WO2012011393A1 - Facility for treatment of gas in tunnel - Google Patents
Facility for treatment of gas in tunnel Download PDFInfo
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- WO2012011393A1 WO2012011393A1 PCT/JP2011/065534 JP2011065534W WO2012011393A1 WO 2012011393 A1 WO2012011393 A1 WO 2012011393A1 JP 2011065534 W JP2011065534 W JP 2011065534W WO 2012011393 A1 WO2012011393 A1 WO 2012011393A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/09—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
- B03C3/155—Filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/25—Coated, impregnated or composite adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to a gas processing facility in a tunnel for processing a gas in a tunnel through which an automobile or the like passes.
- a tunnel gas treatment facility is provided to ventilate while processing the gas in the tunnel outside the tunnel.
- a gas processing facility in the tunnel for example, as described in Patent Document 1 below, the suspended particulate matter (SPM) is removed from the gas in the tunnel with an electric dust collector. From the above, after absorbing and removing nitrogen dioxide with a nitrogen dioxide absorbent, various post-treatments and exhausting them out of the tunnel are known.
- the nitrogen dioxide absorbent absorbs and removes nitrogen dioxide, so as the gas in the tunnel is treated, the nitrogen dioxide absorbent absorbs nitrogen dioxide. Is gradually reduced, so that the nitrogen dioxide absorbent is replaced every operation for a predetermined time.
- an object of the present invention is to provide a tunnel gas treatment facility capable of extending the life of the nitrogen dioxide absorbent as compared with the conventional one.
- a gas processing facility in a tunnel is provided in a duct that communicates the inside and outside of the tunnel and distributes the gas in the tunnel to the outside, and the duct.
- An electrostatic precipitator, a nitrogen dioxide absorbent disposed downstream of the electric precipitator in the duct in the flow direction of the gas, the electrostatic precipitator in the duct and the nitrogen dioxide absorption
- a fine filter having air permeability that is disposed between the agent and capable of collecting only particles having a particle diameter of less than 20 ⁇ m, and is disposed between the fine filter in the duct and the electric dust collector.
- a coarse filter having air permeability capable of collecting particles having a particle diameter of 20 ⁇ m or more is provided.
- the tunnel gas processing facility according to the present invention is characterized in that, in the above-described tunnel gas processing facility, the fine filter can collect only particles having a particle diameter of 10 ⁇ m or more.
- particles such as oil mist that have passed without being removed by the electric dust collector can be removed by the filter, so that the applied voltage of the electric dust collector is increased. Therefore, it is possible to remarkably suppress the surface of the nitrogen dioxide absorbent from being coated with the particles, and it is possible to extend the life of the nitrogen dioxide absorbent as compared with the prior art.
- an electrostatic precipitator 12 that removes suspended particulate matter (SPM) in the gas 1 is disposed in a duct 11 that connects the inside and outside of a tunnel through which an automobile or the like passes.
- a nitrogen dioxide absorbent 13 that absorbs and removes nitrogen dioxide in the gas 1 is disposed downstream of the electric dust collector 12 in the duct 11 in the flow direction of the gas 1.
- This nitrogen dioxide absorbent 13 is a honeycomb carrier made of activated carbon or the like as a main raw material, impregnated with an alkali such as potassium hydroxide in an aqueous solution and dried, and nitrogen dioxide is hydroxylated. Absorption is removed by reacting with an alkali such as potassium to make potassium nitrate or the like.
- a fine filter 15 is provided between the fine filter 15 in the duct 11 and the electrostatic precipitator 12, a coarse filter 14 made of an air-permeable nonwoven fabric capable of collecting particles having a particle diameter of 20 ⁇ m or more is disposed.
- the electrostatic precipitator 12 removes the SPM in the gas 1.
- a part (about 20%) of particles such as oil mist (particle size: about 20 ⁇ m) in the gas 1 passes through the electric dust collector 12 without being removed, the coarse filter 14 and the fine filter 15.
- the nitrogen dioxide is absorbed and removed by the nitrogen dioxide absorbent 13
- the gas 1 is exhausted out of the tunnel after various post treatments.
