Study On The Characteristics Of Pyrolysis Corn Stalk By TG-FTIR

Biomass energy is the most common form of renewable energy that can be utilized to reduce impact of energy production and use on the global environment. Biomass, mainly referring to corn stalk, agricultural residue and firewood, has its typical feature for substituted energy production. Its utilization is an effective way to solve the increasing problem caused by energy shortage and to improve environmental protection. One important way is to convert the biomass energy thermally, in which pyrolysis is regarded as a significant technology because it acts not only as an essential step in biomass gasification and combustion, but also as an independent technology resulting in high energy density products.The pyrolysis of four typical biomass (corn stalk, corn brack, corn bract, flake corn stalk) and copyrolysis of corn stalk–corn brack were analyzed on TG-FTIR system, the process of biomass pyrolysis were studied. Experimental results show that TG and DTG curves all moved to higher temperature ranges with increasing heating rate. And the most rate of weight loss is decreasing, which of temperature corresponding with is also increases and the final loss weight increases . As the ratio of corn stalk in the mixtures of corn stalk and corn brackis greater 50%, the effect of corn brack on total characteristic pyrolysis is little,and little synergetic effect was found.The components of pyrolysis gas production were tested with a Fourier Transform Infrared spectrometry (FTIR). And the wave numbers of gas (CO2,CO,CH4,H2O) were also comfirmed. A detailed analysis was made about the releasing of major volatiles during pyrolysis process.Pyrolysis kinetic study of four samples of biomass was done on date of experiment. Nine typical functions was simulated with the method of Li Chung-Hsiung, compared their correlation coefficient and standard deviation,finally, confirmed the furthest capable function with the method of Malek. Result showed the model F1, R2, F1, F1could describe thetwo phase. According to TG data, activation energies for pyrolysis of four samples were calculated by Coats-Redfern method. It indicates that activation energy increases with the increase of heating rate. Based on the assumption that three main components in biomass underwent individual thermo-degradation, a multi-component kinetic model was developed. The parameters in the model were obtained from thermo-gravimetric analysis of the four samples of biomass (corn stalk, corn brack, corn bract, flake corn stalk), which were well accordance with experimental results. It was confirmed that the thermal progress were related to the progressive changes of the chemical content of the corn stalk.