JPH0440056B2 - - Google Patents
Info
- Publication number
- JPH0440056B2 JPH0440056B2 JP58240055A JP24005583A JPH0440056B2 JP H0440056 B2 JPH0440056 B2 JP H0440056B2 JP 58240055 A JP58240055 A JP 58240055A JP 24005583 A JP24005583 A JP 24005583A JP H0440056 B2 JPH0440056 B2 JP H0440056B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- injection
- gas
- injection pipe
- pipe
- 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.)
- Expired - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 57
- 239000007924 injection Substances 0.000 claims description 57
- 239000007789 gas Substances 0.000 claims description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 description 16
- 238000009826 distribution Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】
（発明の利用分野）
本発明はアンモニア注入装置に係り、特に排ガ
ス中のダストが注入ノズルへ付着するのを防止
し、アンモニアを効果的に分配せしめるアンモニ
ア注入装置に関するものである。Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to an ammonia injection device, and particularly to an ammonia injection device that prevents dust in exhaust gas from adhering to an injection nozzle and effectively distributes ammonia. It is.
（発明の背景）
アンモニア（以下、NH3と記すことがある）
による接触還元法乾式脱硝装置においては、通
常、NH3を注入する部分でのダクト内のNOX量
分布は一様でなく、水平方向ないし垂直方向にそ
れぞれNOX量分布が存在する。そこでこのNOX
分布に対応するため、従来から種々の形式の
NH3注入装置が考案されている。以下、その１
例として第１図に示すようなNH3注入装置の場
合について説明する。第１図において、注入管は
矢印に示すガス流方向に垂直に複数本設けられ、
各注入管５にはガス流と平行にノズル６が複数個
設けられている。なお、図中、９は流量測定用の
オリフイスである。このような装置において、ダ
クト１の水平方向のNOX分布に対しては、注入
管５の元部に設けられたバルブ３を調整すること
により、その分布に応じたNH3の注入が可能で
ある。一方、注入管５の長手方向（ダタト垂直方
向）のNOX分布に対しては、ノズル先端のオリ
フイス４の孔径を調整して、その分布に応じた
NH3を注入している。(Background of the invention) Ammonia (hereinafter sometimes referred to as NH3 )
In the catalytic reduction method dry denitrification equipment, the NO X amount distribution in the duct is usually not uniform at the part where NH 3 is injected, and there are NO X amount distributions in the horizontal and vertical directions. So this NO X
In order to correspond to the distribution, various types of
An NH 3 injection device has been devised. Below, Part 1
As an example, the case of an NH 3 injection device as shown in FIG. 1 will be explained. In FIG. 1, a plurality of injection pipes are provided perpendicularly to the gas flow direction shown by the arrow,
Each injection pipe 5 is provided with a plurality of nozzles 6 in parallel with the gas flow. In addition, in the figure, 9 is an orifice for measuring the flow rate. In such a device, it is possible to inject NH 3 according to the horizontal distribution of NO X in the duct 1 by adjusting the valve 3 provided at the base of the injection pipe 5. be. On the other hand, for the NO
Injecting NH3 .
このように従来から提案されているNH3注入
装置は全てダクト内のNOX量分布に見合うNH3
量を注入調整するものであるが、これらの装置で
使用されている１本の注入管５はどの種の注入装
置においても基本的には同一のものである。この
１本の注入管５からのNH3噴出をフローパター
ン・モデル・テストで再現してみると、第２図に
示すようにノズル６から噴出されるNH3ガスの
方向８は、注入管５の元部に近いほどノズルの方
向からずれ、ある傾きをもつてしまうことが確認
された。なお、図中、１２はノズルキヤツプであ
る。これは、注入管の元部に近いほど管内流速が
速く、注入管５からノズル６へ分岐する際、ノズ
ルの一端の壁にぶつかり、そのはねかえりで噴出
部へ向つて噴出されるためであると考えられる。
このことは、実機での注入管の点検結果からも実
証され、例えばノズルへのダスト付着状況はガス
の噴出方向と同じように傾きをもつてノズルから
先へと成長していることがわかつた。このような
ことから、１本の注入管に配列された複数のノズ
ルからNH3を均一に注入することは困難であり、
NOX分布に応じたNH3注入を精度良く行なう装
置が望まれていた。 In this way, all of the NH 3 injection devices that have been proposed so far are capable of producing NH 3 that matches the NOx amount distribution within the duct.
