JP2000027627A - Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device - Google Patents

Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device

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Publication number
JP2000027627A
JP2000027627A JP10197181A JP19718198A JP2000027627A JP 2000027627 A JP2000027627 A JP 2000027627A JP 10197181 A JP10197181 A JP 10197181A JP 19718198 A JP19718198 A JP 19718198A JP 2000027627 A JP2000027627 A JP 2000027627A
Authority
JP
Japan
Prior art keywords
reducing agent
temperature
storage tank
exhaust
exhaust gas
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.)
Pending
Application number
JP10197181A
Other languages
Japanese (ja)
Inventor
Mitsuru Hosoya
満 細谷
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.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
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 Hino Motors Ltd filed Critical Hino Motors Ltd
Priority to JP10197181A priority Critical patent/JP2000027627A/en
Publication of JP2000027627A publication Critical patent/JP2000027627A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/306—Preheating additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a device for preventing the freezing of the liquid reducing agent to be injected for supply to the upstream of the exhaust gas cleaning catalyst arranged in an exhaust system formed of an exhaust manifold, an exhaust pipe and a muffler of an internal combustion engine such as a diesel engine at cold time in a storage tank and a supplying pipeline. SOLUTION: A heating wire 9-2 is arranged over or a main part of a storage tank 7 and a supplying pipeline for the liquid reducing agent, and an enveloping layer of the heat insulating material is provided thereon, and furthermore, a heating wire heating means 9-1 is provided in the storage tank 7 at need, and these heating wires are electrified and electrifying is cut from outside in response to the atmospheric temperature and/or reducing agent temperature so as to maintain the appropriate temperature range for preventing the freezing of the liquid reducing agent.

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
ン等の内燃機関の排気マニホールド、排気管、マフラか
らなる排気系内に配置された排気ガス浄化用触媒の上流
側に噴射供給される液体還元剤をその貯蔵タンク及び供
給管系において凍結から防ぐ装置手段に関し、またその
ような装置手段を組込んだ排気ガス浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid reducing agent injected and supplied to an upstream side of an exhaust gas purifying catalyst disposed in an exhaust system including an exhaust manifold, an exhaust pipe, and a muffler of an internal combustion engine such as a diesel engine. To prevent freezing in the storage tank and the supply pipe system, and to an exhaust gas purification device incorporating such a device.

【０００２】[0002]

【従来の技術】内燃機関、例えばディーゼルエンジンの
排気ガスに含まれるＮＯｘを触媒を用いて還元しＮＯｘ
含量を低減することにより、排気ガスを浄化する際に、
その還元触媒の上流側に必要に応じて還元剤を噴射供給
し、所要の還元反応を支持し、促進し、確保することが
なされている。2. Description of the Related Art NOx contained in exhaust gas of an internal combustion engine, for example, a diesel engine, is reduced by using a catalyst to produce NOx.
By purifying the exhaust gas by reducing the content,
A reducing agent is injected and supplied as needed to the upstream side of the reduction catalyst to support, promote and secure a required reduction reaction.

【０００３】還元剤として代表的なものは、炭化水素類
であり、実用的にはディーゼルエンジン燃料である軽油
を使用する。しかしながら、軽油を使用することによ
り、燃料消費量が増加する問題が生じる。[0003] Typical reducing agents are hydrocarbons, and light oil which is a diesel engine fuel is practically used. However, the use of light oil causes a problem that fuel consumption increases.

【０００４】最近は、そのような炭化水素類、殊に軽油
の代りに、さらに還元効率の良い還元剤として使用しう
る可能性のある物質が提案されてきており、入手容易性
や価格などの経済的な面、あるいは取扱い容易性や還元
性能等の技術的な面から見てこの目的に沿う幾つかの具
体的な候補として挙げられるものの例としては、低級ア
ルカン類、窒素化合物類（アンモニア、尿素、ヒドラジ
ン、アンモニウム塩等）、Ｈ2、一酸化炭素（ＣＯ）等
である。[0004] Recently, instead of such hydrocarbons, especially gas oil, a substance which may be used as a reducing agent having a higher reduction efficiency has been proposed. Examples of some specific candidates for this purpose from the economical point of view or technical aspects such as ease of handling and reduction performance include lower alkanes, nitrogen compounds (ammonia, Urea, hydrazine, ammonium salts, etc.), H 2 , carbon monoxide (CO) and the like.

