JPH07299325A - Apparatus for purifying car exhaust gas and method therefor - Google Patents

Abstract

PURPOSE:To arrange a purifying apparatus along a principal road or in the vicinity of a crossing to achieve the purification of car exhaust gas by sending the exhaust gas of a car into a box body having air suction and discharge ports and removing suspended dust by the org. adsorbent bed built in the box body while removing nitrogen oxide by a soil bed. CONSTITUTION:An air suction port 3 is provided to one surface of a box body 1 and an exhaust port 4 is provided to the opposite surface thereof and, further, a fan sending the exhaust gas of a car into the air suction port 3 is provided. A filter bed 15 filtering suspended dust in exhaust gas is provided on the side of the air suction port 3 of the box body 1 and a spoil bed 17 containing bacteria decomposing nitrogen oxide in exhaust gas is provided on the side of the exhaust port 4. The opening 6 and lid 7 for attaching and detaching both beds are provided to the top plate of a concrete block. The box body 1 is arranged along a principal road or in the vicinity of a crossing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus and a purifying method for exhaust gas discharged from a gasoline automobile, a diesel automobile or the like.

[0002]

2. Description of the Related Art Carbon monoxide,
It contains nitrogen oxides, airborne dust, and hydrocarbons, and when sunlight (ultraviolet rays) acts on a mixture of nitrogen oxides and hydrocarbons, it causes photochemical smog, which can cause respiratory distress and other disorders. Moreover, it has been pointed out that a large amount of suspended dust is contained in diesel exhaust gas and has a carcinogenic effect. Therefore, such harmful substances should be removed as much as possible, but after exhaust gas is exhausted from automobiles, it quickly diffuses into the atmosphere and the concentration of harmful substances becomes low, resulting in poor treatment efficiency. It is difficult to process. Therefore, conventionally, harmful substances have been exhausted as much as possible by adding exhaust gas regulations to an exhaust gas generation source, that is, an automobile.

However, since such regulations are limited, some cities have the following purification facilities. This purification facility is, for example, 10 meters vertically and 20 meters thick.
A plurality of cm non-woven fabrics (geotextiles) made of synthetic fibers for civil engineering are buried underground in a flat surface, and air containing exhaust gas sucked from the road is sent to this by a large fan, and floating dust is generated. The filtration is performed with a non-woven fabric, and the exhaust gas after filtration is sent to the soil layer above the non-woven fabric to decompose and remove nitrogen oxides with bacteria in the soil.

[0004]

However, in the above-mentioned facilities and methods, it is necessary to secure a large site, and a building is built above the purification facility in order to return the exhaust gas after treatment to the atmosphere. I can't. Moreover, it is difficult to secure such a site in urban areas where the concentration of suspended dust is high and photochemical smog is likely to occur. Further, there is a problem that the facility is large, installation work is troublesome, and maintenance inspection is difficult.

On the other hand, the concentration of automobile exhaust gas is high in a region where a large amount of automobiles pass and where buildings are built up, that is, along main roads and near intersections. It is obvious that if the exhaust gas can be processed before being diffused into the atmosphere, the efficiency of processing the exhaust gas can be improved, but such a purification device has not been known yet.

[0006] It is an object of the present invention to provide a purification device which can be easily installed near main roads and near intersections, does not require a large site, and is small in size and easy to inspect and maintain.

[0007]

The purifying apparatus of the present invention comprises a box 1 having an intake port 3 and an exhaust port 4. The box body 1 is provided with a fan 2 for sending exhaust gas discharged from the automobile to an intake port 3, and an organic adsorbent layer 15 for filtering suspended dust in the exhaust gas is provided on the intake port side of the box body 1. A built-in soil layer 17 in which bacteria decomposing nitrogen oxides in the exhaust gas inhabit is built in the exhaust port 4 side.

