EN ISO 18125:2017
(Main)Solid biofuels - Determination of calorific value (ISO 18125:2017)
Solid biofuels - Determination of calorific value (ISO 18125:2017)
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.
Biogene Festbrennstoffe - Bestimmung des Heizwertes (ISO 18125:2017)
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.
Biocombustibles solides - Détermination du pouvoir calorifique (ISO 18125:2017)
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.
Trdna biogoriva - Določevanje kalorične vrednosti (ISO 18125:2017)
Ta mednarodni standard določa metodo za ugotavljanje bruto kalorične vrednosti trdnega biogoriva pri konstantni prostornini in referenčni temperaturi 25 °C v bombnem kalorimetru, ki je kalibriran s postopkom zgorevanja certificirane benzojske kisline. Rezultat je bruto kalorična vrednost analiznega vzorca pri konstantni prostornini, pri čemer je vsa voda produktov zgorevanja v obliki tekoče vode. V praksi biogoriva izgorevajo pri konstantnem (atmosferskem) tlaku, pri čemer voda ni kondenzirana (odstranjena v obliki hlapov z dimnimi plini) ali je kondenzirana. Pri obeh pogojih je delovna toplota zgorevanja, ki bo uporabljena, neto kalorična vrednost goriva pri konstantnem tlaku. Uporabi se lahko tudi neto kalorična vrednost goriva pri konstantnem tlaku. Podane so enačbe za izračun obeh vrednosti.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2017
1DGRPHãþD
SIST EN 14918:2010
7UGQDELRJRULYD'RORþHYDQMHNDORULþQHYUHGQRVWL ,62
Solid biofuels - Determination of calorific value (ISO 18125:2017)
Biogene Festbrennstoffe - Bestimmung des Heizwertes (ISO 18125:2017)
Biocombustibles solides - Détermination du pouvoir calorifique (ISO 18125:2017)
Ta slovenski standard je istoveten z: EN ISO 18125:2017
ICS:
75.160.40 Biogoriva Biofuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 18125
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 75.160.40; 27.190 Supersedes EN 14918:2009
English Version
Solid biofuels - Determination of calorific value (ISO
18125:2017)
Biocombustibles solides - Détermination du pouvoir Biogene Festbrennstoffe - Bestimmung des Heizwertes
calorifique (ISO 18125:2017) (ISO 18125:2017)
This European Standard was approved by CEN on 6 April 2017.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18125:2017 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 18125:2017) has been prepared by Technical Committee ISO/TC 238 "Solid
biofuels" in collaboration with Technical Committee CEN/TC 335 “Solid biofuels” the secretariat of
which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2017, and conflicting national standards
shall be withdrawn at the latest by November 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 14918:2009.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 18125:2017 has been approved by CEN as EN ISO 18125:2017 without any modification.
INTERNATIONAL ISO
STANDARD 18125
First edition
2017-04
Solid biofuels — Determination of
calorific value
Biocombustibles solides — Détermination du pouvoir calorifique
Reference number
ISO 18125:2017(E)
©
ISO 2017
ISO 18125:2017(E)
© ISO 2017, Published in Switzerland
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ISO 18125:2017(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
4.1 Gross calorific value . 2
4.2 Net calorific value . 3
5 Reagents . 3
6 Apparatus . 4
7 Preparation of test sample . 7
8 Calorimetric procedure . 8
8.1 General . 8
8.2 Preparing the bomb for measurement .10
8.2.1 General procedure .10
8.2.2 Using combustion aid .10
8.3 Assembling the calorimeter .11
8.4 Combustion reaction and temperature measurements .11
8.5 Analysis of products of combustion .12
8.6 Corrected temperature rise θ . 12
8.6.1 Observed temperature rise .12
8.6.2 Isoperibol and static-jacket calorimeters .12
8.6.3 Adiabatic calorimeters .14
8.6.4 Thermometer corrections .14
8.7 Reference temperature .14
9 Calibration .14
9.1 Principle .14
9.2 Calibrant .15
9.2.1 Certification conditions.15
9.2.2 Calibration conditions .15
9.3 Valid working range of the effective heat capacity ε.15
9.4 Ancillary contributions .16
9.5 Calibration procedure .16
9.6 Calculation of effective heat capacity for the individual experiment .17
9.6.1 Constant mass-of-calorimeter-water basis .17
9.6.2 Constant total-calorimeter-mass basis .17
9.7 Precision of the mean value of the effective heat capacity ε . 18
9.7.1 Constant value of ε . 18
9.7.2 ε as a function of the observed temperature rise .19
9.8 Redetermination of the effective heat capacity .19
10 Gross calorific value .19
10.1 General .19
10.2 Combustion .20
10.3 Calculation of gross calorific value .20
10.3.1 General.20
10.3.2 Constant mass-of-calorimeter-water basis .20
10.3.3 Constant total-calorimeter-mass basis .22
10.3.4 ε as a function of the observed temperature rise .23
10.4 Expression of results .23
10.5 Calculation to other bases .23
11 Performance characteristics .24
...
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