JPS6344925A - Denitration treatment of exhaust gas - Google Patents
Denitration treatment of exhaust gasInfo
- Publication number
- JPS6344925A JPS6344925A JP61188881A JP18888186A JPS6344925A JP S6344925 A JPS6344925 A JP S6344925A JP 61188881 A JP61188881 A JP 61188881A JP 18888186 A JP18888186 A JP 18888186A JP S6344925 A JPS6344925 A JP S6344925A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- ammonia
- concentration
- gas
- denitrification treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 169
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 161
- 239000007789 gas Substances 0.000 claims description 86
- 229910021529 ammonia Inorganic materials 0.000 claims description 53
- 239000012530 fluid Substances 0.000 claims description 11
- 239000004071 soot Substances 0.000 abstract description 9
- 238000007664 blowing Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 8
- 238000011084 recovery Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse 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
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
一般に、窒素酸化物（ＮＯｘ）の排出量が法的に規制さ
れているボイラーや加熱炉等にあっては、排気ガス中の
窒素酸化物量がかなり低減されるように工夫されている
が、かかる規制のないエンジンやガスタービンにあって
は、技術的に困難なこともあって、排気ガス中の窒素酸
化物量はさほど低減されておらず、したがって排気ガス
中の窒素酸化物を二次的に低減処理しておくことが必要
となる。本発明は、このようにエンジン、ガスタービン
から排出される排気ガス中の窒素酸化物を二次的に低減
処理する方法であって、特に、排気ガスを、これしこア
ンモニアガスを注入することによって、触媒の存在下で
選択還元脱硝処理させる方法に関するものである。[Detailed Description of the Invention] (Industrial Application Field) In general, in boilers, heating furnaces, etc. whose emissions of nitrogen oxides (NOx) are legally regulated, the amount of nitrogen oxides in the exhaust gas is However, due to technical difficulties in engines and gas turbines that do not have such regulations, the amount of nitrogen oxides in exhaust gas has not been significantly reduced. Therefore, it is necessary to carry out a secondary reduction treatment for nitrogen oxides in the exhaust gas. The present invention is a method for secondarily reducing nitrogen oxides in exhaust gas discharged from engines and gas turbines, and in particular, injects ammonia gas into the exhaust gas. This invention relates to a method for selective reduction denitrification treatment in the presence of a catalyst.
（従来の技術）
従来のこの種排気ガスの脱硝処理方法として、第２図に
示す如（、エンジン又はガスタービン２１から煙突２２
に至る排気ガスの排出管路２３に、アンモニアガス貯溜
装置２７からアンモニアガス注入管路２８を導いたアン
モニアガス混合器２４及び適宜の触媒を内装した触媒塔
２５を順次介設して、混合器２４内において排気ガスと
注入管路２８から注入したアンモニアガスとを混合させ
た上、窒素酸化物含有の排気ガスを、触媒塔２５内触媒
下でアンモニアによって選択還元脱硝処理させるように
する方法が良く知られている。(Prior Art) As a conventional denitration treatment method for this type of exhaust gas, as shown in FIG.
An ammonia gas mixer 24 leading an ammonia gas injection pipe 28 from an ammonia gas storage device 27 and a catalyst tower 25 equipped with an appropriate catalyst are successively installed in the exhaust gas discharge pipe 23 leading to the exhaust gas. There is a method in which the exhaust gas and the ammonia gas injected from the injection pipe 28 are mixed in the catalytic column 24, and then the nitrogen oxide-containing exhaust gas is selectively reduced and denitrated with ammonia under the catalyst in the catalyst column 25. well known.
ところで、かかる脱硝処理方法にあって脱硝処理を効果
的に行わしめるためには、アンモニアガスの注入量を排
気ガス中の窒素酸化物濃度に応じて制御しておくことが
必要である。By the way, in order to effectively perform the denitration treatment in such a denitration treatment method, it is necessary to control the amount of ammonia gas injected in accordance with the concentration of nitrogen oxides in the exhaust gas.
