Waste heat utilization device of asphalt mixture mixing plant

Abstract

Disclosed is a waste heat utilization device of an asphalt mixture mixing plant. The waste heat utilization device comprises a high-temperature drying barrel. One end of the high-temperature drying barrel is connected with a waste heat drying barrel through a material passing groove. A feeding box is mounted at the end of the waste heat drying barrel. The feeding box is connected with a cold material hopper through a belt conveyor. A filtering device is mounted at the top of the feeding box. The high-temperature drying barrel and the waste heat drying barrel are further connected through a transition flue duct. A discharging box is mounted at the other end of the high-temperature drying barrel. The discharging box is connected with an elevator through a discharging pipe. A burner is mounted at the end of the high-temperature drying barrel. An air waste heat box is mounted at the top of the high-temperature drying barrel. The top of the air waste heat box is connected with a high-temperature induced draft fan through an entering pipe. The high-temperature induced draft fan is connected with the transition flue duct through an output pipe. The waste heat utilization device is compactin structure, reasonable and convenient to operate, raw materials are preheated through waste heat generated by heating aggregates, the working reliability is good, heat is fully utilized, and energyloss cannot be caused.

Description

technical field [0001] The invention relates to the technical field of asphalt mixing plants, in particular to a waste heat utilization device of an asphalt mixing plant. Background technique [0002] The general aggregate drying method of asphalt mixing plant is flame heating, and the aggregate drying and heating process adopts the counter-current type (the flame and the dried and heated aggregate move in reverse), which is divided into aggregate and its components. There are three stages of preheating with moisture, aggregate drying (water evaporation) and aggregate heating. The aggregate moves rapidly from the low temperature area to the high temperature area. During the moving process, the aggregate is lifted and freed by the blades inside the drum for many times. Scatter and achieve uniform dispersion, so that the aggregate and high-temperature flue gas are fully contacted for heat exchange. In order to fully burn the fuel, the high-temperature flue gas forms convection...

AI Technical Summary

Problems solved by technology

[0002] The general aggregate drying method of asphalt mixing plant is flame heating, and the aggregate drying and heating process adopts the counter-current type (the flame and the dried and heated aggregate move in reverse), which is divided into aggregate and its components. There are three stages of preheating with moisture, aggregate drying (water evaporation) and aggregate heating. The aggregate moves rapidly from the low temperature area to the high temperature area. During the moving process, the aggregate is lifted and freed by the blades inside the drum for many times. Scatter and achieve uniform dispersion, so that the aggregate and high-temperature flue gas are fully contacted for heat exchange. In order to fully burn the fuel, the high-temperature flue gas forms convection and radiation. The medium-temperature flue gas filtered by the dust collector is discharged. At the same time, part of the heat generated in the high-temperature zone of the flame is dissipated in the surrounding atmosphere through the outer wall of the drying cylinder, which cannot make full use of the heat, resulting in energy loss.

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