- the above-mentioned particles that have passed without being removed by the electrostatic precipitator 12 are collected by the filters 14 and 15.
- the surface of the nitrogen dioxide absorbent 13 is remarkably suppressed from being covered with the particles without increasing the applied voltage of the electrostatic precipitator 12. Can do.
- the life of the nitrogen dioxide absorbent 13 can be extended as compared with the conventional case.
- the particles such as oil mist (particle size: about 20 ⁇ m) passed without being removed by the electrostatic precipitator 12 are collected by the coarse filter 14 and then collected by the fine filter 15.
- the fine filter 15 can be greatly prevented from being clogged at an early stage, and the periodic inspection interval and replacement of the filters 14 and 15 can be performed together with the extension of the replacement life of the nitrogen dioxide absorbent 13. Life can be extended.
- the thicknesses of the filters 14 and 15 are appropriately determined in consideration of the pressure loss and the like with respect to the gas 1, but are preferably 50 mm or less.
- the coarse filter 14 has a thickness of 40 mm or less. More preferably, the fine filter 15 has a thickness of 20 mm or less.
- each of the filters 14 and 15 located on the most upstream side in the flow direction of the gas 1 is moved to the most downstream side in the flow direction and located on the most upstream side.
- the filters 14 and 15 respectively disposed adjacent to the filters 14 and 15 are moved so as to be positioned on the most upstream side, and hereinafter, the filters 14 and 15 are upstream of the gas 1 in the flow direction.
- the filters 14 and 15 can be used without waste if they are arranged so as to be sequentially moved to the side.
- the number of the filters 14 and 15 is appropriately selected in consideration of the pressure loss with respect to the gas 1 and the thickness thereof.
- FIG. 2 shows test results (examples) conducted to confirm the effects of the gas treatment facility in the tunnel according to the present invention.
- FIG. 2 also shows a test result (comparative example) in the case where there is no conventional tunnel gas treatment facility, that is, a coarse filter and a fine filter.
- the test conditions are as follows.
- the nitrogen dioxide removal rate by the nitrogen dioxide removing agent begins to gradually decrease from around 1000 hours, sharply decreases from around 2000 hours, and at 3000 hours. It became 90% or less.
- the nitrogen dioxide removal rate by the nitrogen dioxide removing agent starts to gradually decrease from around 2000 hours, but the performance of 90% or more can be maintained even after 5000 hours. It could be confirmed.
- the in-tunnel gas treatment facility according to the present invention can extend the life of the nitrogen dioxide absorbent as compared with the conventional one, it can be used in an extremely useful manner industrially.
Abstract
A facility for treating a gas in a tunnel, comprising a duct (11) which enables the communication between the inside and the outside of the tunnel and can allow a gas (1) in the tunnel to flow to the outside, an electrical dust precipitator (12) which is arranged in the duct (11), a nitrogen dioxide absorbent (13) which is placed in the duct (11) on the side of downstream of the flow of the gas (1) relative to the electrical dust precipitator (12), an air-permeable fine filter (15) which is arranged between the electrical dust precipitator (12) and the nitrogen dioxide absorbent (13) in the duct (11) and can trap only particles having particle diameters of less than 20 μm, and an air-permeable coarse filter (14) which is arranged between the fine filter (15) and the electrical dust precipitator (12) in the duct (11) and can trap particles having particle diameters of 20 μm or more.
Description
本発明は、自動車等が通過するトンネル内のガスを処理するトンネル内ガス処理設備に関する。
The present invention relates to a gas processing facility in a tunnel for processing a gas in a tunnel through which an automobile or the like passes.
