Abstract
Quench of high temperature raw syngas to a certain degree is of great importance for the availability of a gasifier, and it influences the economical running of whole energy utilization system. Chemical quench is one of the best choices for high temperature syngas quench. Based on the Gibbs free energy minimization approach, thermodynamic analyses are carried out to elucidate the quench process of high temperature syngas. The optimal quench temperature and optimal feeding rate of coal are achieved with the consideration of effects such as inlet syngas temperature, steam input and moisture content in the coal. The results show that chemical quench is an effective way for high temperature syngas quench. The higher the temperature of syngas is, the better the chemical quench effect is. Steam input to the syngas can enhance the chemical quench reaction for the same coal feeding rate, while the effect of moisture content in coal on chemical quench is negligible.
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