【０００５】これらの中の尿素を水に溶解した水溶液が
ＮＯｘ還元触媒と併用されたときに高効率の還元性能を
示すこと、ならびに還元触媒の使用寿命等の性質に悪影
響を与えないこと、入手が容易で比較的に低価値である
こと、非毒性であること、あるいは液体であることから
噴射のときの軽量制御性及び取扱い性にすぐれているこ
と等の利点が見出されており、排気ガス浄化用還元剤と
して有望視されている。しかしながら尿素水溶液は０℃
付近で凍結してしまうので、寒冷時には噴射供給不能と
なる実用上の重大な欠点をもつ。従って尿素水溶液から
なる排気ガス浄化用還元剤を実用化するにはその寒冷時
の凍結を防止する手段を適用する必要がある。[0005] Among them, an aqueous solution in which urea is dissolved in water exhibits high reduction performance when used in combination with a NOx reduction catalyst, and does not adversely affect the properties such as the service life of the reduction catalyst. It has advantages such as easy and relatively low value, non-toxicity, and excellent controllability and handling at the time of injection because of being liquid. Promising as a reducing agent for gas purification. However, urea aqueous solution is 0 ° C
Since it freezes in the vicinity, it has a serious practical disadvantage that it is impossible to supply the fuel in cold weather. Therefore, in order to put the reducing agent for purifying exhaust gas comprising an aqueous urea solution into practical use, it is necessary to apply means for preventing the freezing during cold.

【０００６】[0006]

【発明が解決しようとする課題】従って本発明の第１の
目的は、ディーゼルエンジン等の内燃機関の排気マニホ
ールド、排気管、マフラからなる排気系内に配置された
排気ガス浄化用（ＮＯｘ還元用）触媒の上流側に噴射供
給される液体還元剤を寒冷時にその貯蔵タンク及び供給
管系において凍結から防止する装置手段を提供すること
である。本発明のさらなる目的は、そのような還元剤凍
結防止手段を組込んだ排気ガス浄化装置を提供すること
である。Accordingly, a first object of the present invention is to purify an exhaust gas (for NOx reduction) disposed in an exhaust system including an exhaust manifold, an exhaust pipe, and a muffler of an internal combustion engine such as a diesel engine. The object of the present invention is to provide a device for preventing the liquid reducing agent injected and supplied to the upstream side of the catalyst from freezing in the storage tank and the supply pipe system thereof in cold weather. It is a further object of the present invention to provide an exhaust gas purification device incorporating such a reducing agent freezing prevention means.

【０００７】[0007]

【課題を解決するための手段】本発明は、内燃機関の排
気マニホールド、排気管、マフラからなる排気系内に配
置された排気ガス浄化用触媒の上流側に噴射供給される
液体還元剤をその貯蔵タンク及びポンプを含む供給管系
において凍結から防ぐ保温装置であって：該液体還元剤
貯蔵タンク及びポンプを含む供給管系の外表面の全体な
いし主要部分にわたって電熱線を配置し、その上に断熱
材の包囲層を設け、液体還元剤温度及び／または外気温
に応じて電熱線に外部電源から通電し、そしてその通電
を遮断し、液体還元剤の温度を凍結を防止するのに適切
な温度範囲に維持する構成としたことを特徴とする上記
保温装置を提供する。SUMMARY OF THE INVENTION The present invention provides a liquid reducing agent which is injected and supplied to an upstream side of an exhaust gas purifying catalyst disposed in an exhaust system including an exhaust manifold, an exhaust pipe, and a muffler of an internal combustion engine. A heat insulating device for preventing freezing in a supply pipe system including a storage tank and a pump, wherein a heating wire is disposed over the entire or main part of an outer surface of the supply pipe system including the liquid reducing agent storage tank and a pump, and the heating wire is disposed thereon. Provide an enclosing layer of heat insulating material, energize the heating wire from an external power source according to the temperature of the liquid reducing agent and / or the outside temperature, and cut off the energization to prevent the temperature of the liquid reducing agent from freezing. The above-mentioned heat retention device is characterized in that it is configured to be maintained in a temperature range.

