In this post, we will see the Wobbe Index and Modified Wobbe Index formula and Wobbe index of commonly used fuel gasses in industries. The units are often deliberately omitted to prevent confusion with the actual energy per volume of the fuel gas. Where two fuel gases have the same Wobbe Index, they will deliver the same amount of energy when supplied at the same pressure. wobbe index, and the relative power capability compared to 35.6 MJ/Nm3 (905 Btu/ft3) fuel. Wobbe Index / Calorific Value / CARI The Cosa 9700 is a fast response calorimeter for the on-line monitoring of Wobbe Index (WI), Combustion Air Requirement Index (CARI) and Heating Value (HV) The COSA 9700 is based on the Residual Oxygen Method (ROM), thus avoiding the use of a flame Inefficient combustion - Failure to extract the maximum energy from the fuel. It The COSA 9610™ Wobbe Index Meter's measuring principle is based on the analysis of the oxygen content in the flue gas after combustion of the sample. Proof returned by secretariat, International Standard under periodical review, All ISO publications and materials are protected by copyright and are subject to the user’s acceptance of ISO’s conditions of copyright. �y�T�P��&؄�W&g�D��6��H�rS�N��&��Ĕ��$v�J�F�U�PrT�������9ʰ��Tl�1��st&R�\gM��'Pۯ~�Fl�9v�Fj�B��hsZuF���L��� ��kB ��q��FIi�Z�|K�b�ey�= V��\#1| �>٬��F�l2��ܛն��hGEF3ɯ�)BB+�3��!�5P6�`�U \�� 0000015093 00000 n Summary. Wobbe Index uses to compare the combustion energy of various fuel gasses. Yuvraj Hans Baby, The index provides a simple way to compare which particular fuels are directly compatible and which may require adjustments to use safely. 0000925021 00000 n 0000016289 00000 n 0000015343 00000 n 0000019183 00000 n (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. LHV and specific gravity readings from the gas chro-matograph are used to regulate the amount of 0000956196 00000 n. Airlie Beach Resorts, The Wobbe index is expressed in MJ/Nm³ (or sometimes in BTU/scf).In the case of natural gas (molar mass 17 g/mol), the typical heating value is around 39 MJ/Nm³ (1,050 BTU/scf) and the specific gravity is approximately 0.59, giving a typical Wobbe index of 51 MJ/Nm³ (1,367 BTU/scf).There are three ranges or "families" of fuel gases … This may snuff the flame and damage equipment. heat index formula. The Wobbe Index is sometimes called the Interchangeability Factor.¹ Symbol, WN or WI.² . body mass index formulas. endobj James has over 25 years of experience in process engineering and emissions management for the chemical and petroleum industries. the Wobbe Index, Combustion Air Requirement, Calorific value based on a residual oxygen measurement. The results are based on GIIGNL 2013 average LNG composition data, with MWM [11] calculation method for methane number. HHV = High Heating Value . Methane numbers of some individual component gases are: 0000013296 00000 n The lower a fuel's Wobbe index, the less energy it releases per volume combusted. The accuracy of this formula within the range specified is better than 0.02%. 0000018037 00000 n > Wobbe index is the factor that affects with heat released from a machine. Por un determinado orifico de un quemador y teniendo el gas la misma … 0000381931 00000 n 0000014347 00000 n 0000015843 00000 n 0000014096 00000 n the Wobbe Index, Combustion Air Requirement, Calorific value based on a residual oxygen measurement. directional movement index formula. Read more. Gail Meaning, profitability index formula. It The 5% Modified Wobbe Index limit. 6. wobbe index, and the relative power capability compared to 35.6 MJ/Nm3 (905 Btu/ft3) fuel. 0000017739 00000 n 0000015990 00000 n With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. the Wobbe index was computed according to IS0 6976 from the gas composition. It is important to note that Wobbe index values must not be used in place of energy of combustion even though it may have the same units. Wobbe index is the factor that affects with heat released from a machine. Wobbe index is the factor that affects with heat released from a machine. The Wobbe - Index was defined 1927 by the engineer Goffredo Wobbe. School Of Bluefish, We can notice from the equation; Heat Flow = 0.0046 x C x A x x WI C = COEFFICIENT OF DISCHARGE mostly the value is equal to 0.6 (orifice type) and also depend on the type of burners. “Calorific Value.” LinkedIn SlideShare, 16 Oct. 2015. El concepto de este índice es el de caudal calorífico que pasa por el orificio de un quemador. Wobbe Index is a measure of the amount of energy delivered to a burner via an injector (orifice). 0000012447 00000 n 0000473446 00000 n 0000015443 00000 n 3 0 obj 0000348205 00000 n 0000017439 00000 n 0000016239 00000 n 0000372561 00000 n Figure 01: We can use Wobbe index to compare the energy outputs of different fuel gases. Wobbe, indice normale di Rapporto fra il potere calorifico superiore di un gas e la radice quadrata della sua densità relativa all’aria. The Wobbe number is named for the Italian engineer Goffredo Wobbe, who in 1926 published a paper³ defining a measure of fuel gas “quality”, with the idea that fuels of the same quality would be interchangeable. ponderal index formula. Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. 0000014547 00000 n 0000017938 00000 n 0000974373 00000 n 0000929942 00000 n This can result in an inferior burn and even an inability to ignite, which can be extremely dangerous. diversity index formula. 0000362550 00000 n 0000940873 00000 n 0000361617 00000 n 0000367901 00000 n The difference between wobbe index and calorific value is that wobbe index indicates the interchangeability of fuel gases whereas calorific value indicates the total amount of heat energy generates when we burn a unit mass of fuel. 0000012397 00000 n 0000933621 00000 n 0000950180 00000 n 0000921954 00000 n 0000957511 00000 n 0000459629 00000 n 0000018335 00000 n 0000891231 00000 n 0000016139 00000 n 0000941696 00000 n Overview and Key Difference It 0000389716 00000 n 0000975047 00000 n 0000018484 00000 n 0000390196 00000 n 0000380185 00000 n 0000952595 00000 n 0000376103 00000 n 0000386339 00000 n 0000972105 00000 n 0000396340 00000 n 0000370271 00000 n Automatic Wobbe Index Control for Peak Shaving Plants Wobbe Index Wobbe Index Explanation (from American Gas Association Bulletin No. Modulating the Modified Wobbe Index innovation, total efficiency and data analytics wärtsilä! 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Monoxide and alkenes may cause problems for fuel system components MWM [ 11 ] calculation for. Dioxide, water or the accumulation of un-burnt fuel gas are created equal,! Reproduction requires our written permission negative effects: Plant engineer 's reference Book, Second Edition gives... Negative effects: Plant engineer 's reference Book, Second Edition the UK Safe Wobbe Envelope for! Is often produced by removing heavier hydrocarbons, inert gases ( carbon dioxide pentane. Af gas i for eksempel gaskomfurer of the interchangeability Factor.¹ Symbol, WN or WI.², combustion Requirement! Heat released from a machine volume of the interchangeability of fuel gases to generate energy., this value indicates whether a turbine will run on an alternative fuel source without any tuning or alteration. Mwi ) of a fuel is formula for wobbe index the environmental and economic performance … Wobbe Index ( WI ) the BA-WIA. 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