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Research on High-Temperature Pyrolysis of Biomass-Tar Using Experiment

Author: ZhaoZhiFeng
Tutor: DongPi
School: Harbin Institute of Technology
Course: Thermal Power Engineering
Keywords: rice husk tar thermal gravimetric analysis GC-MS analysis
CLC: TK6
Type: Master's thesis
Year: 2010
Downloads: 89
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Abstract

The problem of removing biomass-tar is the bottleneck of the exploitation of biomass. Among these present processing methods, the pyrolysis-method is the most potential method. It can make biomass-tar crack to produce more syngas and exploit thermal energy in biomass-tar sufficiently and also avoid the problem of too high cost of catalysts; it is also considered that the yield of biomass-tar in the pyrolysis decreases with the increasing of reaction temperature. Therefore, this paper tries to overcome the problem of biomass-tar through high-temperature pyrolysis.This paper chooses rice husk tar as the studying object to research into its physical and chemical properties and pyrolyzes the rice husk tar to research into the physical and chemical properties of its pyrolyzates. The main content is as follow:The solubility of the rice husk tar in Acetone is larger than that in Ethanol. The main components of the rice husk tar and its distillate which can be measured with GC-MS analysis are phenol with its derivatives, polyaromatic hydrocarbons with their derivatives and alkenes with their derivatives. It can be known by thermal gravimetric analysis of the rice husk tar that different heating rates cannot effect its thermal weightlessness.Using the laboratory bench from original designation to pyrolyze the rice husk tar, the cracking ratios of the bench and the thermal balance both arise with the increasing reaction temperature; the cracking ratio of the bench is lower than the thermogravimetric data because the application amount of the tar in the experiment with thermal balance is less than that on the laboratory bench, at the same temperature, the heat can touch with the tar more sufficiently, so the cracking ratio is higher; after GC-MS analysis, the main components of pyrolysis products are known, meanwhile, it is chosen as the examples Naphthalene, Fluorene, n-Hexadecanoic acid, Pyrene and Phenol,4-ethyl- to introduce the changes of the content of the components of pyrolysis products. Among these compounds, the contents of Naphthalene, Fluorene and Pyrene increase with the increasing of reaction temperature; the contents of n-Hexadecanoic and Phenol, 4-ethyl- decrease with the increasing of reaction temperature. These are because breakdown of the tar molecular keys in bridge results in ring-open reaction, polyaromatic hydrocarbons converse into single-ring compounds and single-ring compounds converse into chain free racials thorough ring-open reaction, these chain free racials combine with other free racials forming chain compounds.

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