CN101054903A - Ventilation and purification method for tunnel low air shaft - Google Patents
Ventilation and purification method for tunnel low air shaft Download PDFInfo
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- CN101054903A CN101054903A CN 200710040609 CN200710040609A CN101054903A CN 101054903 A CN101054903 A CN 101054903A CN 200710040609 CN200710040609 CN 200710040609 CN 200710040609 A CN200710040609 A CN 200710040609A CN 101054903 A CN101054903 A CN 101054903A
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- tunnel
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Abstract
The invention relates to tunnel kind, specifically relates to an exhaustion and purification method for the tunnel low air well which is especially suitable for condition that is difficult to arrange high air well with high requirements for environment and sight in the city tunnel construction. In this method, exhaust gas exhausting from the unnel air exit is first treated by purification to greatly reduce the harmful ingredient of the exhaust gas exhausting to the air well, thereby reducing the arranging height of the air well, the invention has advantages that under premise of meeting environmental protection requirement, the tunnel air exhaust well is reduced from the high air well above 25m to the low air well, which can reduce difficulty of city planning and air well expropriation and be in favor of construction of the city tunnel and environment protection of the city.
Description
Technical field
The present invention relates to tunnel-like, relate to a kind of ventilation and purification method for tunnel low air shaft that is particularly useful in the city tunnel construction environment, view are had relatively high expectations, high ventilating shaft is provided with difficult situation concretely.
Background technology
In highway (road) Tunnel Design, automobile gives off a large amount of pollution nuisances in the tunnel, the tunnel air draft can not directly be discharged in the external environment (especially city tunnel) by portals, and conventional method is to take contaminated air is concentrated, is discharged into external environment again after the ventilating shaft high-altitude dilution by certain altitude.But some for the environment in tunnel and on every side view have relatively high expectations, high ventilating shaft be provided with the difficulty the place, its toxic emission problem usually becomes the major obstacles that engineering construction is carried out smoothly.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of ventilation and purification method for tunnel low air shaft is provided, the waste gas elder generation process purified treatment that this method is discharged the air outlet in tunnel, the harmful components of the waste gas that drains into the ventilating shaft place are reduced significantly, thereby can reduce the height that is provided with of ventilating shaft.
The object of the invention realizes being finished by following technical scheme:
A kind of ventilation and purification method for tunnel low air shaft, comprise tunnel air outlet, ventilating shaft, be provided with blower fan between ventilating shaft and the air outlet, the waste gas that air outlet is discharged is delivered to ventilating shaft by blower fan and is discharged, it is characterized in that this method adopts following step: at first will send into cleaner, and remove the particle in institute's waste discharge gas through the waste gas that air outlet is discharged; Exhaust after will handling then is through NO
2Cleaning equipment is discharged by ventilating shaft at last.
Exhaust after cleaner is handled can be handled through oxidation furnaces earlier, and NO in the air is converted into NO
2, pass through NO afterwards again
2Cleaning equipment.
Described ventilating shaft is low ventilating shaft, and it highly is not more than 10 meters.
Described cleaner is a high-pressure static cleaner.
Advantage of the present invention is, satisfying under the environmental requirement prerequisite, and air draft well in tunnel is reduced to low ventilating shaft by high ventilating shaft more than the 25m, reduced the difficulty of urban planning and ventilating shaft expropriation of land, helps the construction and the urban environment protection of city tunnel.
Description of drawings
The specific embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-4, label 1-7 represents respectively: air outlet 1, high-pressure static cleaner 2, NO oxidation furnaces 3, NO
2 Cleaning equipment 4, blower fan 5, low ventilating shaft 6, tunnel cave 7.
Exhaust Air Cleaning implementer's case:
It is about more than 70% that air draft processing air quantity is about the interior total blast volume of tunnel cave, and when the portals zero-emission, air draft is handled air quantity and is at least ventilation in whole caves.Ventilator Room can be located at the by-pass of tunnel with layer in, also can be located in the special-purpose machine room of tunnel top, specifically decide on engineering specifications.At tunnel cave 7 tops or sidewall large-scale air outlet 1 is set, the about 4-6m/s of air port wind speed.
Embodiment one: adopted for two steps purified, and electrostatic precipitation+except that NO
2
See Fig. 1-2, blower fan 5 makes the waste gas through air outlet 1 at first pass through high-pressure static cleaner 2, removes the particle in institute's waste discharge gas; Pass through NO again
2 Cleaning equipment 4 is removed the NO in the exhaust
2By this two steps processing, enter NO in the exhaust of hanging down ventilating shaft 6
2, particle content reduces more than 90%, the height of low ventilating shaft 6 is below the 10m.
Embodiment two: adopted for three steps purified, and electrostatic precipitation+NO oxidation+except that NO
2
See accompanying drawing 3-4, blower fan 5 makes the waste gas through air outlet 1 at first pass through high-pressure static cleaner 2, removes the particle in institute's waste discharge gas; Pass through oxidation furnaces 3 again, NO in the air is converted into NO
2Pass through NO at last
2Cleaning equipment 4 is removed the NO in the exhaust
2Handle through three steps, enter in the exhaust of low ventilating shaft 6 not only NO
2Content reduces, and NO content also significantly reduces, and promptly NOx, particle content reduce more than 90% in the exhaust, and the height of low ventilating shaft 6 is below the 10m.
