JP2000192809A - Exhaust emission control device for diesel engine - Google Patents

Exhaust emission control device for diesel engine

Info

Publication number
JP2000192809A
JP2000192809A JP10368343A JP36834398A JP2000192809A JP 2000192809 A JP2000192809 A JP 2000192809A JP 10368343 A JP10368343 A JP 10368343A JP 36834398 A JP36834398 A JP 36834398A JP 2000192809 A JP2000192809 A JP 2000192809A
Authority
JP
Japan
Prior art keywords
exhaust gas
water
filter
mixing chamber
storage tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10368343A
Other languages
Japanese (ja)
Other versions
JP3276935B2 (en
Inventor
Hitoshi Hirose
鈞 廣瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AIHO RIKUUN KK
Original Assignee
AIHO RIKUUN KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AIHO RIKUUN KK filed Critical AIHO RIKUUN KK
Priority to JP36834398A priority Critical patent/JP3276935B2/en
Publication of JP2000192809A publication Critical patent/JP2000192809A/en
Application granted granted Critical
Publication of JP3276935B2 publication Critical patent/JP3276935B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce particlelike substances such as black smoke in exhaust gas efficiently. SOLUTION: This device is constituted in such a way that a lower portion in a main body case 11 arranged vertically is used as a mixture chamber 14 and an exhaust gas filter 21 is arranged above it. Water in a water storage tank 27 is fed to each injection nozzle 19, 20 under pressure by a pump 36, a sufficient amount of water is turned into minute particles and is injected into exhaust gas so that a particlelike substance is exhaust gas is absorbed to water particle in the mixture chamber 14. The water particle containing this particlelike substance is scavenged by an exhaust gas filter 21 when it is exhausted to an upper part of the mixture chamber 14 together with exhaust gas. On the other hand, the water dropping into the lower portion of the mixture chamber 14 is recovered into the water storage tank 27 and is filtered by a filter in the water storage tank 27. In this case, since the water contained in the exhaust gas filter 21 drops into the mixture chamber 14 from a lower face of the exhaust gas filter 21, water content in the exhaust gas filter 21 does not increase excessively so that cleaning capacity of the exhaust gas filter 21 can be maintained for a long time.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ディーゼルエンジ
ンの排気に含まれる黒煙等の粒子状物質(PM)を低減
するディーゼルエンジンの排ガス浄化装置に関するもの
である。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel engine exhaust gas purifying apparatus for reducing particulate matter (PM) such as black smoke contained in exhaust gas of a diesel engine.

【0002】[0002]

【従来の技術】近年、ディーゼルエンジンから排出され
る黒煙等の粒子状物質による環境汚染が重大な社会問題
となっている。このため、排ガス中の粒子状物質を低減
することが重要な技術的課題となっている。
2. Description of the Related Art In recent years, environmental pollution by particulate matter such as black smoke discharged from a diesel engine has become a serious social problem. For this reason, reducing particulate matter in exhaust gas has become an important technical issue.

【0003】排ガス中の粒子状物質を低減する排ガス浄
化装置の公知例として、例えば特開平6−185340
号公報、特開平6−185341号公報がある。前者
(特開平6−185340号公報)は、排ガス通路中に
噴射ノズルを設け、排ガス流によって生じる負圧で噴射
ノズルから水を吸引して噴射し、攪拌室内で水粒子と排
ガスを混合して、排ガス中の粒子状物質を水の微粒子に
吸着させる。そして、この粒子状物質を含んだ水の微粒
子を、攪拌室の出口側に設けた排ガスフィルタで捕集す
ることで、排ガス中の粒子状物質を低減する。
[0003] As a known example of an exhaust gas purifying apparatus for reducing particulate matter in exhaust gas, for example, Japanese Patent Application Laid-Open No. 6-185340.
And JP-A-6-185341. The former (Japanese Patent Application Laid-Open No. 6-185340) discloses a method in which an injection nozzle is provided in an exhaust gas passage, water is sucked and injected from the injection nozzle by a negative pressure generated by the exhaust gas flow, and water particles and the exhaust gas are mixed in a stirring chamber. Then, the particulate matter in the exhaust gas is adsorbed by the fine particles of water. Then, the fine particles of water containing the particulate matter are collected by an exhaust gas filter provided on the outlet side of the stirring chamber, thereby reducing the particulate matter in the exhaust gas.

【0004】しかし、この構成では、排ガス流によって
生じる負圧で水を吸引して噴射するだけであるので、水
の噴射量が少なく、しかも、水の微粒化が不十分になっ
て排ガスとの混合が不十分となり、排ガス中の粒子状物
質を十分に低減することができないという欠点がある。
However, in this configuration, since the water is merely sucked and injected with the negative pressure generated by the exhaust gas flow, the amount of water injection is small, and the atomization of the water becomes insufficient, so that the exhaust gas and the exhaust gas may not be mixed. There is a disadvantage that the mixing becomes insufficient and the particulate matter in the exhaust gas cannot be sufficiently reduced.

