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Presentation

Impact of ammonia as a fuel / co-fuel on NOx emissions

Sireesha Aluri Julien Pedel Shannon Groff

Ammonia is a hydrogen-based, carbon-free energy carrier. It has good energy density (22.5 MJ/kg) and can be liquefied (about 10 bar at 298 K). With the increasing demand to lower the CO2 emissions worldwide, pure ammonia combustion or co-combustion with a conventional fuel is an alternative solution in turbines, gas engines, power plants, furnaces, and cement kilns. The major challenges with the use of ammonia as a fuel are lowered heat flux and increased NOx emissions. These parameters were analyzed in Linde’s lab-scale tests with pure ammonia as well as mixtures of ammonia and natural gas. Tests were conducted with…

Article

Ammonia combustion engines: latest research

Julian Atchison September 09, 2021

The journey from the laboratory bench to the shop floor continues apace in 2021, as researchers deepen their understanding of ammonia combustion within engines. The team at Université d’Orléans has published several pieces of research already this year, with interesting results on operating limits, spray characteristics and flame propagation.

Article

Mitsubishi Power developing ammonia combustion boilers

Julian Atchison September 01, 2021

Mitsubishi Power has announced the development of single and mixed-fuel ammonia combustion boilers for industrial applications. Importantly, Mitsubishi also announced that optimal combustion conditions for ammonia have been successfully identified to minimise NOx formation and ammonia slip.

Article

ENGIMMONIA project gets EU funding

Julian Atchison July 21, 2021

Led by RINA with 21 project partners, the ENGIMMONIA project aims to transfer demonstrated, terrestrial clean energy solutions to the maritime sector. As of May, ENGIMONNIA is now fully-funded (€9.5 million) by the EU's Horizon 2020 program. The end result will see the MAN ES ammonia engine installed and demonstrated in three vessels: an oil tanker, a container ship, and a ferry.

Article

Cracking Ammonia: panel wrap-up from the Ammonia Energy Conference

Julian Atchison February 19, 2021

When should we be cracking ammonia? How much should we be cracking? How could better cracking technologies open up new end uses? What are the critical challenges still to be overcome for cracking ammonia? On November 17, 2020, the Ammonia Energy Association (AEA) hosted a panel discussion moderated by Bill David from Science and Technology Facilities Council (STFC), as well as panel members Josh Makepeace from the University of Birmingham, Joe Beach from Starfire Energy, Gennadi Finkelshtain from GenCell Energy, Camel Makhloufi from ENGIE, and Michael Dolan from Fortescue as part of the recent Ammonia Energy Conference. All panelists agreed that cracking technology as it stands has a number of key areas to be optimised, particularly catalyst improvements and energy efficiency. But, successful demonstrations of modular, targeted cracking solutions are accelerating the conversation forward.

Presentation

Starfire Energy's ammonia cracking and cracked gas purification technology

Joseph Beach

Ammonia cracking is important for both combustion and fuel cell applications. Starfire Energy has verified that a blend of 70% ammonia + 30% cracked ammonia can burn well in a conventional natural gas burner with very low ammonia slip and acceptable NOx using a stoichiometric fuel-air mixture. A 10 MW turbine or internal combustion engine using such a blend will need about 1.44 tonnes of cracked ammonia per hour. Starfire Energy’s monolith-supported cracking catalyst may be ideally suited for this application. Fully cracked ammonia retains several thousand parts per million of ammonia due to thermodynamic limitations. Residual ammonia can damage…

Article

Literature Review: Ammonia as a Fuel for Compression Ignition Engines

Stephen H. Crolius March 23, 2020

The diesel engine, also known as the compression ignition (CI) engine, has been a workhorse of the modern energy economy for more than a hundred years. Its role in the coming sustainable energy economy will be determined by its ability to co-evolve with climate-friendly fuels. Two researchers from the National Institute of Advanced Industrial Science and Technology in Japan have now examined the fit between ammonia and the CI engine. Pavlos Dimitriou and Rahat Javaid arrive at a two-part conclusion in their paper, “A review of ammonia as a compression ignition engine fuel,” published in January in the International Journal of Hydrogen Energy. Part one is good news: “Ammonia as a compression ignition fuel can be currently seen as a feasible solution.” Part two is a dose of qualifying reality: to manage emissions of N2O, NOx, and unburnt NH3, “aftertreatment systems are mandatory for the adaptation of this technology,” which means that ammonia-fueled CI engines are likely to be feasible “only for marine, power generation and possibly heavy-duty applications where no significant space constraints exist.”

Presentation

Synthesis and Assessment of Process Systems for Production of Ammonia Using Nitric Oxide in Combustion Exhaust Gas

Hideyuki Matsumoto Shotaro Ogawa Keisuke Kobayashi Tetsuya Nanba Shiro Yoshikawa Taku Tsujimura Hirohide Furutani

Recently, ammonia is regarded as an alternative fuel without carbon dioxide (CO2). Numerous studies have been performed using ammonia as a fuel. Iki and Kurata confirmed the working of a prototype for the ammonia gas turbine, where ammonia burned in an environmentally benign way to generate electricity, exhausting only water and nitrogen [1]. From the view of cycle of ammonia for the development of a society with low carbon, it is required to synthesize carbon-free ammonia (green ammonia) in small plants. This green ammonia can be synthesized using renewable energy, with hydrogen from electrolysis of water and nitrogen from pressure…

Presentation

New Technology of the Ammonia Co-Firing with Pulverized Coal to Reduce the NOx Emission

Takamasa Ito Hiroki Ishii Juwei Zhang Sakiko Ishihara Toshiyuki Suda

Ammonia is recognized as the new energy carrier and it is expected to be introduced into the society in a short time, since the infrastructures related to the ammonia, such as the mass production, transportation and storage are already introduced to produce the fertilizer for the agriculture. There is one technical issue, to use the ammonia in the direct combustion as the fuel for the electric power generation. It is the increase of the NO concentration in the exhaust gas. Ammonia contains the large amount of the nitrogen, comparing with any other fuels that human being has ever treated. Nitrogen…

Presentation

Performance of Ammonia/Natural Gas Co-Fired Gas Turbine with Two-Stage Combustor

Masahiro Uchida Shintaro Ito Toshiyuki Suda Toshiro Fujimori

Ammonia has several advantages as renewable energy career [1-3]. Regarding the manufacturing process, the Harbor-Bosch method is already established. For transportation, ammonia can easily be liquefied at room temperature. Therefore, both transportation and storage are much easier than in case of hydrogen. In utilization, ammonia is combustible and used as a carbon-free fuel. However, ammonia has different combustion characteristics from natural gas. For example, the nitrogen atom contained in ammonia molecule causes high NOx emission through fuel NOx mechanisms [3]. Laminar burning velocity of ammonia is much lower; it might increase unburnt ammonia emission and cause unstable operation of gas…