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.

The Effectiveness Criterion for Densification of Wood Waste

2016 ◽  
Vol 832 ◽  
pp. 89-94
Author(s):  
Miloš Matúš ◽  
Peter Križan ◽  
Juraj Beniak
Keyword(s):  
Moisture Content ◽  
Energy Input ◽  
Minimum Energy ◽  
Size Fraction ◽  
Raw Material ◽  
Densification Process ◽  
Pine Sawdust ◽  
Biomass Densification ◽  
Solid Biofuel ◽  
Two Stages

Densification process of biomass to the form of high-grade solid biofuel (briquette or pellet) is influenced by amount of technological factors. Size fraction and moisture content of raw material have the most importance. The densification process may be describing by complicated mathematical models based on behaviour of pressed particular matter. Therefore it is complicated to energy optimize the process. This paper deals with a methodology for determining the compressibility for pine sawdust on the basis of experiments. It also specifies the effectiveness criterion for biomass densification in order to optimize the densification process in terms of energy input. The experiments were performed in two stages. The first stage was an experimental investigation of the influence of size fraction and moisture content on the final compressibility of pine sawdust. High-pressure binderless densification of pine processing residues in the form of sawdust was studied. A piston-and-die process was used to produce densified briquettes under 20 °C temperature and at pressure up to 159 MPa. The results show the behaviour of the pressure load when the parameters of the particulate matter are changed. In the second stage, the experiments were evaluated and optimized to achieve minimum energy input of the process and a maximum degree of densification. For this purpose the Effectiveness Criterion for Densification was designed

scholarly journals AGGLOMERATION OF ACACIA MANGIUM BIOMASS

2018 ◽  
Vol 56 (2) ◽  
pp. 198 ◽  
Author(s):  
Trinh Van Quyen ◽  
Nagy Sándor
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Constant Pressure ◽  
Acacia Mangium ◽  
Raw Material ◽  
Optimal Conditions ◽  
Densification Process ◽  
Lower Strength ◽  
Effects Of Temperature ◽  
Increasing Temperature

The aim of this study is to analyze the effects of temperature (T), moisture content (MC) and particle size (x) on Acacia mangium biomass and also to find the optimal conditions of the densification process for producing tablet with high density. The result shows that at constant pressure, increasing temperature (T) resulted in higher density of tablets and also increasing moisture content resulted in higher density of tables. Tablets made from raw material with smaller particle size have lower strength than those made from material with larger particle size.

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 Technical, Environmental, and Qualitative Assessment of the Oak Waste Processing and Its Usage for Energy Conversion

2020 ◽  
Vol 12 (19) ◽  
pp. 8113
Author(s):  
Algirdas Jasinskas ◽  
Ramūnas Mieldažys ◽  
Eglė Jotautienė ◽  
Rolandas Domeika ◽  
Edvardas Vaiciukevičius ◽  
...  
Keyword(s):  
Moisture Content ◽  
Calorific Value ◽  
Wood Waste ◽  
Qualitative Assessment ◽  
Herbaceous Plant ◽  
Waste Biomass ◽  
Solid Biofuels ◽  
Solid Biofuel ◽  
Harmful Emissions ◽  
Oak Leaves

The article analyses and evaluates the possibilities of using oak bark, oak leaves, and their mixtures for biofuel. The preparation of this waste for the burning process (milling, granulation) has been investigated and the results have been presented together with the analysis of the prepared granules’ properties—humidity, density, strength, elemental composition, ash content, caloric value, and others. The moisture content of the oak waste granules ranged from 8.1% to 12.5%, and the granules’ density ranged from 975.8 to 1122.2 kg m−3 DM (dry matter). The amount of oak ash found was very high (from 10.4% to 14.7%)—about 10 times higher than that of wood waste granules. The calorific value determined after burning the oak bark and leaves pellets was sufficiently high, ranging from 17.3 to 17.7 MJ kg−1. This thermal value of oak waste granules was close to the calorific value of the herbaceous plant species and some types of wood waste. The environmental impact of burning the granules of oak waste was also assessed. The harmful emissions of carbon monoxide and dioxide, nitrogen oxides, and unburnt hydrocarbons into the environment were found to be below the permissible limits for the incineration of oak waste granules. The highest CO gas concentration, determined when burning the oak leaves, was 1187.70 mg m−3, and the lowest NOx concentration, determined when burning the oak bark and leaf mixture granules, was 341.2 mg m−3. The coefficient of energy efficiency R of the granulated oak leaves biofuel, when the oak waste biomass moisture content was reduced by 10%, reached 3.64. It was very similar to the results of previous studies of various types of granulated straw biofuel (3.5–3.7). The research results presented show that, given that the main parameters of oak waste meet the basic requirements of solid biofuel, oak bark, leaves, and their mixture can be recommended to be used as solid biofuels.

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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