The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Biodiesel effluent demands treatment to enhance their organoleptic properties and to reduce the levels of organic load and toxicity. A step of coagulation-flocculation using 0.50 mmol L−1 Fe(NO3)3 was applied at the natural pH of the effluent (pH 2.9) removing its turbidity and apparent color. A solar/photo-Fenton process was employed to minimize the chemical oxygen demand – COD, when multiple additions...
The main objective of this work is to evaluate the effects of potassium (K) and calcium (Ca) on the early stages of combustion of single biomass particles. The biomass used was grape pomace, sieved in the size range of 200–250µm. With the pre-treatments of demineralization and impregnation, a total of 12 different samples were obtained: raw grape pomace, demineralized grape pomace and impregnated...
This work investigates both experimentally and numerically turbulent diffusion flames in a laboratory combustor with a slot burner. Experiments were carried out using a mixture of natural gas (75vol.%) and hydrogen (25vol.%) as fuel and three oxidizers with compositions of 35% O2/65% N2, 35% O2/32.5% N2/32.5% CO2 and 35% O2/20% N2/45% CO2. For these three oxidizers, hydroxyl radical chemiluminescence...
Single char particles with a diameter of 8mm were produced in situ from pellets of raw and torrefied pine shell, olive stones and straw. The single char particles were then gasified at 800, 900 and 1000°C in two or three CO2 concentrations at each temperature. In the experiments, CO concentrations were measured from the product gases. From the measured CO concentrations, the char conversions versus...
The general purpose of this work is to evaluate the relationship between the fuel quality and the gaseous and particulate matter (PM) emissions in a domestic boiler fired with five different types of pellets, namely, two commercial pellets from pine residues, commercial pellets from cork residues, and in-house made pellets from olive wood and olive pruning residues. Initially, to evaluate if the pellets...
Currently there is an increasing interest on a new generation of low cost biomass fuels derived from human activities like wood and forestry residues, crop residues and refuse derived fuels (RDF) produced from municipal or industrial solid waste. The main objective of this study is to evaluate the combustion behaviour and ash characteristics of a number of these renewable fuels, namely rice husk,...
The reduction of the dioxin levels in the exhausts of today waste-to-energy plants relies on the control of the thermo-fluid-dynamic processes occurring within the combustion chamber, rather than on policies aimed at restricting the amount of chlorine in the waste material to be treated. This is a consequence of the fact that waste-to-energy plants currently receive the bulk of discarded PVC and other...
This article presents a detailed experimental characterization of the reburning process in a large-scale laboratory furnace. Natural gas, pine sawdust and pulverized coal were used as reburn fuels. Initially, the study involved the collection of in-flame combustion data, without reburning, in order to define appropriate locations for the injection of the reburn fuels. Next, flue-gas data were obtained...
This article describes an experimental study on ash deposition during the co-firing of bituminous coal with pine sawdust and olive stones in a laboratory furnace. The main objective of this study was to relate the ash deposit rates with the type of biomass burned and its thermal percentage in the blend. The thermal percentage of biomass in the blend was varied between 10% and 50% for both sawdust...
The aim of the present work was to evaluate the performance of a pulverized-coal-fired large-scale laboratory furnace with air staging. New data are reported for gas phase species concentration, temperature and particle burnout for two primary zone stoichiometric ratios, 1.15 (unstaged flame) and 0.95 (staged flame), other operating conditions being fixed. The results revealed that the reduction in...
The results of an experimental and modelling study of a lifted, non-premixed methane turbulent free jet flame issuing into still air are presented. Detailed in-flame measurements, including the gas temperature, oxygen and NO concentration distributions, are made. In a parallel computational study, a radiative mixedness–reactedness flamelet combustion model is employed to simulate the experimental...
The finite-volume based commercial CFD-code Fluent was used to simulate the reacting flow in a heavy fuel oil fired laboratory furnace. Both the standard k−ε turbulence model and the Reynolds stress model (RSM) were tested. The combustion model was based on the conserved scalar (mixture fraction) and prescribed probability density function approach. The heavy fuel oil droplet trajectories were predicted...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.