Influence of Geometrical Features of Solid Biofuels on the Implementation of the Combustion Process

2022 ◽  
pp. 1-18
Author(s):  
Artur Kraszkiewicz
Keyword(s):  
Combustion Process ◽  
Solid Biofuels ◽  
Geometrical Features

scholarly journals Evaluación energética de biocombustibles sólidos elaborados a partir de mezclas de biomasa lignocelulósica

2020 ◽  
Vol 4 (2) ◽  
pp. 33
Author(s):  
Irene Carolina Beltrón Vinces ◽  
Holger Eugenio Palacios Bravo ◽  
Ernesto Rosero Delgado
Keyword(s):  
Energy Content ◽  
Combustion Process ◽  
Calorific Value ◽  
Single Type ◽  
Peanut Shell ◽  
Corn Stalk ◽  
Fixed Carbon ◽  
Solid Biofuels ◽  
Mixed Biomass ◽  
Lignocellulosic Residue

  the purpose of this work is to determine the energy capacity of solid biofuels (pellets) made from the mixture of lignocellulosic biomass. The residues used were peanut husk (Arachishypogaea) and corn stalk (Zea mays L.) present in different proportions in a total of five mixtures. The highest calorific value obtained (30534,89kJ / kg) was that of mixture 4 in proportions of peanut shell and corn stalk 25:75 respectively with an ash production of 9,49% and a fixed carbon content of 26,18% results that favor the efficiency of the pellet in the combustion process (Tmax = 787 ± 13°C) while the mixture 1 (100% peanut shell) obtained the lowest energy content (M1: 28191,06 kJ / kg) With the results obtained, it was determined that pellets made from mixed biomass have better properties than those manufactured by a single type of lignocellulosic residue.   Index Terms— ash, biomass, caloric power, fixed carbon, pellets.

scholarly journals Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2257
Author(s):  
Joanna Wnorowska ◽  
Szymon Ciukaj ◽  
Sylwester Kalisz
Keyword(s):  
Thermogravimetric Analysis ◽  
Ignition Temperature ◽  
Combustion Process ◽  
Fuel Additive ◽  
Isothermal Model ◽  
Air Atmosphere ◽  
Solid Biofuels ◽  
Different Types ◽  
Kinetics Of ◽  
State Kinetic

The paper presents the combustion profile of selected fuels as a result of thermogravimetric analysis. The main purpose of this study was to investigate a mixture of different types of fuel and the influence of the use of a fuel additive on the combustion process profile. As a fuel additive, halloysite was used to investigate the thermogravimetric profiles. It was confirmed that the main combustion parameters such as ignition temperature, burnout temperature, and maximum peak temperature correlated accordingly with different combustibility indices such as the ignition index, the burnout index, and the combustion indices. Furthermore, the present study provided a comparison of selected methods for analyzing non-isothermal solid-state kinetic data and investigated the kinetics of thermal decomposition to describe the ongoing process. Two non-isothermal model methods (Kissinger and Ozawa) were used to calculate the Arrhenius parameters. The effect of heating rate and the addition of halloysite as a fuel additive on decomposition were studied.

scholarly journals Petrographic and Chemical Research on Furnace Wastes From Individual Heating Furnaces and Boilers – Method for Identification of Co-Burning Municipal Waste

2020 ◽  
Vol 3 (1) ◽  
pp. 110-119
Author(s):  
Wojciech Szulik ◽  
Iwona Jelonek
Keyword(s):  
Organic Compounds ◽  
Brown Coal ◽  
Toxic Metals ◽  
Combustion Process ◽  
Municipal Waste ◽  
Solid Fuels ◽  
Chemical Research ◽  
Energy Carriers ◽  
Heating Furnaces ◽  
Solid Biofuels

AbstractNumerous varieties of solid fuels have been employed for the production of heat in buildings and during cooking by utilizing furnaces and boilers. The most commonly used energy carriers include hard and brown coal, coke, and wood-based solid biofuels in the form of various types of pellets, briquettes, and chips. Notably, furnace and boiler users can combine these fuels in any way by changing their proportions. Generally, users of furnaces and boilers are known to co-burn solid fuels and various types of municipal waste. However, the municipal waste contains a number of organic compounds and toxic metals that can be released into the atmosphere during the combustion process; this poses a threat to the health of the environment and public. Herein, chemical and petrographic tests were performed to study the sources of furnace wastes. This research facilitates the identification of unacceptable substances such as plastics, metal filings, and glass.

scholarly journals Impact of Ignition Technique on Pollutants Emission during the Combustion of Selected Solid Biofuels

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2664 ◽  
Author(s):  
Artur Kraszkiewicz ◽  
Artur Przywara ◽  
Alexandros Sotirios Anifantis
Keyword(s):  
Fossil Fuels ◽  
Initial Period ◽  
Combustion Process ◽  
Operating Conditions ◽  
So2 Emissions ◽  
Top Down ◽  
Operational Conditions ◽  
Solid Biofuels ◽  
Pollutants Emission ◽  
The Impact

Nowadays, heating using wood, briquettes, or pellets is a curious replacement to fossil fuels such as coal, oil, or gas. Unfortunately, the combustion of biofuels, especially in low-power boilers with unstable operating conditions, releases a lot of gas pollutants (e.g., carbon monoxide (CO), nitric oxide (NO), and various organic compounds) that are usually generated due to the incomplete product combustion. The combustion of biofuel in grate boilers with top-down ignition is a new approach, popular in society (mainly used for coal fuels), which improves the combustion process and reduces the amount of pollutants emitted. This study evaluated the impact of ignition techniques on the emission level of gas pollutants during the combustion of wood logs, briquettes, and pellets of pine in grate-based charging boilers. The combination of top ignition mode with pinewood logs allowed us to achieve a reduction of 6% in CO and sulfur dioxide (SO2) emission into the atmosphere. However, the combination of top-down ignition mode with pellets and briquettes produced, in fully operational conditions, 1- to 18-fold higher levels of CO and SO2 respectively, than bottom-up ignition, after an initial period of low level CO and SO2 emissions. During the tests (mainly with ignition from top), substantial emissions of NO were observed of up to 400 mg·m−3 at 10% O2. Therefore, further research is required to decrease emission related to the content of nitrogen in biomass. In this respect, research of impact on the combustion temperature of such emissions is needed.