【０００８】上記の装置において、還元剤貯蔵タンク内
にも電熱線加熱体を挿入設置して貯蔵タンク内の還元剤
を外部電源からの適宜な通電及びその遮断することによ
り保温を行なうこともできる。In the above-described apparatus, a heating element can be inserted in the reducing agent storage tank and inserted into the reducing agent storage tank so that the reducing agent in the storage tank is appropriately energized from an external power source and cut off to maintain the temperature. .

【０００９】本発明装置において保温されるべき還元剤
は、寒冷時に凍結するおそれのある液体還元剤であり、
例えば水性溶液の形の還元剤であり、具体的には尿素水
溶液、アンモニア水溶液、あるいはその他の還元剤水溶
液である。The reducing agent to be kept warm in the apparatus of the present invention is a liquid reducing agent that may freeze in cold weather,
For example, a reducing agent in the form of an aqueous solution, specifically, an aqueous urea solution, an aqueous ammonia solution, or another aqueous reducing agent solution.

【００１０】本発明装置では電熱線加熱方式であるた
め、迅速な加熱が可能であり、貯蔵タンク内の還元剤の
温度及び／または外気温をモニタリングして、予め定め
た値（個々の液体還元剤の凍結温度に依存する）の温度
にまで降下したときに、外部電源（例えばバッテリー）
から電熱線に通電し、予め定めた上限温度になったとき
に通電を遮断する。例えば尿素水溶液からなる還元剤の
場合には、ほぼ０℃ないし５０℃の範囲に還元剤温度が
維持されるように制御するのが一般的であろう。[0010] Since the apparatus of the present invention employs a heating wire heating method, rapid heating is possible, and the temperature of the reducing agent in the storage tank and / or the outside air temperature is monitored to determine a predetermined value (for individual liquid reduction). External power (eg battery) when the temperature drops to the temperature (depending on the freezing temperature of the agent)
Then, the heating wire is energized, and the energization is cut off when the temperature reaches a predetermined upper limit temperature. For example, in the case of a reducing agent composed of an aqueous urea solution, it will generally be controlled to maintain the reducing agent temperature in a range of approximately 0 ° C. to 50 ° C.

