Nachhaltigkeit Sustainability neben einer flexibleren Stand-ortwahl auch zu einer deutli-chen Verkürzung der Bauzeit führte. Etwaige Baugenehmi-gungsverfahren entfielen. Die KWKK-Technologie ermög-licht es dem Unternehmen, die gesamte benötigte Prozesskälte zwischen -8 bis -10°C selbst zu erzeugen und die für den Frostvorgang (-28°C) ein-gesetzten Kompressionskälte-maschinen auch mit Elektri-zität des BHKW zu betreiben. Da der dezentral produzierte Strom komplett innerhalb des Betriebs verbraucht werden kann, reduzieren sich die Kos-ten für den Energieeinkauf. Zweiter Standort Aufgrund der wirklich guten Erfahrungen mit der ersten Anlage ließ das fleischverar-beitende Unternehmen eine baugleiche Container-Anlage von Yados an einem zwei-ten Standort installieren, um dort ebenso den Kältebe-darf bei ähnlichem Temperaturniveau zu unterstützen. Da am Nebenstandort keine Tiefkühllagerung erfolgt, die-nen zusätzliche Kompressi-onskältemaschinen nur noch der Versorgungssicherung in Spitzlastzeiten. Nach den vor-liegenden Erfahrungen kann berichtet werden, dass der externe Strombezug an den Wochenenden bei Null liegt und somit eine stromautarke Situation hergestellt werden konnte. Wie effektiv sich das Energieumwandlungsprinzip der KWKK in der Betriebspra-xis einsetzten lässt, zeigt die energetische Gesamtbilanz: Bis zu 50 % des Gesamtbe-darfs an Strom und Kälte er-zeugt das Unternehmen selbst. Gleichzeitig reduziert es seine CO2-Emissionen um jährlich 2.500 t; das entspricht im sel-ben Zeitraum dem Ausstoß von etwa 400 Mittelklassefahr-zeugen. Die Amortisationszeit beider Anlagen liegt zwischen zweieinhalb und drei Jahren. Olaf Besser und Silvio Müller, Yados GmbH; Axel Munsch, EcoEnergyTherm GmbH www.yados.de, www.ecoenergytherm.de Im Containermodul des Blockheizkraftwerks: die linke Motorreihe des V12-Motors mit Abgastrakt und Turbolader./ Inside the container module of the CHP unit: one of V12 engines row, including their exhaust-gas systems and turbochargers, on the left. temperature levels that are nee-ded. The energy professionals will also clarify which type of unit offers the ideal solution for the customer‘s requirements. Energy specialists, such as Yados GmbH in Hoyerswerda/ GER, manufacture both pre-fabricated and modular, tailor made CCHP systems that can be operated with various energy carriers, or sometimes even a combination. To prepare a reliable cost-benefit analysis all relevant operating data, in-cluding legal requirements and government benefits, will be ta-ken into consideration. In-house production A meat-processing company headquartered in North-Rhine Westphalia, Germany, opted for the installation of a CCHP plant. Within the scope of plans to expand production, the com-pany looked into possibilities for covering the future energy demand for cooling at a calcula-ted nominal capacity of 2 MW. Management didn‘t support investment in a fourth transfor-mer station and an additional electrically-powered compres-sion chiller, opting instead for a natural gas operated CHP unit made by Yados combined with an absorption chiller. Techni-cal project management was assigned to Hanover-based EcoEnergyTherm GmbH. As a general contractor with ex-perience in the food industry, the company developed a so-lution ideally matching to the company’s requirements and planned and managed the pro-ject up to commissioning of the system. The company is also responsible for subsequent ser-vicing of the system with 24/7 availability. A modular contai-ner solution was selected for installation, providing more fle-xibility in terms of location and significantly shorter installati-on time as no building permits were required. Using the CCHP unit the com-pany can cover all of its process cooling needs at temperatures between -8 and -10°C in-house and even produce the electri-city needed for the compres-sion chillers used for freezing (-28°C). As the company uses all of its locally produced elec-tricity, it significantly slashed the costs of energy purchasing. Based on the positive experien-ces with its first CCHP unit, the meat-processing company had a second modular container sys-tem of the same type, also made by Yados, installed at a second location to support cooling needs at similar temperature le-vels there. As there is no deep-freeze storage at the secondary site, the additional compression chillers are only used to ensure the security of supply at peak times. According to the empi-rical values now available, the experts can reliably say that the company purchases zero electricity from external sources at weekends, having attained self-sufficiency where electri-city is concerned. The overall energy balance demonstrates how effectively the principle of energy conversion of co-gene-ration can be used in practice; the company produces up to 50 % of its total electricity and cooling needs in-house while reducing its carbon emissions by 2,500 t annually, which corres-ponds to the emissions of around 400 midsized cars over the same period. The ROI of the two units is between 2 1/2 and three years. O. Besser/ S. Müller, Yados GmbH; A. Munsch, EcoEnergy Therm GmbH www.yados.de, www.ecoenergytherm.de generate permanent and relia-ble capacity utilisation of a CHP unit of over 8,500 hours per ye-ar. CCHPs that are integrated into holistic energy concepts allow companies to cover their energy needs while slashing their operating costs. In-house or decentralised production of electricity by companies is also supported by law. Germany’s Combined Heat and Power Act (KWK-G), for example, provi-des incentives for companies that engage in distributed pro-duction of electricity. CCHP unit design The energy needs and energy efficiency of companies in the meat-processing industry also depend on various company-specific factors, the main ones being company size and loca-tion and the type and scope of the range of products, technical infrastructure and production processes. Different conditions of production require different solutions for CCHP units. When planning and projecting a CCHP unit the focus must be on optimum sizing and set up. The experts will include the existing energy supply systems in their considerations and check the available infrastructural inter-faces. By carrying out a needs analysis, they will then deter-mine the specific energy needs and define the areas of use (process cooling/heat, air-con-ditioning, hot and cold water for cleaning etc.) and the required Foto: EcoEnergyTherm 42 3/2015
FT_03_2015
To see the actual publication please follow the link above