scholarly journals Energy Consumption at Size Reduction of Lignocellulose Biomass for Bioenergy

2019 ◽  
Vol 11 (9) ◽  
pp. 2477 ◽  
Author(s):  
Georgiana Moiceanu ◽  
Gigel Paraschiv ◽  
Gheorghe Voicu ◽  
Mirela Dinca ◽  
Olivia Negoita ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Specific Energy Consumption ◽  
Reduction Process ◽  
Size Reduction ◽  
Hammer Mill ◽  
Biomass Processing ◽  
Different Types ◽  
Fracturing Experiments ◽  
Grinding System ◽  
Different Levels

In order to obtain bioenergy (biogas, biofuel) or pellets, different types of lignocellulosic biomass are subjected to a mechanical pretreatment, first by size reduction, then by separating, and ultimately by fracturing or bio-refining. Biomass processing mainly refers to a grinding process that occurs until reaching certain limits. The size reduction process, such as grinding, is an operation that is executed with different levels of energy consumption, considering biomass mechanical characteristics and the necessary grinding level. This paper, illustrates a comparative analysis of experimental results obtained by grinding multiple types of vegetal biomass (Miscanthus, corn stalks, alfalfa, willow) used in the process of bio-refining and bio-fracturing. Experiments were realized using both a laboratory knife mill Grindomix GM200 (Retsch GmbH, Haan, Germany), and a 22 kW articulated hammer mill, using different grinding system speeds and different hammer mill sieves. Results have shown that biomass mechanical pre-processing grinding leads to supplementary costs in the overall process through bio-refining or bio-fracturing in order to obtain bio-products or bio-energy. So, specific energy consumption for grinding using a hammer mill can reach 50–65 kJ/kg for harvested Miscanthus biomass, and 35–50 kJ/kg for dried energetic willow, using a 10 mm orifice sieve, values which increase processing costs.

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 Influence of grinding method and grinding intensity of corn on mill energy consumption and pellet quality

2016 ◽  
Vol 70 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Djuro Vukmirovic ◽  
Jovanka Levic ◽  
Aleksandar Fistes ◽  
Radmilo Colovic ◽  
Tea Brlek ◽  
...  
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Hammer Mill ◽  
Pellet Quality ◽  
Roller Mill ◽  
Grinding Method

In recent years there is an emerging trend of coarse grinding of cereals in production of poultry feed due to positive influence of coarse particles on poultry digestive system. Influence of grinding method (hammer mill vs. roller mill) and grinding intensity of corn (coarseness of grinding) on mill specific energy consumption and pellet quality was investigated. By decreasing grinding intensity of corn (coarser grinding), specific energy consumption of both hammer mill and roller mill was significantly decreased (p < 0.05). When comparing similar grinding intensities on hammer mill and roller mill (similar geometric mean diameter or similar particle size distribution), specific energy consumption was higher for the hammer mill. Pellet quality decreased with coarser grinding on hammer mill but, however, this effect was not observed for the roller mill. Generally, pellet quality was better when roller mill was used. It can be concluded that significant energy savings could be achieved by coarser grinding of corn before pelleting and by using roller mill instead of hammer mill. From the aspect of pellet quality, if coarser grinding is applied it is better to use roller mill, concerning that more uniform particle size distribution of corn ground on roller mill probably results in more uniform particle size distribution in pellets and this provides better pellet quality.

scholarly journals Reconstruction of Turbomachines on the Basis of the Flow Structure Visual Diagnostics

2020 ◽  
Vol 22 (2) ◽  
pp. 405-414
Author(s):  
Vasyl Arsiri ◽  
Oleg Kravchenko
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Flow Structure ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Dynamic Processes ◽  
Hydraulic Efficiency ◽  
Different Types ◽  
Increase In Productivity

AbstractThe indicator of the quality of modern turbomachines is only the coefficient of efficiency, which characterizes the ratio of the useful work of compressors or fans to the energy expended on the drive. For the analysis of the quality of the motion, processes in flow parts, the values of resistances are used which are difficult to be considered as an indicator of the efficiency of dynamic processes. The report presents the results of visual diagnostics of the structure of flows during the movement in the elements of turbomachines, as well as options for improving the geometry of the flow parts - in the inlet pipes, impellers.For the analysis of the efficiency of the motion of liquids and gases in flowing parts, a calculated index is proposed - the coefficient of hydraulic efficiency of dynamic processes. The joint use of two indicators - the efficiency of transformation of different types of energy (efficiency of turbomachines) and the efficiency of dynamic processes in flowing parts allows us to develop and to analyze the results of reconstruction of turbomachines. Reconstruction of turbomachines with the purpose of improving the geometry of the flow parts provides an increase in productivity of turbines, compressors, fans and pumps, while reducing the specific energy consumption for the processes of compression and transport of liquids and gases. Optimization of turbomachines flow parts based of flow structure visual diagnostics allows to reduce noise and vibration, as well as to solve other problems.