Emmission of Sulphur Oxides from Agricultural Solid Biofuels Combustion

2020 ◽  
Vol 24 (4) ◽  
pp. 35-45
Author(s):  
Artur Kraszkiewicz ◽  
Francesco Santoro ◽  
Simone Pascuzzi
Keyword(s):  
Physical Properties ◽  
Wheat Straw ◽  
Energy Use ◽  
Combustion Process ◽  
Chemical Properties ◽  
Solid Biofuels ◽  
Low Emission ◽  
High Efficient ◽  
Different Types ◽  
Sulphur Oxides

AbstractIn the aspect of the course and analysis of products of biomass fuels combustion in grill feed boilers, the combustion process of wheat straw and meadow hay were assessed taking into consideration conditions of SO2 emission. Different types of briquettes used in the research not only had various chemical properties but also physical properties. In the aspect of assessment of energy and organic parameters of the combustion process, the sulphur content in biomass becomes a significant factor at its energy use. Registered emission during combustion of meadow hay biomass referred to wheat biomass was for A and B type briquettes correspondingly higher by ca. 320 and 120%. Differences in SO2 emission at combustion of various biofuel forms in the aspect of the relation with the remaining combustion parameters including mainly with air flow require, however, further research that leads to development of low-emission and high-efficient biofuel combustion technologies in low-power heating devices.

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

Experimental and Numerical Analysis of a Motorcycle Air Intake System Aerodynamics and Performance

2020 ◽  
Vol 17 (1) ◽  
Author(s):  
M. A. Abd Halim ◽  
N. A. R. Nik Mohd ◽  
M. N. Mohd Nasir ◽  
M. N. Dahalan
Keyword(s):  
Combustion Process ◽  
Three Dimensional ◽  
Engine Performance ◽  
Internal Flow ◽  
Rapid Expansion ◽  
Navier Stokes ◽  
Turbulent Fluctuation ◽  
Ansys Fluent ◽  
Induction System ◽  
Acceleration And Deceleration

Induction system or also known as the breathing system is a sub-component of the internal combustion system that supplies clean air for the combustion process. A good design of the induction system would be able to supply the air with adequate pressure, temperature and density for the combustion process to optimizing the engine performance. The induction system has an internal flow problem with a geometry that has rapid expansion or diverging and converging sections that may lead to sudden acceleration and deceleration of flow, flow separation and cause excessive turbulent fluctuation in the system. The aerodynamic performance of these induction systems influences the pressure drop effect and thus the engine performance. Therefore, in this work, the aerodynamics of motorcycle induction systems is to be investigated for a range of Cubic Feet per Minute (CFM). A three-dimensional simulation of the flow inside a generic 4-stroke motorcycle airbox were done using Reynolds-Averaged Navier Stokes (RANS) Computational Fluid Dynamics (CFD) solver in ANSYS Fluent version 11. The simulation results are validated by an experimental study performed using a flow bench. The study shows that the difference of the validation is 1.54% in average at the total pressure outlet. A potential improvement to the system have been observed and can be done to suit motorsports applications.

Investigations of combustion process in stove fired on biomass

2004 ◽  
Author(s):  
Dragoslava D. Stojiljkovic ◽  
Vladimir V. Jovanovic ◽  
M. Radovanovic ◽  
Nebojsa G. Manic ◽  
Ivo R. Radulovic ◽  
...  
Keyword(s):  
Combustion Process

Optimization of a New Reactive Force Field for Silver - Based Materials

2020 ◽  
Author(s):  
Clément Dulong ◽  
Bruno Madebène ◽  
Susanna Monti ◽  
Johannes Richardi
Keyword(s):  
Force Field ◽  
Self Assembled Monolayers ◽  
The Novel ◽  
Reactive Force ◽  
Reactive Force Field ◽  
Energetic Properties ◽  
Extended Training ◽  
Geometrical Features ◽  
Assembled Monolayers ◽  
Gold Thiolate

<div><div><div><p>A new reactive force field based on the ReaxFF formalism is effectively parametrized against an extended training set of quantum chemistry data (containing more than 120 different structures) to describe accurately silver- and silver-thiolate systems. The results obtained with this novel representation demonstrate that the novel ReaxFF paradigm is a powerful methodology to reproduce more appropriately average geometric and energetic properties of metal clusters and slabs when compared to the earlier ReaxFF parametrizations dealing with silver and gold. ReaxFF cannot describe adequately specific geometrical features such as the observed shorter distances between the under-coordinated atoms at the cluster edges. Geometric and energetic properties of thiolates adsorbed on a silver Ag20 pyramid are correctly represented by the new ReaxFF and compared with results for gold. The simulation of self-assembled monolayers of thiolates on a silver (111) surface does not indicate the formation of staples in contrast to the results for gold-thiolate systems.</p></div></div></div>

Sign in / Sign up

Export Citation Format

Share Document