Although the amount of injection is adjusted, the single injection tube 5 used in these devices is basically the same regardless of the type of injection device. When this NH 3 ejection from one injection pipe 5 is reproduced by a flow pattern model test, the direction 8 of the NH 3 gas ejected from the nozzle 6 is as shown in FIG. It was confirmed that the closer to the base of the nozzle, the more it deviates from the direction of the nozzle and has a certain inclination. In addition, in the figure, 12 is a nozzle cap. This is because the flow velocity inside the tube is faster as it is closer to the base of the injection tube, and when it branches from the injection tube 5 to the nozzle 6, it hits the wall at one end of the nozzle, and the rebound causes it to be ejected toward the spouting part. Conceivable.
This was also verified by inspection results of injection pipes in actual equipment, and for example, it was found that dust adhesion to the nozzle grew from the nozzle forward with an inclination similar to the direction of gas ejection. . For this reason, it is difficult to uniformly inject NH 3 from multiple nozzles arranged in one injection pipe.
There was a desire for a device that could accurately perform NH 3 injection according to the NO X distribution.
一方、ダスト濃度の高い石炭焚や高硫黄濃度の
重油焚の燃焼排ガス、いわゆるダーテイーガスを
処理する脱硝装置のNH3注入装置においては、
上記に加え、第３図に示すように注入管５によつ
て排ガスに乱れが生じその乱れによつてダストが
注入管５の方へ巻き込まれ、ダストの付着堆積を
生ずる。また、注入ノズル６から吹き出すNH3
をも巻き込み、このNH3が排ガス中のSO3と反応
し、酸性硫安を生成し、堆積ダストを固化、成長
させることになる。このこととガス乱れによる噴
出部での渦の発生により、ダストがより堆積しや
すくなる。その結果、第４図に示すようにダスト
が堆積成長し、堆積したダスト１０が一つのノズ
ル状になり、NH3の噴出方向を変えてしまう結
果となり、均一なNH3の分配は困難となつてく
るという問題があつた。 On the other hand, in the NH 3 injection device of the denitrification equipment that processes combustion exhaust gas from coal-fired combustion with high dust concentration and heavy oil-fired combustion with high sulfur concentration, so-called dirty gas,
In addition to the above, as shown in FIG. 3, the exhaust gas is disturbed by the injection pipe 5, and the disturbance causes dust to be drawn in toward the injection pipe 5, resulting in the accumulation of dust. In addition, NH 3 blown out from the injection nozzle 6
This NH 3 reacts with SO 3 in the exhaust gas, producing acidic ammonium sulfate, which solidifies and grows the deposited dust. This and the generation of vortices at the ejection part due to gas turbulence make it easier for dust to accumulate. As a result, as shown in Fig. 4, the dust accumulates and grows, and the accumulated dust 10 forms a nozzle shape, changing the direction of NH 3 ejection, making it difficult to uniformly distribute NH 3 . I had a problem with it coming.
（発明の目的）
本発明の目的は、前述した従来技術の欠点をな
くし、ダクト内の上下左右のNOX量の分布に応
じ適正なNH3注入を、長期に安定に維持できる
ようにしたNH3注入装置を提供することにある。(Object of the Invention) The object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide an NH 3.Providing injection equipment.
（発明の概要）
本発明は、排煙脱硝装置で還元剤としてアンモ
ニアを注入するために、ガス流れと並行に数個の
注入ノズルが設置されている注入管をダクト内に
配置したアンモニア注入装置において、前記注入
管に設置されているノズルの長さを該注入管によ
つて生じる被処理ガスの滞留部よりも先方に延長
し、該ノズル先端部を先細としたことを特徴とす
る。(Summary of the Invention) The present invention provides an ammonia injection device in which an injection pipe in which several injection nozzles are installed in parallel with the gas flow is arranged in a duct in order to inject ammonia as a reducing agent in a flue gas denitrification device. In this method, the length of the nozzle installed in the injection pipe is extended beyond the retention area of the gas to be treated generated by the injection pipe, and the tip of the nozzle is tapered.
本発明においては、前記ノズルの長さを、注入
管径の２〜３倍（特に2.3倍前後）以上にするこ
とが好ましい。 In the present invention, it is preferable that the length of the nozzle is at least 2 to 3 times (especially around 2.3 times) the diameter of the injection tube.
