JP3459222B2 - Asphalt mixture production equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt pavement waste material (hereinafter referred to as "waste material") and a manufacturing facility for producing an asphalt mixture from a new material, and in particular, it removes odor generated from a waste material dryer to improve the environment. The present invention relates to an asphalt mixture manufacturing facility adapted to.

[0002]

2. Description of the Related Art In an asphalt manufacturing facility, in addition to the manufacture of a new material from an aggregate, the manufacturing of an asphalt mixture which reuses a waste material has been conventionally performed. A waste material dryer and a new material dryer for heating by a burner are installed in the asphalt mixture manufacturing facility, and the waste material and the new material are respectively heated and collected as a solid content.

In the operation of a new material dryer, dust is generated because the new material is only heated. On the other hand, when the waste material with the asphalt content is heated by the waste material dryer, blue smoke is generated. This blue smoke is an oil with a bad odor, and if it is exhausted from the flue as exhaust gas, it adversely affects the surrounding environment. Also, regarding the new material dryer, the odor of the unburned gas generated during ignition and extinguishing of the burner is generated, and the effect on the environment cannot be ignored.

As a structure for removing the odor of such unpleasant oil and oil having an offensive odor, for example, Japanese Patent Laid-Open No. Hei.
-263401. This is configured such that a spray nozzle for spraying a vegetable essential oil is provided in the flue and the amount of the essential oil sprayed is changed according to the strength of the odor. If such essential oil spraying is performed, the aroma of the vegetable essential oil becomes stronger than the malodorous component, and the malodor can be masked. Further, since these vegetable essential oils have a sensory neutralizing action against malodor, it is possible to neutralize malodorous components and weaken the extent of malodor.

[0005]

However, since deodorization by vegetable essential oil utilizes its aroma or neutralizes it sensuously, it is difficult to biochemically decompose and eliminate the odor. Further, since the remaining components of the vegetable oil are discharged from the flue, the exhaust gas also contains oil, which is not preferable in terms of environmental purification.

[0006] Therefore, an object of the present invention is to provide an asphalt mixture manufacturing facility capable of removing odor almost completely by utilizing bacteria having a deodorizing function.

[0007]

DISCLOSURE OF THE INVENTION The present invention is an asphalt mixture manufacturing facility having at least a waste material dryer and a flue channel to which exhaust gas from the waste material dryer is supplied. A deodorizing chamber in which a deodorizing liquid containing bacteria is sprayed is provided, and a cooling zone for lowering the temperature of the exhaust gas to a degree not killing the bacteria is provided on the upstream side of the exhaust gas flow path from the deodorizing chamber. It is characterized by being

According to the present invention, even if the exhaust gas is at a high temperature, the temperature is lowered to the extent that the bacteria are not killed on the upstream side of the deodorization chamber, so that the odor in the exhaust gas can be eliminated by the biological deodorization method using bacteria.

In the present invention, the cooling zone is formed inside the flue and is connected to an exhaust gas flow path from the waste material dryer, and a lower end side formed as an annular cross section around the introduction path. Can be configured by a confluent area with the suction passage opened to the outside.

In such a structure, the temperature of the exhaust gas can be lowered by mixing the ambient temperature air from the outside with the exhaust gas, so that the odor in the exhaust gas can be eliminated by the bacteria. Further, since ambient temperature air from the outside can be supplied by the ejector effect by the exhaust gas flow from the draft of the flue and the introduction path, no equipment such as a fan or a compressor is required.

Further, the cooling zone may be constructed as a cooling area by a spray header arranged in the flue and spraying water.

In such a structure, the temperature of the exhaust gas can be lowered by spraying water from the spray header, so that the odor in the exhaust gas can be eliminated by the bacteria.
Moreover, since the temperature of the exhaust gas can be appropriately controlled by adjusting the supply flow rate of water, it is possible to enhance the deodorizing effect of bacteria.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an asphalt mixture manufacturing facility according to an embodiment of the present invention.

In the figure, a new material dryer 1 directly connected to the burner 1a and a waste material dryer 2 similarly directly connected to the burner 2a are arranged. The new material drier 1 and the waste material drier 2 each have the same structure. As is well known, a rotating cylindrical drier is provided with a raking blade, and hot hoppers provided on the side of the burners 1a and 2a are connected to aggregates and Waste material is charged and heated, and the heated asphalt material is recovered from the cold hopper provided at the end opposite to the burners 1a and 2a.

