Abstract
This work presents primary results of a parameter study for entrained flow gasification using a steady-flow reactor model. The influences of important parameters such as coal types, gasifier pressure, gas/coal feeding rate, and coal particle size were studied based on coal conversion and gas product species. The prediction results were compared and validated against those published previously. In particular, a relative importance of reaction stoichiometry, temperature, reaction time (kinetics), or residence time considered in this simulation work was evaluated to affect the gas composition produced from different coals. The optimal carbon monoxide concentration was observed at an oxygen-to-fuel ratio of 0.8, while a greatest carbon conversion was found at a steam-to-fuel ratio of 0.4. Coal particle size has a strong influence on carbon conversion. However, the coal feeding rate has no effect on carbon conversion despite differences in residence time.
Highlights
In Korea, commercial operation of a newly constructed 300-MW integrated gasification combined cycle (IGCC) power station equipped with an oxygen-blown gasifier commenced in 2016.1 Six other commercial IGCC power plants exist in Japan, Europe, and the United States.[2,3] Coal gasification process occurs at relatively high pressure and temperature
The effects of important parameters such as coal type, gas/coal feeding rate, gasifier pressure, and particle size were studied based on coal conversion and gas product
These results show that the reduction of CO with decreasing O2to-fuel ratio was caused by the reduced temperature and weaker solid reactions
Summary
In Korea, commercial operation of a newly constructed 300-MW integrated gasification combined cycle (IGCC) power station equipped with an oxygen-blown gasifier commenced in 2016.1 Six other commercial IGCC power plants exist in Japan, Europe, and the United States.[2,3] Coal gasification process occurs at relatively high pressure and temperature. Many process parameters affect the composition and temperature of product gases, such as the oxygen/ steam-to-fuel ratio, particle size, coal feeding rate, and injection velocity. Some of these parameters are related to particle residence time. Particle size influences the residence time required to complete the gasification process.[4,5] A smaller particle size enables a higher quality of gas product because of a longer residence time to accomplish more conversion of the coal.[6]
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