そこで、従来にあっては、排出管路２３におけるアンモ
ニアガス混合器２４の」１流側部位及び触媒塔２５の下
流側部位に夫々第１．第２窒素酸化物濃度検出器２９．
３０を設け、或は第２窒素酸化物濃度検出器３０のみを
設けて、注入管路２８に介設した流量調整弁３１を、制
御装置３２により第１．第２検出器２９．３０による検
出値しこ応じて制御するようにしている。すなわち、第
］及び第２窒素酸化物濃度検出器２９．３０を設ける場
合にあっては、制御装置３２により、面検出器２９．３
０によって検出された窒素酸化物濃度を比較して、所定
の脱硝率となるようにアンモニアガス注入紙を制御する
のであり、また第２窒素酸化物濃度検出器３０のみを設
けた場合にあっては、制御装置３２により、窒素酸化物
濃度検出器３０による検出値と予め設定した設定値とを
比較して、その偏差が零となるようにアンモニアガス注
入量を制御するのである。Therefore, in the past, the first stream side portion of the ammonia gas mixer 24 in the discharge pipe 23 and the downstream side portion of the catalyst column 25 were each provided with a first stream. Second nitrogen oxide concentration detector 29.
30, or only the second nitrogen oxide concentration detector 30 is provided, and the flow rate regulating valve 31 interposed in the injection pipe line 28 is controlled by the control device 32 to control the first nitrogen oxide concentration detector 30. The control is performed in accordance with the detected values by the second detectors 29 and 30. That is, in the case where the first and second nitrogen oxide concentration detectors 29.30 are provided, the control device 32 controls the surface detectors 29.3.
The ammonia gas injection paper is controlled so that a predetermined denitrification rate is obtained by comparing the nitrogen oxide concentrations detected by the nitrogen oxide concentration detector 30. The control device 32 compares the value detected by the nitrogen oxide concentration detector 30 with a preset value, and controls the amount of ammonia gas injected so that the deviation becomes zero.
（発明が解決しようとする問題点）
ところが、このように脱硝率又は脱硝処理済排気ガスに
おける窒素酸化物濃度を監視するのみでは、触媒塔２５
を経過した排気ガス中に多量のアンモニアガスがリーク
される虞れがある。(Problems to be Solved by the Invention) However, simply monitoring the denitrification rate or the nitrogen oxide concentration in the denitrified exhaust gas in this way does not
There is a risk that a large amount of ammonia gas may leak into the exhaust gas that has passed through the exhaust gas.
すなわち、例えば排気ガスが多量の煤塵を含む場合には
、触媒表面に煤塵が付着して触媒機能が低下し、アンモ
ニアガス注入量が１分であるにも拘らず、脱硝率が低下
することなる。そしてこのような状態となると、これを
窒素酸化物濃度検出器２９．３０が検出して、脱硝率を
設定範囲内に戻すべくアンモニアガス注入量が制御され
、つまり必要量以」−のアンモニアガスが注入され、そ
の結果、多量のリークアンモニアが発生することになる
。また、一般に第３図に示す如く、必要とする脱硝率が
低いときはリークアンモニア量は少ないが、ある程度高
くなるとリークアンモニア量が急激しこ増加する。That is, for example, if the exhaust gas contains a large amount of soot and dust, the soot and dust will adhere to the catalyst surface and the catalyst function will decrease, resulting in a decrease in the denitrification rate even though the amount of ammonia gas injection is 1 minute. . When this condition occurs, the nitrogen oxide concentration detector 29.30 detects this, and the amount of ammonia gas injected is controlled to return the denitrification rate to within the set range. is injected, resulting in a large amount of leaked ammonia. Further, as shown in FIG. 3, generally, when the required denitrification rate is low, the amount of leaked ammonia is small, but when it increases to a certain degree, the amount of leaked ammonia increases rapidly.
面してＪｌ：気ガス中に多量のリークアンモニアが発生
すると、種々の問題を生ずる。例えば、多量のアンモニ
アが煙突２２から大気中に放出されることから、公害問
題を生ずることは勿論、排出管路２３における触媒塔２
５の下流側に１１：熱回収装置を配設している場合には
、リークアンモニア濃度が一定濃度（例えば５ｐｐｍ程
度）を超えると、アンモニアと排気ガス中の酸化硫黄と
が反応して、その生成物たる酸性硫安が排熱回収装置表
面に析出し、該装置の機能を著しく低下させることにな
る。Jl: When a large amount of leaked ammonia is generated in gas, various problems occur. For example, since a large amount of ammonia is released into the atmosphere from the chimney 22, it not only causes pollution problems but also
11: If a heat recovery device is installed on the downstream side of 5, when the leak ammonia concentration exceeds a certain concentration (for example, about 5 ppm), ammonia and sulfur oxide in the exhaust gas will react and the The product, acidic ammonium sulfate, is deposited on the surface of the exhaust heat recovery device, significantly reducing the functionality of the device.
