scholarly journals A Logistics Management System for a Biomass-to-Energy Production Plant Storage Park

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5512
Author(s):  
Leonel J.R. Nunes ◽  
Jorge T. Pereira da Costa ◽  
Radu Godina ◽  
João C.O. Matias ◽  
João P.S. Catalão
Keyword(s):  
Energy Production ◽  
Raw Materials ◽  
Raw Material ◽  
Production Unit ◽  
Production Plant ◽  
Fossil Energy ◽  
Profit Margins ◽  
Biomass Storage ◽  
Logistics Management System ◽  
The One

The biomass industry is growing due to the current search for greener and more sustainable alternatives to fossil energy sources. However, this industry, due to its singularity, presents several challenges and disadvantages related to the transportation of raw materials, with the large volumes that are usually involved. This project aimed to address this internal logistics situation in torrefied biomass pellets production with two different biomass storage parks, located in Portugal. The main park receives raw material coming directly from the source and stores it in large amounts as a backup and strategic storage park. The second park, with smaller dimensions, precedes the production unit and must be stocked daily. Therefore, a fleet of transport units with self-unloading cranes is required to help to unload the biomass at the main park and transport the raw material from this park to the one preceding the production unit. Thus, the main goal was to determine the dimensions of the fleet used in internal transportation operations to minimize the idle time of the transport units using a methodology already in use in the mining and quarrying industry. This methodology was analyzed and adapted to the situation presented here. The implementation of this study allows the elimination of unnecessary costs in an industry where the profit margins are low.

scholarly journals Mechanical Properties of Alkali Activated Material Based on Red Clay and Silica Gel Precursor

2021 ◽  
Vol 25 (1) ◽  
pp. 931-943
Author(s):  
Girts Bumanis ◽  
Danute Vaiciukyniene
Keyword(s):  
Silica Gel ◽  
Raw Materials ◽  
Raw Material ◽  
Alkali Activation ◽  
Production Plant ◽  
X Ray Diffraction ◽  
Red Clay ◽  
Significant Strength ◽  
Naoh Solution ◽  
Alkali Activated

Abstract The search for alternative alumosilicates source for production of alkali activated materials (AAM) is intensively researched. Wide spread of natural materials such as clays and waste materials are one of potential alternatives. In this research AAM was made from local waste brick made of red clay and calcined low-carbonate illite clay precursor and its properties evaluated. Waste silica gel containing amorphous silica from fertilizer production plant was proposed as additional raw material. 6 M and 7 M NaOH alkali activation solutions were used to obtain AAM. Raw materials were characterized by X-ray diffraction, laser particle size analyser, DTA/TG. Raw illite clay was calcined at a temperature of 700 to 800 °C. Waste brick was ground similar as raw clay and powder was obtained. Replacement of red clay with silica gel from 2–50 wt.% in mixture composition was evaluated. Results indicate that the most effective activator was 6 M NaOH solution and AAM with strength up to 13 MPa was obtained. Ground brick had the highest strength results and compressive strength of AAM reached 25 MPa. Silica gel in small quantities had little effect of AAM strength while significant strength reduction was observed with the increase silica gel content. The efflorescence was observed for samples with silica gel.

PROPERTIES OF BOILER FUEL COMPOUNDED BY NARROW FUEL FRACTIONS

2021 ◽  
pp. 22-29
Author(s):  
K. Shevchenko ◽  
A. Grigorov ◽  
I. Sinkevich
Keyword(s):  
Raw Materials ◽  
Fire Hazard ◽  
Flash Point ◽  
Fuel Oil ◽  
Raw Material ◽  
Material Base ◽  
Boiler Fuel ◽  
Performance Properties ◽  
Lower Heat ◽  
The One

