Combustion Research Papers - Academia.edu (original) (raw)

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- Renewable Energy, Energy, Combustion, Palm Shell

A study on the synthesis of black powder (La2NiO4) material using the solution combustion synthesis method at a variation of synthesis temperature of 60, 70, and 80Â°C was carried out. It produces a mass of black powder of 2 grams by four times of synthesis process. Then, material characterization was performed on the black powder samples obtained by using X-ray Diffraction (XRD) to determine the phases formed, Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS) to determine the morphology and analyze the composition elemental on the microscale and Fourier Transform Infra-Red (FTIR) to determine chemical bonds. From the whole black powder sample, XRD analysis showed the phases of Dilantanum Nickel Tetraoxide (La2NiO4), Nickel Oxide (NiO), Lanthanum Oxide (La2O3), and Lanthanum Oxide Ht x-form (La2O3 Ht (x-form)). In addition, it was seen from the visible compositions of the phases that the NiO phase looks more dominant and the variation of the synthesis tem...

- by Nano Sujani
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- Materials Science, Chemistry, Combustion

Flue gas emissions and particle size distribution were investigated during combustion experiments of wood, forest residue and mixtures of these two. The combustion experiments were carried out in a grate fired multi-fuel reactor with and without air staging at stable operation conditions and constant temperature of 850 °C. The overall excess air ratio was held at 1.6, and the primary excess air ratio was 0.8 during air staged experiments. NOx emissions are reduced by air staging. Fly ash particle concentration of forest residues in the flue gas is lower than wood. Aerosols number increased in the staged experiments for fuel blends.

- by Wilson Musinguzi
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- Engineering, Biomass, Combustion, Atmospheric Aerosols
- by John Mackie
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- Engineering, Kinetics, Carbon, Combustion
- by Nedjeljko Peric
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- Engineering, Optimal Control, Computational Modeling, Model Predictive Control
- by Robert Finkelman
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- Geology, Climate Change, Carbon, Combustion

The discrete ordinates method (DOM) and discrete transfer method (DTM) were evaluated from the viewpoints of both predictive accuracy and computational economy by comparing their predictions with exact solutions available from a... more

- by Nuray Kayakol
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- Engineering, Modeling, Combustion, Heat Transfer
- by Massimiliano Kolbe and +1
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- Mechanical Engineering, Chemical Engineering, Combustion, Automotive Engineering
- by Claudio Badini
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- Environmental Engineering, Chemical Engineering, Reaction Mechanisms, Combustion
- by JULIA MOLTO BERENGUER
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- Combustion, Pyrolysis
- by PEDRO BENJUMEA
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- Engineering, Chemistry, Combustion, Performance
- by Arvind Atreya
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- Mechanical Engineering, Chemical Engineering, Chemistry, Carbon Dioxide
- by Richard E Lyon
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- Chemical Engineering, Ergonomics, Human Factors, Combustion
- by Seref Soylu
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- Modeling, Combustion, Engineering Design, Performance
- by Malgorzata Pilawska
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- Mechanical Engineering, Chemical Engineering, Hydrogen, Modeling
- by Satyaban Panigrahi
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- Combustion, Heat Transfer, Large Eddy Simulation, Direct Numerical Simulation
- by Daniel Kline
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- Carbon Dioxide, Combustion, Biology, Ecology
- by Per Tunestål
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- Engineering, Mechanical Engineering, Aerospace Engineering, Combustion
- by ayten Yilmaz Wagner
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- Mechanical Engineering, Chemical Engineering, Combustion, Natural Gas
- by Marzena Rach
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- Environmental Engineering, Mineralogy, Combustion, Scanning Electron Microscopy
- by Mahendra Misra
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- Mechanical Engineering, Chemical Engineering, Carbon, Modeling
- by Steven Beyerlein
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- Mechanical Engineering, Combustion, Fluid Dynamics, Simulation
- by Keshab Shrestha
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- Finance, Engineering, Environmental Engineering, Chemical Engineering
- by Dinu Taraza and +1
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- Combustion
- by Charles Ichoku
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- Environmental Science, Remote Sensing, Biomass, Combustion
- by Morten Seljeskog
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- Engineering, Chemistry, Economics, Combustion
- by Alan Zeng
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- Chemistry, Economics, Combustion, Energy Conservation
- by John Zhou
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- Environmental Engineering, Air Quality, Renewable Energy, Biomass
- by Alberto Mendoza
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- Combustion
- by Anna Reva
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- Climate Change, Climate Change Adaptation, Economic Growth, Carbon

