刚性过滤器脉冲反吹过程中滤管内动态压力特性

Dynamic pressure characteristics in filter candle during process of pulse cleaning for rigid filter

催化汽油吸附脱硫（S-Zorb）装置中反应器过滤器的脉冲反吹性能直接影响吸附剂的分离与循环。利用建立的滤管过滤性能实验装置,采用高频动态压力传感器,测定脉冲反吹过程中沿滤管长度方向不同位置处滤管内动态压力随时间的变化特性,分析了滤管长度、反吹压力和脉冲宽度对滤管内动态压力特性的影响规律。结果表明：自开口端至盲端,滤管内动态压力的压力峰值先逐渐变大后基本不变;相同反吹条件下,随着滤管长度的增加,滤管内沿长度方向各位置处的压力峰值均降低。实验范围内,1750-2000 mm滤管开口端附近的动态压力在达到压力峰值后降低为负压,并在反吹气流和脉冲压力波的共同作用下持续振荡。适当提高反吹压力以及增加脉冲宽度可以改善长滤管的反吹效果。

The performance of reactor filter in the adsorptive desulphurization unit of catalytic gasoline（S-Zorb） will pose direct impacts on the separation and recycling of adsorbent. By utilizing high frequency sensors and experimental set-up of filtration performance during the process of pulse cleaning, the dynamic pressure characteristics varied with time in different measurement points along filter candles were investigated. Also, the effects of the length of filter candle, cleaning pressure and pulse width on dynamic pressure characteristics were analyzed. As shown by the results, the maximum pressure in the filter candle remained stable after gradually increasing from the open end to the blind end. Meanwhile, lower maximum pressure in different measurement points along the whole filter candle was found under the same operating conditions when the longer filter candle was utilized. In these experiments, the dynamic pressure near the open end of 1750—2000 mm filter candles reduced to negative pressure after reaching the maximum pressure. Due to the combination of airflow and pulse pressure wave, the sustained oscillations in the dynamic pressure profile can be discovered. Furthermore, the cleaning efficiency of long filter candle can be improved through the method of properly increasing cleaning pressure and pulse width.