Anti-aging equipment and method for a batch asphalt mixing plant

Abstract

The invention discloses anti-aging equipment and method for a batch-type asphalt mixing tower. The equipment comprises a blender whose inner top face is equipped with an oxygen content monitoring device and a gas pressure monitoring device. The bender is further connected with a material weighing machine, an asphalt weighing machine, an inert gas storing device, an inert gas recycling device and a gas-discharging pressure-reducing device. Inert gases such as nitrogen and carbon dioxide are sent into the sealed blender, so that the contact opportunity of asphalt and oxygen can be reduced, and the aims of increasing the internal gas pressure in the blender and reducing volatilization of light oil are achieved. The higher blending temperature and the longer blending time are achieved, so that mineral aggregate wrapping degree of the asphalt and the blending uniformity can be improved. The oxygen content and the gas pressure in the blender can be monitored, so that the filling amount of the inert gases can be reasonably controlled. An oxygen removing device in the inert gas recycling device can utilize fuel combustion in the device to remove oxygen and the inert gases recycled after the oxygen removing process are conveyed to the inert gas storing device through a pipeline.

Description

technical field [0001] The invention belongs to the technical field of road engineering equipment, and relates to an asphalt mixing plant, in particular to an anti-aging device and method for an intermittent asphalt mixing plant. Background technique [0002] During the mixing process of asphalt mixture, the asphalt is in the state of 5-15μm thick film and is mixed with the hot mineral material at a high temperature of 150°C-170°C. The high-quality oil volatilizes rapidly and reacts chemically with oxygen, which becomes the most severe stage of asphalt aging. According to measurements, after mixing, the penetration of No. 40 / 60 bitumen is reduced to 85% of that before mixing, and that of No. 60 / 80 bitumen is reduced to 80%. The aging occurred is almost equivalent to the aging of about 10 years in the state of use, which shows that the asphalt aging is serious during the mixing process. [0003] In order to reduce the aging of asphalt during the mixing process, on the one h...

AI Technical Summary

Problems solved by technology

Adding anti-aging agents and warm mixing agents are helpful to reduce the aging of asphalt during the mixing process, but they have not been applied on a large scale. On the one hand, the cost has increased a lot. more or less adverse effects

According to the thinking of the prior art, it is obviously difficult to solve the aging problem of asphalt in the mixing process well

[0004] Considering that the current mixing time is difficult to further shorten, the mixing temperature is difficult to further reduce, and the use of additives has other adverse effects. Apparatus and method to reduce aging of asphalt during heating and mixing

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