JPH0286914A - Exhaust gas purification device for hydrogen fueled engine - Google Patents
Exhaust gas purification device for hydrogen fueled engineInfo
- Publication number
- JPH0286914A JPH0286914A JP23785888A JP23785888A JPH0286914A JP H0286914 A JPH0286914 A JP H0286914A JP 23785888 A JP23785888 A JP 23785888A JP 23785888 A JP23785888 A JP 23785888A JP H0286914 A JPH0286914 A JP H0286914A
- Authority
- JP
- Japan
- Prior art keywords
- ammonia
- exhaust gas
- hydrogen
- nitrogen
- amount
- 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
Links
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
- F01N3/18—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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野］
この発明は水素エンジンの排ガス浄化装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an exhaust gas purification device for a hydrogen engine.
［従来技術及び課題］
水素エンジンの排ガス浄化装置として、排気管の途中に
触媒コンバータを設は酸化雰囲気中（空燃比が大きく酸
素が多く残っている状態〉で排気ガス中の窒素酸化物（
ＮＯｘ ＞を還元することが考えられているが、窒素酸
化物（ＮＯＸ ）の除去効率が悪かった。[Prior art and issues] As an exhaust gas purification device for a hydrogen engine, a catalytic converter is installed in the middle of the exhaust pipe to remove nitrogen oxides (
Although it has been considered to reduce nitrogen oxides (NOx), the removal efficiency of nitrogen oxides (NOx) was poor.
この発明の目的は、排気ガス中の窒素酸化物（ＮＯＸ
）の除去効率がよい水素エンジンの排ガス浄化装置を提
供することにある。The purpose of this invention is to eliminate nitrogen oxides (NOX) in exhaust gas.
) An object of the present invention is to provide an exhaust gas purification device for a hydrogen engine that has high removal efficiency.
「課題を解決するための手段］
この発明は、水素を貯蔵する水素貯蔵手段からの水素を
燃料として駆動する水素エンジンにおいて、前記水素貯
蔵手段の水素と窒素供給源からの窒素とからアンモニア
を合成するアンモニア合成手段と、前記水素エンジンの
排気ガス中の窒素酸化物の量を検出する窒素酸化物検出
手段と、前記窒素酸化物検出手段による排気ガス中の窒
素酸化物の量に応じて排気ガスに前記アンモニア合成手
段によるアンモニアを所定量混合させるアンモニア混合
手段と、前記アンモニア混合手段により混合されたアン
モニアにより排気ガス中の窒素酸化物を還元させる還元
手段とを備えた水素エンジンの排ガス浄化装置をその要
旨とするものでめる。"Means for Solving the Problems" The present invention provides a method for synthesizing ammonia from hydrogen in the hydrogen storage means and nitrogen from a nitrogen supply source in a hydrogen engine that is driven using hydrogen from a hydrogen storage means for storing hydrogen as fuel. ammonia synthesis means for detecting the amount of nitrogen oxides in the exhaust gas of the hydrogen engine; and nitrogen oxides detection means for detecting the amount of nitrogen oxides in the exhaust gas of the hydrogen engine; An exhaust gas purification device for a hydrogen engine, comprising an ammonia mixing means for mixing a predetermined amount of ammonia by the ammonia synthesis means, and a reducing means for reducing nitrogen oxides in exhaust gas with the ammonia mixed by the ammonia mixing means. Include the gist of the article.
［作用］
アンモニア合成手段にて水素貯蔵手段の水素と窒素供給
源からの窒素とからアンモニアが合成され、窒素酸化物
検出手段による排気ガス中の窒素酸化物の母に応じて、
アンモニア混合手段により排気ガスに前記アンモニア合
成手段によるアンモニアが所定量混合され、還元手段に
てその混合されたアンモニアにより排気ガス中の窒素酸
化物が還元される。[Operation] Ammonia is synthesized by the ammonia synthesis means from hydrogen in the hydrogen storage means and nitrogen from the nitrogen supply source, and according to the nitrogen oxide concentration in the exhaust gas by the nitrogen oxide detection means,
The ammonia mixing means mixes a predetermined amount of ammonia produced by the ammonia synthesis means into the exhaust gas, and the reducing means reduces nitrogen oxides in the exhaust gas with the mixed ammonia.