【００１１】本発明はさらに、内燃機関の排気マニホー
ルド、排気管、マフラからなる排気系内に排気ガス浄化
用触媒とその触媒の上流側において液体還元剤を噴射供
給する還元剤供給手段を備えた排気ガス浄化装置におい
て：該還元剤供給手段が排気管内温度センサ、還元剤噴
射ノズル、還元剤供給パイプ、還元剤供給ポンプ、還元
剤貯蔵タンク、貯蔵還元剤温度センサを備え：さらにそ
の還元剤供給手段が外部電源にスイッチを介して接続さ
れ還元剤貯蔵タンク内に挿入設置された電熱線加熱体、
及び／または外部電源にスイッチを介して接続され上記
還元剤供給パイプ、還元剤供給ポンプ及び還元剤貯蔵タ
ンクからなる還元剤供給系の外表面の少なくとも一部分
ないし全体にわたって配線された電熱線加熱体及びその
上を包囲した断熱材層を備え、還元剤貯蔵タンク内の還
元剤温度がその凍結温度付近にまで降下したことが温度
センサで検出されたときに前記電熱線加熱体に外部電源
から通電し、そして還元剤温度が所定の上限温度である
ことが温度センサで検出されたときにその通電を遮断す
ることにより、液体還元剤の温度を凍結を防止するのに
適切な温度範囲に維持することを特徴とする上記排気ガ
ス浄化装置を提供する。The present invention further comprises a catalyst for purifying exhaust gas and a reducing agent supply means for injecting a liquid reducing agent upstream of the catalyst into an exhaust system comprising an exhaust manifold, an exhaust pipe and a muffler of the internal combustion engine. In the exhaust gas purifying apparatus: the reducing agent supply means includes an exhaust pipe temperature sensor, a reducing agent injection nozzle, a reducing agent supply pipe, a reducing agent supply pump, a reducing agent storage tank, and a stored reducing agent temperature sensor. A heating wire heating means whose means is connected to an external power supply via a switch and inserted and installed in the reducing agent storage tank;
And / or a heating element connected to an external power supply via a switch and wired over at least a part of or the entire outer surface of a reducing agent supply system including the reducing agent supply pipe, the reducing agent supply pump, and the reducing agent storage tank. An insulating material layer surrounding the heating wire is provided, and when the temperature sensor detects that the temperature of the reducing agent in the reducing agent storage tank has dropped to near its freezing temperature, the heating wire heating element is energized from an external power supply. When the temperature sensor detects that the temperature of the reducing agent is the predetermined upper limit temperature, the power supply is cut off to maintain the temperature of the liquid reducing agent in a temperature range suitable for preventing freezing. The present invention provides the exhaust gas purifying apparatus described above.

【００１２】上記の貯蔵還元剤温度センサの代りに外気
温センサを用い、あるいは上記貯蔵還元剤温度センサと
外気温センサとを併用して還元剤温度制御性を向上する
こともできる。An outside air temperature sensor may be used in place of the above-mentioned storage reductant temperature sensor, or the above-mentioned storage reductant temperature sensor and the outside air temperature sensor may be used in combination to improve the controllability of the reducing agent temperature.

【００１３】本発明の排気ガス浄化装置の一具体例（コ
ンピュータ制御式）を図１の概念図に示す。この具体例
において、エンジン１からの排気ガスは排気管２に設け
られた排気ガス浄化（ＮＯｘ還元）用触媒３、及びマフ
ラ４を通り大気中へ放出される。ＮＯｘ用の液体還元剤
例えば尿素水溶液は還元剤貯蔵タンク７内に仕込まれて
いる。排気ガス中のＮＯｘ濃度の増加が、エンジンの負
荷センサ１４、回転センサ１５及び触媒入口温度センサ
１６からの信号入口によりコンピュー（ＭＰＵ）１３に
より検知されたときには、適時にコンピュータ１３から
の出力信号により還元剤供給ポンプ６を作動させ、液体
還元剤を還元剤貯蔵タンク７から還元剤供給パイプ５を
経て、排気管内にある還元剤供給パイプ先端のノズルか
らＮＯｘ還元用触媒３の上流側に噴射供給する。A specific example (computer control type) of the exhaust gas purifying apparatus of the present invention is shown in the conceptual diagram of FIG. In this specific example, the exhaust gas from the engine 1 is discharged to the atmosphere through an exhaust gas purification (NOx reduction) catalyst 3 provided in an exhaust pipe 2 and a muffler 4. A liquid reducing agent for NOx, for example, an aqueous urea solution is charged in the reducing agent storage tank 7. When an increase in the NOx concentration in the exhaust gas is detected by the computer (MPU) 13 through the signal input from the load sensor 14, the rotation sensor 15, and the catalyst inlet temperature sensor 16 of the engine, the output signal from the computer 13 in a timely manner. The reducing agent supply pump 6 is operated to inject and supply the liquid reducing agent from the reducing agent storage tank 7 through the reducing agent supply pipe 5 to the upstream side of the NOx reduction catalyst 3 from the nozzle at the tip of the reducing agent supply pipe in the exhaust pipe. I do.

