Made available in DSpace on 2016-01-26T18:56:24Z (GMT). No. of bitstreams: 1 LUIS EDUARDO VIEIRA Dissertacao.pdf: 865847 bytes, checksum: 06dc7bc2cf42a06b1d2f3aacb74baaea (MD5) Previous issue date: 2011-06-21 / Aiming to evaluate the interaction of hydrogel polymer and vegetation cover, in two planting systems (groove and windrow), the possible interference of the energy value of sugar cane biomass, at four dosages were used (0.0, 26.67, 53.33 and 80.00 kg of polymer per hectare) and four treatments with dry matter ratoon sugar cane, installed at the harvest of first cut in June 2009, and the concentrations (without leaves, in dose 0), dry leaves, at 5 t dry matter ha-1; green leaves at 10 t dry matter ha-1, and mixture of green leaves and dry leaves at 15 t dry matter ha-1. The experimental unit (plot) consisted of five rows with five meters long, with now spacing of 1.5 m (area of 37.5 m2). The experiment was located on the campus of UNOESTE II, and the soil was characterized as Sandy Red Yellow Distroferric, typical A moderate, middle-clay texture (Embrapa, 1999). The climate in the region is classified as Aw, with summer rainy season and dry season in winter. The cultivar used was RB 86 7515 planted in December 2007 and harvested in June 2009 (18 months), and the ratoon of this cultivar was used in this study. The experimental design was a factorial split plot (2x4), with two planting systems used in 2007 at crop installation process, with four doses of hydrogel polymer and four treatments with mulching. Evaluations were made regarding the calorific power of sugar cane during the months of August, September and October 2010, in addition to biomass productivity, levels of ATR and fiber of sugar cane for the month of August and top calorific power of straw in October 2010. All data were subjected to analysis of variance (ANOVA, p <0.05) and the means were compared by Scott-Knott (p <0.05) according to Gomes (1990). For the construction of graphs and statistical regressions the mathematical program Microcal Origin 6.0 was used. The results obtained show that planting systems not Groove terraces and promoted differences between themselves, when compared to the variables analyzed not experiment. The use of polymer the dose of 53,33 k ha-1 provided a higher biomass and bioenergy system per hectare. / Com o propósito de avaliar se a interação de polímeros hidroabsorventes e cobertura vegetal em dois sistemas de plantio (sulco e leira), viesse interferir no valor energético da biomassa de cana-de-açúcar, foram utilizadas as doses de (0,0; 26,67; 53,33 e 80,00 kg do polímero por hectare) e quatro tratamentos com cobertura vegetal, na soqueira de cana-de-açúcar, instalado quando da coleta do primeiro corte, em junho de 2009, sendo as concentrações (sem folhas, na dose 0 testemunha); folhas secas, na dose de 5 t de matéria seca ha-1; folhas verdes, na dose de 10 t de matéria seca ha-1; e mistura de folhas verdes mais folhas secas, na dose de 15 t de matéria seca ha-1. A unidade experimental (parcela) foi composta de cinco linhas com cinco metros de comprimento, sendo o espaçamento de 1,5 m (área de 37,5 m2). O experimento foi implantado no Campus II da UNOESTE, sendo que o solo do experimento foi caracterizado como Argissolo Vermelho-Amarelo Distroférrico, típico A moderado, textura médio-argilosa (Embrapa, 1999). O clima da região se classifica em Aw, sendo a estação chuvosa no verão e estação seca no inverno. O cultivar utilizado foi o RB 86 7515 plantado em dezembro de 2007 e colhido em junho 2009 (18 meses), a soqueira deste cultivar foi utilizada no presente estudo, o delineamento experimental utilizado foi o fatorial em parcelas subdivididas (2x4), sendo dois os sistemas de plantios utilizados, em 2007 quando do processo de instalação da cultura, quatro doses do polímero hidroabsorventes e quatro tratamentos com cobertura vegetal. Foram avaliados no experimento o poder calorífico superior da cana-de-açúcar nos meses de agosto, setembro e outubro de 2010, além da produtividade de biomassa, níveis de ATR e Fibra da cana-de-açúcar do mês de agosto e poder calorífico superior do palhiço no mês de outubro de 2010. Todos os dados foram submetidos à análise de variância (ANOVA, p<0,05) e ao teste de comparação de médias Scott-Knott (p<0,05) segundo Gomes (1990) e para a confecção dos gráficos e regressões estatísticas foi utilizado o programa matemático Microcal Origin 6.0. Os resultados obtidos demonstram que os sistemas de plantio leira e sulco não promoveram diferenças entre si, quando comparados em relação às variáveis analisadas no experimento. A utilização de polímero na dose de 53,33 kg ha-1 proporcionou uma maior produção de biomassa e bioenergia do sistema por hectare.

