JP4700920B2 - Air purification system, tunnel with air purification system - Google Patents

Description

The present invention relates to an air purification system and a tunnel including the air purification system.

  Concerning the air quality in road tunnels, concentration standards for carbon monoxide and suspended particulate matter called SPM (suspended particulate matter) are established. Therefore, in order to keep the air quality in the road tunnel above the standard, methods such as dilution of carbon monoxide by a jet fan, SPM dust collection by an electric dust collector and use of a ventilation shaft as needed have been proposed. On the other hand, there is a movement to establish concentration standards for various other harmful substances.

As a conventional method of such air purification, in the purification method of contaminated air that purifies the contaminated air by passing through the soil layer, the contaminated air is subjected to light before passing through the soil layer. A method for purifying polluted air, characterized in that the nitric oxide in the polluted air is changed to nitrogen dioxide by passing through the portion where the photocatalyst exhibiting an oxidizing function is applied (Patent Document) 1) is proposed.
Further, the present invention includes an atmospheric pressure low-temperature plasma apparatus for decomposing volatile organic substances in exhaust gas, and activated carbon treatment means for adsorbing volatile organic substances remaining in the gas generated from the apparatus to the activated carbon. An exhaust gas treatment device (see Patent Document 2) has also been proposed.

Also, an anode electrode made of a porous material having a predetermined aperture ratio made of a metal having an ozone generation catalytic function is superimposed on one surface of the solid electrolyte membrane, and a cathode electrode made of a porous material having the same predetermined aperture ratio on the other surface. The anode side jacket and the cathode side jacket covering the anode electrode and the cathode electrode are respectively provided with a water inlet and a water outlet, the anode electrode and the cathode electrode are connected to a DC voltage power source, and the water inlet A water supply pipe is connected, and the water outlet of the anode side jacket is connected to an injection nozzle provided in a treatment tank through which air in the underground space such as the tunnel flows, and air treatment in the underground space such as the tunnel An apparatus (see Patent Document 3) has also been proposed.
JP-A-11-267461 JP 2001-149551 A JP-A-8-243338

  However, construction areas such as tunnels are shifting to the city center than before, and there are times when it becomes difficult to apply conventional air purification techniques. For example, assuming a tunnel that penetrates the underground of a densely populated residential area, a tunnel will be constructed in the deep underground to suppress the impact on the house, or the entrance of the ventilation shaft will not be provided near the house Therefore, it is necessary to construct a long ventilation shaft connecting from the depth to the ground, or construction of the ventilation shaft itself is difficult from the viewpoint of residents' feelings. On the other hand, if the ventilating shaft is extended to separate the vent shaft from the house in order to avoid such a situation, the construction cost and construction period will be increased. It tends to lead to deterioration.

Therefore, the present invention has been made in view of the above problems, and a main object thereof is to provide an air purification system that realizes efficient and reliable air purification without using a ventilation shaft, and a tunnel equipped with the air purification system. .

The air purification system of the present invention that solves the above problems is an air purification system that purifies the air in the tunnel,
The air in the tunnel that is installed in the space under the roadbed in the tunnel and sucked from the dust collection port provided in the roadbed is taken in via the first air intake path, and is suspended in the form of suspended particles. A first dust collector for removing material;
The second dust collector that takes in the air from which the suspended particulate matter has been removed by the first dust collector through the second air intake path, and removes the suspended particulate matter from the taken-in air, and the second dust collector. Air installed in a side tunnel provided in the extension direction of the tunnel, comprising a harmful substance removal device that removes harmful substances such as nitrogen compounds and carbon monoxide from primary treated air treated by a dust collector Purification equipment,
An air return path for returning the purified air treated by the harmful substance removing device to the sky inside the tunnel (first invention).

