scholarly journals Effect of Venturi Structures on the Cleaning Performance of a Pulse Jet Baghouse

2019 ◽  
Vol 9 (18) ◽  
pp. 3687
Author(s):  
Xingcheng Liu ◽  
Henggen Shen
Keyword(s):  
Arrival Time ◽  
Test Bench ◽  
Peak Pressure ◽  
Dust Emission ◽  
Cleaning Efficiency ◽  
Cleaning Performance ◽  
Design Changes ◽  
Throat Diameter ◽  
Cleaning Cycle ◽  
Pulse Jet

In order to study the effect of venturi structures on the cleaning performance of a pulse jet baghouse, several cleaning tests are carried out applying the pulse jet test bench. Experiments are performed using different filter bags with venturi tubes of varying throat diameters and lengths. Peak pressure and peak pressure arrival time are selected to evaluate the cleaning efficiency under different conditions. On this basis, a series of comparative experiments are conducted between a typical venturi-type and a new venturi tube design on a semi-industrial pulse jet baghouse. The effects of the new venturi-type on baghouse cleaning performance and dust emission are studied. The results show that pulsing air pressure has a significant effect on bag-cleaning performance; the larger the throat diameter and the shorter the venturi length, the higher the peak pressure and the shorter the peak pressure arrival time. This improves the cleaning efficiency of the filter bags. The new venturi design changes the distribution of the cleaning pressure in the vicinity of the bag mouth, effectively extending the cleaning cycle and reducing the energy consumption as well as reducing the dust emission concentration of the baghouse.

Investigation of the different particle size dust releases from rigid filter candles during pulse-jet cleaning

2021 ◽  
pp. 095440622110179
Author(s):  
Xin Luan ◽  
Zhongli Ji ◽  
Longfei Liu ◽  
Ruifeng Wang
Keyword(s):  
Particle Size ◽  
Critical Role ◽  
Operating Conditions ◽  
Solid Particles ◽  
Dust Particles ◽  
Cleaning Efficiency ◽  
Term Operation ◽  
Cleaning Performance ◽  
Experimental Apparatus ◽  
Pulse Jet

Rigid filters made of ceramic or metal are widely used to remove solid particles from hot gases at temperature above 260 °C in the petrochemical and coal industries. Pulse-jet cleaning of fine dust from rigid filter candles plays a critical role in the long-term operation of these filters. In this study, an experimental apparatus was fabricated to investigate the behavior of a 2050 mm filter candle, which included monitoring the variation of pressure dynamic characteristics over time and observing the release of dust layers that allowed an analysis of the cleaning performance of ISO 12103-1 test dusts with different particle size distributions. These results showed the release behavior of these dusts could be divided into five stages: radial expansion, axial crack, flaky release, irregular disruption and secondary deposition. The cleaning performance of smaller sized dust particles was less efficient as compared with larger sized dust particles under the same operating conditions primarily because large, flaky-shaped dust aggregates formed during the first three stages were easily broken into smaller, dispersed fragments during irregular disruption that forced more particles back to the filter surface during secondary deposition. Also, a “low-pressure and long-pulse width” cleaning method improved the cleaning efficiency of the A1 ultrafine test dust from 81.4% to 95.9%.

scholarly journals Odour, dust and non-methane volatile organic-compound emissions from tunnel-ventilated layer-chicken sheds: a case study of two farms

2013 ◽  
Vol 53 (12) ◽  
pp. 1309 ◽  
Author(s):  
Mark Dunlop ◽  
Zoran D. Ristovski ◽  
Erin Gallagher ◽  
Gavin Parcsi ◽  
Robin L. Modini ◽  
...  
Keyword(s):  
Dust Emission ◽  
Ventilation Rate ◽  
Gas Chromatography Mass Spectrometry ◽  
Emission Rates ◽  
Layer Chicken ◽  
Volatile Organic ◽  
Different Seasons ◽  
Odour Emissions ◽  
Cleaning Cycle ◽  
Study Sites

An observational study was undertaken to measure odour and dust (PM10 and PM2.5) emission rates and identify non-methane volatile organic compounds (NMVOCs) and odorants in the exhaust air from two tunnel-ventilated layer-chicken sheds that were configured with multi-tiered cages and manure belts. The study sites were located in south-eastern Queensland and the West Gippsland region of Victoria, Australia. Samples were collected in summer and winter on sequential days across the manure-belt cleaning cycle. Odour emissions ranged from 58 to 512 ou/s per 1000 birds (0.03–0.27 ou/s.kg) and dust emission rates ranged 0.014–0.184 mg/s per 1000 birds for PM10 and 0.001–0.190 mg/s per 1000 birds for PM2.5. Twenty NMVOCs were identified, including three that were also identified as odorants using thermal desorption–gas chromatography–mass spectrometry/olfactometry analysis. Odour emission rates were observed to vary with the amount of manure accumulation on the manure belts, being lowest 2–4 days after removing manure. Odour emission rates were also observed to vary with diurnal and seasonal changes in ventilation rate. Dust emissions were observed to increase with ventilation rate but not with manure accumulation. Some NMVOCs were identified at both farms and in different seasons whereas others were observed only at one farm or in one season, indicating that odorant composition was influenced by farm-specific practices and season.