Made available in DSpace on 2016-07-18T17:51:08Z (GMT). No. of bitstreams: 1 LUIS EDUARDO VIEIRA Dissertacao.pdf: 865847 bytes, checksum: 06dc7bc2cf42a06b1d2f3aacb74baaea (MD5) Previous issue date: 2011-06-21 / Aiming to evaluate the interaction of hydrogel polymer and vegetation cover, in two planting systems (groove and windrow), the possible interference of the energy value of sugar cane biomass, at four dosages were used (0.0, 26.67, 53.33 and 80.00 kg of polymer per hectare) and four treatments with dry matter ratoon sugar cane, installed at the harvest of first cut in June 2009, and the concentrations (without leaves, in dose 0), dry leaves, at 5 t dry matter ha-1; green leaves at 10 t dry matter ha-1, and mixture of green leaves and dry leaves at 15 t dry matter ha-1. The experimental unit (plot) consisted of five rows with five meters long, with now spacing of 1.5 m (area of 37.5 m2). The experiment was located on the campus of UNOESTE II, and the soil was characterized as Sandy Red Yellow Distroferric, typical A moderate, middle-clay texture (Embrapa, 1999). The climate in the region is classified as Aw, with summer rainy season and dry season in winter. The cultivar used was RB 86 7515 planted in December 2007 and harvested in June 2009 (18 months), and the ratoon of this cultivar was used in this study. The experimental design was a factorial split plot (2x4), with two planting systems used in 2007 at crop installation process, with four doses of hydrogel polymer and four treatments with mulching. Evaluations were made regarding the calorific power of sugar cane during the months of August, September and October 2010, in addition to biomass productivity, levels of ATR and fiber of sugar cane for the month of August and top calorific power of straw in October 2010. All data were subjected to analysis of variance (ANOVA, p <0.05) and the means were compared by Scott-Knott (p <0.05) according to Gomes (1990). For the construction of graphs and statistical regressions the mathematical program Microcal Origin 6.0 was used. The results obtained show that planting systems not Groove terraces and promoted differences between themselves, when compared to the variables analyzed not experiment. The use of polymer the dose of 53,33 k ha-1 provided a higher biomass and bioenergy system per hectare. / Com o propósito de avaliar se a interação de polímeros hidroabsorventes e cobertura vegetal em dois sistemas de plantio (sulco e leira), viesse interferir no valor energético da biomassa de cana-de-açúcar, foram utilizadas as doses de (0,0; 26,67; 53,33 e 80,00 kg do polímero por hectare) e quatro tratamentos com cobertura vegetal, na soqueira de cana-de-açúcar, instalado quando da coleta do primeiro corte, em junho de 2009, sendo as concentrações (sem folhas, na dose 0 testemunha); folhas secas, na dose de 5 t de matéria seca ha-1; folhas verdes, na dose de 10 t de matéria seca ha-1; e mistura de folhas verdes mais folhas secas, na dose de 15 t de matéria seca ha-1. A unidade experimental (parcela) foi composta de cinco linhas com cinco metros de comprimento, sendo o espaçamento de 1,5 m (área de 37,5 m2). O experimento foi implantado no Campus II da UNOESTE, sendo que o solo do experimento foi caracterizado como Argissolo Vermelho-Amarelo Distroférrico, típico A moderado, textura médio-argilosa (Embrapa, 1999). O clima da região se classifica em Aw, sendo a estação chuvosa no verão e estação seca no inverno. O cultivar utilizado foi o RB 86 7515 plantado em dezembro de 2007 e colhido em junho 2009 (18 meses), a soqueira deste cultivar foi utilizada no presente estudo, o delineamento experimental utilizado foi o fatorial em parcelas subdivididas (2x4), sendo dois os sistemas de plantios utilizados, em 2007 quando do processo de instalação da cultura, quatro doses do polímero hidroabsorventes e quatro tratamentos com cobertura vegetal. Foram avaliados no experimento o poder calorífico superior da cana-de-açúcar nos meses de agosto, setembro e outubro de 2010, além da produtividade de biomassa, níveis de ATR e Fibra da cana-de-açúcar do mês de agosto e poder calorífico superior do palhiço no mês de outubro de 2010. Todos os dados foram submetidos à análise de variância (ANOVA, p<0,05) e ao teste de comparação de médias Scott-Knott (p<0,05) segundo Gomes (1990) e para a confecção dos gráficos e regressões estatísticas foi utilizado o programa matemático Microcal Origin 6.0. Os resultados obtidos demonstram que os sistemas de plantio leira e sulco não promoveram diferenças entre si, quando comparados em relação às variáveis analisadas no experimento. A utilização de polímero na dose de 53,33 kg ha-1 proporcionou uma maior produção de biomassa e bioenergia do sistema por hectare.

