scholarly journals DEVELOPMENT AND STUDY OF THE GRAIN CRUSHING WORKING PROCESS OF SHOCKING AND REFLECTIVE CRUSHER

2019 ◽  
Vol 14 (1) ◽  
pp. 100-106
Author(s):  
Константин Миронов ◽  
Konstantin Mironov ◽  
Николай Оболенский ◽  
Nikolay Obolenskiy ◽  
Вера Гоева ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Specific Energy Consumption ◽  
Angle Of Attack ◽  
Optimization Criterion ◽  
Response Surfaces ◽  
Measurement Unit ◽  
Working Process ◽  
Grain Crushing ◽  
Joint Influence ◽  
Optimal Values

Based on the analysis of existing studies of the process of grinding grain, the goal and objectives of the research were set, a crusher of a grain of impact-reflective action was developed. The results of theoretical studies of the working process of the grain crusher, including the study of grains’ movement along the beam and the determination of the trajectory of movement of particles in the grinding chamber, are given As a result of the study of various methods of supplying the material, the lowest energy consumption was obtained when the comminuted material was fed through the upper loading window. In order to determine the joint influence of the factors under study on the criterion of optimization and the exclusion of insignificant, the semi-replica of the full factorial experiment was implemented. Variable factors were the rotor speed, the angle of attack, the material feed, the diameter of the holes, and the angle of coverage of the end sieve. The optimization criterion was specific energy consumption. At the next stage, grain refinement was investigated using a peripheral sieve instead of an end sieve, as well as a peripheral sieve and an end sieve at the same time. It was found that with an increase in the angle of attack hit the percentage of the yield of the finished product through a peripheral sieve increases. Also, to compare theoretical and practical studies, paint was applied to the surface, and then the nature of paint wear was examined. From a photograph taken after grinding the grain, one can see that in the area characterized by a positive value of b, the paint has worn off (which indicates a sliding movement of the weevil), and in the area with a negative value of b, we can see blows of the weevils. That is, the presented theoretical dependences quite accurately describe the nature of the movement of the weevil in the grinding chamber of the crusher. In order to determine the optimal values of the studied factors, a second-order experiment plan was implemented. The method of superimposing two-dimensional sections of the response surfaces yielded optimal values of the factors under study. At the same time, energy consumption amounted to 1 ... 1.3 (kW ∙ h) / (t - measurement unit), and the amount of dust and whole grains does not exceed the norms stipulated by GOST.

scholarly journals Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

2021 ◽  
Vol 13 (2) ◽  
pp. 973
Author(s):  
Gigel Paraschiv ◽  
Georgiana Moiceanu ◽  
Gheorghe Voicu ◽  
Mihai Chitoiu ◽  
Petru Cardei ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Optimization Problem ◽  
Specific Energy Consumption ◽  
Statistical Modelling ◽  
Hammer Mill ◽  
Objective Functions ◽  
Working Process ◽  
Rotor Spinning ◽  
Milled Material ◽  
Different Types

Our paper presents the hammer mill working process optimization problem destined for milling energetic biomass (MiscanthusGiganteus and Salix Viminalis). For the study, functional and constructive parameters of the hammer mill were taken into consideration in order to reduce the specific energy consumption. The energy consumption dependency on the mill rotor spinning frequency and on the sieve orifices in use, as well as on the material feeding flow, in correlation with the vegetal biomass milling degree was the focus of the analysis. For obtaining this the hammer mill was successively equipped with 4 different types of hammers that grind the energetic biomass, which had a certain humidity content and an initial degree of reduction ratio of the material. In order to start the optimization process of hammer mill working process, 12 parameters were defined. The objective functions which minimize hammer mill energy consumption and maximize the milled material percentage with a certain specific granulation were established. The results obtained can serve as the basis for choosing the optimal working, constructive, and functional parameters of hammer mills in this field, and for a better design of future hammer mills.

scholarly journals Research of a machine with a belt conveyor for drying grain

2020 ◽  
Vol 193 ◽  
pp. 01071
Author(s):  
Andrey Pavlushin ◽  
Sergey Sutyagin ◽  
Galina Karpenko ◽  
Vadim Artemiev
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Objective Assessment ◽  
Specific Energy Consumption ◽  
Experimental Studies ◽  
Conveyor Belt ◽  
Optimization Criterion ◽  
Regression Equation ◽  
Belt Conveyor ◽  
Grain Moisture

