Research on agglomeration characteristics of medium particles in dense gas-solid separation fluidized bed
To master the agglomeration characteristics of medium particles and provide guidance for achieving a uniform and stable fluidized bed,this paper investigated the apparent viscosity of 0～300μm medium particles after fluidization under varying moisture conditions and studied the influence of coal external water content and medium particle size on particle agglomeration characteristics.The results demonstrate that higher moisture content and finer particle size lead to increased apparent viscosity,while an increase in shear rate gradually reduces the apparent viscosity.With the increase of moisture contents,similar agglomeration processes are observed for particles of various sizes.Specifically,stable agglomeration was achieved at moisture contents of 0.75%,1.0%,and 1.25%for particles sized 0～74μm,74～150μm,and 150～300μm respectively,indicating that smaller particles require lower moisture contents for stable agglomeration formation.Furthermore,higher moisture content leads to larger agglomerate size,while smaller particle size results in a wider distribution span of agglomerate sizes.Notably,at a moisture content of 1.75%,there was significant growth in the size of binary weighted particle aggregates after coal powder mixing along with a narrow distribution span;indicating that binary weighted particle aggregation exhibits less sensitivity towards changes in moisture contents.
万方数据
维普
