收尘极板上沉降粉尘粘结性能研究

Study on coherence properties of precipitated dust on collecting electrode

振打清灰效果不好,严重影响电除尘器的除尘效率和使用范围,而影响振打清灰效果的最主要因素是沉降粉体的粘结力。通过建立数学模型从微观的角度推导出粉尘之间各种粘结力的理论计算公式。分析了比电阻、外加电场和粉尘含水率等因素对粉尘粘结力的影响。在实验中,模拟电除尘器中的静电场,测出在不同外加电场下粉尘粘结力的大小,定量的反应了外加电场对粉尘粘结性能的影响。

The bad rapping effect seriously affects the efficiency and the applied scope of electrostatic precipitators, while the cohesive force of precipitated dust is the most important factor, which affects the rapping. In order to clarify the problem, the theoretical equation of Vande Waals force, adhesive force and electrostatic force between particles from microcosmic aspect are derived by setting up a mathematical model in thesis. We analyse the factors such as dust resistively, the applied electric field and dust water ration which affect the dust cohesive force. In experiments, by simulating the electrostatic field in electrostatic precipitators the magnitude of the cohesive force of dust in different applied electric field is measured, which quantitatively reflects the influence of the electric field on the cohesive force of dust .