Study on simulation of pulverized coal gasification process in the GSP gasifier

A model of entrained-flow coal gasifier (1920 t/d and single nozzle) was established to simulate the gasification process of pulverized coal from Ningxia of China on the basis of the ANSYS/FLUENT. In order to simulate the characteristics of coal gasification process, the Lagrange model was adopted to obtain properties of particles, and the standard k-epsilon turbulence model was applied to the gas phase flow. Meanwhile, the species transport model and modified eddy-dissipation model (EDM) were used to simulate the species transport and gas phase reaction, respectively. Radiation heat transfer was modeled with the P1 model. The simulation results were in good agreement with the actual production data. In addition, the effects of the pressure, temperature, oxygen-coal ratio and steam-coal ratio on gasification process were studied by using this model. It was found that increasing of the gasification pressure had little effect on the composition of outlet gas. The concentration of CO and H2 increased with the increase of temperature. The best oxygen-coal ratio range was 0.70–0.85 for this gasifier and coal sample. The steam-coal ratio was decided by the actual operating conditions of the gasification. The simulation of coal gasification process can predict the details of flow field, temperature field, velocity field and concentration fields in the gasifier. It is helpful to clearly understand coal gasification behaviour inside gasifier so as to better understand the actual gasification process. Furthermore the simulation method is practicable in the gasifier design and structure optimization, also supplies some useful data to assist the production operation. This article is protected by copyright. All rights reserved

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