Wyniki wyszukiwania - BazTech

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Thermodynamic assessment on the integration of thermo-electric modules in a wood fireplace

Baldini Andrea, Cerofolini Luca, Fiaschi Daniele, Manfrida Giampaolo, Talluri Lorenzo

Civil and Environmental Engineering Reports

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2019

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Vol. 29, no. 4

218--235

EN

The growing demand for electricity produced from renewable sources and the development of new technologies for the combustion of biomass, arose a growing interest on the possible coupling of thermoelectric modules with stove-fireplaces. The current thermoelectric generators have a solid structure, do not produce noise, do not require maintenance and can be used for the recovery of waste heat or excess, at the same time they hold a very low conversion efficiency and they need an adequate cooling system. Nevertheless, they still hold a cost, which is still too high to make them attractive. Nonetheless, if the modules are applied to a heat source which otherwise would be wasted, the attractiveness of the solution certainly rises. In this study, a thermodynamic analysis of a stove-fireplace is presented, considering both combustion process and the flame – walls heat transfer of the. A design solution for a concentrator device to funnel the wasted heat from the fireplace to the thermo-electric modules is also presented.

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Próby pozyskania potasu i fosforu z popiołu lotnego z biomasy

Żelazny S., Čablik V., Čablikova L.

Przemysł Chemiczny

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2015

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T. 94, nr 6

956-959

PL

W pracy zawarto wyniki badań popiołu lotnego ze spalania biomasy z Elektrowni Połaniec. Poprzednio (1) przedstawiono wyniki badań dotyczących odzysku potasu i fosforu z popiołu za pomocą ługowania wodą w różnych temperaturach i przy różnym czasie ługowania. W publikowanej części przedstawiono wyniki badań odzysku tych pierwiastków za pomocą roztworów kwasu azotowego oraz siarkowego. Przebadano otrzymany produkt i pozostałość po ługowaniu.

EN

Flay ash from industrial combustion of biomass was leached with dild. (10%) H₂SO₄ and HNO₃ to recover K and P. The leaching with HNO₃ was more efficient than with H₂SO₄ and resulted in recovering up to 70.2% K and up to 60.4% P contained in the flue ash.

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Emisja tlenku azotu NOx ze spalania biomasy wierzbowej

Sztyma-Horwat M., Styszko L.

Rocznik Ochrona Środowiska

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2011

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Tom 13

787-800

PL

Celem pracy była ocena emisji NOx ze spalania biomasy wierzbowej kilku klonów wierzby krzewiastej (Salix viminalis) pozyskanej w drugim, trzecim i czwartym roku uprawy w rejonie Koszalina, na glebie lekkiej, na zróżnicowanym nawożeniu organicznym i mineralnym.

EN

In the study the influence of combustion of shrubby willow shoots was evaluated in laboratory conditions upon the content of the nitrogen oxide NOx in combustion gases. Analyses covered biomass of nine willow's clones cultivated four years in light soil using compost from municipal sewage sludge and diverse doses of fertilizer Hydrofoska 16. Samples of biomass were taken in two terms (directly after mowing during winter and at the turn of May and June). The combustion of samples of willow biomass from the willow's crop after the harvest in the first and second term in years 2008÷2010 was carried out in temperatures: 300°C, 600°C, 900°C and 1200°C. During combustion the intensity of air flow amounted to 8.0 dm3 ź min-1. Formation of nitrogen oxide NOx during combustion of willow biomass was mostly influenced by temperatures of combustion (73.4%), less influenced by age of acquired willow shoots (10.6%), and joint action of temperature of combustion and age of the willow shoots (8.0%), and relatively little influenced but essential, by day of biomass harvesting (0.3%), fertilizer combinations (0.2%) and the willow clones (0.1%). The differences among extreme levels of factors under investigation concerning content of nitrogen oxide NOx in combustion gases in order of diminishing effects were ranked as follows: temperature of biomass combustion - 212.7 mg/m? NOx, age of the willow's shoots - 71.6 mg/m? NOx, fertilizer combina-tions - 12.0 mg/m? NOx, date of biomass sampling - 8.7 mg/m? NOx and the willow's clones - 8.5 mg/m? NOx. The smallest quantities of nitrogen oxide NOx formed in the process of combustion of biomass developed in temperature 300°C, and the highest in temperature 1200°C. Increase of combustion temperature from 300°C to 1200°C resulted in increase of the content of nitrogen oxide NOx in combustion gases. The smallest quantities of nitrogen oxide NOx produced during combustion of the willow biomass were obtained in fourth year of cultivation, and higher from cultivations in third and second year. The highest quantities of nitrogen oxide NOx produced during combustion of the biomass were generated from "d" objects, where the highest doses of compost and the fertilizer Hydrofoska 16 were applied. On the contrary, the smallest quantities of nitrogen oxide NOx were produced during combustion of biomass from "a" objects, where compost and fertilizer Hydrofoską 16 were not applied. Use of intensive organic and mineral fertilization (object "d") caused essential stronger air pollution by nitrogen oxide NOx than combustion of biomass originating from objects of lower mineral fertilization (object "c"). Higher quantities of nitrogen oxide NOx were produced during combustion of willow biomass from the first term of sampling biomass (February 2008 and 2009 and November 2009) than from the second term of sampling (at the turn of May and June). The highest quantities of the nitrogen oxide NOx were produced during combustion of willow biomass clone 1052 (127.8 mg/m?), and the smallest during combustion of clone 1033 (119.3 mg/m?). Creation of the nitrogen oxides NOx was influenced by double interactions also: fertilizer combinations with temperatures of combustion, fertilizer combinations with age of shoots, temperatures of combustion with term of sampling, temperatures of combustion with age of shoots and date of sampling with age of shoots, and also threefold interaction of temperatures of combustion with term of sampling and age of shoots and fourfold interaction of fertilizer combinations with temperatures of combustion, term of sampling and the age of shoots. Total interactions were responsible for 15.4% of content of nitrogen oxide NOx in combustion gases.

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Analiza termodynamiczna procesu spalania biomasy

Łapczyńska-Kordon B., Frączek J.

Autobusy : technika, eksploatacja, systemy transportowe

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2011

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R. 12, nr 10

298-304

PL

W artykule została przedstawiona analiza termodynamiczna spalania rozdrobnionych roślin energetycznych, oparta na bilansie substancji. Z pomocą obliczeń stechiometrycznych określono rzeczywiste zapotrzebowanie powietrza, ilości spalin suchych oraz ich skład. Wyniki obliczeń porównano z pomiarami wykonanymi na stanowisku laboratoryjnym podczas spalania wierzby energetycznej, miskanta olbrzymiego i ślazowca pensylwańskiego.

EN

This paper was presented thermodynamic analysis of combustion particulate feedstock, based on the balance sheet of the substance. With the help of stoichiometric calculations determined the actual air demand, the amount of dry flue gas and its composition. The calculation results were compared with measurements made on a laboratory during the combustion of the willow, the miscanthus and the Virginia mallow.