The performance of limestone-derived CaO during many (>1000 in some cases) calcination and carbonation cycles is reported. After 150 cycles, the calcium utilization during carbonation reached a minimum value between 4 and 17%, with the asymptotic level depending strongly on the carbonation time.
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@article{osti_7301513, title = {Influence of limestone calcination on the utilization of the sulfur-sorbent in atmospheric pressure fluid-bed combustors. Final report}, author = {Ulerich, N. H. and O'Neill, E. P. and Keairns, D. L.}, abstractNote = {Fluidized bed combustion for electric power generation is a direct combustion process for coal with the …
Fluidized bed combustion or gasification allows for in-bed sulfur capture with a calcium-based sorbent such as limestone or dolomite. Sorbent particle size, porosity, internal surface, and their variation during conversion have great influence on the conversion of the sorbent. The uptake of SO{sub 2} and H{sub 2}S by five physically …
The capability of limestone as sorbent for sulphur retention and oxygen carrier was evaluated with the number of redox cycles by means of experimental tests performed in a TGA. In addition, both the evolution of the composition of limestone to become an oxygen carrier and the reactivity of sulphated limestone were analysed.
The effects of mineral-acid doping on the long-term reactivity of limestone-based sorbents for CO2 capture was investigated in this work. Havelock (Canada), Longcliffe (U.K.), and …
This article is focused on the sorbent CO 2 uptake performance and attrition/fragmentation tendency when operating conditions simulating those of a DIFB-SEG process are adopted. Experiments were carried out on a commercial Italian limestone in a laboratory-scale DIFB reactor. Carbonation was carried out in a range of test conditions, ...
Limestone furnace injection is a type of furnace sorbent injection, whereby a pulverized calcium-based sorbent, such as hydrated lime or limestone, is injected directly into the combustion zone above the burners. Calcium duct injection introduces the powdered sorbent (lime or limestone) into the flue-gas ductwork, downstream of the boiler, but ...
Experimental measurements of the reaction of sulfur dioxide and oxygen with limestones have demonstrated substantial influence of the geologic origin of the stone, its porosity and particle size, gaseous concentration of sulfur dioxide, and temperature on the course of reaction and the conversion (that is, the degree of utilization of the limestone content of …
The attrition of binary mixtures of iron powder, as a representative oxygen carrier, and limestone, as a CO 2 sorbent, was investigated to examine the interactions of two different solid species ...
In addition, the low price and high availability of sorbent (limestone) and the potential to use the spent sorbent in other applications (e.g. construction materials, cement etc.) are key ...
Moghtaderi et al. studied the reaction kinetics of a limestone sorbent in low CO 2 partial pressure using TGA data [15]. The study testified that the isoconversional method can be convincingly ...
1. General overview. Sorption-Enhanced Gasification (SEG) can rely on the use of inexpensive Ca-based sorbent (like limestone) for CO 2 removal from syngas in …
It has been found that a spent limestone sorbent, coming from a pilot-scale calcium looping fluidized bed (CaL-FB) plant and purged after 60 cycles of calcination and carbonation, can be successfully employed in the Portland cement clinker manufacture in place of natural limestone. Laboratory measurements showed that the burnability index …
The use of inexpensive natural materials such as limestone (∼$10/t) or spent lime-based sorbent provides very low costs for these pellets. The calcium alumina cements are also relatively inexpensive …
The performance of limestone-derived CaO during many (>1000 in some cases) calcination and carbonation cycles is reported. After 150 cycles, the calcium utilization during carbonation reached a minimum value between 4 and 17%, with the asymptotic level depending strongly on the carbonation time. With the aid of mechanistic …
In this process the solid sorbent cycles between two interconnected FBs. The flue gas enters the carbonator where a CaO-based material reacts with the CO 2 present, resulting in formation of CaCO 3 (saturated sorbent). This carbonation reaction occurs at a fairly rapid rate between 580 and 700 °C [25], [26], [27], which is suitable for …
Investigator System CO2 partial pressure (%) Temperature (oC) Order of reaction Activation energy (kJ mol-1) Pre-exponential factor Barker [13] Commercial limestone (99.5 % CaCO3) in a TGA 0 % 866 Nil 147 Nil Guler et al. [14] Natural limestones in a TGA 0 % 650-770 First order 203.8 1.1×108 (s-1) Borgwardt [15] …
Limestone Sorbent in Calcium Looping for Thermochemical Energy Storage Francesca Di Lauro 1,2, Claudio Tregambi 3,4, Fabio Montagnaro 1,*, Laura Molignano 2, Piero Salatino 2 and Roberto Solimene 4 1 Dipartimento di Scienze Chimiche, Complesso Universitario di Monte Sant'Angelo, Università degli Studi di Napoli Federico II, 80126 …
When considering thermodynamics and sorbent costs, CaO obtained from limestone is the best candidate for use as a solid carrier of CO 2 from dilute gases to …
The performance of the natural limestone from Cadomin and the pelletized limestone (90% natural limestone and 10% calcium aluminate cement (CA-14)) was compared as sorbent for direct CO 2 capture from air at ambient conditions in a fixed bed reactor. Results show that pre-hydration of the sorbents leads to a uniformly carbonated …
The sorbent used in the investigation was an Italian limestone ("Massicci," almost pure CaCO 3). Cylinders of CO 2 and N 2, and a steam generation system (Bronkhorst CEM - Controlled Evaporator and Mixer), equipped with a flow meter/controller, were used to produce surrogate flue gases to simulate SEG conditions.
sorbent particles into coarse and fine and the population of sorbent particles (of different age and sulphation degree) into lime and sulphated limestone components has been adopted. In this work a population balance model is presented, which aims at predicting the sorbent inventory and particle size distribution, the partitioning of
It has been found that a spent limestone sorbent, coming from a pilot-scale calcium looping fluidized bed (CaL-FB) plant and purged after 60 cycles of calcination and carbonation, can be successfully employed in the Portland cement clinker manufacture in place of natural limestone. Laboratory measurements showed that the burnability index …
The reactor consisted issue, unless the emission source is located close to a cement plant, which can use the purged material in place of (part of) its main feedstock of limestone.5,11 Approaches to reduce the impact of the loss of sorbent carrying capacity include thermal preactivation,12 water and steam reactivation,13,14 the production of ...
@article{osti_225473, title = {Hydrogen sulfide capture by limestone and dolomite at elevated pressure. 2: Sorbent particle conversion modeling}, author = {Zevenhoven, C A.P. and Yrjas, K P and Hupa, M M}, abstractNote = {The physical structure of a limestone or dolomite to be used in in-bed sulfur capture in fluidized bed …
The CaL experiments were carried out in a 10 kW th dual interconnected FB facility (electrically heated), described in detail elsewhere [19], [20], using as a sorbent for CO 2 capture a commercial limestone, originating from south Germany [5].This sorbent was also employed as a calcareous component of the RM mixture for the synthesis of …
It uses either lime or limestone as sorbent, forming gypsum as a product. The reliability and availability of the sorbent, the formation of a stable sellable product (gypsum) and high SO 2 removal efficiencies have made wet FGD technology a choice for many power utilities. This technology has low operational costs due to the availability of …
Limestone (calcite) with a high content of CaCO3 can be a good sorbent material as it is readily available at low cost. Limestone from a local cement plant was used in this study. The material which had been pre-crushed in a mill at the plant was classified into four different size classes: 120-150 μm, 150-180 μm, 180-300 μm and 300-500 μm.
