Description: Das Projekt "Application of drag reducing additives in district heating systems - Phase 2 -" wird vom Umweltbundesamt gefördert und von Fernwärme-Verbund Saar GmbH durchgeführt. Objective: The application of drag reducing hydrous tenside solutions causes a reduction of drag-dependent pressure losses in the case of turbulent pipe flows. The pressure loss reduction achievable can amount to 80-85 per cent when the medium flows through straight pipes. The drag reducing effect can be used in existing district heating systems to save pump current and to raise supply capacity. When planning new district heating networks investment costs are saved by applying drag reducing additives because in this case system elements (pipes, accoutrements, measuring sensors, etc.) of smaller nominal diameters can be installed. General Information: In 1988 and in 1990 two field tests on a transport duct of the 'District Heating System of the Saar region' having a nominal diameter of DN 450 and a duct length of 1,200 m (connection between the power station Fenne and the central station Voelklingen) were carried out (under contract EC./00072/86/DE). In well-aimed tests programmes executed within the framework of the two-large-scale tests, the transfer from laboratory scale to commercial scale (1: 20) as well as individual system elements, such as heat exchangers, pumps, pipe bends and flow meters, were tested. During these tests, volume flow rate, temperature as well as applied concentrations of drag reducing additives were varied in order to find out an optimal application range and an optimal tenside effect. Since January 1993 a long term test is being carried out in a representative district heating system (a partial system of the district heating network of the Saar region, the network Voelklingen-Luisenthal). The above-mentioned network is equipped with a pipeline of a nominal diameter DN 200. The pipe length amounts to 850 m. It is the objective of this 3rd demonstration test to prove the long-term stability of the additive system used and to check the real applicability of drag reducing additives. In particular, two plate heat exchangers specially designed for tenside application are being tested. The drag reducing additives applied are a mixture of dobone-G and sodium salicylate dissolved in district heating water. The applied concentration of the substances is 1,500 wppm of dobone-G and 720 wppm of sodium salicylate. These concentrations proved to be successful with regard to their effect and range of application both in laboratory tests and during the two preceding large-scale tests. The planned test duration is 1.5 years, however, it is to be prolonged when the application of drag reducing additives turns out to be successful. Achievements: During the execution of the measurements in the district heating network Luisenthal the grag reducing effect of the tensides applied could again be proved. A detailed examination of the variation of the pressure loss with the volume flow rate showed that on average a pressure loss reduction of approx. 60 per cent can be achieved in the test network. Especially in the area of high volume flow rates..
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Völklingen ? Blech ? Fernwärmeversorgung ? Saarland ? Fernwärme ? Messstellennetz ? Sensor ? Temperaturabhängigkeit ? Wärmeversorgung ? Zusatzstoff ? Tensid ? Contracting ? Saar ? Schadensminderung ? Rohrnetz ? Verfahrensoptimierung ? Wärmeübertrager ? Warmwasser ? Fließgeschwindigkeit ? Investitionskosten ? Kontrollsystem ? Pumpe ? Vertrag ? Kraftwerk ? Laborversuch ? Wasser ? Stoff ? Energieeinsparung ? Effektkonzentration ? Energiespeicher ? Rohrfernleitung ? Druckleitung ? Energietransport ? Freilandversuch ? Heizung ? Rohrleitung ? Turbulenz ? Effizienzsteigerung ? Natriumsalicylat ? Wärmetransport ? renewable sources of energy ? Maßstabsvergrößerung ? Luisenthal ? Reibungsminderer ? Druckverlust ? Wärmetransportkapazitaet ? dobone-G ? drag-reducing-effect ?
Region: Saarland
Bounding box: 6.96083° .. 6.96083° x 49.40472° .. 49.40472°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1989-11-06 - 1994-07-31
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