  According to a second invention, in the first invention, the dust collector is a filtration type dust collector that collects suspended particulate matter by allowing the air to be purified to pass through a filtration layer composed of a filter medium or the like. And

  According to a third invention, in the first or second invention, the harmful substance removing device includes a denitration device for detoxifying nitrogen oxides contained in the primary processing air.

  According to a fourth aspect, in the third aspect, the denitration apparatus includes a plasma generator capable of converting nitrogen monoxide into nitrogen dioxide and a nitrogen dioxide recovery body.

According to a fifth invention, in any one of the first to fourth inventions, a plurality of the dust collection ports are provided so as to be arranged in the extending direction of the tunnel .

6th invention is a tunnel provided with the air purification system which purifies the air inside a tunnel,
The air purification system includes:
The air in the tunnel that is installed in the space under the roadbed in the tunnel and sucked from the dust collection port provided on the side of the roadbed is taken in via the first air intake path, and the taken-in air A first dust collector that removes more suspended particulate matter;
The second dust collector that takes in the air from which the suspended particulate matter has been removed by the first dust collector through the second air intake path, and removes the suspended particulate matter from the taken-in air, and the second dust collector. Air installed in a side tunnel provided in the extension direction of the tunnel, comprising a harmful substance removal device that removes harmful substances such as nitrogen compounds and carbon monoxide from primary treated air treated by a dust collector Purification equipment,
An air return path for returning the purified air treated by the harmful substance removing apparatus to the sky inside the tunnel, and a tunnel having an air purification system.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the embodiments of the present invention and the drawings.

According to the present invention, in order to reduce the number of ventilation shafts that have been required in the past or to eliminate the need for construction of ventilation shafts, for example, in tunnels that penetrate deeply in densely populated residential areas in the city center. Even if it exists, the man-hour and cost at the time of construction | assembly of a long ventilation shaft and arrangement | positioning of a wellhead will be reduced, or it will not be assumed from the beginning. Therefore, tunnel construction itself can be made easier than before, and the cost and construction period of this construction can be reduced as compared with the conventional construction.
Therefore, it is possible to provide an air purification system that realizes efficient and reliable air purification without using a ventilation shaft, and a tunnel including the air purification system.

Reference examples and embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an application form of an air purification system in a reference example of the present invention to a vertical tunnel, and FIG. 2 is a diagram showing details of the air purification system in this reference example . The air purification system 100 in the present reference example is assumed to be provided in a deep underground tunnel that penetrates the basement 15 of the densely populated area 10, for example.

  This deep underground tunnel is a tunnel 200 with no shafts to clear the concentration standards for suspended particulate matter called carbon monoxide and SPM (suspended particulate matter), which are defined for air quality in road tunnels. It is a tunnel without a ventilation shaft. It should be noted that, in addition to the tunnel 200 of such a vertical shaft, for example, any object whose air circulation or air quality cannot be said to be good, such as a ground road with a high traffic volume or a parking lot (underground, aboveground, semi-underground). Even if it exists, application of the air purification system of this invention is possible. Moreover, the situation which reduces the installation number of the ventilation shaft required conventionally is applicable by applying the air purification system of this invention.

The air purification system 100 assuming this situation, in the outer periphery 202 of the tunnel wall 201, are installed an air purifying system 100 in the side road tunnel 204 provided in parallel to the extension direction of the tunnel in an empty 203.

  In addition, the air purification system 100 has an air intake path 101 for taking in air to be purified from the tunnel inner space 203 (predetermined space) in the tunnel 200, and air particles to be purified from the air to be purified guided from the air intake path 101. A dust collector 102 that removes substances, a harmful substance removal device 103 that removes harmful substances such as nitrogen compounds and carbon monoxide from the primary treatment air that has been treated by the dust collector 102, and a hazardous substance removal device 103. And an air return path 104 for returning the purified air to the tunnel interior 203 (predetermined space).

The air purification system 100 assuming this situation, in the outer periphery 202 of the tunnel wall 201, are Installation in the side road tunnel 204 provided in parallel to the extension direction of the tunnel in an empty 203.

