Chemical Kinetics Model And Numerical Simulation Research Of Carbon And Mercury

This Paper created the Chemical equilibrium thermodynamics model and Chemical reaction kinetics model in a classic environment of entrained flow hydrogasifier, and studied the factors which would change the progress of mercury speciation transformation and hydrogasification with ChemKin 4.0. This paper also did a numerical simulation of an experiment which offered a process of hydrogasification with Fluent, and compared the results with chemical calculation and the experiment.The chemical calculation and numerical simulation both point out that the main form of mercury in entrained flow hydrogasifier is gaseous element; the increase of pressure will both increase the progress of mercury oxidition and the conversion ratio of carbon, the composition of gasification product will become better, too; the increase of H/C mass ratio will restrain the oxidition of mercury, but it will promote the gasification, but the influence to the gasification product is not immutable.The chemical calculation and parts of numerical simulation believe that the increase of temprature will restrain the oxidition of mercury, and it will restrain the progress of gasification, the composition of gasification will become worse, too; but other numerical simulation point out the increase of temprature will help the oxidition of mercury, and the gasification will accelerate, the composition of gasification will become better.The result of chemical equilibrium thermodynamics model also points out the most important element in the process of mercury oxidition in the entrained flow hydrogasifier is not Chlorine just as in Coal-fired power plant but Sulfur.The result of both chemical calculation and numerical simulation somewhat coincided with the result of experiment, but over predicted the conversion ratio of carbon, and the influence of temprature is not sure, more work should be done in the future to consummate the model.