| Autor: |
Palmer, Graham, Dargaville, Roger, Changlong Wang, Hoadley, Andrew |
| Předmět: |
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| Zdroj: |
EA National Conference Publications; 2023, p344-351, 8p |
| Abstrakt: |
Ammonia is one of several essential chemicals that will need to be decarbonised to meet climate mitigation targets. Along with its use in industry, it is an essential component of nitrogen rich fertilisers. Most ammonia is currently produced via steam reforming of natural gas and the Haber-Bosch process, but it can also be produced using renewable electricity via water electrolysis and Haber Bosch. In addition to techno-economic assessment, it is critical that the life cycle environmental impacts of conventional and green production are assessed. We present life cycle greenhouse gas emissions for three scenarios - conventional production via natural gas reforming in the Pilbara; electrolysis via grid electricity including contracted wind power in Tasmania; and electrolysis via grid electricity including contracted wind power in Perth. The destination is Japan via mid-sized refrigerated gas carriers. For electrolysis-based production, we find that greenhouse gas emissions are highly sensitive to plant turndown, the emissions profile of the electricity grid, and whether a market-based or location-based grid accounting methodology is used. Under optimal conditions, the emissions for the Tasmanian scenario may be as low as 7% that of the natural gas based process, up to nearly double the natural gas based process for the Perth scenario. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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