その結果、水素エンジンの排気ガス中の窒素酸化物の量
が低下する。As a result, the amount of nitrogen oxides in the hydrogen engine exhaust gas is reduced.
［実施例］
以下、この発明を具体化した一実施例を図面に従って説
明する。[Example] An example embodying the present invention will be described below with reference to the drawings.
図に示すように、水素貯蔵手段としてのＭＨタンク１に
は水素を水素吸蔵合金の化合物として貯蔵した金属水素
化物（Ｍ ｌ−１）が内蔵され、加熱することにより水
素ガスを発生させることができるようになっている。水
素エンジン２は前記ＭＨタンク１から供給される水素に
て駆動して、窒素酸化物（ＮＯｘ）を含んだガス（排気
ガス）を排出する。As shown in the figure, the MH tank 1 as a hydrogen storage means contains a metal hydride (Ml-1) that stores hydrogen as a hydrogen storage alloy compound, and can generate hydrogen gas by heating. It is now possible to do so. The hydrogen engine 2 is driven by hydrogen supplied from the MH tank 1 and discharges gas (exhaust gas) containing nitrogen oxides (NOx).
排気管３にはその外周部を覆うようにアンモニア合成手
段としてのアンモニア合成触媒４が配設され、本実施例
ではこの触媒４にはＦｅ３Ｏ４／１２０３．０．６〜２
％／に２０．０．３〜１゜５％を使用している。このア
ンモニア合成触媒４には流量調整弁５を介して窒素供給
源６から窒素が供給される。本実施例ではこの窒素供給
源６として窒素ボンベを使用している。又、アンモニア
合成触媒４には流量調整弁７を介して前記ＭＨタンク１
が接続され、このＭＨタンク１から水素が供給されるよ
うになっている。An ammonia synthesis catalyst 4 as an ammonia synthesis means is disposed in the exhaust pipe 3 so as to cover its outer circumference, and in this embodiment, this catalyst 4 contains Fe3O4/1203.0.6~2.
20.0.3~1°5% is used for %/. Nitrogen is supplied to the ammonia synthesis catalyst 4 from a nitrogen supply source 6 via a flow rate regulating valve 5 . In this embodiment, a nitrogen cylinder is used as the nitrogen supply source 6. Further, the ammonia synthesis catalyst 4 is connected to the MH tank 1 via a flow rate regulating valve 7.
is connected, and hydrogen is supplied from this MH tank 1.
そして、同アンモニア合成触媒４内で窒素供給源６から
の窒素とＭＨタンク１からの水素とによりアンモニアが
合成される（Ｎ２ ＋３ Ｈ２→２ ＮＨ３）。Then, ammonia is synthesized in the ammonia synthesis catalyst 4 using nitrogen from the nitrogen supply source 6 and hydrogen from the MH tank 1 (N2 + 3 H2 → 2 NH3).
このとき、アンモニア合成触媒４は触媒層が排気管３の
回りに取付けられ、排気ガスの熱にて２００℃程度にな
り触媒が活性化される。At this time, a catalyst layer of the ammonia synthesis catalyst 4 is attached around the exhaust pipe 3, and the temperature becomes about 200° C. due to the heat of the exhaust gas, and the catalyst is activated.
さらに、前記アンモニア合成触媒４で合成されたアンモ
ニアは流量調整弁８を介して排気管３内に供給され、排
気ガスと混合される。Further, the ammonia synthesized by the ammonia synthesis catalyst 4 is supplied into the exhaust pipe 3 via the flow rate regulating valve 8 and mixed with the exhaust gas.
排気管３には前記アンモニア合成触媒４より下流に還元
手段としての還元反応用触媒９が配置され、この触媒９
は排気ガス中の窒素酸化物（Ｎ。A reduction reaction catalyst 9 as a reduction means is disposed downstream of the ammonia synthesis catalyst 4 in the exhaust pipe 3.
is nitrogen oxide (N.) in exhaust gas.
