Carbon Utilization Through Power to Gas and Oxyfuel Combustion Hybridization with Recycled CO2: Design and Preliminary Results

10 Pages Posted: 1 Apr 2021

See all articles by Luis M Romeo

Luis M Romeo

University of Zaragoza - Department of Mechanical Engineering

Manuel Bailera

University of Zaragoza - School of Engineering and Architecture

Pilar Lisbona

ARAID

Begoña Peña

University of Zaragoza - School of Engineering and Architecture

Date Written: March 15, 2021

Abstract

Power-to-gas (PtG) is one of the most promising energy storage technologies. PtG converts surplus (renewable) electricity into synthetic natural gas by combining H2 from water electrolysis with CO2 through methanation reaction. This technology has been proposed for carbon utilization using captured CO2 to produce a ‘CO2 neutral’ natural gas. It allows the temporal displacement (storage) in the use of renewable energy. In theory, the interconnection between the electric and gas grids leads to higher flexibility of the global energy supply.

This work presents the design, construction and testing of a methanation reactor at laboratory scale (1-5 kW of hydrogen input) to make use of the CO2 produced in oxy-fuel combustion. Experimental installation includes a mixer of CO2 and H2 flows coming from bottles, an electrical heater to obtain the temperature needed for the reactor catalyst operation, around 350ºC, a fixed bed tubular reactor filled with Ruthenium based catalyst, an air-cooling jacket for the reactor, a flue gas cooler and water condenser, and several points for the gas analyser, thermocouples and pressure difference devices. In the next set of experimental tests a second catalytic reactor, after the flue gases water condensation, will be included to increase the extent of methanation reaction.

The objective is to characterize the experimental production of synthetic methane under different temperatures, ranging 300-400ºC, and pressures, ranging 1 bara-2bara. The work also includes the evaluation of the methane conversion rates under different CO2 stream impurities (CO and H2O). These impurities are related to the expected flue gas composition that comes from a burner working under oxy-fuel conditions. First results to be presented comprise the design of the lab-scale system together with the economic itemization of the installation and preliminary experimental results of methanation reactor.

Keywords: Power-to-Gas, oxycombustion, methanation, lab-scale facility, experimental tests

Suggested Citation

Romeo, Luis M and Bailera, Manuel and Lisbona, Pilar and Peña, Begoña, Carbon Utilization Through Power to Gas and Oxyfuel Combustion Hybridization with Recycled CO2: Design and Preliminary Results (March 15, 2021). Proceedings of the 15th Greenhouse Gas Control Technologies Conference 15-18 March 2021, Available at SSRN: https://ssrn.com/abstract=3815808 or http://dx.doi.org/10.2139/ssrn.3815808

Luis M Romeo (Contact Author)

University of Zaragoza - Department of Mechanical Engineering ( email )

Zaragoza
Spain

Manuel Bailera

University of Zaragoza - School of Engineering and Architecture ( email )

Calle María de Luna, 3
Zaragoza, 50018
Spain

Pilar Lisbona

ARAID

Av. de Ranillas 1-D
Zaragoza, 50018
Spain

Begoña Peña

University of Zaragoza - School of Engineering and Architecture ( email )

Calle María de Luna, 3
Zaragoza, 50018
Spain

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