Currently, grain drying technology is imperfect. Therefore, the development and scientific substantiation of energy-saving, environmentally friendly installations for drying grain that meet the requirements of modern Russian agrarian production is an urgent and important scientific and technical task that is essential for the development of the country. To solve this problem, we have developed a contact-type installation with a belt conveyor. For an objective assessment of the research object, the specific energy consumption per 1 kg of evaporated moisture qуд, kJ/kg of moisture was taken as an optimization criterion. The study of the installation in the drying mode was carried out on oat grain. After processing the results of the experiments, a new equation was obtained. This is a regression equation in natural and coded values of independent factors. The regression equation characterizes the influence of independent factors on the optimization criterion. Having solved the regression equation, it was found that the minimum specific energy consumption for drying grain is 4388 kJ/kg of moisture. This value is achieved at an average temperature of the conveyor belt tᴤр = 60 °C and the residence time of grain in the installation τ>об = 40 s. In this case, the convergence of theoretical and experimentally obtained research results was at least 95%. The decrease in grain moisture during the heating cycle in the developed installation is 2 ... 2.5%, which corresponds to agrotechnical requirements. Thus, as a result of theoretical and experimental studies of the developed installation, it was revealed that with optimal values of independent factors, the specific energy consumption is 4388 kJ/kg of moisture, which is 1.5 times less compared to serial grain dryers, in particular, with the SZ - 1.

Studies on Rock-Breaking of Positive Disc Cutter and Edge Disc Cutter

2014 ◽  
Vol 508 ◽  
pp. 159-164 ◽  
Author(s):  
Kai Yang ◽  
Yi Min Xia ◽  
Yuan Wu
Keyword(s):  
Energy Consumption ◽  
Simulation Model ◽  
Specific Energy ◽  
Inflection Point ◽  
Rock Strength ◽  
Specific Energy Consumption ◽  
Rock Breaking ◽  
Disc Cutter ◽  
Installation Angle ◽  
Optimal Values

Based on TBM disc cutter layout, a rock-breaking model of positive disc cutter and edge disc cutter is built. Sequential rock-breaking of the two cutters under different parameters is simulated; rock fragmentation, three-axis force and energy consumption are studied; optimal rock-breaking condition with different parameters is determined; feasibility of the simulation model is finally verified by experiment. The results show that three-axis force of positive disc cutter and edge disc cutter both increase with the increase of rock strength. Also, the increase of installation angle leads to larger three-axis force of edge disc cutter. Compared with positive disc cutter, edge disc cutter suffers larger squeezing strength from rocks, which results in larger three-axis force in edge disc cutter. Specific energy consumption variation has an inflection point. To meet optimal rock-breaking condition, the optimal values of installation angle in breaking siltstone, granite and marble are respectively 6°, 7° and 7°.

scholarly journals The efficiency analysis of the SH-25A ball drum mill when grinding industrial products of fossil fuels

2020 ◽  
Vol 180 ◽  
pp. 01003
Author(s):  
Saule Kamarova ◽  
Saule Abildinova ◽  
Angel Terziev ◽  
Aliya Elemanova
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
High Speed ◽  
Fossil Fuels ◽  
Coal Dust ◽  
Specific Energy Consumption ◽  
Operational Characteristics ◽  
Optimal Values ◽  
Speed Mode ◽  
Karaganda Coal

The working characteristics of a laboratory ball drum mill during grinding of Karaganda coal products were studied in order to apply the results obtained to industrial installations. The performed analysis shows that the most complicated and energy-intensive stage of preparation of coal dust is the grinding of fuel. The operational characteristics of the mill productivity, consumed electric power and specific energy consumption in terms of the relative rotational speed of the drum as well as the optimal values of the relative velocity determining the qualitative grinding of the fuel have been determined. The performance of the processed drum mill reaches its maximum at a relative speed of rotation of the drum 0.71 ensuring a waterfall mode of grinding of fuel related to the high-speed mode of a coal-grinding mill. The estimated specific energy consumption for fuel grinding varies in the range from 0.11 kWh/kg up to 0.23 kWh/kg at fuel milling coefficient of Kl = 1.2.