自動車等が通過するトンネル内には、自動車等からの排ガスが滞留しやすいため、トンネル内のガスをトンネル外へ処理しながら換気するトンネル内ガス処理設備が設けられている。このようなトンネル内ガス処理設備としては、例えば、下記特許文献１等に記載されているように、トンネル内のガスに対して、電気集塵器で浮遊粒子状物質（ＳＰＭ）を除去してから、二酸化窒素吸収剤で二酸化窒素を吸収除去した後、各種後処理をしてトンネル外へ排気するものが知られている。
In the tunnel through which automobiles and the like pass, exhaust gas from automobiles and the like tends to stay, so a tunnel gas treatment facility is provided to ventilate while processing the gas in the tunnel outside the tunnel. As such a gas processing facility in the tunnel, for example, as described in Patent Document 1 below, the suspended particulate matter (SPM) is removed from the gas in the tunnel with an electric dust collector. From the above, after absorbing and removing nitrogen dioxide with a nitrogen dioxide absorbent, various post-treatments and exhausting them out of the tunnel are known.
このような従来のトンネル内ガス処理設備においては、二酸化窒素吸収剤が二酸化窒素を吸収して除去することから、トンネル内のガスを処理していくにしたがって、二酸化窒素吸収剤の二酸化窒素吸収能力が徐々に低下するため、所定時間運転ごとに二酸化窒素吸収剤を交換するようにしている。
In such a conventional gas treatment facility in a tunnel, the nitrogen dioxide absorbent absorbs and removes nitrogen dioxide, so as the gas in the tunnel is treated, the nitrogen dioxide absorbent absorbs nitrogen dioxide. Is gradually reduced, so that the nitrogen dioxide absorbent is replaced every operation for a predetermined time.
ところが、前述したような従来のトンネル内ガス処理設備においては、上記二酸化窒素吸収剤の実際の二酸化窒素吸収能力が、理論上の二酸化窒素吸収能力よりもかなり低くなって、上記二酸化窒素吸収剤の寿命が短くなってしまっていた。
However, in the conventional tunnel gas treatment equipment as described above, the actual nitrogen dioxide absorption capacity of the nitrogen dioxide absorbent is considerably lower than the theoretical nitrogen dioxide absorption capacity. The life has been shortened.
このため、本発明者らが鋭意研究したところ、ガス中のオイルミスト（粒径：約２０μｍ程度）等の粒子が電気集塵器ですべて除去されず（除去率：約８０％）、当該電気集塵器を通過した当該粒子が二酸化窒素吸収剤の表面を次第に被覆して、二酸化窒素吸収剤の二酸化窒素吸収能力を徐々に阻害していることが判明した。
For this reason, when the present inventors diligently studied, particles such as oil mist (particle diameter: about 20 μm) in the gas are not completely removed by the electric dust collector (removal rate: about 80%), and the electric It turned out that the said particle | grains which passed the dust collector gradually coat | covered the surface of the nitrogen dioxide absorbent, and have gradually inhibited the nitrogen dioxide absorption ability of the nitrogen dioxide absorbent.
そこで、前記電気集塵器の集塵能力を高めるように当該電気集塵器の印加電圧を大きくして、上記粒子の除去率を高めることが考えられるが、電気集塵器の印加電圧を大きくしてしまうと、オゾンが多く発生して、ガス中の一酸化窒素を酸化させて二酸化窒素にしてしまい、上記二酸化窒素吸収剤で吸収除去する二酸化窒素量が増加して、結局、二酸化窒素吸収剤の寿命が従来と大きく変わらなくなってしまう。
Therefore, it is conceivable to increase the applied voltage of the electrostatic precipitator so as to increase the dust collection capacity of the electrostatic precipitator to increase the removal rate of the particles, but the applied voltage of the electrostatic precipitator is increased. As a result, a lot of ozone is generated, and nitrogen monoxide in the gas is oxidized into nitrogen dioxide, and the amount of nitrogen dioxide absorbed and removed by the nitrogen dioxide absorbent increases, eventually absorbing nitrogen dioxide. The life of the agent will not be significantly different from the conventional one.
このようなことから、本発明は、従来よりも二酸化窒素吸収剤の長寿命化を図ることができるトンネル内ガス処理設備を提供することを目的とする。
Therefore, an object of the present invention is to provide a tunnel gas treatment facility capable of extending the life of the nitrogen dioxide absorbent as compared with the conventional one.
