粒径对粉体类暖云雾消除剂消雾效果的影响研究
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- 英文论文题名：Study of Eliminating Effects on Powder based Warm-fog Eliminator by Controlling Particle Size
- 论文作者：刘香翠 ; 刘清海 ; 代梦艳 ; 史卫东 ; 方国峰
- 英文论文作者：Xiangcui Liu ; Qinghai Liu ; Mengyan Dai ; Weidong Shi ; Guofeng Fang ; Research Institute of Chemical Defence
- 年：2016
- 作者机构：防化研究院;
- 论文关键词：粒径 ; 粉体 ; 暖云雾 ; 消除
- 英文论文关键词：particle size ; powder ; warm-fog ; elimination
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十四分会：公共安全化学
- 语种：中文
- 分类号：TQ421
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十四分会 ; 公共安全化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：236k
- 原文格式：D
- 会议级别：全国
摘要
将经吸湿性能实验筛选出的某吸湿性盐与2%纳米疏水白炭黑机械混合后,采用多种粉碎设备将混合物粉碎成不同粒径范围的粉体,真空干燥后密封备用;利用马尔文激光粒度仪干法分散模式测试了各个样品的粒径范围;在50m~3暖云雾实验室内造雾,采用高压旋流分散装置分别将不同粒径范围的样品喷入暖云雾中,对比研究了其对暖云雾的消除效果。结果表明,若消雾剂样品粒度太小(如D_(90)小于10μm),刚开始喷入暖云雾中时,反而会使得雾气变浓,可见光透过率变小,起到了造雾的作用,消雾效果不好;若消雾剂样品粒度太大,则粒子沉降很快,不能充分吸收雾气,消雾效果也不好;只有消雾剂粒径大小合适(如D_(50)在20μm左右最合适),才能起到良好的消雾效果。最后,简要描述了消雾原理,主要是吸湿凝结和重力碰并两种机制。
The specifically selected hygroscopic salts and hydrophobic nano-silica are mixedmechanically, pulverized into varies of powders with different particle sizes by grinders and dried in vacuum for further use. The particle sizes of powders are measured by Malvern laser particle size analyzer. Fog is formed in a 50 m~3 cloud chamber and then these eliminators, powders in different sizes, are sprayed into the chamber by high pressure swirl dispersal device to eliminate the fog. The results show that when the particle sizes of eliminators are too small(D_(90) <10μm), the spray of particles strengthens the fog and reduces the light transmission; when the particle sizes of eliminators are too large, the sprayed particles are easy to aggregate and subside; only when the particles are at the appropriate size(D_(50) ≈20μm), the eliminators can have best eliminating effects for the warm fog. In the end, the elimination theory of warm fog, which consists of hygroscopic condensation and gravitational coalescence is discussed.
The specifically selected hygroscopic salts and hydrophobic nano-silica are mixedmechanically, pulverized into varies of powders with different particle sizes by grinders and dried in vacuum for further use. The particle sizes of powders are measured by Malvern laser particle size analyzer. Fog is formed in a 50 m~3 cloud chamber and then these eliminators, powders in different sizes, are sprayed into the chamber by high pressure swirl dispersal device to eliminate the fog. The results show that when the particle sizes of eliminators are too small(D_(90) <10μm), the spray of particles strengthens the fog and reduces the light transmission; when the particle sizes of eliminators are too large, the sprayed particles are easy to aggregate and subside; only when the particles are at the appropriate size(D_(50) ≈20μm), the eliminators can have best eliminating effects for the warm fog. In the end, the elimination theory of warm fog, which consists of hygroscopic condensation and gravitational coalescence is discussed.
引文
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