本発明は、排気ガス中の窒素酸化物濃度のみならずリー
クアンモニア濃度をも監視して、多量のリークアンモニ
アの発生を未然に防止し、もって１１記問題を生じるこ
となく排気ガスの脱硝処理を良好に行わしめうる方法を
提供することを目的とするものである。The present invention monitors not only the concentration of nitrogen oxides in exhaust gas but also the concentration of leaked ammonia, prevents the generation of large amounts of leaked ammonia, and thereby performs the denitration treatment of exhaust gas without causing the problem No. 11. The purpose is to provide a method that can be carried out satisfactorily.
（問題点を解決するだめの手段）
本発明は、エンジン又はガスタービンから導いた排気ガ
ス排出経路における脱硝処理領域内で、窒素酸化物含有
の排気ガスを、これにアンモニアガスを注入することに
よって、触媒の存在下で選択還元脱硝処理させる場合に
おいて、」―定日的を達成すべく、特に次のようにする
ことを提案するものである。(Another Means to Solve the Problems) The present invention aims to remove nitrogen oxide-containing exhaust gas by injecting ammonia gas into the exhaust gas containing nitrogen oxides in a denitrification treatment area in the exhaust gas exhaust path led from the engine or gas turbine. In the case of performing selective reduction denitrification treatment in the presence of a catalyst, we particularly propose the following procedure in order to achieve regular denitrification.
すなわち、第１の発明では、排気ガス中の酸化物濃度を
検出して、これに基づいてアンモニアガス注入量を制御
させ、この状態において排気ガス排出経路における脱硝
処理領域の下流側で排気ガス中のリークアンモニア濃度
を検出して、これが設定濃度を超えた場合においてのみ
、前記窒素酸化物濃度に基づくアンモニアガス注入量制
御に優先して、リークアンモニア濃度に基づいてこれが
前記設定濃度以下となるようにアンモニアガス注入量を
制限制御させるのである。That is, in the first invention, the oxide concentration in the exhaust gas is detected, the ammonia gas injection amount is controlled based on this, and in this state, the oxide concentration in the exhaust gas is detects the leak ammonia concentration, and only when the leak ammonia concentration exceeds the set concentration, takes priority over ammonia gas injection amount control based on the nitrogen oxide concentration, and controls the leak ammonia concentration so that the leak ammonia concentration becomes equal to or lower than the set concentration. The amount of ammonia gas injected is controlled to be limited.
また第２の発明では、排気ガス中の窒素酸化物濃度を検
出して、これに基づいてアンモニアガス注入量を制御さ
せ、この状態において排気ガス排出経路における脱硝処
理領域の下流側で排気ガス中のリークアンモニア濃度を
検出して、これが設定濃度を超え且つその状態が一定時
間継続した場合においてのみ、排気ガスを脱硝処理領域
の上流側で排気ガス排出経路に分岐接続した脱硝処理領
域迂回経路にバイパスさせると共に、脱硝処理領域に触
媒清掃用の加圧流体を所定時間吹き込むようにするので
ある。Further, in the second invention, the nitrogen oxide concentration in the exhaust gas is detected, the ammonia gas injection amount is controlled based on this, and in this state, the nitrogen oxide concentration in the exhaust gas is The leak ammonia concentration in the denitrification treatment area is detected, and only when this exceeds the set concentration and this condition continues for a certain period of time, the exhaust gas is diverted to the denitrification treatment area bypass route that is branched and connected to the exhaust gas exhaust route on the upstream side of the denitrification treatment area. At the same time, a pressurized fluid for cleaning the catalyst is blown into the denitrification processing area for a predetermined period of time.
