Ensuring the eco safety of mixing departments steel melting shops

2021 ◽  
pp. 45-51
Author(s):  
V. Kravets ◽  
◽  
S. Padalko ◽  
V. Gorovenko ◽  
◽  
...  
Keyword(s):  
Cast Iron ◽  
Nitrogen Supply ◽  
Dust Collector ◽  
Steel Melting ◽  
Compartment System ◽  
Gas Cleaning ◽  
Aspiration System ◽  
Purification Efficiency ◽  
Low Emission ◽  
New Construction

Introduction. Mixer branches of metallurgical enterprises are an intermediate link between blast furnace and steelmaking workshops. They are equipped with mixers – footer containers for storing cast iron melt. In Ukraine, mixers with a capacity of 1300 or 2500 tons are used. Technological operations are accompanied by emissions of finely dispersed brown smoke and large-dispersed graphite dust into the atmosphere. Problem. Mixer compartments of Ukrainian factories are equipped with aspiration systems that dimity emissions from cast iron pouring and draining units with the help of fume tubes, then emissions pass the dust collector and discharge into the atmosphere through a chimney. The main impact of mixer compartments on the environment is: disorganized emission through an aerodynamic dust lamp, which is not allotted by the aspiration system; organized emission through a smoke pipe of dust not caught by a dust collector; solid waste from gas cleaning and dust hoppers settling on the floor and structures of the mixer compartment from the disorganized ejection that did not come out through the lantern. The main problems are insufficient aspiration (disorganized emission) and low emission purification efficiency (emission through the chimney). A separate problem is the disposal of caught dust. The degree of aspiration in the factories of Ukraine is about 0.7 for the filling unit in the mixer and 0.8 for the drain unit from the mixer at the power of the aspiration system 150-250 thousand tons. This does not meet modern requirements. Results. Cyclones are used as a dust collector in most factories, which completely capture graphite, but are not effective enough for brown smoke. Therefore, it is proposed to use sleeve filters or electro filters. It is also possible to introduce the suppression of brown smoke with nitrogen. The use of nitrogen is possible in accordance with cyclones (for existing systems) or compatible with filters (during reconstruction or new construction). The use of suppression of brown smoke with nitrogen allows to solve the problem of disposal of caught dust, because nitrogen supply leads to enrichment of dust with graphite. The content of graphite increases from 15% to more than 30%, which converts dust from care to commodity product. Keywords: mixer, cast iron pouring, cast iron drainage, dust suppression by nitrogen, aspirational mixer compartment system.

scholarly journals The examination of the aspiration system of the casting yard, bunker overpass, receiving device with transshipment units of the blast furnace «Rossiyanka»

2019 ◽  
Vol 3 ◽  
pp. 20-27
Author(s):  
SHushlyakov D.A. ◽  
Kubyshkin A.V. ◽  
Soldatov D.A.
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Suspended Solids ◽  
Gas Content ◽  
Iron And Steel ◽  
Gas Cleaning ◽  
Aspiration System ◽  
Quality Product ◽  
Maximum Allowable Concentrations ◽  
Iron And Steel Works

Problems in existing suction systems of casting yard, bunker rack, receiving device with transshipment units of blast furnace number 7 «Rossiyanka» of Novolipetsk Iron and Steel Works are considered. It is noted that the design capacity of the blast furnace was 9 450 tons of cast iron per day, and the blast furnace produces about 13 000 tons of cast iron per day now. The aspiration system was not designed for such a load. The increased dustiness and gas content at the workplaces leads to a number of problems: health of the plant's employees, decrease in product quality, product losses, decrease in labor productivity. It is noted that the dustiness of the air in some points of the workplace of the casting yard exceeds the maximum allowable concentration by 1.2...6 times (which is 7.2...36 mg/m3). The issues of reconstruction of existing suction systems, repair or replacement of installed equipment, improvement of local suction systems are considered. The whole range of activities carried out in the foundry yard and other processing facilities will reduce the dust concentration in the working area to the level of maximum allowable concentrations. Ways to reduce the amount of suspended solids emissions into the atmosphere to the level of 5 mg/m3 on the proposed additional gas cleaning systems are proposed. The proposed reconstructive measures will reduce the total quantity of solid emissions to the atmosphere of Lipetsk by an amount of about 1 794 kg/hour or 11 481 600 kg/year.

scholarly journals ДОСЛІДЖЕННЯ ДИСПЕРСНОГО СКЛАДУ ПИЛУ ПРИ ВИРОБНИЦТВІ ТЕПЛОІЗОЛЯЦІЙНИХ МАТЕРІАЛІВ

World Science ◽  
2019 ◽  
Vol 1 (2(42)) ◽  
pp. 18-23
Author(s):  
Гаджиєв Едуард Назімович
Keyword(s):  
Thermal Insulation ◽  
Raw Materials ◽  
Mineral Wool ◽  
Fine Dust ◽  
Atmospheric Air ◽  
Gas Cleaning ◽  
Insulation Materials ◽  
Aspiration System ◽  
Cleaning Equipment ◽  
Selection Of

