JP3173625B2 - Dust collector for motorway tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector for purifying air in a motorway tunnel using an electric dust collector.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show a conventional dust collector for a motorway tunnel. First, FIG. 10 shows a dust collecting chamber 2 in which a bypass pavement having both ends opened is provided on a side wall of a motorway tunnel 1, and an electric dust collector 3 and a blower 4 are installed in the dust collecting chamber 2. (Bypass type).
The contaminated air in the roadway space 1a taken in from the air suction port 5 at one end of the dust collecting chamber 2 by the blower 4 passes through the electric dust collector 3 and is purified. The air is returned to the roadway space 1a again from the air outlet 6 at the end via the corner duct 7. The dust collecting chamber 2 has a rear half vertically divided by a partition plate 8, a blower 4 is installed in an upper space 2a, and a lower space 2b is a space for installing a washing water treatment facility of an electric dust collector 3 and an electric component. It is used for truck entrances for loading and unloading equipment.

On the other hand, FIG. 11 shows a structure in which an upper portion of a roadway space 1a is partitioned by a partition plate 9 to form a dust collecting chamber 2, and an electric dust collector 3 and a blower 4 are installed in the dust collecting chamber 2. (Ceiling installation type). The contaminated air taken in from the air suction port 5 at one end of the dust collecting chamber 2 along the longitudinal direction of the motorway tunnel 1 is purified by the electric dust collector 3 and is sent from the blower 4 at the other end as shown by an arrow ⇒. It is returned to the roadway space 1a as it is.

[0004]

As described above, in a conventional dust collector for a motorway tunnel, a blower is installed in a dust collecting room to guide contaminated air to an electric dust collector. However, this blower consumes large power and
There was a problem that the noise was loud. SUMMARY OF THE INVENTION It is an object of the present invention to provide an automobile road tunnel dust collecting apparatus which can guide air in a tunnel to a dust collecting chamber without relying on a blower.

[0005]

Means for Solving the Problems] This invention has been made to attempt to capture contaminated air roadway space by utilizing the pressure difference caused in the tunnel dust collection chamber, the one-way ventilation wind
By closes the upper part of the roadway space motorway tunnel ceiling plate to reduce the tunnel cross-section locally flowing, than the back and forth along a portion of motorway tunnel ventilating direction of the ventilating air those causing low pressure portion, the air delivery port of the dust collecting chamber causes opening the road space of this part, which opens the air suction port of the dust collecting chamber on the upstream side of the ceiling plate of the roadway space And

[0006]

[Function] On the other hand, in a motorway tunnel for traffic, the piston effect caused by the running of a car, the ventilation power by ventilating equipment such as a jet fan installed on the ceiling and the blower and exhaust fan installed in the shaft, and the natural ventilation power The ventilation wind is always flowing in one direction. Therefore, if a section having a high wind speed is formed in a part of the tunnel by locally reducing the cross section of the tunnel, the pressure in that part becomes lower than before and after that, and a pressure difference is generated there. Therefore, by opening the air discharge port of the dust collection chamber in the low pressure part and opening the air suction port on the upstream side of the ceiling plate, the contaminated air in the roadway space is sucked into the dust collection chamber by the so-called spraying principle. be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same reference numerals are used for the portions corresponding to the conventional example. Embodiment 1 FIGS. 1 to 3 show an embodiment of a bypass type dust collecting apparatus, FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along the line II-II, and FIG. FIG. 4 is a diagram qualitatively showing a longitudinal pressure distribution in the inside. In FIGS. 1 and 2, it is assumed that the ventilation flow is flowing in the arrow → direction in the roadway space 1a of the roadway tunnel 1 for the reason already described. This roadway space 1a has a locally
And the tunnel cross section is reduced at that point. As shown in FIG. 2, the ceiling plate 10 starts at a point apart from the center of the air suction port 5 of the dust collection chamber 2 by a representative length D (= 4 × tunnel sectional area / tunnel sectional circumference), and has a total length of 2
D to 5D. The front and rear ends of the ceiling plate 10 are provided with an inclination.

