Dust Collection Performance of Bag Filters in Rice Processing Facilities
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Highlights The rice dust collection performance of bag filters was investigated. The pressure drop and rice dust collection efficiency were measured with various parameters. Correlation equations are suggested for the pressure drop across a clean filter medium and across the dust cake. Abstract. Because rice dust constitutes a form of air pollution, bag filters are widely used in rice processing facilities. Rice dust has various particle sizes, and the dust concentration in air is low with rice dust. Research on the rice dust collection performance of bag filters is necessary for effective dust collection in rice processing facilities. The objective of this study was to investigate the rice dust collection performance of bag filters. The pressure drop and rice dust collection efficiency were measured with various face velocities, dust concentrations, and fabric filter media. The dust collection efficiency decreased slightly with increases in the face velocity and in the maximum pressure drop in normal conditions. In addition, correlation equations of the pressure drop across a clean filter medium and across the dust cake are suggested to predict the pressure drop in overloaded conditions in rice processing facilities. The average error was 20.2%, and it decreased with increasing pressure drop. Using the correlation equations, bag filters can be managed to remove the deposited dust before the pressure drop significantly increases or reaches its maximum value. Keywords: Bag filter, Dust collection efficiency, Pressure drop, Rice dust.Keywords:
Dust collector
An existing analytical pore-scale model is adapted in order to predict the pressure drop over a biofilter.The difference compared to a conventional packed bed is the effect of biofilm growth that has to be incorporated.Being able to predict the pressure drop and also the specific surface area of the packing material over several days of biofilter operation, aids in the optimization of the biofiltration process.The proposed model is validated against available experimental data of a biofilter with schist as packing material.The data includes measured pressure drop values, flow rates and porosity for 7 different days over a 106 day period.Two methods are proposed to predict the biofilm affected specific surface area.The first method is based on a relationship available in the literature in which the biofilm thickness and biofilm affected porosity are incorporated into the biofilm affected specific surface area.A second method is proposed in which the specific surface area can be determined if measured pressure drop and superficial velocity values are provided.The analytical pressure drop prediction is compared to an empirically adapted model proposed in the literature, with satisfactory results.The advantage of the analytical model is that it can provide physical meaning to the adaptations made.
Biofilter
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The air flowrate through a flexible HEPA grade filter (Part LANCS-BOP 6CPVC-1.5-2SPVC www.lancsindustries.com) was measured at 48 ALPM for a differential pressure drop of 1.0 psig (28 inWC, 7.0 kPa). These filters are rated by the manufacturer to have a flowrate of 3 ALPM at a differential pressure drop of 1 inWC (0.25 kPa). The Los Alamos National Laboratory Aerosol Engineering Facility used one of their test rigs (originally developed to measure the pressure drop in capsule HEPA filters) to measure the airflow through the LANCS bag filter.
Differential pressure
HEPA
Air filter
Cartridge
Dust collector
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The feasibility of cartridge dust collector used in the narrow space of mine working face to solve the harmful dust problem is discussed.Through the analysis of the mine dust removal technology and the mine working face environment,a small cartridge dust collector is designed. And the simulated experiment to collect coal dust in laboratory is done.The results show that the collection efficientT of the application of the cartridge dust collector can reach above 99%,and the lowest resistance is below 500Pa.So the cartridge dust collector used in mine has good develop- ment prospect.
Cartridge
Dust collector
Coal dust
Dust control
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With the research system of nitrogen and deionized water, this paper researches the pressure drop of gas-liquid two-phase flow in the circular microchannel with an inner diameter which is respectively 0.9mm and 0.5mm, analyzes the effect of microchannel diameter on gas-liquid two-phase frictional pressure drop in the microchannel reactor, and compares with the result of frictional pressure drop and the predicting result of divided-phase flow pattern. The result shows that, the gas-liquid two-phase frictional pressure drop in the microchannel significantly increases with the decreasing microchannel diameter; Lockhart-Martinelli relationship in divided-phase flow pattern can preferably predict the gas-liquid two-phase frictional pressure drop in the microchannel, but the Tabular constant needs to be corrected.
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Dust collector is one of the most widely used equipment among the method of separating particles, it filters exhaust gas having various kinds of dusts through several filters installed on parallel. This research investigated the moving characteristic of Honeycomb-type carbon filter in pressure drop of smoking collector's ventilation system. It also compared pressure transmission coefficient through pressure drop according to flow velocity change.
Honeycomb
Dust collector
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Filtration (mathematics)
Low-flow irrigation systems
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Packed reactors are broadly used in the chemical industries and are considered as a multiphase reactors. The optimization of these reactors is influenced by many parameters which the most important is the pressure drop. Thus, the aim of this paper is to study the effect of pressure drop along the one single phase (gas) and two phases (gas-liquid), as well as, in one stage and stages of packed beds "Pb". For this purpose, a 3-D CFD model presenting a vertical packed column of one single stage and two stages of packed beds is established using Ansys-Fluent. The CFD simulations are compared with the available experimental data and empirical models. The results are made to determine the pressure drop of an air flow in one single stage of packed bed in order to check that Ergun equation is correctly verified. Then, an air-water flow in two stages of packed bed is carried out. Moreover, the effect of porosity, packing size and mixture velocity on pressure drop of gas-liquid flow are investigated numerically. As results, pressure drop was found to be less than 40% lower in two stage packed column than in one stage. This study provides the understanding of the pressure drop in order to extract informations for the reactors and to ensure that CFD can be used as a useful tool for modelling.
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Abstract The present article outlines the development of a semi‐analytical model devoted to predict the pressure drop induced by clean pleated high‐efficiency particulate air (HEPA) filters. Both experimental measurements and numerical simulations are used to characterize the velocity field in the pleat channel. On this basis, a semi‐analytical model is derived to determine the gas flow within the pleat channel. This analytical formulation is used to predict the air pressure evolution according to filtration velocity in the pleat. This model is then validated on the basis of comparisons with measurements found in the scientific literature for different kinds of HEPA filters with different pleat geometries. This model is easy to use, fast to run compared to standard computational fluid dynamics (CFD) approaches, and is in good agreement with the experimental results.
HEPA
Air velocity
Air filter
Filtration (mathematics)
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The pressure drop mechanism of the recently designed modular catalytic structured packing(MCSP) Win-pak-C was analyzed.As the Winpak-C was based on Winpak,its pressure drop was derived from Winpak accordingly.Pressure drop principles were deduced from the Fluent simulated results:head loss at the layer entrance,head loss of gas flow confluence and diffluence through windows,head loss due to gas flowing out of the junction,head loss due to gas flowing into the junction,head loss of wall effects,and head loss at the layer exit.The major causes of pressure drop were discussed,optimized and compared. Furthermore,relationships among total loss coefficient,Reynolds number and catalyst loading reduction were also investigated.The results indicate that the proposed method can reduce the pressure drop of Winpak-C and the capacity of the catalytic distillation column can be increased.
Pressure head
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