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.
Numerical investigations of the combustion process and NO x emission were conducted for two swirl burners (a prototype swirl burner and an optimised swirl burner) and a 600MWe wall-fired boiler. The predicted results and the measured information from the full-scale boiler were found to be in good agreement. The flow field, particle distribution, temperature pattern, and species concentration...
Thermal diffusivity measurements of different oils and their respective biodiesels are investigated by means of thermal lens spectroscopy. The viscosities of biodiesel decrease by approximately one order of magnitude, while thermal diffusivity showed an inversely proportional dependence with respect to the produced biodiesels from several oils sources. This correlates to unsaturation levels present...
Steam-separator temperature is an important parameter of ultra-supercritical boilers, where temperature deviations result in an increase in feed-water and a fast decline in steam temperature. Optimizing temperature deviations through manual operating-variables adjustments is difficult because of the complex relationships among influencing factors, as well as unacceptable increases in combustion air...
Coal seam degasification through underground drilling and its efficiency are directly related to the safety of underground coal mining. The major problem of underground coal seam gas drainage is the rapid decay of gas concentration, which may lead to a low utilization ratio and many hazards, such as environmental pollution, spontaneous combustion of coal, gas combustion and gas explosion. Although...
The purpose of this study is to investigate the common-rail diesel engine and aftertreatment system behaviors during active diesel particulate filter (DPF) regenerations with pure biodiesel and conventional diesel fuels. The experiments were conducted on a medium-duty diesel engine equipped with a high pressure common-rail fuel injection system. The comparative effects of post start of injection (SOI)...
It has been shown that AgX zeolite has a distinctly higher adsorption capacity compared to NaX, NiX and NiAgX zeolites for ethyl mercaptan. Chosen as the best adsorbent, the adsorption isotherms of ethyl, iso-propyl, n-butyl and iso butyl mercaptans on AgX zeolite at three different temperatures of 26, 40 and 60°C had been studied. The AgX zeolite showed the highest adsorption capacity for the ethyl...
The effect of the catalyst load in slurry hydrocracking of heavy Maya crude oil was investigated at mild conditions (390°C and 1400 H 2 psi). The catalyst load and operating time were varied in the intervals 0–1000ppm Mo and 0–11h respectively. The results allowed to establish the transformation routes of the different fractions under thermal or catalytic conditions. Under thermal conditions,...
Electrochemical pretreatment (EP) with a pair of Ti/RuO 2 mesh plate electrodes was applied to solubilize waste activated sludge (WAS) with the aid of hypochlorite, and the conventional pretreatment methods of thermal pretreatment (THP), thermal-alkaline pretreatment (TAP) and alkaline pretreatment (AP) were also introduced as the comparative cases. In this study, Growth Rate of Solubilization...
Experimental investigations were carried out in a single cylinder, four stroke, air cooled direct injection (DI) diesel engine, fueled with bioethanol, adopting the fumigation technique. Bioethanol produced by the fermentation of Madhuca indica flower was used as an alternative fuel in this investigation. Bioethanol was fumigated at four different flow rates, viz., 0.24, 0.48, 0.96 and 1.22kg/h in...
Acid infusion of lignocellulosic biomass as a pretreatment prior to fast pyrolysis has been shown to significantly increase the yield of sugar in the products. However, under these conditions char formation increases forming large agglomerates that clog the reactor and eventually interrupt operation of the system. In the present study, partial oxidative pyrolysis of acid infused red oak was performed...
For large-scale implementation of biodiesel in transportation engines, its effect on lubricating oil degradation needs to be experimentally investigated. Due to differences in chemical composition of biodiesel and mineral diesel, the comparative effects on lubricating oil degradation and residual useful life for long-term application will be different. In this study, effect of 20% Karanja biodiesel...
Direct injection (DI) natural gas engines are modern engine concepts providing clean combustion and high fuel efficiency. Even at high injection pressures, such engines operate at heterogeneous/stratified fuel/air mixture conditions due to the relatively short mixing time of the fuel jet. The sub-optimal fuel–air mixture results in emissions of unburnt hydrocarbon (UHC). In particular, one of the...
The combustion and particle number (PN) emissions of a direct injection spark ignition engine (DISI) operating on ethanol/gasoline and n-butanol/gasoline blends with exhaust gas recirculation (EGR) were studied in this paper. Firstly, the effect of EGR and fuel evaporation on charge cooling was investigated. The results indicate that both the addition of EGR and alcohol show evident charge cooling...
The hydrothermal carbonization was investigated to convert anaerobically digested sludge to clean solid fuels. The effects of hydrothermal carbonization were evaluated by varying the reaction temperatures in the range of 180–250°C. Hydrothermal carbonization increased the heating value though the reduction of the hydrogen and oxygen content of solid fuel in addition to investigating drying performance,...
Observations based on short-duration experiments under microgravity of the characteristics of laminar jet diffusion flames burning in coflowing air conditions are described. Experimental conditions were such to establish a flow with Reynolds number of 140 and low air flow velocities of 0–0.5m/s to produce steady laminar flames. Previous studies ignored effects of air flow velocity with small air stream...
The effect of injection pressure on the structural transformation of flash-boiling sprays of gasoline and ethanol is investigated using a multi-hole injector in an optically accessible, single-cylinder spark-ignition direct-injection (SIDI) engine. The engine was run at 1200 revolutions per minute at wide-open-throttle conditions with no intake air boosting. In fully warmed-up engine environments,...
Combustion-generated carbonaceous aerosols are generally in the form of fractal aggregates (FA’s) with shapes that vary from long chain-like structures to much more compact, almost spherical structures, depending upon the mode or stoichiometry of the combustion process. Typically, as combustion moves from fuel-lean to fuel-rich, aggregate morphologies change from the former to the latter. Accompanying...
The objectives of this work were to determine the reactivity of the chars of different cellulosic-based wastes. In energy recovery from waste, the burnout of chars is a part of the overall complex combustion process. Being able to establish simple models for the char burnout process is therefore important. In this study, chars made from wood chips, newspaper and glossy paper were chosen as being representative...
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.