本発明によれば、ノズルの長さを前記所定の長
さとすることにより、NH3噴出部を注入管によ
つて生じる乱れが回復する部分に置くことがで
き、しかもその先端部を先細としたことにより、
ノズルへのダストの付着を防止し、NH3の噴出
方向を正しく整えることができる。 According to the present invention, by setting the length of the nozzle to the predetermined length, the NH 3 jetting part can be placed in a part where the turbulence caused by the injection pipe is recovered, and the tip part is tapered. By this,
This prevents dust from adhering to the nozzle and allows the correct direction of NH 3 ejection.
（発明の実施例）
第３図に示したように、ガス流れは、注入管５
により乱れ、注入管５の後ろ側にガスの滞留部を
生じる。これをモデルテストにて再現してみたと
ころ、注入管５により乱された流れは、注入管５
を通過した後、注入管中心から注入管径の２〜３
倍以上の位置で回復することが確認された。ま
た、種々の実験で、乱された流れが回復していく
角度θが約12°であることもわかつた。これらの
ことから、第５図（キヤツプ付きノズルの場合）
に示すように、流れの回復する位置以上、つま
り、ノズル６の長さを注入管中心から注入管径Ｄ
の２〜３倍（望ましくは2.3倍）以上の長さにす
れば、噴出されたNH3はガス流れに乗り、後流
の触媒層へと均一に流れ、その結果、酸性硫安の
生成によるダストの固化成長が防止され、噴出部
に付着し、閉塞させることもなくなることがわか
つた。(Embodiment of the invention) As shown in FIG.
This causes turbulence and causes a gas stagnation part on the back side of the injection pipe 5. When we reproduced this in a model test, we found that the flow disturbed by the injection pipe 5 was
After passing through, 2 to 3 of the diameter of the injection pipe from the center of the injection pipe.
It was confirmed that recovery occurred at more than twice the position. In addition, various experiments have revealed that the angle θ at which the disturbed flow recovers is approximately 12°. From these facts, Fig. 5 (in the case of a nozzle with a cap)
As shown in FIG.
If the length is 2 to 3 times (preferably 2.3 times) or more than It was found that the solidification and growth of the liquid was prevented, and that it did not adhere to the ejection part and cause it to become clogged.
なお、キヤツプ１２の位置を先端におくと、第
６図のように、キヤツプ１２の先端で渦を発生さ
せ、ガス滞留部を生じることになるため、第５図
に示すようにキヤツプ１２の先に直管を設け、該
キヤツプ１２までの位置はノズル長さの半分以下
の位置とすると好ましいことがわかつた。なお、
キヤツプ無しの短管のみのノズル型式の場合も注
入管中心から注入管径の２〜３倍の長さとするこ
とが好ましい。 If the cap 12 is placed at the tip, as shown in FIG. 6, a vortex will be generated at the tip of the cap 12, creating a gas retention area. It has been found that it is preferable to provide a straight pipe in the nozzle and to set the position up to the cap 12 at a position less than half the length of the nozzle. In addition,
Even in the case of a nozzle type with only a short tube without a cap, the length from the center of the injection tube is preferably 2 to 3 times the diameter of the injection tube.
なお、この長くしたノズル（直管）７が肉厚で
ある場合、先端では、第８図に示すように、ノズ
ル（直管）７の厚みにより渦が発生し、ノズル部
先端に第９図のようにダスト１０が付着成長して
行く恐れがある。そこで、第１０図に示すよう
に、ノズル（直管）７の先を細くし、渦流を発生
させないようにすれば、より一層の効果が得られ
る。なお、ノズルを先細にする際の角度θ2（第１
０図）は特に規定する訳ではないが、一般に言わ
れている流体のはく離が発生し始める角度θ2＝
2.5°と、先に述べた乱された流れが回復する角度
に沿つたθ2＝12°との両者を考え、2°〜12°の角度
をつけることが好ましい。 If the elongated nozzle (straight pipe) 7 has a thick wall, a vortex will be generated at the tip due to the thickness of the nozzle (straight pipe) 7, as shown in FIG. There is a possibility that the dust 10 will adhere and grow as shown in FIG. Therefore, as shown in FIG. 10, if the tip of the nozzle (straight pipe) 7 is tapered to prevent the generation of eddy currents, even more effects can be obtained. Note that the angle θ 2 (first
0) is not specifically defined, but it is generally said that the angle at which fluid separation begins to occur θ 2 =
Considering both 2.5° and θ 2 =12° along the angle at which the disturbed flow recovers as described above, it is preferable to set the angle between 2° and 12°.
