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Magazine: 391 Sep-Oct 2024

The odyssey of green ammonia: optimising levelised cost

Green ammonia production facilities can be situated in remote areas with access to often fully off-grid renewable power supply. This article examines plant concepts and discusses the challenges and solutions for these plant architectures. Through a case study, an efficient and innovative methodology to compare options and optimise the sizing of the plant is presented. The methodology addresses the intermittency of the power production, the flexibility limits of the main process units, and the costs of investment and operation, using proprietary techno-economic dynamic simulation software, Odyssey.

Price Trends

Ammonia benchmarks west of Suez remain supported by limited availability at key regional export hubs amid increased potential for cargoes to arrive from the East, where availability is far healthier, and prices appear under pressure. The disparity in prices was illustrated towards the end of August, when Nutrien sold 25,000 tonnes to multiple buyers in NW Europe for 1H September delivery at $550-555/t c.fr. When netted back to Trinidad, the price marks a sizeable premium on the $375/t f.o.b. last achieved by Nutrien back in late June, although given that last business in Algeria was fixed at $520/t f.o.b., it appears there is room for delivered sales into Europe to move up further. Regional availability is still limited, with extreme weather conditions in the US Gulf and North Africa potentially impacting supply further over the coming weeks.

Double temperature scrubbing for cleaner exhaust air

Casale’s fluid bed granulation tail gas treatment for nitrogen-based fertilizer employs double temperature scrubbing technology, which handles the granulator exhaust air separately from the cooler exhaust air. The technology can combine dust removal with ammonia abatement in the same installation to meet strict tail gas limitations such as 10 mg/Nm3 for dust and 10 mg/Nm3 for ammonia. Ken Monstrey of Casale explains the key features of the Casale scrubbing technology.

A sea change?

In our May/June issue I discussed the race to be the next major green shipping fuel, in which methanol and ammonia both remain significant contenders, but which methanol appeared to be pulling ahead in. But more recently, a few stories from the past few weeks have left me not quite as sure as I was about that. Firstly, there’s the news in our Syngas News section this issue that the FlagshipONE green methanol project in Sweden is being delayed and possibly abandoned, because demand for green methanol for shipping has not actually materialised as fast as was anticipated.