In this paper, the procedure of designing a gas turbine combustion chamber test rig test section operating at atmospheric conditions is described. This test rig can be used to evaluate the effects of geometric variations on the performance of the combustion chamber, as well as determining the flammability, stability and ignition maps, exhaust gas composition and temperature profile, and liner wall temperature. This rig has the potentiality of performing combustion tests with a maximum airflow rate of 800m3/h and preheated air up to 1000K, as well as different types of liquid or gas fuels.

- by Amirhossein AZIMI
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- Combustion, Gas Turbines, Test Rig, Combustion Chamber
- by Maria Luda
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- Materials Engineering, Chemical Engineering, Combustion, Pyrolysis
- by Leonardo Marcílio
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- Engineering, Production, Modeling, Combustion

Smouldering combustion is the driving phenomenon of wildfire in peatlands, like those causing haze episodes in Southeast Asia and Northeast Europe. These are the largest fires on Earth and an extensive source of greenhouse gases, but poorly understood, becoming an emerging research topic in climate-change mitigation. In this work, a series of multistep heterogeneous kinetics are investigated to describe the drying and decomposition in smouldering combustion of peat. The decomposition schemes cover a range of complexity, including 2, 3 or 4-step schemes, and up to 4 solid pseudo-species. The schemes aim to describe the simultaneous pyrolysis and oxidation reactions in smouldering fires. The reaction rates are expressed by Arrhenius law, and a lumped model of mass loss is used to simulate the degradation behaviour seen during thermogravimetric (TG) experiments in both nitrogen and air atmospheres. A genetic algorithm is applied to solve the corresponding inverse problem using TG data from the literature, and find the best kinetic and stoichiometric parameters for four types of boreal peat from different geographical locations (North China, Scotland and Siberia). The results show that at the TG level, all proposed schemes seem to perform well, with a high degree of agreement resulting from the forced optimization in the inverse problem approach. The chemical validity of the schemes is then investigated outside the TG realm and incorporated into a 1-D plug-flow model to study the reaction and the species distribution inside a peat smouldering front. Both lateral and in-depth spread modes are considered. The results show that the drying sub-front is essential, and that the best kinetics is the 4-step decomposition (one pyrolysis, and three oxidations) plus 1-step drying with 5 condensed species (water, peat, α-char, β-char, and ash). This is the first time that the smouldering kinetics and the reaction-zone structure of a peat fire are explained and predicted, thus helping to understand this important natural and widespread phenomenon.

- by Xinyan Huang
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- Combustion, Fire Behaviour, Chemical Kinetics, Wildfires

A conceptual trigeneration system is proposed based on the conventional gas turbine cycle for the high temperature heat addition while adopting the heat recovery steam generator for process heat and vapor absorption refrigeration for the... more

- by Khushi Choudhary
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- Engineering, Mechanical Engineering, Environmental Science, Thermodynamics

A computational fluid dynamics (CFD) modelling study is undertaken integrating the air-fired and oxy-fuel combustion cases for chemical reactions, radiative heat transfer, and gas compositions into a 3-D hybrid unstructured grid CFD code. A swirl injection system is used to achieve the flame stability of the turbulent non-premixed combustible gases. An Eddy Breakup (EBU) combustion model with appropriate empirical coefficients is employed for this study. Validation and comparison of both combustion cases with the experimental data, which conducted on a 100 kW facility unit, were made by comparing the temperature distribution levels and species concentration levels. The oxy-fuel combustion case showed that the flame is obviously concentrated in the central region, and it is not spread inside the furnace compared to the air-fired flame. The swirl effect is certainly used to enhance the turbulent mixing and to achieve the internal recirculation of flames. By switching to oxy-fuel fired...