【００１４】本発明のこの具体例の装置においては、寒
冷時に凍結し、そのような噴射供給が不能となるおそれ
のある液体還元剤を使用する場合に、その凍結を防止す
るために、還元剤貯蔵タンク７内に電熱線加熱体（ヒー
タ９−１）を挿入設置し、また還元剤貯蔵タンク７から
還元剤供給ポンプ６を経て排気管２まで延在している還
元剤供給パイプ５からなる還元剤供給系の外表面に電熱
線を巻き付け、さらにその上を断熱材層で包囲した加熱
体（ヒータ９−２）を付設し、これらの加熱体（９−１
及び９−２）をバッテリー１２のような外部電源に配線
１０及びスイッチ１１を経て接続してある。液体還元剤
貯蔵タンク７には、タンク内の液体還元剤の温度をモニ
ターするための温度センサ８が取り付けられ、その検出
信号はコンピュータ１３に入力されている。この温度セ
ンサ８からの信号により液体還元剤が凍結しているこ
と、あるいは凍結するおそれがあることがコンピュータ
１３によつて検知されると、コンピュータ１３はスイッ
チ１１を通電に切り替え、ヒータ９−１及び９−２を発
熱させ液体還元剤貯蔵タンク７及び供給管５に存在する
液体還元剤の凍結を防ぎ、円滑な噴射供給が可能な状態
を確保する。また温度センサ８からの信号により、コン
ピュータ１３は液体還元剤の温度が高過ぎる状態となる
前にスイッチ１１を遮断する。還元剤として尿素水溶液
を用いる場合、余り高くなるとＮＨ3を発生することが
あるので、その温度を例えばほぼ０〜５０℃の範囲に制
御するのが適当であろう。明かにそのような制御温度範
囲は、使用する個々の液体還元剤の凍結温度、及び分解
温度等の因子を考慮して適宜に決定されうる。図中の１
８は外気温センサである。In the apparatus according to this embodiment of the present invention, when a liquid reducing agent which freezes in cold weather and which may make such injection supply impossible is used, in order to prevent the freezing, the reducing agent is used. A heating wire heater (heater 9-1) is inserted and installed in the storage tank 7, and is composed of a reducing agent supply pipe 5 extending from the reducing agent storage tank 7 via the reducing agent supply pump 6 to the exhaust pipe 2. A heating wire (heater 9-2) is wound around the outer surface of the reducing agent supply system, and a heating member (heater 9-2) is further surrounded by a heat insulating material layer.
And 9-2) are connected to an external power source such as a battery 12 via a wiring 10 and a switch 11. A temperature sensor 8 for monitoring the temperature of the liquid reducing agent in the tank is attached to the liquid reducing agent storage tank 7, and the detection signal is input to the computer 13. When the computer 13 detects from the signal from the temperature sensor 8 that the liquid reductant is frozen or may be frozen, the computer 13 switches the switch 11 to the energized state, and the heater 9-1. And 9-2 generate heat to prevent the liquid reducing agent present in the liquid reducing agent storage tank 7 and the supply pipe 5 from freezing, and to ensure a state in which smooth injection and supply are possible. Also, the signal from the temperature sensor 8 causes the computer 13 to shut off the switch 11 before the temperature of the liquid reducing agent becomes too high. When an aqueous urea solution is used as the reducing agent, NH 3 may be generated if the temperature is too high. Therefore, it is appropriate to control the temperature in a range of, for example, approximately 0 to 50 ° C. Obviously, such a control temperature range can be appropriately determined in consideration of factors such as the freezing temperature and decomposition temperature of the individual liquid reducing agent used. 1 in the figure
Reference numeral 8 denotes an outside air temperature sensor.