Numerical study of the effects of cartridge shape on the reverse pulsed flow cleaning of pleated cartridge filters

2018 ◽  
Vol 233 (2) ◽  
pp. 371-383
Author(s):  
Shaowen Chen ◽  
Yun Gong
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Cylindrical Shape ◽  
Cleaning Performance ◽  
Pressure Fields ◽  
Reverse Pulse ◽  
Tank Pressure ◽  
Filter Cartridge ◽  
Pulse Jet

Patchy cleaning is one of the principal factors resulting in the reduction of the efficiency and quality of reverse pulse-jet cleaning as well as the service lifetime of filtration units. To resolve the above issues, a new pleated cartridge shape was introduced in this study to improve the cleaning efficiency and quality of pleated filter cartridges. To calculate the transient flow and pressure fields for a simple filtration system with one filter cartridge in the reverse pulse-jet cleaning process, an unsteady computational fluid dynamics model was developed via the commercial computational fluid dynamics software of ANSYS CFX. The transient static pressure fields for filter cartridges under four different pleated cartridge shapes were studied. The conventional cylindrical cartridge was selected as the base-model of filter cartridge and contrasted with other three cartridge shapes. It was found that the convergent–divergent cartridge was able to effectively improve the cleaning performance without the increase of tank pressure. Different pleated cartridge shapes are expected to be able to redistribute the pressure drop across the porous media along the filter height and to improve the flow behavior after pulsing gas releasing from the nozzle. For convergent–divergent cartridge shape, the peak pressure on the inner surface of porous media has an obvious increase and the peak pressure arriving time is earlier than other cases. It shows that the reverse flow has much more competence to remove the dust powder or cake from the porous media. At the same time, the area-averaged pressure drop at the bottom section of the filter has an increase of 50% under the cartridge with a convergent–divergent shape compared to that with a cylindrical shape. It is considered to enhance the cleaning mechanical stress at the bottom section of the filter cartridge. The better cleaning performance was observed in the medium, with 150% increase compared to that with a cylindrical shape. Furthermore, the cleaning performance gets improved because the value enhances on the top section. The redistribution of pressure drop observed is mainly because the special geometric construction of pleated cartridges compresses the flow on the medium and produce higher pressure drop there. Further studies indicate that the improved cleaning performance was observable under the consideration of the tank pressure reduction and variation of media permeability during each cleaning phase, and the change of pleated cartridge shapes can also improve the cleaning performance when combined with other improvement methods.

scholarly journals Modification and Performance Evaluation of Cleaning System for IAR Sorghum Thresher

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Nura A Sale ◽  
U S Muhammed ◽  
M A Gwarzo ◽  
S I Idris
Keyword(s):  
Agricultural Research ◽  
Block Design ◽  
Raw Material ◽  
Throughput Capacity ◽  
Cleaning Efficiency ◽  
Vertical Orientation ◽  
Cleaning Performance ◽  
Cleaning System ◽  
Randomized Complete Block Design ◽  
And Performance

Sorghum is a major source of food for most families and as raw material to many industries in Nigeria. Cleaning is among the most important post-harvest operation after threshing. However, manual cleaning of crop is quite tedious, time and labour intensive. A prototype thresher has already been developed at Institute of Agricultural Research (IAR) but yet it has been associated with many difficulties during operation. Among the problems of IAR prototype sorghum thresher are low operating performance such as higher scatter loss and low cleaning efficiency thus the need for modification to improve the above mentioned parameters. This study was undertaken to modify the cleaning system of the IAR sorghum thresher with the aim of minimizing the drudgery involved in its operation and to improve its performance. The major modifications were on shaking mechanism and sieves. The number of sieves was increased from one to three while the connecting rode for shaking mechanism was changed from horizontal to vertical orientation. The sizes of the pulleys were also changed. Randomized Complete Block Design (RCBD) experimental design was used for determining the effect of moisture content, speed and feed rate on the cleaning performance of the machine. The maximum performance achieved were 99.95 %, 5.45 %, and 250 kg/h for cleaning efficiency, scatter loss and throughput capacity respectively.

Comprehensive experimental investigation of hole cleaning performance in horizontal wells including the effects of drillstring eccentricity, pipe rotation and cuttings size

2021 ◽  
pp. 1-11
Author(s):  
Ahmed K. Abbas ◽  
Mortadha T. Alsaba ◽  
Mohammed F. Al Dushaishi
Keyword(s):  
Flow Rate ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
Real Field ◽  
Operational Parameters ◽  
Cleaning Efficiency ◽  
Hole Cleaning ◽  
Cleaning Performance ◽  
Pipe Rotation

