气尘气溶胶吹扫时水平碘空气过滤器中分散性小煤尘粒子浓度密度极大值的产生
Generation of concentration density maxima of small dispersive coal dust particles in horizontal iodine air filter at air-dust aerosol blow
摘要：
研究了核电厂卧式碘空气过滤器长期运行过程中，吸收器内圆柱形煤颗粒过滤介质中分散的纳米级和微米级小煤尘颗粒的空间分布。结果表明，在空气粉尘气溶胶吹扫的作用下，在卧式碘空气过滤器中具有圆柱形煤吸附剂颗粒的颗粒过滤介质中，分散的小煤尘颗粒的浓度密度出现极大值。对卧式和立式碘空气过滤器的空气阻力进行了测量比较。主要结论是，在相同的空气粉尘气溶胶体积负荷下，水平碘空气过滤器的空气动力学阻力的大小比垂直碘空气过滤器的空气动力学阻力的大小小得多。说明了空气粉尘气溶胶的吹送方向与卧式碘空气过滤器内重力方向正交，从而使分散的小煤尘颗粒在卧式碘空气过滤器内的吸收塔底部发生有效聚集。在核电厂碘空气过滤器长期运行过程中发现，与立式碘空气过滤器不同，卧式碘空气过滤器中的空气粉尘气溶胶流不受由分散的小煤粉颗粒沉淀而成的结构的限制。
英文摘要：
The spatial distributions of the small dispersive coal dust particles with the nano and micro sizes in the granular filtering medium with the cylindrical coal granules in the absorber in the horizontal iodine air filter during its long term operation at the nuclear power plant are researched. It is shown that the concentration density maxima of the small dispersive coal dust particles appear in the granular filtering medium with the cylindrical coal absorbent granules in the horizontal iodine air filter at an action by the air dust aerosol blow. The comparison of the measured aerodynamic resistances of the horizontal and vertical iodine air filters is conducted. The main conclusion is that the magnitude of the aerodynamic resistance of the horizontal iodine air filters is much smaller in comparison with the magnitude of the aerodynamic resistance of the vertical iodine air filters at the same loads of the air dust aerosol volumes. It is explained that the direction of the air dust aerosol blow and the direction of the gravitation force in the horizontal iodine air filter are orthogonal, hence the effective accumulation of the small dispersive coal dust particles takes place at the bottom of absorber in the horizontal iodine air filter. It is found that the air dust aerosol stream flow in the horizontal iodine air filter is not limited by the appearing structures, made of the precipitated small dispersive coal dust particles, in distinction from the vertical iodine air filter, in the process of long term operation of the iodine air filters at the nuclear power plant.
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