このように、ノズルの長さを被処理ガスの滞留
部よりも先方に延長したことにより、NH3注入
を排ガスの整流位置で行うことができる他、もう
一つの欠点であつたNH3噴出の方向性も、第７
図に示すようにノズルの壁にぶつかつた流れは、
ノズル管内で整流されて平行流に近くなり、この
ガス流れに沿つてNH3を平行に噴出させること
ができる。また、ノズルの先端部を先細にしたこ
とにより、ダスト付着によるNH3噴出部の閉塞
を生じることなく、均一にNH3を噴出分布させ
ることができる。 In this way, by extending the length of the nozzle beyond the retention area of the gas to be treated, NH 3 injection can be performed at the exhaust gas rectification position, and the NH 3 jetting, which was another drawback, can be performed. The direction is also the seventh
As shown in the figure, the flow that hits the nozzle wall is
The gas flow is rectified in the nozzle pipe, resulting in a nearly parallel flow, and NH 3 can be ejected in parallel along this gas flow. Furthermore, by tapering the tip of the nozzle, it is possible to uniformly eject and distribute NH 3 without clogging the NH 3 ejecting part due to dust adhesion.
なお、第７図においては、NH3注入管５に配
置されたノズル６の全部に直管７が設けられた例
が示されているが、これは必ずしも全部に設ける
必要はなく、全てのノズルの先端部が被処理ガス
の滞留部よりも先方の位置にある場合は、例えば
NH3ガス噴出方向の偏流が著しい注入管５の元
部に近いノズルに重点的に設けてもよい。 In addition, although FIG. 7 shows an example in which straight pipes 7 are provided in all of the nozzles 6 arranged in the NH 3 injection pipe 5, it is not necessarily necessary to provide them in all, and all nozzles are provided with straight pipes 7. If the tip of the is located ahead of the retention area of the gas to be treated, for example,
It may be preferentially provided in the nozzle near the base of the injection pipe 5 where the NH 3 gas is significantly biased in the direction of ejection.
（発明の効果）
以上、本発明のNH3注入装置によれば、ダス
トの付着による注入ノズルの閉塞を防止すること
ができ、ノズル閉塞によるNH3注入量低下によ
る脱硝性能低下を防止することができる。また
NH3注入分布をなくし、NOX量分布に沿つた適
切なNH3注入が可能となり、脱硝性能の向上、
NH3消費量節減に多大の効果が得られる。(Effects of the Invention) As described above, according to the NH 3 injection device of the present invention, it is possible to prevent the injection nozzle from being blocked due to adhesion of dust, and it is possible to prevent the denitrification performance from decreasing due to a decrease in the NH 3 injection amount due to the nozzle blockage. can. Also
Eliminates the NH 3 injection distribution and enables appropriate NH 3 injection along the NO X amount distribution, improving denitrification performance.
A great effect can be obtained in reducing NH 3 consumption.
第１図は、排ガス脱硝に用いるNH3注入装置
の全体を示す説明図、第２図は、従来技術での１
本当りから噴出するNH3の流れを模式化した側
面図、第３図は、NH3注入管廻りのガスの流れ
を模式化した断面図、第４図は、従来技術でのノ
ズル部へのダスト付着状況を示す図、第５図は、
本発明の一実施例を示すNH3注入管のノズル取
付状態を示す断面図、第６図は、ノズルを長く
し、その先端にキヤツプを付けた場合のキヤツプ
先端のガス流れを模式化した図、第７図は、本発
明の一実施例におけるNH3注入管のノズル内の
NH3の流れを模式化して示す図、第８図は、短
管を取り付けた場合のNH3噴出部のガス流を示
す図、第９図は、ダストの付着状況を示す図、第
１０図は、本発明に用いる短管の先端の形状例を
示す拡大断面図である。
１……ダクト、２……ヘツダー、３……バル
ブ、４……オリフイス、５……注入管、６……ノ
ズル、７……直管、８……噴出NH3、９……オ
リフイス、１０……堆積ダスト、１１……渦流、
１２……キヤツプ。
Fig. 1 is an explanatory diagram showing the entire NH 3 injection device used for exhaust gas denitrification, and Fig. 2 is an explanatory diagram showing the entire NH 3 injection device used for exhaust gas denitrification.