×）をアンモニアで還元させる。即ち、次のような還元
反応が起こる。×) is reduced with ammonia. That is, the following reduction reaction occurs.
６ＮＯｘ＋４ＮＨ３→５Ｎ２ ＋６Ｈ２０このとき、還
元反応用触媒９には、Ｖ２Ｏ５／Ｔ！０２が使用され、
反応温度は３００’Ｃに設定されるようになっている。6NOx+4NH3→5N2 +6H20 At this time, the reduction reaction catalyst 9 contains V2O5/T! 02 is used,
The reaction temperature is set at 300'C.
又、前記水素エンジン２の出口付近の排気管３には窒素
酸化物検出手段としてのＮＯｘセンサ１０が取付けられ
、同センサー０にて水素エンジン２の排気ガス中の窒素
酸化物の量（ｌ［）が検出される。このＮＯｘセン−リ
−１０には表面制御型半導体センサが使用される。Further, a NOx sensor 10 as a nitrogen oxide detection means is attached to the exhaust pipe 3 near the outlet of the hydrogen engine 2, and the NOx sensor 10 detects the amount of nitrogen oxides (l[ ) is detected. This NOx sensor 10 uses a surface control type semiconductor sensor.
アンモニア混合手段としてのコンピューター１は、前記
ＮＯＸセンサー０からの信号を入力して、排気ガス中の
窒素酸化物の量（濃度）を検知する。A computer 1 serving as an ammonia mixing means receives the signal from the NOX sensor 0 and detects the amount (concentration) of nitrogen oxides in the exhaust gas.
又、コンピューター１は流量調整弁５．７．８を駆動し
その弁開度を調整して窒素のアンモニア合成触媒４への
供給量、ＭＨタンク１からアンモニア合成触媒４への水
素の供給量、及びアンモニア合成触媒４からのアンモニ
アの排気ガスへの混合量を制御する。Further, the computer 1 drives the flow rate regulating valve 5.7.8 and adjusts its opening degree to control the amount of nitrogen supplied to the ammonia synthesis catalyst 4, the amount of hydrogen supplied from the MH tank 1 to the ammonia synthesis catalyst 4, And the amount of ammonia mixed into the exhaust gas from the ammonia synthesis catalyst 4 is controlled.
次に、このように構成した水素エンジンの排ガス浄化装
置の作用を説明する。Next, the operation of the hydrogen engine exhaust gas purification device configured as described above will be explained.
水素エンジン２はＭＨタンク１からの水素を燃料として
駆動して窒素酸化物（ＮＯｘ ）を含んだ排気ガスを放
出する。その排気ガスは排気管３に設ＣプられたＮＯｘ
センサー０にてそのＮＯＸの量（濃度〉が検出され、コ
ンピュータ１１はそのセンサ１０によりＮＯＸの１（Ｉ
ｆｉ度）を検知する。The hydrogen engine 2 is driven using hydrogen from the MH tank 1 as fuel and emits exhaust gas containing nitrogen oxides (NOx). The exhaust gas is NOx installed in the exhaust pipe 3.
The amount (concentration) of NOX is detected by the sensor 0, and the computer 11 detects 1 (I) of NOX by the sensor 10.
degree).
コンピュータ１１は排気ガス中の窒素酸化物のＭ（濃度
）に応じて、アンモニア合成触媒４への窒素の供給量と
水素の供給量を決定する。そして、コンピュータ１１は
流量制御弁５を制御して所定定量の水素をアンモニア合
成触媒４に供給する。The computer 11 determines the amount of nitrogen and hydrogen to be supplied to the ammonia synthesis catalyst 4 according to M (concentration) of nitrogen oxides in the exhaust gas. Then, the computer 11 controls the flow rate control valve 5 to supply a predetermined amount of hydrogen to the ammonia synthesis catalyst 4.
