Research On Biomass Flash Pyrolysis And Utilization Of Pyrolysis Products

The exploit and utilization of biomass energy is an effective method for relieving the pressures of conventional energy resources shortage and environment pollution in China. Biomass pyrolysis technology which can convert low-quality biomass to higher quality liquid fuel or high add-value chemical material have been pay great attention. It can not only relieve the demand press of power fuel and improve the using efficiency of biomass energy in China rural area, but also can improve the structure of china energy. According to this purpose, a systemic mechanism research on the biomass pyrolysis and the utilization of the pyrolysis products has been carried out.First of all, an introduction of current state of biomass utilization and the future development trend was given., then the development and current research of biomass pyrolysis were introduced.A series of experiments about white-pine pyrolysis were carried out in a glass reactor. The effect of temperature, residence time and the height of sample on the pyrolysis products distributions was investigated. This research results provided the foundation for the mechanism analysis of biomass pyrolysis.The determination of the chemical composition of bio-oil from white-pine was performed according to GC-FTIR analysis, on the other hand, the compositon of bio-oil from cellulose pyrolysis was analyzed by GC-MS. The effect of the process parameters on the character of bio-oil was investigated. The results showed that the further upgrading of bio-oil was necessary because of some undesired characteristics such as high oxygen content.The char yield of biomass pyrolysis was about 20wt%, and the characteristic of the char was analyzed. Char activations were studied in this paper, the BET of the char was increased from 7.449m2/g to 768.3m2/g after the activation process with CO2 activating agent, so the char with the activation process has the potential as the raw material of the active carbon production.Experimental research on lignin flash pyrolysis was carried out on our bench unit, whose heat was supplied by infrared radiation. The effect of temperature on the pyrolysis product yield was investigated. The components of the tar, which was produced from lignin, were determined by GC-FTIR.Compared with experimental result based on cellulose pyrolysis, cellulose contributed the most part into tar production from biomass, however, lignin would produce gas and char rather than tar.Considering the further utilization of the gas product of biomass pyrolysis, the paper put forward that the production of DME was achieved through the one-step method using the hydrogen and carbon monoxide, which were obtained from the gas products. The economic . analysis of the production of DME by synthesis gas was studied. The experiment on the production of DME using synthesis gas were carried out, and the results provided reference material for the further research.