scholarly journals Application and Research of Swirling Curtain Dust Collection Technology in Mines

2020 ◽  
Vol 10 (6) ◽  
pp. 2005 ◽  
Author(s):  
Gang Li ◽  
Jinhua Hu ◽  
Xiaoli Hao ◽  
Huaidi Qu
Keyword(s):  
Health And Safety ◽  
Dust Removal ◽  
Water Volume ◽  
Dust Collector ◽  
Potential Hazard ◽  
Dust Collection ◽  
Metal Mine ◽  
Transfer Station ◽  
Air Speed ◽  
Low Efficiency

During the production process in mines, large amounts of dusts are produced. The dusts pose a potential hazard to the health and safety of miners. Traditional dust removal methods, such as ventilation, water sprays and foam technology, cannot completely solve the problem of dust pollution, due to low efficiency or high consumption of water or large resistance (>2000 Pa). Therefore, a swirling curtain dust collector (SCDC) was proposed to collect the dust in mines. The device was combined swirling atomization with spray curtain for dust removal. The performance of SCDC was investigated. According to the results, the optimum working condition of the device was: air pressure: 0.35 MPa, water volume: 30 L/h; liquid–gas ratio: 0.15 L/m3; air speed: 14–16 m/s. Under these operation parameters, the suppression efficiency of total dust and respirable dust were over 99.8% and 97%. The proposed device was applied at transfer stations of Luohe Metal Mine in Anhui, China. The application results showed that the dust concentration at the outlet of SCDC in the transfer station is lower than 20 mg/m3, which is stipulated by Chinese standard GB 28661-2012. The proposed device is expected to replace the traditional Venturi wet scrubber in mines.

scholarly journals Design and Optimum of Dust Collector with Corrugated Plate for Underground Mine

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Ming Li ◽  
Chao Wu ◽  
Zhi-yong Zhou ◽  
Wei-chun Lian ◽  
Zhi-xiong Chen
Keyword(s):  
Removal Efficiency ◽  
Three Dimensional ◽  
Surface Characteristics ◽  
Dust Removal ◽  
Dust Collector ◽  
Dust Collection ◽  
Ansys Fluent ◽  
Metal Mine ◽  
Lead Zinc ◽  
Dimensional Simulation

A set of dust collectors was designed with corrugated plate for an underground metal mine, which has low ventilation resistance, simple maintenance, and strong environmental adaptability. A three-dimensional simulation model was built based on ANSYS-Fluent software, and it was used to analyze the influence law of key parameters on the comprehensive dust removal efficiency; the angle of corrugated plate to the horizontal plane, the surface characteristics of plate, pressure loss and dust removal efficiency were discussed. The optimal design scheme of the dust collector was determined according to the simulation results. The dust collection was carried out in the Fankou lead-zinc underground metal mine in China, and the total dust removal efficiency was more than 95%, and for respiratory dust, it was more than 85%. This dust collector can be widely used in similar underground metal mines.

Dust Collection Validity and Effect of Hole Shape Accuracy of CFRP with Developed Hollow-Type Drill and Dust Collector

2016 ◽  
Vol 10 (3) ◽  
pp. 324-333 ◽  
Author(s):  
Masahiro Hagino ◽  
◽  
Takashi Inoue ◽  
Masanobu Mizoguchi ◽  
Wataru Aoki ◽  
...  
Keyword(s):  
Health And Safety ◽  
Machining Accuracy ◽  
Dust Collector ◽  
Dust Collection ◽  
Shape Accuracy ◽  
Collection Rate ◽  
Hole Shape ◽  
Spindle Unit ◽  
Reinforced Plastic ◽  
Boring Hole

The drilling of carbon fiber-reinforced plastic (CFRP) has many important aspects, such as collecting the fine cutting chips. Serious problems relating to machining accuracy can arise when the fine cutting chips diffused into the air are deposited or mixed in the sliding surface and spindle unit of a machine tool. Moreover, the environmental aspects of fine cutting chips can seriously affect the health and safety of workers. Our group has developed a new hollow-type drilling device with a cyclone-type dust collection system, which aspirates and ejects fine cutting chips from a penetration hole in the central part of the drill shank to outside the cutting area. We produced the tools with drills both without a point angle for the counter-boring hole processing and with a point angle for general drilling. In this study the effect of the dust collection rate for cutting chip and the drilling hole shape accuracy are evaluated for the hollow-type drill with two different cutting edge shapes. The results demonstrate the possibility of suppressing the occurrence of fine cutting chips when the hollow-type drill edge is similar to the shape of general twist drill edges. The hole-finish surface properties were improved, and we obtained a higher dust collection rate.

scholarly journals Experimental study on production and emission characteristics of PM2.5 from industrial fluidized bed boilers

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2665-2675
Author(s):  
Songsong Zhang ◽  
Qian Du ◽  
Guoli Qi
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Mass Concentration ◽  
Great Influence ◽  
Chemical Properties ◽  
Dust Removal ◽  
Dust Collector ◽  
Bag Filter ◽  
Physical And Chemical ◽  
Fluidized Bed Boilers

