INTERACTION OF PARTICLE SIZE, MOISTURE CONTENT AND COMPRESSION PRESSURE ON THE BULK DENSITY OF WOOD CHIP AND STRAW

2006 ◽  
Author(s):  
H Mozammel ◽  
S Shahab ◽  
B Tony ◽  
M Sudhagar ◽  
J Ladan ◽  
...  
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Bulk Density ◽  
Wood Chip ◽  
Compression Pressure

scholarly journals Variations in selected soil physical properties with landforms and slope within an inland valley ecosystem in Ashanti region of Ghana

2011 ◽  
Vol 6 (No. 2) ◽  
pp. 73-82 ◽  
Author(s):  
S.E. Obalum ◽  
J.C. Nwite ◽  
J. Oppong ◽  
C.A. Igwe ◽  
T. Wakatsuki
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Bulk Density ◽  
Site Selection ◽  
Total Porosity ◽  
Soil Physical Properties ◽  
Silt Fraction ◽  
Inland Valley

One peculiar feature of the inland valleys abundant in West Africa is their site-specific hydrology, underlain mainly by the prevailing landforms and topography. Development and management of these land resources under the increasingly popular sawah (a system of bunded, puddled and levelled rice field with facilities for irrigation and drainage) technology is a promising opportunity for enhancing rice (Oryza sativa L.) production in the region. Information on the variations in selected soil physical properties as influenced by the prevailing landforms may serve as a useful guide in site selection. This is of practical importance since majority of the inland valleys are potentially unsuitable for sawah development and most farmers in the region are of low technical level. Three landforms (river levee, elevated area and depressed area) were identified within a sawah field located in an inland valley at Ahafo Ano South District of Ghana. Each of these landforms was topsoil-sampled along on identified gradient (top, mid and bottom slope positions). Parameters determined included particle size distribution, bulk density, total porosity and field moisture content. The soil is predominantly clayey. There were no variations in the particle size distribution among the slope positions in the river levee. Overall, the river levee had lower silt content than the elevated and the depressed landforms. The bulk density, total porosity, and gravimetric moisture content indicated relative improvements only in the depressed area in the order, bottom &gt; mid &gt; top slope. Irrespective of slope position, the three landforms differed in these parameters in the order, depressed &gt; river levee &gt; elevated. The sand fraction impacted negatively on the silt fraction and bulk density of the soil, both of which controlled the soil moisture status. Despite the fairly low silt content of the soil, the silt fraction strongly influenced the gravimetric moisture content (R<sup>2</sup> = 0.80). So too did the soil bulk density on the gravimetric moisture content (R<sup>2</sup> = 0.90). It is concluded that: (1) since the landforms more prominently influenced the measured parameters than the slope positions, the former should take pre-eminence over the latter in soil suitability judgment; (2) with respect to moisture retention, variations in silt fraction and bulk density of this and other clayey inland-valley soils should be used as guide in site selection for sawah development.

scholarly journals Application of mathematical modelling when determining the parameters effect of biomass densification process on solid biofuels quality

2018 ◽  
Vol 168 ◽  
pp. 07005 ◽  
Author(s):  
Peter Križan ◽  
Michal Svátek ◽  
Miloš Matúš ◽  
Juraj Beniak
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Quality Indicators ◽  
Waste Biomass ◽  
Densification Process ◽  
Compression Pressure ◽  
Solid Biofuels ◽  
Biomass Densification ◽  
Experimental Process ◽  
Compression Temperature

The main aim of this paper is to present the design of experiment (DOE) and evaluation methodology for this experimental plan in order to determine the parameters effect of biomass densification process on final solid biofuels quality. One of the recovery possibilities for waste biomass raw materials is production of solid biofuels. Using a variety combination of influencing variables can be improve the final quality of solid biofuels. Raw biomass material variables influence, especially (type of raw material, particle size, moisture content, compression pressure and compression temperature) can be recognized during the production of solid biofuels. Their effect can be seen through the quality indicators; especially mentioned variables significantly influence the mechanical quality indicators of solid biofuels. In this experimental research authors would like to investigate properties and behaviour of wood raw waste biomass during densification. This contribution discusses the analysis and design of experimental process, its individual steps and their subsequent DOE leading to the development of a mathematical model that will describe this process. This paper also presents the research findings regarding the effect of influencing variables on final density of solid biofuels during densification. Aim of the experimental process is to determine the mutual interaction between solid biofuels density and influencing variables during densification. Effect of compression pressure, compression temperature, moisture content and particle size on solid biofuels density from wood sawdust was determined.

