JPH05103951A - Exhaust gas-denitrating method and device therefor - Google Patents
Exhaust gas-denitrating method and device thereforInfo
- Publication number
- JPH05103951A JPH05103951A JP3291863A JP29186391A JPH05103951A JP H05103951 A JPH05103951 A JP H05103951A JP 3291863 A JP3291863 A JP 3291863A JP 29186391 A JP29186391 A JP 29186391A JP H05103951 A JPH05103951 A JP H05103951A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- ammonia
- internal combustion
- combustion engine
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関の排ガスにア
ンモニアを還元剤として添加することにより、前記排ガ
スから窒素酸化物を除去する脱硝方法及びその装置に関
するものであり、特に前記排ガス中の窒素酸化物の濃度
に応じた量のアンモニアが供給されるようにした脱硝方
法及びその装置に関するものであって、ディーゼル機関
の排ガスの脱硝を行うのに適したものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denitration method and apparatus for removing nitrogen oxides from exhaust gas of an internal combustion engine by adding ammonia as a reducing agent to the exhaust gas. The present invention relates to a denitration method and apparatus for supplying an amount of ammonia according to the concentration of nitrogen oxides, and is suitable for denitration of exhaust gas of a diesel engine.
【０００２】[0002]
【従来の技術】内燃機関の排ガスには窒素酸化物が含ま
れており、これをそのまま大気中に放出すると大気を汚
染するので、前記排ガスから窒素酸化物を除去する処理
が行われており、その処理方法の代表的手段としてはア
ンモニアを添加して反応させ、窒素酸化物を窒素に還元
する方法である。その際の必要なアンモニアの量は窒素
酸化物に対する化学的量論量であり、アンモニア自体が
有害な物質であるから、アンモニアの添加量は過剰とな
らないようにその供給を制御するのが普通である。2. Description of the Related Art Exhaust gas from an internal combustion engine contains nitrogen oxides, and if it is released into the atmosphere as it is, it pollutes the atmosphere. Therefore, a process for removing nitrogen oxides from the exhaust gas is performed. As a typical means of the treatment method, there is a method in which ammonia is added and reacted to reduce nitrogen oxide to nitrogen. The amount of ammonia required at that time is a stoichiometric amount with respect to nitrogen oxides, and ammonia itself is a harmful substance.Therefore, it is usual to control the supply of ammonia so that it is not added excessively. is there.
【０００３】従来、排ガス脱硝装置におけるアンモニア
注入制御は、エンジンの起動、停止信号を発停信号発生
装置より受け取ってアンモニア注入バルブの開閉を行う
方法や、脱硝反応器内部での排ガス温度が脱硝反応に最
適となったときに前記バルブを開く方法がとられてい
る。しかし、前記した条件によるバルブの開閉のみで
は、窒素酸化物の発生量に対応したアンモニア供給量の
微妙な制御ができないため、規制値を満足できないこと
や未反応のアンモニアの排出量が増加する危険があるこ
との問題がある。Conventionally, ammonia injection control in an exhaust gas denitration apparatus is performed by a method of opening and closing an ammonia injection valve by receiving an engine start / stop signal from a start / stop signal generating apparatus, and an exhaust gas temperature inside a denitration reactor for denitration reaction. The method is to open the valve when it is optimal. However, only opening and closing the valve under the above conditions cannot delicately control the amount of ammonia supply corresponding to the amount of nitrogen oxides generated, so that the regulation value cannot be satisfied and the amount of unreacted ammonia discharged increases. There is a problem with that.
【０００４】そのため、窒素酸化物の発生量に対応して
アンモニア供給量を制御する方法も考案されているが、
この方法では常に窒素酸化物濃度、排ガス量等を測定
し、アンモニア供給量を計算する必要があり、ＮＯx 計
の調整、ガス採取管の清掃などのメンテナンスが必要
で、管理コストも高くなるという問題がある。また、そ
の他の制御手段として、内燃機関の負荷によりアンモニ
ア供給量を制御する方法や、特開平２−２２３６２３号
公報には、アンモニア供給量を予めシーケンサによって
学習させて供給する装置が開示されているいるが、窒素
酸化物の発生要因は複雑であって、これらの方法によっ
ては窒素酸化物の発生量に十分対応するアンモニア量を
供給するように制御することが出来ながった。Therefore, a method of controlling the amount of ammonia supplied in accordance with the amount of nitrogen oxides produced has been devised.
