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Tytuł:
Generation of large scale robotic 3D printing trajectories and optimization of the quality of pieces
Autorzy:
Rosoux, François
Appeldoorn, Henri
Garray, Didier
Beeckman, Eric
Powiązania:
https://bibliotekanauki.pl/articles/29520055.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
3D printing
non-planar
robotics
polymers
pellet extrusion
Opis:
Incremental sheet forming is used to form metal sheets on massive dies. However, the waste and time lost due to the machining of dies can be a problem for both companies and the environment. Additive manufacturing is thus a potential alternative to classical machining of dies, but these complex geometries could be challenging for classical layer-by-layer 3D printing techniques. This paper will present an innovative process based on a 3D printing technology using 3-axis systems and a pellet extruder combined with the generation of non-planar trajectories in order to achieve good surface quality. PLA-based parts were realised to evaluate surface quality and mechanical properties. With such a technique, the obtained 3D printed parts were closer to the expected CAD geometries and smoother top surfaces were obtained. These improvements have been made possible through the development of specific post-processors and printing strategies in order to replicate the behaviour of a 3D printer at a larger scale, which is a current challenge in robotic 3D printing.
Źródło:
Computer Methods in Materials Science; 2023, 23, 1; 35-41
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the effectiveness of organic binders as an alternative to bentonite in the pelletization of low grade iron ore
Autorzy:
Tafadzwa, Ngara
Mavengere, Shielah
Bright, Sharrydon
Mapamba, Liberty
Powiązania:
https://bibliotekanauki.pl/articles/27323655.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bentonite
iron ore
low grade ore
organic binder
pelletization
pellet evaluation
refractory ore
Opis:
Bentonite is the traditionally used binder in iron ore pelletization. However, it consists of up to 85% silica and alumina which are undesired acidic gangue in iron-making. In this study, carboxymethyl cellulose, sodium lignosulfonate and cornstarch were used as acidic gangue-free organic alternatives to bentonite in synthesizing iron pellets. Iron ore, water and the corresponding binder were mixed and rolled in a pelletizing disk to form green pellets. The green pellets were dried and subsequently indurated in a furnace at 1200 ℃ to form indurated pellets. To evaluate the effectiveness of the organic binders, the pellets produced were tested on various pellet properties. Known industrial pellet property standards and the bentonite binder were used as references. Carboxymethyl cellulose, sodium lignosulfonate and corn starch produced green pellets with average drop numbers of 7.20 ± 0.84, 5.60 ± 0.89 and 6.00 ± 1.00 respectively, compared to bentonite’s 5.00 ± 0.71. Dry pellets of average compressive strength 5.93 ± 0.09, 5.86 ± 0.03 and 11.52 ± 0.18 kg/pellet were produced by carboxymethyl cellulose, sodium lignosulfonate and corn starch respectively while bentonite’s averaged 5.60 ± 0.08 kg/pellet. For indurated pellets, carboxymethyl cellulose (210.2 ± 1.88 kg/pellet) and sodium lignosulfonate (198.1 ± 2.49 kg/pellet) pellets were weaker than those of bentonite (250.4 ± 2.06 kg/pellet) but satisfied the industrial requirement of 181.4 kg/pellet. A boron oxide additive (0.1 wt. %) was used to boost the strength of carboxymethyl cellulose indurated pellets to 252.6 ± 1.32 kg/pellet, rendering them superior to those of bentonite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176094
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizing Merbau Wood and Coconut Shell Wastes as Biofuel in the Form of Pellets
Autorzy:
Prasetyadi, Gianova Vierry
Sutapa, Johanes Pramana Gentur
Powiązania:
https://bibliotekanauki.pl/articles/2202331.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
pellet
merbau
coconut shell
material combination
Opis:
The wood waste generated by wood industries is increasing. On the other hand, the demand for bioenergy in the form of pellets is also rapidly increasing. Converting wood waste into wood pellets can be one of the alternatives of waste management. At the same time, improving pellets quality can be implemented to keep up with the increasing pellets demand. This study investigated the characteristics of merbau (Intsia bijuga) wood and coconut (Cocos nucifera) shell wastes pellets, and effects of material combination pellets characteristics. The results showed that merbau wood and coconut shell wastes pellets proved to meet the DIN EN 15270 pellet quality standard. Moreover, a significant improvement on merbau pellets proximate properties and calorific value was investigated; however, the crush strength of pellets was significantly decreased.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 172--178
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Expansion of ZrO2-20 mol% Gd2O3