Electrical capacitance as a proxy measurement of miscanthus bulk density, and the influence of moisture content and particle size

2017 ◽  
Vol 134 ◽  
pp. 102-108 ◽  
Author(s):  
Yuesheng Tan ◽  
Zewei Miao ◽  
Momin M. Abdul ◽  
Tony E. Grift ◽  
K.C. Ting
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Bulk Density ◽  
Electrical Capacitance ◽  
Proxy Measurement

Analyzing bulk density and void fraction: B. Effect of moisture content and compression pressure

2021 ◽  
Vol 381 ◽  
pp. 285-297
Author(s):  
Haim Kalman ◽  
Dmitry Portnikov
Keyword(s):  
Moisture Content ◽  
Bulk Density ◽  
Void Fraction ◽  
Compression Pressure ◽  
Effect Of Moisture

Geo-spatial analysis for horizontal and vertical variability of bulk density, particle-size distribution and soil moisture content in Tripura, Northeastern India

2021 ◽  
Vol 14 (24) ◽  
Author(s):  
Sah Kausar Reza ◽  
Nirmal Kumar ◽  
Sundaram Ramachandran ◽  
Subrata Mukhopadhyay ◽  
Surendra Kumar Singh ◽  
...  
Keyword(s):  
Particle Size ◽  
Soil Moisture ◽  
Spatial Analysis ◽  
Moisture Content ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Size Distribution ◽  
Soil Moisture Content ◽  
Northeastern India ◽  
Vertical Variability

scholarly journals INFLUENCE OF MOISTURE CONTENT OF COAL CHARGE ON ITS BULK DENSITY

2021 ◽  
Vol 1 ◽  
pp. 10-19
Author(s):  
N.A. Desna ◽  
D.V. Miroshnichenko ◽  
I.V. Miroshnichenko ◽  
V.I. Meshchanin ◽  
V.V. Koval
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Sharp Decrease ◽  
Average Diameter ◽  
Coke Ovens ◽  
Coal Charge ◽  
Mathematical Relationships ◽  
E Mail

The necessity of determining the bulk density of the coal charge for calculating the operation of coke ovens is argued, since this indicator affects the physicochemical properties of coke and the productivity of coke ovens. The diagram of the apparatus is provided and the method for determining the bulk density of the coal charge is presented. Each value obtained is the average of five parallel determinations. There has been presented the study of the dependence of the bulk density on moisture content for two research coal blends of different grades, compiled with the participation of domestic and imported grades of coal. For charge No. 1, it was concluded that the bulk density of the coal charge significantly depends on its working moisture. The minimum bulk density (798 kg/m3 ) is achieved at a working moisture of about 7 %. With a decrease in the value of the working moisture to 4 % or its growth to 12 %, the value of the bulk density of the coal charge increases to 820 and 871 kg/m3 , respectively. The minimum value of the bulk density of charge No. 2 (779 kg/m3 ) is noted at a working moisture of 7-8%. With a decrease in the value of the working moisture to 4.5 % or its increase to 12 %, the value of the bulk density of the coal charge increases to 845 and 892 kg/m3 , respectively. Based on the generalization of the results obtained, mathematical and graphic dependencies have been developed. They describe the effect of an increase in the moisture content of coal charges on the content of a class less than 0.5 mm in them, as well as the values of the average diameter of coal grains and bulk density. It was found that coal charges are characterized by a minimum bulk density at a moisture content of 7.2 %. With an increase in the moisture content of coal charges to 12 %, there is a sharp decrease in the content of the class less than 0.5 mm. This is due to the pelletization of small coal grains, which is reflected in an increase in their average diameter. Keywords: coal charge, bulk density, moisture content, particle size distribution, mathematical relationships. Corresponding author N.A. Desna, e-mail: [email protected]

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.  

