scholarly journals IMPROVING THE EFFICIENCY OF DUSTING IN PRODUCTION PORTLAND CEMENT

2018 ◽  
Vol 1 (12) ◽  
pp. 93-96
Author(s):  
Nikolay Samohvalov ◽  
Yuliya Zykova
Keyword(s):  
Portland Cement ◽  
Hydraulic Resistance ◽  
The State ◽  
Operating Principle ◽  
Dust Collector ◽  
Ball Mills ◽  
Cleaning Efficiency ◽  
Dust Collection

The analysis of the state of dust collection in the production of Portland cement is presented. A new scheme of purification of aspiration air from ball mills, when crushing clinker, using slotted filters and jet-filtration dust collector. The description and operating principle of recommended dust collectors are given. This scheme will improve the cleaning efficiency and reduce the hydraulic resistance during dust collection.

scholarly journals Cleaning efficiency and hydraulic resistance of the jet filter dust collector

2019 ◽  
Vol 9 (4) ◽  
pp. 759-767
Author(s):  
Nikolay M. Samokhvalov ◽  
◽  
Vladimir V. Vinogradov ◽  
Yulia A. Zykova ◽  
◽  
...  
Keyword(s):  
Hydraulic Resistance ◽  
Dust Collector ◽  
Cleaning Efficiency ◽  
Filter Dust

scholarly journals PROCEDURE FOR DETERMINING HYDRAULIC JET BARBOTTER RESISTANCE FOR COLLECTING FINE DUST

2020 ◽  
pp. 706-712
Author(s):  
Григорий Иосифович Свердлик ◽  
Анжела Юрьевна Атаева ◽  
Амонд Рафаэлович Атаев
Keyword(s):  
Hydraulic Resistance ◽  
Dust Particles ◽  
Dust Collector ◽  
Dust Collection ◽  
State Technological ◽  
Zinc Production ◽  
Distribution Plate ◽  
Waelz Kiln ◽  
Technological University ◽  
Small Dust

В СКГМИ (ГТУ) разработана конструкция струйного барботера, в основу которого положена запатентованная конструкция основного узла аппарата -распределительной тарелки, позволяющей реализовать в барботере пенный режим. Данный пылеуловитель позволяет улавливать мелкие частицы пыли ( < 1 мкм), включая наночастицы, не улавливаемые в рукавных фильтрах. В статье приведена методика расчета гидравлического сопротивления барботера, необходимая для использования при выборе вентилятора для процесса пылеулавливания в барботере. Гидравлическое сопротивление барботера определяется как сумма составляющих: статического давления слоя жидкости, капиллярного перепада в зоне образования пузырьков и сопротивлений деталей распределительной тарелки. Разработанная методика была использована при проектировании технологической линии очистки газов от пылевидных возгонов вельц-печей цинкового производства, содержащих наночастицы. North Caucasian Institute of Mining and Metallurgy (State Technological University) has developed a design of a jet bubbler which is based on the patented design of the device main unit - a distribution plate, which allows to implement a foam mode in the bubbler. This dust collector allows you to capture small dust particles (< 1 microns), including nanoparticles, that are not captured in bag filters. The article presents a method for calculating the hydraulic resistance of the bubbler, which is required for use, when selecting a fan for the process of dust collection in the bubbler. The hydraulic resistance of the bubbler is defined as the sum of the components: the static pressure of the liquid layer, the capillary drop in the zone of bubbles formation and the resistances of distribution plate parts. The developed method was used in the design of a process line for cleaning gases from pulverized ascents of waelz kiln of zinc production containing nanoparticles.

Development of an Integrated Dust Collector and Local Exhaust Ventilation System for Controlling Industrial Mine Dust

2013 ◽  
Vol 824 ◽  
pp. 217-224
Author(s):  
E.O. Ifelola ◽  
D.J. Afu
Keyword(s):  
Material Selection ◽  
Ventilation System ◽  
Dust Control ◽  
Dust Collector ◽  
Cleaning Efficiency ◽  
Successful Operation ◽  
Airborne Dust ◽  
Local Exhaust Ventilation ◽  
Mine Environment ◽  
Fan Speed

Dust control in an enclosed mine environment is a fundamental key to personnel safety for boosting personnel productivity and enhancing successful operation, hence the need to design a dust control equipment to meet this crucial requirement. A laboratory-scale local exhaust ventilating system for the control of airborne dust in an enclosed mine environment was designed and fabricated. The design was carried out by considering various design criteria required for a well-ventilated enclosed mine environment. Material selection of the components was done by taking into cognisance the physical characteristics of the targeted dust. The system designed was fabricated and then test-ran with dry dust laden air stream in order to determine its cleaning efficiency with respect to variation in fan speed and dust grain size. It was observed that the cleaning efficiency of the machine was high at a higher fan speed and low grain sizes. The cleaning efficiency ranged from (63.9-44.0)% for dust particle sizes ranging from (62.5-125) to (1000-2000) μm with a mean fan suction of 0.958Pa. Thus, with this system, improved cleaning of dry dust-laden enclosed mine workplace could be achieved with increased rate of suction of smaller particle-sized dust.

