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N阀和U阀内流动结构比较的数值模拟

Boiler Technology(2013)

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Abstract
采用计算颗粒动力学(CPFD)方法对一种新型低流动阻力N型回料阀内的气固流动特征进行了数值模拟研究,通过考察其颗粒返料率、压力分布及气体反窜情况等参数,论证了其流动阻力特点,并与传统的U型回料阀进行了对比,从而验证了N阀替代U阀用于循环流化床锅炉的可行性。结果表明,N阀在提高颗粒返料率、避免气体反窜上存在明显优势,N阀倾斜段的设计显著降低了回料阀内的气固流动阻力。
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Key words
N loop-seal,U loop-seal,gas-solid flow,gas inverse flow phenomenon
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