The air outlet 6 of the dust collecting chamber 2 is provided so as to open in the middle of the reduced section of the tunnel 1, and the air suction port 5 is provided so as to open upstream of the ceiling plate 10. ing. Here, at the air delivery end of the dust collection chamber 2, the right half of the partition plate 8 in the drawing is partially cut away, and an L-shaped partition wall 11 that closes the lower space 2b is provided along the cut edge. And the upper and lower spaces 2a, 2b
Is formed as an integrated ventilation path. This ventilation passage leads to an air outlet 6 opened in the side wall of the tunnel 1 below the ceiling plate 10, and the left half of the lower space 2b adjacent to the ventilation passage continues to the back as a truck entrance as in the past. . An opening / closing door 12 (FIG. 2) is provided at the entrance of the truck approach path.

As shown in the drawing, when a section having a reduced cross section is provided in a part of the motorway tunnel 1, the wind speed becomes higher at that part and the pressure is reduced. FIG. 3 shows the state confirmed by actual measurement, where p ₀ is a stationary part in the roadway space 1a.
At the entrance of the cross-sectional reduction portion, rapidly decreases, then returns slightly, becomes p ₁ lower than p ₀ , maintains the same state, and gradually recovers to p ₀ at the exit of the cross-sectional reduction portion. For example, the standard cross section of a motorway tunnel in Japan is 55.8
m ² , the total height is 6.7m, but the construction limit at that time 4.7
When the ceiling panel 10 is attached at a height of m, the reduced sectional area is
44.5m ² . Therefore, the standard wind speed in the tunnel is V ₁
= 7 m / s, the wind speed at the reduced section is V ₂ = 8.8 m / s from the continuous equation, and the static pressure (p ₀ −
p ₁₎ is maximum 1.7mmAq from ^{_{ρ (V 2 2 -V 1 2}} ) / 2 (ρ is air density). Incidentally, an electric dust collector generally obtains a dust collection efficiency of about 80% at a static pressure of 12 mmAq, but obtains a dust collection efficiency of about 30% at a static pressure of 1.7 mmAq.

[0010] Now, in the above-described structure, the pressure of the air suction port 5 of the dust collecting chamber 2 is higher than the air outlet 6, there is a pressure differential p ₀ -p ₁ therebetween. As a result, the contaminated air in the vicinity of the air suction port 5 is taken into the dust collection chamber 2 by the pressure difference, passes through the electric precipitator 3 and returns from the air outlet 6 to the roadway space 1a. Occurs naturally. Therefore, according to such a configuration, the dust collection chamber 2
It is possible to reduce the capacity even if the fan inside the unit is omitted or not at all, reducing power consumption by that much,
In addition, noise can be reduced. However, in the case of the natural suction described above, a static pressure as high as that of a blower cannot be obtained, and a reduction in dust collection efficiency cannot be denied. However, when attempting to install a dust collecting device in an existing motorway tunnel, it may not be possible to install a blower with large power consumption due to restrictions on the capacity of the power distribution equipment, and in such a case, applying the present invention Very useful.

Embodiment 2 FIG. 4 is a perspective view showing a different embodiment of the bypass type dust collector, and FIG. 5 is a sectional view taken along the line V--V. In this embodiment, the configuration of the dust collection chamber 2 is the same as that of the conventional apparatus, but a duct 14 is formed by a ceiling plate 10 and a partition plate 13 at a position corresponding to the conventional corner duct 7, and the ceiling 14 is formed at that portion. A ventilation hole 15 is opened in the plate 10.
Also in this case, the tunnel section is reduced by the ceiling plate 10,
The contaminated air in the roadway space 1a flows from the air suction port 5 to the dust collection chamber 2
The air enters the duct 14 from the air outlet 6 as shown by the arrow ⇒, and is returned to the roadway space 1a through the vent 15.