前述した課題を解決するための、本発明に係るトンネル内ガス処理設備は、トンネルの内部と外部とを連絡して当該トンネル内のガスを外部へ流通させるダクトと、前記ダクト内に配設された電気集塵器と、前記ダクト内の前記電気集塵器よりも前記ガスの流通方向下流側に配設された二酸化窒素吸収剤と、前記ダクト内の前記電気集塵器と前記二酸化窒素吸収剤との間に配設されて粒径２０μｍ未満の粒子のみを捕集可能な通気性を有する細目フィルタと、前記ダクト内の前記細目フィルタと前記電気集塵器との間に配設されて粒径２０μｍ以上の粒子を捕集可能な通気性を有する粗目フィルタと備えていることを特徴とする。
In order to solve the above-mentioned problems, a gas processing facility in a tunnel according to the present invention is provided in a duct that communicates the inside and outside of the tunnel and distributes the gas in the tunnel to the outside, and the duct. An electrostatic precipitator, a nitrogen dioxide absorbent disposed downstream of the electric precipitator in the duct in the flow direction of the gas, the electrostatic precipitator in the duct and the nitrogen dioxide absorption A fine filter having air permeability that is disposed between the agent and capable of collecting only particles having a particle diameter of less than 20 μm, and is disposed between the fine filter in the duct and the electric dust collector. A coarse filter having air permeability capable of collecting particles having a particle diameter of 20 μm or more is provided.
また、本発明に係るトンネル内ガス処理設備は、上述したトンネル内ガス処理設備において、前記細目フィルタが、粒径１０μｍ以上の粒子のみを捕集可能なものであることを特徴とする。
The tunnel gas processing facility according to the present invention is characterized in that, in the above-described tunnel gas processing facility, the fine filter can collect only particles having a particle diameter of 10 μm or more.
本発明に係るトンネル内ガス処理設備によれば、電気集塵器で除去されずに通過したオイルミスト等の粒子を前記フィルタで除去することができるので、電気集塵器の印加電圧を大きくすることなく、二酸化窒素吸収剤の表面が上記粒子で被覆されてしまうことを著しく抑制することができ、従来よりも二酸化窒素吸収剤の長寿命化を図ることができる。
According to the gas processing facility in a tunnel according to the present invention, particles such as oil mist that have passed without being removed by the electric dust collector can be removed by the filter, so that the applied voltage of the electric dust collector is increased. Therefore, it is possible to remarkably suppress the surface of the nitrogen dioxide absorbent from being coated with the particles, and it is possible to extend the life of the nitrogen dioxide absorbent as compared with the prior art.
本発明に係るトンネル内ガス処理設備の実施形態を図面に基づいて以下に説明するが、本発明は図面に基づいて説明する以下の実施形態のみに限定されるものではない。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a tunnel gas treatment facility according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments described with reference to the drawings.
〈主な実施形態〉
本発明に係るトンネル内ガス処理設備の主な実施形態を図１に基づいて説明する。 <Main embodiment>
A main embodiment of a gas processing facility in a tunnel according to the present invention will be described with reference to FIG.
本発明に係るトンネル内ガス処理設備の主な実施形態を図１に基づいて説明する。 <Main embodiment>
A main embodiment of a gas processing facility in a tunnel according to the present invention will be described with reference to FIG.
図１に示すように、自動車等が通過するトンネルの内部と外部とを連絡するダクト１１内には、ガス１中の浮遊粒子状物質（ＳＰＭ）を除去する電気集塵器１２が配設されている。このダクト１１内の前記電気集塵器１２よりもガス１の流通方向下流側には、ガス１中の二酸化窒素を吸収除去する二酸化窒素吸収剤１３が配設されている。この二酸化窒素吸収剤１３は、活性炭等を主原料としたハニカム形の担体に、水酸化カリウム等のアルカリを水溶液にして含浸させて乾燥することにより担持させたものであり、二酸化窒素を水酸化カリウム等のアルカリに反応させて硝酸カリウム等にすることにより、吸収除去するようにしたものである。
As shown in FIG. 1, an electrostatic precipitator 12 that removes suspended particulate matter (SPM) in the gas 1 is disposed in a duct 11 that connects the inside and outside of a tunnel through which an automobile or the like passes. ing. A nitrogen dioxide absorbent 13 that absorbs and removes nitrogen dioxide in the gas 1 is disposed downstream of the electric dust collector 12 in the duct 11 in the flow direction of the gas 1. This nitrogen dioxide absorbent 13 is a honeycomb carrier made of activated carbon or the like as a main raw material, impregnated with an alkali such as potassium hydroxide in an aqueous solution and dried, and nitrogen dioxide is hydroxylated. Absorption is removed by reacting with an alkali such as potassium to make potassium nitrate or the like.