【0005】そこで、後者(特開平6−185341号
公報)では、排ガス通路中に水平に配置された円筒管部
に噴射ノズルを設置し、ポンプによって貯水タンク内の
水を汲み上げて噴射ノズルに圧送することで、噴射ノズ
ルから十分な量の水を噴射すると共に、円筒管部の底部
に落下する水(粒子状物質を含んだ水)を、底部の排水
口から貯水タンク内に回収する排水管の途中に設けたフ
ィルタで濾過して粒子状物質を捕集するようにしてい
る。
Therefore, in the latter case (JP-A-6-185341), an injection nozzle is installed in a cylindrical pipe portion horizontally disposed in an exhaust gas passage, and water in a water storage tank is pumped up by a pump and fed to the injection nozzle by pressure. By doing so, a sufficient amount of water is sprayed from the spray nozzle, and the water (water containing particulate matter) that falls to the bottom of the cylindrical pipe is recovered from the bottom drain port into the water storage tank. A particulate matter is collected by filtering with a filter provided in the middle.

【0006】[0006]

【発明が解決しようとする課題】しかし、上記公報のも
のは、円筒管部の側面の出口がそのままテールパイプに
接続されているため、粒子状物質を含んだ水粒子の一部
が、排ガスの流れに乗って円筒管部の出口からテールパ
イプを通って大気中に排出されてしまうという欠点があ
る。この対策として、円筒管部の側面の出口に排ガスフ
ィルタを設け、円筒管部から側方に排出される水粒子を
排ガスフィルタで捕集することが考えられる。
However, in the above publication, since the outlet on the side surface of the cylindrical pipe portion is directly connected to the tail pipe, a part of the water particles containing the particulate matter is discharged. There is a drawback that the air is discharged from the outlet of the cylindrical tube portion to the atmosphere through the tail pipe while riding on the flow. As a countermeasure for this, it is conceivable to provide an exhaust gas filter at the outlet on the side surface of the cylindrical tube portion, and to collect water particles discharged laterally from the cylindrical tube portion with the exhaust gas filter.

【0007】しかし、この構成では、ポンプによって噴
射ノズルから多量の水を噴射すると、短時間のうちに排
ガスフィルタの含水量が多くなってしまう。このため、
短時間のうちに排ガスフィルタの排ガス浄化能力が低下
するばかりか、排ガスフィルタの排気抵抗が増大して燃
費が悪化すると共に、排気圧力によって排ガスフィルタ
から粒子状物質を含んだ水が大気中に吹き出されてしま
う欠点もある。
However, in this configuration, when a large amount of water is injected from the injection nozzle by the pump, the water content of the exhaust gas filter increases in a short time. For this reason,
In a short period of time, not only does the exhaust gas filter's exhaust gas purification capacity decrease, but also the exhaust resistance of the exhaust gas filter increases and fuel efficiency deteriorates, and water containing particulate matter is blown out of the exhaust gas filter into the atmosphere by the exhaust pressure. There is a disadvantage that it is done.

【0008】本発明はこのような事情を考慮してなされ
たものであり、従ってその目的は、長期間にわたって排
ガスフィルタによって排ガス中の粒子状物質を効果的に
低減できると共に、燃費の悪化を防止でき、しかも、粒
子状物質を含んだ水が大気中に吹き出されることを防止
できるディーゼルエンジンの排ガス浄化装置を提供する
ことにある。
[0008] The present invention has been made in view of such circumstances, and an object thereof is to provide an exhaust gas filter that can effectively reduce particulate matter in exhaust gas over a long period of time and prevent fuel efficiency from deteriorating. It is another object of the present invention to provide an exhaust gas purifying apparatus for a diesel engine, which can prevent water containing particulate matter from being blown into the atmosphere.

【0009】[0009]

【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項1のディーゼルエンジンの排ガス浄
化装置は、排ガス通路中に混合室を設けると共に、この
混合室とその入口側の排ガス通路の少なくとも一方に噴
射ノズルを設け、混合室の上方のフィルタ収納室内に耐
熱性の排ガスフィルタを収納して、混合室から上方に排
出される排ガス中の粒子状物質を排ガスフィルタで捕集
しながら、混合室の下部に溜まった水を排水口から貯水
タンク内に回収し、この貯水タンク内の水をポンプによ
って噴射ノズルに供給する構成としたものである。
According to a first aspect of the present invention, there is provided an exhaust gas purifying apparatus for a diesel engine, wherein a mixing chamber is provided in an exhaust gas passage, and the mixing chamber and an inlet side of the mixing chamber are provided. An injection nozzle is provided in at least one of the exhaust gas passages, a heat-resistant exhaust gas filter is accommodated in a filter storage chamber above the mixing chamber, and particulate matter in exhaust gas discharged upward from the mixing chamber is collected by the exhaust gas filter. Meanwhile, water collected in the lower part of the mixing chamber is recovered from a drain port into a water storage tank, and the water in the water storage tank is supplied to an injection nozzle by a pump.

