Increasing the Fine Particulate Collection Efficiency of Existing Scrubbers without Increasing Pressure Drop: All it Takes is Water

2016 ◽  
Vol 2016 (3) ◽  
pp. 675-694
Author(s):  
F. Michael Lewis ◽  
Lee A Lundberg ◽  
David A Hoecke
Keyword(s):  
Pressure Drop ◽  
Collection Efficiency ◽  
Fine Particulate

scholarly journals A New Approach of Dedusting for IGCC by a Two-Stage Moving Granular Bed Filter

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2534
Author(s):  
Chiawei Chang ◽  
Yishun Chen ◽  
Litsung Sheng ◽  
Shusan Hsiau
Keyword(s):  
Pressure Drop ◽  
Mass Flow ◽  
Power Plants ◽  
Collection Efficiency ◽  
Size Distributions ◽  
Granular Bed ◽  
Two Stage ◽  
Mass Consumption ◽  
Particulate Size ◽  
Dust Particulate

We propose a dust removal technology in which a two-stage moving granular bed filter was employed using coarse and fine filtering granules. The pressure drop, collection efficiency, and dust particulate size distributions were investigated using various mass flow rates for coarse and fine granules at room temperature. In addition, the ratio of mass consumption was used to reveal the actual mass flow. The ratio of mass consumption influenced the pressure drop, collection efficiency, and dust particulate size distributions. Particulates larger than 1.775 μm were removed by the filter. Our results showed that a mass flow of 330 g/min for coarse granules and a mass flow of 1100 g/min for fine granules provided optimal collection efficiency and particulate size distribution. The proposed design can aid the development of high-temperature systems in power plants.

scholarly journals Grid convergence study of a cyclone separator using different mesh structures

2017 ◽  
Vol 23 (3) ◽  
pp. 311-320 ◽  
Author(s):  
R.A.F. Oliveira ◽  
G.H. Justi ◽  
G.C. Lopes
Keyword(s):  
Pressure Drop ◽  
Collection Efficiency ◽  
Fluid Dynamic ◽  
Two Phase ◽  
Mesh Structure ◽  
Pressure Drops ◽  
Regular Elements ◽  
Grid Convergence ◽  
Grid Convergence Index ◽  
Mesh Structures

In a cyclone design, pressure drop and collection efficiency are two important performance parameters to estimate its implementation viability. The optimum design provides higher efficiencies and lower pressure drops. In this paper, a grid independence study was performed to determine the most appropriate mesh to simulate the two-phase flow in a Stairmand cyclone. Computational fluid dynamic (CFD) tools were used to simulate the flow in an Eulerian-Lagrangian approach. Two different mesh structure, one with wall-refinement and the other with regular elements, and several mesh sizes were tested. The grid convergence index (GCI) method was applied to evaluate the result independence. The CFD model results were compared with empirical correlations from bibliography, showing good agreement. The wall-refined mesh with 287 thousand elements obtained errors of 9.8% for collection efficiency and 14.2% for pressure drop, while the same mesh, with regular elements, obtained errors of 8.7% for collection efficiency and 0.01% for pressure drop.

Collection Efficiency and Pressure Drop of Needle Punched Filters

1976 ◽  
Vol 98 (2) ◽  
pp. 675-680 ◽  
Author(s):  
E. M. Afify ◽  
M. H. Mohamed
Keyword(s):  
Pressure Drop ◽  
Unit Area ◽  
Collection Efficiency ◽  
Pressure Rise ◽  
Woven Fabrics ◽  
Dimensionless Form ◽  
Time Duration ◽  
Time Rate ◽  
Concentration Time

Although needle punched fabrics have been used in filtration with increasing success, only meager information is available on their performance characteristics in relation to their unique structure. In this paper an experimental investigation on the performance of needle punched filters is presented. A testing apparatus designed and constructed for this study is described. The pressure drop characteristics of needle punched filters were investigated. The effects of flow rate, packing density, and needling intensity were studied. Experiments were also performed to determine the collection efficiency of needle punched filters using flyash. The effect of flyash concentration, time duration of test, and needling intensity were considered. The role played by the structure in utilizing the mechanisms of collection and reducing the time rate of pressure rise during filtration is discussed. A new scale for measuring the quality of performance of filters using dust and relating, in a dimensionless form, the dust penetration, the pressure drop, and the filter weight per unit area was also developed. Comparison between the performance of commercial woven and needle punched filters demonstrated the superiority of needle punched fabrics over woven fabrics in filtration.

