed at that time. In the future, surpluses can be stored and distributed nationally in the grid. Correct Temperature Control of the Gas A particular challenge in the initial phase was also related to the temperature range of the gas: in order to prevent the condensation of raw biogas in the transport pipeline, it is cooled during compression. “However, if the amount of raw gas that is generated exceeds the planned quantity, it needs to be additionally cooled, especially in the summer when the outside temperatures exceed 30 degrees Celsius,” says Wolfgang François. This required special settings on one hand, and on the other hand, additional thermal insulation was implemented to reduce external heat radiation. “These were some of the topics that concerned us the most,” says François. The entire project involved investments of over 14 million euros and was financed through equity, The biomethane is injected into the natural gas grid through a compressor. The picture shows Tobias Kessler, an employee of the participating waste management company Luzia François. Light Inova Green Inova Green Bright Inova Green Dark Inova Green Strong Yellow Green Deep Yellow Green Very Deep Yellowish Green Very Light Green Light Green Moderate Green Brilliant Green Grass Green Vivid Green Strong Yellowish Green Jade Green Deep Yellowish Green Fir Green Very Light Yellowish Green Green Comes in Many Shades Lime Green Light Yellowish Green Moderate Yellow Green Green gases too: biogas, biomethane, hydrogen, SNG, and Water Green Moderate Bluish Green Turquoise Green bioLNG. And we have the technologies to produce them. Check our references. Very Light Bluish Green Vivid Bluish Green Strong Bluish Green Strong Petrol Green Discover more. 39
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