Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 33, Issue 6, Pages 1767-1776Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-016-0074-x
Keywords
Entrained-flow Gasifier; Dynamic Modelling; Simulation; Reaction; Water Wall Heat Transfer; Slag Behavior
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A mathematical model is developed to simulate a pilot Shell entrained-flow coal gasifier. Submodels of specific structures of the gasifier are established to simulate the complicated gasification process. The model includes the total energy conservation equation and mass conservation equations for the gas components, solid flow, and gas flow. It simulates the influence of the gasifier structure and dimensions and can calculate the effects of changing almost every important operation parameter, e.g., the syngas composition, gasification temperature, carbon conversion ratio, walllayer temperature, and slag mass flow rate. The model can predict the syngas composition under a limited residence time condition. Furthermore, it considers the heat transfer coefficient of each layer of the water wall to calculate its heat loss and temperature. Thus, the model also reflects the influence of performance parameters of the gasifier's water wall. The slag mass flow rate on the wall is calculated using a slag submodel.
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