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Clogging mechanisms involved in the aging process of cleanable filter media

机译：可清洗过滤介质老化过程中涉及的堵塞机制

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When different cleanable filter media are tested according to the VDI3926 guideline, the aging procedure influences the test result. A new simple aging chamber was developed within the scope of this work, by which long term aging tests can be carried out without blocking the technical sophisticated VDI 3926 test equipment. During the investigation of the aging progression it turned out that after a certain aging time the pressure drop over the filter media shows an extreme increase. This effect has been investigated in detail and the reason was found in the steady increasing under pressure on the clean gas side and the corresponding over pressure decrease during the regeneration. Compared to the well known pressure controlled cleaning the steady under pressure increase is the major cause for the observed differences in the filtration mechanisms. The extreme pressure drop increase occurs for shorter cycle times, slower filtration velocities and higher cleaning intensities later and will most probably not be observed with the usual VDI aging test conditions (short cycle times, slow filtration velocity). It will be proposed to use the time of the extreme pressure drop increase as a characteristic aging value for the estimation of the clogging behaviour. As an additional method for evaluating the filtration behaviour of different filter media the characteristic aging value is used in combination with the mean clean gas concentration and the residual dust mass. The significance of the comparison of different filter media is improved by plotting these specific values over the filtration velocity.
机译：根据VDI3926指南测试不同的可清洗过滤器介质时，老化过程会影响测试结果。在此工作范围内，开发了一个新的简单老化箱，通过该老化箱可以进行长期老化测试，而不会阻塞技术先进的VDI 3926测试设备。在研究老化过程时，发现在一定的老化时间之后，过滤介质上的压降会急剧增加。已经对该效果进行了详细研究，并且发现了在清洁气体侧的压力下稳定增加以及再生期间相应的过压降低的原因。与众所周知的压力控制清洗相比，在压力增加下保持稳定是造成过滤机理差异的主要原因。极端的压降增加出现在较短的循环时间，较慢的过滤速度和较高的清洁强度之后，并且在通常的VDI老化测试条件（较短的循环时间，较慢的过滤速度）下极有可能无法观察到。建议将极端的压降增加的时间用作特征性的老化值，以估计堵塞行为。作为评估不同过滤介质过滤性能的另一种方法，将特征老化值与平均清洁气体浓度和残留粉尘质量结合使用。通过将这些特定值绘制在过滤速度上，可以提高不同过滤介质比较的重要性。

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