JPH039241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for manufacturing asphalt mixture, which is a road paving material.

(b) Conventional technology In recent years, asphalt pavement waste material (hereinafter referred to as "waste material") dug up during road construction, etc. has come to be heated and recycled, and generally a predetermined amount of heated waste material is mixed into new asphalt mixture. There are many methods of reproducing the data.

Therefore, a recycling plant that heats and regenerates waste materials is installed alongside an asphalt plant that produces new asphalt mixture. This recycling plant consists of a system that is almost the same as the asphalt heating system, and includes a waste material dryer that heats the waste material, a cyclone dust collector that is the primary dust collector that captures the dust scattered from the dryer, and a secondary dust collector. Consists of a wet dust collector.

The problem when heating waste wood is that when the asphalt contained in the waste wood is heated, oil smoke, which is a volatile component, is generated in the exhaust gas, and when this oil smoke is released from the chimney along with the exhaust gas, the smoke becomes yellow. When the water vapor disappears on a clear day, it becomes pale and billowing smoke, which is called blue smoke, and it causes a foul odor in the vicinity and is a pollution problem that cannot be ignored. In order to suppress the amount of oil smoke generated, it is important not to overheat the waste material more than necessary, and various measures have been taken for waste material dryers in this regard.

(c) Problems to be solved by the invention As mentioned above, waste material dryers have been devised to minimize the amount of oil smoke generated, but as long as the waste material is heated, the generation of oil smoke cannot be completely eliminated. .

In addition, the dust collector that captures the dust scattered from the waste material dryer of Recycle Rant cannot use a bag filter that uses filter cloth due to the stickiness of the oil smoke contained in the exhaust gas, so a wet dust collector is used as a secondary dust collector. The asphalt plant is also equipped with a cyclone dust collector as a primary dust collector and a bag filter as a secondary dust collector, and thus it is uneconomical to have independent dust collectors in both plants.

In view of the above points, the present invention aims to remove oil smoke contained in exhaust gas from a recycling plant as much as possible, and to integrate the dust collectors of the recycling plant and the asphalt plant.

(d) Means for Solving Problems The present invention connects the exhaust flue 7 of the waste material dryer 1 of a recycling plant to the burner 10 side of the aggregate dryer 9 of an asphalt plant, so that the exhaust gas led out from the waste material dryer 1 is fed into the aggregate dryer 9 and passed through the aggregate dryer 9, and an exhaust flue 13 downstream of the aggregate dryer 9 is provided with a dust collector for collecting dust.

(E) Function When producing asphalt mixture, aggregate is supplied to the aggregate dryer 9, and waste material is supplied to the waste material dryer 1. At this time, in the waste material dryer 1, by heating the waste material containing asphalt, oil smoke, which is a volatile matter, is generated in the exhaust gas.
This exhaust gas passes through the exhaust flue 7 and is introduced into the burner 10 side of the aggregate dryer 9, and a part of the oil smoke in the exhaust gas is combusted by the flame of the burner 10.
While the oil smoke that could not be combusted is guided downstream, it collides with the aggregate rolling down in the aggregate dryer 9, and a part of it adheres to the aggregate due to the sticky nature of the oil smoke. Further, the oil smoke that could not adhere to the aggregate collides with the dust flying up inside the aggregate dryer 9, and the surface is coated and becomes non-adhesive dust. This non-adhesive dust passes through without adhering to the inner surface of the downstream exhaust flue 13, and the coarse part of the dust is collected by the cyclone dust collector which is the primary dust collector, and the fine part of the dust is divided by the bag filter which is the secondary dust collector. They are arrested.

(f) Example 1 is a waste material dryer for a recycling plant that heats waste material, and is of a rotary kiln type, in which a cylindrical drum with a large number of scraping blades 2 arranged around its inner periphery is rotatably tilted. It is pivoted and rotated at a predetermined speed by a drive device (not shown).
3 is a burner which forms a flame in a combustion chamber 4 and sends high-temperature gas into the waste material dryer 1, and at the same time inputs waste material via a conveyor 5 and rolls the waste material while being scraped up by scraping blades 2. While flowing down, the waste material is heated to a desired temperature and discharged from the discharge section 6.