【0010】この構成では、噴射ノズルから噴射した水
粒子と排ガスを混合室内で混合して排ガス中の粒子状物
質を水粒子に吸着させる。この粒子状物質を含んだ水粒
子が排ガスの流れに乗って混合室の上方に排出される際
に排ガスフィルタで捕集されることで、排ガス中の粒子
状物質が低減される。この際、混合室の下部に落下する
水は、排水口から貯水タンク内に回収し、この貯水タン
ク内の水をポンプによって噴射ノズルに圧送する。更
に、排ガスフィルタの真下が混合室となっているため、
排ガスフィルタに含まれた水は、重力によって排ガスフ
ィルタの下面から滴となって混合室内に垂れ落ちる。こ
れにより、噴射ノズルから十分な量の水を噴射しても、
排ガスフィルタの含水量が多くなりすぎず、排ガスフィ
ルタの排ガス浄化能力が良好に維持されると共に、排気
抵抗の増加が防止される。
In this configuration, the water particles and the exhaust gas injected from the injection nozzle are mixed in the mixing chamber, and the particulate matter in the exhaust gas is adsorbed on the water particles. The water particles containing the particulate matter are collected by the exhaust gas filter when being discharged above the mixing chamber along the flow of the exhaust gas, so that the particulate matter in the exhaust gas is reduced. At this time, the water falling to the lower part of the mixing chamber is recovered from the drain port into the water storage tank, and the water in the water storage tank is pumped to the injection nozzle by the pump. Furthermore, since the mixing chamber is located just below the exhaust gas filter,
The water contained in the exhaust gas filter drops as drops from the lower surface of the exhaust gas filter into the mixing chamber due to gravity. Thus, even if a sufficient amount of water is injected from the injection nozzle,
The water content of the exhaust gas filter does not become too large, the exhaust gas purifying capability of the exhaust gas filter is maintained well, and an increase in exhaust resistance is prevented.

【0011】この場合、請求項2のように、排ガスフィ
ルタを、目の細かいフィルタと目の粗いフィルタを上下
方向に交互に積層して形成すると良い。このようにすれ
ば、2種類のフィルタを用いて、粒子状物質を含んだ水
粒子を効果的に捕集できる。しかも、目の細かいフィル
タに含まれた水が目の粗いフィルタを伝って下方に流れ
落ちるようになり、排ガスフィルタの排水性が向上す
る。
In this case, it is preferable that the exhaust gas filter is formed by alternately stacking a fine filter and a coarse filter in the vertical direction. In this way, water particles containing particulate matter can be effectively collected using two types of filters. In addition, water contained in the fine-grained filter flows down along the coarse-grained filter, and the drainage of the exhaust gas filter is improved.

【0012】また、請求項3のように、排ガスフィルタ
を、フィルタ収納室に取換可能に装着されるカートリッ
ジ式にすると良い。このようにすれば、排ガスフィルタ
を簡単に取り換えることができる。
The exhaust gas filter may be of a cartridge type which is replaceably mounted in the filter storage chamber. In this way, the exhaust gas filter can be easily replaced.

【0013】ところで、排ガスフィルタは、高温の排ガ
スが通過するため、耐熱性のフィルタを使用する必要が
ある。しかし、混合室の排水口から排出される水は、貯
水タンクに回収されるまでに走行風によって冷やされ、
水温がある程度低下するため、請求項4のように、貯水
タンクに設けるフィルタは、非耐熱性のフィルタを用い
れば良い。このようにすれば、安価な非耐熱性のフィル
タによって、混合室の排水口から排出された水を濾過す
ることができる。
By the way, since a high-temperature exhaust gas passes through the exhaust gas filter, it is necessary to use a heat-resistant filter. However, the water discharged from the outlet of the mixing chamber is cooled by the traveling wind before being collected in the water storage tank,
Since the water temperature decreases to some extent, a non-heat-resistant filter may be used as the filter provided in the water storage tank. With this configuration, the water discharged from the drain of the mixing chamber can be filtered by the inexpensive non-heat-resistant filter.

【0014】また、請求項5のように、混合室の排水口
を、底面よりも少し上方に形成するようにすると良い。
このようにすれば、混合室の底部に、排水口の高さまで
水を貯溜できるため、この水の冷却効果によって混合室
や排ガスフィルタの過熱を防止することができる。
It is preferable that the drain of the mixing chamber is formed slightly above the bottom surface.
With this configuration, since water can be stored at the bottom of the mixing chamber up to the height of the drain port, overheating of the mixing chamber and the exhaust gas filter can be prevented by the cooling effect of the water.

