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 three-fluid Eulerian approach, which couples structure-dependent kinetic models of catalysis and carbonation reactions, is used to model sorption-enhanced steam reforming of coke oven gas (SER-COG) in a pilot-scale fluidized bed reactor. Three pellet models (PM-I, PM-II, PM-III) in terms of methodologies coupling hydrodynamics of multiple fluids with multi-scale reactions were comparatively studied...
A novel model is presented that incorporates the Arrhenius integral into one of the generalized extreme value (GEV) distributions to describe the pyrolysis of complex feedstocks. The model differs in structure from distributed activation energy models (DAEM), and its self-variable differs from Weibull mixture models. It is found that all first order reactions, regardless of their activation energies...
CO 2 capture by means of CaO cycling represents a cost effective, immediate solution to rising CO 2 emissions. The mechanism of loss of utilization efficiency and associated change in carbonation kinetics of CaO particles was examined by conducting calcination/carbonation cycling of 150–250μm Strasburg limestone precursor, by swinging the pressure from atmospheric (for calcination)...
Two Greek limestones with different properties were tested to determine their CO 2 and SO 2 capture performance. The reversibility of the sorbents for CO 2 capture was investigated by performing looping cycles in atmospheric and pressurized thermogravimetric reactors, with synthetic gas mixtures containing different partial pressures of CO 2 and SO 2 to simulate...
Steam gasification of biomass integrated with CO 2 capture in a dual fluidized bed with carbon sequestration is among the promising technologies being developed for sustainable production of hydrogen. A simple steady state model which considers two coupled reactors, one calcining limestone particles, while the other steam gasifies biomass and simultaneously carbonates the lime sorbent, is...
It is not well understood how co-feeding of coal and biomass influences the reaction kinetics of gasification and pyrolysis. Co-pyrolysis of biomass and fossil fuels is investigated in this paper. After fuel characterization, the influences of temperature on the physical and chemical properties of char produced from biomass and non-biomass fuels were investigated, and the kinetics of atmospheric-pressure...
Limestone particle attrition was investigated in a small circulating fluidized bed reactor at temperatures from 25 to 850°C, 1atm pressure and superficial gas velocities from 4.8 to 6.2m/s. The effects of operating time, superficial gas velocity and temperature were studied with fresh limestone. No calcination or sulfation occurred at temperatures ⩽580°C, whereas calcination and sulfation affected...
Three limestones and three spent calcium sorbents with differing sulfation patterns were subjected to sulfation and steam hydration at 250 and 450°C in an effort to identify the optimum conditions for increasing their ability to capture sulfur. Visual and chemical investigations of the hydrated and resulfated samples using a scanning electron microscope indicate that the sulfation pattern controls...
Experiments were conducted to understand competing NO x formation and destruction reactions better in circulating fluidized bed combustion. Both longitudinal and lateral gradients were measured for NO x , O 2 , CO and CH 4 during combustion of solid fuels of differing reactivity in a CFBC pilot unit 152 mm square by 7.3 m tall. Fuels tested were anthracitic, bituminous,...
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.