The box 1 is preferably manufactured from a concrete block narrower than the sidewalk or median strip. If the top plate 5 of the concrete block is provided with the opening 6 for loading and unloading the organic adsorbent layer 15 and the soil layer 17 where bacteria inhabit, and the lid 7 fitted in the opening 6 in a honey structure,
Maintenance and inspection becomes easy. A filter net 14 for removing coarse dust may be provided upstream of the organic adsorbent layer 15, and the inorganic adsorbent layer 16 may be interposed between the organic adsorbent layer 15 and the soil layer 17 where bacteria inhabit. it can. As the organic adsorbent, a material in which coconut husk fibers or synthetic fibers are roughly entangled and a material in which they are tightly entangled can be joined and used. The inorganic adsorbent layer is preferably a porous material such as activated carbon or unglazed clay.

According to the purification method of the present invention, a concrete block box body 1 having an organic adsorbent layer 15 and a soil layer 17 inhabiting bacteria is embedded in a sidewalk or a median strip, and a fan is placed in the box body 1. The vehicle exhaust gas is sent at 2, the floating dust is filtered by the organic adsorbent layer 15 built in the box body 1, and the nitrogen oxides are decomposed at the soil layer 17 where bacteria inhabit. A filter net 14 and an inorganic adsorbent layer 16 are attached to a concrete block box body 1 buried in a sidewalk or a median strip, and a fan 2 sends air containing exhaust gas of an automobile to the box body. A filter net 14 built in the box removes coarse dust in the air, an organic adsorbent layer 15 and an inorganic adsorbent layer 16 filter suspended dust, and a soil layer 17 inhabiting bacteria decomposes nitrogen oxides. .

[0010]

In the purifying device of the present invention, the exhaust gas discharged from the automobile is sent to the box 1 having the intake port 3 and the exhaust port 4, and the cleaning material contained in the box 1 is used as the purifying material to suspend suspended dust and nitrogen in the exhaust gas. Since it removes oxides, it can be easily installed along main roads and near intersections. If the box body 1 is made of a concrete block narrower than the sidewalk or the median strip, it can be buried in the sidewalk or the median strip, and the installation location can be easily secured.

If the lid 5 for maintenance and inspection is provided on the top plate 5 of the concrete block, the organic adsorbent layer 15 and the soil layer 17 in which bacteria inhabit can be regularly replaced.
A certain purification capacity can be secured. A filter net 14 is attached to the upstream side of the organic adsorbent layer 15 to remove coarse dust, and the organic adsorbent layer 15 and the soil layer 17 where bacteria inhabit.
By interposing the inorganic adsorbent layer 16 between and, it is possible to prevent clogging and maintain a more efficient purification treatment for a long time.

In the purification method of the present invention, the concrete block box body 1 having the organic adsorbent layer 15 and the soil layer 17 inhabiting bacteria is embedded in the sidewalk or the median strip, and near the box body. Since the air containing the generated automobile exhaust gas at a high concentration is sucked in by the fan 2 to remove the suspended dust and nitrogen oxides in the air, it is possible to treat the exhaust gas before it diffuses into the atmosphere. It is possible to maintain high processing efficiency. Furthermore, by attaching the filter net 14 and the inorganic adsorbent layer 16 to the box body, it is possible to remove coarse dust that causes clogging and maintain the processing capacity for a long time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention. The purifying apparatus of the present embodiment includes a box body 1 for containing a purifying material, and an electric fan 2 for sending air containing automobile exhaust gas into the box body 1. Box 1 has a wall thickness of 10 cm
And, it is formed by a rectangular concrete block having a length of 1 m, a width of 3 m, and a height of 1.5 m. A rectangular inlet port 3 is provided on the front face on the left side of the box body 1 in the figure, and an exhaust port 4 having a larger opening area than the inlet port 3 is provided on the other side face on the opposite side.
Is provided. The top plate 5 of the box body 1 is provided with three openings 6 in the longitudinal direction thereof, and a lid 7 having a honey structure is fitted in each opening 6. Two handles 8 are provided on the upper surface of each lid 7 with a distance of about the shoulder width of a person.

An L-shaped intake duct 9 is attached to the intake port 3, and the front end portion of this duct is formed wide so as to face the upper side of the box body 1 (the side of the roadway when installed). It is open. A large number of eaves-shaped horizontal rails 10 are installed in the openings to prevent rainwater from entering, and the electric fan 2 is built in behind the horizontal rails. A wide L-shaped exhaust duct 11 is connected to the exhaust port, and the tip of this duct is opened upward, and a cap 12 for preventing rainwater from entering is installed at a predetermined distance in the opening. There is.

