The Direct Effect of Enriching the Gaseous Combustible with 23% Hydrogen in Condensing Boilers’ Operation

Răzvan Calotă (), Nicolae N. Antonescu, Dan-Paul Stănescu and Ilinca Năstase
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Răzvan Calotă: Department of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 020396 Bucharest, Romania
Nicolae N. Antonescu: Department of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 020396 Bucharest, Romania
Dan-Paul Stănescu: Department of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 020396 Bucharest, Romania
Ilinca Năstase: Department of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 020396 Bucharest, Romania

Energies, 2022, vol. 15, issue 24, 1-12

Abstract: Following the international trend of using hydrogen as combustible in many industry branches, this paper investigates the impact of mixing methane gas with 23% hydrogen (G222) on condensing boilers’ operation. After modeling and testing several boilers with heat exchange surface different designs, the authors gathered enough information to introduce a new concept, namely High-Performance Condensing Boiler (HPCB). All the boilers that fit into this approach have the same operational parameters at nominal heat load, including the CO 2 concentrations in flue gases. After testing a flattened pipes condensing boiler, a CO 2 emission reduction coefficient of 1.1 was determined when converting from methane gas to G222 as combustible. Thus, by inserting into the national grid a G222 mixture, an important reduction in greenhouse gases can be achieved. For a 28 kW condensing boiler, the annual reduction in CO 2 emissions averages 1.26 tons, value which was experimentally obtained and is consistent with the theoretical evaluation.

Keywords: CO 2 emissions; hydrogen (H 2 ) combustible; energy efficiency; decarbonization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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