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.
A case study was carried out to investigate the bed agglomeration observed in a fluidized bed incinerator when burning blends of three wastes (carbon soot, biosludge and fuel oil). Several instrumental approaches were employed (i.e. XRF, SEM, XRD, and ICP-AES) to identify the bed materials (fresh sand and degrader sand) and clinkers formed in the full-scale incinerator tests. Several elements (V,...
The effect of leaching coal samples from Boragolai and Ledo collieries of Makum coal fields, Assam, situated in north eastern region of India with potassium hydroxide solution alone at 95 and 150 o C as well as followed by mild acid on demineralization and desulphurization was investigated. Potassium hydroxide alone leads to 2-19% demineralization and 16-30% desulphurization of the coal samples...
The reduction of nitric oxide by urea has been investigated experimentally in the presence of various additives using a well-stirred laboratory reactor operated from 900 to 1450K at atmospheric pressure. The influence of injecting various oxygenated organic compounds on the maximum NO reduction has been discussed, as well as the possibility of widening the range of temperature where the NO x ...
Steam gasification studies were carried out in an atmospheric fluidised bed. The gasifier was operated over a temperature range of 700-900 o C whilst varying a steam/biomass ratio from 0.4 to 0.85w/w. Three types of forestry biomass were studied: Pinus pinaster (softwood), Eucalyptus globulus and holm-oak (hardwood). The energy conversion, gas composition, higher heating value and gas yields...
Two leonardite benches occur in the lignite basins of Achlada (NW Greece) and Zeli (Central Greece). In this study, we present some initial results concerning chemical composition (C, H, N and S), kind of inorganic matter, contents of free-humic acids, and the petrological features. Both samples are classified as lignites and display similar values of carbon contents. The Zeli-sample displays higher...
An experimental study has been conducted to determine the ignition temperature of biomass at 21% O 2 , both under pulse ignition conditions and under thermogravimetric conditions. In the pulse ignition experiments, samples of about 2g wheat straw were placed in an isothermal reactor. The ignition temperature was determined from the transient CO and CO 2 profiles to approximately 255...
The chemical structure of Estonian kukersite kerogen is evaluated using a simulation of 13 C MAS NMR spectrum. A reasonable fit to the experimental NMR spectrum is obtained by assuming a model of the geomacromolecule with empirical formula C 421 H 638 O 44 S 4 NCl and a set of structural elements comprising mainly alkylated phenolic...
Copper oxide supported on activated carbon catalysts, obtained by various preparation techniques, are compared in methanol decomposition to hydrogen and carbon monoxide. The favourable role of copper deposition from ammonia solution of copper carbonate is proved. The effect of the preparation conditions on the catalysts activity and stability as well as on the nature of the catalytic active complexes...
The liquefied petroleum gas (LPG) is generally considered to be eco-friendly viable fuel not only in domestic sector but also for transport sector. The inhibition of LPG-air premixed flames is a very important practical problem that has received relatively little attention. This paper is concerned with experimental determination of the flammability limits of LPG-air mixture. The standard procedure...
The experimental study and thermodynamic equilibrium calculations were performed to investigate the interactions of fuel-based lead, copper, zinc, and manganese with the bed material of the bubbling fluidised bed boiler (BFB) during the co-combustion of sawdust, peat, and refuse-derived fuel. Flue gas trace element measurements, a chemical analysis of process streams, and mass balance calculations...
Coal, char and activated char doped with model vanadium compounds (V 2 O 5 and NH 4 VO 3 ) and petroleum coke ash, PCA, (main metal components: V, Fe and Ni) have been tested as catalytic sorbents for NO reduction without the addition of a reduction reactive. The sorbents prepared have shown to be active for NO reduction at temperatures higher than 350 o C....
In this paper, Yangquan anthracite was separated into three different coal lithotypes in terms of density. The effect of high-temperature crystallite growth on char combustion of coal is characterized. It shows that there is large difference between the combustion characteristics of the two lithotypes of coal (one is <1.55g/ml of density and the other is 1.55-1.855g/ml), and that the development...
A vacuum technique is established for oil spill cleanup. It consists of environmental tank, oil-collecting unit, vacuum system, and air distributors. The vacuum technique is found very effective under all possible operating conditions. Several operating parameters are investigated such as hole arrangement (vertical and horizontal slots), air distributors location (one-side and two-sides strategies),...
The unpromoted and promoted Fischer-Tropsch synthesis (FTS) catalysts were characterized using techniques such as X-ray diffraction (XRD), temperature programmed reduction (TPR), X-ray absorption spectroscopy (XAS), Brunauer-Emmett-Teller surface area (BET SA), hydrogen chemisorption and catalytic activity using a continuously stirred tank reactor (CSTR). The addition of small amounts of rhenium to...
In crude oil-toluene solutions dynamic viscosity η and spin-spin relaxation time T 2 were measured as functions of asphaltene concentration C in the range of 10-300mg/l. The results were supplemented by studies of optical absorption. Extrema in the measured concentration dependencies are attributed to a transient predominance of specific asphaltene aggregates-from dimers to stacked molecular...
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.