Journal
APPLIED ENERGY
Volume 222, Issue -, Pages 840-846Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.04.034
Keywords
In situ biogas upgrading; Energy storage; H-2; Full-scale biomethanation; Gas-liquid mass transfer; Anaerobic digestion
Categories
Funding
- Innovation Fund Denmark [4106-00017B Electrogas]
- Danish Strategic Research Council [10-093944 HyCon]
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Industrial application of biomethanation is impeded by the slow development of cost effective technologies, which can supply the methanogenic archaea with H-2 both effectively and at sufficient rates in large scale. This paper is the first to present developmental work of a H-2 mass transfer technology in full-scale, investigating the H-2 mass transfer potential of a venturi-type injector through injections of up to 33.5 m(3) H-2 into a 1200 m(3) anaerobic digester under normal operation. The venturi system poses a potentially inexpensive system of in situ biogas upgrading, since it is easily installed on already existing anaerobic digesters. Experimental H-2 consumption rates increased with H-2 injection rates, and was clearly indicated to be limited by the gas-liquid mass transfer rate due to injection of large bubbles. Consumption of the unconverted H-2 was increased by recirculation of the headspace gas, but at lower rates due to dilution of H-2 with biogas. The incomplete H-2 consumption gives the venturi system application in combination with ex situ methanation systems in its present form, but the system must be developed further in order to provide sufficient gas-liquid mass transfer efficiency in order to comprise a stand-alone biogas upgrading system.
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