Numerical Simulation Of Hydrogasification In A Pressured Fluidized Bed

China is one of the largest coal producer and consumer countries in the world. In the energy consumption of China, the coal consumption accounts for about73.4%. In the future, coal will still play an important role in the developing of China. Since the traditional utilization of coal has two fates, low efficiency and serious pollution, so it is necessary to develop a new technology to avoid this. Zero emission coal (ZEC) utilization system is an advanced technology by which the efficiency of coal utilization can reach about70%and the emission can approach zero. The technology of coal hydrogasification is the key process of the ZEC system.The content in this paper focus on three aspects, simulate of the gas-solid flow behavior in a pressurized fluidized bed, use the chemical equilibrium thermodynamics model to simulate the hydrogasification in a pressurized fluidized bed, simulate the coal gasification in a pressurized fluidized bed.In the simulation of the gas-solid flow behavior, the following conclusions are obtained:As the pressure increases, the minimum fluidization velocity decreases. As the temperature increases, the minimum fluidization velocity decreases too.In the simulation of hydrogasification by using the chemical equilibrium thermodynamic model, the following conclusions are obtained:As the pressure increases, the volume fraction of the methane rise rapidly, and when the pressure reaches3MPa, it almost does not change any more. As the temperature increases, the volume fraction of methane decreases. As the H2/coal mass ratio increases, the carbon conversion increases, and the volume fraction of methane decreases.In the simulation of hydrogasification by using the CFD methods, the following conclusions are obtained:As the pressure increases, the volume fraction of the methane rise rapidly early, and then it almost do not change any more. As the temperature increase, the volume fraction of methane keeps stable early, and then decreases rapidly. As the H2/coal mass ratio increase, the carbon conversion increases, and the volume fraction of methane decreases.