Reference numeral 7 denotes an exhaust flue connected to the waste material dryer 1, and the exhaust flue 7 includes a fan 8 for sucking exhaust gas.
is provided. The exhaust flue 7 is branched and connected to the combustion chamber 4 of one waste material dryer 1, and a part of the exhaust gas is circulated to the combustion chamber 4 of the waste material dryer 1, mixed with combustion gas, and supplied into the waste material dryer 1. The temperature of the hot air is lowered to prevent the waste material from overheating. The other side of the branched flue 7 is connected to a hot hopper 11 on the burner 10 side of the aggregate dryer 9 of the known Asalto Plant.
The zero flame and the exhaust gas are brought into contact, and a part of the oil smoke in the exhaust gas is combusted. While the oil smoke that could not be combusted passes through the aggregate dryer 9 together with the combustion gas, it collides with the aggregate supplied via the conveyor 12 disposed at the other end of the aggregate dryer 9.
Due to the sticky nature of oil smoke, it adheres to aggregates and is reduced. Further, the oil smoke that could not adhere to the aggregates collides with the dust thrown up by the gas flow, and the surface is coated with the dust and becomes non-adhesive, and is led out of the aggregate dryer 9. The oil smoke that has become non-adhesive passes through the downstream flue 13 without adhering to it, and the cyclone dust collector 14 captures the coarse part of the dust in the exhaust gas, and the bag filter 15 captures the fine part of the dust. The purified gas is released into the atmosphere from the chimney 16.

As described above, in the present invention, the exhaust gas discharged from the waste material dryer 1 of the recycling plant is introduced into the aggregate dryer 9 of the asphalt plant, but when both plants are operated simultaneously, the aggregate dryer 9 of the asphalt plant is normally used. Since the capacity is lowered by reducing the amount of aggregate supplied to the asphalt plant, there is a margin in the amount of exhaust gas to be sucked in, and there is no problem in introducing the exhaust gas from the recycling plant into the aggregate dryer 9. The dust collection system can be used as is.

(E) Effect The present invention connects the exhaust flue 7 of the waste material dryer 1 of a recycling plant to the burner 10 side of the aggregate dryer 9 of an asphalt plant, and introduces the exhaust gas of the waste material dryer 1 into the aggregate dryer 9. Therefore, the oil smoke generated by heating the waste material in the waste material dryer 1 is sent to the aggregate dryer 9 together with the exhaust gas, and can be partially combusted by the flame of the burner 10, while some of the oil smoke that could not be combusted can be The oil smoke collides with the aggregates in the aggregate dryer 9 and adheres to the aggregates due to the stickiness of the oil smoke, so that it can be reduced. Furthermore, the oil smoke that cannot adhere to the aggregates collides with the dust flying up inside the aggregate dryer 9 and is coated, becoming non-adhesive and does not adhere to downstream equipment such as the flue 13. In addition, the bag filter 15, which could not be used conventionally due to the stickiness of oil smoke, can now trap the oil smoke, and the dust collector of an asphalt plant can be used as is, which has great economical benefits.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical schematic diagram of an embodiment of the device of the present invention. 1... Waste material dryer, 7... Exhaust flue, 9...
Aggregate dryer, 10... Burner, 11... Hot hopper, 13... Exhaust flue, 14... Cyclone dust collector, 15... Bag filter.

Claims (1)

[Claims] 1 Connect the exhaust flue of the waste material dryer of the recycling plant to the burner side of the aggregate dryer of the asphalt plant, send the exhaust gas derived from the waste material dryer to the aggregate dryer, and remove the waste gas from the waste gas while passing through the aggregate dryer. 1. An asphalt mixture manufacturing device characterized by being configured to burn oil smoke or make it adhere to aggregate.