【００１５】液体還元剤貯蔵タンクの外表面には、必要
に応じて、断熱材層１７あるいは電熱線入り断熱材層を
設け、さらに加えて防水層を設けることができる。On the outer surface of the liquid reducing agent storage tank, a heat insulating material layer 17 or a heat insulating material layer containing a heating wire may be provided, if necessary, and further a waterproof layer may be provided.

【００１６】本発明によれば、ＮＯｘ触媒用の好ましい
還元剤として考えられるが凍結のおそれのある液体還元
剤、代表的には尿素水溶液を寒冷条件下でも使用可能と
なす。According to the present invention, a liquid reducing agent which is considered as a preferable reducing agent for the NOx catalyst but has a possibility of freezing, typically, an aqueous urea solution can be used even under cold conditions.

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

【図１】本発明排気ガス浄化装置の概念線図FIG. 1 is a conceptual diagram of an exhaust gas purifying apparatus of the present invention.

【符号の説明】[Explanation of symbols]

１ エンジン ２ 排気管 ３ 排気ガス浄化用（ＮＯｘ）触媒 ４ マフラ ５ 液体還元剤供給パイプ ６ 液体還元剤供給ポンプ ７ 液体還元剤貯蔵タンク ８ 還元剤温度センサ ９−１ ヒータ ９−２ ヒータ １０ 配線（ヒータ用） １１ スイッチ １２ 外部電源（バッテリー） １３ コンピュータ １４ エンジン負荷センサ １５ エンジン回転センサ １６ 排気ガス温度センサ １７ タンク外側断熱材層 １８ 外気温センサ DESCRIPTION OF SYMBOLS 1 Engine 2 Exhaust pipe 3 Exhaust gas purification (NOx) catalyst 4 Muffler 5 Liquid reducing agent supply pipe 6 Liquid reducing agent supply pump 7 Liquid reducing agent storage tank 8 Reducing agent temperature sensor 9-1 Heater 9-2 Heater 10 Wiring ( 11 Switch 12 External power supply (battery) 13 Computer 14 Engine load sensor 15 Engine rotation sensor 16 Exhaust gas temperature sensor 17 Insulation layer outside tank 18 External temperature sensor