前記ダクト１１内の前記電気集塵器１２と前記二酸化窒素吸収剤１３との間には、粒径２０μｍ未満（好ましくはさらに粒径１０μｍ以上）の粒子のみを捕集可能な通気性を有する不織布からなる細目フィルタ１５が配設されている。上記ダクト１１内の上記細目フィルタ１５と上記電気集塵器１２との間には、粒径２０μｍ以上の粒子を捕集可能な通気性を有する不織布からなる粗目フィルタ１４が配設されている。
Between the electric dust collector 12 and the nitrogen dioxide absorbent 13 in the duct 11, a non-woven fabric having air permeability capable of collecting only particles having a particle size of less than 20 μm (preferably further a particle size of 10 μm or more). A fine filter 15 is provided. Between the fine filter 15 in the duct 11 and the electrostatic precipitator 12, a coarse filter 14 made of an air-permeable nonwoven fabric capable of collecting particles having a particle diameter of 20 μm or more is disposed.
このような本実施形態に係るトンネル内ガス処理設備において、トンネル内のガス１が前記ダクト１１内を流通すると、前記電気集塵器１２が当該ガス１中のＳＰＭを除去する。このとき、上記ガス１中のオイルミスト（粒径：約２０μｍ程度）等の粒子の一部（約２０％）が除去されずに当該電気集塵器１２を通過してしまうものの、前記粗目フィルタ１４及び前記細目フィルタ１５で捕集される。そして、上記ガス１は、前記二酸化窒素吸収剤１３で二酸化窒素が吸収除去された後、各種後処理をされてからトンネル外へ排気される。
In such a tunnel gas processing facility according to this embodiment, when the gas 1 in the tunnel flows through the duct 11, the electrostatic precipitator 12 removes the SPM in the gas 1. At this time, although a part (about 20%) of particles such as oil mist (particle size: about 20 μm) in the gas 1 passes through the electric dust collector 12 without being removed, the coarse filter 14 and the fine filter 15. Then, after the nitrogen dioxide is absorbed and removed by the nitrogen dioxide absorbent 13, the gas 1 is exhausted out of the tunnel after various post treatments.
つまり、本実施形態に係るトンネル内ガス処理設備においては、電気集塵器１２で除去されずに通過した上記粒子を前記フィルタ１４，１５で捕集するようにしたのである。
That is, in the in-tunnel gas processing facility according to the present embodiment, the above-mentioned particles that have passed without being removed by the electrostatic precipitator 12 are collected by the filters 14 and 15.
このため、本実施形態に係るトンネル内ガス処理設備では、電気集塵器１２の印加電圧を大きくすることなく、二酸化窒素吸収剤１３の表面が上記粒子で被覆されてしまうことを著しく抑制することができる。
For this reason, in the in-tunnel gas treatment facility according to the present embodiment, the surface of the nitrogen dioxide absorbent 13 is remarkably suppressed from being covered with the particles without increasing the applied voltage of the electrostatic precipitator 12. Can do.
したがって、本実施形態に係るトンネル内ガス処理設備によれば、従来よりも二酸化窒素吸収剤１３の長寿命化を図ることができる。
Therefore, according to the in-tunnel gas treatment facility according to the present embodiment, the life of the nitrogen dioxide absorbent 13 can be extended as compared with the conventional case.
