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.

scholarly journals KAJIAN KINERJA SIKLON PEMBERSIH DAN PENGARUHNYA TERHADAP KONSENTRASI GAS-GAS HASIL GASIFIKASI TANDAN KOSONG KELAPA SAWIT

2020 ◽  
Vol 21 (3) ◽  
pp. 211-218
Keyword(s):  
Pressure Drop ◽  
Oil Palm ◽  
Collection Efficiency ◽  
Operating Conditions ◽  
Empty Fruit Bunch ◽  
Gas Temperature ◽  
Empty Fruit Bunches ◽  
Purification System ◽  
Standard Pressure

ABSTRAK PPembersihan partikel-partikel pengotor dari gas-gas hasil gasifikasi tandan kosong kelapa sawit merupakan salah satu proses penting yang harus dilakukan untuk mendapatkan gas pembawa energi dengan kemurnian yang lebih baik. Pemisahan partikel-partikel tersebut dari umumnya dilakukan dengan menggunakan siklon. Konstruksi dan kondisi operasi siklon, seperti suhu gas yang masuk, berperan penting dalam menentukan kinerja pemisahan partikel dari gas tersebut. Penelitian ini bertujuan untuk mengkaji pengaruh perubahan suhu gas terhadap kinerja siklon dalam memisahkan partikulat dan tar dari gas-gas hasil gasifikasi tandan kosong kelapa sawit. Hasil kajian menunjukkan bahwa peningkatan suhu gas yang masuk ke siklon mampu memisahkan partikel berukuran 5–6 μm di kisaran suhu 200–300 °C pada efisiensi minimum 50%. Hasil perhitungan efisiensi pengumpulan rata-rata mencapai 98,23%, sedangkan hasil pengukuran adalah 85,56%. Hasil perhitungan dan ekperimen terhadap tekanan jatuh pada siklon, masing-masing, adalah 100,11 dan 87 mmH2 O, berada pada kisaran standar tekanan jatuh yang disarankan. Efisiensi dan tekanan jatuh yang diperoleh menunjukkan bahwa siklon dapat bekerja dengan baik. Hasil kajian menunjukkan bahwa siklon sebaiknya digunakan pada tahap awal dari proses pemisah partikel dari gas hasil gasifikasi, pada saat suhu gas masih tinggi Kata kunci : Efisiensi Pengumpulan; Pengurangan Diameter; Penurunan Tekanan; Suhu Gas; Tar ABSTRACT Gas purification is one of a very crucial process required to be performed in order to obtain a better quality of gasses produced by grasification of oil palm empty fruit bunches. A cyclone is usually used in the purification process to separate particles and tarss from the gas. Particle separating performance of a cyclone is affected by its construction and operating conditions, such as temperature of the entering gas. The objectives of this study is to examine the effect of the entering gas temperature to the cyclone performance in separating particulates and tar from gases produced by gasification of oil palm empty fruit bunch. The results shows that the cyclone was capable in separating particles with size of 5-6 μm at entering gas temperature range of 200- 300 °C, at a minimum efficiency of 50%. The calculated average collection efficiency was 98.23% while the experimental results were 84.56%. Calculation and experimental data on pressure drop within the cylone was 100.11 and 97.0 mmH2 O, respectively, and fall within the required standard pressure drop. The collection efficiency and pressure drop indicated that the cyclone performed well. The study also suggests that cyclone is best to be used at the first row of the purification system for gases produced by gasification of empty fruit bunch since the temperature is still high enough Keywords : Collection Efficiency; Diameter Cut Size; Pressures Drop; Temperature of Gas; Tar

Improvement of separate elements of the techno-logy of cultivation of white cabbage in the conditions of the of the central region of the non-chernozem zone

2020 ◽  
Author(s):  
A.V. Konstantinovich ◽  
◽  
A.S. Kuracheva ◽  
E.D. Binkevich
Keyword(s):  
Seed Treatment ◽  
Unit Area ◽  
Growing Season ◽  
Agricultural Products ◽  
Stress Factors ◽  
High Quality ◽  
Temperature And Precipitation ◽  
White Cabbage ◽  
Sowing Seed

In conditions of climate change, when temperature and precipitation fluctuations occur more and more frequently during the growing season, it is necessary to obtain high quality seedlings with "immunity" to various stress factors, including high weediness, the damage from which is associated with a decrease in yield (by 25 -35%) and with a deterioration in the quality of agricultural products. Due to the imbalance in production technology, seedlings are often weakened, overgrown, with a low yield per unit area and survival rate in the field. One of the solutions to this problem is the use of PP for pre-sowing seed treatment to increase the competitiveness of seedlings in the field.

