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首页> 外文会议>AIChE Annual Meeting >Design of Polishing Filter Adsorbents Using Sintered Microfibrous Metallic Networks as Carriers for High Effectiveness Sorbent Particulates
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Design of Polishing Filter Adsorbents Using Sintered Microfibrous Metallic Networks as Carriers for High Effectiveness Sorbent Particulates

机译：使用烧结微纤维金属网络设计抛光滤光片吸附剂作为高效颗粒的载体

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Sintered microfibrous composite materials are a new class of patented materials1-6 for which the voidage can be adjusted from ninety-eight percent down to values similar to a packed bed. Adsorbents entrapped in sintered microfibrous meshes produce exceptionally effective polishing filters. These materials are made by a wet lay paper making process resulting in high uniformity of basis weight. Other materials such as polymer fibers with entrapped particles manufactured by air lay processes do not posses high uniformity of basis weight and the particle sizes that can be used are limited to larger particles. Adsorbent particles small as fifty micron can be entrapped in sintered microfibrous polishing filters while minimizing pressure drop penalties. Pressure drop due to the small particles is minimized by producing the sintered microfibrous materials at voidages of ca. eighty percent. The pressure drop through a constant adsorptive capacity of material decreases with the area squared, so enlarging the footprint of a filter greatly reduces the pressure drop. A recent theoretical breakthrough7,8 (Cahela and Tatarchuk, 2001) accurately estimates pressure drop for the entire range of voidage including values above eighty percent for which the Ergun equation 9 seriously underestimates the pressure drop. A new two layer gas adsorption kinetic model for strong physical adsorption occurring in two layer beds allows design for polishing filter applications. The probabilistic approach for gas adsorption kinetics10 (Yoon and Nelson, 1984) can be extended to a two layer adsorption bed to model a polishing filter. A second concentration breakthrough equation for a two layer bed is developed from an equal time conjecture. This conjecture is that the integral over time of the outlet concentration from the first bed divided by the inlet concentration is equal to the breakthrough time of the polishing filter alone. Both of these approaches result in equations which agree for higher capacity polishing filters. They have the same form, so they can also be averaged to produce a third equation which is more accurate for thin polishing filters than either of the two equations. Application of polishing filters to three air cleaning devices will be described. These are the personal gas mask canister (C2A1), cylindrical collective protection gas canisters, and plate and frame collective protection gas canisters. The two layer gas adsorption kinetic model was used to design experimental tests that demonstrated two to four fold improvements of DMMP gas life to pressure drop ratio over the C2A1 gas mask canister in the same volume (320 cc) as the ASZM-TEDA carbon bed and the HEPA filtration element. The predicted performance of a drop in replacement for the Joint Service General Purpose Mask (JSGPM) using a sintered microfibrous polishing filter will also be described. Gas life of the Hunter M98 and M48 can be enhanced by ca. twenty-five percent in the current design by addition of a microfibrous sintered polishing filter. Plate and frame canisters for collective protection using sinter microfibrous adsorbents can be employed in temperature swing adsorption cycles to lower the overall cost of building protection.
机译：烧结的微纤维复合材料是一种新的专利材料1-6，其中空隙可以从百分之九十八百分点调节到类似于包装床的值。捕获在烧结的微纤维网中的吸附剂产生异常有效的抛光过滤器。这些材料由湿铺纸制造过程制成，导致基重的高均匀性。诸如通过空气敷积工艺制造的夹带颗粒的聚合物纤维的其他材料不具有基重的高均匀性，并且可以使用的颗粒尺寸限于较大的颗粒。小于50微米的吸附剂颗粒可以捕获烧结的微纤维抛光过滤器，同时最小化压降损失。通过在CA的空隙的过程中产生烧结的微纤维材料，由于小颗粒引起的压降最小化。百分之八十。通过恒定的材料的压力降低，面积平方降低，因此大大降低了过滤器的占地面积大大减少了压降。最近的理论突破7,8（Cahela和Tatarchuk，2001）准确地估计了整个空隙的压力下降，包括超过八十百分之八个百分之八十的值，因为埃尔戈等式9严重低估了压降。用于两层床中发生的强物理吸附的新型两层气体吸附动力学模型允许设计用于抛光过滤器应用。气体吸附动力学10（YOON和NELSON，1984）的概率方法可以扩展到两个层吸附床以模拟抛光滤波器。两层床的第二浓度突破等式是从同样的猜想中产生的。该猜想是从第一床分开的入口浓度的出口浓度的整体随着时间的推移等于单独的抛光滤波器的突破时间。这两种方法都导致等式，该等式必须达到更高容量的抛光滤波器。它们具有相同的形式，因此还可以平均以产生比两个方程中的薄抛光滤波器更准确的第三等式。将描述抛光过滤器在三个空气清洁装置中的应用。这些是个人防毒面具罐（C2A1），圆柱形集体保护气体罐，以及板和框架集体保护气体罐。两层气体吸附动力学模型用于设计实验试验，该试验表明，在同一体积（320cc）中的C2a1气体掩模罐中的DMMP气体寿命对DMMP气体寿命的减压比为ASZM-TEDA碳床和HEPA过滤元素。还将描述使用烧结的微纤维抛光滤波器的联合服务通用掩模（JSGPM）的替代替换的预测性能。 CA可以增强猎人M98和M48的气体寿命。通过添加微纤维烧结抛光滤光器，在电流设计中二十五。用于使用烧结微纤维吸附剂的集体保护的板和框架罐可用于温度波动吸附循环，以降低建筑物保护的总成本。

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