Autorzy:
Kang, Kweonho
Hong, Seok-Min
Lee, Changhwa
Cho, Yongjun
Powiązania:
https://bibliotekanauki.pl/articles/2125531.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ZrO2-20 mol% Gd2O3 pellet
thermal expansion
thermal expansion coefficient
density
thermo-mechanical analyzer
Opis:
The thermal expansion of a ZrO2-20 mol% Gd2O3 pellet has been systematically investigated using a thermo-mechanical analyzer in the temperature range of 293-1773 K. Variations in the thermal expansion coefficient and density upon temperature change were calculated using the thermal expansion data. The average linear thermal expansion coefficient of theZrO2-20 mol% Gd2O3 pellet was found to be 9.522 × 10-6 K-1 in the range of 298-1073 K. This value is smaller than that of ZrO2 and larger than that of Gd2O3. Further, with an increase in temperature to 1773 K, the density of ZrO2-20 mol% Gd2O3 pellet was found to decrease to 94.98 % of the initial density at 293 K.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 909--912
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Kinetics of the Drying Process of Composite Pellets on a Convective Drying Stand
Autorzy:
Petrova, Zhanna
Sniezhkin, Yurii
Paziuk, Vadym
Novikova, Yuliia
Petrov, Anton
Powiązania:
https://bibliotekanauki.pl/articles/1838289.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
obsolete sludge
peat
biomass
granulation
drying
pellet
Opis:
In Ukraine, the problem of processing and utilization of sludge deposits that are formed during the treatment process at wastewater treatment plants is relevant. Unprocessed sewage sludge merges into overcrowded sludge sites every year, which leads to a deterioration of the environment and living conditions in Ukraine. Therefore, the aim of the work was to study the processing of sludge, the creation of pellets based on their composition with peat and biomass and their drying. The article presents the studies of drying kinetics of composite pellets based on peat, obsolete sludge and biomass on an experimental convective drying stand. The influence of the proportions of the components of the composition on the drying time was determined and the ratio at which the drying time of the pellets is shorter and the pellets are of better quality was selected. A comparison of the drying time of the sludgepeat composition and its components was performed, which shows that during the drying of the composite pellets, the intensification of the drying process is observed. The study related to the effect of the diameter of the pellets on the duration of drying showed that the duration of drying increases along with diameter. The presented comparison of drying kinetics of twoand three-component pellets shows the same nature of the drying curves and the drying time is in the range of 17-18 minutes. The optimal ratio of components for quality granulation was selected. The effective drying regimes of composite pellets based on silt deposits, peat and biomass were determined.
Źródło:
Journal of Ecological Engineering; 2021, 22, 6; 159-166
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Kinetics of the Drying Process of Composite Pellets on a Convective Drying Stand
Autorzy:
Petrova, Zhanna
Sniezhkin, Yurii
Paziuk, Vadym
Novikova, Yuliia
Petrov, Anton
Powiązania:
https://bibliotekanauki.pl/articles/1838371.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
obsolete sludge
peat
biomass
granulation
drying
pellet
Opis:
In Ukraine, the problem of processing and utilization of sludge deposits that are formed during the treatment process at wastewater treatment plants is relevant. Unprocessed sewage sludge merges into overcrowded sludge sites every year, which leads to a deterioration of the environment and living conditions in Ukraine. Therefore, the aim of the work was to study the processing of sludge, the creation of pellets based on their composition with peat and biomass and their drying. The article presents the studies of drying kinetics of composite pellets based on peat, obsolete sludge and biomass on an experimental convective drying stand. The influence of the proportions of the components of the composition on the drying time was determined and the ratio at which the drying time of the pellets is shorter and the pellets are of better quality was selected. A comparison of the drying time of the sludgepeat composition and its components was performed, which shows that during the drying of the composite pellets, the intensification of the drying process is observed. The study related to the effect of the diameter of the pellets on the duration of drying showed that the duration of drying increases along with diameter. The presented comparison of drying kinetics of twoand three-component pellets shows the same nature of the drying curves and the drying time is in the range of 17-18 minutes. The optimal ratio of components for quality granulation was selected. The effective drying regimes of composite pellets based on silt deposits, peat and biomass were determined.