【0015】[0015]

【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。排ガス浄化装置の本体ケース11
は、例えば大型トラックの荷台の下方に垂直に配置され
た円筒管により形成され、その上下開口部に、それぞれ
上蓋12と底板13がボルト(図示せず)で締付固定さ
れている。この本体ケース11内は、上下2室に分けら
れ、下方が混合室14で、上方がフィルタ収納室15と
なっている。混合室14の側面の入口14aには、ディ
ーゼルエンジン(図示せず)の排気管16に連結された
排ガス導入管17が接続され、上蓋12には、テールパ
イプ18が設けられている。これにより、排ガス導入管
17から混合室14内に導入される排ガスは、混合室1
4内を旋回しながら上方のフィルタ収納室15を通って
テールパイプ18から大気中に排出される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Body case 11 of exhaust gas purifier
Is formed, for example, by a cylindrical tube vertically arranged below a cargo bed of a large truck, and an upper lid 12 and a bottom plate 13 are respectively fastened and fixed to upper and lower openings thereof by bolts (not shown). The inside of the main body case 11 is divided into two upper and lower chambers, and a lower part is a mixing chamber 14 and an upper part is a filter storage chamber 15. An exhaust gas introduction pipe 17 connected to an exhaust pipe 16 of a diesel engine (not shown) is connected to an inlet 14 a on a side surface of the mixing chamber 14, and a tail pipe 18 is provided in the upper lid 12. As a result, the exhaust gas introduced into the mixing chamber 14 from the exhaust gas introduction pipe 17
The air is exhausted from the tail pipe 18 into the atmosphere through the upper filter storage chamber 15 while turning inside the inside 4.

【0016】混合室14と排ガス導入管17には、それ
ぞれ水を微粒化して噴射する噴射ノズル19,20が取
り付けられている。また、フィルタ収納室15内には、
カートリッジ式の耐熱性の排ガスフィルタ21が取換可
能に装着されている。この排ガスフィルタ21は、目の
細かいフィルタ22と目の粗いフィルタ23を上下方向
に交互に積層して構成され、目の細かいフィルタ22は
例えばセラミック繊維製のオイルフェンスにより形成さ
れ、目の粗いフィルタ23は、例えば螺旋状に曲がった
細長いステンレス切削片を寄せ集めて形成されている。
Injection nozzles 19 and 20 for atomizing and injecting water are attached to the mixing chamber 14 and the exhaust gas introduction pipe 17, respectively. In the filter storage chamber 15,
A cartridge-type heat-resistant exhaust gas filter 21 is replaceably mounted. The exhaust gas filter 21 is configured by alternately stacking a fine-grained filter 22 and a coarse-grained filter 23 in the vertical direction. The fine-grained filter 22 is formed by, for example, an oil fence made of ceramic fiber. 23 is formed by gathering, for example, elongated stainless steel cutting pieces that are spirally bent.

【0017】一方、混合室14の底面よりも少し上方に
は、混合室14の下部に溜まった水を排出する排水口2
5が形成されている。これにより、混合室14の底部
に、排水口25の高さまで水を貯溜できるようになって
いる。排水口25から排出される水は、排水管26を通
して貯水タンク27に回収される。
On the other hand, slightly above the bottom surface of the mixing chamber 14, a drain port 2 for discharging water collected in the lower part of the mixing chamber 14 is provided.
5 are formed. Thus, water can be stored at the bottom of the mixing chamber 14 up to the height of the drain port 25. The water discharged from the drain 25 is collected in a water storage tank 27 through a drain pipe 26.

【0018】図2に示すように、貯水タンク27内に
は、上流側から順に第1のタンク室28、第2のタンク
室29及び第3のタンク室30が形成されている。第1
のタンク室28の上方には、多数の水抜孔31を有する
ステンレス板32が設けられ、このステンレス板32上
に、非耐熱性の第1のフィルタ33が配置されている。
更に、第1のタンク室28と第2のタンク室29の間
に、非耐熱性の第2のフィルタ34が配置され、第2の
タンク室29と第3のタンク室30の間に、非耐熱性の
第3のフィルタ35が配置されている。また、第3のタ
ンク室30の上方部に電動式のポンプ36が設置され、
このポンプ36の吸込み管37が第3のタンク室30内
に引き込まれている。このポンプ36に内蔵された駆動
モータは、車載バッテリから電源が供給される。
As shown in FIG. 2, a first tank chamber 28, a second tank chamber 29, and a third tank chamber 30 are formed in the water storage tank 27 in this order from the upstream side. First
A stainless steel plate 32 having a large number of drain holes 31 is provided above the tank chamber 28, and a non-heat-resistant first filter 33 is disposed on the stainless steel plate 32.
Further, a non-heat-resistant second filter 34 is disposed between the first tank chamber 28 and the second tank chamber 29, and a non-heat-resistant second filter 34 is disposed between the second tank chamber 29 and the third tank chamber 30. A heat-resistant third filter 35 is provided. Further, an electric pump 36 is installed above the third tank chamber 30,
The suction pipe 37 of the pump 36 is drawn into the third tank chamber 30. The drive motor incorporated in the pump 36 is supplied with power from a vehicle-mounted battery.

