scholarly journals Prediction of Particle-Collection Efficiency for Vacuum-Blowing Cleaning System Based on Operational Conditions

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 809 ◽  
Author(s):  
Yuan Xi ◽  
Yan Dai ◽  
Xi–long Zhang ◽  
Xing Zhang
Keyword(s):  
Pressure Drop ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Collection Efficiency ◽  
Particle Separation ◽  
Separation Performance ◽  
Dust Collection ◽  
Operational Conditions ◽  
Dust Collection Efficiency ◽  
Traveling Speed

The dust-collection system, as the core of a sweeper vehicle, directly inhales dust particles on the pavement. The influence of variable operational conditions on particle-separation performance was investigated using computational fluid dynamics (CFD) Euler–Lagrange multiphase model. The particle-separation performance efficiency and retention time were used to evaluate the dust-collection efficiency. The uniform design (UD) and multiple regression analysis (MRA) methods were employed to predict and optimize the effects of reverse-blowing flow rate, pressure drop, and traveling speed on separation efficiency. The results indicated that the dust-collection performance initially increased and then decreased with increasing reverse-blowing flow rate. As the pressure drop increased, there was an increase in total dust-collection efficiency. However, the efficiency decreased with increasing traveling speed. The regression model showed that the proposed approach was able to predict the particle collection efficiency accurately. In addition, the optimum operational conditions were obtained, namely a reverse-blowing flow rate of 2100 m3/h, a traveling speed of 5 km/h, and a pressure drop of 2400 Pa. The maximum particle-separation efficiency was 99.10%, which showed good agreement with the experimental results.

Characteristics on High Temperature Particulate Clean Up in a Pilot Scale Vitrification Plant

2003 ◽  
Author(s):  
S. C. Park ◽  
T. W. Hwang ◽  
J. H. Ha ◽  
H. S. Kim
Keyword(s):  
High Temperature ◽  
Pressure Drop ◽  
Collection Efficiency ◽  
Pilot Scale ◽  
Initial Time ◽  
Dust Collection ◽  
Filter Surface ◽  
Ceramic Candle Filter ◽  
Face Velocity ◽  
Dust Collection Efficiency

Characteristics of high temperature filter system were evaluated and the operation parameters were identified through a series of tests by the ceramic candle filter elements. At the first time of the tests, the trend of the pressure drop across the filter was increased sharply. But due to the growth of dust cake on the surface of filters it became stabilized to a certain level soon. The pressure drop was increased by the face velocity strongly. The permeability of the filter element decreased rapidly in the initial time but because the deposition and it also became stable as time goes on. Dust collection efficiency of the filter was higher than the designed value of 99.9%. Dust cleaning of the filter surface was effective under the back flushing pressure range of 1 to 5 bar. Finally, at the long-term vitrification test, no specific defect or failure were occurred to the ceramic candle filter. Based on the test results, the performance and durability of the ceramic candle filter was proved as sound.

Experimental Study on the Droplet Separation Performance of PTFE Demister

2014 ◽  
Vol 644-650 ◽  
pp. 5252-5255
Author(s):  
Feng Ming Zhang ◽  
Dong Dong Feng ◽  
Yu Xu ◽  
Xiao Bin Pei ◽  
Shun Quan Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Steam Flow ◽  
Separation Performance ◽  
Steam Flow Rate

An experiment setup was built to test the droplet separation performance of demister. Different experiments were conducted using various Polytetrafluoroethene (PTFE) meshes. Results show that the separation efficiency of demister is dependent on screen thickness, mesh count. Pressure drop increases with the increase of steam flow rate and screen thickness.

