Down-flow type fluidized bed flocculating settling device

Abstract

The invention provides a down-flow type fluidized bed flocculating settling device. The down-flow type fluidized bed flocculating settling device comprises a flocculating unit, a settling tank and anoverflow water collecting tank, wherein the flocculating unit is arranged at the center of the settling tank; the top part of the settling tank is externally connected with the overflow water collecting tank; the flocculating unit comprises a water distribution funnel, a water distribution grid and a down-flow type fluidized flocculating reaction bed which are sequentially arranged in series fromtop to bottom; the water flow in the down-flow type fluidized flocculating reaction bed flows from top to bottom; the particles of which the densities are different and are lower than the density of water are mixed and arranged in the bed layer. The down-flow type fluidized bed flocculating settling device has the advantages that in the flocculating settling process, the eddy required by the flocculating can be provided by the mixed and arranged low-density particles, the water flow speed gradient can be adjusted, and the floccule can quickly grow; because the settling directions of the waterflow and the particles are uniform, the easiness in mixing return of the floccule particles is avoided, the shearing and crushing of the fluid on the floccule can be effectively reduced, the flocculecan timely settle after penetrating through the bed layer, and the settling efficiency is improved.

Description

technical field [0001] The invention relates to a downflow fluidized bed flocculation and sedimentation device, which is suitable for the field of water treatment, especially for coal slime water flocculation and sedimentation of tailing coal in a coal preparation plant. Background technique [0002] The flocculation and sedimentation of particles has two important factors, one is the agent factor, and the other is the fluid environment. Reasonable selection and appropriate use of agents are the decisive factors for the flocculation of fine particles, and a suitable fluid environment is to form large flocs and achieve high efficiency. The key factor of flocculation sedimentation. [0003] Flocculation dynamics theory and experimental research have shown that the fluid flow state has an important influence on the flocculation of particles. The fluid shear rate and particle residence time determine the growth characteristics of flocs. The large flocs are quickly flocculated i...

AI Technical Summary

Problems solved by technology

It can be seen from its documents that in the conventional fluidized bed provided by this technology, the water flows from bottom to top, and once the particles form large flocs, they will settle down. In the opposite direction of the water flow, there is a possibility of back mixing and causing the flocs to break. Possibly, in addition, in this technology, the particle size of the filling particles gradually decreases along the direction of water flow. Therefore, the wake vortex of the fluidized filling particles also decreases, and the flocs should grow gradually along the direction of water flow. Synergy, which does not match the requirements of vortex scale and floc scale in the theory of flocculation kinetics

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