Determination of Specific Energy Consumption and Grain Size for Corn Grinding Using the Hammer Mill MB7,5

Drocaş, I.; Marian, Ovidiu; Ranta, Ovidiu; Molnar, Adrian; Muntean, Mircea

doi:10.15835/buasvmcn-agr:10888

Cited by 6 publications

(7 citation statements)

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“…The main parameters for the hammer mill working regime, in this research, are confirmed by a large part of the specialty literature [36][37][38][39][40][41][42][43].…”

Section: Considerations Regarding Hammer Mill Working Process Optimiz...supporting

confidence: 75%

Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

et al. 2021

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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.

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“…The main parameters for the hammer mill working regime, in this research, are confirmed by a large part of the specialty literature [36][37][38][39][40][41][42][43].…”

Section: Considerations Regarding Hammer Mill Working Process Optimiz...supporting

confidence: 75%

Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

et al. 2021

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“…This conclusion is in concordance, with no exception, with all specialty literature linked to hammer mills and other mills [1][2][3][4][5][6][7][8][9][10][11]. The same phenomenon takes place in the case of energy and flow of material introduced for grinding correlation, being also with no negative exception, meaning that, if there is a link between these parameters, it is close to reverse proportionality.…”

Section: Resultssupporting

confidence: 80%

“…In paper [5], the rise in consumed energy with lowering of the sieve orifice dimensions is outlined, but also the rise of energy consumption with material humidity, of course, for the interval of humidity levels taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Some statistical parameters for Miscanthus giganteus and Salix viminalis grinding using hammer mills

Voicu

Moiceanu

Cârdei

2018

Engineering for Rural Development

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Abstract. In the present paper we present values of some parameters of the grinding process experimentally determined for a hammer mill used for grinding miscanthus stems and willow harvested with specific harvesting machines. The grinding energy according to three tuning parameters was determined: hammer rotor frequency, feeding flow and mill sieve orifice diameter, for two types of hammers (one or twoedge corners). Value sets of energy-feeding flow, energy -rotor rotation frequency, energy -sieve orifice diameter, were analyzed, statistically determining the correlation between them, as well as other statistical parameters, using Excel MS Office (ex.covariance or kurtosis). If grinded biomass is willow, for the link between the energy and sieve orifice diameter the correlation shows a weak relation for one and two edge corner hammers, the two parameters being inversely proportional. Keeping in mind the fact that in the seven out of eight cases the correlation energy sieve orifice diameter presents an inversely proportional dependency, we can accept the hypothesis of reverse proportionality of the two parameters. In the paper, other comments are added regarding values obtained for all statistical parameters analyzed for the two types of grinded biomass.Keywords: biomass, grinding, energy consumption, frequency, feeding flow, statistical parameters. IntroductionBetween the constructive and functional parameters with a high influence on the hammer mill work rate, we can count: hammer rotor dimensions, dimension and shape of the hammer, dimension and form of the sieve orifices, rotor speed, feeding flow, etc.The authors [1] have studied the consumed specific energy variation in hammer mills according to the sieve orifice diameter and grinded vegetal material (alfalfa) mechanical properties. The first conclusion of the article is that specific energy consumption rises with lowering the sieve orifice diameter. Using only linear regression, the authors [1] obtain a regression coefficient with the values of 0.68-0.7. Using polynomial non-linear regressions, regression coefficients of over 0.7 were obtained, reaching over 0.9.The authors [2] confirm direct dependency of energy consumption on hammer mills with the rotation speed, which seems normal, the same thing being confirmed by the authors of the paper [3], which additionally shows reverse dependency of the same energy with the sieve orifice diameter.Reverse dependency of energy with the sieve orifice size is presented in [4], in which it is stated that the linear model of dependency of consumed energy on model parameters gave the best results. In paper [5], the rise in consumed energy with lowering of the sieve orifice dimensions is outlined, but also the rise of energy consumption with material humidity, of course, for the interval of humidity levels taken into consideration.The authors [6] confirm the same types of dependency, and the authors [7] confirm direct dependency of energy consumption on the work flow (which also means productivity in this case), but al...

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“…More, a wide range of food, including bread, noodles, cakes, cookies, muffins, pre-mix, drinks, vinegar, surimi and artificial meat can use rice flour as a primary ingredient. In this sense, it would be necessary to grind the rice grains with mills that do not damage the starch grains very much, an essential condition in its gelatinization, [2][3][4][5][6][7][8][9][10][11]. The milling equipment has a special importance on the functional properties of rice flour [2].…”

Section: Introductionmentioning

confidence: 99%

Aspects regarding particle size distribution and energy consumption when grinding husked rice seeds

Voicu

Constantin

Stefan

et al. 2020

Engineering for Rural Development

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The paper presents part of the results obtained in the experimental investigations regarding the energy consumption in the grinding process of husked rice seeds in grinding machines with a closed chamber of small capacity (knife mill), with the evacuation of the milled material at the end of the milling. The milling indices are analysed and some specifications are made regarding the particle size distribution obtained in the milling process, correlated with the energy consumption when size reduction. Thus, the correlation of the size of the grinded particles, of the grinding index, of the surface increase, of the temperature increase and the energy consumed when shredding with the sample time, as well as other correlations between the specified indices are presented. Several mathematical functions are specified and their regression is made with the experimental data obtained when grinding husked rice seeds. It has been found that the specific energy of grinding increases directly proportional to the time of grinding, but only in the first phase of the process it is consumed to achieve a specific surface growth, in the second phase the surface growth is relatively low. It can be appreciated that the increase of the grinding time above a certain limit produces more intense heating of the material subjected to the grinding and reduced grinding due to the more intense friction between the milled particles and the increase of the heat transfer time. The paper also makes further details regarding the rice grinding indices and graphically presents their variation, some in relation to others.

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Determination of Specific Energy Consumption and Grain Size for Corn Grinding Using the Hammer Mill MB7,5

Cited by 6 publications

References 0 publications

Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

Some statistical parameters for Miscanthus giganteus and Salix viminalis grinding using hammer mills

Aspects regarding particle size distribution and energy consumption when grinding husked rice seeds

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