The problem of air pollution with environmentally hazardous dust with a particle size of up to 10 microns at plants for the production of thermal insulation materials is considered. The purpose of this work is to study the dispersed composition of dust in the production of insulation materials (such as mineral wool), and to determine the effectiveness of the existing gas cleaning equipment, which traps pollutants. The dispersed composition of the dust generated at the plant for the production of thermal insulation materials, and the dispersed composition of the dust collected by the dust-cleaning equipment was investigated. Experimentally and with the use of computer programs, it has been established that the efficiency of extracting fine dust from dust- cleaning equipment does not exceed 78%. It is established that the dust of mineral wool entering the aspiration system is dominated by particles with a size from 2.5 microns to 25 microns. Dust with a SiO2 content of up to 70%, which is released during unloading and transportation of raw materials (dolomite, basalt), enters the atmospheric air without purification. At the same time, particles with a size of up to 60 microns and up to 72 microns dominate in atmospheric air, respectively. The main characteristics of the dust necessary for the objective selection of dust-cleaning equipment are determined.

Особенности возникновения и предупреждение взрывоопасных режимов в системах аспирации с фильтрами-пылеуловителями

2020 ◽  
Author(s):  
Elena Romanyuk ◽  
Andrey Fedorov
Keyword(s):  
Control Method ◽  
Filter Material ◽  
Dust Collector ◽  
Geometric Form ◽  
Automated Control ◽  
Aspiration System ◽  
Fire Extinguishing ◽  
Experimental Stand ◽  
Filter Operation ◽  
Granular Filters

Обоснованы преимущества использования зернистых фильтров в системах аспирации производственных помещений, в которых образуется и обращается горючая пыль. Рассмотрены некоторые известные конструкции, имеющие достаточно узкое применение, однако перспективные для обработки взрывоопасных пылегазовых потоков. Дано описание лабораторного стенда и приведены результаты экспериментальных исследований процесса фильтрования зернистыми фильтрами, подтверждающие необходимость контроля взрывоопасных ситуаций в работе пылеуловителя. Предложен автоматизированный способ контроля аспирации для предупреждения взрывоопасных состояний фильтра.There is a large number of technological operations associated with the treatment of combustible dusts at production facilities. Such industries include food, pharmaceutical, woodworking, metalworking, textile and other industries, the main technological equipment of which is supplemented with aspiration systems. According to the requirements of ecology, labour protection and fire safety, this system must include a dust collector. When choosing a dust collector for such systems granular filters are found particularly effective. They allow to precipitate combustible dust. The article presents the known constructions of granular filters, the narrow application of which is associated with insufficient study of their operation with explosive flows. Therefore, the authors developed an experimental stand and analyzed the operation of different filters: with metal balls, screws, peas and pea mash, grain, which can be used as filter material. During the experiment it was found a state in which the filter operation is explosive. According to the results of the analysis, the criteria for the descriptions of normal and explosive operation are introduced - the criteria of geometric form, characterizes the filter and dust - K, and the rate of filtration - T. Numerical values of criteria are given for automated control of the filter operation. The automated control method of the filter allows to make the operation of the aspiration system more efficient and prevents explosive situations by timely regeneration and replacement of the layer, taking into account the calculated value of criteria K and T. In the scheme there are shown fire extinguishing modules, which are triggered by sensors when the temperature rises above normal.

Marine Epoxy Resin Chocks

1984 ◽  
Vol 21 (01) ◽  
pp. 12-18
Author(s):  
J. Murray Wilson
Keyword(s):  
United States ◽  
Cast Iron ◽  
Diesel Engine ◽  
Epoxy Resin ◽  
United States Navy ◽  
Standard Procedure ◽  
The United States ◽  
Service Experience ◽  
New Construction ◽  
Ship Repair

Epoxy resin chocks originally answered a ship repair need for a diesel engine rechocking method that eliminated foundation and bedplate machining. Service experience quickly showed that resin chocking was not only faster and cheaper, but also superior to steel or cast iron. Adoption for new construction came slowly, but today resin chocking is standard procedure for many shipyards. The same resins have numerous other uses, notably for sterntube and strut bearing installation. Increasing adoption by the United States Navy will probably give the final seal of respectability to these underutilized materials.

scholarly journals DETERMINATION OF THE MAIN PROPERTIES OF DUST PARTICLES IN THE GRINDING AREA

2020 ◽  
Vol 5 (10) ◽  
pp. 23-32
Author(s):  
I. Bur'yanov ◽  
K. Logachev ◽  
Valerij Uvarov
Keyword(s):  
Metal Cutting ◽  
Negative Impact ◽  
Dust Particles ◽  
Dust Collector ◽  
Dust Emissions ◽  
Aspiration System ◽  
Work Area ◽  
Production Company ◽  
Metal Tools

The abrasive processing of metal products is accompanied by harmful dust emissions into the work area. Exceeding the MPC of dust particles in the work area has a negative impact on the health of working personnel-it leads to occupational diseases of dust etiology. To localize harmful dust emissions when working on grinding machines, there are various dust collectors and their modifications, which allow to deal with harmful dust emissions with different efficiency. The design of the dust collector shrouds may involve connecting to an aspiration system that creates a low-pressure zone in the housing of the shroud, and thereby helps to remove harmful particles released during work. To correctly calculate the costs of air removed by local suction systems, it is necessary to analyze the dust situation and determine the properties of dust aerosols at a specific enterprise. In this work, the analysis of samples of dust particles selected at the grinding site of the plant for the manufacture of metal-cutting and metal tools, as well as technological equipment of LLC Production Company "Russian tool". Obtaining correct and up-to-date data on the size and chemical analysis of dust particles is necessary for the development of an energy-efficient aspiration system, as well as a mathematical model of the movement of dust particles.