According to this method, it is necessary to constantly measure the nitrogen oxide concentration, the amount of exhaust gas, etc., and calculate the amount of ammonia supplied, which requires maintenance such as adjustment of the NO x meter and cleaning of the gas sampling pipe, resulting in high management costs. There's a problem. Further, as other control means, a method of controlling the ammonia supply amount by the load of the internal combustion engine, and Japanese Patent Laid-Open No. 223623/1990 disclose a device for learning and supplying the ammonia supply amount by a sequencer in advance. However, the factors that generate nitrogen oxides are complicated, and it has been impossible to control so as to supply an amount of ammonia that sufficiently corresponds to the amount of nitrogen oxides generated by these methods.
【０００５】[0005]
【発明が解決しようとする課題】このため、内燃機関の
排ガスの窒素酸化物の発生量に最も高い関連性をもち、
それでいて最も容易に測定或いは計測しうる要因を見い
だすことにより、アンモニア供給量を適切に制御できる
方法を開発することが望ましい。本発明は、従来方法の
アンモニア供給の制御が適切に行われないという欠点を
解消し、前記した容易に測定でき、かつ排ガスの窒素酸
化物の発生量に高い関連性をもつ要因により適切に制御
できる脱硝方法及びその装置を提供しようとするもので
ある。Therefore, it has the highest relation to the amount of nitrogen oxides generated in the exhaust gas of an internal combustion engine,
Nevertheless, it is desirable to develop a method capable of appropriately controlling the ammonia supply amount by finding the factor that can be measured or measured most easily. The present invention solves the drawback of the conventional method that the supply of ammonia is not properly controlled, and appropriately controls it by the above-mentioned factors that can be easily measured and are highly related to the amount of nitrogen oxides generated in exhaust gas. An object of the present invention is to provide a denitration method and an apparatus therefor.
【０００６】[0006]
【課題を解決するための手段】本発明者は、前記の問題
点を解決するために、内燃機関の排ガスダクトに窒素酸
化物の還元剤としてのアンモニアを供給する装置を設置
した排ガス脱硝装置において、種々の項目について排ガ
ス中の窒素酸化物濃度との関係を調べた。そして、窒素
酸化物濃度に影響を与えるパラメータの一つと考えられ
る内燃機関燃焼用吸入空気の絶対湿度と窒素酸化物濃度
との関係を、負荷が一定の場合において調べたところ、
図２に示すように非常に相関性が高く、窒素酸化物濃度
は吸入空気の絶対湿度の一次関数として表すことができ
ることを見いだした。このため窒素酸化物量は排ガス量
が一定の時、窒素酸化物濃度に比例する。また、吸入空
気の絶対湿度と同様に窒素酸化物濃度に影響を与えるパ
ラメータの一つと考えられる前記吸入空気の温度と窒素
酸化物濃度との関係を負荷が一定の場合について調べた
ところ、図３に示すように非常に相関性が高く、窒素酸
化物濃度は吸入空気の温度の一次関数として表すことが
できることを見いだした。In order to solve the above-mentioned problems, the present inventor has proposed an exhaust gas denitration system in which an exhaust gas duct of an internal combustion engine is provided with a device for supplying ammonia as a reducing agent for nitrogen oxides. The relationship between various items and the concentration of nitrogen oxides in exhaust gas was investigated. Then, the relationship between the absolute humidity of the intake air for combustion of the internal combustion engine and the nitrogen oxide concentration, which is considered to be one of the parameters that affect the nitrogen oxide concentration, was examined when the load was constant,
As shown in FIG. 2, it has been found that the nitrogen oxide concentration is highly correlated and can be expressed as a linear function of the absolute humidity of intake air. Therefore, the amount of nitrogen oxides is proportional to the concentration of nitrogen oxides when the amount of exhaust gas is constant. Further, the relationship between the temperature of the intake air and the nitrogen oxide concentration, which is considered to be one of the parameters that influence the nitrogen oxide concentration similarly to the absolute humidity of the intake air, was examined in the case of a constant load. It was found that the nitrogen oxide concentration can be expressed as a linear function of the temperature of intake air as shown in Fig.