【0019】排水管26を流れてくる水は、第1のフィ
ルタ33の上方に排出され、第1のフィルタ33→第1
のタンク室28→第2のフィルタ34→第2のタンク室
29→第3のフィルタ35→第3のタンク室30の順に
流れ、この第3のタンク室30に貯溜された水が、ポン
プ36によって汲み上げられて送水管38を通して各噴
射ノズル19,20に圧送される。
The water flowing through the drain pipe 26 is discharged above the first filter 33, and the first filter 33 → the first filter 33.
Flows in the order of the tank chamber 28 → the second filter 34 → the second tank chamber 29 → the third filter 35 → the third tank chamber 30. The water stored in the third tank chamber 30 is And pumped through the water pipe 38 to each of the injection nozzles 19 and 20.

【0020】また、貯水タンク27は、上蓋39及び中
蓋40を取り外せば、第1のフィルタ33、第2のフィ
ルタ34及び第3のフィルタ35を取り換えることがで
きるようになっている。
The water storage tank 27 can be replaced with the first filter 33, the second filter 34 and the third filter 35 by removing the upper lid 39 and the inner lid 40.

【0021】以上のように構成した排ガス浄化装置で
は、ディーゼルエンジンの運転中は、ポンプ36を駆動
して貯水タンク27(第3のタンク室30)内の水を各
噴射ノズル19,20に圧送し、排ガス導入管17と混
合室14の2箇所で、十分な量の水を微粒化して排ガス
に噴射する。そして、排ガスが排ガス導入管17から円
筒形の混合室14に対して直角方向に流れ込むことによ
り、排ガスが混合室14の内周面に沿って旋回しながら
上昇する。これにより、混合室14内で排ガスと水粒子
との混合攪拌を促進し、排ガス中の粒子状物質を水粒子
に積極的に吸着させる。
In the exhaust gas purifying apparatus configured as described above, during operation of the diesel engine, the pump 36 is driven to pump water in the water storage tank 27 (third tank chamber 30) to each of the injection nozzles 19 and 20. Then, a sufficient amount of water is atomized and discharged into the exhaust gas at two places, the exhaust gas introduction pipe 17 and the mixing chamber 14. Then, the exhaust gas flows from the exhaust gas introduction pipe 17 in a direction perpendicular to the cylindrical mixing chamber 14, so that the exhaust gas rises while turning along the inner peripheral surface of the mixing chamber 14. Thereby, the mixing and stirring of the exhaust gas and the water particles is promoted in the mixing chamber 14, and the particulate matter in the exhaust gas is positively adsorbed on the water particles.

【0022】この粒子状物質を含んだ水粒子は、排ガス
の流れに乗って混合室14から上方の排ガスフィルタ2
1を通過する際に、排ガスフィルタ21の2種類のフィ
ルタ22,23によって効果的に捕集され、テールパイ
プ18から排出される排ガス中の粒子状物質が低減され
る。また、混合室14内に落下する水は、排水口25か
ら貯水タンク27内に回収し、貯水タンク27内で各フ
ィルタ33〜35を通過する際に、濾過されて粒子状物
質が捕集される。
The water particles containing the particulate matter ride on the flow of the exhaust gas and pass from the mixing chamber 14 to the upper exhaust gas filter 2.
When passing through the exhaust gas filter 1, the two types of filters 22 and 23 of the exhaust gas filter 21 are effectively collected, and the particulate matter in the exhaust gas discharged from the tail pipe 18 is reduced. The water falling into the mixing chamber 14 is collected from the drain port 25 into the water storage tank 27, and is filtered to collect particulate matter when passing through each of the filters 33 to 35 in the water storage tank 27. You.

【0023】この場合、2箇所の噴射ノズル19,20
から十分な量の水を噴射するが、本実施形態では、排ガ
スフィルタ21の真下が混合室14となっているため、
排ガスフィルタ21に含まれた水は、重力によって排ガ
スフィルタ21の下面から滴となって混合室14内に垂
れ落ちる。しかも、排ガスフィルタ21は、目の細かい
フィルタ22に含まれた水を目の粗いフィルタ23を伝
って下方に流れ落とすことができるため、目の細かいフ
ィルタ22を使用しているにも拘らず、排ガスフィルタ
21の良好な排水性を確保できる。
In this case, two injection nozzles 19, 20
However, in the present embodiment, since the mixing chamber 14 is located immediately below the exhaust gas filter 21,
The water contained in the exhaust gas filter 21 drips into the mixing chamber 14 from the lower surface of the exhaust gas filter 21 due to gravity. Moreover, since the exhaust gas filter 21 can cause water contained in the fine-grained filter 22 to flow downward through the coarse-grained filter 23, the exhaust gas filter 21 uses the fine-grained filter 22, Good drainage properties of the exhaust gas filter 21 can be secured.