さらに、第３の発明は第１の発明と第２の発明とを組合
せたもので、この第３の発明では、排気ガス中の窒素酸
化物濃度を検出して、これに基づいてアンモニアガス注
入量を制御させ、この状態において排気ガス排出経路に
おける脱硝処理領域の下流側で排気ガス中のリークアン
モニア濃度を検出して、これが設定濃度を超えた場合に
おいてのみ、前記窒素酸化物濃度に基づくアンモニアガ
ス注入量制御に優先して、リークアンモニア濃度い基づ
いてこれが前記設定濃度以下となるようにアンモニアガ
ス注入量を制限制御させると共に、リークアンモニア濃
度が油記設定濃度を超え旧つその状態が一定時間継続し
た場合には、排気ガスを脱硝処理領域の」−流側で排気
ガス排出経路に分岐接続した脱硝処理領域迂回経路しこ
バイパスさせ且つ脱硝処理領域に触媒清掃用の加圧流体
を所定時間吹き込むようにするのである。Furthermore, the third invention is a combination of the first invention and the second invention, and in this third invention, the nitrogen oxide concentration in the exhaust gas is detected and the ammonia gas is injected based on this. In this state, the leak ammonia concentration in the exhaust gas is detected on the downstream side of the denitrification processing area in the exhaust gas exhaust path, and only when the leak ammonia concentration exceeds the set concentration, the ammonia concentration based on the nitrogen oxide concentration is detected. Priority is given to gas injection amount control, and the ammonia gas injection amount is limited and controlled based on the leak ammonia concentration so that it is below the set concentration, and the leak ammonia concentration exceeds the oil setting concentration and the state remains constant. If the process continues for a certain period of time, the exhaust gas is diverted to the denitrification treatment area bypass route that is branched and connected to the exhaust gas discharge path on the upstream side of the denitrification treatment area, and the pressurized fluid for catalyst cleaning is supplied to the denitrification treatment area as specified. Let's make time for it.
（作用）
第１の発明によれば、通常時はアンモニアガス注入量が
排気ガス中の窒素酸化物濃度に応じて制御される。つま
り、アンモニアガス注入量が、脱硝率又は脱硝処理領域
の下流側の窒素酸化物濃度が設定範囲内となるように、
制御される。(Operation) According to the first invention, the amount of ammonia gas injected is normally controlled according to the nitrogen oxide concentration in the exhaust gas. In other words, the ammonia gas injection amount is adjusted so that the denitrification rate or the nitrogen oxide concentration on the downstream side of the denitrification treatment area is within the set range.
controlled.
そして、必要とする脱硝率が高くなったり、触媒表面へ
の煤塵付着又は触媒の劣化等によって、検出されたリー
クアンモニア濃度が設定濃度を超えるようになると、前
記窒素酸化物濃度に基づくアンモニアガス注入量制御に
優先して、リークアンモニア濃度が前記設定濃度以下と
なるようにアンモニアガス注入量が制限制御される。し
たがって、多量のリークアンモニアの発生は未然に防止
され、こ才りに起因する問題は全く生じない。なお、検
出されるリークアンモニア濃度が設定濃度以下となると
、再び窒素酸化物濃度に基づいてアンモニアガス注入量
が制御される。When the detected leak ammonia concentration exceeds the set concentration due to the required denitrification rate becoming high, dust adhesion to the catalyst surface, catalyst deterioration, etc., ammonia gas is injected based on the nitrogen oxide concentration. Priority is given to the amount control, and the amount of ammonia gas injected is controlled to be limited so that the leak ammonia concentration is equal to or less than the set concentration. Therefore, generation of a large amount of leaked ammonia is prevented, and no problems arise due to this omission. Note that when the detected leak ammonia concentration becomes equal to or lower than the set concentration, the ammonia gas injection amount is controlled again based on the nitrogen oxide concentration.
また第２の発明によれば、通常時は、第１の発明におけ
ると同様にアンモニアガス注入量が排気ガス中の窒素酸
化物濃度に応じて制御されるが、触媒表面への煤塵付着
によって、検出されたリークアンモニア濃度が設定濃度
を超え１１つその状態が一定時間継続するようになると
、排気ガスが脱硝処理領域の」１流側で排気ガス排出経
路に分岐接続した脱硝処理領域迂回経路にバイパスされ
ると共に、脱硝処理領域に触媒清掃用の加圧流体が所定
時間吹き込まれる。Further, according to the second invention, in normal times, the amount of ammonia gas injection is controlled according to the concentration of nitrogen oxides in the exhaust gas, as in the first invention, but due to soot and dust adhering to the catalyst surface, When the detected leak ammonia concentration exceeds the set concentration and this state continues for a certain period of time, the exhaust gas is diverted to the denitrification treatment area detour route that is branched and connected to the exhaust gas exhaust route on the first stream side of the denitrification treatment area. At the same time, pressurized fluid for catalyst cleaning is blown into the denitrification processing area for a predetermined period of time.