【０００７】本発明は、以上の知見に基づいてなされた
ものであって、次のような手段からなるものである。 （１）内燃機関の排ガスを外部に排出する排ガスダクト
の途中で前記排ガスに窒素酸化物の還元剤としてアンモ
ニアを供給し、そのアンモニアを供給した排ガスを窒素
酸化物脱硝用触媒に通して反応させる排ガス脱硝方法に
おいて、前記内燃機関の燃焼用吸入空気の絶対湿度を変
数のひとつとして前記排ガスに対するアンモニアの供給
量を制御することを特徴とする排ガス脱硝方法。The present invention has been made on the basis of the above findings, and comprises the following means. (1) Ammonia is supplied to the exhaust gas as a reducing agent of nitrogen oxides in the middle of an exhaust gas duct that discharges the exhaust gas of the internal combustion engine, and the exhaust gas supplied with the ammonia is passed through a nitrogen oxide denitration catalyst to react. In the exhaust gas denitration method, the amount of ammonia supplied to the exhaust gas is controlled by using the absolute humidity of intake air for combustion of the internal combustion engine as one of the variables.
【０００８】（２）前記内燃機関の燃焼用吸入空気の温
度を変数として前記排ガスに対するアンモニアの供給量
を制御することを特徴とする前記（１）項記載の排ガス
脱硝方法。 （３）内燃機関の排ガスを外部に排出する排ガスダクト
の途中に、窒素酸化物の還元剤としてのアンモニア供給
装置を設け、前記アンモニア供給装置の下流側に窒素酸
化物脱硝用触媒を有する反応器を設置した排ガス脱硝装
置において、前記内燃機関の燃焼用吸入空気の絶対湿度
を測定する測定装置と、前記測定装置からの信号により
前記アンモニア供給装置におけるアンモニア供給量を制
御する制御装置を設けたことを特徴とする排ガス脱硝装
置。(2) The exhaust gas denitration method as described in the above item (1), wherein the supply amount of ammonia to the exhaust gas is controlled by using the temperature of the intake air for combustion of the internal combustion engine as a variable. (3) A reactor having an ammonia supply device as a reducing agent for nitrogen oxides provided in the middle of an exhaust gas duct for discharging exhaust gas of an internal combustion engine, and having a nitrogen oxide denitration catalyst downstream of the ammonia supply device. In the exhaust gas denitration device, the measurement device for measuring the absolute humidity of the intake air for combustion of the internal combustion engine and the control device for controlling the ammonia supply amount in the ammonia supply device by the signal from the measurement device are provided. Exhaust gas denitration equipment characterized by
【０００９】本発明において、燃焼用吸入空気の絶対湿
度或いは温度を測定することは極めて容易であって、広
く使用されている絶対湿度計或いは温度計を使用すれば
よく、測定対象が空気であるため湿度計等が汚れること
もない。また、吸入空気の絶対湿度等は内燃機関の周囲
の空気のそれらと同じであるから、空気の吸気管中で測
定する必要はなく、内燃機関の周囲或いは前記吸気管の
吸気口付近の適当な箇所で測定すればよい。In the present invention, it is extremely easy to measure the absolute humidity or temperature of the intake air for combustion, and a widely used absolute hygrometer or thermometer may be used, and the measurement object is air. Therefore, the hygrometer will not get dirty. Further, since the absolute humidity of the intake air is the same as those of the air around the internal combustion engine, it is not necessary to measure it in the intake pipe of the air, and an appropriate amount around the internal combustion engine or near the intake port of the intake pipe is appropriate. It can be measured at the location.
