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.
This work evaluates both the removal efficiencies of HCl and SO 2 at different points in a spray dryer using Ca(OH) 2 as the absorbent. The operating conditions were specified in terms of the temperature of the flue gas (200–300°C), the HCl concentration (120–1000ppm), the SO 2 concentration (150–500ppm) and the amount of CaCl 2 added (10–30wt.%).The experimental results...
The influence of different sulfur compounds on corrosion due to naphthenic acid was studied by means of the new method FeNCOR™. It was found that such influence occurs after the reduction of the given sulfur compound by the cathodic reaction of the overall process of naphthenic acid corrosion. When the reduction product is H 2 S the formation of a potentially protective layer of FeS occurs,...
A previously developed 1D model of lignite drying for pulverised lignite feeding into a conventional pulverised fuel boiler during the coal milling process is applied to lignite in an entrained flow configuration at elevated pressure. A combustor fired with diesel and air was used to produce a flue gas at 800°C and 10 atm to flash dry Yallourn lignite at a nominal feed rate of 725kg/h along a 50m...
Asphaltene-based correlations of crude oil properties were analysed for more than 390 recovered (dead) crudes from a new database of the oils of the former USSR, as well as from databases by other authors. For densities, viscosities and pour points the analysis revealed a definite absence of frequently quoted strong linear correlations with asphaltene content and a persistent occurrence of non-linear...
The effect of porous structure and surface functionality on the mercury capacity of a fly ash carbon and its activated sample has been investigated. The samples were tested for mercury adsorption using a fixed‐bed with a simulated flue gas. The activated fly ash carbon sample has lower mercury capacity than its precursor fly ash carbon (0.23 vs. 1.85mg/g), although its surface area is around 15 times...
Pre-combustion microbial desulphurization of coal containing total sulphur (3.90%) and pyritic sulphur (2.80%) has been evaluated in a coal slurry reactor. The coal slurry reactor operated at hydraulic retention time (HRT) of 96h with a coal pulp density of 15 percent and remove 79 percent of pyritic sulphur and 76 percent of ash with an increase in the calorific value of coal from 4400 to 6800kcalkg...
Five Australian black coals were studied in a bench scale pressurised fluidised bed combustor (PFBC) to investigate the agglomeration propensity. It was found that coals with higher proportions of calcium aluminosilicate showed higher propensity for agglomeration and defluidisation. The pressure-drop sintering technique can predict the agglomeration propensity for coals. Samples with a sintering temperature...
Coal-burning power plants that consume pulverized solid fuels produce large amounts of fly ash as a residue. Fly ashes have been used in construction, agriculture, metal recovery and water pollution control. This paper considers the variation in properties of fly ashes to be used in the field of construction.The fly ashes produced in two coal-burning power plants in Asturias (Spain) were physically...
Rapid pyrolysis was conducted in a drop tube reactor using seven coals under various operating conditions. In addition to dense char, porous chars (network char and cenospheric char) were formed by the rapid pyrolysis under certain conditions. Porous char was mainly composed of film-like carbon and skeleton carbon. The pyrolyzed coal char particles were characterized in detail. Morphology and bulk...
The reduction of nitroaromatics to anilines by hydrazine in refluxing isopropanol is catalyzed by: three anthracites, anthracite culm, Beulah Zap lignite, and Illinois No. 6 coal. The anthracites and the culm are very effective catalysts while the coals are less effective. The decomposition of hydrazine is also catalyzed by the anthracites and anthracite culm.
A thermogravimetric system, previously developed for solid fuel degradation, has been modified to examine liquids obtained from conventional pyrolysis and updraft gasification of beech wood. Thermogravimetric curves in air show two main reaction stages. The first (temperatures ≤600K) concerns evaporation, formation and release of gases and formation of secondary char (coke). Then, at higher temperatures,...
The fast depletion of fuel oil and the continuous increase in the demand for power is a global issue. In the Philippines, the demand for diesel oil is expected to increase significantly in a 20-year period as projected by the Department of Energy. In line with the Philippine Government's thrust to lessen the dependence on imported energy, the agenda for the search for alternative fuel is highly prioritized...
A monitoring program was performed to investigate heavy metal content alteration due to exploratory drilling for oil using non-aqueous fluids (NAFs) in Brazilian offshore, 900m deep. Fourteen elements were monitored in 54 sites and it was verified that after drilling activities the average Ba concentration was remarkably increased with respect to background level, even 1 year after the activity. A...
The atmospheric pressure temperature programmed reduction (AP-TPR) technique, an approach for organic sulphur speciation, was extended by mass spectral detection. The coupling gave ground for precise assignment of sulphur compounds in flue gases of lignite lithotypes pyrolyzed in H 2 atmosphere. A broad range of sulphur compounds was determined, i.e. thiols, dimethylsulphide, dimethyldisulphide,...
The aim of this study is to predict efficiency deviations in the combustion of coal blends in power plants. Combustion of blends, as compared to its single coals, shows that for some blends the behavior is non-additive in nature. Samples of coal feed and fly ashes from combustion of blends at two power plants, plus chars of the parent coals generated in a drop-tube furnace (DTF) at temperatures and...
The average structure of organic substances contained in Barzas coal has been constructed by means of a commercial molecular modelling package on the basis of kinetic investigations and structural group analysis of high-molecular products obtained by the process of coal non-isothermal liquefaction in a proton–donor solvent. This model structure has been optimized geometrically by minimization of its...
Three coal macerals with high purities were separated from Pingshuo gas coal. The formation rules of HCN and NH 3 during macerals pyrolysis and gasification were investigated. Experiments were carried out in a tubular quartz reactor at atmospheric pressure. The reactor allowed coal particles to be heated up rapidly and held for a prespecified period of time at a peak temperature. The amount...
Utilization of low rank coal is indispensable to qualify the future demand of energy. Low rank coal, however, has several disadvantages such as small calorific value, so we should develop a new technology of using effectively it. On the other hand, as for the steel manufacturing process, we must think about an effective utilization of iron sludge and scrap from the standpoint of recycle. In this paper,...
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.