Dissertation > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification theory ( combustible gas,gas )

Experimental Research of Coal Hydrogasification

Author ChenZhenXing
Tutor HeBoShu
School Beijing Jiaotong University
Course Engineering Thermophysics
Keywords ZEC Coal hydrogasification Pressurized fixed bed Carbon conversion Reactor
Type Master's thesis
Year 2011
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Coal will remain the dominant energy is the future for a long period of time, and the traditional use of coal in the process of energy utilization efficiency is low, the pollution is worsening. According to the status quo of China's energy structure, the development of energy-efficient, low emission coal utilization system has an active and important significance. The use of near-zero emission coal (ZEC) system is a state-of-the-art clean coal power generation technology, power generation efficiency of over 70%, while pollutants can achieve near-zero emissions. Coal hydrogasification be a key part of the ZEC, therefore, the characteristics of the coal hydrogasification become very meaningful. The papers in the collection of a large number of documents, to learn and absorb the results of previous studies based on, based on the near-zero emission coal utilization system hydrogasification process, mainly in the following three aspects: hydrogasification pressure thermobalance (TGA) experiments, pressurized fixed bed reactor design and construction of the experimental station, based on the laboratory bench to build coal hydrogasification experiments. Coal and semi-coke hydrogasification experiments were carried out on the TGA. The analysis, Shendong and treasure two coal samples experimental studies of both coal and its semi-coke gasification difference and analyze the different coal types, temperature, pressure, and catalyst gasification results. Experimental study found God East and treasure two coal samples the hydrogasification characteristic differences, the following conclusions: (1) different types of coal hydrogasification results are very different, the physical characteristics of the coal a great impact factors; (2) in the TGA experiments, the raw coal hydrogenation experiment as effective as good char experimental effect; (3) in the TGA experiments, the temperature is an important factor in a certain temperature range , the increase in temperature, can improve the carbon conversion efficiency, i.e. to increase the yield of methane; (4) in the TGA experiments, increased pressure, Shendong semi-coke conversion decreases, while Po half coke carbon conversion rate increases; ( 5) In the high pressure TGA experiments, adding Na2C03 catalyst Po half coke reaction is activated, and the carbon conversion rate was increased. According to the summary and analysis of the experimental results of TGA master coal hydrogasification some practical experience. Order not subject to the limitations of the the TGA experimental conditions the more convenient to carry out more in-depth experimental study of the hydrogenation of coal gasification, design and construction for the experimental study of pressurized fixed bed reactor experiment station. The bench by using Incoloy800HT as the main reaction tube welded steel 316L stainless steel flanges meet the pressure range of 0-10MPa, temperature range 0-1200 ℃ coal hydrogasification experiments carried. The paper contains part of the entire experiment station research, design and build a detailed process, for coal hydrogasification experimental process were discussed. Structures completed careful debug confirmed its ability to meet the requirements of the experiment. In the experimental stage has been completed based the different pressures, different temperatures group coal hydrogasification Experimental data obtained in the experiment stage. Conducted a theoretical analysis of the experimental data, and the conclusions are as follows: (1) at the same temperature 830 ° C under the experimental conditions, along with pressure from 3MPa increased MPa experiment, the carbon conversion rate has improved to some extent but not significantly ; (2) under the experimental conditions of the same pressure 4MPa, as the temperature was increased to 830 ° C from 630 ℃ coal hydrogasification reaction proceeds more fully, the rate of carbon conversion and CH4 outputs significantly improved. The last improvements of existing experimental station, the prospect of the the subsequent experimental process and experimental.

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