【００１０】そして、この測定値に基づいてアンモニア
供給装置における供給量を変化させることにより、制御
を行う。その供給量の変化は、予め作成した図２の相関
関係に従って行う。実際に行うにあたっては、例えば湿
度検出器を備えた絶対湿度計で吸入空気の絶対湿度を測
定し、前記絶対湿度計からの信号を演算器などを備えた
制御装置へ送り、流量調整弁の開閉を制御してアンモニ
アの供給量を適正に調節する。Then, the control is performed by changing the supply amount in the ammonia supply device based on the measured value. The change of the supply amount is performed according to the correlation of FIG. 2 created in advance. When actually performing, for example, the absolute humidity of the intake air is measured with an absolute hygrometer equipped with a humidity detector, and the signal from the absolute hygrometer is sent to a control device equipped with a calculator, etc., to open / close the flow rate adjusting valve. Is controlled to properly adjust the supply amount of ammonia.
【００１１】また、前記した内燃機関の排ガスの窒素酸
化物濃度についての諸要因の検討においては、内燃機関
の負荷と窒素酸化物量とは図４に示すように、非常に相
関性が高く、窒素酸化物量は内燃機関の負荷の一次関数
として表すことができることが判った。つまり、内燃機
関の負荷が増加すると、排ガス量が増加するため、窒素
酸化物濃度と排ガス量との積である窒素酸化物量は増加
することになる。従って、窒素酸化物量は内燃機関の負
荷と燃焼用吸入空気の絶対湿度に関する一次関数として
表される。つまり、脱硝に必要なアンモニア量は、内燃
機関の負荷と燃焼用吸入空気の絶対湿度の一次関数とし
て制御することが出来る。この方法によれば、内燃機関
の負荷のみで制御を行う場合に比べて燃焼用吸入空気の
湿度変化に対応でき、より精密なアンモニア供給量制御
が行える。In the examination of various factors concerning the nitrogen oxide concentration of the exhaust gas of the internal combustion engine, the load of the internal combustion engine and the amount of nitrogen oxide have a very high correlation as shown in FIG. It has been found that the amount of oxide can be expressed as a linear function of the load of the internal combustion engine. That is, when the load on the internal combustion engine increases, the amount of exhaust gas increases, so the amount of nitrogen oxides, which is the product of the concentration of nitrogen oxides and the amount of exhaust gas, increases. Therefore, the amount of nitrogen oxides is expressed as a linear function relating to the load of the internal combustion engine and the absolute humidity of the intake air for combustion. That is, the amount of ammonia required for denitration can be controlled as a linear function of the load of the internal combustion engine and the absolute humidity of the intake air for combustion. According to this method, it is possible to cope with a change in the humidity of the intake air for combustion as compared with the case where the control is performed only by the load of the internal combustion engine, and more precise ammonia supply amount control can be performed.
【００１２】さらに、前述したように、内燃機関の排ガ
スの窒素酸化物濃度は、燃焼用吸入空気の温度と図３に
示すような、一次関数で表される関係にあるから、窒素
酸化物量は内燃機関の負荷と燃焼用吸入空気の温度の一
次関数として表される。従って、脱硝に必要なアンモニ
ア量はこの内燃機関の負荷と燃焼用吸入空気の温度の一
次関数として制御することが出来る。この方法によって
も、内燃機関の負荷のみで制御を行う場合に比べて燃焼
用吸入空気の温度変化に対応でき、より精密なアンモニ
ア供給量制御が行える。Further, as described above, the concentration of nitrogen oxides in the exhaust gas of the internal combustion engine has a relationship with the temperature of the intake air for combustion represented by a linear function as shown in FIG. It is expressed as a linear function of the load of the internal combustion engine and the temperature of the intake air for combustion. Therefore, the amount of ammonia required for denitration can be controlled as a linear function of the load of the internal combustion engine and the temperature of the intake air for combustion. This method can also cope with the temperature change of the intake air for combustion as compared with the case where the control is performed only by the load of the internal combustion engine, and more precise ammonia supply amount control can be performed.