In order to improve the performance properties, in particular viscosity-temperature, of boiler fuel, it is proposed to combine them with narrow fuel fractions obtained by thermal destruction of secondary polymer raw materials (low pressure polyethylene and polypropylene). When compounding grade 100 fuel oil with narrow fuel fractions, the values ​​of density are reduced to 865 (873) kg / m3, conditional viscosity to 2.50 (2.63) deg. um., pour point up to 8 (13) °C), sulfur content up to 0.17 wt%. and the lower heat of combustion increases to 43606 (43850) kJ / kg. At the same time, there is a gradual decrease in the value of the flash point to 114 (127) °C. This reduction is a negative point, which leads to increased fire safety of fuel oil during its use, storage, pumping and transport. However, the values of the flash point, according to the requirements of regulatory documentation, are within acceptable limits. That is, the value of this indicator can limit the content of fuel oil in narrow fuel fractions. It is determined that the rational concentration of narrow fuel fractions in the composition of fuel oil grade 100, is within 30% of the mass. Within these limits, there is a permissible decrease in flash point values – an indicator that characterizes the fire hazard of fuel oil during its use, storage, pumping and transportation against the background of improving other performance properties of fuel oil. The production of the proposed compound boiler fuel on the one hand allows to expand the raw material base of the process by involving in the production process secondary polymer raw materials – solid waste subject to mandatory disposal, on the other – to meet existing demand for boiler fuel by increasing its production.

scholarly journals Kajian Peningkatan Potensi Ekspor Pelet Kayu Indonesia sebagai Sumber Energi Biomassa yang Terbarukan

2018 ◽  
Vol 12 (1) ◽  
pp. 99 ◽  
Author(s):  
Victor Tulus Pangapoi Sidabutar
Keyword(s):  
Renewable Energy ◽  
Raw Materials ◽  
Renewable Energy Sources ◽  
The United States ◽  
Biomass Energy ◽  
Raw Material ◽  
Wood Pellets ◽  
Fossil Energy ◽  
Renewable Biomass ◽  
World Today

Dunia saat ini mulai beralih dari menggunakan batu bara ke sumber energi yang terbarukan. Salah satunya adalah pelet kayu demi mengurangi emisi gas rumah kaca dan meningkatkan penggunaan energi terbarukan pengganti energi fosil. Produsen utama pelet kayu di dunia saat ini adalah Amerika Serikat sedangkan untuk wilayah ASEAN adalah Vietnam. Di ASEAN, potensi Indonesia tidak kalah dari Vietnam. Indonesia unggul dalam jumlah luas hutan tanam dan pertanian yang lebih luas dibandingkan Vietnam. Selain itu, keragaman hayati tumbuhan yang ada dapat dijadikan sumber bahan baku pelet kayu yang unik dibandingkan pesaing lainnya. Legalisasi dan regulasi untuk keberlangsungan bahan baku merupakan persyaratan utama untuk memasuki pasar Eropa. Pemerintah Indonesia memberikan dukungan penuh dengan semakin mudahnya perijinan terkait legalisasi dan keberlangsungan bahan baku kayu. Study of Increasing the Export Potential of Indonesia Wood Pellets as a Source of the Renewable Biomass Energy SourceAbstractThe world today is beginning to switch from using coal into renewable energy sources. One of them is wood pellets in order to reduce greenhouse gas emissions and increase the use of renewable energy substitute for fossil energy. The major manufacturer of wood pellets in the world today is the United States, while for the ASEAN region is Vietnam. In ASEAN, Indonesia’s potential is not less than Vietnam. Indonesia superior in numbers of forests and agricultural crops compare to Vietnam. In addition, the existing plant biodiversity that can be used as a source of raw material for wood pellets are unique compared to other competitors. Legalization and regulation in terms of the sustainability of raw materials is a key requirement to enter the European market. The Indonesian government gave full support to the more easily permits related legalization and sustainability of wood raw material.

scholarly journals Personal adornments from the Eneolithic necropolis of Chirnogi-Suvita Iorgulescu (Romania):

2019 ◽  
Vol 46 ◽  
pp. 398-413
Author(s):  
Monica Margarit ◽  
Madalina Dimache
Keyword(s):  
Sus Scrofa ◽  
Raw Materials ◽  
Raw Material ◽  
Technological Transformation ◽  
Perforated Plates ◽  
Use Wear ◽  
High Terrace ◽  
The One ◽  
Archaeological Excavations ◽  
Over Time

