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Biomass quality of some Asteraceae species for solid biofuel purposes in Moldova

In the latest years, the rapid changes in global climate, such as the depletion of fossil fuel resources, have motivated an increasing interest in renewable energy production, and phytomass represents a good opportunity. The purpose of this research was to evaluate some biological features, physical and mechanical characteristics of the dry biomass of the Asteraceae species: Artemisia annua, Artemisia absinthium, Helianthus annuus and Helianthus tuberosus from the experimental land of the Botanical Garden (Institute), control variants – wheat straw, Triticum aestivum. The physical and mechanical characteristics of dry biomass were determined according to the European Standards at the State Agrarian University of Moldova, the production of solid fuels – by the equipment developed at the Institute of Agricultural Technique "Mecagro", Chişinău. It was determined that the biomass productivity reached 0.72 - 0.93 kg/m2 of Artemisia annua, 0.90-1.31 kg/m2 of Artemisia absinthium and 2.53-2.80 kg/m2 ofHelianthus tuberosus.It was established that the stems of Helianthus tuberosusdefoliated faster than Artemisia annua and Artemisia absinthium. The bulk density of the milled chaffs varied from 118 kg/m3 to 188 kg/ m3. The biomass of Asteraceae species was distinguished by high gross calorific value (18.9-19.7 MJ/kg) and moderate ash content (2.1-3.5%). The specific density of briquettes made of biomass of Asteraceae species reached values of 800-911 kg/m3, but the bulk density of briquettes – 423-472 kg/m3. The cultivation and the harvest of these species do not require special farm machinery

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BIOMASS QUALITY OF SOME POACEAE SPECIES AND POSSIBLE USE FOR RENEWABLE ENERGY PRODUCTION IN MOLDOVA

Biomass makes a major contribution to the world and nation’s renewable energy portfolio. Plant biomass represents stored energy that may be drawn upon on demand, can be converted into energy by combustion, producing cellulosic ethanol and biogas. Domestication of new species as dedicated energy crops may be necessary. Currently Poaceae species are the most commonly utilized herbaceous plants as raw material for the production heat energy by direct combustion process in Moldova. The objective of this research was to evaluate some physical and mechanical properties of dry biomass of the new Poaceae species: Miscanthus giganteus and Sorghum almum collected from the experimental land of the Botanical Garden (Institute), control variants – wheat straw, Triticum aestivum and corn stalks, Zea mays. The physical and mechanical properties of dry biomass were determined according to European Standards in the State Agrarian University of Moldova, the production of solid fuels – by the equipment developed in the Institute of Agricultural Technique "Mecagro" Chişinău. In the field it has been established that Miscanthus giganteus stems defoliated faster than Zea mays, the stems of Sorghum almum dehydrated rapidly. The bulk density of the milled chaffs by sieve 10 mm and 6 mm of the tested energy crops was 90-167 kg/m3 and 163-198 kg/m3, respectively. The specific density of briquettes reached 740-923 kg/m3, but the specific density of pellets – 1007-1262 kg/m3. The Miscanthus giganteus was distinguished by high density, gross calorific value (19.3 MJ/kg) and low ash content (2.23 %); Sorghum almum biomass moderately gross calorific value (18.6 MJ/kg) and ash content (3.71 %); Zea mays high specific density of solid fuel (923 and1124 kg/m3); wheat straw lowest bulk density and calorific value, and high ash content (4.93 %).

Miscanthus giganteus and Sorghum almum are promising energy crops for the production solid biofuel in Moldova.

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Влияние коэффициента полнодревесности сырья на производительность рубильной машины барабанного типа

В статье отражён опыт испытания машины для переработки отходов лесозаготовок и других древесных материалов на технологическую щепу. Определена степень влияния на производительность машины коэффициента полнодревесности сырья и эффекта торможения сырья ножами измельчающего барабана. По результатам анализа даны рекомендации по использованию рубильных машин барабанного типа для древесных материалов различных размеров.

 

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TESTAREA MAȘINII DE STROPIT CU RECUPERAREA SOLUȚIEI DE LUCRU

In articol sunt prezentate descrierea construcției, metodele de cercetare și rezultatele testărilor mașinii de stropit vița-de-vie cu recuperarea soluției de protecție. Economia soluției de lucru constituie 38%

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Cercetările şi încercările de exploatare a maşinei de stropit STRU-24-3000

REZUMAT: Articolul dat include metodici de încercări şi cercetări a parametrilor tehnici şi agrotehnici al stropitoarelor cu rampă p-u culturile de cîmp:  inclusiv calibrarea lor, concomitent cu verificarea funcţională a sistemului SECC; aprecierea funcţională a dispozitivului de stabilizare al rampei.

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Эксплуатационные испытания измельчителя веток и виноградной лозы

Реферат - В статье отражён опыт испытания машины для измельчения продуктов обрезки садов и виноградников. Приведены результаты фракционного состава  конечного продукта в зависимости от формы и расположения противорежущих пластин в измельчающей камере. Определена мощность, потребляемая на измельчение веток и лозы различных размеров и степеней влажности. По результатам анализа полученных зависимостей даны рекомендации по использованию измельчителей для различных хозяйственных целей и их агрегатирования с тракторами распространённых марок.

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ELABORAREA UTILAJULUI ȘI TESTAREA PRESEI DE BRICHETARE

Rezumat . Complexul constituie dintr-un tocator al masei vegetale care este conectat printr-o conductă, care transportă materialul tocat spre ciclon. În ciclon are loc separarea particolelor materialului destinat brichetării de pulberele de praf aflat în paie, după care masa alunecă pe corpul ciclonului fiind transportată de fluxul de aer a ventilatorului tocatorului spre închizătorul cu ecluze. Masa tocată ajungînd în buncherul dozator este amestecată de paletele buncherului, după care materialul se dozează cu o productivitatea stabilită presa de brichetare cu ajutorul melcului buncherului dozator. Pentru obținerea brichetelor calitative se poate de efectuat dozarea materialului în camera blocului de presare a presei de brichetare pe două căii: dozarea verticală și dozarea orizontală a materialului. După procesul de presare, brichetele sunt transportate prin răcitorul natural pentru răcirea lor spre depozitare.

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Contacte

Republica Moldova
Chişinău, str. Miron Costin 7
Tel. +373 (22) 49–21–31

Departamentul vînzari:

Tel. +373 (68) 48–89–99
Tel. +373 (67) 43–66–98
Tel. +373 (22) 43–86–38
Fax +373 (22) 47–36–98
Email: marketing@mecagro.md

Adresa magazinului:

Chișinău, str. Meșterul Manole 4
Tel. +373 (22) 47–53–41

Căutare

Prezentare IS ITA Mecagro

Activitatea tehnico-ştiinţifică şi financiară