| As a green, clean and renewable energy,Biomass energy has important significance to solve the energy crisis and environmental issues. Biomass pyrolysis can be converted to carbon, bio-oil and gas, and it is an important method to improve biomass utilization. The condensation temperature of pyrolysis volatiles has a very important influence on the yield, components and quality of bio oil. Bio-oil was segregated roughly in the process of condensation by self-designed condenser. Physical and chemical properties, combustion characteristics and composition of bio-oil was analyzed. The results appear as followed.Yield of bio-oil of multi-stage condensate experiments and the proportion of each group of bio-oil were analyzed. The results show that the total yield of camellia oleifera shells and rice husk bio oil are equal to about 30%. Bio oil of two material collected in glass condenser was the largest, more than 80%, but the vast majorityof thoseis wood vinegar liquid, and filter oil collected biological ranked second. In the first four condensers, the third condenser collected bio-oil was the largest, and there was no significant difference among the other three condensers.Physical and chemical properties of bio-oil were analyzed. The results showed that heat value of rice husk bio-oil is higher than camellia oleiferashells bio-oil. Andrade equation, power equation and Vogel equation were established the forecast model of bio-oil viscosity change with temperature, while Vogel equation is more suitable as a biological oil viscosity temperature model. The influence of temperature on the rate of change of the bio oil viscosity was to explore by the differential curve of the Vogel equation. The results show that the higher bio-oil viscosity and the lower the temperature, the viscosity is more sensitive to the environment temperature in the limited range of temperature. The descent speed of bio oil viscosity decreased with the temperature, and the descent speed of camellia oleifera shells bio-oil viscosity is affected by temperature greater at lower temperatures.Thecombustion process and combustion properties of bio-oil were analyzed by thermal gravimetric analysis. In the four stages of combustion process, mass loss of the third stage was smallest. The morelight components was in bio-oil, the mass loss of the first stage was the greater, and the mass loss of the fourth stage was smaller. Ignition characteristics, burnout characteristics and synthetic combustion characteristics of the fifth and sixth bio-oil were worst. Ignition characteristics, burnout characteristics and synthetic combustion characteristics of the forth bio-oil was worse in the first four groups. three parameters of the first and third were better.Each group of camellia oleifera shells bio-oil were tested by GC-MS, and bio-oil components were analyzed. The results showed that the composition of the component became more simple with the decreasing of condensing temperature. Components of carbon atom number more than 10 were condensed mainly above 165?. Phenolic compounds of bio-oil were higher, with the condensing temperature decreasing, the proportion of phenolic compounds is reduced. The average molecular weight and the average boiling point of bio-oil decreased as condensate temperature decreasing. Although the composition of the component of some bio-oil degree of coincidence was higher, and their average molecular weight and boiling point average were more similar, physical and chemical properties were quite different. |
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