Particle size distributions, concentrations, morphological characteristics, and elemental compositions of eight fluidized bed boilers with different capacities and different dust collectors were determined experimentally. The PM2.5 particle concentration and mass concentration were monitored in real-time before and after the boiler dust collector by electric low pressure impactor, and the physical and chemical properties of PM2.5 were analyzed by membrane sampling. We found that the PM2.5 particle concentration produced by industrial fluidized bed boilers displayed bimodal distributions, peaking at 0.2 ?m and 0.76 ?m, the formed mechanism of these two parts particles is vaporization-condensation of mineral matter and residual ash particles and the adsorbent wear or tear. Mass concentration exhibits a single peak characteristic with a peak at 0.12 ?m. The removal efficiency for PM2.5 of dust collectors varies with different dust removal mechanisms. The electrostatic precipitator and bag filter have high dust removal efficiency, and the water film dust collector has low dust removal efficiency. The normal operation of the bag filter has a great influence on the dust removal efficiency. The physical and chemical properties of PM2.5 showed that the single-particle morphology was mainly composed of irregular particles, containing a small amount of solid spherical particles and more agglomerates. The content of Si and Al in PM2.5 elemental analysis is the highest, which decreases after a dust collector. Some fluidized bed boilers use desulfurization in the furnace, which has great influence on the mass concentration of Ca and S elements, and the lowest Hg content in trace elements, about a few ppm. <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/TSCI200901242E">10.2298/TSCI200901242E</a><u></b></font>

Study on a Photovoltaic Lunar Dust Removal System Based on the Photovoltaic Effect of PLZT

2017 ◽  
Author(s):  
Jing Jiang ◽  
Hong-Yue Zhao ◽  
Jin-Cheng Ding ◽  
Hong-Hao Yue ◽  
Xu-Yan Hou
Keyword(s):  
Ultraviolet Light ◽  
Removal Efficiency ◽  
Electrostatic Force ◽  
Photovoltaic Effect ◽  
Dust Removal ◽  
Dust Collector ◽  
Optical Elements ◽  
Lunar Dust ◽  
Protected Surface ◽  
Removal System

The deposition of lunar dust on the surface of solar panels and optical elements is one of the most important problems need to be solved in lunar exploration. This paper will propose an initiative lunar dust removal system based on the photovoltaic effect of PbLaZrTi (PLZT), which is activated by the ultraviolet light extracted from sun light at the lunar surface. When ultraviolet light with a wavelength near 365nm illuminates on polarized PLZT materials, high voltages of several kilovolt per centimeter can be generated between two electrodes of PLZT. When two electrodes of PLZT are connected to a lunar dust collector (LDC) and the ITO film of protected surface respectively, an electrostatic field forms between LDC and the protected surface. Coulomb forces over particles will overcome gravitational force and surface forces, so the particles can be absorbed to LDC and removed by LDC finally. Based on the equivalent electrical model, mathematical model of electrostatic force is derived when the lunar removal electric field is acted either by single piece PLZT or by multi-pieces PLZT which are connected in parallel. Experimental platform is set up to prove the feasibility of this lunar dust removal system. In order to improve the removal efficiency, a novel configuration design of LDC based on multi-PLZT patched is proposed and its removal efficiency is evaluated by experiments.

Study on the Design of Venturi Scrubber on Metal Mine

2014 ◽  
Vol 556-562 ◽  
pp. 1087-1091
Author(s):  
Shi Bin Wang ◽  
Ri Hui Chen ◽  
Xiang Yun Meng
Keyword(s):  
Diesel Exhaust ◽  
High Efficiency ◽  
Diesel Exhaust Particles ◽  
Solid Particles ◽  
Dust Collector ◽  
Venturi Scrubber ◽  
Mine Dust ◽  
Metal Mine ◽  
Pilot Programs ◽  
Exhaust Particles

Venturi scrubber is a high-efficiency wet dust collector,and has a high capture efficiency for small solid particles. Applied to metal mines, the venturi scrubber not only eliminate the mine dust in the processes of mining and driving, but also can capture the diesel exhaust particles effectively in theory. Then the air in the mine has been purified and the staff can keep away from the harm of mine dust and diesel exhaust particles. Based on the results of this research from the predecessor, the paper design a reasonable set of pilot programs for mine workers.