【００１３】これらのアンモニア供給量の制御因子とな
りうる燃焼用吸入空気の絶対湿度と温度の両方を用いて
アンモニア供給量を制御すれば、より精密な制御ができ
る。その際前記した内燃機関の負荷も制御因子に入れて
制御を行うことが好ましい。これらの制御手段による脱
硝方法及びその装置においては、高価で頻繁なメンテナ
ンスが必要なＮＯx 計が不要で、温度計と湿度計を用い
るだけで実施出来る。またこれらの計測器の検出器は排
ガス中に設置する必要がないので汚損などの危険がな
い。If the ammonia supply amount is controlled by using both the absolute humidity and the temperature of the intake air for combustion, which can be a controlling factor for the ammonia supply amount, more precise control can be performed. At that time, it is preferable to control the load of the internal combustion engine by including it in the control factor. In denitration method and apparatus according to these control means, requires no expensive and frequent maintenance is required NO x meter, it can be implemented only by using a thermometer and hygrometer. Moreover, since the detectors of these measuring instruments do not need to be installed in the exhaust gas, there is no risk of contamination.
【００１４】本発明の脱硝方法及びその装置を実施する
のに必要な脱硝反応器やそれに用いる触媒、測定装置、
制御装置などは、個々に公知のものを使用すればよい。
具体的な脱硝装置の例については実施例において説明す
る。本発明は、アンモニアの供給によって脱硝を行うよ
うな内燃機関、例えば大型のディーゼル機関の排ガスの
処理を行うのに適する。A denitration reactor required for carrying out the denitration method and apparatus of the present invention, a catalyst used therein, a measuring device,
As the control device and the like, known devices may be used individually.
A specific example of the denitration device will be described in Examples. INDUSTRIAL APPLICABILITY The present invention is suitable for treating exhaust gas from an internal combustion engine, such as a large diesel engine, that performs denitration by supplying ammonia.
【００１５】[0015]
【作用】内燃機関の燃焼用吸入空気の絶対湿度又は温度
は、前記内燃機関の排ガス中の窒素酸化物濃度と非常に
高い相関性を有し、図２〜３に示すように一次関数で表
される関係にあるので、これらの因子を用いてアンモニ
ア供給量を適正に制御することが出来る。The absolute humidity or temperature of the intake air for combustion of the internal combustion engine has a very high correlation with the concentration of nitrogen oxides in the exhaust gas of the internal combustion engine, and is represented by a linear function as shown in FIGS. Therefore, it is possible to properly control the ammonia supply amount using these factors.
【００１６】[0016]
【実施例】以下、実施例によって本発明を具体的に説明
するが、本発明はこの実施例のみに限定されるものでは
ない。 実施例 図１に示す脱硝装置により、ディーゼル機関の排ガスの
脱硝を行った。図１において、ディーゼル機関１は発電
機１１を駆動して発電を行うためのものであるが、ディ
ーゼル機関１より排出された排ガスは、排ガスダクト９
中に設置されたアンモニア注入器８より注入されたアン
モニアと混合され、脱硝塔２に進入する。脱硝塔２に進
入した排ガスは脱硝塔２内に設置された触媒の作用によ
って脱硝されて排出ダクト１０より外気に排出される。
アンモニア貯留ボンベ３から流量調整弁７を通ってアン
モニア注入器８より注入されるアンモニアの供給量は、
ディーゼル機関１の負荷信号線６で送られる信号と、絶
対湿度計１３からの吸入空気絶対湿度信号線１４で送ら
れる信号に対する一次関数として演算器５で計算され
る。アンモニア供給量演算器５は、流量調整弁７が必要
なアンモニア供給量に対応した開度になるように流量調
整弁コントローラ４に信号を出す。絶対湿度計１３は湿
度検出器１２をディーゼル機関１の吸気口１５の近くに
設置して燃焼用吸入空気の絶対湿度を測定する。この制
御ではディーゼル機関の負荷と吸入空気の絶対湿度の変
化に良く追従して適正なアンモニア量を供給することが
出来る。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Example The exhaust gas of a diesel engine was denitrated by the denitration device shown in FIG. In FIG. 1, the diesel engine 1 is for driving a generator 11 to generate electric power, but the exhaust gas discharged from the diesel engine 1 is exhaust gas duct 9
It is mixed with the ammonia injected from the ammonia injector 8 installed therein and enters the denitration tower 2. The exhaust gas that has entered the denitration tower 2 is denitrified by the action of the catalyst installed in the denitration tower 2 and is exhausted to the outside air from the exhaust duct 10.