また、前記電気集塵器１２で除去されずに通過したオイルミスト（粒径：約２０μｍ程度）等の上記粒子を前記粗目フィルタ１４で捕集してから前記細目フィルタ１５で捕集するようにしたので、当該細目フィルタ１５が早期に目詰まりしてしまうことを大きく抑制することができ、上記二酸化窒素吸収剤１３の交換寿命の延長化と併せて当該フィルタ１４，１５の定期点検間隔や交換寿命を延長することができる。
In addition, the particles such as oil mist (particle size: about 20 μm) passed without being removed by the electrostatic precipitator 12 are collected by the coarse filter 14 and then collected by the fine filter 15. As a result, the fine filter 15 can be greatly prevented from being clogged at an early stage, and the periodic inspection interval and replacement of the filters 14 and 15 can be performed together with the extension of the replacement life of the nitrogen dioxide absorbent 13. Life can be extended.
なお、前記フィルタ１４，１５の厚さは、前記ガス１に対する圧力損失等を考慮して適宜決定される値であるが、５０ｍｍ以下であると好ましく、特に、粗目フィルタ１４は厚さが４０ｍｍ以下であるとさらに好ましく、細目フィルタ１５は厚さが２０ｍｍ以下であるとさらに好ましい。
The thicknesses of the filters 14 and 15 are appropriately determined in consideration of the pressure loss and the like with respect to the gas 1, but are preferably 50 mm or less. In particular, the coarse filter 14 has a thickness of 40 mm or less. More preferably, the fine filter 15 has a thickness of 20 mm or less.
また、本実施形態においては、前記フィルタ１４，１５をそれぞれ一枚ずつ設けた場合について説明したが、他の実施形態として、例えば、前記フィルタ１４，１５を前記ガス１の流通方向に沿ってそれぞれ複数枚ずつ設けることも可能である。この場合、例えば、保守点検管理のときに、前記ガス１の流通方向最上流側にそれぞれ位置する各上記フィルタ１４，１５を流通方向最下流側にそれぞれ移設し、最上流側に位置していた各上記フィルタ１４，１５に隣り合うようにそれぞれ配設されていた前記フィルタ１４，１５を最上流側に位置させるようにそれぞれ移設し、以下、前記フィルタ１４，１５を前記ガス１の流通方向上流側に順次移設するようにローテーション配設すれば、上記フィルタ１４，１５を無駄なく利用することができる。なお、上記フィルタ１４，１５の枚数は、前記ガス１に対する圧力損失等を考慮してその厚さと併せて適宜選定する。
Moreover, in this embodiment, although the case where the said filters 14 and 15 were each provided was demonstrated, as another embodiment, for example, the said filters 14 and 15 are each along the distribution direction of the said gas 1. It is also possible to provide a plurality of sheets. In this case, for example, at the time of maintenance / inspection management, each of the filters 14 and 15 located on the most upstream side in the flow direction of the gas 1 is moved to the most downstream side in the flow direction and located on the most upstream side. The filters 14 and 15 respectively disposed adjacent to the filters 14 and 15 are moved so as to be positioned on the most upstream side, and hereinafter, the filters 14 and 15 are upstream of the gas 1 in the flow direction. The filters 14 and 15 can be used without waste if they are arranged so as to be sequentially moved to the side. The number of the filters 14 and 15 is appropriately selected in consideration of the pressure loss with respect to the gas 1 and the thickness thereof.
ここで、本発明に係るトンネル内ガス処理設備の効果を確認するために行った試験結果（実施例）を図２に示す。また、比較のため、従来のトンネル内ガス処理設備、すなわち、粗目フィルタ及び細目フィルタがない場合の試験結果（比較例）も併せて図２に示す。なお、試験条件は、下記の通りである。
Here, FIG. 2 shows test results (examples) conducted to confirm the effects of the gas treatment facility in the tunnel according to the present invention. For comparison, FIG. 2 also shows a test result (comparative example) in the case where there is no conventional tunnel gas treatment facility, that is, a coarse filter and a fine filter. The test conditions are as follows.