したがって、触媒表面に付着した煤塵はこの加圧流体の
吹き付けによって除去され、触媒機能が回復されること
になるから、爾後前記窒素酸化物濃度に基づくアンモニ
アガス注入量制御が再開されたときには、必要量以上の
アンモニアガスが注入されるようなことがなく、多量の
リークアンモニアが発生する虞れは皆無となる。Therefore, the dust adhering to the catalyst surface is removed by spraying this pressurized fluid and the catalyst function is restored, so that when the ammonia gas injection amount control based on the nitrogen oxide concentration is resumed, the necessary There is no possibility that more ammonia gas will be injected than the specified amount, and there is no possibility that a large amount of leaked ammonia will occur.
さらに第３の発明によれば、」−記した第１の発明及び
第２の発明による作用が共に行われる。すなわち、通常
時は、第１の発明及び第２の発明におけると同様にアン
モニアガス注入量が排気ガス中の窒素酸化物濃度に応じ
て制御されるが、検出されたリークアンモニア濃度が設
定濃度を超えるようになると、前記窒素酸化物濃度に基
づくアンモニアガス注入量制御に優先して、リークアン
モニア濃度が前記設定濃度以下となるようにアンモニア
ガス注入量が制限制御され、また脱硝率又は脱硝処理領
域下流側の窒素酸化物濃度が正常つまり所定の設定範囲
にあるにも拘らず、リークアンモニア濃度が市記設定濃
度を超え且つその状態が一定時間継続するようになると
、排気ガスが脱硝処理領域の」１流側で排気ガス排出経
路に分岐接続した脱硝処理領域迂回経路にバイパスされ
ると共に、脱硝処理領域に触媒清掃用の加圧流体が所定
時間吹き込まれて、触媒が自動的に清掃されるの〜 １
１−
である。Furthermore, according to the third invention, the effects of the first invention and the second invention described above are performed together. That is, in normal times, the ammonia gas injection amount is controlled according to the nitrogen oxide concentration in the exhaust gas as in the first invention and the second invention, but the detected leak ammonia concentration exceeds the set concentration. If the concentration exceeds the set concentration, the ammonia gas injection amount is controlled to be limited so that the leak ammonia concentration is less than or equal to the set concentration, and the ammonia gas injection amount is controlled in priority to the ammonia gas injection amount control based on the nitrogen oxide concentration, and the denitrification rate or denitrification treatment area is Even though the nitrogen oxide concentration on the downstream side is normal, that is, within the predetermined setting range, if the leak ammonia concentration exceeds the city-reported setting concentration and this state continues for a certain period of time, the exhaust gas will be removed from the denitrification treatment area. "On the first stream side, the denitrification processing area is bypassed to the denitrification processing area branch connection connected to the exhaust gas discharge path, and pressurized fluid for catalyst cleaning is blown into the denitration processing area for a predetermined period of time, and the catalyst is automatically cleaned. ~1
1-.
（実施例）
以十、本発明を第１図に示す実施例に基づいて具体的に
説明する。(Example) Hereinafter, the present invention will be specifically explained based on an example shown in FIG.
第１図は本発明を実施するためのシステムの一例を示し
た系統図であり、第１図において、１はディーゼルエン
ジン、ガスエンジン等のエンジン又はガスタービン（以
下、「エンジン」と総称する）であり、２はアンモニア
ガス貯溜装置３からアンモニアガス注入管路４を導いた
アンモニアガス混合器で、アンモニアガス注入管路４に
は減圧弁５及び流量調整弁６が介装されており、７は適
宜の触媒を内装した触媒塔であり、８は排気ガスの熱を
回収する排熱回収装置である。FIG. 1 is a system diagram showing an example of a system for implementing the present invention. In FIG. 1, 1 is an engine such as a diesel engine or a gas engine, or a gas turbine (hereinafter collectively referred to as "engine"). 2 is an ammonia gas mixer that leads an ammonia gas injection pipe 4 from an ammonia gas storage device 3, and the ammonia gas injection pipe 4 is interposed with a pressure reducing valve 5 and a flow rate regulating valve 6; 8 is a catalyst tower equipped with a suitable catalyst, and 8 is an exhaust heat recovery device for recovering heat from exhaust gas.