アンモニア合成触媒４においては、窒素とＭＨタンク１
からの水素とにより排気ガスの窒素酸化物の量に応じて
アンモニアが合成される。ざらに、コンピュータ１１は
流量調整弁８を制御してアンモニア合成触媒４から所定
量のアンモニアを排気ガスに供給させ、両者を混合する
。In the ammonia synthesis catalyst 4, nitrogen and MH tank 1
Ammonia is synthesized depending on the amount of nitrogen oxides in the exhaust gas. Roughly speaking, the computer 11 controls the flow rate regulating valve 8 to supply a predetermined amount of ammonia from the ammonia synthesis catalyst 4 to the exhaust gas, and mix the two.
還元反応用触媒９においては、アンモニア合成触媒４か
らのアンモニアにて排気ガス中の窒素酸化物が還元され
る。In the reduction reaction catalyst 9, nitrogen oxides in the exhaust gas are reduced with ammonia from the ammonia synthesis catalyst 4.
このように本実施例においては、水素をアンモア合成原
料とし、そのアンモニアにて水素エンジン２の排気ガス
中の窒素酸化物を還元することにより還元雰囲気下で窒
素酸化物を還元でき窒素酸化物の路（濃度）を確実に低
減することができる。このとき、燃料である水素の一部
をアンモア合成原料としているので、水素発生装置又は
アンモニアボンベを設置する必要がなく、アンモニア合
成触媒４を設置するだ（プでよい。As described above, in this embodiment, hydrogen is used as the raw material for ammonia synthesis, and by using the ammonia to reduce nitrogen oxides in the exhaust gas of the hydrogen engine 2, nitrogen oxides can be reduced in a reducing atmosphere. (concentration) can be reliably reduced. At this time, since part of the hydrogen that is the fuel is used as the raw material for ammonia synthesis, there is no need to install a hydrogen generator or an ammonia cylinder, and it is sufficient to install an ammonia synthesis catalyst 4.
又、アンモニアは人体に有害であるが、ＮＯＸセンセン
０よりＮＯｘの量（ｍ度）を検出してコンピュータ１１
により適量のアンモニアを合成することができる。さら
に、アンモニア合成触媒４を活性状態にするためにその
触媒４を排気管３の回りに取付けているので、その排気
熱を有効に利用することができる。In addition, although ammonia is harmful to the human body, the computer 11 detects the amount of NOx (m degrees) from NOx sensor 0.
An appropriate amount of ammonia can be synthesized by this method. Furthermore, since the ammonia synthesis catalyst 4 is attached around the exhaust pipe 3 in order to activate it, the exhaust heat can be effectively utilized.
尚、この発明は上記実施例に限定されるものではなく、
上記実施例ではＮＯＸセンサ１０によりＮＯＸ！（濃度
）を検知し、水素と窒素を適量反応させてアンモニアを
合成するようにしたが、アンモニアタンクを別途用意し
、適宜のタイミングで水素と窒素の反応によるアンモニ
アを合成しそのアンモニアをアンモニアタンクに貯蔵し
、アンモニアタンクから必要量のアンモニアを排気管内
の排気ガスと混合してもよい。Note that this invention is not limited to the above embodiments,
In the above embodiment, the NOX sensor 10 detects NOX! (concentration) and reacted an appropriate amount of hydrogen and nitrogen to synthesize ammonia.However, an ammonia tank was prepared separately, ammonia was synthesized by the reaction of hydrogen and nitrogen at an appropriate timing, and the ammonia was transferred to the ammonia tank. The required amount of ammonia from the ammonia tank may be mixed with the exhaust gas in the exhaust pipe.
［発明の効果］
以上詳述したようにこの発明によれば、排出ガス中の窒
素酸化物（ＮＯＸ ）の除去効率がよいものにできる優
れた効果を発揮する。[Effects of the Invention] As described in detail above, the present invention exhibits an excellent effect of improving the efficiency of removing nitrogen oxides (NOX) from exhaust gas.
