Abstract:

The development of the gas-solids separator is crucial to the dust-collection for high-temperature flue gas. It was demonstrated that any separator with single-mechanism essentially cannot achieve a deep dedusting process. Therefore, coupling centrifugal separation and moving bed separation in the same equipment to achieve synergistic strengthening of the two separation mechanisms is undoubtedly a solution. The researches indicated that the moving/flow of the gas, the collecting particles and the dusts in both its outer cyclone shell and built-in moving bed present distinct characteristics comparing those in the commonly used cyclone separator and moving bed. It was also found that the coupling separator had the self-cleaning function by analyzing the measured pressure drop-time response curves. The collecting efficiency of the coupling separator reaches above 95% for fine dusts. The dusts larger than 10 μm are generally caught by the cyclone shell while those smaller than 10 μm are collected by the built-in granular bed. It was shown that the gas-solid separation was corporately strengthened by two different mechanisms in one equipment. However, the self-cleaning function and the collecting efficiency are actually a pair of contradictions. Moreover, the tentative optimal results showed that the coupling separator could be further improved in the future.

Key words: gas-solids separation, cyclone separator, moving bed filter, coupling, flow field, optimization

摘要：

气固分离装备的发展对于实现高温烟气的高效除尘净化具有重要意义。基于单一气固分离机制的除尘装备难以实现精细除尘的目标。将离心分离和移动床分离耦合在同一装备中，实现两种分离机制的协同强化无疑是一种解决方案。在该耦合装备中，旋风壳体和移动床内气相、捕集颗粒、粉尘的运动较之常规单体旋风分离器、移动床均具有一些独特的特性。通过压降-时间响应曲线发现该新型耦合分离装备具有自清洁功能。该装备对黏附性微细粉尘的捕集效率在95%以上；旋风壳体分离了10 μm以上颗粒物，而内置颗粒床捕集到的粉尘粒径在10 μm以下，验证了二者在同一装备中的协同强化。但是，强化自清洁效应和提高捕集效率构成了一对矛盾。研究表明，该新型耦合分离装备仍具有很大的性能提升空间。

关键词: 气固分离, 旋风分离器, 移动床过滤器, 耦合, 流场, 优化