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Apparent Kinetic Study of Woods Pyrolysis and Combustion

Author: LiYingXu
Tutor: FangMengXiang；NiMingJiang；LuoZhongZuo
School: Zhejiang University
Course: Thermal Power Engineering
Keywords: Fire Combustible Fiber material Pyrolysis Combustion Apparent thermal gravimetric Apparent kinetic Oxygen concentration TG-FTIR Activation energy
CLC: X928.7
Type: Master's thesis
Year: 2005
Downloads: 186
Quote: 8
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Abstract


Combustible pyrolysis pilot process of the fire incident, an important factor to cause subsequent smoldering ignition, combustion and flame spread phenomenon. Therefore, the study combustible pyrolysis is very important. Pyrolysis of the long-term goal is to master the pyrolysis mechanism, quantitative study of the parameters to control the rate of pyrolysis, and as much as possible about the composition of the pyrolysis products. First the fire combustible pyrolysis Research apparent test and model the dynamics. As the combustible pyrolysis process under a nitrogen atmosphere, while the oxygen concentration in the actual fire in space and time are variables, in order to more reliably reflects the actual situation, the targeted research fire varying oxygen concentration environment pyrolysis and combustion of combustible under apparent dynamics, including pilot studies and model studies. And also to explore the mechanism of pyrolysis and combustion of combustible materials. In this paper, the TG-FTIR associated with research a variety of fiber material TGA apparent kinetic characteristics, qualitative analysis of the pyrolysis and combustion gas product ingredients. Apparent TGA results show that the nitrogen timber performance for single-stage weightlessness, air and carbon dioxide atmosphere the dual stage weightlessness; With the apparent increase in the oxygen concentration of wood and its components TG weight loss and weight loss rate gradually increased; energy supply, the volatile diffusion and apparent kinetic three fronts oxygen concentration affect the apparent thermal mechanism of weightlessness. Studies have shown that infrared pyrolysis and combustion gas composition: hardwood nitrogen pyrolysis products are similar, including CO 2 , CO, H 2 O, CH 4 , acetate (CH 3 COOH), etc.; With the increase of oxygen concentration, hardwood heat decomposition gas product CO 2 and CO peak height of the relative ratio of the increase , simultaneously CO the 2 CH 4 , the acetate relative peak height is also increasing, which reflects the effect of the combustion process of pyrolysis and pyrolysis products ingredients. The pyrolysis and combustion of wood and wood char is apparent kinetic model proposed semi-global phased apparent kinetic model. Pyrolysis under a nitrogen atmosphere using a model of the single stage, under an atmosphere of air and carbon dioxide using a double stage a model for solving the apparent kinetic parameters of the timber. The apparent kinetic model and the first in-depth study of pyrolysis and combustion of wood under the conditions of different oxygen concentration, will receive the high linear correlation coefficient, indicating that the theoretical model can better describe the apparent kinetics of pyrolysis and combustion characteristics . The apparent activation energy of pyrolysis and combustion of wood and semi-coke combustion model study found a linear relationship with the oxygen concentration and mechanism analysis.

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CLC: > Environmental science, safety science > Safety Science > Safety management (labor protection and management ) > Accident investigation and analysis ( work-related injuries and prevention ) > Fire and explosion
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