Źródło:
Journal of Ecological Engineering; 2021, 22, 6; 159-166
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of pellets from agricultural biogas plants in fertilisation of oxytrees in Podlasie, Poland
Autorzy:
Skibko, Zbigniew
Romaniuk, Wacław
Borusiewicz, Andrzej
Porwisiak, Henryk
Lisowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2048505.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
biomass
fertilisation
oxytree
Paulownia Clon in Vitro 112
pellet
Opis:
Agricultural biogas plants are not only a place for processing waste resulting from animal husbandry, but also for generating electricity and heat as well as organic fertiliser. In a four-year experiment, pellets were used as organic fertiliser in the establishment of an experiment with fast-growing oxytrees. The study aimed to investigate the growth and stem thickness increment, overwintering in the first and subsequent years of cultivation under the conditions of north-eastern Poland. The dried digestate and the pellets made from it were characterised by a high content of macroelements (N – 1,95%, P2O5 – 1,1%, K2O – 1,3%). The applied pellet from an agricultural biogas plant under oxytree seedlings due to its slow decomposition had a good effect on the growth of oxytrees in the second and third years. The average growth of oxytrees in the second year was 209.7 cm, and in the third year, 246.8 cm. The growth of oxytrees fertilised with pellets made from the digestate of an agricultural biogas plant was 13% higher than that of trees growing on the control strip.
Źródło:
Journal of Water and Land Development; 2021, 51; 124-128
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Występowanie łosi Alces alces L. na terenie Lasów Rogowskich (środkowa Polska)
Occurrence of moose Alces alces L. in the Rogów Forest (central Poland)
Autorzy:
Gryz, Jakub
Krauze-Gryz, Dagny
Powiązania:
https://bibliotekanauki.pl/articles/17888458.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
dane historyczne
mozaika polno-leśna
rekolonizacja
metody inwentaryzacji
liczenie grup odchodów
tropienia zimowe
pędzenia próbne
field and forest mosaic
recolonisation
historical data
pellet group counting
snow tracking
driving census
Opis:
Environmental changes affect edge populations first and the strongest. The aim of this study was to document the historical and current occurrence of the moose Alces alces L. along the western edge of its range in Poland and Europe. Our studies were conducted in central Poland, in the area of Experimental Forest Station of Warsaw University of Life Sciences (WULS) in the vicinity of Rogów village (225 km2 of field and forest mosaic, forest cover approx. 20%). We reviewed all available historical data as well as recorded direct observations. This included data collected through various methods such as drive counts, night spot-light and thermal vision counts along transect routes, snow tracking, camera-traps and pellet group counts. Occurrence of moose and changes in its abundance in the area of the Experimental Forest Station in Rogów reflected trends in the abundance of the species and in its range throughout the whole country. Currently, direct observations of moose or signs of its presence are recorded in the whole study area. However, in this very fragmented landscape, the species does not form a stable population but the observed individuals are most likely migrating from their main refugees. Signs of presence were recorded only once during drive counts and snow tracking in the central part of the study area (2011–2018) registered 0.03 moose tracks/ km/24 h. Snow tracking conducted in January and February of 2021 was focused on moose specifically and revealed the presence of 10–11 individuals in the entire study area. Pellet group counts along transects (spring 2020 and 2021) resulted in a density index of 0.33 pellet groups/km/100 days of accumulation, while data from camera-traps (2011–2020) indicated an increase in the relative abundance index. In the biggest forest complex of the study area, this index increased three fold, whereas in smaller forest complexes only two fold. Assuming that 11 individuals were present, the population density was 0.49 ind./1000 ha in terms of total area and 2.6 ind./1000 ha in terms of forest area. In the following years, a further population increase can be expected reflecting growth in the core population.
Źródło:
Leśne Prace Badawcze; 2021, 82, 4; 179-186
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adverse health outcomes among workers of wood pellet production facilities
Autorzy:
Górny, R.L.