The supply amount of ammonia injected from the ammonia storage cylinder 3 through the flow rate adjusting valve 7 and the ammonia injector 8 is
It is calculated by the calculator 5 as a linear function with respect to the signal sent by the load signal line 6 of the diesel engine 1 and the signal sent by the intake air absolute humidity signal line 14 from the absolute hygrometer 13. The ammonia supply amount calculator 5 outputs a signal to the flow rate adjustment valve controller 4 so that the flow rate adjustment valve 7 has an opening degree corresponding to the required ammonia supply amount. The absolute hygrometer 13 installs the humidity detector 12 near the intake port 15 of the diesel engine 1 to measure the absolute humidity of the intake air for combustion. With this control, it is possible to supply a proper amount of ammonia by following the changes in the load of the diesel engine and the absolute humidity of the intake air well.
【００１７】この実施例では絶対湿度計１３を使用した
が、その代わりに温度計を用いることもできるし、また
絶対湿度計１３と温度計とを併用することも出来る。Although the absolute hygrometer 13 is used in this embodiment, a thermometer may be used instead of it, or the absolute hygrometer 13 and the thermometer may be used in combination.
【００１８】[0018]
【発明の効果】本発明は、前記のような手段を有するこ
とにより、以下のような効果がある。 （１）アンモニアは常に排ガスの窒素酸化物量に対応し
た量で供給されるので、効率の良い安定した脱硝が行え
ると同時に、アンモニアリークの危険性が低減できる。 （２）アンモニア流量の制御は、燃焼用吸入空気の絶対
湿度又は温度、さらに実際上それらとともに内燃機関の
負荷によって行うので、ＮＯx 計が不要になり、装置が
簡略化され、コストが低減できる。また、計測器の分の
省スペースにもなり、計測器の汚染もほとんどない。 （３）アンモニア供給量を決定する演算器の係数の変更
が容易にでき、簡易な調整で制御が確実にできる。The present invention has the following effects by having the above means. (1) Since ammonia is always supplied in an amount corresponding to the amount of nitrogen oxides in the exhaust gas, efficient and stable denitration can be performed, and at the same time, the risk of ammonia leakage can be reduced. (2) Since the control of the ammonia flow rate is performed by the absolute humidity or temperature of the intake air for combustion, and actually by the load of the internal combustion engine together with them, the NO x meter is not required, the device is simplified, and the cost can be reduced. .. Moreover, the space for the measuring instrument is saved, and the measuring instrument is hardly contaminated. (3) The coefficient of the arithmetic unit that determines the ammonia supply amount can be easily changed, and the control can be surely performed by simple adjustment.
【図１】本発明の実施例における排ガスの脱硝装置の模
式図を示す。FIG. 1 shows a schematic diagram of an exhaust gas denitration device in an example of the present invention.
【図２】排ガスの窒素酸化物濃度と燃焼用吸入空気の絶
対湿度との関係を表すグラフを示す。FIG. 2 is a graph showing the relationship between the nitrogen oxide concentration of exhaust gas and the absolute humidity of intake air for combustion.
【図３】排ガスの窒素酸化物濃度と燃焼用吸入空気の温
度との関係を表すグラフを示す。FIG. 3 is a graph showing the relationship between the concentration of nitrogen oxides in exhaust gas and the temperature of intake air for combustion.
【図４】排ガスの窒素酸化物量と内燃機関の負荷との関
係を表すグラフを示す。FIG. 4 is a graph showing the relationship between the amount of nitrogen oxides in exhaust gas and the load on an internal combustion engine.
