| As a high-quality biomass, bamboo shoot shell highly contains cellulose and lignin. Bio-oil from fast pyrolysis of bamboo shoot shell in the fluidized bed has important environmental, economic and social benefits. This paper analyzed TG of the bamboo shoot shell, studied process of fast pyrolysis in the fluidized bed, analyzed the quality of the bio-oil, measured and studied the adsorption properties of solid product.1. Analyzed TG, infrared spectroscopy and kinetic analysis of the mao bamboo shoot shell, achieved the reaction of thermal decomposition process and kinetic parameters of activation energy. The experimental results showed that bamboo shell infrared absorption spectra mainly included alkyl, carbon-based, carbohydrate and absorption bands, the composition of benzene and so on. Bamboo shell pyrolysis TG curve was divided into four phases, such as dehydration, warm-up solution, pyrolysis (severe weight loss), carbonization (slow weight loss). Reaction stage mainly concentrated in about 250～650℃. The speed of bamboo shell pyrolysis depended on the relationship between raw materials size and heating rate. By using Doyle activation energy of bamboo shoot shell in different heating rates was calculated which were 120～160kJ/mol. Using the kinetic compensation, the corresponding kinetic parameters were obtained and pyrolysis kinetic equation of bamboo shell was determined. It was considered that the reaction mechanism could be better described by a reaction model.2. Pyrolysis experiment with the bamboo shoot shell was carried out in the self-designed fluidized bed in which quartz sand was as the fluidizing medium. The effect of bio-oil yield on pyrolysis temperature, material size, feeding rate, retention time and different additives were studied. The best process conditions of fast pyrolysis were explored. The results showed that the best conditions were additive KNO3, temperature 460℃, material size below 0.6mm, the feeding speed 50g/min, retention time 0.8s, the concentration of additive 0.4% and that bio-oil maximum yield could be 59.3%.3. Used infrared spectroscopy and GC-MS analysis, elements composition and major compositions of bio-oil, chemical and physical properties of the bio-oil were measured. The experimental results showed that the performance of bio-oil was some different from boiler fuel and the calorific value was much lower than the boiler fuel. If bio-oil was used as fuel, it needed to be refined. According to the results of infrared spectroscopy and GC-MS analysis, the bio-oil composition was very complex. There were 38 kinds of recognizable compounds in the bio-oil from the bamboo shell which added additive KNO3. Bio-oil mainly contained organic acids, hydrocarbons, phenols, benzene compounds and so on. The oxygen content of the bio-oil was relatively high, reaching 38.5%, so it could not be directly used for fuel. Due to relatively high content of phenolic compounds, up to 60%, the bio-oil could be used to process the adhesive system.4. Physical properties and adsorption performance of the solid thermal decomposition product from bamboo shoot shell were measured. Using infrared spectroscopy, the functional groups of the solid pyrolysis product were analyzed. Single factor and a orthogonal design were designed to explore the best technology parameters of solid pyrolysis product adsorption polluted matter in sewage. The experimental results showed that the order of the various factors effects on the adsorption rate was adsorption time, the amount of solid products, pH value, CODcr. The best technology level was pH value 6, CODcr of sewage 2307mg/L, solid product 0.6g, adsorption time 60min, the best adsorption rate of CODcr of sewage was 39.23%. |
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