【0024】このため、噴射ノズル19,20から十分
な量の水を噴射しても、排ガスフィルタ21の含水量が
多くなりすぎず、長期間にわたって排ガスフィルタ21
によって排ガス中の粒子状物質を効果的に低減できると
共に、排気抵抗の増加を防止でき、燃費を向上できる。
しかも、排ガス導入管17から混合室14内に横方向に
流れ込む排ガスの流れは、混合室14の円周側面に沿っ
て旋回しながら流れ方向を徐々に上向きに変えて排ガス
フィルタ21に向かうため、排ガスフィルタ21に加わ
る排ガスの動圧を低減することができ、この動圧低減効
果と上述した排ガスフィルタ21の含水量低減効果と相
俟って、排ガスフィルタ21から粒子状物質を含んだ水
が大気中に吹き出されることを効果的に防止できる。
For this reason, even if a sufficient amount of water is injected from the injection nozzles 19 and 20, the water content of the exhaust gas filter 21 does not become too large, and the exhaust gas filter 21
As a result, the particulate matter in the exhaust gas can be effectively reduced, the increase in exhaust resistance can be prevented, and the fuel efficiency can be improved.
Moreover, since the flow of the exhaust gas flowing from the exhaust gas introduction pipe 17 into the mixing chamber 14 in the lateral direction changes toward the exhaust gas filter 21 while gradually turning the flow direction upward while rotating along the circumferential side surface of the mixing chamber 14, The dynamic pressure of the exhaust gas applied to the exhaust gas filter 21 can be reduced, and together with this dynamic pressure reducing effect and the above-described effect of reducing the water content of the exhaust gas filter 21, water containing particulate matter is discharged from the exhaust gas filter 21. It can be effectively prevented from being blown out into the atmosphere.

【0025】本発明者は、上記実施形態の排ガス浄化装
置の粒子状物質低減効果を評価するために、テールパイ
プ18から排出される排ガス中の粒子状物質の量を測定
する試験を行った。その結果、上記実施形態の排ガス浄
化装置を用いたシステムでは、排ガス中の粒子状物質を
上記排気ガス浄化装置を用いない場合の約1/2〜1/
3程度まで低減できることが確認された。
The present inventor conducted a test for measuring the amount of particulate matter in the exhaust gas discharged from the tail pipe 18 in order to evaluate the particulate matter reducing effect of the exhaust gas purifying apparatus of the above embodiment. As a result, in the system using the exhaust gas purification device of the above embodiment, the particulate matter in the exhaust gas is reduced to about 1/2 to 1 /
It was confirmed that it could be reduced to about 3.

【0026】また、上記実施形態では、排ガスフィルタ
21をフィルタ収納室15に取換可能に装着されるカー
トリッジ式にしたので、排ガスフィルタ21の取換時に
は、上蓋12を取り外せば、排ガスフィルタ21を簡単
に取り換えることができる。しかも、貯水タンク27内
の各フィルた33〜35も、上蓋39及び中蓋40を取
り外せば、取り換え可能であり、総じて、メンテナンス
性が良い。
Further, in the above-described embodiment, the exhaust gas filter 21 is of a cartridge type which is removably mounted in the filter storage chamber 15. Therefore, when the exhaust gas filter 21 is replaced, the exhaust gas filter 21 can be removed by removing the upper lid 12. It can be easily replaced. Moreover, each of the fills 33 to 35 in the water storage tank 27 can be replaced by removing the upper lid 39 and the inner lid 40, so that the maintainability is generally good.

【0027】更に、上記実施形態では、混合室14の排
水口25から排出される水は、貯水タンク27に回収さ
れるまでに走行風によって冷やされ、水温がある程度低
下することを考慮して、貯水タンク27内の各フィルタ
33〜35を非耐熱性としたので、フィルタ33〜35
のコストを低減できる。尚、排水管26の途中部にフィ
ルタ収納部を設け、そこに非耐熱性のフィルタを取換可
能に設けるようにしても良い。
Further, in the above embodiment, the water discharged from the drain port 25 of the mixing chamber 14 is cooled by the traveling wind before being collected in the water storage tank 27, and the water temperature is reduced to some extent. Since the filters 33 to 35 in the water storage tank 27 are made non-heat resistant, the filters 33 to 35
Cost can be reduced. A filter housing may be provided in the middle of the drain pipe 26, and a non-heat-resistant filter may be replaceably provided there.

【0028】また、上記実施形態では、混合室14の排
水口25を、底面よりも少し上方に形成し、混合室14
の底部に、排水口25の高さまで水を貯溜するようにし
たので、この水の冷却効果によって混合室14や排ガス
フィルタ21の過熱を防止することができる。
In the above embodiment, the drain port 25 of the mixing chamber 14 is formed slightly above the bottom surface, and
Since the water is stored at the bottom of the container up to the height of the drain port 25, overheating of the mixing chamber 14 and the exhaust gas filter 21 can be prevented by the cooling effect of the water.

【0029】尚、上記実施形態では、排ガスフィルタ2
1を2種類のフィルタ22,23で構成したが、排ガス
フィルタ21は、1種類又は3種類以上のフィルタで構
成しても良く、要は、排ガス浄化性と排水性を確保でき
れば良い。
In the above embodiment, the exhaust gas filter 2
Although the exhaust gas filter 21 is composed of two types of filters 22 and 23, the exhaust gas filter 21 may be composed of one type or three or more types of filters.