Using Cast Iron for Steel Melting in an Electric Arc Furnace

2019 ◽  
Vol 49 (10) ◽  
pp. 695-697
Author(s):  
V. A. Bigeev ◽  
A. M. Stolyarov ◽  
M. V. Potapova
Keyword(s):  
Cast Iron ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Arc Furnace ◽  
Steel Melting

scholarly journals Resource-saving technologies for cleaning gas emissions in the production of building materials

2018 ◽  
Vol 196 ◽  
pp. 04070 ◽  
Author(s):  
Tatiana Skorik ◽  
Natalia Galkina ◽  
Elena Glazunovà
Keyword(s):  
Building Materials ◽  
High Efficiency ◽  
Construction Materials ◽  
Chemical Properties ◽  
Maximum Level ◽  
Ambient Air ◽  
Dust Collector ◽  
Resource Saving ◽  
Dust Collection ◽  
Gas Cleaning

High requirements to ensure sanitary and hygienic working conditions and reduce harmful emissions into the environment are provided through ventilation systems equipped with efficient and economical equipment. The task of improving the air basin is to reduce the amount of harmful substances in the ambient air to the level of MPC and lower, which, with increasing volumes of ventilation and process emissions, determines the increased requirements for industrial filters. The most effective are wet devices, in which the process of gas cleaning is carried out through interaction with the liquid, most often with water. The authors developed a number of high-efficiency dust-collecting apparatuses, in which the majority of methods for contacting elements with a liquid are realized simultaneously, which determines the maximum completeness of gas purification from dusts with different physico-chemical properties. One of them is an aerohydrocyclone intended for combined simultaneous cleaning of a technological product in the form of a suspension and dusty air removed from the shelters of technological equipment. This apparatus with internal circulation of liquid, where the concentration of trapped dust in the irrigating liquid affects the efficiency of dust collection, the frequency of water replacement, the operating mode and the load of the water-slurry farm. The particulate materials of the slurry intensifies the process of dispersion, irrigating liquid and its structural viscosity, as well as the stability of the formed foam, which contributes to a more effective manifestation of various wet dust collection mechanisms.The implementation of the installation of a wet dust collector for complex cleaning in the technological line for the preparation of lime milk from the construction materials factory made it possible to reduce the concentration of dust in emissions at the maximum level of ensuring the economy of aspiration systems. The obtained results testify to the positive experience of the operation of wet dust collectors for complex cleaning in the building materials industry, and the regularities connecting the operation modes of the apparatus with the properties of trapped dusts and the features of technological processes make it possible to recommend them for use in various enterprises.

scholarly journals ANALYSIS OF THE SANITARY PURIFICATION OF GAS EMISSIONS FROM DUST IN THE LIME MANUFACTURE

2017 ◽  
Vol 5 ◽  
pp. 65-72
Author(s):  
Inna Pitak ◽  
Serhii Briankin ◽  
Oleg Pitak ◽  
Valery Shaporev
Keyword(s):  
Cross Sections ◽  
Gas Flow ◽  
Structural Changes ◽  
Experimental Studies ◽  
Tangential Velocity ◽  
Dust Particles ◽  
Dust Collector ◽  
Purification Efficiency ◽  
Hydrodynamic Situation ◽  
Vortex Apparatus

Experimental studies have been carried out to study the effect of the location of the blade vortex from the end of the flue (the flow outflow from the flue to the separation chamber) by the value Vjmax and the determination of the optimum cross section where Vjmax is reached, and also the study of the influence of structural changes on the purification efficiency. The dependence of this swirler on the value of the tangential velocity of the gas flow at its exit from the separator is established. The cross-sections of the flue duct in which, after the swirler, the maximum values Vj, Vr are reached, the features of the dust-gas flow in the studied sections are considered. Based on the studies of the hydrodynamic situation during the flow of a rotating flow in the flue after the swirler, the possibilities of agglomeration of dust particles in the investigated zones, as well as the destruction of NOx gas impurities, are analyzed. During the operation of the reconstructed vortex dust collector, qualitative indices are attained, which confirm the expediency of the conducted studies and the expediency of reconstructing the vortex apparatus. It is proved that the installation of the blade vortex enhances the purification efficiency of the dust-gas flow in a vortex dust collector and will allow for a comprehensive purification of the exhaust gases.

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