Gołofit-Szymczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2085355.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
pellet
wood dust
bioaerosol
health questionnaire
occupational exposure
individual traits
environmental factors
logistic regression
Opis:
Introduction. Workers of pellet production facilities (WPPF) are exposed to high concentrations of wood dust and microbial pollutants. Such stimulation may lead to numerous allergic and toxic reactions, infections, and other non-specific syndromes. Objective. To check the influence of individual traits of workers and characteristic features / factors of their living and working environments on the probability of adverse outcomes’ appearance. Materials and Method. The questionnaire study assessing adverse health effects resulting from individual exposure was conducted among 28 workers of 10 Polish WPPF. The logistic regression (for dichotomous variables) was used to determine the appearance probability (given as odds ratio) of adverse symptoms or diseases. Results and Conclusions. WPPF workers may have an increased risk of developing work-related adverse health outcomes. Both the individual traits and environmental exposure factors significantly influence the probability of their occurrence.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 154-159
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Energy Consumption in the Production Chain of Heat from Pellet
Autorzy:
Marczak, Halina
Powiązania:
https://bibliotekanauki.pl/articles/103185.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pellet heat production
pellet life cycle
energy consumption
energy efficiency
energy expenditure
energy benefits
produkcja ciepła z peletu
cykl życia peletu
zużycie energii
efektywność energetyczna
wydatek energetyczny
korzyści energetyczne
Opis:
Wood pellets, as a renewable energy source, are an alternative to fossil fuels. Their use contributes to the quantitative protection of the traditional energy resources which are non-renewable and single use. The combustion of pellets has a neutral effect on increasing the concentration of carbon dioxide in the atmosphere. An important environmental aspect of the Life Cycle Assessment of pellets is the energy consumption over its life cycle. The results of this assessment can be helpful in improving the environmental management in the companies related to the pellet life cycle. They can also be used in the comparative assessment of pellets and other energy carriers in terms of the environmental load resulting from the energy consumption over the entire life cycle of the analyzed fuels. The work aimed at analyzing and assessing the energy efficiency of using wood pellet taking into account its life cycle. In order to achieve the purpose of the work, the energy efficiency index, calculated as the quotient of energy benefits and energy expenditure incurred at individual stages of the pellet life cycle, was used. The results of the analysis indicate that among the studied stages of the pellet life cycle, the highest energy consumption occurs in the pellet use and production phases. Research shows that the energy benefits expressed in the amount of energy emitted in the form of heat in the pellet combustion process outweigh the energy expenditure being the sum of energy spent in subsequent stages of the pellet life cycle. The obtained results indicate a positive energy balance. The use of pellets for heating purposes allows for the recovery of energy spent throughout its entire life cycle.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 2; 206-214
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the susceptibility of biomass to attempts at improving the durability of pellets
Ocena podatności biomasy na próby poprawy wytrzymałości mechanicznej pelletów
Autorzy:
Markowski, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1834044.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
biomass
pellet
mechanical strength
bulk density
durability
biomasa
wytrzymałość mechaniczna
gęstość nasypowa
Opis:
W ramach przeprowadzonych badań stałego paliwa biomasowego dokonano oceny jednego z najważniejszych parametrów tego typu paliw – wytrzymałości mechanicznej, będącej miarą odporności na warunki panujące w trakcie transportu i przechowywania paliwa. W celu dokonania oceny podatności wybranych typów biomasy na próbę poprawy wytrzymałości mechanicznej uzyskanych z tej biomasy pelletów wykorzystano 5 rodzajów biomasy: trociny sosnowe, makuchy rzepakowe, makuchy lniane, śrutę rzepakową i otręby pszenne. Jako dodatki poprawiające wytrzymałość mechaniczną pelletów zastosowano substancje organiczne i nieorganiczne: szkło wodne, cukier, skrobię ziemniaczaną, tlenek wapnia i lignosulfonian wapnia. Badania wytrzymałości przeprowadzono według metody PN-EN ISO 17831. Wyniki tych badań wykazały, że biomasa, która najlepiej poddaje się uszlachetnieniu, to trociny – tylko one wykazują wyższą wytrzymałość mechaniczną po zastosowaniu wybranych dodatków uszlachetniających. W przypadku pozostałych rodzajów biomasy nie ma sensu stosowania w procesie pelletyzacji żadnego z wyżej wymienionych dodatków. Natomiast najskuteczniejszymi dodatkami poprawiającymi wytrzymałość mechaniczną, spośród badanych w tym projekcie, były cukier i lignosulfonian wapnia. Substancje organiczne okazały się skuteczniejszymi dodatkami niż substancje nieorganiczne. Najlepszą kombinacją biomasy i dodatków w badaniu były trociny z dodatkiem cukru lub lignosulfonianu wapnia – pomijając wynik otrzymany dla nieuszlachetnionych makuchów rzepakowych, takie kombinacje uzyskały dwa najlepsze wyniki pomiarów wytrzymałości. Przeprowadzono również pomiar gęstości nasypowej badanych surowców i otrzymanych pelletów w celu określenia celowości produkcji pelletów. W przypadku makuchów lnianych i śruty rzepakowej przyrost gęstości nasypowej był tak niski, że nie uzasadniało to poniesienia niezbędnych w tym procesie nakładów finansowych. Również wyniki pomiaru wytrzymałości mechanicznej otrzymanych z tych rodzajów biomasy pelletów były najgorsze spośród wszystkich badanych biomas, co dodatkowo podważa sens produkcji pelletów z takich surowców.
