Dissertation > Excellent graduate degree dissertation topics show

Fast Co-pyrolysis of Coal and Biomass in a Free Fall Reactor

Author: ZhuXiangWei
Tutor: XuShaoPing
School: Dalian University of Technology
Course: Chemical processes
Keywords: Biomass Coal Co-Pyrolysis Synergy Tar
CLC: TQ530.2
Type: Master's thesis
Year: 2010
Downloads: 180
Quote: 5
Read: Download Dissertation

Abstract


Fast pyrolysis and co-pyrolysis of pine sawdust and sub-bituminous coal were conducted in a free fall reactor under nitrogen atmosphere. The pyrolytic characteristic of individual fuel at different temperature ranged from 500℃to 800℃was investigated. The characteristic of the co-pyrolysis of pine sawdust and sub-bituminous coal was also studied in the blending ratio from 0.25 to 0.75 and at temperature between 600℃and 800℃. Attentions were paid on the synergy in the process of co-pyrolysis. Some interesting conclusions were came to through comparing the changes of product distribution and gas composition of pyrolysis and co-pyrolysis. There are some differences between the pyrolytic characteristic of pine sawdust and sub-bituminous. It makes synergy in the co-pyrolysis possible that large amount of hydrogen and methane has been produced in the process of pine sawdust pyrolysis. The results also demonstrated that there is synergy in the co-pyrolysis of pine sawdust and sub-bituminous coal, which could be seen in the increase of liquid product. The gas composition of co-pyrolysis changed noticeably compared to the pyrolysis of individual fuel. The synergy of co-pyrolysis was exhibited more evidently at a higher pine sawdust blending ratio and a lower pyrolysis temperature. The synergy may be attributed to the transfer of hydrogen from biomass to coal.The chemical composition of liquid product from co-pyrolysis was also analyzed. A method based on solvent extraction, chemical treatment and extrography was established for the pre-separation of liquid product, by which the liquid product could be separated into five fractions including water-soluble, acid fraction, aliphatics, aromatics and polar fractions using solvent extraction, chemical treatment and extrography. GC-MS was utilized for quality identification and quantification of compounds in each fraction. The composition of liquid product is complicated and 86 kinds of compound has been identified. Most of these compounds exist in the aliphatics fraction including 52 kinds of hydrocarbon and oxygen-containing heterocyclic compound. There is a large amount of phenolic compounds in the acid fraction. The aromatics fraction is composed of decahydronaphthalene and aromatics hydrocarbon such as naphthalene and biphenylene. Only few of compounds has been identified in the water-soluble and polar fractions.

Related Dissertations

  1. The Design and Experimental Rearch of Disposable Catalyzer in the Process of Coal Liquefaction,TQ529.1
  2. The Realization of Coal Liquefaction in the Continum Model System and the Experimental Research of Coal Liquefaction,TQ529.1
  3. Study of Method and Facilities for Transfering from Hot Air to Exhaust Air Converying System,TK223.25
  4. Numerical Simulation of Biomass Direct Reburning,TK16
  5. Experimentation Research for Deoxidize Reaction Process of NO_X Adopt Different Reburnning Fuels,TK227.1
  6. Study of Updraft Biomass Air Gasification and Tar-Reducing Technology,TK6
  7. Preparation of the Crop Stalk-Based Shaped Activated Carbons and Fibreboard,X712
  8. Domestication of Acidithiobacillus Ferroxidans and Its Application to Bio-desulfuration of Coal,X701.3
  9. Study on Biomass Energy Production Utilization Model Based on Circular Economy,S216
  10. Study of "Solid -air - Liquid" Cogeneration and Product Application in Biomass Energy Conversion Process,S216
  11. Engineering Design on the Treatment and Reuse of Coal Mine Drainage,X752
  12. Environmental Effects of Poisonous and Harmful Substances in the Typical Industrial Solid Wastes,X705
  13. The Feature of Sediment Yield and Hydrodynamics of Different Underlying Surfaces in the Construction of the Shenfu-dongsheng Coal Field,S157.1
  14. Heze coal gas reservoir sedimentology,P618.13
  15. Coal-bearing strata of free gas accumulation Mechanism and Pattern,P618.13
  16. Tianyuan Chemical Company Development Strategy,F426.72
  17. Environmental Responsibility in coal zone,D922.68
  18. Shandong Province, the existing features and coalbed methane resource evaluation,P618.13
  19. Coal miners and practice unsafe behavior measurement,X936
  20. Coal mining impacts on groundwater numerical simulation,TD741
  21. The Performance Research of Coal-based SOFC/IGCC Combined Cycle Power Generation System,TM611.3

CLC: > Industrial Technology > Chemical Industry > Processing and utilization of coal chemical and coal > Basic theory of the coal chemical > Coal pyrolysis and conversion
© 2012 www.DissertationTopic.Net  Mobile