《ガス》
・組成－ＣＯ2 ：ベース
ＮＯ ：１．５～２．０ｐｐｍ
ＮＯ2 ：１．５～２．０ｐｐｍ
粒子 ：０．５～４．０ｍｇ／ｍ3（電気集塵器入口）
・全ガス量：８６０Ｎｍ3／ｈ
・ＧＨＳＶ：１５０００ｈ-1
・温度：３０±５℃
・湿度：７０±２０％ "gas"
Composition-CO 2 : Base NO: 1.5 to 2.0 ppm
NO 2 : 1.5-2.0ppm
Particle: 0.5-4.0mg / m 3 (Electric dust collector inlet)
・ Total gas amount: 860 Nm 3 / h
・ GHSV: 15000h -1
・ Temperature: 30 ± 5 ℃
・ Humidity: 70 ± 20%
・組成－ＣＯ2 ：ベース
ＮＯ ：１．５～２．０ｐｐｍ
ＮＯ2 ：１．５～２．０ｐｐｍ
粒子 ：０．５～４．０ｍｇ／ｍ3（電気集塵器入口）
・全ガス量：８６０Ｎｍ3／ｈ
・ＧＨＳＶ：１５０００ｈ-1
・温度：３０±５℃
・湿度：７０±２０％ "gas"
Composition-CO 2 : Base NO: 1.5 to 2.0 ppm
NO 2 : 1.5-2.0ppm
Particle: 0.5-4.0mg / m 3 (Electric dust collector inlet)
・ Total gas amount: 860 Nm 3 / h
・ GHSV: 15000h -1
・ Temperature: 30 ± 5 ℃
・ Humidity: 70 ± 20%
《粗目フィルタ》
・捕集可能粒径：２０μｍ以上
・厚さ：４０ｍｍ 《Coarse filter》
・ Capable particle size: 20 μm or more ・ Thickness: 40 mm
・捕集可能粒径：２０μｍ以上
・厚さ：４０ｍｍ 《Coarse filter》
・ Capable particle size: 20 μm or more ・ Thickness: 40 mm
《細目フィルタ》
・捕集可能粒径：１０μｍ以上
・厚さ：２０ｍｍ <Fine filter>
・ Capable particle size: 10 μm or more ・ Thickness: 20 mm
・捕集可能粒径：１０μｍ以上
・厚さ：２０ｍｍ <Fine filter>
・ Capable particle size: 10 μm or more ・ Thickness: 20 mm
図２からわかるように、比較例では、二酸化窒素除去剤による二酸化窒素除去率が、１０００時間を越えたあたりから徐々に低下し始め、２０００時間を越えたあたりから急激に低下し、３０００時間では９０％以下となってしまった。これに対し、実施例においては、二酸化窒素除去剤による二酸化窒素除去率が、２０００時間を越えたあたりから徐々に低下し始めるものの、５０００時間を越えても９０％以上の性能を維持することが確認できた。
As can be seen from FIG. 2, in the comparative example, the nitrogen dioxide removal rate by the nitrogen dioxide removing agent begins to gradually decrease from around 1000 hours, sharply decreases from around 2000 hours, and at 3000 hours. It became 90% or less. On the other hand, in the examples, the nitrogen dioxide removal rate by the nitrogen dioxide removing agent starts to gradually decrease from around 2000 hours, but the performance of 90% or more can be maintained even after 5000 hours. It could be confirmed.
本発明に係るトンネル内ガス処理設備は、従来よりも二酸化窒素吸収剤の長寿命化を図ることができるので、産業上、極めて有益に利用することができる。
Since the in-tunnel gas treatment facility according to the present invention can extend the life of the nitrogen dioxide absorbent as compared with the conventional one, it can be used in an extremely useful manner industrially.
