Hydrogasification Characteristics Of Coals In TGA

As the main primary energy source in China, coal will be remained for a long time in the future. Since the traditional coal utilization technology has two remarkable fate defaults, i.e., low efficiency and heavy pollutions, it is necessary to develop a new technology with high efficiency and low pollution emission. Zero Emission Coal (ZEC) utilization system is a kind of advanced clean coal power technology by which the power efficiency reaches 70% and the pollution emission is nearly zero. The research of coal hydrogasification characteristics is very important because the coal hydrogasification is one of the key processes of the ZEC system.The current state of other similar ZEC system worked over by some institutes was briefly introduced and summarized. The contents in this paper focus on three aspects:(1) the Chemical equilibrium thermodynamics model; (2) hydrogasification experiment in the high pressure Thermal Gravimetric Analyzer (HP-TGA); (3) high pressure fix-bed reactor system design.The chemical equilibrium thermodynamics model has been set up based on some hypotheses which could predict the composition of gasification. The effects were compared for the operation parameters of different pressure, temperature and the H/C rate, based on the simulation results, and an optimal operation parameter range was suggested.To validate the prediction model of coal hydrogasification, the experiments of coal hydrogasification in the high pressure and high temperature conditions had been carried out in TGA. Through analyzing those factors which may affect the coal hydrogasification results, some operation experiences have been obtained. Through the results comparisons from prediction model and TGA experiment, the model shows good prediction results as the conclusion. There are, however, a lot of work should be done for the future research to understand better the coal hydrogasification process and then, the coal-based ZEC system.High pressure fix-bed reactor system has been designed preliminarily, by which hydrogasification experiment can be carried out at the conditions of pressure of 0-6MPa and temperature of 650-1200℃. The designed system includes the high pressure and the high temperature fix-bed reactor design and the appropriate instruments selection.