The Necropolis of Chirnogi – Suvita Iorgulescu (Calarasi county) was located on the high terrace of the Danube and was investigated by Done Serba˘nescu (in 1989) by means of the archaeological excavations carried out for the construction of the Danube-Bucharest Channel. For this study, we analysed the archaeological assemblage preserved in the Museum of Gumelnita civilization from Oltenita (Calarasi county) coming from 10 graves, out of a total of 58, which are attributed to the Gumelnita culture (the second half of the 5th millennium BC). The personal adornments are mainly bracelets made of Spondylus valve (16 specimens) which appear in most of the graves, along with an equal number of perforated plates made of Sus scrofa canine, this time the pieces being grouped into two graves. The funeral inventory is complemented by small cylindrical, tubular or biconvex beads, made of various raw materials: Spondylus valve, bone, malachite, cooper and green slate. At the technical level, attention is drawn towards the technological transformation scheme of the raw material, which is extremely uniform for the two main categories of ornaments. Also, the analysed pieces showed different degrees of use-wear, demonstrating on the one hand that they were worn before the deposition in graves, and on the other that the accumulationof these items took place over time.

scholarly journals OPTIMAL CONTROL WITH LOAD OF DEVICES FOR HYDRO PURIFICATION OF FUELS TAKING INTO ACCOUNT CHANGE IN SULFUR CONTENT IN INCOMING ROW MATERIAL

2017 ◽  
Vol 60 (2) ◽  
pp. 91
Author(s):  
Hasan A. Nagiev ◽  
Firuza A. Alieva
Keyword(s):  
Optimal Control ◽  
Sulfur Content ◽  
Raw Materials ◽  
Modeling Method ◽  
Sulphur Content ◽  
Raw Material ◽  
Successive Approximation Method ◽  
Production Plant ◽  
Imitational Modeling ◽  
Stated Problem

The problem of controlling the speed of introduction of raw materials into processing in industrial plants for hydro desulphurization of fuels connected with considerable differences in their sulphur content is discussed. The main production- and logistic problems of appearance of dynamically changing deviations from a number of norms relating to sulphur content in raw materials being fed into cleansing reactor are presented. The problem of selecting such strategy of controlling the current capacity is stated which is optimal both from the points of view of quality indicator of raw material cleanliness and of realizability of the fuel processing volume being planned. The mathematical statement of the problem is given differing from customary problems of positional control by the consideration of quality indicators of raw materials and limitations on maximally admissible output of plants for raw material processing. The principal difference consists in the introduction of stabilizing feedback concerning consumption resource dynamics which can be realized by means of inclusion of a certain Lagrangian function being optimized. The association of this function with function of perturbing factor distribution, i.e. with changeability of sulphur content in raw material turns a conventional problem of static optimization into the problem of optimal control with integral limitation on the current capacity. For solving the stated problem optimal control, the theory has successive approximation method as well as imitational modeling method. The simplest way of solution from algorithmic point of view is the use of imitational modeling method. The playing out of a random quality in solving similar problems is prescribed through generators of random numbers. This problem is solved in the presented paper by way of imitational modeling method using an empirical mathematical model made on the basis of data of passive observation of process operation of a production plant. With the help of computer simulation means a system of imitating an external perturbing factor is created through which synthesis of stabilizing feedback is made relative to realizability of output volume in the predetermined period. Some realizations of feedback are given permitting to perform analysis and offer recommendations for successful solution of the stated problem of optimal distribution of loads under conditions of external perturbances caused by raw material quality. It is demonstrated that for problems with sufficiently prolonged planning interval. When its statistical parameters are safely protected by an arbitrary realization of a random perturbance, programmed control through feedback circuit proves to be more effective and guarantees higher accuracy of process optimality on the whole. For citation:Nagiev H.A., Alieva F.A. Optimal control with load of devices for hydro purification of fuels taking into account change in sulfur content in incoming row material. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N2. P. 91-97.