  Next, the dust collector 102 provided in the air purification system 100 will be described. The dust collector 102 in the present embodiment is not an electric dust collector that has been generally used in the past, but a filtration dust collector that collects suspended particulate matter by passing the air to be purified through a filtration layer composed of a filter medium or the like. Can be. For example, if a plastic resin sintered body (eg, Sinter Lamella filter (registered trademark)) is employed as the filter medium, it is possible to achieve a compact filter dust collector.

The suspended particulate matter called SPM (suspended particulate matter) is contained in, for example, automobile exhaust gas, and is particularly liable to stay in a semi-closed space such as a tunnel. Therefore, the air in the tunnel, that is, the air to be purified, passes through a filtration layer composed of a filtering medium or the like in the filtration type dust collector that has been specially surface-treated (eg, generation of a protective layer to prevent clogging or chemical reaction). By doing so, SPM is collected. In addition, about removal of SPM collected by the filtration layer and adhering to the surface of a filter medium etc., it implements by instantaneous injection etc. of compressed air, for example, and it collects in a predetermined location. The collected SPM is kneaded and hardened in an appropriate solidifying agent and then discarded.

  The primary processing air from which the suspended particulate matter has been appropriately removed by the dust collector 102 described above is then subjected to processing by the harmful substance removing device 103. The harmful substance removal apparatus 103 may have a denitration apparatus that renders nitrogen oxides contained in the primary treatment air harmless.

The denitration apparatus in this reference example includes, for example, a plasma generator that generates radicals and ozone capable of converting nitric oxide into nitrogen dioxide and a nitrogen dioxide recovery body 108, and the radicals and ozone are converted into the primary treatment air. While making it contact, it produces | generates nitrogen dioxide, and the said nitrogen dioxide is collect | recovered or detoxified in the nitrogen dioxide collection body 108. The nitrogen dioxide recovery body 108 includes not only one that recovers / detoxifies only nitrogen dioxide but also one that recovers / detoxifies substances other than nitrogen dioxide.

  The radical is not particularly limited as long as it is a radical capable of converting nitric oxide into nitrogen dioxide. The plasma generator shown as generating the radicals and ozone is a device that generates so-called low temperature plasma. This low temperature plasma can be generated, for example, by discharge. As the form of the discharge, microwave discharge, alternating current discharge (pulse discharge or analog discharge, etc.), direct current discharge (spark discharge, arc discharge, glow discharge, corona discharge, etc.) can be assumed. It can be adopted as appropriate.

Figure 4 is a diagram illustrating an air purification system in the embodiment of the present invention. In addition to the air purification system 100 of the above reference example, the space 221 of the lower subbase 220 before Symbol tunnel 200, it is installed an auxiliary dust collector 400 similar to the dust collector. In this case, the auxiliary dust collector 400 takes in the air in the tunnel inner space 203 sucked from the dust collection port 250 provided on the side portion of the roadbed 220 through the first path 401. And like the said dust collector 102, it is made to pass through the filtration layer comprised, for example with the filter material. Thus the air of airborne particulate matter has been removed is supplied to the leading SL air purification system 100 via a second path 402.

Finally, the air purification system 100 in the above embodiment is actually operated, and the air purification performance and SPM and harmful substance removal performance obtained as a result are outlined. FIG. 5 is a diagram showing (a) purification performance data and (b) removal performance data in the present embodiment.
According to the air purification system 100 of this embodiment, as shown in the purification performance data of (a), 2 mg or less per cubic meter for SPM, 3 ppm or less for Nox (nitrogen oxide), SO ₂ (dioxide dioxide) Sulfur) was 0.4 ppm or less, aldehydes were 1 ppm or less, and oxidants were 0.6 ppm or less.
Further, as shown in the removal performance data of (b), 99% or more can be removed for SPM, and 90% or more can be removed for Nox (nitrogen oxide), SO ₂ (sulfur dioxide), aldehydes, and oxidants, respectively. did it.

