New granular material for hot gas filtration: Use of the “Lapilli”

Macías-Machín, A.; Socorro, María del; Verona, José Miguel Monzón; Macı́as, M.

doi:10.1016/j.cep.2006.02.009

Cited by 17 publications

(8 citation statements)

References 18 publications

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“…Besides electrostatic precipitators and fabric filters, granular bed filters represent the third important type of dust collector used in cement industries. The granular bed filter is one of the most promising approaches to remove fine particles from high temperature gas streams (Macias-Machin et al, 2006;Zhao et al, 2008). Granular bed filters are attractive for hot gas filtration because they employ low cost refractory granules as media.…”

Section: Introductionmentioning

confidence: 99%

“…The development of continuously operating filtration systems such as the panel bed filter, the fluidized and the moving bed filter made granular bed filtration attractive for industrial applications (El-Hedok et al, 2011;Smid et al, 2006). Macias-Machin et al (2006), study the use of new granular volcanic rocks (Lapilli) in the fixed bed filter and in fixed bed heat exchanger for removing fine dust particles from gases. The global efficiency improved when they use a high bed depth.…”

Section: Introductionmentioning

confidence: 99%

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Aerosol Filtration Using Quartz Sand Filter

Cristiana¹

2012

American Journal of Environmental Sciences

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The cement industry is the major source of cement dust which contains heavy metals like nickel, cobalt, lead, chromium, arsenic and hazardous substances like dioxins and furans. Exposure to these substances can cause health problems to human, animals and vegetation. A continuous pilot scale quartz sand filter was constructed and uses to study the effect of important design parameters (temperature, pre-loaded dust on the collector, diameter of the filter, bed depth, collector size and superficial velocity) on its performance for cleaning of cement dust from air. Initial penetration and initial pressure drop (after 180s) were measured and compared for different variables used in this study. The dirty bed was cleaned by means of reverse air flow when the pressure drop across the filter rises to 20 cmH₂O. A macroscopic model describes the filter clogging was used to predict the effluent histories based on initial collection efficiency (Î·₀)_exp which was determined from experimental data. A removal efficiency of more than 99% was obtained. The results show that 0.4% of cement dust still adheres on the quartz sand bed after 5 min of cleaning cycle. The presence of 0.4% of pre-load dust on the quartz sand filter enhanced the efficiency and low initial penetration, moderate initial pressure drop was obtained. At given Empty Bed Contact Time (EBCT), with different filter diameters 30 and 15 cm, a sharp decrease in initial penetration from 0.41-0.03 was obtained respectively. A nonlinear relationship between penetration and temperature was found. The initial penetration can be reduced by using smaller filter diameter, small collector size and collector with pre-load dust with 0.4%. The experiment that operates at a filter diameter of 15 cm and temperature of 25Â°C represent the minimum penetration among all the experiments

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerosol Filtration Using Quartz Sand Filter

Cristiana¹

2012

American Journal of Environmental Sciences

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“…(16) and (17), while the power required to raise the particles per unit of solid mass flow is expressed according Eq. (18).…”

Section: Heat Transfer and Power Requirementsmentioning

confidence: 99%

“…Spheres of steel are also widely used [6,9]. Recently, Macias Machin et al [18] presented "lapilly", a new material for gas filtration applications. In applications different to heat recovery and gas filtration specific materials can be used.…”

Section: Introductionmentioning

confidence: 99%

Solid conduction effects and design criteria in moving bed heat exchangers

Almendros-Ibáñez¹,

Soria-Verdugo²,

Ruiz-Rivas³

et al. 2011

Applied Thermal Engineering

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a b s t r a c tThis work presents a theoretical study of the energetic performance of a moving bed heat exchanger (MBHE), which consists of a flow of solid particles moving down that recovers heat from a gas flow percolating the solids in cross flow. In order to define the solid conduction effects, two solutions for the MBHE energy equations have been studied: an analytical solution considering only convection heat transfer (and neglecting solid conduction) and a numerical solution with the solid conductivity retained in the equations. In a second part, the power requirements of a MBHE (to pump the gas and to raise the down flowing particles) are confronted with the heat transferred considering the variation of design parameters, such as gas and solids' velocities, solids particle diameter or MBHE dimensions.The numerical results show that solid conductivity reduces the global efficiency of the heat exchanger. Therefore, a selection criterion for the solids can be established, in which their thermal conductivity should be minimized to avoid conduction through the solid phase, but to a limit in order to ensure that temperature differences inside an individual solid particle remain small. Regarding the other energy interactions involved in the system, these are at least one order of magnitude lower than the heat exchanged. Nevertheless, for a proper analysis of the system the efficiency of the devices used to pump the gas and to raise the particles and the relative costs of the different energy forms present in the system should be taken into account.

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“…Materials can be as unusual as low-silica lapilli (volcanic rock) or as common as limestone or sand. A spherical form of sintered bauxite (alumina-oxide) with particle diameters typically on the order of several hundred micrometers is a common example [94,106,107]. During fixed-bed operation, pores in the granular material become filled when particulate matter contacts and adheres to the surfaces.…”

Section: Particulate Mattermentioning

confidence: 99%

Development and application of a rapid sampling technique for identification and quantification of compounds in high temperature process gas streams produced from biomass gasification and pyrolysis

Woolcock

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New granular material for hot gas filtration: Use of the “Lapilli”

Cited by 17 publications

References 18 publications

Aerosol Filtration Using Quartz Sand Filter

Aerosol Filtration Using Quartz Sand Filter

Solid conduction effects and design criteria in moving bed heat exchangers

Development and application of a rapid sampling technique for identification and quantification of compounds in high temperature process gas streams produced from biomass gasification and pyrolysis

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