scholarly journals Parametric Optimization of Belt Conveyors by Energy Efficiency Criterion

2021 ◽  
pp. 50-58
Author(s):  
O. S Kuropiatnyk
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Belt Speed ◽  
Optimal Value ◽  
Optimal Values ◽  
Belt Conveyors ◽  
Belt Width

Purpose. The purpose of this work is to substantiate the optimal values of the belt conveyor parameters, at which the specific energy consumption for the cargo transportation takes on the lowest value. Methodology. The substantiation of the optimal values of the belt conveyor parameters was carried out by minimizing the function of specific energy consumption, which represents the energy consumption for the transportation of a cargo weighing 1 kg at a distance of 1 m. In the course of research, the drive force was determined using the contour bypass meth-od. In this case, the specific loads from the transported cargo, belt and roller supports were presented as functions of the belt width. To establish the optimal values of the conveyor productivity and belt speed, the belt width was presented as a function of these values, taking into account the physical and mechanical properties of the transported cargo, the design features of the roller supports and the belt angle. Findings. I obtained the dependences of specific energy consumption on the design parameters of the conveyor. Their analysis made it possible to identify the opti-mal values of the belt width, conveyor productivity, belt speed, and the optimal ratio of the last two values for dif-ferent types of transported cargo. It is noted that the results obtained can be supplemented by carrying out calcula-tions according to the formula given in this work. It has been established that the optimal value of the belt width depends only on the belt angle and on the coefficients that determine the energy losses, in particular the movement resistance coefficient of the belt; the influence of the specified coefficient increases with an increase in the belt angle. In addition, the optimal value of the belt width does not depend on the conveyor length, its productivity and belt speed. Originality. The dependences of the specific energy consumption on the design parameters of the belt conveyor were obtained, which made it possible to establish the optimal values of the belt width and the ratio of the conveyor productivity to the belt speed. Practical value. The results of this work can be used in the design of energy-efficient belt conveyors, which are characterized by the lowest specific energy consumption for cargo transportation.

Evaluation of the specific energy consumption of a working process using an excavating machine with an active shovel

1991 ◽  
Vol 27 (4) ◽  
pp. 324-329
Author(s):  
A. K. Mattis ◽  
S. V. Shishaev ◽  
G. D. Zaitsev ◽  
A. V. Tolmachev
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Working Process

Determination of grinding parameters of fenugreek seed

1970 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
S Balasubramanian ◽  
Rajkumar Rajkumar ◽  
K K Singh
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Moisture Content ◽  
Specific Energy ◽  
Feed Rate ◽  
Average Particle Size ◽  
Specific Energy Consumption ◽  
Average Particle ◽  
Fenugreek Seeds ◽  
Fenugreek Seed

Experiment to identify ambient grinding conditions and energy consumed was conducted for fenugreek. Fenugreek seeds at three moisture content (5.1%, 11.5% and 17.3%, d.b.) were ground using a micro pulverizer hammer mill with different grinding screen openings (0.5, 1.0 and 1.5 mm) and feed rate (8, 16 and 24 kg h-1) at 3000 rpm. Physical properties of fenugreek seeds were also determined. Specific energy consumptions were found to decrease from 204.67 to 23.09 kJ kg-1 for increasing levels of feed rate and grinder screen openings. On the other hand specific energy consumption increased with increasing moisture content. The highest specific energy consumption was recorded for 17.3% moisture content and 8 kg h-1 feed rate with 0.5 mm screen opening. Average particle size decreased from 1.06 to 0.39 mm with increase of moisture content and grinder screen opening. It has been observed that the average particle size was minimum at 0.5 mm screen opening and 8 kg h-1 feed rate at lower moisture content. Bond’s work index and Kick’s constant were found to increase from 8.97 to 950.92 kWh kg-1 and 0.932 to 78.851 kWh kg-1 with the increase of moisture content, feed rate and grinder screen opening, respectively. Size reduction ratio and grinding effectiveness of fenugreek seed were found to decrease from 4.11 to 1.61 and 0.0118 to 0.0018 with the increase of moisture content, feed rate and grinder screen opening, respectively. The loose and compact bulk densities varied from 219.2 to 719.4 kg m-3 and 137.3 to 736.2 kg m-3, respectively.  

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