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 内燃機関の排気マニホールド、排気管、
マフラからなる排気系内に配置された排気ガス浄化用触
媒の上流側に噴射供給される液体還元剤をその貯蔵タン
ク及びポンプを含む供給管系において凍結から防ぐ保温
装置であって：該液体還元剤貯蔵タンク及びポンプを含
む供給管系の外表面の全体ないし主要部分にわたって電
熱線を配置し、その上に断熱材の包囲層を設け、さらに
必要に応じて貯蔵タンク内にも電熱線加熱手段を設け、
液体還元剤温度及び／または外気温に応じてそれらの電
熱線に外部電源から通電し、そしてその通電を遮断し、
液体還元剤の温度を凍結を防止するのに適切な温度範囲
に維持する構成としたことを特徴とする上記保温装置。An exhaust manifold for an internal combustion engine, an exhaust pipe,
A heat retention apparatus for preventing a liquid reducing agent injected and supplied to an upstream side of an exhaust gas purifying catalyst disposed in an exhaust system including a muffler from being frozen in a supply pipe system including a storage tank and a pump thereof: A heating wire is arranged over the entire or main part of the outer surface of the supply pipe system including the agent storage tank and the pump, and a surrounding layer of heat insulating material is provided thereon, and if necessary, the heating wire heating means is also provided in the storage tank. Is established,
Energizing those heating wires from an external power source according to the liquid reductant temperature and / or the outside temperature, and cutting off the energization,
The above-mentioned heat retention device, wherein the temperature of the liquid reducing agent is maintained in a temperature range suitable for preventing freezing. 【請求項２】 還元剤貯蔵タンク内にも電熱線加熱体を
挿入設置して貯蔵タンク内の還元剤を外部電源からの適
宜な通電及びその遮断により保温できるようにしてある
請求項１の保温装置。2. A heat retention device according to claim 1, wherein a heating wire is also inserted into the reducing agent storage tank so that the reducing agent in the storage tank can be kept warm by an appropriate power supply from an external power supply and cutoff thereof. apparatus. 【請求項３】 液体還元剤が尿素水溶液またはアンモニ
ア水溶液である請求項１または２の保温装置。3. The heat retention device according to claim 1, wherein the liquid reducing agent is an aqueous urea solution or an aqueous ammonia solution. 【請求項４】 内燃機関の排気マニホールド、排気管、
マフラからなる排気系内に排気ガス浄化用触媒とその触
媒の上流側において液体還元剤を噴射供給する還元剤供
給手段を備えた排気ガス浄化装置において：該還元剤供
給手段が排気管内温度センサ、還元剤噴射ノズル、還元
剤供給パイプ、還元剤供給ポンプ、還元剤貯蔵タンク、
貯蔵還元剤温度センサを備え、 さらにその還元剤供給手段が外部電源にスイッチを介し
て接続され還元剤貯蔵タンク内に挿入設置された電熱線
加熱体、及び／または外部電源にスイッチを介して接続
され上記還元剤供給パイプ、還元剤供給ポンプ及び還元
剤貯蔵タンクからなる還元剤供給系の外表面の少なくと
も一部分ないし全体にわたって配線された電熱線加熱体
及びその上を包囲した断熱材層を備え、 還元剤貯蔵タンク内の還元剤温度がその凍結温度付近に
まで降下したことが温度センサで検出されたときに前記
電熱線加熱体に外部電源から通電し、そして還元剤温度
が所定の上限温度であることが温度センサで検出された
ときにその通電を遮断することにより、液体還元剤の温
度を凍結を防止するのに適切な温度範囲に維持すること
を特徴とする上記排気ガス浄化装置。4. An exhaust manifold for an internal combustion engine, an exhaust pipe,
In an exhaust gas purifying apparatus provided with an exhaust gas purifying catalyst and a reducing agent supply means for injecting and supplying a liquid reducing agent upstream of the catalyst in an exhaust system comprising a muffler: the reducing agent supply means is an exhaust pipe temperature sensor; Reducing agent injection nozzle, reducing agent supply pipe, reducing agent supply pump, reducing agent storage tank,
A storage reductant temperature sensor is provided, and the reductant supply means is connected to an external power source via a switch, and is connected to the external power source via a switch, and / or a heating wire inserted and installed in the reductant storage tank. A heating wire wired over at least a part or the entire outer surface of the reducing agent supply system including the reducing agent supply pipe, the reducing agent supply pump and the reducing agent storage tank, and a heat insulating material layer surrounding the heating element. When the temperature sensor detects that the temperature of the reducing agent in the reducing agent storage tank has dropped to around its freezing temperature, the heating wire is energized from an external power supply, and the reducing agent temperature is reduced to a predetermined upper limit temperature. Maintaining the temperature of the liquid reductant in an appropriate temperature range to prevent freezing by shutting off the current when the temperature sensor detects that there is something The exhaust gas purifying apparatus according to claim. 【請求項５】 還元剤の温度制御性の向上のために上記
貯蔵還元剤温度センサの代りに、またはそれに加えて外
気温センサを使用することを特徴とする請求項４の排気
ガス浄化装置。5. The exhaust gas purifying apparatus according to claim 4, wherein an outside air temperature sensor is used instead of or in addition to said storage reducing agent temperature sensor for improving the temperature controllability of the reducing agent.
JP10197181A 1998-07-13 1998-07-13 Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device Pending JP2000027627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10197181A JP2000027627A (en) 1998-07-13 1998-07-13 Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10197181A JP2000027627A (en) 1998-07-13 1998-07-13 Reducing agent thermal insulating device for exhaust gas cleaning catalyst, and exhaust emission control device provided with this thermal insulating device

Publications (1)

Publication Number Publication Date
JP2000027627A true JP2000027627A (en) 2000-01-25

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Application Number Title Priority Date Filing Date
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