Plasma gasification experiments were conducted on sucrose and crushed macadamia nutshells. The pilot-scale plasma gasification system used comprises a 15 kW DC plasma torch fitted to a 5 L gasification reactor. The DC plasma torch has an efficiency of ~30 % with most of the energy lost in the torch anode. For the macadamia nutshells, the plasma input-power was set at 9, 11 and 14 kW. At each power input setting, four different feed rates were investigated, namely 0.5, 0.7, 1.04 and 1.14 kg/h. It was observed that as the power increases, conversion increases from 48 % at 9 kW to higher than 80 % at 14 kW. It was also observed that higher mass feed rates increase the conversion. The lower heating values of the syngas produced during gasification increased with higher power inputs and higher feed rates. At a feed rate of 1 kg/h, the maximum calorific power value was 3.45 kW, at a torch setting of 14 kW. The highest power values obtained was slightly more than 4 kW. The effect of equivalence ratio (ER) was evaluated on the plasma gasification of sucrose. ER values of 1 and 2 were investigated. With an ER of 1, the CO/H2 ratio was 1.8 and the CO/CO2 ratio was 109. With an ER of 2, the CO/H2 ratio was 1.73, and the CO/CO2 ratio 18. As expected, an increase in ER enhances the formation of CO2. A low ER thus results in higher syngas quality. At equivalent conditions the homogenous, crystalline sucrose yielded a CO/CO2 ratio of 109, significantly higher than the 29 for plasma gasification of the macadamia nut shells. A contributing factor to having better quality syngas, was the smaller the average particle diameter of the sucrose, 0.4 mm, compared to the 10 mm of the crushed macadamia nut shells was. Another contributing factor could be that the available carbon in the macadamia nut shells structure are more strongly bonded than in sucrose. For additional insight, kinetic data for the pyrolysis of sucrose, fructose and glucose were obtained using a TGA-FTIR hyphenated system, at much lower heating rates than anticipated in plasma system, and TGA-DTG experiments on macadamia nut shells. Dynamic studies were performed on sucrose, fructose and glucose at heating rates of 5, 10, 15, 20 and 50 °C/min in an atmosphere of nitrogen flowing at 50 mL/min, and for the macadamia shell at heating rates of 5, 10 and 20 °C/min in an atmosphere of nitrogen flowing at 50 mL/min. The sugars yielded 80 % to 85 % conversion into gaseous products, while the conversion of the shells approached 90 %; the residue was biochar. The FTIR spectra showed the major products that form from the pyrolysis of sugars to be CO2, H2O, along with large quantities C-H-O-containing compounds, amongst them C5H4O2 and C6H6O3. The latter two compounds are probably condensible. / Dissertation (MEng)--University of Pretoria, 2020. / Chemical Engineering / MEng / Unrestricted

The waste treatment, particularly the thermal treatment of waste has changed fundamentally in the last 20 years, i.e. from facilities solely dedicated to the thermal treatment of waste to facilities, which in addition to that ensure the safe plant operation and fulfill very ambitious criteria regarding emission reduction, resource recovery and energy efficiency as well. Therefore this contributes to the economic use of raw materials and due to the energy recovered from waste also to the energy provision. The development described had the consequence that waste and solid recovered fuels (SRF) has to be evaluated based on fuel criteria as well. Fossil fuels – coal, crude oil, natural gas etc. have been extensively investigated due to their application in plants for energy conversion and also due to their use in the primary industry. Thereby depending on the respective processes, criteria on fuel technical properties can be derived. The methods for engineering analysis of regular fuels (fossil fuels) can be transferred only partially to SRF. For this reason methods are being developed or adapted to current analytical methods for the characterization of SRF. In this paper the possibilities of the energetic utilization of SRF and the characterization of SRF before and during the energetic utilization will be discussed.