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.

Vibration Study for Consolidation of Portland Cement Concrete

1997 ◽  
Vol 1574 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Shane Tymkowicz ◽  
Robert F. Steffes
Keyword(s):  
Portland Cement ◽  
The State ◽  
Department Of Transportation ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Research Project ◽  
Air Content ◽  
Radius Of Influence ◽  
Normal Speed

The Iowa Department of Transportation has discovered an increase in the occurrence of excessively vibrated portland cement concrete (PCC) pavements. The overconsolidation of PCC pavements has been observed in several projects across the state. Overconsolidation is also believed to be a factor in acceleration of premature deterioration of at least two pavement projects in Iowa. To address the problem, a research project in 1995 documented the vibratory practices of PCC slipform paving in Iowa in order to determine the effect of vibration on consolidation and air content of pavement. Paver speed, vibrator frequency, and air content relative to the location of the vibrator were studied. The study concluded that the Iowa Department of Transportation specification of 5,000 to 8,000 vibrations per minute (vpm) for slipform pavers is effective for normal paver speeds on the three projects that were examined. Excessive vibration was clearly identified on one project where a vibrator frequency of 12,000 vpm was discovered. When the paver speed was reduced to half the normal speed, hard air contents indicate that excessive vibration was beginning to occur in the localized area immediately surrounding the vibrator at a frequency of 8,000 vpm. The study also indicates that the radius of influence of the vibrators is smaller than has been claimed.

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 STUDY OF THE INFLUENCE OF CONSTRUCTION AND MODE PARAMETERS ON THE HYDRODYNAMICS OF A HOLLOW VORTEX APPARATUS

2021 ◽  
pp. 47-50
Keyword(s):  
Pressure Drop ◽  
Hydraulic Resistance ◽  
Liquid Flow ◽  
Gas Flow ◽  
Efficient Design ◽  
Contact Heat ◽  
Dust Collection ◽  
Hollow Vortex ◽  
Gas Liquid Flow ◽  
Vortex Apparatus

The research was to determine the more efficient design of the swirler from the point of view of hydrodynamics and heat and its optimal parameters. Various swirl designs were manufactured and tested. After preliminary studies conducted on a laboratory installation with a glass working apparatus, several swirlers were selected taking into account their hydraulic resistance, the structure of the swirling gas-liquid flow, and the amount of liquid entrainment by gas. The results of an experimental study of the hydrodynamics of a hollow vortex apparatus with one and two tangential and axial swirlers. Hydraulic losses in the channel and in the swirls during the direct downward movement of gas and gas-liquid flow are determined. In addition, studies of the hydraulic resistance of a vortex-type device allow us to determine the energy consumption of this device for conducting complex processes of dust collection and absorption or contact heat exchange. The hydraulic resistance in the presence of a liquid film is higher than in the case of a single-phase gas flow. The pressure drop in the studied vortex apparatus does not exceed the resistance of high-performance cyclones and vortex-type devices of other designs. The effect of the twist coefficient of gas swirlers, gas velocity, and liquid flow on the pressure drop in the vortex apparatus is established

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 Pathological Changes in Internal Organs after Blocking Low Hydraulic Resistance Channels along the Stomach Meridian in Pigs

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Wen-Ting Zhou ◽  
Shu-Yong Jia ◽  
Yu-Qing Zhang ◽  
Yu-Ying Tian ◽  
Guang-Jun Wang ◽  
...  
Keyword(s):  
Hydraulic Resistance ◽  
The State ◽  
Pathological Changes ◽  
Internal Organs ◽  
Stomach Meridian ◽  
Normal States ◽  
Low Hydraulic Resistance ◽  
Insight Into ◽  
Experimental Pigs

Objective.The correlation between meridians and organs (Zang-fu) is an important aspect of meridian theory. The objective of this paper is to investigate the pathological changes in the organs resulting from blocking low hydraulic resistance channel (LHRC) along the stomach meridian by injecting gel in pigs so as to offer some insight into the correlation between meridians and internal organs.Methods.Four white piglets and twelve black minipigs were divided into four batches and were observed in different periods. Each batch included two pairs of pigs and each pair matched two pigs with similar conditions among which gel was injected into 6~8 low hydraulic resistance points along the the stomach meridian in the experimental pig and the same amount of saline was injected into the same points in the control pig. The state of stomach and intestine was observed 6~10 weeks after the blocking model was developed.Results.The results showed that there were bloated stomach or/and intestine in all the experimental pigs while there were normal states in seven control pigs except one dead during the experiment.Conclusion.The findings confirmed that the blockage of LHRC along the stomach meridian can influence the state of stomach and intestine, leading to a distension on stomach or/and intestine.

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