Embodiment 3 FIG. 6 is a perspective view showing still another embodiment of a bypass type dust collector, and FIG. 7 is a sectional view taken along the line VII-VII. In this embodiment, a ceiling plate 10 is provided so as to be in close contact with the upstream side of a corner duct 7 of the conventional apparatus, and a tunnel cross-sectional reduction portion having a total length of 2D to 5D is formed as a whole. In this case, the air outlet of the corner duct 7 hits the outlet of reduced cross section, the pressure of this portion is way to recovery from the low pressure p ₁ to the constant pressure p ₀ (see FIG. 3). Therefore,
Although the pressure difference obtained is smaller than in Examples 1 and 2 in which the air outlet is opened in the middle of the reduced cross section, there is an advantage that the construction is simple.

Embodiment 4 Finally, FIGS. 8 and 9 show an embodiment of the present invention in a ceiling-mounted dust collecting apparatus. FIG. 8 is a longitudinal sectional view, and FIG. 9 shows a longitudinal pressure distribution in a tunnel. FIG. In FIG. 8, a ceiling plate 10 for reducing the tunnel cross section is provided downstream of a partition plate 9 forming the dust collecting chamber 2 with an air outlet 6 therebetween. The front end of the ceiling plate 10 is formed in an arc shape, and the rear end is provided with an inclination. In this case, the dust collection chamber 2 closed front and rear by the electric precipitator 3 also forms a reduced section, and according to actual measurement, the pressure distribution is shown in FIG.
It is shown as follows. As a result, as in the case of the bypass type embodiment, a pressure difference of p ₀ -p ₁ is generated between the air suction port 5 and the air discharge port 6 of the dust collection chamber 2, thereby passing through the dust collection chamber 2. The natural flow shown by the arrow ⇒ is obtained.

[0014]

According to the present invention, a reduced cross section is formed in a part of a motorway tunnel, thereby generating a pressure difference between an air suction port and an air outlet of a dust collection chamber to collect dust. By adopting a configuration in which the contaminated air in the roadway space is taken into the room, the power consumption and noise can be significantly reduced by eliminating the blower from the dust collection device or reducing the capacity thereof. In addition, since the dust collecting device can be constituted only by an electric dust collector with low power consumption, it is possible to install the dust collecting device in an existing motorway tunnel having a limited power distribution capacity.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in a bypass dust collector.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a diagram showing a pressure distribution in a tunnel in FIG. 1;

FIG. 4 is a perspective view showing another embodiment of the present invention in a bypass type dust collecting apparatus.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a perspective view showing still another embodiment of the present invention in a bypass type dust collecting apparatus.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a perspective view showing an embodiment of the present invention in a ceiling-mounted dust collecting apparatus.

FIG. 9 is a diagram showing a pressure distribution in a tunnel in FIG. 8;

FIG. 10 is a perspective view showing a conventional example.

FIG. 11 is a perspective view showing a different conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile tunnel 1a Roadway space 2 Dust collection room 3 Electric dust collector 5 Air suction port 6 Air outlet 10 Ceiling panel

Claims (1)

(57) [Claims] An electric precipitator is installed in a dust collection chamber having both ends communicating with a roadway space of a motorway tunnel, and contaminated air in the roadway space taken from an air suction port at one end of the dust collection chamber is discharged to the electric dust collector. In a dust collector for a motorway tunnel, which is cleaned by a dust collector and returned to the roadway space again from an air outlet at the other end, a part of the motorway tunnel through which ventilation wind flows in one direction.
By locally reducing the tunnel section closes the upper portion of the roadway space ceiling plate, resulting a portion to the low pressure portion than its back and forth along the ventilating direction of ventilating air of the motorway tunnels is, causes opening the air delivery port of the precipitator chamber to said roadway space of this part, the vehicles
The ceiling board said precipitator chamber motorway tunnels for precipitator apparatus characterized by an air suction port was opened in the upstream side of the road space.