Electrolyte and pyrotechnic pellets are two important components of thermal batteries. Both electrolyte and pyrotechnic pellets are produced by cold compaction of constituent powders. These compacts are integrated in the battery as pellets with sufficient green density, green strength, calorific energy and burning rate (for pyrotechnic only) to provide high performance batteries. In this study, effects of physical properties of the used powders such as particle size distribution, average particle size, particle shape and composition of components and applied compression pressure and their interactions on green density and green strength of electrolyte pellets and in addition, calorific energy and burning rate of pyrotechnic pellets were examined. Statistical experimental designs were constructed to investigate the main and interaction effects of studied variables. 24 two factorial statistically designed experiments&rsquo / results for pyrotechnic pellets exhibited that the compression pressure and iron powder morphology were the most significant factors improving green density and break strength of pyrotechnic pellets. It was shown that the compression pressure had a negative effect on burning rate. Both calorific output and burning rate were increased significantly by increasing KClO4 fraction. In addition, decreasing particle size of KClO4 had also a positive effect on burning rate. The maximum calorific output was obtained at maximum KClO4 fraction. 23 two factorial statistically designed green strength and green density experiments&rsquo / results of electrolyte pellets revealed that, compression pressure was again the dominating factor. Moreover, there was a tendency for higher green density with lower MgO fraction and electrolyte powder average particle size. Besides, the positive effect of decreasing average particle size on green strength was investigated distinctly at low green density values. From the thermal battery perspective, main and interaction effects of variables on the characteristics of electrolyte and pyrotechnic pellets were successfully examined.

Šiame darbe pateikti kuro kaloringumo priklausomybės nuo drėgmės skaičiavimai. Atlikus bandymus, nustatyta katilo nominali ir minimali galia. Skaičiuojant tiesioginiu ir netiesioginiu metodu nustatytas katilo naudingumo keficientas. Atlikta katilo korpuso įtempimo būvio analizė. Buvo skaičiuojama katilo šiluminė varža, pateikti pasiūlymai katilo techninių parametrų gerinimui. / This paper presents the dependence on fuel moisture calorie calculations, tests the boiler nominal and minimum power. Calculation of direct and indirect method keficientas the boiler. Boiler body made of life stress analysis. The calculated resistance of the boiler įiluminė, proposals to improve technical parameters of the boiler.