A Potential Precipitating Apparatus and its Performance Measuring

2013 ◽  
Vol 389 ◽  
pp. 378-382
Author(s):  
Ling Shi ◽  
Cheng Wu Yang ◽  
Xin Ming Yu ◽  
Xian Wei Luo ◽  
Hong Mei Chen
Keyword(s):  
Pressure Drop ◽  
Collection Efficiency ◽  
Dust Removal ◽  
Respirable Dust ◽  
Dust Collection ◽  
Experimental Platform ◽  
Wet Condition ◽  
New Apparatus ◽  
Dust Precipitator ◽  
Dust Collection Efficiency

A new apparatus which is the disc with the radiant fine stainless-steel filament is potential removal of dust apparatus by the analysis of dust removal. To evaluate its performance of dust removal, the experimental installation is built, the dust collection efficiency under dry and wet condition, the pressure drop, is measured in the experimental platform. It is also designed the wet dust precipitator and applied to the control of dust in mine tunnel. Results show that the disc is better dust collection efficiency under wet condition than under dry condition, the respirable dust collection efficiency is more than 80 percent averagely, and its pressure drop is also lower. Though these measures are initial, it is convincing that the disc can served as a part of precipitator by optimum design.

Dust Collection Performance of Bag Filters in Rice Processing Facilities

2019 ◽  
Vol 62 (6) ◽  
pp. 1467-1473
Author(s):  
Hoon Kim ◽  
Oui Woung Kim ◽  
Hyo Jai Lee ◽  
Jae Hwan Ahn
Keyword(s):  
Pressure Drop ◽  
Collection Efficiency ◽  
Filter Medium ◽  
Average Error ◽  
Maximum Pressure ◽  
Correlation Equations ◽  
Bag Filter ◽  
Dust Collection ◽  
Dust Collection Efficiency ◽  
Rice Processing

HighlightsThe 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.

scholarly journals Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

2020 ◽  
Vol 21 (6) ◽  
pp. 618
Author(s):  
Yuan Xi ◽  
Yong-liang Zhang ◽  
Xi-long Zhang ◽  
Yan Dai
Keyword(s):  
Inclination Angle ◽  
Collection Efficiency ◽  
Structural Parameters ◽  
Separation Performance ◽  
Dust Collection ◽  
Detention Time ◽  
Inhaled Particles ◽  
Cleaning System ◽  
Motion Characteristics ◽  
Dust Collection Efficiency

The vacuum-blowing cleaning system, utilizing positive and negative pressure mixed-delivery theory, has been adopted for the road sweeper vehicle. To enhance the solid particle separation performance and to evaluate the motion characteristics of inhaled particles under different structural parameters, the gas-solid flow in the vacuum-blowing cleaning system was investigated by using computational fluid dynamics (CFD) technology. The influence of the main structural parameters on the grade dust collection efficiency and average detention time of the inhaled particles was determined, such as suction-inlet diameter, suction-inlet inclination angle, and front baffle inclination angle. And the interplay between them was also investigated. In addition, a dust collection efficiency model was built, based on uniform design (UD) and multiple regression analysis (MRA), and subsequently verified via experiments. The results revealed that the structural parameters have significant influence on the dust collection performance. The suction-inlet diameter, front baffle inclination angle, and suction-inlet inclination angle exerted the highest, second-highest, and lowest influence, respectively. Furthermore, the interaction among structural parameters also influenced the collection performance. The highest, second-highest, and lowest levels of influence were determined for the inlet diameter/baffle inclination angle, inlet inclination angle/baffle inclination angle, and inlet diameter/inlet inclination interactions, respectively. The highest dust collection efficiency (i.e., 96.10%) and a short average detention time of particles in the chamber were realized under the following conditions: suction-inlet diameter and inclination angle: 200 mm and 110°, respectively, and front baffle inclination angle: 105°.

scholarly journals Performance Testing of HTHP Electrostatic Precipitator at NYU PFBC Facility

1988 ◽  
Author(s):  
R. Radhakrishnan ◽  
P. K. Gounder ◽  
S. Kavidass ◽  
V. Zakkay ◽  
R. Dellefield
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Operating Experience ◽  
Performance Testing ◽  
Test Facility ◽  
Dust Collection ◽  
Ongoing Research ◽  
Dust Collection Efficiency

NYU has an ongoing research program which is being funded by DOE to test three types of high-pressure, high-temperature filters. The main objectives of the testing program are: (1) to establish the performance capability of the filters under high-pressure and high-temperature conditions; and (2) to evaluate the dust collection efficiency. Shakedown tests for a duration of about 50 hours was completed during October 1986. Testing of the electrostatic precipitator (ESP) is in progress. The first test with ESP was performed during the middle of November 1986. The operating experience with respect to the test facility, and in particular with the particulate sampling systems, is reported in this paper. Additionally, some test results are also discussed.