図はこの発明を具体化した水素エンジンの排ガス浄化装
置を示す図。
１は水素貯蔵手段としてのＭＨタンク、２は水素エンジ
ン、４はアンモニア合成手段としてのアンモニア合成触
媒、６は窒素供給源、９は還元手段としての還元反応用
触媒、１０は窒素酸化物検出手段としてのＮＯＸセンサ
、１１はアンモニア混合手段としてのコンピュータ。
特許出願人 株式会社 豊田自動織機製作所新日本
製鐵 株式会社The figure shows an exhaust gas purification device for a hydrogen engine embodying the present invention. 1 is an MH tank as a hydrogen storage means, 2 is a hydrogen engine, 4 is an ammonia synthesis catalyst as an ammonia synthesis means, 6 is a nitrogen supply source, 9 is a reduction reaction catalyst as a reduction means, 10 is a nitrogen oxide detection means 11 is a computer as an ammonia mixing means. Patent applicant Toyota Industries Corporation Nippon Steel Corporation
Claims (1)
て駆動する水素エンジンにおいて、 前記水素貯蔵手段の水素と窒素供給源からの窒素とから
アンモニアを合成するアンモニア合成手段と、 前記水素エンジンの排気ガス中の窒素酸化物の量を検出
する窒素酸化物検出手段と、 前記窒素酸化物検出手段による排気ガス中の窒素酸化物
の量に応じて排気ガスに前記アンモニア合成手段による
アンモニアを所定量混合させるアンモニア混合手段と、 前記アンモニア混合手段により混合されたアンモニアに
より排気ガス中の窒素酸化物を還元させる還元手段と を備えた水素エンジンの排ガス浄化装置。[Scope of Claims] 1. In a hydrogen engine driven by using hydrogen from a hydrogen storage means for storing hydrogen as fuel, an ammonia synthesis means for synthesizing ammonia from hydrogen in the hydrogen storage means and nitrogen from a nitrogen supply source; , a nitrogen oxide detection means for detecting the amount of nitrogen oxide in the exhaust gas of the hydrogen engine, and the ammonia synthesis means in the exhaust gas according to the amount of nitrogen oxide in the exhaust gas detected by the nitrogen oxide detection means. An exhaust gas purification device for a hydrogen engine, comprising: an ammonia mixing means for mixing a predetermined amount of ammonia; and a reducing means for reducing nitrogen oxides in exhaust gas with the ammonia mixed by the ammonia mixing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23785888A JPH0286914A (en) | 1988-09-22 | 1988-09-22 | Exhaust gas purification device for hydrogen fueled engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23785888A JPH0286914A (en) | 1988-09-22 | 1988-09-22 | Exhaust gas purification device for hydrogen fueled engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0286914A true JPH0286914A (en) | 1990-03-27 |
Family
ID=17021457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23785888A Pending JPH0286914A (en) | 1988-09-22 | 1988-09-22 | Exhaust gas purification device for hydrogen fueled engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0286914A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852057A1 (en) * | 2003-03-06 | 2004-09-10 | Bosch Gmbh Robert | Vehicle fitted with device that treats exhaust gas with ammonia, used to reduce nitrogen oxides to water and nitrogen, where the ammonia is generated from hydrogen and nitrogen |
| WO2004099076A3 (en) * | 2003-05-05 | 2005-05-12 | Eaton Corp | Methods and apparatus for small-scale synthesis of ammonia |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01280617A (en) * | 1987-07-15 | 1989-11-10 | Shinnenshiyou Syst Kenkyusho:Kk | Processing system of nitrogen oxides in exhaust emission of engine |
-
1988
- 1988-09-22 JP JP23785888A patent/JPH0286914A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01280617A (en) * | 1987-07-15 | 1989-11-10 | Shinnenshiyou Syst Kenkyusho:Kk | Processing system of nitrogen oxides in exhaust emission of engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852057A1 (en) * | 2003-03-06 | 2004-09-10 | Bosch Gmbh Robert | Vehicle fitted with device that treats exhaust gas with ammonia, used to reduce nitrogen oxides to water and nitrogen, where the ammonia is generated from hydrogen and nitrogen |
| WO2004099076A3 (en) * | 2003-05-05 | 2005-05-12 | Eaton Corp | Methods and apparatus for small-scale synthesis of ammonia |
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