Sri Lanka is an island at the Indian Ocean with 65234 km2 and it has a power demand of 2000 MW. The hydro power was the main power source before year 2000, after maximum usage of hydro power Sri Lanka installed fossil fuel power plant to achieve the demand. Then the electricity price gradually increased due to higher increment of fuel price. As the solution for this higher price of electricity the government has to go to new profitable power source the coal power. Finally year 2011 Puttalam coal power plant 300 MW x 1 was installed with the hope of providing the low cost reliable energy supply to Sri Lanka and it will be extended to 300MW x 3 plan in year 2015. Therefore the puttalam coal power plant is the key power plant to the Sri Lankan power generation and it is expected to have the maximum output (base load) to the Power demand of Sri Lanka. Sri Lanka is a tropical country and it has two different weather seasons as rainy season and dry season. The puttalam power plant situated at Kalpitiya peninsula and it has normally dry weather condition, Months of April, October November and December have heavy rain condition (Meteorological Department, Sri Lanka, 2012). The puttalam coal power plant may not achieve full load because of high moisture content at rainy season. So this Thesis carried out to find the capability to achieve the full load with available plant, plant capacity by using different coal qualities. Then find the economical benefits and effect on the environment with the recommended coal for different seasons and also design a storage plan to coal storage at existing coal yard. Based on the historical data and the Meteorological department rain fall data and by doing a technical analysis the recommended coal type was selected and the capability of plant equipment capacity to the recommended coal to achieve the full load was analyzed. Then the coal storage plan was designed according to annual requirement of the different recommended coal and economical benefit was analyzed by considering last year cost for generated power and the generation cost, if recommended coal is used for last year. Finally flue gas analysis was carried out for the recommended coal to find the effect on the environment. The recommended coal for rainy season is with the heating value of 6600 kcal/kg and for dry season it is 6300 kcal/kg. The capacities of main boiler and other plant equipments are capable for the recommended coal to achieve the full load of the plant. Then the design of the coal storage plan was given under figure 4.2 and table 4.1. It was calculated that a profit of 3.932 million US$ can be achieved by using the recommended  coal for the last year and also when compared with the changing price of oil and coal it will be more profitable for the future. Because the oil price increases very rapidly and the increase in coal price is very low compared to the oil price. Finally the SOx and NOx emissions from recommended coal were analyzed and it was within the environmental limits because of the high quality emission reduction plant equipments.

In a country of vast land area and a large agricultural potential such as Brazil, one of the biggest challenges is to develop arrays of energy from alternative sources of low cost, making them economically competitive. In this situation, several research institutions of the country have struggled to develop new alternatives, and among the various possibilities, we highlight the use of biomass residues for power generation by burning. The Terminalia catappa L. popularly known as walnut is a species adapted to all regions of Brazil, which make it a viable source of biomass. In this study, we evaluated the quality of some parts of the nut for energy purposes. The samples were crushed immediately after being collected and were made the following physico-chemical characterizations: gross calorific value, ash content, moisture and density. The calorific value observed for the species studied had values between 13 643 J / g to 18 842 J / g, especially if Pie castanets due to the higher amounts of available energy both in its fresh form with values of 18 620 J / g or as briquettes with values of 18 842 J / g, values that are considered satisfactory for biomass waste. The ash content of the samples had values between 2.89% to 6.54% for the sample is fresh and in form of briquettes values that are considered acceptable, with no losses of inert material. The humidity of the species studied ranged from 3.76% to 15.01% these results indicate that the sample can be burned without any drying process, promoting greater energy gain for the processes to be employed. The results suggest the potential use of the poles parts of the plant for power generation by burning. In addition, oil is extracted from almonds obtaining a yield of approximately 50% of oil and its properties and potential for