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The Theoretical Research On Pyrolysis-Permeability Characteristics Of Lignite

Posted on:2011-02-24Degree:MasterType:Thesis
Country:ChinaCandidate:Y YangFull Text:PDF
GTID:2121360305971685Subject:Safety Technology and Engineering
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The coal is the main mineral energy and chemistry raw material, but also the serious environment pollution. The coal pollution can be controlled by the technology of coal highly effective and the pure transformation. The coal body's underground gasification and the pyrolysis are research hot spots on melt purely picking. Moreover, it is critical for pyrolysis product's transmission which is also called the permeability of coal pyrolysis relationship. The research not only has the important theory significance, but also has the widespread practical application value in the project. In view of this important topic, based on the coal pyrolysis and the permeability elementary theories, the study takes the lignite in Inner Mongolia for example. Through theoretical analysis and experimental study, we conducted systematic research on the permeability character of lignite in the pyrolysis process, and also conducted when it was applied to industry. The findings play an important role in understanding the permeability character and conducting the coal body's underground gasification and the pyrolysis industrial application and so on.I have mainly completed the following research work:1. I stated the characteristics of coal's pyrolysis and permeability, then conducted the research on the characteristics of coal's permeability in the process of coal's pyrolysis, which has provided the theory basis for the coal body pyrolysis permeability test as well as the result analysis.2. I conducted the research on lignite in the low temperatures(0℃~100℃)by experimental platform of permeability with the three-dimensional stress (MDS200), which is the characteristic of pyrolysis before the coal's permeability in the research. Separately in different temperature and coal bed burial depth (200 meter, 250 meter, 300 meters), I determined the lignite penetration coefficient in the condition of different pore pressure. I obtained the results of change tendency and the characteristic point that the lignite permeability coefficient along with the bulk stress, the pore pressure, the temperature respectively in the low temperature section, and has carried on the analysis to its respective change's reason;3. Using the high temperature pyrolysis permeation apparatus, I conducted the research separately on three kinds of different lignite samples (vertical bedding, parallel bedding, including longitudinal crack) in the high temperature section (100℃-400℃), which is namely the permeability of first stage's pyrolysis character. Maintaining the axial compression and the confining pressure, I determined the lignite penetration coefficient in the different temperature as well as under the different pore pressure. I obtained tendency that the lignite permeability coefficients which are different types (vertical bedding, parallel bedding, including longitudinal crack) respectively along with the hole pressure, the temperature change, and also obtained the respective general formula and the extreme point;4. I carried on the generalized analysis to the coal's pyrolysis - permeability rule as well as its influencing factor, and analyzed some key questions in the implementation of the coal's in-situ pyrolysis industry. For example: the product transmission and the thermal deformation character in the process of pyrolysis, and controlling pyrolysis region in that. Moreover, we proposed some following research key, which will provide the basic theory of industrial application for the underground in-situ pyrolysis in the future.
Keywords/Search Tags:lignite, permeability coefficient, pyrolysis character, high temperature pyrolysis permeation apparatus, bulk stress, temperature
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