Process analysis of catalytic multi-stage hydropyrolysis of lignite |
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| Affiliation: | 1. Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA;2. Idaho National Laboratory, Idaho Falls, ID 83415, USA;3. Department of Chemistry, University of Wyoming, Laramie, WY 82071, USA;4. National Institute of Clean and Low Carbon Energy, Beijing 102211, China;5. School of Energy Resources, University of Wyoming, Laramie, WY 82071, USA;6. Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;1. School of Chemical Engineering, Xiangtan University, Xiangtan, Hunan 411105, PR China;2. National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, PR China |
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| Abstract: | The process and the mechanism of multi-stage hydropyrolysis (MHyPy) of coal were investigated by analyzing the products of different MHyPy processes in detail. The results showed that the suitable holding temperature was near the peak temperature (350–500 °C) at which more free radicals were produced rapidly, thus more oil was formed and the hydrogen utilization efficiency was increased. The cleavage of organic functional groups in char from MHyPy was mostly affected by the pyrolysis temperature. The effect of retention was to change the product distribution through stabilization of the free radicals and hydrogenation of the heavier products. In the holding stage the specific surface area and average pore volume of the char were increased due to the escape of more hydrogenation products. |
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