A kind of preparation method of rice husk charcoal model sand for dynamic bed sediment model test

Abstract

The invention discloses a preparation method of rice husk charcoal model sediment for a movable bed sediment model test. The method comprises the steps that rice husks are selected as raw materials and are carbonized through a kilning method and a destructive distillation method, the rice husk carbon is formed by carrying out destructive distillation and oxygen-free carbonization on the rice husk raw materials through a carbonizing machine at high temperature inside a kiln, and the temperature inside the kiln is controlled to range from 300 DEG C to 800 DEG C in the process; smashing and separation are carried out, and rice husk carbon particles with the diameter ranging from 0.05 mm to 0.8 mm are obtained; the rice husk carbon particles are soaked in a 1-5% detergent solution used as a dispersing agent for 3 h to 5 h and then cleaned, and then the rice husk charcoal model sediment is obtained. The rice husk charcoal model sediment is stable in physicochemical characteristic, good in movement and sediment transport characteristic, and lower in cost, the problems that in existing sediment physical model tests, usually-adopted wood bit model sediment is putrescible, existing composite sediment is high in cost, and the particle diameter cannot be smaller than 0.1 mm easily are solved, and new practical resources which are good in performance and low in cost are provided for sediment selection of the movable bed sediment model test.

Description

technical field [0001] The invention belongs to the technical field of dynamic bed sediment model tests for river coast simulation, and relates to a method for preparing rice husk charcoal model sand used for dynamic bed sediment model tests of hydraulic engineering, river engineering and port engineering. Background technique [0002] In the simulation of rivers and coasts or the dynamic bed physical model test of rivers, estuaries, coasts and waterway improvement projects, a basic material for simulating natural rivers, estuaries or coastal sediments is often called model sand, and the sand selected for the model is dynamic bed sediment. One of the key technologies of model design determines the accuracy of model tests and the reliability of results. At present, the traditional model sand mainly consists of sawdust, wood powder, coal dust, coal powder, bakelite powder, etc. This type of model sand has defects such as consolidation, shelling, foaming, mildew, refinement, an...

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of preparation method of rice husk charcoal model sand used in dynamic bed sediment model test, the model sand produced by this method has stable physical and chemical properties, good movement and sand transport properties, and lower cost, which solves the problem of At present, the wood chip model sand commonly used in the sediment physical model test is perishable, the existing synthetic sand is expensive, and the particle size is difficult to achieve below 0.1mm. It provides a cheap new resource for the selection of sand for the dynamic bed sediment model test.