- by Andrew Kusiak
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- Mechanical Engineering, Chemical Engineering, Combustion Science, Data Mining

Analysis of the operation of boiler plants showed significant deviations of the characteristic operating indicators obtained by the exploitation measurements compared to their design values. In order to reduce the variation of process parameters during the exploitation, in relation to their design values, a selection of relevant process parameters was made, and their impact on the constructional characteristics of the furnace and vice versa were analyzed. It is important to note that a large number of plants never reach the project defined operational parameters in exploitation, so in order to determine the interconnections between the constructional and energy characteristics of the steam boiler furnace, the design and simulation (off design) models were generated. The “design” of the simulation model shows the changes of the selected constructional parameters of the steam boiler furnace depending on the energy-process parameters, while the “off-design” of the simulation model show...

- by Izudin Delic and +1
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- Mechanical Engineering, Modeling, Combustion, Steam Boilers

(POx) Partial Oxidation and Sour Shift Catalyst Applications

- by Gerard Hawkins
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- Chemical Engineering, Combustion, Gasification, Clean Coal Technologies

The objective of this research was to test suitability of the Dumas combustion method to completely substitute the Kjeldahl method in routine laboratory determination of crude protein content in cereals and oilseeds. The validation of the method demonstrated that it is able to determine crude protein content in cereals and oilseeds in an efficient and accurate manner, with a detection

- by Nga Nguyễn
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- Analytical Chemistry, Combustion, Bias, Comparative Study
- by Michael Hannigan
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- Environmental Engineering, Air Quality, Atmospheric Science, Biomass
- by Ashwani Gupta
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- Materials Science, Chemistry, Combustion, Waste Management
- by Juan Angel
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- Renewable Energy, Combustion, Variability, Fluidized Bed

As the waste industry continues to move from a disposal-based system to one based on a combination of recovery options, the need for information on the composition of waste increases and this is reflected by the amount of information on the physical composition of municipal solid wastes that is now available. However, there is far less information on the chemical composition of municipal solid waste. The results from a number of chemical surveys from Europe are compared and show a reasonable degree of agreement, but several problems were identified with the data. Chemical and physical compositional data are combined in a case study example to investigate the flow of key potential pollutants in an integrated solid waste management system that uses materials recycling, composting, incineration and landfilling. This case study has shown that an integrated waste management strategy diverts lead and cadmium away from composting and recycling to incineration, which effectively isolates these elements from the environment through efficient capture of the pollutants followed by secure landfilling or recycling of the residues. However, further work is needed to determine the distribution of mercury in incineration residues and its fate when the residues are landfilled.

- by Coco Goh
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- Environmental Engineering, Recycling, Combustion, Waste Management
- by Sajjad Hossain
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- Engineering, Combustion, Internal Combustion Engines, Marine Diesel Engines

This review covers mainly intumescent coatings, with briefer discussions of non-intumescent organic fire-resistive coatings and cementitious inorganic coatings. Emphasis is placed on the more recent developments, and the more recent patent literature is surveyed. Modeling and optimizing are covered both from basic and applied aspects. The chemistry of the production of a foamed char barrier is discussed. Enhancing the performance by adjuvants and choice of binders is shown to be possible. The important interactions of ammonium polyphosphate with other components such as titanium dioxide are described. Testing is briefly discussed, as are some shortcomings of present-day coatings, such as limited water resistance, and some opportunities for improvement.

- by Edward Weil
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- Materials Engineering, Kinetics, Combustion, Heat Transfer