Dissertation > Agricultural Sciences > Agricultural Engineering > Agricultural power,rural energy > Application of bio-energy ( biomass)

Study on Thermal Kinetics Characteristics of Biomass Tar and Its Distillations

Author LiJiHong
Tutor ZhangQuanGuo
School Henan Agricultural University
Course Agricultural Biological Environmental and Energy Engineering
Keywords Biomass tar Fraction Thermodynamic properties Chemical composition
CLC S216
Type Master's thesis
Year 2005
Downloads 323
Quotes 5
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In this study, in order to protect the environment, the development of biomass energy utilization technologies background, using heated distillation method, depth of biomass tar and its different temperature segment fraction composition and thermal dynamics, biomass tar in the chemical industry and energy The development and utilization of reference. Composition analysis using chromatography - mass spectrometry analysis techniques, the composition of biomass tar and its fractions; thermal dynamics study using integrated thermal analyzer TGA curves by measuring a different atmosphere and a different heating rates, derivative TGA curve and differential thermal curve, the evaporation and combustion characteristics of biomass tar and its fractions qualitative analysis and quantitative solving thermal kinetic parameters. (1) biomass tar presence of high moisture, high oxygen content, high volatile, medium calorific value, the evaporation of water reaches a certain temperature can be ignited, less residual ash after burning low sulfur fuel. But because of its high moisture content and high oxygen content, and the presence of some impurities, the need to be conducted after the purification treatment and modification can be used as a fuel. The chemical composition of biomass tar that its main components are phenols and aromatic hydrocarbons biomass tar will have important guiding significance in the application of the fuel and chemical industrial raw materials. Upper fractions (2) biomass tar below 150 ℃ and 150 ℃ ~ 210 ℃ fraction contains a variety of useful organic compounds content of some of these compounds is obvious, high economic value, the value of the separation and purification. Thermal dynamics show that their properties are close to diesel, high calorific value, density and kinematic viscosity close to or slightly higher than that of No. 0 diesel oil, with oil alternative fuel use value. But their higher flash point than diesel, suitable for diesel engine equipped with pre-combustion device. (3) below 150 ℃ lower biomass tar fraction is the main content of a variety of organic compounds, carboxylic acids and phenols, etc. having higher COMPREHENSIVE potential. Take fuel oil with biomass tar system is not combustible fraction recover useful organic compounds, processing and utilization of wood vinegar avoid causing of biomass tar secondary pollution and waste of resources. (4) the biomass tar fraction above 210 ℃ major component is a higher carbon number of straight-chain alkanes and derivatives thereof, the low oxygen content. It has good combustion properties, but because of its high viscosity, the in in fuel viscosity undemanding burner before can be applied. (5) after distillation, the residual biomass char carbon content is high, low ash content, can be directly used as a solid fuel. Because of its density and the characteristics of the porous, after processing, can serve as a good adsorption material. In order to simplify the operation process, the distillation temperature range can be set to below 150 ℃ and 150 ° C to 210 ° C, the upper and lower fraction can be obtained below 150 ℃, from 150 ° C to 210 ° C fraction and biomass char four products. This test further processing and utilization of living material tar provide the necessary scientific guidance and practical reference value. The paper also recommended to strengthen the collection of biomass tar, management and deep-processing technology research to generate social, economic and environmental benefits of the comprehensive utilization of biomass tar.

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