<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The introduction of hydrogen and natural gas blends in existing gas transportation and distribution networks would ensure faster and more efficient decarbonization of energy sector, but, at the same time, this process would request solution of many practical and technical problems. This paper explores thermodynamics of hydrogen and natural gas blend combustion products and estimates the amount of condensate and latent energy recovery from flue gas as a function of condensing temperature. The efficient energy recovery depends on network return temperature, and it is possible to overcome this limitation by implementation of heat pump for extraction of low temperature heat from flue gases. The case study considers operation of heat only boiler and flue gas condenser with integrated cascade of heat pumps, which consist of absorption lithium bromide-water chiller (in heat pump mode) and vapour compression unit. Presented results of energy recovery hence are limited by data collected from the natural gas combustion for district heating network energy supply. However, previous thermodynamic consideration allows extending the obtained results for case of hydrogen and natural gas blend combustion. A proof of concept of heat recovery by combination of flue gas condenser supported by a cascade of heat pumps demonstrates the efficiency in case of hydrogen and natural gas blend combustion.</p>
</abstract>

The introduction of hydrogen and natural gas blends in existing gas transportation and distribution networks would ensure faster and more efficient decarbonization of energy sector, but, at the same time, this process would request solution of many practical and technical problems. This paper explores thermodynamics of hydrogen and natural gas blend combustion products and estimates the amount of condensate and latent energy recovery from flue gas as a function of condensing temperature. The efficient energy recovery depends on network return temperature, and it is possible to overcome this limitation by implementation of heat pump for extraction of low temperature heat from flue gases. The case study considers operation of heat only boiler and flue gas condenser with integrated cascade of heat pumps, which consist of absorption lithium bromide-water chiller (in heat pump mode) and vapour compression unit. Presented results of energy recovery hence are limited by data collected from the natural gas combustion for district heating network energy supply. However, previous thermodynamic consideration allows extending the obtained results for case of hydrogen and natural gas blend combustion. A proof of concept of heat recovery by combination of flue gas condenser supported by a cascade of heat pumps demonstrates the efficiency in case of hydrogen and natural gas blend combustion.

Efficient Heat Recovery from Hydrogen and Natural Gas Blend Combustion Products

Riga Technical University, Faculty of Mechanical Engineering

Transport and Aeronautics, Department of Thermal Power Systems

Riga Technical University, Faculty of Electrical and Environmental Engineering

Riga Technical University, Faculty of Engineering Economics and Management

Latvian Journal of Physics and Technical Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Efficient Heat Recovery from Hydrogen and Natural Gas Blend Combustion Products"}

The introduction of hydrogen and natural gas blends in existing gas transportation and distribution networks would ensure faster and more efficient...

Efficient Heat Recovery from Hydrogen and Natural Gas Blend Combustion Products

Published Online: Apr 15, 2023

Page range: 31 - 42

DOI: https://doi.org/10.2478/lpts-2023-0009

Keywords
Cascade utilization, condensation recovery, heat pumps, hydrogen, natural gas

© 2023 D. Rusovs et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Efficient Heat Recovery from Hydrogen and Natural Gas Blend Combustion Products

Published Online: Apr 15, 2023

Page range: 31 - 42

DOI: https://doi.org/10.2478/lpts-2023-0009

KeywordsCascade utilization, condensation recovery, heat pumps, hydrogen, natural gas

© 2023 D. Rusovs et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Cascade utilization, condensation recovery, heat pumps, hydrogen, natural gas