RAP fine material drying and heating equipment

Abstract

The invention provides RAP fine material drying and heating equipment. The RAP fine material drying and heating equipment is provided with a shell, a conveying assembly and a heating layer, wherein the conveying assembly and the heating layer are both arranged in the shell, and the heating layer is arranged at the bottom of the shell. The conveying assembly comprises a conveying chain and a plurality of scraper blades arranged on the conveying chain. A gap exists between the scraper blade piece and the heating layer, so that the RAP fine materials are independently heated, material conveying can be conducted while the fine materials are dried and heated, the efficiency is high, and therefore the adhesion problem existing in RAP thermal regeneration of a traditional roller is solved. In addition, by arranging the scraper blades, the materials are spread along the bottom plate while being pushed to move forwards, so that the heating and evaporation area is increased, and the heating efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a RAP fine material drying and heating equipment. Background technique [0002] In the existing thermal regeneration technology of asphalt mixture, the thermal regeneration of RAP mainly adopts a drying system composed of a burner system and a drying drum to dry and heat RAP and then mix it with new material to obtain RAP asphalt mixture. During the process, due to the different particle sizes and the huge difference in specific surface area, the heating of materials with different particle sizes in the same heating environment is uneven, resulting in the fact that when the fine materials are heated to the required temperature, the coarse materials are far from reaching the required temperature. ; or when the coarse material is heated to the desired temperature, the asphalt in the fine material is scorched and aged to lose its function. At the same time, the a...

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Problems solved by technology

[0002] In the existing thermal regeneration technology of asphalt mixture, the thermal regeneration of RAP mainly adopts a drying system composed of a burner system and a drying drum to dry and heat RAP and then mix it with new material to obtain RAP asphalt mixture. During the process, due to the different particle sizes and the huge difference in specific surface area, the heating of materials with different particle sizes in the same heating environment is uneven, resulting in the fact that when the fine materials are heated to the required temperature, the coarse materials are far from reaching the required temperature. ; or when the coarse material is heated to the required temperature, the asphalt in the fine material is scorched and aged and loses its function

At the same time, the asphalt content in the fine particles is high, after heating and softening, it is not only easy to stick to the drum, which affects the normal use of the drying drum, but also easy to stick to the conveying equipment

[0003] At present, when RAP coarse material and fine material are thermally regenerated together, in order to prevent adhesion to the drum, flexible chains are usually used as drum blades, but this method has the problem of low heating efficiency

[0004] Therefore, there is a need for a RAP fine material drying and heating equipment, which can solve the adhesion problem of traditional drums during RAP thermal regeneration, and has high heating efficiency

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