９はエンジン１から順次混合器２．触媒塔７゜排熱回収
装置８を経て煙突１０に至る排気ガス排出経路たる排出
管路である。この排出管路９には、混合器２の」−流側
における窒素酸化物濃度を検出する第１窒素酸化物濃度
検出器１］−５触媒塔７の下流側における窒素酸化物濃
度を検出する第２窒素酸化物濃度検出器１２及び触媒塔
７の下流側におけるリークアンモニア濃度を検出するリ
ークアンモニア濃度検出器１３が夫々設けられている。9 sequentially from engine 1 to mixer 2. This is an exhaust pipe line that is an exhaust gas exhaust route from the catalyst tower 7° to the chimney 10 via the exhaust heat recovery device 8. This discharge pipe 9 includes a first nitrogen oxide concentration detector 1]-5 for detecting the concentration of nitrogen oxides on the downstream side of the mixer 2. A second nitrogen oxide concentration detector 12 and a leak ammonia concentration detector 13 for detecting the leak ammonia concentration on the downstream side of the catalyst tower 7 are provided, respectively.
さらに排出管路９には、混合器２の上流側近傍部位と触
媒塔７の下流側近傍部位とを連通ずる脱硝処理領域迂回
管路］４が分岐接続されており、両管路９．］４のヒ流
側連結部分には夫々第１．第２開閉ダンパ９ａ、１４ａ
が配設されている。Furthermore, a denitrification treatment area detour pipe] 4 that communicates a portion near the upstream side of the mixer 2 with a portion near the downstream side of the catalyst tower 7 is branched and connected to the discharge pipe 9. ] 4 on the flow side connecting portion, respectively. Second opening/closing damper 9a, 14a
is installed.
１５は自動触媒清掃装置で、スートブロア源１６から触
媒塔７内に加圧流体供給管路１７を導いてあり、該管路
に介設した自動弁１８を制御することによって、圧縮空
気、高圧蒸気等の触媒清掃用の加圧流体を管路１７先端
のスートブロア１７ａから触媒塔７内に吹き込むように
なされている。Reference numeral 15 denotes an automatic catalyst cleaning device, in which a pressurized fluid supply pipe 17 is guided from a soot blower source 16 into the catalyst tower 7, and by controlling an automatic valve 18 installed in the pipe, compressed air and high pressure steam are supplied. A pressurized fluid for cleaning the catalyst is blown into the catalyst tower 7 from a soot blower 17a at the tip of the pipe line 17.
１９は各検出器１１，１２，１．３による検出値に基づ
いて流量調整弁６．ダンパ９ａ、１４ａ及び自動弁１８
を制御する制御装置である。19 is a flow rate regulating valve 6. based on the detected value by each detector 11, 12, 1.3. Dampers 9a, 14a and automatic valve 18
This is a control device that controls the
この実施例では、注入管路４から混合器２内にアンモニ
アガスを注入させると共に、エンジン１から排出された
排気ガスを、混合器２．触媒塔７゜排熱回収装置８を経
て煙突１−ｏから大気中に放出させるることによって、
排気ガスを排出管路９における脱硝処理領域内で脱硝処
理させる。つまり、排気ガスは、混合器２内においてア
ンモニアガスとを混合された」二、触媒塔７内でつまり
触媒下でアンモニアによって選択還元脱硝処理されるの
である。In this embodiment, ammonia gas is injected into the mixer 2 from the injection pipe 4, and exhaust gas discharged from the engine 1 is injected into the mixer 2. By discharging into the atmosphere from the chimney 1-o through the catalyst tower 7 and the exhaust heat recovery device 8,
The exhaust gas is subjected to denitrification treatment within the denitrification treatment area in the exhaust pipe 9. That is, the exhaust gas is mixed with ammonia gas in the mixer 2, and then subjected to selective reduction and denitration treatment using ammonia in the catalyst tower 7, that is, under the catalyst.
このとぎ、制御装置１９により、流量調整弁６、ダンパ
９ａ、１４ａ及び自動弁１８を各検出器１１、、１．２
．１−３による検出値に基づいて次のように制御させる
。At this point, the control device 19 controls the flow rate adjustment valve 6, the dampers 9a, 14a, and the automatic valve 18 to the respective detectors 11, 1.2.
．． Control is performed as follows based on the detected value by 1-3.