scholarly journals Study of the Relationships Between Multi-Hole, Multi-Disc Mill Performance Parameters and Comminution Indicators

2021 ◽  
Vol 13 (15) ◽  
pp. 8260
Author(s):  
Weronika Kruszelnicka ◽  
Jakub Hlosta ◽  
Jan Diviš ◽  
Łukasz Gierz
Keyword(s):  
Energy Consumption ◽  
Power Consumption ◽  
Monitoring System ◽  
Specific Energy ◽  
Research Program ◽  
Specific Energy Consumption ◽  
Angular Speed ◽  
Size Reduction ◽  
Reduction Ratio ◽  
Performance Parameters

The knowledge of a grinder structure, its performance parameters and characteristics of biomaterials breakage are crucial for this research whose aim is to determine the dependencies between performance parameters and comminution indicators. The aim of this study is to investigate the relationships between multi-disc mill performance parameters such as discs angular speed, batch dosing speed and comminution characteristics: power consumption, specific energy consumption, throughput and size reduction ratio. To achieve these goals, an experiment was conducted on a five-disc mill with a special monitoring system. The research program was established, with disc angular speed at different configurations and different batch dosing speeds. The results show that power consumption, specific energy consumption and size reduction ratio depend on the total increase in angular speed of discs SΔω in such a way that an increase in SΔω causes an increase in the abovementioned comminution indicators. In turn, an increase in batch dosing speed W causes an increase in throughput. The fitting curves of comminution indicators in dependence of selected performance parameters are also presented in this study.

scholarly journals PERFECTION OF THE PYROLYSIS PROCESS

2017 ◽  
pp. 113-117
Author(s):  
E. R. Magaril ◽  
R. Z. Magaril ◽  
L. V. Trushkova
Keyword(s):  
Energy Consumption ◽  
Raw Materials ◽  
Specific Energy Consumption ◽  
Relative Reactivity ◽  
Methyl Radicals ◽  
Pyrolysis Process ◽  
Hydrogen Atoms ◽  
Thermal Reactions ◽  
Different Types ◽  
Liquid Products

There were obtained the values of the relative reactivity of different types of bonds in interaction with hydrogen atoms, methyl radicals, as well as values of the effective relative reactivity when using an inert diluent, enabling to improve knowledge about the pyrolysis of raw materials of a given composition. A method was developed for increasing the selectivity of the pyrolysis for the desired products of the process (lower olefins), reducing the yield of liquid products of condensation and specific energy consumption, based on the influence of hydrogen on the thermal reactions of alkanes and alkenes.

Studies on Grinding and Extraction of Oil from Fenugreek (Trigonella foenum-graecum) Seed

2015 ◽  
Vol 11 (2) ◽  
pp. 275-283 ◽  
Author(s):  
Savitha HG ◽  
Manohar B
Keyword(s):  
Specific Energy Consumption ◽  
Size Reduction ◽  
Reduction Ratio ◽  
Oil Yield ◽  
Hammer Mill ◽  
Statistical Parameters ◽  
Uniformity Coefficient ◽  
Trigonella Foenum Graecum ◽  
Medicinal Properties ◽  
Powder Fraction

Abstract Fenugreek (Trigonella foenum-graecum) seed known for its many medicinal properties is studied for its grinding characteristics in an impact-type hammer mill. The particle size distribution (PSD) data of powder was found to regress very well with well-known mathematical Rosin–Rammler–Bennet model. Several statistical parameters of the PSD such as mass relative span, size guide number, skewness, uniformity index, uniformity coefficient were also estimated. Weight mean diameter for the entire range of grinding was between 395.8 and 620.8 µm. Specific energy consumption (32.4–115.2 kJ/kg) increased linearly with increase in size reduction ratio (4.53–7.10). Fenugreek powder fraction with less than 200 µm resulted in highest oil yield. Oil yield was found increasing with increase in size reduction ratio.

Sign in / Sign up

Export Citation Format

Share Document