FIG. 2 is a partially cutaway perspective view showing the internal structure of the box 1. The vacant chamber 13, the filter net 14, the filter layer 15, the ceramic ball layer 16 and the soil layer 17 in which bacteria inhabit are arranged in order from the intake port side. The filter layer 15, the ceramic ball layer 16 and the ceramic ball layer 16 are arranged. And perforated panel 1 between the soil layer 17 and the soil layer 17, respectively.
8 and 19 are fixed. The filter net 14 is an aluminum outer frame to which a metal net is attached. The filter net 14 is fitted into a guide groove provided on the inner wall surface of the box body 1, and can be attached and detached from the central opening 6. As shown in FIG. 3, the filter layer 15 is a 3 cm-thick non-woven fabric 25 in which coconut husk fibers are entangled with a fine filter cloth 26 and is used in three layers.

FIG. 4 is a perspective view showing a ceramic ball layer. The ceramic ball layer 16 is obtained by enclosing balls 27 having a particle size of about 1 mm to 3 mm, which is manufactured by calcination of clay in a bag 28 made of canvas.

The soil layer 17 inhabited by bacteria is shown in FIG. 5, and is a mat material 29 having a large thickness and a large porosity.
Soil 30 in which bacteria inhabit is placed on top of this, and this has a sandwich structure in which it is stacked in multiple stages. As the mat member 29, a nylon wire material 31 having a certain degree of rigidity may be irregularly bent and a thin non-woven fabric 32 is welded to one surface thereof. Soil on top of mat material 3
Zero is provided with a gap that allows exhaust gas to pass through.

FIG. 6 shows an example of use of the purifying apparatus of the present invention, in which the purifying apparatus of the present invention is installed on a sidewalk 34 of a main highway 33 where high-concentration automobile exhaust gas is generated. The intake duct 9 communicating with the intake port 3 is open to the road side. The electric fan 2 sends the air containing the exhaust gas discharged from the automobile into the box body 1 through the intake duct 9 together with coarse dust such as sand, dust and insects. Coarse dust is removed from the air sent into the box body by a filter net, and suspended dust such as diesel exhaust gas particulates (DEP) is adsorbed or filtered by the filter layer 15, and the ceramic ball layer 1
At 6, finer DEP is adsorbed, and nitrogen oxides are decomposed at the soil layer 17 where bacteria inhabit. Therefore, from the exhaust port 4 of the box body 1, exhaust gas containing a small amount of harmful substances such as carbon monoxide is discharged to the ground. Note that coarse dust such as insects caught on the filter net 14 falls due to gravity and accumulates on the bottom surface of the chamber 13.

In the purifying apparatus of the present embodiment, when continuously operated, dust and harmful substances are accumulated or trapped in the box body and the purifying ability is deteriorated. Therefore, the three lids 7 are opened periodically and accumulated on the bottom of the empty chamber 13. Coarse dust such as insects is removed by suction, and the filter mesh 14 and the ceramic ball layer 16 that have been clogged are replaced with new ones, and the dirty ones are washed and reused.
The filter layer 15 is replaced with a new one, and the dirty one is discarded. The soil layer 17 in which the bacteria inhabit is replaced with a new one or activated by spraying an activator from the opening 6 on the exhaust side.

FIG. 7 shows a second embodiment of the purifying device of the present invention. In the purifying apparatus of this embodiment, the box body 1 is made of stainless steel and three side openings 6 for maintenance and inspection are provided on the side surface of the box body 1. The opening 6 is a door which is opened and closed by a hinge 36. 37 is provided. The intake port 3 is not provided with a duct, but is provided with a horizontal rail 10 for preventing intrusion of rainwater. The electric fan 39 for sending the exhaust gas to the box is built in the exhaust duct 11 connected to the exhaust port.

