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Experimental Study on Co-pyrolysis of Biomass and Coal

Author: ChenYinYing
Tutor: YanWeiPing
School: North China Electric Power University (Hebei)
Course: Thermal Power Engineering
Keywords: biomass coal co-pyrolysis experiment exergy efficiency slagging index
CLC: TK227.1
Type: PhD thesis
Year: 2007
Downloads: 1007
Quote: 10
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Abstract


With the shortage of fossil fuels and severe environmental pollution, biomass, as a clean, storable and transmittable renewable energy resource, has been attached to great attention around the world.Thirteen commonly available kinds of biomass, biomass mixtures, and three kinds of the different rank of coal were selected in present study. A thermogravimetric analyzer and a packed-bed pyrolyser designed were used in the experiment to study the pyrolysis characteristics. The exergy efficiency of combustion chamber was assessed by exergy analysis. The slagging performance of coals and biomasses was investigated in detail.The thermogravimetric analyzer was used to get the pyrolysis and the co-pyrolysis performance of biomass, biomass mixtures and three kinds of coal, as well as the mixtures of biomass and coal with various proportions. The initial temperature of coal volatile release in the co-pyrolysis process was reasonably defined. The results show that both the initial temperature and the terminal temperature of coal volatile release in the co-pyrolysis process are dependent of blending ratio as well as the rank of coal.And more or less variations of the temperatures are found by comparing with the individual pyrolysis performance of the biomass mixture and each coal. The facilitation, inhibition and interaction effects in the co-pyrolysis of biomass and coal were studied. Kinetic model of co-pyrolysis was erected. The release of N and S of thirteen kinds of biomass was explored in the process of pyrolysis using a thermogravimetric analyzer and element analyzer.Major components of the gas derived from the pyrolysis of biomass and coals pyrolysis were analyzed by gas chromatographic analysis using the packed-bed pyrolyser. This thesis discussed the components and their calorific values of the gas, the pyrolysis characteristics and product distribution of samples, such as the mixtures of biomass and coal. Investigation of gas product the percentage in various temperature range of pyrolysis was conducted. The co-pyrolysis property of the same blending ratio of biomass and coal under the different heating rates was assessed. Pyrolysis process parameters were also calculated and investigated.The experiment results obtained by the thermogravimetric analyzer and the packed-bed pyrolyser indicate that interaction effects exist in the co-pyrolysis of biomass and coal and the thirteen kinds of biomasses keep their own pyrolysis characteristics in the biomass mixture co-pyrolysis.The exergy efficiency of adiabatic combustion chamber was investigated for different proportions of fuel components, such as biomass gas, coal gas and different ratio mixture of biomass and coal gas. The exergy efficiency of biomass pyrolysis gas is higher than that of coal gas, but lower than that of coal pyrolysis gas. The relative content of fuel components played more important part in exergy efficiency than the calorific value of fuel. The exergy efficiency of the same content CO of fuels is higher than CH4.Combining to the theory of a large coal-fired boiler blended heavy slagging coals with engineering practice, the slagging performance of coals and biomasses is investigated in the thesis. Compared with coals, biomass tands to be slagging heavily.

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