１ ガス
１１ ダクト
１２ 電気集塵器
１３ 二酸化窒素吸収剤
１４ 粗目フィルタ
１５ 細目フィルタ 1Gas 11 Duct 12 Electric Dust Collector 13 Nitrogen Dioxide Absorber 14 Coarse Filter 15 Fine Filter
１１ ダクト
１２ 電気集塵器
１３ 二酸化窒素吸収剤
１４ 粗目フィルタ
１５ 細目フィルタ 1
Claims (2)
- トンネルの内部と外部とを連絡して当該トンネル内のガスを外部へ流通させるダクトと、
前記ダクト内に配設された電気集塵器と、
前記ダクト内の前記電気集塵器よりも前記ガスの流通方向下流側に配設された二酸化窒素吸収剤と、
前記ダクト内の前記電気集塵器と前記二酸化窒素吸収剤との間に配設されて粒径２０μｍ未満の粒子のみを捕集可能な通気性を有する細目フィルタと、
前記ダクト内の前記細目フィルタと前記電気集塵器との間に配設されて粒径２０μｍ以上の粒子を捕集可能な通気性を有する粗目フィルタと
を備えていることを特徴とするトンネル内ガス処理設備。 A duct that connects the inside and outside of the tunnel and distributes the gas in the tunnel to the outside;
An electrostatic precipitator disposed in the duct;
A nitrogen dioxide absorbent disposed downstream of the electric dust collector in the duct in the gas flow direction;
A fine filter having air permeability disposed between the electrostatic precipitator in the duct and the nitrogen dioxide absorbent and capable of collecting only particles having a particle size of less than 20 μm;
A tunnel having a breathability that is disposed between the fine filter in the duct and the electrostatic precipitator and is capable of collecting particles having a particle diameter of 20 μm or more. Gas processing equipment. - 請求項１に記載のトンネル内ガス処理設備において、
前記細目フィルタが、粒径１０μｍ以上の粒子のみを捕集可能なものである
ことを特徴とするトンネル内ガス処理設備。 In the tunnel gas treatment facility according to claim 1,
The tunnel gas processing facility, wherein the fine filter is capable of collecting only particles having a particle size of 10 μm or more.
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| JP2010-165478 | 2010-07-23 | ||
| JP2010165478A JP5638303B2 (en) | 2010-07-23 | 2010-07-23 | Tunnel gas treatment equipment |
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| WO2012011393A1 true WO2012011393A1 (en) | 2012-01-26 |
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| KR101948433B1 (en) | 2017-08-21 | 2019-02-13 | 주식회사 리트코 | Tunnel exit-standing tunnel dust collecting apparatus having anti-freezing. |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04358550A (en) * | 1991-06-05 | 1992-12-11 | Matsushita Seiko Co Ltd | Dust collector |
| JPH05123533A (en) * | 1991-11-05 | 1993-05-21 | Matsushita Seiko Co Ltd | Nitrogen oxide removing filter, and device and system thereof |
| JPH09239238A (en) * | 1996-03-07 | 1997-09-16 | Matsushita Seiko Co Ltd | Denitration apparatus |
| JP2009240973A (en) * | 2008-03-31 | 2009-10-22 | Nishimatsu Constr Co Ltd | System and method for treating exhaust gas |
| JP2009285592A (en) * | 2008-05-30 | 2009-12-10 | Panasonic Corp | Denitrification apparatus |
-
2010
- 2010-07-23 JP JP2010165478A patent/JP5638303B2/en active Active
-
2011
- 2011-07-07 WO PCT/JP2011/065534 patent/WO2012011393A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04358550A (en) * | 1991-06-05 | 1992-12-11 | Matsushita Seiko Co Ltd | Dust collector |
| JPH05123533A (en) * | 1991-11-05 | 1993-05-21 | Matsushita Seiko Co Ltd | Nitrogen oxide removing filter, and device and system thereof |
| JPH09239238A (en) * | 1996-03-07 | 1997-09-16 | Matsushita Seiko Co Ltd | Denitration apparatus |
| JP2009240973A (en) * | 2008-03-31 | 2009-10-22 | Nishimatsu Constr Co Ltd | System and method for treating exhaust gas |
| JP2009285592A (en) * | 2008-05-30 | 2009-12-10 | Panasonic Corp | Denitrification apparatus |
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| JP5638303B2 (en) | 2014-12-10 |
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