According to the present invention, in order to reduce the number of ventilation shafts that have been required in the past or to eliminate the need for construction of ventilation shafts, for example, even tunnels that penetrate deeply in densely populated residential areas in the city center. In addition, man-hours and costs for constructing a long ventilation shaft and placing a wellhead are reduced, or it is not assumed from the beginning. Therefore, tunnel construction itself can be made easier than before, and the cost and construction period of this construction can be reduced as compared with the conventional construction.
Therefore, it is possible to provide an air purification system and an air purification system that achieves efficient and reliable air purification without using a ventilation shaft.

  Although the present embodiment has been described above, the above examples are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is explanatory drawing which shows the application form to the vertical tunnel of the air purification system in the reference example of this invention . It is a figure which shows the detail of the air purification system in this reference example . In this reference example , (a) A structural view at the A section, (b) A structural view at the B section, (c) A structural view at the C section, (d) A D section The structure figure in is shown. Is a diagram illustrating an air purification system in the embodiment of the present invention. It is a figure which shows (a) purification performance data and (b) removal performance data in this embodiment.

DESCRIPTION OF SYMBOLS 10 Residential densely populated 15 Underground 100 of densely populated residential area Air purification system 101 Air intake path 102 Dust collector 103 Hazardous substance removal device 104 Air return path 105 Air intake 106 Air outlet 107 Air suction fan 108 Nitrogen dioxide recovery body 200 Tunnel 201 Tunnel Wall 202 Perimeter of tunnel wall 203 Sky in tunnel 204 Side tunnel 300 Air flow

Claims (6)

An air purification system for purifying air in a tunnel,
The air in the tunnel that is installed in the space under the roadbed in the tunnel and sucked from the dust collection port provided in the roadbed is taken in via the first air intake path, and is suspended in the form of suspended particles. A first dust collector for removing material;
Pre SL air suspended particulate matter by the first dust collector has been removed, taken through the second air intake path, and a second dust collector to remove suspended particulate matter from the intake air, said second And a harmful substance removal device that removes harmful substances such as nitrogen compounds and carbon monoxide from the primary treated air treated by a dust collector, and installed in a side tunnel provided in the tunnel extension direction. Air purification equipment,
An air purification system comprising: an air return path for returning the purified air treated by the harmful substance removing device to the sky inside the tunnel.   2. The air purification device according to claim 1, wherein the second dust collector is a filtration type dust collector that passes air to be purified through a filtration layer constituted by a filter medium or the like and collects suspended particulate matter. system.   3. The air purification system according to claim 1, wherein the harmful substance removing device includes a denitration device that renders nitrogen oxides contained in the primary processing air harmless.   4. The air purification system according to claim 3, wherein the denitration apparatus includes a plasma generator capable of converting nitric oxide into nitrogen dioxide and a nitrogen dioxide recovery body.   5. The air purification system according to claim 1, wherein a plurality of the dust collection ports are provided so as to be arranged in an extending direction of the tunnel. A tunnel equipped with an air purification system for purifying air in the tunnel,
The air purification system includes:
The air in the tunnel that is installed in the space under the roadbed in the tunnel and sucked from the dust collection port provided on the side of the roadbed is taken in via the first air intake path, and the taken-in air A first dust collector that removes more suspended particulate matter;
The second dust collector that takes in the air from which the suspended particulate matter has been removed by the first dust collector through the second air intake path, and removes the suspended particulate matter from the introduced air, and the second dust collector. Air installed in a side tunnel provided in the extension direction of the tunnel, comprising a harmful substance removal device that removes harmful substances such as nitrogen compounds and carbon monoxide from primary treated air treated by a dust collector Purification equipment,
A tunnel having an air purification system, comprising: an air return path for returning the purified air treated by the harmful substance removing apparatus to the sky inside the tunnel.

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