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.

The Distribution of Rabbit Warrens at Mitchell, Queensland, in relation to Soil and Vegetation Characteristics

1976 ◽  
Vol 3 (2) ◽  
pp. 129 ◽  
Author(s):  
BS Parker ◽  
LS Hall ◽  
K Myers ◽  
PJ Fullagar
Keyword(s):  
Unit Area ◽  
Sandy Soils ◽  
Food Type ◽  
Survey Area ◽  
Late Afternoon ◽  
Transect Counts ◽  
Vegetation Characteristics ◽  
Selection For ◽  
Open Woodland

In a 42,750-ha survey area in subtropical Queensland, rabbit warrens are confined mainly to sandy soils. Within these favoured areas the population is distributed unevenly, and there is further selection for preferred habitats. Detailed studies on a 246-ha area of sandhill showed that the open woodland and grassy open woodland associations contain most warrens per unit area, and also the largest warrens. The quality of habitat for rabbits appears to be determined by availability of food, type of soil, and vegetation cover providing protection from predators. In some vegetation associations, use of burrows varies only slightly, in others there are significant changes. There is a significant correlation between the estimated numbers of rabbits in the population, the total number of rabbits seen on spotlight transect counts in the evening, the numbers of rabbits seen on warrens during late afternoon watches, and the total number of active burrow entrances present in the study area. A list of plant species present and a description of the 23 vegetation associations in the study area is presented.

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.

scholarly journals Performance of ‘Eragil’ peach trees grown on different training systems

2019 ◽  
pp. 16
Author(s):  
Alison Uberti, Clevison Luiz Giacobbo
Keyword(s):  
Unit Area ◽  
Training System ◽  
Productive Efficiency ◽  
Lower Yield ◽  
Training Systems ◽  
Growth Vigor ◽  
Leader Training ◽  
Peach Trees ◽  
Training And Pruning

The aim of this study was to evaluate phenology aspect, vigor, production and quality of ‘Eragil’ peach trees grown under different training and pruning systems. Evaluations were carried out during two seasons, 2015/16 and 2016/17. Fruit tree training and pruning systems ‘Open Center’ (3.5 × 5.0 m), ‘Ipsilon’ (1.5 × 5.0 m) and ‘Central Leader’ (0.8 × 5.0 m) were used. Phenology, vegetative growth (vigor) and yield were evaluated. ‘Central Leader’ plants showed a higher productivity and productive efficiency. ‘Open Center’ plants had a greater vigor and yield per plant, however had a lower yield by unit area. Plants with ‘Y’ shape were intermediates between ‘Open Center’ and ‘Central Leader’ in relation of the evaluated variables. ‘Central Leader’ training system can be used for peach orchards in order to increase yield and productivity indexes.

scholarly journals The influence of thermal fixation of interlining on the quality of woven clothing fabrics evaluated from the aspect of their electrical resistance

2020 ◽  
Vol 68 (4) ◽  
pp. 4-11
Author(s):  
Koviljka Asanović ◽  
Tatjana Mihailović ◽  
Mirjana Kostić ◽  
Iva Gajić ◽  
Aleksandra Ivanovska
Keyword(s):  
Electrical Resistivity ◽  
Ambient Air ◽  
Polyester Fabric ◽  
Woven Fabrics ◽  
Plain Weave ◽  
Weave Fabric ◽  
Polyester Fibers ◽  
Electrical Resistivities ◽  
Twill Weave

In this paper, the influence of thermal fixation of woven interlining on the quality of woven fabrics, evaluated from the aspect of their dc volume electrical resistivity, was investigated. The plain weave fabrics made from cotton, flax, viscose, polyester, and cotton/polyester blends and 3/1S twill weave fabric obtained from cotton and polyester fibers blend were investigated. A cotton fabric with a point-applied thermoplastic binder was used as an interlining. The obtained results showed that the dc volume electrical resistivity of fabrics is influenced by their chemical composition, type of weave, type of yarn, fabric density which is especially pronounced in the interlining, the process of thermal fixation of the interlining, and ambient air humidity. The thermal fixation of the woven interlining greatly reduces the dc volume electrical resistivity of polyester fabric (499 times in the warp direction and 860 times in the weft direction), and increases the resistivity of other fabrics in the range of 1.3 times for viscose fabric and fabric obtained from cotton and polyester fibers blend in plain weave to 3.9 times for twill weave fabric. Based on the conducted investigation, it can be concluded that the quality of the tested fabrics evaluated from the aspect of their electrical resistivities, was significantly improved in the case of polyester fabric i.e worsens in the other investigated fabrics after thermal fixation of the woven interlining.

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