In the foregoing description:
The electrostatic precipitation section: face velocity is controlled at 9-13m/s, need leave certain space for maintenance before and after it.Electrostatic precipitation efficient is more than 80%, and wind speed is higher, efficient is lower.
NO oxidation humidifier section: sectional wind velocity is unsuitable too high, about 2-3m/s, and this section need leave enough spaces, are oxidized to NO for NO
2The about 5m of this segment length stays space for maintenance before and after it.Through after this section, the NO more than 80% is oxidized to NO2.
The NO2 clean-up stage: sectional wind velocity is about 2m/s, and gas by soup absorption, is removed airborne NO2 gas more than 90% through this section.
More than each functional section all have basic module to form according to machine room concrete condition flexible combination, need leave the above space for maintenance of 2m between each functional section.Waste gas is through after the processing of above each functional section, removes totally that NOx is efficient to be reached more than 80%, when only adopting when removing NO2 efficient reaching more than 90%.
Above-mentioned technology is that the breakthrough to conventional art also comprises the determining of tunnel air draft pollutant sensitive factor, contains CO, NOx, particle etc. in the tunnel pollutant.Traditional tunnel ventilation comprises existing relevant design standard, thinks that CO, particle concentration are up to standard in the dilution tunnel, and other pollutant loads are also up to standard.CO content is the controlling elements of control tunnel construction.Present technique discovers, to tunnel external environment, NOx (NO particularly
2) environment capacity control and concentration up to standard be only the sensitive factor of controlling air draft well height.
By the foregoing description, NO in the tunnel exhaust
2Suitable (the hourly average value 0.24mg/m of concentration in concentration and the environmental standard
3), cooperating again with certain distance around the control air draft well, traditional high air draft well can be reduced to low ventilating shaft.Extenuate tunnel ventilating shaft and the contradiction that needs city's planning greatly, promote the construction of city tunnel.
The foregoing description is an example with typical tunnel standard paragraphs, and PROCESS FOR TREATMENT and traditional handicraft contrast index see the following form
| Project | Unit | The tradition high altitude discharge | Embodiment one | Embodiment two |
| Original Nox total amount | kg/h | 4.9 | ||
| Original NO 2Concentration | mg/m 3 | 1.7 | ||
| Ventilating shaft discharging NOx total amount | kg/h | 4.9 | ?3.67 | ?1.47 |
| Ventilating shaft discharging NO 2Concentration | mg/m 3 | 1.7 | ?0.17 | ?0.29 |
| Air draft well height | m | ＞20m | ?＜10m | ?＜10m |
For standard 200m3/s air quantity, about 1.0 hundred million (RMB) of embodiment one investment of equipment, about 1.4 hundred million (RMB) of embodiment two investment of equipment.
The present invention adopts a series of peculiar technologies in the tunnel air draft, concentrate to purify, remove responsive pollutant, reduces tunnel air draft nuisance concentration and total amount, makes tradition adopt (height) ventilating shaft height in the dilution discharge of high-altitude to be reduced to low ventilating shaft.
Those skilled in the art can recognize that obviously present embodiment is in specific implementation process, for high-pressure static cleaner 2, NO oxidation furnaces 3, NO
2The concrete selection of cleaning equipment 4 can be carried out various match selection according to the actual conditions of engineering, and for example device type, device parameter or the like are not given unnecessary details one by one at this.
Claims (4)
1, a kind of ventilation and purification method for tunnel low air shaft, comprise tunnel air outlet, ventilating shaft, be provided with blower fan between ventilating shaft and the air outlet, the waste gas that air outlet is discharged is delivered to ventilating shaft by blower fan and is discharged, it is characterized in that this method adopts following step: at first will send into cleaner, and remove the particle in institute's waste discharge gas through the waste gas that air outlet is discharged; Exhaust after will handling then is through NO
2Cleaning equipment is discharged by ventilating shaft at last.
2, a kind of ventilation and purification method for tunnel low air shaft according to claim 1 is characterized in that the exhaust after cleaner is handled is handled through oxidation furnaces earlier, and NO in the air is converted into NO
2, pass through NO afterwards again
2Cleaning equipment.
3, a kind of ventilation and purification method for tunnel low air shaft according to claim 1 is characterized in that described ventilating shaft is low ventilating shaft, and it highly is not more than 10 meters.
4, a kind of ventilation and purification method for tunnel low air shaft according to claim 1 and 2 is characterized in that described cleaner is a high-pressure static cleaner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710040609 CN101054903A (en) | 2007-05-14 | 2007-05-14 | Ventilation and purification method for tunnel low air shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710040609 CN101054903A (en) | 2007-05-14 | 2007-05-14 | Ventilation and purification method for tunnel low air shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101054903A true CN101054903A (en) | 2007-10-17 |
Family
ID=38794927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710040609 Pending CN101054903A (en) | 2007-05-14 | 2007-05-14 | Ventilation and purification method for tunnel low air shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101054903A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828765A (en) * | 2012-07-19 | 2012-12-19 | 中铁第四勘察设计院集团有限公司 | Urban tunnel pollution discharge structure with fan room and a plurality of low booths |
-
2007
- 2007-05-14 CN CN 200710040609 patent/CN101054903A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828765A (en) * | 2012-07-19 | 2012-12-19 | 中铁第四勘察设计院集团有限公司 | Urban tunnel pollution discharge structure with fan room and a plurality of low booths |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C12 | Rejection of a patent application after its publication | ||
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Open date: 20071017 |