Staining Natural Rubber with Silver Nitrate for Electron Microscopy

1977 ◽  
Vol 50 (4) ◽  
pp. 835-841 ◽  
Author(s):  
R. W. Smith ◽  
V. L. Folt
Keyword(s):  
Electron Microscopy ◽  
World War Ii ◽  
Natural Rubber ◽  
Silver Nitrate ◽  
Raw Materials ◽  
Natural Rubber Latex ◽  
Optical Microscope ◽  
Raw Material ◽  
World War ◽  
The One

Abstract Hevea brasiliensis or natural rubber (NR) has been used for over 500 years. Until World War II, it was the basic raw material of the rubber industry. Since that time, the use of synthetic polymers has steadily increased, but the importance of NR has not diminished. In fact, the future for the natural product is very promising since it is the one polymer that is obtainable without depleting fossil fuel raw materials. Natural rubber latex has been extensively studied by a variety of methods, especially the microscope. All of the early work with NR latex was conducted, of course, with the optical microscope. In the late 1940's the electron microscope began to be used, but at that time synthetic rubbers began to demand attention, and work on NR latex diminished. Perhaps investigators felt they knew all there was to know about the microscopical characteristics of this material. Indeed, some very fine work had been done and keen observations made with optical microscopes that could not even resolve all of the particles in a latex material. This paper deals with the electron microscopy of natural rubber latexes with particular attention to the proteinaceous layer on the particle and the fate of particles during varying stages of mastication. The critical technique used was to stain the proteinaceous layer of the latex particle with silver nitrate.

scholarly journals OPTIMIZE, UPGRADE OR INVEST IN A NOVEL DRYER? – A BRICK FACTORY CASE STUDY

2021 ◽  
Vol 1 (2) ◽  
pp. 62-70
Author(s):  
Miloš R. Vasić ◽  
◽  
Milica V. Vasić ◽  
Keyword(s):  
Raw Materials ◽  
Ambient Air ◽  
Raw Material ◽  
Drying Process ◽  
Tunnel Dryer ◽  
Large Size ◽  
Speed Up ◽  
The One ◽  
Industrial Level ◽  
Energy Balances

Drying has an enormous impact on the quality of final masonry clay elements. The accumulated knowledge about modeling the drying process, as well as the registered progress in computing the coupling between the heat and mass transfer during the last decade has reached the applicative industrial level. The available novel commercial drying solutions have dropped the drying cycle to 5 hours for hollow clay products and up to 9 hours for clay blocks of large size and weight. The ability to speed up the drying process also strongly depends on the properties of the raw materials. The decision on optimization of the existing dryer and its upgrade or investment in a novel drying facility must be experimentally validated. Results of the one-month monitoring and analysis of the production process in one Serbian brick factory including the material and energy balances are given in this paper. Based on the collected data, raw material limitations and costs of the novel dryer the existing tunnel dryer upgrade and the minimization of the "false" ambient air into the dryer are proposed.

scholarly journals Personal adornments from the Eneolithic necropolis of Chirnogi-Suvita Iorgulescu (Romania):

2019 ◽  
Vol 46 ◽  
pp. 398-413
Author(s):  
Monica Margarit ◽  
Madalina Dimache
Keyword(s):  
Sus Scrofa ◽  
Raw Materials ◽  
Raw Material ◽  
Technological Transformation ◽  
Perforated Plates ◽  
Use Wear ◽  
High Terrace ◽  
The One ◽  
Archaeological Excavations ◽  
Over Time

The Necropolis of Chirnogi – Suvita Iorgulescu (Calarasi county) was located on the high terrace of the Danube and was investigated by Done Serba˘nescu (in 1989) by means of the archaeological excavations carried out for the construction of the Danube-Bucharest Channel. For this study, we analysed the archaeological assemblage preserved in the Museum of Gumelnita civilization from Oltenita (Calarasi county) coming from 10 graves, out of a total of 58, which are attributed to the Gumelnita culture (the second half of the 5th millennium BC). The personal adornments are mainly bracelets made of Spondylus valve (16 specimens) which appear in most of the graves, along with an equal number of perforated plates made of Sus scrofa canine, this time the pieces being grouped into two graves. The funeral inventory is complemented by small cylindrical, tubular or biconvex beads, made of various raw materials: Spondylus valve, bone, malachite, cooper and green slate. At the technical level, attention is drawn towards the technological transformation scheme of the raw material, which is extremely uniform for the two main categories of ornaments. Also, the analysed pieces showed different degrees of use-wear, demonstrating on the one hand that they were worn before the deposition in graves, and on the other that the accumulationof these items took place over time.