the production of biodiesel were evaluated methyl and ethyl. The results showed that biodiesel and methyl ethyl obey the laws of biodiesel production determined by ANP No. 7. / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Num país de imensa extensão territorial e com um grande potencial agrícola como o Brasil, um dos maiores desafios é desenvolver matrizes energéticas a partir de fontes alternativas de baixo custo, tornando-as competitivas economicamente. Diante desta situação, vários órgãos de pesquisa do país têm se esforçado para desenvolver novas alternativas e, entre as diversas possibilidades, destaca-se a utilização de resíduos de biomassa para geração de energia através da queima. A Terminalia Catappa L. conhecida popularmente por castanheira é uma espécie adaptável a todas as regiões do Brasil, o que a tornar uma fonte viável de biomassa. Nesse trabalho, avaliamos a qualidade de algumas partes da castanheira (folha, amêndoa, galho, torta) para fins energéticos tanto na sua forma in natura quanto na forma de briquetes. As amostras foram trituradas logo após serem coletadas e foram realizadas as seguintes caracterizações físico-químicas: poder calorífico superior, teor de cinzas, umidade e densidade. O poder calorífico observado para a espécie estudada apresentou valores entre 13 643 J/g a 18 842 J/g, destacando-se a torta da castanhola por apresentar maiores quantidades de energia disponível tanto na sua forma in natura com valores de 18 620 J/g quanto como briquetes com valores de 18 842 J/g, valores que são considerados satisfatórios para biomassas residuais. O teor de cinzas das amostras apresentou valores entre 2,89 % a 6,54 % seja para amostra in natura quanto na forma de briquetes valores que são considerados aceitáveis, não havendo perdas consideráveis de material inerte. A umidade das espécies analisadas variou entre 3,76 % a 15,01 % esses resultados indicam que a amostra pode ser queimada sem necessidade de nenhum processo de secagem, promovendo maior ganho energético para os processos a ser empregado. Os resultados sugerem a potencialidade do uso das varias partes da planta para geração de energia, através da queima. Complementarmente, óleo foi extraído das amêndoas obtendo-se um rendimento de aproximadamente 50 % de óleo e suas propriedades e potencialidade para a produção de biodiesel metílico e etílico foram avaliados. Os resultados demonstraram que o biodiesel etílico e metílico obedece às leis de produção de biodiesel determinado pela ANP N° 7.

This thesis deals with combustion of lignocelluloses biomass with comparison to cellulose-lignin biomass and with appropriateness of different combustion technologies in the context of the impact on the environment. Furthermore, the thesis deals with content of the heating value in the individual fuels. The heating value capacity was measured experimentally in different kinds of biomass by method of dry distillation and these results were statistically evaluated and and discussed with the findings taken from literature. On the basis of literature data, differences have been discovered in lignocelluloses fuels in terms of calorific value and heating value, calorific values were in average from 15,3 MJ/kg to 16,8 MJ/kg and heating values were 17,5 18,1 MJ/kg. While in cellulose-lignin fuels these differences are not that big and are within values of 19,5 MJ/kg for heating value and an average calorific value is around 18,4 MJ/kg. Measuring of the content of tar and other residual fluid fractions in five the most commonly used bio-fuels from agricultural production (wheat straw, rape straw, hay, energy crops, digestate from biogas station). After statistical evaluation of data, it revealed the difference in content of tar between the wheat straw and digestate (P 0,05; on average 40,48 % for wheat straw and 29,58 % for digestate).

Submitted by (lucia.rodrigues@ufrpe.br) on 2016-08-23T13:36:09Z No. of bitstreams: 1 Arlindo de Paula Machado Neto.pdf: 3327678 bytes, checksum: e69cc803a90b1753430b0c97ed2acaa4 (MD5) / Made available in DSpace on 2016-08-23T13:36:10Z (GMT). No. of bitstreams: 1 Arlindo de Paula Machado Neto.pdf: 3327678 bytes, checksum: e69cc803a90b1753430b0c97ed2acaa4 (MD5) Previous issue date: 2013-02-06 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / In this paper we analyzed the parameters related to the climate and vegetation in an area, inserted in Caatinga, in the municipality of Coremas, Paraiba and an area of Cerrado, in Barreiras in Bahia, with the aim of supporting monitoring and prevention forest fires under transmission line belonging to CHESF energy and protection to vegetation areas included in the two biomes studied. For each type of vegetation were launched 10 plots of 10 x 25 m (250 m²) spaced 25 m from each other, totaling an area of study of twenty plots (0.5 ha). Within the plots were numbered, analyzed and