Cyclic Flow Experiments of a Fine Particle Separation Hydrocyclone

2007 ◽  
Author(s):  
Lixin Zhao ◽  
Minghu Jiang
Keyword(s):  
Flow Condition ◽  
Fine Particle ◽  
Fine Particles ◽  
Separation Efficiency ◽  
Amplitude Ratio ◽  
Particle Separation ◽  
Separation Performance ◽  
Period Ratio ◽  
Cyclic Flow ◽  
Signal Type

Basic separating principle of hydrocyclones and the cyclic experimental research facilities are introduced. The difficulty of separating fine particle is described. Based on a solid-liquid hydrocyclone used for separating fine particles, effect of cyclic flow condition on hydrocyclone’s performance is studied. Effects of cyclic period ratio, cyclic flowrate amplitude ratio, Reynolds number, gas liquid ratio, and the cyclical signal type on the hydrocyclone’s fine particle separation performance, especially on relative overflow purifying rate were studied in detail. The results show that the separation efficiency of the hydrocyclone operated under cyclic flow condition can be higher than that in steady condition, when the cyclic period ratio is about 0.68 and the cyclic flowrate amplitude ratio is about 2%. Rectangular wave seems to be the best cyclic signal for enhancing the hydrocyclone’s separation efficiency. The cyclical change of flowrate leads to the increasing of hydrocyclone’s energy consumption to some extent, while the increasing amount is very less, which is no more than 3% in general.

scholarly journals Dust emissions’ reduction into the atmosphere by environmental-engineering systems of smallsize devices with counter-swirling flows (CSF)

2019 ◽  
Vol 138 ◽  
pp. 01037
Author(s):  
N.M. Sergina ◽  
A.A. Sakharova ◽  
V.N. Azarov ◽  
D.V. Azarov ◽  
M.A. Nikolenko
Keyword(s):  
Collection Efficiency ◽  
Swirling Flows ◽  
Environmental Engineering ◽  
Emissions Reduction ◽  
Dust Collector ◽  
Engineering Systems ◽  
Collection System ◽  
Dust Collection ◽  
Dust Emissions ◽  
Dust Collection Efficiency

The article discusses the features of using environmentalengineering systems of small-size devices with counter-swirling flows (CSF) to reduce dust emissions into the atmosphere. The reasons for the decrease of the dust collection efficiency by CSF systems are analyzed. The layout diagram of the dust collection system with CSF devices and the organization of suction from the dust collector hopper are given.

Study of the Particle Separation Performance of a Dust-settling Hopper

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Bofu Wu ◽  
Jinlai Men ◽  
Jie Chen
Keyword(s):  
Fluid Dynamics ◽  
Particle Concentration ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Numerical Study ◽  
Particle Separation ◽  
Separation Performance ◽  
Particle Removal ◽  
Airflow Velocity ◽  
Calculation Results

This paper presents a numerical study to predict the particle separation performance of a dust-settling hopper using computational fluid dynamics. The Euler-Lagrange approach was employed to analyze the particle separation efficiency and the outflow particle concentration of the dust-settling hopper under different inlet airflow velocities. The calculation results obtained reveal that the overall particle separation efficiency and the outflow particle concentration decrease with the increase of the inlet airflow velocity, and the particle grade efficiency increases with particle size. Since there is a paradox between the particle separation performance and the particle removal performance for a street vacuum sweeper, it is necessary to counter-balance the effects of the inlet airflow velocity on them. According to the simulation analysis, an appropriate inlet airflow velocity is provided for the design of the dust-settling hopper.

Sign in / Sign up

Export Citation Format

Share Document