DFE测试方法—定量滤芯截留率和留存率
滤芯早期的过度的卸载将是滤材失效的象征。滤芯 B 在 ***16889 多次通过测试
的过滤效率(β7[c]>1000)。然而当相同的滤芯在 DFE 多次通过测试下 Beta 值将下降。滤材的
选择是基于滤芯生产厂商的 Beta 值。Beta 值是 ***16889 多次通过的产物而没有考虑到系统流
量变化的动态条件。
比较 Hy-Pro 两种相同采用 G7 双层玻纤的性能,所有 Hy-Pro 滤芯采用 G7 或更好
的滤材并根据 DFE 多次通过测试来设计和发展。
滤芯Hy-Pro1 Hy-Pro2
过滤比效率 β7[C]>1000 β7[C]>1000
高流量112 112
低流量56 -
污染物 (注入率) 3mg/1 3mg/1
虽然污染物卸载影响是明显的,根据 DFE 测试在
动态流量条件下 Beta 值与 ***16889 多次通过测试都是 β7[C]>1000。
滤芯 A1 和 Hy-Pro(动态条件)的性能,两种滤芯在 ***16889 和 DFE 测试下都有
***的颗粒截留表现,DFE 测试下的 Hy-Pro 滤芯在下游能够更稳定的颗粒计数和在动态流量
条件下更一致的过滤效率。颗粒留存率的提高将对系统清洁度变得更可预见性。
滤芯
滤芯 A1 Hy-Pro1
过滤比效率 β7[C]>1000 β7[C]>1000
高流量112 112
低流量56 56
污染物
(注入率)
3mg/1 3mg/1
DFE多次通过测试方法
—冷启动污染物存留
一旦滤芯已经截留足够的污染物达到ΔP 值大约是 90%时,脏的过滤器指示器设定,
大流量走到 0,注入系统被关停片刻。主要的流量泵被启动能迅速达到的滤芯精度伴随实时
的实际运转中的颗粒数以测量污染的工作滤芯的存留率。
模拟系统启动以后,系统继续演示测试负载循环来进一步监测重启以后的滤芯存留率,这一
部分 DFE 测试的目的是用以量化这种滤芯
在重启的状态下,对先前截留的颗粒的纳污
容量有多好。重启前的存在也许是时间的
原因,或是系统温度的作用用一个带有一定
的污染物的滤芯来模拟冷启动。
滤芯的性能,
A1,A2 是同一批滤芯,同时做了 DFE 重启
测试在重启期间滤器后的 6(C)颗粒数增长了
20 个按 *** 标准 4(c) 和 6(c) 颗粒数增长了 4
个在重启试验期间,没有新的污染物被注入
所以所测颗粒是已经在系统里的或是
滤芯卸载的。结果是由于滤芯的
纳污方式不正确而导致了流体
高度污染。
Hy-pro3 滤芯的
卸载是明显的,但是影响大大的降低了。
滤芯 A3比 Hy-pro 3 滤芯对 6 的
卸载大 7 倍甚至更多,在 14(
c)的颗粒
上大于等于 35 倍。DFE 精度级的 Hy-pro
滤芯比只按 ***16889 多次标准设计和标
定的滤芯有更高的存留率。
如果我们假设一个滤器像一个黑洞,
里面截留了所有的污染物,那我们在运行
系统是肯定有虚假的安全感。如果你只讨论
滤芯的截留率时,也应该考虑一
下它的存留率。
下游 滤芯 3 4[C]6[C]14[C]***4406:1999
启动前429 136 25 16/14/12
启动过程中6973 2802 139 20/18/14
下游HY-PRO
滤芯 3
4[C]6[C]14[C]***4406:1999
启动前75 10 1 13/11/7
启动过程中2994 404 4 19/16/9
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