The purifying apparatus of this embodiment is used as part of the air conditioning equipment of a building built along a main highway. The box 1 is installed along the wall 38 of the building with the door 37 on the front side, and the open end of the exhaust duct 11 is connected to the air intake port 39 of the air conditioning equipment. Air-conditioning equipment takes in fresh outside air into the building while exchanging heat to keep the air inside the building clean. Cannot be achieved. Therefore, if the purifying device of the present invention is used as a standby facility for an air conditioning facility, the air sent into the building can be kept clean.

[0022]

As described above, since the air purification apparatus of the present invention is small, it is not necessary to secure a large site,
It can be easily installed in various places. Therefore, it can be easily installed near the main roads and intersections in major urban roads where the concentration of suspended dust is high and photochemical smog is likely to occur.

Further, since the exhaust gas can be installed near the source of exhaust gas, it can be processed before the automobile exhaust gas diffuses widely into the atmosphere, and the exhaust gas processing efficiency is dramatically improved. Furthermore, if an opening is provided in the box and the purifying material contained therein can be exchanged, there is an effect that a constant processing capacity can always be maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a cross-sectional perspective view of essential parts of the first embodiment.

FIG. 3 is a perspective view of a filter layer.

FIG. 4 is a perspective view of a ceramic ball layer.

[Fig. 5] Perspective view of the soil layer where bacteria inhabit.

FIG. 6 is a perspective view showing a usage state.

FIG. 7 is a perspective view showing a second embodiment and its usage state.

[Explanation of symbols]

 1 Box 2 Electric fan 3 Intake port 4 Exhaust port 5 Top plate 6 Opening 7 Lid 14 Filter net 15 Filter layer 16 Ceramic ball layer 17 Soil layer

Front page continuation (72) Inventor Yumei Hagiwara No. 36 Midorigaoka, Kanazawa, Ishikawa Prefecture

Claims (6)

[Claims] 1. Box body having an intake port (3) and an exhaust port (4)
This box is equipped with a fan (1), and the air containing the exhaust gas of the car is sent from the road side to the intake port (3).
(2) is attached, the organic adsorbent layer (15) that filters the suspended dust in the exhaust gas is built in on the intake side of the box, and the nitrogen oxides in the exhaust gas are on the exhaust side. A device for purifying automobile exhaust gas, characterized by having a built-in soil layer (17) in which decomposing bacteria live. 2. The exhaust gas purifying apparatus according to claim 1, wherein the box body (1) is made of a concrete block narrower than a sidewalk or a median strip. 3. An opening (6) for loading and unloading an organic adsorbent layer (15) and a soil layer (17) where bacteria inhabit the top plate (5) of a concrete block, and a water honey structure in this opening (6). 3. The vehicle exhaust gas purifying apparatus according to claim 2, further comprising a lid (7) fitted in. 4. An organic adsorbent layer (15) is provided with a filter net (14) for removing coarse dust on the upstream side of the organic adsorbent layer (15).
Layer of inorganic adsorbent between the soil layer where the bacteria inhabit (17)
(16) is interposed, Claim 1, 2 or 3 characterized by the above-mentioned.
The vehicle exhaust gas purification device described. 5. A concrete block box body containing an organic adsorbent layer (15) and a soil layer (17) inhabiting bacteria.
(1) is buried in the sidewalk or the median strip, and air containing automobile exhaust gas is sent to this box by the fan (2), and the organic adsorbent layer (15 ) Is used to filter and adsorb suspended dust, and nitrogen oxides are decomposed in the soil layer (17) where bacteria inhabit. 6. A concrete block box body (1) containing a filtration net (14), an organic adsorbent layer (15), an inorganic adsorbent layer (16) and a soil layer (17) inhabiting bacteria is walked through a sidewalk or It is buried in the median strip, the automobile exhaust gas is sent to the box body by the fan (2), and the coarse dust in the exhaust gas is removed by the filter net (14) built in the box body (1). A method for purifying automobile exhaust gas, characterized in that suspended dust is filtered and adsorbed by the adsorbent layer (15) and the inorganic adsorbent layer (16), and nitrogen oxides are decomposed by the soil layer (17) where bacteria inhabit. .