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On the influence of an added fraction of hygroscopic salt particles on the operating behaviour of surface filters for dust separation by moisture-induced deliquescence and efflorescence

添加部分吸湿盐颗粒对湿气潮解和风化除尘表面过滤器运行行为的影响

基本信息

批准号：
281470635
负责人：
Dr.-Ing. Qian Zhang
金额：
--
依托单位：
Fachgebiet Sicherheitstechnik/Umweltschutz
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/281470635?language=en
关键词：
influence added fraction hygroscopic salt

项目摘要

The basis for targeted manipulation of the operating behaviour of surface filters is, as a rule, always attributable to the fact that a favorable performance adjusts itself at long cycle times. These are obtained by a slow increase in pressure drop during the filtration phase and by a low residual pressure drop after the regeneration. Technically, such states can be realized by so-called raw gas conditioning. Here the particle characteristics in the flight phase or in the dust cake are selectively modified by dosing additives or introducing energies. It is known that the particle adhesion is generally strengthened with increasing gas humidity. While an increase of particle adhesion in the dust cake reduces/prevents the compression of the dust cake in the filtration phase and promotes the cohesion of the cake layer during the regeneration, an increase of adhesion between the cake layer and the filter medium surface impedes the detachment of the dust cake during the regeneration. A separate influence of these two effects is not possible by a permanent change of the gas humidity during the filtration.The deliquescence and efflorescence properties of hygroscopic salt particles, which can be induced by a transient increase in gas humidity, can be considered as possibilities for the formation of solid bridges between dust particles in the filter cake. With this raw gas conditioning concept, a flexible and targeted strengthening of the cohesion in the filter cake without an accompanied modification of the adhesion between the cake layer and the filter medium is theoretically possible. Within the scope of the proposed research project, it is being studied experimentally and theoretically, which effects an added fraction of hygroscopic salt particles with their deliquescence and efflorescence properties in the dust cake has on the operating behaviour of surface filters, in particular with the aim of a targeted manipulation of the operating behaviour of surface filters by periodic dosing of hygroscopic salt particles. The observed positive effects will be checked by systematic examinations with standard test filters from needle felts on a laboratory filter testing apparatus. In addition, critical boundary conditions for a possible technical implementation of the method are to be investigated experimentally by extended screening tests. Based on this, a quantitative assessment of the new conditioning process is made.

表面过滤器的操作行为的有针对性的操纵的基础通常总是归因于有利的性能在长周期时间内自我调整的事实。这是通过在过滤阶段缓慢增加压降和通过在再生后保持较低的残余压降来实现的。从技术上讲，这种状态可以通过所谓的原料气调节来实现。在这里，通过定量添加剂或引入能量来选择性地改变飞行阶段或尘饼中的颗粒特性。已知颗粒粘附通常随着气体湿度的增加而增强。虽然尘饼中颗粒粘附力的增加减少/防止了过滤阶段中尘饼的压缩并促进了再生过程中滤饼层的内聚，但是滤饼层和过滤介质表面之间粘附力的增加阻碍了再生过程中尘饼的分离。在过滤过程中，气体湿度的永久性变化不可能单独影响这两种效应。由于气体湿度的瞬时增加，吸湿盐颗粒的潮解和风化特性可以被认为是滤饼中粉尘颗粒之间形成固体桥的可能性。通过这种原料气调节概念，在理论上可以灵活和有针对性地增强滤饼中的凝聚力，而不伴随滤饼层和过滤介质之间的粘附性的改变。在拟议的研究项目范围内，正在进行实验和理论研究，这会影响粉尘饼中具有潮解和风化特性的吸湿盐颗粒的添加部分对表面过滤器的操作行为的影响，特别是通过定期定量给药吸湿盐颗粒来有针对性地操纵表面过滤器的操作行为。将通过在实验室过滤器测试设备上使用来自针刺毡的标准测试过滤器进行系统检查来检查所观察到的积极作用。此外，临界边界条件的一个可能的技术实施的方法是实验研究扩展筛选试验。在此基础上，对新的调质工艺进行了定量评价。