A new cyclone separator-based pre-filter design for internal combustion engine applications. Part 2: Parametric study and optimization

2006 ◽  
Vol 220 (12) ◽  
pp. 1755-1764 ◽  
Author(s):  
K Madhusudhan ◽  
M V Narasimhan ◽  
R V Ravikrishna
Keyword(s):  
Pressure Drop ◽  
Parametric Study ◽  
Filter Design ◽  
Combustion Engine ◽  
Collection Efficiency ◽  
Geometrical Parameters ◽  
Cyclone Separator ◽  
Air Filtration ◽  
Dust Collection ◽  
Filter Configuration

In a previous paper a new design was presented of a cyclone separator based pre-filter along with validation of a numerical model with experimental data. The validated model is used to evaluate certain designs with varying inlet air entry configurations. Furthermore, several cases as part of a detailed parametric study on the new pre-filter design are simulated in terms of geometrical parameters to optimize the performance with respect to overall pressure drop and dust collection efficiency. The results of the parametric study are used to derive a final optimized pre-filter configuration. In addition, based on the results of some of the simulations, a new concept of air filtration which could potentially replace the conventional air filter plus pre-filter configuration is introduced and assessed numerically. This design utilizes the high swirl velocities of air to separate particles as small as 4-5 μm with almost 100 per cent efficiency. More importantly, it offers much lower pressure drop than the total pre-filter plus main filter configuration.

scholarly journals Performance of a cyclone scrubber on removal of fine particulate matter

2020 ◽  
Vol 26 (1) ◽  
pp. 31-40
Author(s):  
Ana Achiles ◽  
Vádila Guerra
Keyword(s):  
Pressure Drop ◽  
Sugar Cane ◽  
Gas Flow ◽  
High Efficiency ◽  
Fine Particles ◽  
Collection Efficiency ◽  
Sugar Cane Bagasse ◽  
Flow Ratio ◽  
Liquid Injection ◽  
Gas Flow Ratio

Cyclones are not classified as effective devices for removing fine particles, while high efficiency wet scrubbers usually have high operational costs. In order to achieve better performance, the aim of this study is to evaluate, for the first time, a cyclone scrubber design based on the dimensions of a Stairmand cyclone separator with the inclusion of liquid injection nozzles located in different positions to improve the separation of fine particles. Given the lack of studies considering the effect of liquid injection and other operational conditions in the removal performance of a cyclone scrubber with Stairmand dimensions, the present paper provides a complete evaluation of these effects for the separation of sugar cane bagasse ash from air. The parameters investigated were inlet gas velocity, liquid injection position, liquid-to-gas flow ratio and droplet size distribution. The cyclone scrubber performance was evaluated considering collection efficiency and pressure drop. Overall efficiency of almost 99% and low-pressure drop was achieved by employing a liquid-to-gas flow ratio of 0.43 L/m? for the collection of ash from the combustion of sugar cane bagasse. Grade efficiencies revealed that injecting droplets into cyclones significantly improved the removal of fine particles with an aerodynamic diameter less than 2.5 ?m.

scholarly journals Optimization of Air Distribution in a Baghouse Filter Using Computational Fluid Dynamics

2019 ◽  
Vol 9 (4) ◽  
pp. 4452-4456
Author(s):  
W. F. Lima ◽  
R. Huebner
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pressure Drop ◽  
Collection Efficiency ◽  
Flow Distribution ◽  
Bag Filter ◽  
Cleaning Efficiency ◽  
Dimensional Changes ◽  
Computational Fluid Dynamics Analysis ◽  
Traditional Approaches

Baghouse filters are used to reduce the emission of pollutants in the atmosphere. With the stricter environmental regulations and the need to avoid the emission of pollutants into the atmosphere, the demand for better results in terms of collection efficiency and filtration rises. A good performance of a baghouse filter is closely linked to the correct flow distribution inside it, whether in the hopper or in the bags. Other important variables for good performance are internal speed, filtration rate (RAP), pressure drop, cleaning efficiency, etc. The upgrading of existing bag filters to current standards is a major challenge for the industry, generally due to, among other factors, emission regulations and common physical and dimensional constraints of the existing equipment. Computational Fluid Dynamics analysis (CFD) can help deal with this problem because it makes possible to perform several analyzes at a lower cost and with great result accuracy when compared with the traditional approaches. In this work, the analysis of an existing bag filter, which presents serious problems of premature discharging of components due to nonuniformity in the internal distribution of the flow, is performed. This analysis has several steps, among them, documentation survey, field survey, flow and pressure drop measurements (pressure differential between the clean side and the dirty side of the filter) with the aid of CFD, with the objective to raise pressure and velocity and to identify possible dimensional changes to improve flow uniformity.

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