首页|Numerical Simulation and Optimization of Staged Combustion and NOx Release Characteristics in Precalciner
Numerical Simulation and Optimization of Staged Combustion and NOx Release Characteristics in Precalciner
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国家科技期刊平台
NETL
NSTL
万方数据
维普
In order to study the combustion characteristics in a precalciner,the temperature and composition field in a typical Trinal-sprayed calciner were numerically analysed.The results obtained by simulation were compared to actual measurements and the simulated results were in good agreement with the measured ones.The results indicated that the aerodynamic flow field in the precalciner is satisfactory,and a symmetrical reflux occurs in the shrinkage zone of the precalciner because of air staging,which can increase the residence time of the solid particles.The temperature distribution in the furnace is uniform,and the average temperature is greater than 1200 K,which can satisfy the conditions for the pulverised coal combustion and raw material decomposition.The mass fraction distribution of oxygen,carbon monoxide,and carbon dioxide in the precalciner is closely related to the temperature distribution.The concentration of nitrogen oxides (NOx) exhibits a trend of increasing,decreasing and then increasing,and finally tending to a stable level.Within a certain velocity range,the average temperature in the precalciner and the decomposition efficiency of the raw material increase as the flue gas velocity increases.When the flue gas velocity is 24 m/s,the overall performance of the precalciner is optimal.
国家科技期刊平台
NSTL
万方数据
维普