A bag filter 3 for collecting dust is connected to each of the new material drier 1 and the waste material drier 2 via an exhaust gas flow path, and an exhaust fan 4 is provided downstream of the bag filter 3.
Are connected. By the exhaust fan 4, exhaust gas containing an offensive odor generated in the new material drier 1 and the waste material drier 2 by heating is sucked, and dust contained in the exhaust gas is collected and removed by the bag filter 3.

A flue 5 having a height capable of generating a draft is connected downstream of the exhaust fan 4. This flue 5 is an exhaust fan 4
To the intake passage 5a, a suction passage 5b formed in an annular cross-section around the introduction passage 5a and having a portion corresponding to the lower end of the smoke passage 5 opened to the outside, and the suction passage 5a and the suction passage 5a. Deodorization chamber 5 formed above the path 5b
c and a filter portion 5d arranged above the deodorization chamber 5c to reduce the amount of smoke emitted. The exhaust gas supplied from the blower 4 is introduced into the introduction path 5a.
Through the deodorizing chamber 5c through the filter unit 5
It is discharged from d. Then, due to the draft of the upward air flow passing through the deodorization chamber 5c and the filter portion 5d from the introduction path 5a, air is sucked from the outside into the suction path 5b whose lower end is open, and the deodorization chamber 5
It merges with the exhaust gas from the introduction path 5a in c. Therefore, the exhaust gas flowing into the deodorization chamber 5c is diluted, and at the same time, the temperature of the gas inside the deodorization chamber 5c decreases due to the mixture with the ambient temperature air from the outside. In addition, flue 5
The outside air is sucked from the suction passage 5b not only by the draft but also by the ejector effect by the exhaust gas flow flowing into the deodorization chamber 5c from the upper end of the introduction passage 5a.

In the deodorizing chamber 5c, a plurality of nozzles 6 are arranged in an upper and lower two-stage arrangement, and a deodorizing liquid tank 8 is connected to these nozzles 6 via a pump 7. The deodorizing liquid tank 8 stores a bacterial liquid obtained by diluting bacteria of the genus Thiovalus or the genus Hyphomicrobium with an appropriate solvent such as water. Bacteria of the genus exemplified are known to convert odorous components into odorless substances by biochemical reactions. That is, when a bacterium comes into contact with an odorous component, the bacterium takes in the odorous component into the body and carbon, hydrogen, which are the elements constituting the odorous component,
By oxidizing nitrogen and sulfur, carbon dioxide, water, sulfate ions,
It can be converted to nitrate ions to eliminate odors.

In the above construction, when the new material drier 1 and the waste material drier 2 are operated, exhaust gas from the asphalt component is generated, and this exhaust gas is sucked toward the flue 5 side by the exhaust fan 4. The amount of exhaust gas from the new material dryer 1 is negligible, and most of it is occupied by the exhaust gas from the waste material dryer 2. When the exhaust gas is sucked, by passing through the bag filter 3,
The dust mainly contained in the exhaust gas from the new material dryer 1 is collected.

The exhaust fan 4 introduces the exhaust gas into the flue 5 through the introduction path 5
a, exhaust gas flows into the deodorization chamber 5c from the upper end of the introduction path 5a, and the filter portion 5d is drafted.
Rises and is released. At the same time, due to the ejector effect of the draft in the flue 5 and the exhaust gas flow discharged from the introduction path 5a, the outside normal temperature air is sucked into the suction path 5a.
It is sucked from the lower end of b and sent to the deodorizing chamber 5c.

Here, the temperature of the exhaust gas from the new material drier 1 and the waste material drier 2 is about 100 ° C. to 110 ° C., and the temperature at which the air and the exhaust gas are mixed by mixing with the room temperature air in the deodorization chamber 5c. Can be lowered to about 60 ° C. In order to set such a temperature, it suffices that the flow passage areas of the introduction passage 5a and the suction passage 5b have an appropriate relationship, and the flow rate ratios of the exhaust gas and the room temperature air are adjusted. Is possible by.

