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EN ISO 18125:2017

Solid biofuels - Determination of calorific value (ISO 18125:2017)

Edition date: 2017-05-17
In Force
Summary: ISO 18125:2017 specifies a method for the determination of the gross calorific value of a solid biofuel at constant volume and at the reference temperature 25 °C in a bomb calorimeter calibrated by combustion of certified benzoic acid. The result obtained is the gross calorific value of the analysis sample at constant volume with all the water of the combustion products as liquid water. In practice, biofuels are burned at constant (atmospheric) pressure and the water is either not condensed (removed as vapour with the flue gases) or condensed. Under both conditions, the operative heat of combustion to be used is the net calorific value of the fuel at constant pressure. The net calorific value at constant volume may also be used; formulae are given for calculating both values. General principles and procedures for the calibrations and the biofuel experiments are presented in the main text, whereas those pertaining to the use of a particular type of calorimetric instrument are described in Annexes A to C. Annex D contains checklists for performing calibration and fuel experiments using specified types of calorimeters. Annex E gives examples to illustrate some of the calculations.

Dieses Dokument legt ein Verfahren zur Bestimmung des Brennwertes eines biogenen Festbrennstoffes bei konstantem Volumen und bei einer Referenztemperatur von 25 °C in einem Bombenkalorimeter fest, das durch die Verbrennung zertifizierter Benzoesäure kalibriert wurde. Das erhaltene Ergebnis ist der Brennwert einer Analysenprobe bei konstantem Volumen, wobei das gesamte Wasser in den Verbrennungsprodukten in flüssigem Zustand vorliegt. In der Praxis werden biogene Brennstoffe bei konstantem (atmosphärischem) Druck verbrannt, wobei eine Kondensation des Wassers entweder nicht stattfindet (d. h. Wasser wird als Wasserdampf zusammen mit den Abgasen abgeführt) oder stattfindet. In beiden Fällen ist die anzuwendende wirksame Verbrennungswärme der Heizwert des Brennstoffes bei konstantem Druck. Der Heizwert bei konstantem Volumen darf ebenfalls angewendet werden; im vorliegenden Dokument sind Gleichungen zur Berechnung beider Werte angegeben. Die bei den Kalibrierungen und Prüfungen von biogenen Brennstoffen allgemein angewendeten Prinzipien und Verfahren sind im Hauptteil dieses Dokuments dargelegt, während Prinzipien und Verfahren im Zusammenhang mit der Anwendung spezieller Kalorimeter Typen in den Anhängen A bis C beschrieben sind. Anhang D enthält eine Checkliste zur Durchführung der Kalibrierungen und Brennstoffprüfungen unter Anwendung bestimmter Kalorimeter Typen. Im Anhang E sind Berechnungsbeispiele angegeben.

ISO 18125:2017 spécifie une méthode de détermination du pouvoir calorifique supérieur à volume constant d'un biocombustible solide et à une température de référence de 25 °C dans une bombe calorimétrique étalonnée par combustion d'acide benzoïque certifié. Le résultat obtenu est le pouvoir calorifique supérieur de l'échantillon pour analyse à volume constant avec toute l'eau des produits de combustion à l'état liquide. En pratique, les biocombustibles sont soumis à combustion à pression (atmosphérique) constante et l'eau est condensée ou non (s'évapore avec les gaz de combustion). Dans les deux cas, la chaleur effective de la combustion à utiliser est le pouvoir calorifique inférieur du combustible à pression constante. Le pouvoir calorifique inférieur à volume constant peut également être utilisé; des formules sont indiquées pour le calcul des deux données. Les principes et les modes opératoires généraux relatifs aux essais d'étalonnage et aux essais sur les biocombustibles sont présentés dans le corps du texte du présent document, alors que ceux relevant de l'utilisation d'un type particulier d'instrument calorimétrique sont décrits aux Annexes A à C. L'Annexe D spécifie des listes de contrôle pour réaliser l'étalonnage et les essais sur les combustibles à l'aide de modèles de calorimètres spécifiés. L'Annexe E fournit une série d'exemples illustrant certains des calculs.
ICS: 27.190-Biological sources and alternative sources of energy, 75.160.40-Biofuels
CTN: CEN/TC 335 - 19930

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