【0030】また、上記実施形態では、噴射ノズル1
9,20を混合室14とその入口側の排ガス導入管17
に1本ずつ設置したが、複数本設置するようにしても良
い。また、混合室14と排ガス導入管17のどちらか一
方に噴射ノズルを設置するようにしても良い。更に、エ
ンジンの運転条件によって粒子状物質の排出量が変わる
ことを考慮して、運転条件に応じて水の噴射量を変化さ
せるようにしても良い。
In the above embodiment, the injection nozzle 1
9 and 20 are connected to the mixing chamber 14 and the exhaust gas introduction pipe 17 on the inlet side thereof.
Are installed one by one, but a plurality of them may be installed. Further, an injection nozzle may be provided in one of the mixing chamber 14 and the exhaust gas introduction pipe 17. Further, in consideration of the fact that the emission amount of the particulate matter changes depending on the operating conditions of the engine, the water injection amount may be changed according to the operating conditions.

【0031】また、粒子状物質やその他の排ガス中の有
害成分の吸着を促進させる添加物を貯水タンク27内の
水に混合しても良い。その他、本発明の排ガス浄化装置
は、トラックに限定されず、バスや、建設機械等、ディ
ーゼルエンジンを動力源とする種々の車両、機械、装置
に組み付けても良い。
Further, an additive for promoting the adsorption of particulate matter and other harmful components in the exhaust gas may be mixed with the water in the water storage tank 27. In addition, the exhaust gas purifying apparatus of the present invention is not limited to trucks, but may be assembled to various vehicles, machines, and devices using a diesel engine as a power source, such as buses and construction machines.

【0032】[0032]

【発明の効果】以上の説明から明らかなように、本発明
の請求項1の排ガス浄化装置によれば、混合室の上方に
排ガスフィルタを配置し、この排ガスフィルタによって
排ガスの流れに乗って混合室の上方に排出される水粒子
(粒状物質を吸着した水粒子)を捕集するようにしたの
で、排ガスフィルタに含まれた水を混合室内に垂れ落と
すことができ、噴射ノズルから十分な量の水を噴射して
も、排ガスフィルタの含水量が多くなりすぎず、長期間
にわたって排ガスフィルタによって排ガス中の粒子状物
質を効果的に低減できると共に、燃費の悪化や排ガスフ
ィルタからの水の吹き出しも防止できる。
As is apparent from the above description, according to the exhaust gas purifying apparatus of the first aspect of the present invention, the exhaust gas filter is disposed above the mixing chamber, and the exhaust gas is mixed with the exhaust gas by the exhaust gas filter. Since water particles (water particles adsorbing particulate matter) discharged above the chamber are collected, water contained in the exhaust gas filter can be dripped into the mixing chamber, and a sufficient amount can be discharged from the injection nozzle. Even if water is injected, the water content of the exhaust gas filter does not become too large, the exhaust gas filter can effectively reduce the particulate matter in the exhaust gas for a long time, and the fuel efficiency deteriorates and water is blown out from the exhaust gas filter. Can also be prevented.

【0033】また、請求項2では、排ガスフィルタを目
の細かいフィルタと目の粗いフィルタを交互に積層して
形成したので、2種類のフィルタを用いて粒子状物質を
含んだ水粒子を効果的に捕集できると共に、目の粗いフ
ィルタによって排水性も向上することができる。
In the second aspect, the exhaust gas filter is formed by alternately laminating a fine filter and a coarse filter, so that two types of filters are used to effectively remove water particles containing particulate matter. And the drainage property can be improved by the coarse filter.

【0034】更に、請求項3では、排ガスフィルタをフ
ィルタ収納室に取換可能に装着されるカートリッジ式に
したので、排ガスフィルタを簡単に取り換えることがで
き、メンテナンス性を向上することができる。
Further, according to the third aspect, the exhaust gas filter is of a cartridge type which is removably mounted in the filter storage chamber. Therefore, the exhaust gas filter can be easily replaced, and the maintainability can be improved.

【0035】一方、請求項4では、貯水タンクに、非耐
熱性のフィルタを設けるようにしたので、安価な非耐熱
性のフィルタによって混合室の排水口から排出された水
を濾過することができ、貯水タンクのフィルタを低コス
ト化することができる。
On the other hand, since the non-heat-resistant filter is provided in the water storage tank, the water discharged from the discharge port of the mixing chamber can be filtered by an inexpensive non-heat-resistant filter. In addition, the cost of the filter of the water storage tank can be reduced.

【0036】また、請求項5のように、混合室の排水口
を、底面よりも少し上方に形成するようにしたので、混
合室の底部に貯溜する水の冷却効果によって混合室や排
ガスフィルタの過熱を防止することができる。
Also, the drain of the mixing chamber is formed slightly above the bottom surface, so that the cooling effect of the water stored at the bottom of the mixing chamber can reduce the amount of water discharged from the mixing chamber and the exhaust gas filter. Overheating can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施形態における排ガス浄化装置全
体の概略構成を示す縦断面図
FIG. 1 is a longitudinal sectional view showing a schematic configuration of an entire exhaust gas purifying apparatus according to an embodiment of the present invention.

