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Presentation

Nitrogen-Based Fuels: Renewable Hydrogen Carriers

Gideon S. Grader Michael Epstein Ayillath Deepa Oren Elishav Gennady E. Shter Bar Mosevitzky

Renewable energy sources such as solar and wind suffer from an intermittent power output, making energy storage a key element in future energy infrastructure. Fuels offer both high energy densities and efficient transport compared to other energy storage alternatives. One energy storage solution is water electrolysis. However, the generated hydrogen is incompatible with the global fuel infrastructure, inhibiting its implementation as an energy vector. Storing hydrogen on carrier atoms provides a safe and convenient way to utilize and transport renewable energies. While carbon–based fuels are commonly suggested, using nitrogen as a hydrogen carrier can potentially offer a superior option. In…

Article

Ammonia Turbine Power Generation with Reduced NOx

Trevor Brown October 06, 2016

A common concern with ammonia fuel is that NOx emissions will be too high to control. However, in new research from Turkey, USA, and Japan, presented at this year's NH3 Fuel Conference in September 2016, two things became clear. First, NOx emissions can be reduced to less than 10ppm by employing good engineering design and exploiting the chemical properties of ammonia, which plays a dual role as both the fuel and the emissions-cleanup agent. Second, the deployment of ammonia-fueled turbines for power generation is not only feasible, but actively being developed, with demonstration units running today and improved demonstration projects currently in development.

Presentation

Combustion characteristics of ammonia/air flames for a model swirl burner and an actual gas turbine combustor

Akihiro Hayakawa K.D. Kunkuma A. Somarathne Ekenechukwu Chijioke Okafor Taku Kudo Osamu Kurata Norihiko Iki Hideaki Kobayashi

Ammonia is expected not only as hydrogen energy carrier but also as carbon free fuel. For an industrial use of ammonia combustor, ammonia flame stabilized on a swirl combustor should be clarified. However, in order to realize an ammonia-fueled combustor, there are some issues to be solved, such as a difficulty of flame stabilization and reductions of NOx and ammonia emission. In this study, stabilization and emission characteristics of ammonia / air flames stabilized by a model swirl burner are investigated. The outer and inner diameters of the swirler are 24 mm and 14 mm, respectively, and the swirl number…

Presentation

NOx emission analysis and flame stabilization of ammonia-hydrogen-air premixed flames

Hadi Nozari Arif Karabeyoğlu

Based on its well-known merits, ammonia has been gaining special attention as a potential renewable energy carrier which can be replaced in power generation units. One of the major challenges with ammonia as a fuel is NOx emission, which has a complex underlying chemical kinetics. In an earlier chemical kinetics study by the authors, NOx formation sensitivity was thoroughly studied in a wide range of combustion conditions [Nozari & Karabeyoğlu, J.Fuel 2015]. As the next step, premixed ammonia-hydrogen-air flames are studied experimentally in standard temperature and pressure condition. Effects of some major influential parameters on NOx emission levels are investigated:…

Presentation

Power Generation and Flame Visualization of Micro Gas Turbine Firing Ammonia or Ammonia-Methane Mixture

Norihiko Iki Osamu Kurata Takayuki Matsunuma Takahiro Inoue Taku Tsujimura Hirohide Furutani Hideaki Kobayashi Akihiro Hayakawa

A demonstration test with the aim to show the potential of ammonia-fired power plant is planned using a micro gas turbine. 50kW class turbine system firing kerosene is selected as a base model. A standard combustor is replaced to a prototype combustor which enables a bi-fuel supply of kerosene and ammonia gas. Diffusion combustion is employed to the prototype combustor due to its flame stability. 44kW power generation was achieved by 100% heat from ammonia gas. Although NOx concentration in the exhaust gas of ammonia combustion exceeded 500ppm, NOx removal equipment reduced NOx concentration below 10ppm. Over 30kW power generation…

Article

Displacing Diesel Fuel with Carbon-Free Anhydrous Ammonia

Trevor Brown September 15, 2016

The team at the University of Minnesota announced last month the award of funding for a demonstration project entitled "Clean Vehicles Fueled by Hydrogen from Renewable Ammonia." This project builds on years of research and investment in renewable ammonia at University of Minnesota, most visibly the prototype wind-to-ammonia production plant operating since 2014 at West Central Research and Outreach Center. Their focus now, however, is shifting to the use of ammonia as a fuel. "The overall objective of the project is to displace up to 50% of the diesel fuel used in tractors with anhydrous ammonia produced from renewable resources."

Presentation

Enhancement of reaction and stability of ammonia flames using hydrogen addition and swirling flow

Akihiro Hayakawa Akinori Ichikawa Yoshiyuki Arakawa Taku Kudo Hideaki Kobayashi

Enhancement of reaction and stability of ammonia flames using hydrogen addition and swirling flow Akihiro Hayakawa*, Akinori Ichikawa, Yoshiyuki Arakawa, Taku Kudo and Hideaki Kobayashi, Institute of Fluid Science, Tohoku University

Presentation

Numerical investigation of combustion characteristics of ammonia-air mixtures under high pressure lean conditions

Hadi Nozari Arif Karabeyoğlu

In this numerical study we investigate the combustion characteristics of ammonia-air mixtures at elevated pressure and lean conditions which are encountered in gas turbine combustors. The Konnov mechanism is implemented to predict the laminar burning velocity, autoignition, species concentrations and the sensitivity analysis of ammonia decomposition and laminar flame speed. A laminar premixed freely propagating flame model is implemented to calculate burning velocity, mole fractions of species, and contribution of reactions in molar conversion of specific species. Also a homogenous reactor model is used to analyze the temporal mole fraction of radicals and ignition delay time. Effects of adding hydrogen…

Presentation

Simulation of Fuel Economy of Gasoline-Ethanol-Ammonia Tertiary Fuel Blends for a Series Hybrid Electric Vehicle

Shehan Haputhanthri

With the depletion of petroleum resources around the world, a need to have cleaner and fuel efficient automotive technologies and alternative fuel sources has become prominent. Hybrid electric vehicles and sustainable energy sources have gained a high momentum in fulfilling this requirement. To satisfy both needs ammonia, which has been used for a long period of time as a sustainable and carbon free transport fuel can be combined with hybrid electric vehicles. Ammonia when blended with gasoline can be used as an alternate fuel to power existing internal combustion engines. Such blends similar to ethanol-gasoline fuel blends would provide a…

Presentation

Fundamental Characteristics of Ammonia/Air Premixed Laminar Flames

Akihiro Hayakawa Takashi Goto Rentaro Mimoto Taku Kudo Hideaki Kobayashi

Fundamental flame characteristics must be required for the design of ammonia fueled combustors. However, few studies of ammonia combustion have been conducted. In this study, fundamental ammonia/air premixed laminar flame characteristics, such as NO formation/reduction mechanisms and laminar burning velocity, were experimentally and numerically investigated. NO mole fraction in burned gas from ammonia/air premixed flames were investigated using a stainless-steel nozzle burner. Experiments were conducted at various equivalence ratios and pressures. As a result, NO mole fraction in burned gas reduced with the increase in equivalence ratio and pressure. Formation/reduction mechanisms of NO were numerically investigated. Laminar burning velocity and…