Fig. 3 is a side view schematically showing the flow of NH 3 ejected from the nozzle, Fig. 3 is a cross-sectional view schematically showing the flow of gas around the NH 3 injection pipe, and Fig. 4 is a diagram showing the flow of gas into the nozzle section using the conventional technology. Figure 5 shows the dust adhesion situation.
FIG. 6 is a cross-sectional view showing the nozzle installation state of an NH 3 injection pipe according to an embodiment of the present invention, and is a schematic diagram of the gas flow at the tip of the cap when the nozzle is lengthened and a cap is attached to the tip. , FIG. 7 shows the inside of the nozzle of the NH 3 injection pipe in one embodiment of the present invention.
Figure 8 is a diagram schematically showing the flow of NH 3. Figure 8 is a diagram showing the gas flow at the NH 3 jetting part when a short pipe is installed. Figure 9 is a diagram showing the state of dust adhesion. Figure 10. FIG. 2 is an enlarged sectional view showing an example of the shape of the tip of the short tube used in the present invention. 1... Duct, 2... Header, 3... Valve, 4... Orifice, 5... Injection pipe, 6... Nozzle, 7... Straight pipe, 8... Output NH 3 , 9... Orifice, 10 ...accumulated dust, 11...vortex,
12...cap.
Claims (1)
入するために、ガス流れと並行に数個の注入ノズ
ルが設置されている注入管をダクト内に配置した
アンモニア注入装置において、前記注入管に設置
されているノズルの長さを該注入管によつて生じ
る被処理ガスの滞留部よりも先方に延長し、該ノ
ズル先端部を先細としたことを特徴とするアンモ
ニア注入装置。 ２ 特許請求の範囲第１項において、ノズルをキ
ヤツプ付きノズルにした場合、キヤツプの位置を
ノズルの半分以下の位置に取付けたことを特徴と
するアンモニア注入装置。[Scope of Claims] 1. In an ammonia injection device in which an injection pipe in which several injection nozzles are installed in parallel with the gas flow is arranged in a duct to inject ammonia as a reducing agent in a flue gas denitrification device, An ammonia injection device, characterized in that the length of the nozzle installed in the injection pipe is extended beyond the retention area of the gas to be treated generated by the injection pipe, and the tip of the nozzle is tapered. 2. The ammonia injection device according to claim 1, characterized in that when the nozzle is a nozzle with a cap, the cap is installed at a position less than half of the nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240055A JPS60132624A (en) | 1983-12-20 | 1983-12-20 | Ammonia injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240055A JPS60132624A (en) | 1983-12-20 | 1983-12-20 | Ammonia injection apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60132624A JPS60132624A (en) | 1985-07-15 |
| JPH0440056B2 true JPH0440056B2 (en) | 1992-07-01 |
Family
ID=17053806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58240055A Granted JPS60132624A (en) | 1983-12-20 | 1983-12-20 | Ammonia injection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60132624A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63122625U (en) * | 1987-02-03 | 1988-08-09 | ||
| JP3862134B2 (en) * | 1999-12-01 | 2006-12-27 | 株式会社日立プラントテクノロジー | Ammonia gas injection device |
| US8317390B2 (en) * | 2010-02-03 | 2012-11-27 | Babcock & Wilcox Power Generation Group, Inc. | Stepped down gas mixing device |
| US9518734B2 (en) | 2013-01-28 | 2016-12-13 | General Electric Technology Gmbh | Fluid distribution and mixing grid for mixing gases |
| US20150064083A1 (en) * | 2013-08-28 | 2015-03-05 | Alstom Technology Ltd | Injector grid for high and low dust environment selective catalytic reduction systems |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118727A (en) * | 1980-02-26 | 1981-09-17 | Kawasaki Heavy Ind Ltd | Fluid mixer |
-
1983
- 1983-12-20 JP JP58240055A patent/JPS60132624A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118727A (en) * | 1980-02-26 | 1981-09-17 | Kawasaki Heavy Ind Ltd | Fluid mixer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60132624A (en) | 1985-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |