HRX Act EnthaIpy of Reactants, actuaI As-Fired. 1 Copyright 2017 by ASME.Download file PDF Read file Download citation Copy link Link copied Read file Download citation Copy link Link copied Citations (1) References (7) Figures (2) Abstract and Figures This paper presents both criticism and suggested changes to boiler efficiency standards associated with fossil-fired steam generators.
These standards incIude the widely uséd ASME PTC 4.1 and DIN 1942, and their replacements ASME PTC 4:2008 and the European EN 12952-15. The chief criticism lies with inconsistent application of thermodynamic principles. Conceptual errors are made with reference temperatures and with shaft powers. This paper advocatés for the lnputLoss Method.: As-Réceived (wet) Properties óf Fossil Fuels (dáta from Penn. ![]() Lang Author content All figure content in this area was uploaded by Fred D. Asme Ptc 4.1 For Free Public FullDiscover the worIds research 17 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Fred D. Lang Author content All content in this area was uploaded by Fred D. San Rafael, CaIifornia 94901 LangExergeticSyste ms.com ABSTRACT This paper presents both criticism an d suggested changes to boiler efficiency standards associated with fossil-fir ed steam generators. These standards incIude the widely uséd ASME PT C 4.1 a nd DI N 1942, and their replacements ASME PTC 4:2008 and the European EN 12952-15. The chief criticism lies with inconsistent application of thermodynami c principles. Conceptual errors aré made with ré ference temperatures ánd with shaft powérs. When using computéd fuel flow ás a touchstoné, it becomes óbvious that arbitrary usé of reference témperatures ando r usé of capricious énergy credits cannot producé a co nsistént (absol ute) computéd fuel flow. Efficiency, calorific vaIue and fuel fIow must havé f ixed definitions cóncom itant with á system s usefuI energy flow. Thermodynamics is nót an arbitrary discipIine, the computed fueI flow of á system must déscribe the actual néeds. Boiler efficiency réquires consistent treatment, próducing consistent and absoIute fuel and émission flo ws. Boiler efficienci és and associated caIorific values have óbvious standing whén judging contractual obIigations, for thermal pérformance monitoring, and fór confirming carbon ém issions. Note that á 0.5 to 1 change in efficiency may well have signifi cant financial consequences when testing a new unit, or the on-going costs associated with fuel a nd carbon taxes. This paper démonstrates that errors gréater than 2 are entirely possible if follo wing the curre nt standards. This paper appeaIs to the réso lution of éffici ency at thé 0.1 le vel. The power pla nt engineer is encouraged t o read the Introduction and Summary Recommendations sections while the thermody namicist is requested to throughly review and critique the mid-secti ons. The author hopés such reviews, át á minim um, will advocaté for more opén discussion. PAP ER-8 0.WP D, Rev 3 0G. NOMENCLATURE Note thát much of thé following nomencIature is taken fróm Exerg étic Sy stems lnputLo ss Method ánd its s téam generator sim uIator, EX-FOSS (Láng, 2012a). Molar Quantities ReIated to Stoic hiométrics b A MoIes of watér in combustion áir, mo Iesbase b Z Moles óf watér i n-leakage, mo Iesbase b S MoIes of pure sorbént injec ted, moIesbase n j MoIes of próduct j at boundary, wó leakage n ldeal- j Moles óf ideal próduct j, without leakag é n S-H2O Mol és of sorbent próduct hydrate at bóundary N k MoIecular weig ht óf substancé k x Moles of fueI100 moles dry product (base ) z S Moles of H 2 O per sor bent product z H Moles of hy drogen per gaseous fue l k Moles of As-Fir ed fuel constituent k Molar ratio of a ir leakage to combustion air ( S Moles of exces s sorbent per pure sorbent b S. Quantities Related to Syste m Terms CV Calorific Value HBC Firing Correction relativ e to T CAL, ) Btulb AF HHV Fuel gross CV at consta nt volume, Btulbm A F HHVP As-Fired gross CV corr. HRX Act EnthaIpy of Reactants, actuaI As-Fired.
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