１ ディーゼル機関 ２ 脱硝塔 ３ アンモニア貯留ボンベ ４ 流量調整弁コントローラ ５ アンモニア供給量演算器 ６ ディーゼル機関負荷信号線 ７ 流量調整弁 ８ アンモニア注入器 ９ 排ガスダクト １０ 排ガス排出ダクト １１ 発電機 １２ 湿度検出器 １３ 絶対湿度計 １４ 吸入空気絶対湿度信号線 １５ ディーゼル機関吸気口 1 Diesel engine 2 Denitration tower 3 Ammonia storage cylinder 4 Flow rate adjusting valve controller 5 Ammonia supply amount calculator 6 Diesel engine load signal line 7 Flow rate adjusting valve 8 Ammonia injector 9 Exhaust gas duct 10 Exhaust gas exhaust duct 11 Generator 12 Humidity detector 13 Absolute hygrometer 14 Intake air Absolute humidity signal line 15 Diesel engine intake port
Claims (3)
ダクトの途中で前記排ガスに窒素酸化物の還元剤として
アンモニアを供給し、そのアンモニアを供給した排ガス
を窒素酸化物脱硝用触媒に通して反応させる排ガス脱硝
方法において、前記内燃機関の燃焼用吸入空気の絶対湿
度を変数のひとつとして前記排ガスに対するアンモニア
の供給量を制御することを特徴とする排ガス脱硝方法。1. An ammonia gas is supplied to the exhaust gas as a reducing agent for nitrogen oxides in the middle of an exhaust gas duct for discharging the exhaust gas of an internal combustion engine to the outside, and the exhaust gas supplied with the ammonia is passed through a nitrogen oxide denitration catalyst. In the exhaust gas denitration method for reacting, the amount of ammonia supplied to the exhaust gas is controlled by using the absolute humidity of intake air for combustion of the internal combustion engine as one of the variables.
数として前記排ガスに対するアンモニアの供給量を制御
することを特徴とする請求項１記載の排ガス脱硝方法。2. The exhaust gas denitration method according to claim 1, wherein the supply amount of ammonia to the exhaust gas is controlled by using the temperature of the intake air for combustion of the internal combustion engine as a variable.
ダクトの途中に、窒素酸化物の還元剤としてのアンモニ
ア供給装置を設け、前記アンモニア供給装置の下流側に
窒素酸化物脱硝用触媒を有する反応器を設置した排ガス
脱硝装置において、前記内燃機関の燃焼用吸入空気の絶
対湿度を測定する測定装置と、前記測定装置からの信号
により前記アンモニア供給装置におけるアンモニア供給
量を制御する制御装置を設けたことを特徴とする排ガス
脱硝装置。3. An ammonia supply device as a reducing agent for nitrogen oxides is provided in the middle of an exhaust gas duct for discharging exhaust gas of an internal combustion engine to the outside, and a nitrogen oxide denitration catalyst is provided downstream of the ammonia supply device. In an exhaust gas denitration device equipped with a reactor, a measuring device for measuring the absolute humidity of the intake air for combustion of the internal combustion engine, and a control device for controlling the ammonia supply amount in the ammonia supplying device by a signal from the measuring device are provided. An exhaust gas denitration device characterized in that
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291863A JPH05103951A (en) | 1991-10-14 | 1991-10-14 | Exhaust gas-denitrating method and device therefor |
| CN92111501A CN1041172C (en) | 1991-10-14 | 1992-10-14 | Exhaust gas denitration method and apparatus therefor |
| KR1019920018872A KR100220447B1 (en) | 1991-10-14 | 1992-10-14 | Exhaust gas denitration method and apparatus therefor |
| CN98106678A CN1090047C (en) | 1991-10-14 | 1998-04-20 | Waste gas denitration method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3291863A JPH05103951A (en) | 1991-10-14 | 1991-10-14 | Exhaust gas-denitrating method and device therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05103951A true JPH05103951A (en) | 1993-04-27 |
Family
ID=17774406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3291863A Pending JPH05103951A (en) | 1991-10-14 | 1991-10-14 | Exhaust gas-denitrating method and device therefor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH05103951A (en) |
| KR (1) | KR100220447B1 (en) |
| CN (2) | CN1041172C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003065037A (en) * | 2001-08-30 | 2003-03-05 | Miura Co Ltd | Control method for denitration device |