Catalytic Dehydrogenation of Monoölefins to Diolefins. Source Materials for Synthetic Rubber and Resins

1940 ◽  
Vol 13 (3) ◽  
pp. 533-538
Author(s):  
Aristid V. Grosse ◽  
Jacque C. Morrell ◽  
Julian M. Mavity
Keyword(s):  
Raw Materials ◽  
Raw Material ◽  
Metallic Sodium ◽  
Catalytic Dehydrogenation ◽  
Hydrocarbon Gases ◽  
Present Contribution ◽  
Similar Work ◽  
Synthetic Rubber ◽  
Petroleum Resources ◽  
The One

Abstract Aside from the scientific value of the method described here for the catalytic dehydrogenation of monoölefins to diolefins, the present contribution has an important industrial, commercial, and military value, viz., as an economic source of raw material for synthetic rubber. The production of butenes from butanes and pentenes from pentanes has already been described. The present paper, showing the production of butadiene from butenes and isoprene from pentenes, is the connecting link between the billions of cubic feet of butanes present in natural and cracked gases and of butenes present in the latter, and the billions of gallons of pentanes available in natural gasoline and crude oil on the one hand, and the production of synthetic rubber from these raw materials on the other. The basic raw materials for the production of synthetic rubber therefore now include our tremendous resources of hydrocarbon oils, hydrocarbon gases, and coal to produce synthetic hydrocarbons, if and when our petroleum resources become exhausted. The production of synthetic rubber from butadiene and isoprene is well known. Wallach exposed isoprene to light and produced synthetic rubber. Matthews and Harries independently used metallic sodium to polymerize isoprene to rubber. Similar work has also been done bv others.

scholarly journals Provenance of archaeological wool textiles: new case studies

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Karin M. Frei
Keyword(s):  
Case Studies ◽  
Iron Age ◽  
Raw Materials ◽  
Experimental Studies ◽  
Raw Material ◽  
Data Sets ◽  
Basement Rocks ◽  
New Information ◽  
The One ◽  
Musk Ox

In the last two decades, measurements of strontium (Sr) isotopes in archaeological bone tissues/skeletons have shown to be an effective technique for the characterisation of human and animal mobility in prehistory. More recently, this tracing system is also being applied to the investigation of archaeological textile’s provenance. The importance of ancient textiles has been often underestimated, however research of archaeological textiles is currently experiencing an extremely increasing interest as the development of new methodologies, conducting experimental studies and lancing of new projects are providing an unreached amount of new information, knowledge and impressive data sets which together build the basis of novel thinking and interpretations. This manuscript aims at summarising two of the most recently developed methods that focus on the extraction of Sr from ancient non-dyed and organic-dyed wool threads from archaeological textiles in an attempt to identify if the raw materials are local or non-local to the sites. In particular, this study presents two case studies which rely on the use of these chemical protocols. The first example deals with a wool/fur sample from a modern Greenlandic Musk ox. The purpose of this study is to characterise wool from an exotic animal on the one side, and to try to establish a link between this wool and a geologically-seen ancient and very special terrain (Archaean basement rocks from the Kangerlussuaq area of Western Greenland) on which this musk ox was grazing. Our interest was focused on whether the bioavailable Sr fraction from this terrain impacted on the composition of the wool from the animal. The second case study deals with three thread samples from four ancient wool textile pieces recovered from one and the same pre-Roman Iron Age peat bog site at Krogens Mølle (Denmark). Some of these textiles have proven to be dyed with organic dyestuffs. This study therefore aimed at applying a novel pre-cleaning methodology developed for dyed (by organic dyestuffs) wool threads from ancient textiles. The outcome of these two particular studies revealed both the potential of these novel methodologies for retrieving the original Sr isotope signature of the raw material wool, and their limitations.

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