identified all individuals with CAP ≥ 10 cm in the two biomes. Were performed in the phytosociological study, quantification of biomass, soil, the wood density, determining the calorific value of the species, in addition to monitoring of meteorological data in order to develop indices of danger by Formula Monte Alegre. Phytosociology was performed based on the following parameters: absolute and relative density, absolute and relative frequency, absolute and relative dominance, importance value and coverage amount. In the phytosociological Caatinga area of individual trees were found 382, 1528 individuals per hectare, and the Croton species argirophylloides showed the highest density parameter related to absolute (664 trees per hectare) to indicate the abundance of the same area . In the Cerrado phytosociological survey indicated the presence of 258 individual trees, 1032 trees per hectare, especially in terms of absolute density species Indigofera suffruticosa (136 individuals per hectare). Quantification of biomass of six species showing the largest absolute density in the area of Caatinga was 8.72 t / ha of biomass and an average of 2.18 t / ha of litter. In the area of Cerrado these values were 1.99 t / ha of biomass and 1.36 t / ha of litter. The most basic density was found for species with Poincianella bracteosa 1.107 g/cm3 in the area of Caatinga and Cerrado Sclerolobium paniculatum with 0.674 g/cm3. The average calorific value of the six species found in the area of Caatinga was situated in 4206.25 kcal.kg-1 and the Cerrado area, the average calorific value was 5044.99 kcal.kg-1. Meteorological data indicated the highest levels of fire danger in the months between June and November in the area of Caatinga and Cerrado May to October. The two areas did not show amounts of biomass that could result in large fires, but it is necessary to more detailed studies regarding fire in both areas, as well as a monitoring of species had a higher biomass contribution site. / Neste trabalho foram analisados os parâmetros relacionados à vegetação e ao clima em uma área, inserida no bioma Caatinga, no município de Coremas, na Paraíba e uma área de Cerrado, no município de Barreiras na Bahia, com objetivo de subsidiar o acompanhamento e a prevenção de incêndios florestais sob linha de transmissão de energia pertencente à CHESF e proteção à vegetação das áreas inseridas nos dois biomas estudados. Para cada tipo de vegetação foram lançadas 10 parcelas de 10 x 25 m (250 m²) distanciadas 25 m uma das outras, totalizando uma área de estudo de vinte parcelas (0,5 ha). Dentro das parcelas foram numerados, analisados e identificados todos os indivíduos com CAP ≥ 10 cm nos dois biomas. Foram realizados no estudo o levantamento fitossociológico, a quantificação de biomassa aérea, de solo, a densidade básica da madeira, a determinação do poder calorífico das espécies, além do monitoramento de dados meteorológicos visando a elaboração dos índices de perigo pela Fórmula de Monte Alegre. A fitossociologia foi realizada a partir dos seguintes parâmetros: Densidade absoluta e relativa, freqüência absoluta e relativa, dominância absoluta e relativa, valor de importância e valor de cobertura. No levantamento fitossociológico na área de Caatinga foram encontrados 382 indivíduos arbóreos, 1528 indivíduos por hectare, sendo que a espécie Croton argirophylloides apresentou o maior valor relacionado ao parâmetro de densidade absoluta (664 indivíduos por hectare), indicando assim a grande abundância da mesma na área. No Cerrado o levantamento fitossociológico indicou a presença de 258 indivíduos arbóreos, 1032 indivíduos por hectare, destacando-se em termos de densidade absoluta a espécie Indigofera suffruticosa (136 indivíduos por hectare). A quantificação da biomassa das seis espécies que apresentaram os maiores valores de densidade absoluta na área de Caatinga foi de 8,72 t/ha de biomassa aérea e uma média de 2,18 t/ha de serrapilheira. Na área de Cerrado esses valores foram de 1,99 t/ha de biomassa aérea e 1,36 t/ha de serrapilheira. A maior densidade básica foi encontrada para espécie Poincianella bracteosa com 1,107 g/cm3 na área de Caatinga e Sclerolobium paniculatum no Cerrado com 0,674 g/cm3. O poder calorífico médio das seis espécies encontradas, na área de Caatinga ficou situado em 4.206,25 kcal.kg-1 e na área de Cerrado, a média do poder calorífico foi de 5.044,99 kcal.kg-1. Os dados meteorológicos indicaram os maiores índices de perigo de incêndios nos meses compreendidos entre junho e novembro na área de Caatinga e maio à outubro no Cerrado. As duas áreas não apresentaram quantidades de biomassa, que pudessem ocasionar em incêndios de grandes proporções, porém se faz necessário estudos mais detalhados em relação aos incêndios nas duas áreas, bem como um monitoramento das espécies que obtiveram uma maior contribuição de biomassa local.