气流导柱对集尘滤筒脉冲清灰性能的影响

INFLUENCE OF AIRFLOW GUIDE COLUMN ON PULSE DUST-CLEANING IN CARTRIDGE FILTERS

常规滤筒集尘器在反吹清灰时,存在滤筒下部清灰能量过盛而上部清灰能量不足的现象,导致滤筒上部清灰不彻底而下部易破损。提出了在滤筒内部设置气流导柱,引导反吹气流,改善滤筒内部流场的方案。采用数值模拟与试验测试相结合的方法,对滤筒反吹清灰性能进行了分析。结果表明:内置气流导柱的新型滤筒反吹压力分布更加均匀,滤筒中下部冲击压强下降至原型滤筒的65%,解决了过喷吹问题,滤筒上部形成冲击压强尖峰解决了欠喷吹问题。同等工况下,内置气流导柱的新型滤筒相比原型滤筒拥有更长的使用寿命,预估使用寿命可达到普通滤筒的8倍。

Pulse back blow dedusting with conventional cartridge filters was found to be imbalanced in terms of energy allocation,with the lower and upper cartridge sections respectively getting excessive and insufficient energy apportionment,consequently causing not only the lower section to be more susceptible to damage,but also the upper section to be ineffective in dedusting.In light of this problem,the present study proposed fitting airflow-guiding columns within the filter cartridge to guide the reversely-blow airflow and improve the internal flow field.A series of numerical simulations and experimental tests were employed to determine how the cartridge fared in pulse jet cleaning.The results showed that the proposed column-fitted filter cartridge received more evenly-distributed reversely-blown pressure,as the impact pressure intensities at the middle and lower cartridge sections were reduced to 65%of that of the original cartridge,thereby rectifying the excessive blowing strength issue.At the same time,the proposed modification also generated a sharp impact pressure intensity peak at the upper cartridge section,which subsequently addressed the weak blowing strength issue.Furthermore,under unchanged working conditions,the proposed column-fitted filter cartridge also gained a service life that is 8 times longer than its conventional counterparts.