Experimental Research On Pyrolysis Carbonization Characteristics Of Wood And Corn Stalks

Biomass briquettes are used widely in China currently. To impel the process of biomass energy utilization in China, it’s of significance to develop varieties of forms for biomass briquette. The biomass pyrolysis and carbonization technology, a low simple technology with a low investment, is applicable in the rural areas. Poplar, pine and corn straw briquette are used in the pyrolysis carbonization experiments, to provide theoretical guidance for the development of the biomass carbonization devices.Thermogravimetric analysis was used to study paralysis characteristics of poplar, pine wood and corn stalks in different pyrolysis atmospheres. The corresponding kinetic parameters was obtained and the weight loss model in air atmosphere was established. Experimental results indicate that the pyrolysis characteristics of three biomass in air and nitrogen are not exactly the same. All the TG curves show three different stages. The DTG curves have two obvious weight loss peaks in air atmosphere and a weight loss peak in nitrogen atmosphere. It’s observed from TG and DTG curves that the pyrolysis process will be accelerated greatly when adding appropriate oxygen without considering the pyrolysis products. The whole pyrolysis process of poplar and pine are endothermic. Although the pyrolysis process of the corn stalk is exothermic from350℃to480℃, it is endothermic process in the other interval of the temperature. Caloric requirements for elementary pyrolysis are60.96kJ/kg,59.73kJ/kg and34.86kJ/kg for poplar, pine and corn stalks respectively. In nitrogen atmosphere, the activation energy of corn stalk is the largest, followed by poplar, and the pine is lowest. The calculation results of the Two-component model is coincided with experimental results.The biomass carbonization feedstock selection criteria was discussed, In the perspective of both theoretical and experimental. The effects of pyrolysis temperature and pyrolysis atmosphere on biomass pyrolysis carbonization characteristics were researched using self-built test bench. Experimental results show that lignocellulosic biomass charcoal yield and quality is higher than straw biomass, and it is more suitable as carbonized material. As pyrolysis temperature increasing, two biomass all become darker. As the temperature increasing, the productivity of solid products of two biomass are reduced both in air and nitrogen atmospheres. Volatile matter content decreases gradually, while the ash content and fixed carbon content increase. As temperature increases, calorific value of pine and corn stalks increase first, and then decreases in both air and nitrogen atmosphere. The energy retention decreases gradually.