| JP2014020290A (en) * | 2012-07-18 | 2014-02-03 | Osaka Gas Co Ltd | Reductant injection device and denitrification equipment |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100515044B1 (en) * | 2000-12-12 | 2005-09-14 | 주식회사 포스코 | Apparatus for reducing nitrogen oxide in the waste gas of sinter machine |
| JP3718209B2 (en) * | 2003-10-03 | 2005-11-24 | 日産ディーゼル工業株式会社 | Engine exhaust purification system |
| CN100416054C (en) * | 2003-10-22 | 2008-09-03 | 日产柴油机车工业株式会社 | Engine controller and engine operating method |
| JP3687915B2 (en) * | 2003-10-27 | 2005-08-24 | 日産ディーゼル工業株式会社 | Liquid discrimination device |
| JP3687916B2 (en) * | 2003-10-28 | 2005-08-24 | 日産ディーゼル工業株式会社 | Engine exhaust purification system |
| JP3687917B2 (en) * | 2003-10-31 | 2005-08-24 | 日産ディーゼル工業株式会社 | Liquid reducing agent concentration and remaining amount detection device |
| CN100377762C (en) * | 2005-01-13 | 2008-04-02 | 辽宁省燃烧工程技术中心 | Method and special system for removing nitrogen oxide from flume gas of coal-burning power station |
| DE102006047019A1 (en) * | 2006-10-02 | 2008-04-03 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Exhaust gas system's reduction agent containing gas flow providing method for internal combustion engine, involves adding reduction agent containing gas flow to exhaust gas of internal combustion engine |
| DE102007046460A1 (en) * | 2007-09-28 | 2009-04-02 | Daimler Ag | A method for reducing the emission of nitrogen dioxide in a motor vehicle with a lean-burn engine |
| JP4764463B2 (en) * | 2008-09-22 | 2011-09-07 | 株式会社日本自動車部品総合研究所 | Exhaust gas purification control device and exhaust gas purification system for internal combustion engine |
| CN101530740B (en) * | 2009-03-17 | 2012-07-25 | 山东丰元化学股份有限公司 | Process for treating tail gas generated by producing oxalic acid |
| US8459243B2 (en) * | 2009-07-31 | 2013-06-11 | Ford Global Technologies, Llc | Method, systems and sensor for detecting humidity |
| JP5575701B2 (en) * | 2011-05-18 | 2014-08-20 | 住友重機械工業株式会社 | Denitration apparatus and denitration method |
| KR20220133720A (en) * | 2021-03-25 | 2022-10-05 | 에스엠씨케미칼(주) | Ammonia vaporization accelerating device, denitrification device using the same, and incinerator system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5633025A (en) * | 1979-08-28 | 1981-04-03 | Babcock Hitachi Kk | Control method for injection quantity of ammonia |
| DE3704030A1 (en) * | 1987-02-10 | 1988-08-18 | Ruhrgas Ag | Process for separating off nitrogen oxides from exhaust gases by selective catalytic reduction |
| JPS647930A (en) * | 1987-06-30 | 1989-01-11 | Mitsubishi Heavy Ind Ltd | Method for denitrating exhaust gas from internal-combustion engine |
| JP2551173B2 (en) * | 1989-12-05 | 1996-11-06 | 株式会社新潟鐵工所 | Denitrification method for internal combustion engine exhaust gas |
| JP3175112B2 (en) * | 1992-07-29 | 2001-06-11 | 株式会社ニコン | Charged particle beam exposure method |
-
1991
- 1991-10-14 JP JP3291863A patent/JPH05103951A/en active Pending
-
1992
- 1992-10-14 KR KR1019920018872A patent/KR100220447B1/en not_active IP Right Cessation
- 1992-10-14 CN CN92111501A patent/CN1041172C/en not_active Expired - Fee Related
-
1998
- 1998-04-20 CN CN98106678A patent/CN1090047C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003065037A (en) * | 2001-08-30 | 2003-03-05 | Miura Co Ltd | Control method for denitration device |
| JP2014020290A (en) * | 2012-07-18 | 2014-02-03 | Osaka Gas Co Ltd | Reductant injection device and denitrification equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1071852A (en) | 1993-05-12 |
| CN1206624A (en) | 1999-02-03 |
| KR100220447B1 (en) | 1999-09-15 |
| KR930007494A (en) | 1993-05-20 |
| CN1041172C (en) | 1998-12-16 |
| CN1090047C (en) | 2002-09-04 |
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