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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…

Presentation

Characteristics of Ammonia / N2 / O2 Laminar Premixed Flame in Oxygen-enriched Condition

Hiroyuki Takeishi Jun Hayashi Shota Kono Kimio Iino Fumiteru Akamatsu

The problems of ammonia fuel are a low combustion qualities compared with the combustion qualities of hydrocarbon fossil fuels. In this study, the laminar burning velocity was used as the indicator of the combustion quality. Since the laminar burning velocity of ammonia fuel is low compared with that of other fossil fuels, it is necessary to increase the combustion quality in order to utilize the ammonia as an alternative fuel in conventional combustion systems. In this study, the oxygen-enriched combustion was applied to an ammonia/N2/O2 premixed flame for achieving higher burning velocity. The effects of the oxygen-enriched combustion on the…

Presentation

Research and development of NH3-fueled solid-state fuel cell systems

Hiroki Muroyama Jun Yang Kaname Okura Takeou Okanishi Toshiaki Matsui Motohiro Saito Hiroshi Iwai Hideo Yoshida Koichi Eguchi

Ammonia is a prospective carbon-free fuel source for fuel cell systems due to low production cost, ease in liquefaction at ambient temperatures, and high energy density. Furthermore, hydrogen and nitrogen originating from ammonia fuel are expected to have little negative effect on fuel cell performance, while hydrocarbon fuels draws some severe problems at electrodes, such as CO poisoning or carbon deposition in low- and high-temperature fuel cells, respectively. Several technologies can be considered for the ammonia utilization in fuel cell systems. For the utilization of ammonia fuel, we aim to develop a system combined with ammonia decomposition reactor and solid-state…

Presentation

Investigating and Understanding Ionic Ammine Materials

Martin Owen Jones J Hartley Bill David A Porch

Ammonia has been promoted as a viable candidate as an indirect hydrogen fuel vector, due to its high hydrogen content (17.8 wt%) and its ability to store 30% more energy per liquid volume than liquid hydrogen [1]. Ammonia can be safely stored in very high gravimetric and volumetric density in solid state halide materials [2-3], for example, at 109 gL-1 for Mg(NH3)6Cl2 compared to 108 gL-1 for liquid ammonia. These solid state ammonia coordination complexes, known as ammines, have attracted much recent attention (for examples see [4-5] and references there within) with a view to their use as solid state…

Presentation

Development of Fuel Quality Specification for Ammonia when used as a Motor Vehicle Fuel

Allan Morrison

A presentation on the steps needed to start the process of developing an ASTM specification for Ammonia when used as a motor vehicle fuel. What does standard consist of? Minimum quality, harmful contaminants, storage, handling, and safety concerns. The need to indentify or develop standardized test methods. The need for participation by producers (production & distribution), users (OEM’s), general interest groups (government, testing labs), and consumers (fleet owners). Appropriate committee: ASTM, SAE or ISO. Timeframe and hurdles. Volunteers to form an exploratory committee. Discussions? Plans to update the group at the 2015 NH3 Fuel Conference.

Presentation

Life-cycle greenhouse gas and energy balance of community-scale wind powered ammonia production

Joel Tallaksen Fredric Bauer Christian Hulteberg Michael Reese Serina Ahlgren

As well as being an innovative energy source, ammonia is a crucial component of most nitrogen fertilizers. Since the production of ammonia is very energy intensive and currently completely based on fossil energy, there is a considerable interest in developing renewably produced ammonia for use in agriculture and other sectors. This work presents a life cycle assessment (cradle-to-gate) of greenhouse gas (GHG) emissions and primary energy use for ammonia produced at community-scale using renewable wind generated electricity. Two different regions were studied: Minnesota (US) and Sweden. The results show that ammonia produced with wind-generated electricity has significantly lower fossil energy…

Presentation

A novel approach to ammonia decomposition

Bill David

This talk discusses a new type of process for the cracking of ammonia (NH3) that is an alternative to the use of rare or transition metal catalysts. Effecting the decomposition of NH3 using the concurrent stoichiometric decomposition and regeneration of sodium amide (NaNH2) via sodium metal (Na), this represents a significant departure in reaction mechanism compared with traditional surface catalysts. In variable-temperature NH3 decomposition experiments, using a simple flow reactor, the Na/NaNH2 system shows superior performance to supported nickel and ruthenium catalysts, reaching 99.2% decomposition efficiency with 0.5 g of NaNH2 in a 60 sccm NH3 flow at 530 °C.…

Presentation

Student Laboratory Module: Kinetics of Ammonia Cracking

Jason Ganley

The Chemical and Biological Engineering (CBE) Department at the Colorado School of Mines is dedicated to the continual improvement of the laboratory resources made available to those undergraduates enrolled in courses which have major or minor laboratory components. One such course is Kinetics and Reaction Engineering (CBEN 418), offered to undergraduate seniors in the CBE department. Historically, this course has been delivered primarily as a series of traditional classroom lectures with an experimental module (usually one week at the end of the semester) with about 2 hours of participation time per student outside of normal class hours. Previous experimental designs…