【図2】貯水タンクの縦断面図FIG. 2 is a longitudinal sectional view of a water storage tank.

【符号の説明】[Explanation of symbols]

11…本体ケース、14…混合室、15…フィルタ収納
室、16…排気管、17…排ガス導入管、18…テール
パイプ、19,20…噴射ノズル、21…排ガスフィル
タ、22…目の細かいフィルタ、23…目の粗いフィル
タ、25…排水口、26…排水管、27…貯水タンク、
28〜30…タンク室、33〜35…フィルタ、36…
ポンプ、38…送水管。
DESCRIPTION OF SYMBOLS 11 ... Main body case, 14 ... Mixing chamber, 15 ... Filter storage chamber, 16 ... Exhaust pipe, 17 ... Exhaust gas introduction pipe, 18 ... Tail pipe, 19, 20 ... Injection nozzle, 21 ... Exhaust gas filter, 22 ... Fine filter , 23 ... coarse filter, 25 ... drain outlet, 26 ... drain pipe, 27 ... water storage tank,
28-30: tank chamber, 33-35: filter, 36 ...
Pump, 38 ... water pipe.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 ディーゼルエンジンの排ガス通路中に設
けられた混合室と、 前記混合室とその入口側の排ガス通路の少なくとも一方
に設けられ、水を微粒化して排ガスに噴射する噴射ノズ
ルと、 前記混合室の上方に形成されたフィルタ収納室内に収納
され、前記混合室から上方に排出される排ガス中の黒煙
等の粒子状物質を除去する耐熱性の排ガスフィルタと、 前記混合室の下部に溜まった水を排出する排水口と、 前記排水口から排出された水を回収する貯水タンクと、 前記貯水タンク内に貯溜された水を前記噴射ノズルに圧
送するポンプとを備えていることを特徴とするディーゼ
ルエンジンの排ガス浄化装置。
A mixing chamber provided in an exhaust gas passage of a diesel engine; an injection nozzle provided in at least one of the mixing chamber and an exhaust gas passage on an inlet side thereof for atomizing water and injecting water into exhaust gas; A heat-resistant exhaust gas filter that is stored in a filter storage chamber formed above the mixing chamber and removes particulate matter such as black smoke in exhaust gas discharged upward from the mixing chamber; A drain port for discharging accumulated water, a water storage tank for collecting water discharged from the drain port, and a pump for pressure-feeding the water stored in the water storage tank to the injection nozzle. Exhaust gas purification device for diesel engines.
【請求項2】 前記排ガスフィルタは、目の細かいフィ
ルタと目の粗いフィルタを上下方向に交互に積層して構
成していることを特徴とする請求項1に記載のディーゼ
ルエンジンの排ガス浄化装置。
2. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the exhaust gas filter is configured by alternately stacking fine filters and coarse filters in the vertical direction.
【請求項3】 前記排ガスフィルタは、前記フィルタ収
納室に取換可能に装着されるカートリッジ式のフィルタ
であることを特徴とする請求項1又は2に記載のディー
ゼルエンジンの排ガス浄化装置。
3. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the exhaust gas filter is a cartridge type filter that is replaceably mounted in the filter storage chamber.
【請求項4】 前記貯水タンクには、前記排水口から排
出された水を濾過する非耐熱性のフィルタが設けられて
いることを特徴とする請求項1乃至3のいずれかに記載
のディーゼルエンジンの排ガス浄化装置。
4. The diesel engine according to claim 1, wherein the water storage tank is provided with a non-heat-resistant filter for filtering water discharged from the drain port. Exhaust gas purification equipment.
【請求項5】 前記排水口は、前記混合室の底面よりも
少し上方に形成されていることを特徴とする請求項1乃
至4のいずれかに記載のディーゼルエンジンの排ガス浄
化装置。
5. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the drain port is formed slightly above a bottom surface of the mixing chamber.
JP36834398A 1998-12-25 1998-12-25 Exhaust gas purification equipment for diesel engines Expired - Fee Related JP3276935B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36834398A JP3276935B2 (en) 1998-12-25 1998-12-25 Exhaust gas purification equipment for diesel engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36834398A JP3276935B2 (en) 1998-12-25 1998-12-25 Exhaust gas purification equipment for diesel engines

Publications (2)

Publication Number Publication Date
JP2000192809A true JP2000192809A (en) 2000-07-11
JP3276935B2 JP3276935B2 (en) 2002-04-22

Family

ID=18491580

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3276935B2 (en)

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WO2004067926A1 (en) * 2003-01-31 2004-08-12 Aktina Limited Diesel particulate removal device
FR2880383A1 (en) * 2005-01-06 2006-07-07 Olivier Raymond Salelles Pollutant e.g. nitrogen oxide, reducing device for e.g. four stroke petrol engine, has electric pump injecting water/pollutant mixture under pressure in combustion chamber when engine operating conditions favor nitrogen oxide/soot emission
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