Su Weiguang, Shi Meiyu, Zhang Ben, Wang Wenxin, Song Xudong, Yu Guangsuo
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, China.
Xi'an Thermal Power Research Institute Co, Ltd, Xi'an, Shanxi 710032, China.
ACS Omega. 2023 Feb 14;8(8):7913-7921. doi: 10.1021/acsomega.2c07675. eCollection 2023 Feb 28.
Due to the complex atmosphere of the entrained flow gasifier, it is difficult to obtain reactivity properties of coal char particles under high-temperature conditions by experiment. The computational fluid dynamics simulation method is a key way to simulate the reactivity of coal char particles. In this article, the gasification characteristics of double coal char particles under HO/O/CO atmosphere are studied. The results show that the particle distance () has an influence on the reaction with particles. With the gradual increase of , the temperature first rises and then falls among the double particles due to the migration of the reaction area, and the characteristics of double coal char particles gradually approach that of single coal char particles. The particle size also has an influence on the gasification characteristics of coal char particles. As the particle size varies from 0.1 to 1 mm, the reaction area of particles becomes smaller at high temperature and finally attaches to the surface of the particles. The reaction rate and carbon consumption rate increase with increasing particle size. As the size of double particles is changed, the reaction rate trend of double coal char particles at the same particle distance is basically the same, but the change degree of reaction rate is different. With the increase of the distance between coal char particles, the change of the carbon consumption rate is larger for the small particle size.
由于气流床气化炉内气氛复杂，通过实验获取高温条件下煤焦颗粒的反应特性较为困难。计算流体动力学模拟方法是模拟煤焦颗粒反应性的关键途径。本文研究了在H₂/O₂/CO气氛下双煤焦颗粒的气化特性。结果表明，颗粒间距（）对颗粒反应有影响。随着的逐渐增大，由于反应区域的迁移，双颗粒间温度先升高后降低，双煤焦颗粒特性逐渐趋近于单煤焦颗粒。颗粒尺寸也对煤焦颗粒的气化特性有影响。当颗粒尺寸从0.1 mm变化到1 mm时，颗粒在高温下的反应面积变小，最终附着在颗粒表面。反应速率和碳消耗率随颗粒尺寸增大而增加。当双颗粒尺寸改变时，相同颗粒间距下双煤焦颗粒的反应速率趋势基本相同，但反应速率变化程度不同。随着煤焦颗粒间距的增加，小颗粒尺寸下碳消耗率的变化更大。