Moisture Content and Bulk Density Measurements Using a Dual-Energy Beam of Gamma Radiation

1980 ◽  
Vol 44 (3) ◽  
pp. 662-663 ◽  
Author(s):  
B. S. C. Wood ◽  
N. Collis-George
Keyword(s):  
Moisture Content ◽  
Gamma Radiation ◽  
Bulk Density ◽  
Dual Energy ◽  
Density Measurements ◽  
Energy Beam

scholarly journals Wood Chip Drying through the Using of a Mobile Rotary Dryer

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1590 ◽  
Author(s):  
Angelo Del Giudice ◽  
Andrea Acampora ◽  
Enrico Santangelo ◽  
Luigi Pari ◽  
Simone Bergonzoli ◽  
...  
Keyword(s):  
Moisture Content ◽  
Power Plants ◽  
Black Locust ◽  
Thermal Power ◽  
Initial Moisture Content ◽  
Wood Chip ◽  
Wood Chips ◽  
Cocurrent Flow ◽  
Drying Process ◽  
Rotary Dryer

Drying is a critical point for the exploitation of biomass for energy production. High moisture content negatively affects the efficiency of power generation in combustion and gasification systems. Different types of dryers are available however; it is known that rotary dryers have low cost of maintenance and consume 15% and 30% less in terms of specific energy. The study analyzed the drying process of woody residues using a new prototype of mobile rotary dryer cocurrent flow. Woodchip of poplar (Populus spp.), black locust (Robinia pseudoacacia L.), and grapevine (Vitis vinifera L.) pruning were dried in a rotary drier. The drying cycle lasted 8 h for poplar, 6 h for black locust, and 6 h for pruning of grapevine. The initial biomass had a moisture content of around 50% for the poplar and around 30% for grapevine and black locust. The study showed that some characteristics of the biomass (e.g., initial moisture content, particle size distribution, bulk density) influence the technical parameters (i.e., airflow temperature, rate, and speed) of the drying process and, hence, the energy demand. At the end of the drying process, 17% of water was removed for poplar wood chips and 31% for grapevine and black locust wood chips. To achieve this, result the three-biomass required 1.61 (poplar), 0.86 (grapevine), and 1.12 MJ kgdry solids−1 (black locust), with an efficiency of thermal drying (η) respectively of 37%, 12%, and 27%. In the future, the results obtained suggest an increase in the efficiency of the thermal insulation of the mobile dryer, and the application of the mobile dryer in a small farm, for the recovery of exhaust gases from thermal power plants.

scholarly journals Comparative Study of the Properties of Wood Flour and Wood Pellets Manufactured from Secondary Processing Mill Residues

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2487
Author(s):  
Geeta Pokhrel ◽  
Yousoo Han ◽  
Douglas J. Gardner
Keyword(s):  
Moisture Content ◽  
Bulk Density ◽  
Raw Materials ◽  
Wood Flour ◽  
The United States ◽  
Red Maple ◽  
Wood Pellets ◽  
Secondary Processing ◽  
Material Costs ◽  
Mill Residues

The generation of secondary processing mill residues from wood processing facilities is extensive in the United States. Wood flour can be manufactured utilizing these residues and an important application of wood flour is as a filler in the wood–plastic composites (WPCs). Scientific research on wood flour production from mill residues is limited. One of the greatest costs involved in the supply chain of WPCs manufacturing is the transportation cost. Wood flour, constrained by low bulk densities, is commonly transported by truck trailers without attaining allowable weight limits. Because of this, shipping costs often exceed the material costs, consequently increasing raw material costs for WPC manufacturers and the price of finished products. A bulk density study of wood flour (190–220 kg/m3) and wood pellets (700–750 kg/m3) shows that a tractor-trailer can carry more than three times the weight of pellets compared to flour. Thus, this study focuses on exploring the utilization of mill residues from four wood species in Maine to produce raw materials for manufacturing WPCs. Two types of raw materials for the manufacture of WPCs, i.e., wood flour and wood pellets, were produced and a study of their properties was performed. At the species level, red maple 40-mesh wood flour had the highest bulk density and lowest moisture content. Spruce-fir wood flour particles were the finest (dgw of 0.18 mm). For all species, the 18–40 wood flour mesh size possessed the highest aspect ratio. Similarly, on average, wood pellets manufactured from 40-mesh particles had a lower moisture content, higher bulk density, and better durability than the pellets from unsieved wood flour. Red maple pellets had the lowest moisture content (0.12%) and the highest bulk density (738 kg/m3). The results concluded that the processing of residues into wood flour and then into pellets reduced the moisture content by 76.8% and increased the bulk density by 747%. These material property parameters are an important attempt to provide information that can facilitate the more cost-efficient transport of wood residue feedstocks over longer distances.

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