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.

scholarly journals IDENTIFIKASI HAZARDPADA PEKERJA KONTRAKTOR SIPIL DENGAN METODE CSMS DI PT. X PASURUAN

2017 ◽  
Vol 6 (1) ◽  
pp. 88
Author(s):  
Tanti Olivina Sari
Keyword(s):  
Management System ◽  
Safety Management ◽  
Health And Safety ◽  
Management Systems ◽  
Potential Hazard ◽  
Safety Management Systems ◽  
Collection Method ◽  
Work Activities ◽  
Evaluation Stage ◽  
Civilian Contractors

Hazard is always available on every work process in the workplace and each hazard has a different level of potential  hazard, and therefore needs to be done identification hazard. Contractor Safety Management System (CSMS) Program in PT. X applied to prevent and suppress the occurrence of a hazard to the civilian contractors. This study was conducted  to identify the hazard to workers civilian contractors using CSMS PT. X Pasuruan. This research was an observational descriptive and presented in the narrative. Identification of hazard in stage are pre-work activities and execution of work  at civilian contractor PT. X Pasuruan. The data collection method was by observation, indepth interview, and interviews. The results showed on the stage of pre-employment activities PT.1 as a civilian contractor company in cooperation with PT. X Pasuruan, meets only 14 subjects (93.3%). At the stage of implementation of the work there are two items that realization is not achieved, and at the final evaluation stage there are three items that are below 80% votes and does not meet the requirements. Risk of harm to the contractor civilians in the workplace can be prevented to a minimum, it was because a good management system in the company. Companies obedient in carrying CSMS program regulating health and safety management systems of work, by making the program a monitoring schedule for the work progresses and increasing Awareness to contractors, by providing training in occupational health and safety aspects.Keywords: identification, potential hazard

scholarly journals Study of dust collection effectiveness in cyclonic-vortex action apparatus

2021 ◽  
Vol 1 (3(57)) ◽  
pp. 21-25
Author(s):  
Andrei Torsky ◽  
Alexander Volnenko ◽  
Leonid Plyatsuk ◽  
Larysa Hurets ◽  
Daulet Zhumadullayev ◽  
...  
Keyword(s):  
Turbulent Diffusion ◽  
Particle Deposition ◽  
High Efficiency ◽  
Collection Efficiency ◽  
Dust Collector ◽  
Fine Dust ◽  
Dust Collection ◽  
Contact Stage ◽  
Fractional Efficiency ◽  
Overall Efficiency

The object of research is the efficiency of dust collection of fine dust in an apparatus with an intense turbulent mode of phase interaction. One of the most problematic areas of the existing dust and gas cleaning equipment is the low efficiency of collecting fine dust. Effective cleaning of exhaust gases from dust involves the use of multi-stage cleaning systems, including wet and dry dust cleaning devices, which entails high capital and operating costs. These disadvantages are eliminated in the developed design of the cyclone-vortex dust collector with two contact zones. The device implements both dry and wet dust collection mechanisms, which allows for high efficiency of dust removal at high productivity. The conducted studies of the total and fractional efficiency of dust collection when changing the operating parameters of the developed device showed that the efficiency of collecting fine dust is 98–99 %. The increase in the efficiency of dust collection in the dry stage of the device is due to an increase in centrifugal force. In the wet stage of contact, the efficiency reaches its maximum values due to the vortex crushing of the liquid in the nozzle zone of the apparatus. Studies of the fractional efficiency of the apparatus show that with an increase in the diameter of the captured particles, the efficiency of the dust collection process for dry and wet stages, as well as the overall efficiency, increases. With an increase in the density of irrigation, the overall efficiency of dust collection in the apparatus increases. It has been established that an increase in the efficiency of capturing highly dispersed particles occurs due to turbulent diffusion, the value of which is determined by the frequency of turbulent pulsations and the degree of entrainment of particles during the pulsating motion of packed bodies. To describe the results obtained, a centrifugal-inertial model for a dry contact stage and a turbulent-diffusion model of solid particle deposition for a wet contact stage are proposed, which make it possible to calculate the dust collection efficiency of the contact stages, as well as the overall efficiency of the cyclone-vortex apparatus. The results obtained show the prospects of using devices of this design at heat power plants and other industries.

scholarly journals Comparative analysis of air scouring and unidirectional flushing of water distribution systems

2020 ◽  
Vol 69 (6) ◽  
pp. 578-590
Author(s):  
Florent Pourcel ◽  
Sophie Duchesne
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems ◽  
Total Suspended Solid ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Water Volume ◽  
Particle Removal ◽  
Suspended Solid Concentration ◽  
Low Efficiency

Abstract Unidirectional flushing is a widely used method to remove sedimented particles from water distribution systems and prevent water discolouration events. However, it shows low efficiency in cases of high pressure losses, usually requires large volumes of water, and does not remove incrustations. Air scouring is known for being very effective in particle removal with minimal impacts from pressure loss, requiring little water and improving hydraulic capacities by removing soft incrustations. Flushing sequences of unidirectional flushing and air scouring were performed in similar conditions on 18 pipe sections from four water distribution networks located in the province of Quebec, Canada; unidirectional flushing was also performed on 14 additional pipe sections located in three other water distribution networks. Total suspended solid concentration of flushed water, water flow and pressure were recorded to estimate the amount of flushed particles, the required water volume and the evolution of hydraulic capacities. Within the studied networks, the water requirements for air scouring were approximately 8-fold less than for unidirectional flushing and did not significantly improve the hydraulic capacity of the cleaned pipes.

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