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Journal of Thermal Analysis and Calorimetry
Authors:
Romulo D. A. Andrade
,
Elaine A. Faria
,
Amaury M. Silva
,
Wandallas C. Araujo
,
Gustavo C. Jaime
,
Kenia P. Costa
, and
Alexandre G. S. Prado

]. The aim of this article is to study the heat of combustion of soybean oil, biodiesel and diesel-like produced from soybean oil and diesel/biofuels blends by using a bomb calorimetry. Experimental Chemicals and

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Abstract  

The thermal degradation behavior of P. halepensis needles treated with two ammonium-polyphosphate-based commercial retardants was studied using thermal analysis (DTG) under nitrogen atmosphere. Moreover, for the same experimental material, the heat of combustion of the volatiles was estimated based on the difference between the heat of combustion of the fuel and the heat contribution of the charred residue left after pyrolysis. The heat of combustion of the volatiles was exponentially related to the retardant concentration of the samples. In the range of retardant concentrations from 10 to 20% w/w the mean reduction percentage of the heat of combustion of the volatiles, with respect to untreated samples, was 18%.

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Journal of Thermal Analysis and Calorimetry
Authors:
J. Salgado
,
J. Proupín
,
M. Villanueva
,
J. Rodríguez-Añón
, and
N. Barros

Abstract  

Differential scanning calorimetry was applied to assess on seasonally soil organic matter changes. Soils were collected in two sites located in Viveiro (Galicia, Spain). One of them has been used as arable land and the other one was under pinewood. Soil samples were seasonally collected during a year. The heat of combustion and the ignition temperature of the soil organic matter were calculated by analyzing the thermograms obtained by differential scanning calorimetry. The shape and the maximum and end temperatures of the two exothermic peaks observed in the thermograms, yielded information about the relations between the labile and recalcitrant pools, and hence information about carbon stabilization degree in both soils.

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explained. Aims The aim of this study is to investigate fireline intensity at the laboratory scale by means of oxygen consumption (OC) calorimetry and to test Byram’s formulation. Effective heat of combustion and combustion

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effective heat of combustion d Total heat released e Avg mass loss rate (10

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-heated and burnt soil samples were analysed in a Differential Scanning Calorimeter (DSC 2920 TA) and a Thermogravimetric Analyser (TGA 7 Perkin Elmer). Heat of combustion of organic matter, ignition temperature and mass loss were obtained following the

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Thermal diesel-like analysis

Quality control by thermal and chemometric analysis

Journal of Thermal Analysis and Calorimetry
Authors:
Alexandre G. S. Prado
,
Rômulo D. A. Andrade
,
Jez W. B. Braga
, and
Paulo A. Z. Suarez

indicates that the TG method is appropriate to determine the adulterations of biofuel in routine analysis. Conclusions The addition of soybean oil increases the heat of combustion of biofuel, which is caused by the

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A modification of the Speil theory is used to compute the heat of combustion of textile fibres, via a standard curveΔH/S (S: thermal peak area of standards) against temperature (T).

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widely discussed in scientific literature [ 11 , 12 ]. Heat of combustion and calorific value of organic wastes and sewage sludge Limitations connected with possibilities of storing or environmental usage of organic waste and

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Abstract  

This work presents a study of the thermal decomposition of commercial vegetable oils and of some of their thermal properties by termogravimetry (TG), derivative termogravimetry (DTG) and by differential thermal analysis (DTA). Canola, sunflower, corn, olive and soybean oils were studied. A simultaneous SDT 2960 TG/DTA from TA Instruments was used, with a heating rate of 10 K min-1 from 30 to 700C. A flow of 100 mL min-1 of air as the purge gas was used in order to burnout the oils during analysis to estimate their heat of combustion. From the extrapolated decomposition onset temperatures obtained from TG curves, it can be seen that corn oil presents the highest thermal stability (306C), followed by the sunflower one (304C). Olive oil presents the lowest one (288C). The heat of combustion of each oil was estimated from DTA curves, showing the highest value for the olive oil. Except for corn oil, which presents a significantly different thermal decomposition behavior than the other oils, a perfect linear correlation is observed, with negative slope, between the heat of combustion of an oil and its respective extrapolated onset temperature of decomposition in air.

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