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基于Hurst方法的脉动流化床床层稳定性分析
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Abstract:
Hurst方法可用于揭示流型转变，区分部分不同类型颗粒的流动结构，检测流化床内气体分布的不均匀性。本文基于Hurst方法对脉动流化床床层稳定性进行分析。通过改变细颗粒含量、流化气速和脉动能量，对床层压力信号进行监测，来实现对脉动流化床床层稳定性进行研究。研究结果表明：适当添加细颗粒可提高床层稳定性；增加流化气速，在一定范围内，气泡小，流化均匀稳定，超过一定范围，干扰因素增加，床层波动剧烈；引入脉动能量，可以削弱气泡扰动、降低气泡频率，但超过一定范围削弱能力会减弱。
The Hurst method can be used to reveal flow pattern transitions, distinguish the flow structures of different types of particles, and detect the non-uniformity of gas distribution in fluidized beds. This article analyzes the stability of a pulsating fluidized bed based on the Hurst method by changing the fine particle content, gas velocity, and pulsating energy, the bed pressure signal was monitored to study the stability of the pulsating fluidized bed. The research results indicate that adding fine particles appropriately can improve the stability of the bed; Increasing the fluidization gas velocity, within a certain range, the bubbles are small, and the fluidization is uniform and stable. Beyond a certain range, the interference factors increase, and the bed fluctuates violently; Introducing pulsating energy can weaken bubble disturbance and reduce bubble frequency, but beyond a certain range, the weakening ability will weaken.
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