How green is blue hydrogen?

Energy Science and Engineering - Tập 9 Số 10 - Trang 1676-1687 - 2021
Robert W. Howarth1, Mark Z. Jacobson2
1Department of Ecology & Evolutionary Biology Cornell University Ithaca New York USA
2Department of Civil & Environmental Engineering Stanford University Stanford California USA

Tóm tắt

AbstractHydrogen is often viewed as an important energy carrier in a future decarbonized world. Currently, most hydrogen is produced by steam reforming of methane in natural gas (“gray hydrogen”), with high carbon dioxide emissions. Increasingly, many propose using carbon capture and storage to reduce these emissions, producing so‐called “blue hydrogen,” frequently promoted as low emissions. We undertake the first effort in a peer‐reviewed paper to examine the lifecycle greenhouse gas emissions of blue hydrogen accounting for emissions of both carbon dioxide and unburned fugitive methane. Far from being low carbon, greenhouse gas emissions from the production of blue hydrogen are quite high, particularly due to the release of fugitive methane. For our default assumptions (3.5% emission rate of methane from natural gas and a 20‐year global warming potential), total carbon dioxide equivalent emissions for blue hydrogen are only 9%‐12% less than for gray hydrogen. While carbon dioxide emissions are lower, fugitive methane emissions for blue hydrogen are higher than for gray hydrogen because of an increased use of natural gas to power the carbon capture. Perhaps surprisingly, the greenhouse gas footprint of blue hydrogen is more than 20% greater than burning natural gas or coal for heat and some 60% greater than burning diesel oil for heat, again with our default assumptions. In a sensitivity analysis in which the methane emission rate from natural gas is reduced to a low value of 1.54%, greenhouse gas emissions from blue hydrogen are still greater than from simply burning natural gas, and are only 18%‐25% less than for gray hydrogen. Our analysis assumes that captured carbon dioxide can be stored indefinitely, an optimistic and unproven assumption. Even if true though, the use of blue hydrogen appears difficult to justify on climate grounds.

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Tài liệu tham khảo

Bartlett J, 2020, Decarbonized Hydrogen in the US Power and Industrial Sectors: Identifying and Incentivizing Opportunities to Lower Emissions

Reed S, 2021, Hydrogen is One Answer to Climate Change. Getting it is the Hard Part

Voorhis S, 2021, New York to Test Green Hydrogen at Long Island Power Plant

Wang A, 2021, Analyzing Future Demand, Supply, and Transport of Hydrogen

Kahya D, 2020, Unearthed Today: Why Oil Companies Want You to Love Hydrogen

World Energy Council, 2019, New Hydrogen Economy: Hope or Hype?

IEA, 2019, The Future of Hydrogen: Seizing Today's Opportunities

Farmer M, 2020, What Colour is Your Hydrogen? A Power Technology Jargon‐Buster

Hulst N, 2019, The Clean Hydrogen Future has Already Begun

10.1016/j.jpowsour.2005.05.092

10.1021/acs.est.8b06197

Global CSS Institute, 2020, Global Status of CCS

IPCC, 2013, Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change

UNEP, 2021, Global Methane Assessment: Benefits and Costs of Mitigating Methane Emissions

10.1002/ese3.35

Howarth RW, 2021, Environmental Impacts from Development of Unconventional Oil and Gas Reserves

NIST, 2018, NIST Standard Reference Database Number 69

10.1109/MPAE.2004.1359020

EIA, 2016, Carbon Dioxide Emissions Coefficients

SantoroR HowarthRW IngraffeaA.Indirect emissions of carbon dioxides from Marcellus shale gas development.A technical report of the Agriculture Energy and Environment Program at Cornell University;2011.

10.1007/s10584‐011‐0061‐5

10.1126/science.aar7204

10.1029/2019GL082635

10.1080/1943815X.2020.1789666

EIA, 2021, US Natural Gas Production Reaches Record High in 2015, Today in Energy, April 15, 2016

EIA, 2021, US Natural Gas Total Consumption

10.1126/science.aaj2350

10.1038/s41558‐018‐0328‐1

10.1016/j.egypro.2017.03.1533

Government of Alberta, 2020, Quest CO2 Capture Ratio Performance, Quest Carbon Capture and Storage (CCS) Project

10.1039/c9ee02709b

Petra Nova.W.A. Parish Post‐Combustion CO2 Capture and Sequestration Demonstration Project. Final Scientific/Technical Report. DOE‐PNPH‐03311.Petra Nova Parish Holdings LLC;2020.

Schlissel D, 2021, Boundary Dam 3 Coal Plant Achieves Goal of Capturing 4 Million Metric Tons of CO2 but Reaches the Goal Two Years Late

IPCC, 2005, Carbon Dioxide Capture and Storage

10.1039/B809990C

10.1038/s41560‐019‐0365‐7

10.5194/bg‐16‐3033‐2019

10.1002/2014EF000265

10.1073/pnas.1314392110

10.1073/pnas.1805687115

10.5194/acp‐21‐4339‐2021

10.1126/science.1174760

Low SJ, 2021, Climate Imagineering: Practices and Politics of Sunlight Reflection and Carbon Removal Assessment

10.1007/s41247‐020‐00080‐5

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Energy Science and Engineering

Tập 9 Số 10

1676-1687

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