Źródło:
Nafta-Gaz; 2020, 76, 12; 965--968
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concentration of Nitrogen Oxides When Burning Wood Pellets of Various Origins
Autorzy:
Ciupek, Bartosz
Gołoś, Karol
Powiązania:
https://bibliotekanauki.pl/articles/123284.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nitrogen oxide
heating boiler
emission
wood pellet
Opis:
The paper examined the impact of wood pellets of different type on the emission of nitrogen oxides (NOx) formed during the combustion process in a low-power heating boiler. The study aim was to determine the dependencies of the NOx emission levels on the chemical composition of fuel. The test was carried out using a model of a combustion chamber equipped with a dedicated burner. The analysis of the results confirmed the relationship between flue gas and the formation of NOx. The obtained results prove the possibility of reorganizing the combustion process in order to reduce the NOx emission by selecting a proper composition of raw materials when producing wood pellets.
Źródło:
Journal of Ecological Engineering; 2020, 21, 5; 229-233
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of binder additive on mechanical properties of straw pellet
Autorzy:
Zdanowicz, Agnieszka
Ondruška, Juraj
Chojnacki, Jerzy
Križan, Peter
Berner, Bogusława
Matúš, Miloš
Powiązania:
https://bibliotekanauki.pl/articles/95181.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
biomass
pellet
binder
biomasa
pelet
spoiwo
Opis:
Research was carried out into the impact of the content of wheat flour in a mixture with chopped wheat straw and the humidity of this material on the hardness of the pellet obtained from this raw material. The maximum content of wheat flour was 9.6% of the dry matter of the raw material, and the humidity of the raw material was 11.6, 25.7 and 36.0%. An increase of wheat flour content in the whole range examined considerably increased the pellet hardness, while an increase of humidity content in the raw material had an impact on increased hardness up to 25.7% only.
Źródło:
Journal of Mechanical and Energy Engineering; 2019, 3, 1; 85-88
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości zagospodarowania wybranych rodzajów biomasy do celów energetycznych
Possibilities of using selected types of biomass for energy purposes
Autorzy:
Bala-Litwiniak, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1385045.pdf
Data publikacji:
2019
Wydawca:
Polskie Wydawnictwo Ekonomiczne
Tematy:
biomasa
pelet
domowy kocioł grzewczy
paliwo odnawialne
biomass
pellet
renewable fuel
domestic boiler
Opis:
W pracy przedstawiono możliwości wykorzystania czterech rodzajów biomasy jako paliwa w domowym kotle grzewczym. Analizie poddano trociny sosnowe, świerkowe, łuskę słonecznika i słomę kukurydzianą. Materiały poddano procesowi pelletyzacji. Określono ich wybrane właściwości fizykochemiczne i skład elementarny. Dokonano również analizy ekonomicznej dla uzyskanych pelletów. Wykazano, że analizowane rodzaje biomasy — ze względu na konkurencyjną cenę, wysoką kaloryczność i skład elementarny — mogą być z powodzeniem stosowane jako paliwo w domowych kotłach grzewczych.
In this study a possibility of using four types of biomass as a fuel in a domestic heating boiler has been investigated. Pine and spruce sawdust, sunflower husk and corn straw were analyzed. Analyzed materials were pelletized. Selected physicochemical properties as well as the elemental composition of the obtained pellets was determined. An economic analysis was also carried out. The experimental results show that the analyzed types of biomass, due to their competitive price, high calorific value and appropriate elemental composition, can be successfully used as fuel in domestic heating boilers.
Źródło:
Gospodarka Materiałowa i Logistyka; 2019, 11; 49-54
1231-2037
Pojawia się w:
Gospodarka Materiałowa i Logistyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of pellet technology on direct reduction of jarosite residues from zinc hydrometallurgy
Autorzy:
Wang, Yayun
Yang, Huifen
Hou, Xiaoqiang
Gao, Wenjie
Gui, Haiping
Liu, Qian
Powiązania:
https://bibliotekanauki.pl/articles/110389.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
jarosite residues
direct reduction
powdery jarosite
pellet jarosite
gas concentration analysis
Opis:
In this study, the coal-based direct reduction technique has been applied to recover the valuable metals lead, zinc and ions from powdery and pellet jarosites. The influence of coal dosage of powdery and pellet jarosite separately on the volatilization rates of lead and zinc and on the metallization rate of iron was investigated. Results showed that the lead and zinc in both powdery and pellet jarosite could be effectively reduced with the volatilization rates higher than 95% and 99%, respectively. However, the iron reduction efficiency of pellet jarosite is better than that of powdery jarosite. The concentration of CO and CO2 gas produced in the reduction process of two types of jarosite were detected and compared to investigate the difference of reduction mechanism between powdery and pellet jarosite. The result showed that the utilization of both CO and C during the reduction of pellet jarosite was higher than that of powdery jarosite. The theoretical analysis was carried out by gas analysis and scanning electron microscopy and energy dispersive spectrometer (SEM-EDS).
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 802-811
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł

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