基于动网格技术的电除尘器泄爆过程数值仿真

发布时间：2018-04-06 06:29

  本文选题：泄爆　切入点：动网格　出处：《热能动力工程》2017年08期

【摘要】：为研究电除尘器在泄爆过程中流场与泄爆阀的动态特性,基于动网格技术,建立了泄爆过程中流体与阀体间的耦合关系,对泄爆过程进行了三维瞬态模拟,对不同爆炸压力、阀盖行程、弹簧刚度以及气体介质温度对泄爆过程的影响进行了分析。对初始温度为2 000 K,相对压力40 kPa的空气介质,阀盖行程60 mm泄爆阀在0.152 s内完成泄爆并复位,泄放体积约为2.95 m~3。分析结果表明:随着内部压力的增大,泄爆时间随之呈线性增加;增大阀盖的行程,阀盖前期运动情况不变,中后期泄放速率增大,总体泄放时间降低,且降低趋势逐渐平缓;一定范围内改变弹簧的刚度对泄爆效果无明显影响;随着气体介质温度的降低,泄爆时间与泄放速率迅速增加,温度从2 000 K降低到300 K时,泄爆时间从0.15 s增加到0.35 s,但泄放过程最大马赫数基本不变。
[Abstract]:For the study of electrostatic precipitator in the venting process flow and vent valve dynamic characteristics, dynamic grid technology based on the established coupling relationship between the fluid and the venting valve body in the process of venting process of three-dimensional transient simulation of different explosion pressure, valve cover travel, spring stiffness and gas temperature has carried on the analysis to the venting process. The influence of the initial temperature is 2000 K, the relative pressure air medium of 40 kPa, 60 mm stroke valve cover vent valve within 0.152 s venting and reset, discharge volume is about 2.95 m~3. the results show that: with the increase of internal pressure, venting time increase linearly; increase the valve stroke, constant valve cover pre movement, in the late discharge rate increases, the overall discharge time is reduced, and the decreasing trend becomes slower; changing the spring stiffness in a certain range has no obvious effect on the venting effect with gas; When the temperature of the medium decreases, the venting time and the discharge rate increase rapidly. When the temperature decreases from 2000 K to 300 K, the venting time increases from 0.15 s to 0.35 s, but the maximum Maher number in the relief process is basically unchanged.

【作者单位】： 燕山大学机械工程学院;燕山大学国家冷轧板带装备及工艺工程技术研究中心;燕山大学环境与化学工程学院;
【基金】：河北省自然科学基金资助项目(E2015203236) 河北省重大技术创新项目(10273920z)
【分类号】：X932
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本文编号：1718396