Abstract Extended reach (ERD) wells with a horizontal and highly deviated section are widely applied in the oil and gas industry because they provide higher drainage area than vertical wells; and hence, increase the productivity or injectivity of the well. Among many issues encountered in a complex well trajectory, poor hole cleaning is the most common problem, which occurs mainly in the deviated and horizontal section of oil and gas wells. There are significant parameters that have a serious impact on hole cleaning performance in high-angle and horizontal sections. These include flow rate, rheology and density of the drilling fluid, drillstring eccentricity, pipe rotation, and cuttings size. It has been recognized that the action of most of these parameters to transport drilled cuttings is constantly a point of controversy among oilfield engineers. In the present study, extensive experiments were conducted in an advanced purpose-built flow rig to identify the main parameters affecting on circulate the cuttings out of the test section in a horizontal position. The flow-loop simulator has been designed to allow easy variation of operational parameters in terms of flow rate, mud density, drillstring eccentricity, pipe rotation, and cuttings size. In addition, the study covers the impacts of laminar, transition, and turbulent flow regimes. The goal of such variation in the operational conditions is to simulate real field situations. The results have shown that drill string rotation and flow rate were the operational parameters with the highest positive influence on the cuttings transports process. In contrast, drill pipe eccentricity has a negative influence on cuttings removal efficiency. The cuttings transportation performance is further improved by pipe rotation at different levels of eccentricity, especially at fully eccentric annuli. It was also shown that larger cuttings appeared to be easier to remove in a horizontal annulus than smaller ones. The experimental results would provide a more in-depth understanding of the relationship between drilling operation parameters and hole cleaning efficiency in ERD operations. This will help the drilling teams to realize what action is better to take for efficient cutting transportation.

CHARACTERIZATION OF TENACIOUS RESIDUE OF ALKALINE CIRCULATION CLEANING1

1974 ◽  
Vol 37 (9) ◽  
pp. 469-472 ◽  
Author(s):  
R. B. Maxcy ◽  
R. G. Arnold
Keyword(s):  
Alkali Concentration ◽  
Gas Liquid Chromatography ◽  
Laboratory System ◽  
Cleaning Efficiency ◽  
High Temperature Short Time ◽  
Efficiency And Effectiveness ◽  
Cleaning Cycle ◽  
Alkaline Cleaning ◽  
Short Time ◽  
Layer Chromatography

Circulation cleaning presents many opportunities for advancement in liquid food handling systems, but the effectiveness commonly must be evaluated by means other than visual inspection. To study this problem of evaluation, a laboratory system was developed to simulate the soiling and cleaning process of a commercial high-temperature short-time pasteurizer unit. Proof of similarity was obtained by determining quantity of soil at various cleaning intervals and through qualitative examination of the soil with thin-layer chromatography, gas liquid chromatography, and infrared spectroscopy. Lipoidal materials were found to be most resistant to alkaline cleaning. Material removed near the end of the cleaning cycle and material removed by ether rinse of the equipment after the cleaning cycle were similar to milkfat in the milk used for soiling and to the residues recovered from early intervals of cleaning. The removal process for lipoidal material was not attributable to saponification, because little saponification occurred with temperature and alkali concentration associated with circulation cleaning. Data in this paper indicated directions for further work toward criteria of cleaning efficiency and effectiveness.

On-line pulse-jet cleaning of pleated fabric cartridge filters for collecting pesticides

RSC Advances ◽  
2015 ◽  
Vol 5 (59) ◽  
pp. 48086-48093 ◽  
Author(s):  
Cuiping Yan ◽  
Mingxing Zhang ◽  
Longyuan Lin
Keyword(s):  
Operational Process ◽  
Cleaning Performance ◽  
On Line ◽  
Pulse Jet

Cleaning performance of pleated fabric cartridge filters for collecting pesticide particles and the effect of cleaning on system operational process.

The Experimental Study of Matching Between Centrifugal Compressor Impellers and Vaneless Diffusers for Turbochargers

2007 ◽  
Author(s):  
Hideaki Tamaki ◽  
Satoshi Yamaguchi
Keyword(s):  
Flow Rate ◽  
Peak Pressure ◽  
Pressure Rise ◽  
Positive Slope ◽  
Vaneless Diffuser ◽  
Effective Measure ◽  
New Correlation ◽  
Design Changes ◽  
Physical Effects ◽  
The Stability

The operating range of centrifugal compressors for turbochargers using vaneless diffuser is considered from measurements of the separate pressure rise of the impeller and the diffuser. In some cases, the peak pressure rise of the stage corresponds to the peak pressure rise of the impeller (which is considered to correspond to inducer stall). From these measurements a new correlation for the onset of inducer stall is proposed. In other cases the stability of the vaneless diffuser (defined as positive slope of the pressure rise versus flow characteristic) determines the stability of the stage. A 1D analysis of the pressure rise versus flow rate in a vaneless diffuser captures the main physical effects due to friction and provides a guide to the effect of design changes for increasing the range. Subsequent tests confirm that reduction of diffuser height is the most effective measure for reducing the surge flow rate.

Origin and mechanisms of dust emission from pulse-jet cleaned filter media

2009 ◽  
Vol 189 (1) ◽  
pp. 108-114 ◽  
Author(s):  
J. Binnig ◽  
J. Meyer ◽  
G. Kasper
Keyword(s):  
Dust Emission ◽  
Filter Media ◽  
Pulse Jet
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