On the other hand, the deodorizing liquid containing bacteria stored in the deodorizing liquid tank 8 is supplied to the nozzle 6 via the pump 7 and ejected from the nozzle 6. That is, the deodorizing liquid is sprayed into the deodorizing chamber 5c by a scrubber system in which the liquid containing bacteria is dropped from the nozzle 6 like a shower. At this time, since the room temperature air is mixed with the exhaust gas in the deodorization chamber 5c and the temperature is lowered to about 60 ° C.,
Bacteria contained in the deodorant solution are not killed.

Thus, in the deodorization chamber 5c,
When the bacteria contained in the deodorizing liquid come into contact with the exhaust gas diluted with room temperature air, the odorous components in the exhaust gas are taken into the body of the bacteria and deodorized as described above. At the time of deodorization by the bacteria, the air blown from the introduction portion 5a is diluted with the suction air from the suction passage 5b in the deodorization chamber, so that the deodorization effect can be enhanced.
Therefore, the air-fuel mixture of the exhaust gas and the room temperature air has no odor and is discharged from the filter portion 5d.

The external air supplied to lower the temperature of the exhaust gas can be sucked by utilizing the ejector effect of the exhaust gas discharged from the draft of the flue 5 and the introduction path 5a. Therefore, a simple facility can be provided without the need for a fan, a compressor, or the like for blowing in room temperature air.

FIG. 2 is a schematic view of an asphalt mixture manufacturing facility showing another embodiment. The same components as those shown in FIG. 1 are designated by common reference numerals, and detailed description thereof will be omitted.

In the figure, a spray header 9 for spraying water is arranged in the flue 5 and below the deodorizing chamber 5c. The spray header 9 is connected via a pump 11 to a water tank 10 arranged outside the flue 5, and a recovery path 12 is provided between the lower end of the flue 5 and the water tank 10.

In such a structure, the exhaust fan 4 to the flue 5
The exhaust gas supplied therein is cooled by water spray from the spray header 9. By appropriately setting the flow rate of sprinkling water from the spray header 9 with respect to the exhaust gas flow rate, the exhaust gas at about 100 ° C. to 110 ° C. can be lowered to about 60 ° C. and sent to the deodorization chamber 5c. Therefore, the odorous component contained in the deodorizing liquid from the nozzle 6 can be removed without dying, and the odorous gas can be released from the filter section as an odorless gas.

As described above, according to the present invention, the internal temperature of the deodorizing chamber 5c in the flue 5 is adjusted to a temperature at which bacteria contained in the deodorizing liquid are not killed. Deodorization becomes possible. Therefore, the flue 5
The exhaust gas emitted from the equipment does not contain odors and can be provided as environment-friendly equipment.

[0028]

According to the present invention, even if the exhaust gas from the waste material dryer is at a high temperature, the temperature of the exhaust gas is lowered by the cooling zone on the upstream side of the deodorization chamber to the extent that bacteria are not killed. Odor can be reliably removed. Therefore, odorless exhaust gas can be discharged from the flue, and operation can be performed without causing environmental pollution.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an asphalt mixture manufacturing facility showing an embodiment of the present invention.

FIG. 2 is a schematic view of an asphalt mixture manufacturing facility showing another embodiment of the present invention.

[Explanation of symbols]

1 New material dryer 1a burner 2 Waste material dryer 2a burner 4 blower 5 flue 5a Introduction 5b suction path 5c deodorization chamber 5d filter section 6 nozzles 7 pumps 8 Deodorizing liquid tank 9 spray header 10 aquarium 11 pumps 12 Collection route

Claims (3)

(57) [Claims] 1. In an asphalt mixture manufacturing facility comprising at least a waste material dryer and a flue to which exhaust gas from the waste material dryer is supplied, a deodorizing liquid containing deodorant bacteria is sprayed into the flue. And a cooling zone for lowering the temperature of the exhaust gas to such an extent that the bacteria are not killed, on the upstream side of the exhaust gas flow path from the deodorization chamber. Material manufacturing equipment. 2. The cooling zone is formed inside the flue and is connected to an exhaust gas flow path from the waste material drier, and the cooling zone is formed as an annular cross section around the introduction path and the lower end side is outside. The asphalt mixture manufacturing facility according to claim 1, wherein the facility is constituted by a confluent area with an open suction passage. 3. The asphalt mix manufacturing facility according to claim 1, wherein the cooling zone is a cooling area provided by a spray header disposed in the flue and spraying water.