すなわち、通常時は、第１ダンパ９ａを開に且つ第２ダ
ンパ１４ａを閉に制御すると共に、第１゜第２窒素酸化
物濃度検出器１１．１２によって検出された脱硝処理領
域の上下流側における窒素酸化物濃度を比較して、所定
の脱硝率となるようにアンモニアガス注入量を制御する
。なお、窒素酸化物濃度検出器として第２窒素酸化物濃
度検出器１２のみを設ける場合には、制御装置１９によ
り、検出器］−２による検出値と予め設定した設定値と
を比較して、その偏差が零となるようにアンモニアガス
注入量を制御するようにしておく。That is, in normal times, the first damper 9a is controlled to be open and the second damper 14a is controlled to be closed. The ammonia gas injection amount is controlled to achieve a predetermined denitrification rate by comparing the nitrogen oxide concentrations at Note that when only the second nitrogen oxide concentration detector 12 is provided as the nitrogen oxide concentration detector, the control device 19 compares the detected value by the detector]-2 with a preset setting value, The amount of ammonia gas injected is controlled so that the deviation becomes zero.
そして、リークアンモニア濃度検出器１：３による検出
濃度が予め設定した設定濃度（例えば５ｐｐｍ程度）を
超えると、上記した窒素酸化物濃度に基づくアンモニア
ガス注入量制御に優先して、アンモニアガス注入量をリ
ークアンモニア濃度検出器１３による検出濃度に基づい
て制御する。つまり、脱硝率に拘らず、リークアンモニ
ア濃度が前記設定濃度以下となるようにアンモニアガス
注入量を制限制御する。なお、検出されるリークアンモ
ニア濃度が設定濃度以下となると、リークアンモニア濃
度に基づくアンモニアガス注入量制御を解除して、窒素
酸化物濃度しこ基づくアンモニアガス注入量制御を再開
させる。When the concentration detected by the leak ammonia concentration detector 1:3 exceeds a preset concentration (for example, about 5 ppm), the ammonia gas injection amount is prioritized over the ammonia gas injection amount control based on the nitrogen oxide concentration described above. is controlled based on the concentration detected by the leak ammonia concentration detector 13. That is, regardless of the denitrification rate, the amount of ammonia gas injected is controlled to be limited so that the leak ammonia concentration is equal to or less than the set concentration. Note that when the detected leak ammonia concentration becomes equal to or lower than the set concentration, the ammonia gas injection amount control based on the leak ammonia concentration is canceled and the ammonia gas injection amount control based on the nitrogen oxide concentration is restarted.
また、脱硝率（」−記した如く第１窒素酸化物濃度検出
器１１を設けない場合にあっては、触媒塔７の下流側に
おける窒素酸化物濃度）が正常値をとなっているにも拘
らず、リークアンモニア濃度が設定濃度を超えており且
つその状態が一定時間継続するときには、この継続時間
経過後、制御装置１９により、第２ダンパ］−４８を開
制御すると共に第１ダンパ９ａを閉制御して、排気ガス
を脱硝処理領域迂回管路１４に導き、脱硝処理領域を経
過させることなく煙突１０から放出させると共に、自動
弁１８を開制御して、加圧流体を触媒塔７内に吹き込ま
せる。つまり、触媒塔７内の触媒表面に付着した煤塵等
を加圧流体の噴射作用によって除去し、煤塵等の付着に
よって低下、劣化した触媒機能を回復させるのである。Furthermore, even if the denitrification rate (in the case where the first nitrogen oxide concentration detector 11 is not provided as described above, the nitrogen oxide concentration on the downstream side of the catalyst tower 7) is at a normal value. Regardless, if the leak ammonia concentration exceeds the set concentration and this state continues for a certain period of time, after the elapse of this period of time, the control device 19 controls the opening of the second damper]-48 and also opens the first damper 9a. The automatic valve 18 is controlled to close, and the exhaust gas is guided to the denitrification treatment area detour pipe 14 and released from the chimney 10 without passing through the denitrification treatment area. Let it blow into the air. In other words, the soot and dust adhering to the surface of the catalyst in the catalyst tower 7 are removed by the injection action of the pressurized fluid, and the catalytic function which has been reduced or deteriorated due to the adhesion of the soot and dust is restored.
なお、かかる触媒の清掃処理は所定時間待われ、該処理
が終Ｙすると、制御装置１９により、」１記したアンモ
ニアガス注入量制御が再開される。Note that the catalyst cleaning process is waited for a predetermined time, and when the process is completed, the control device 19 restarts the ammonia gas injection amount control described in "1".
ところで、前記実施例においては、リークアンモニア濃
度が設定濃度を超えた場合、リークアンモニア濃度に基
づくアンモニアガス注入量制御及び触媒清掃制御を行わ
しめるようにしたが、何れか一方の制御のみ行わしめる
ようにしても良い。Incidentally, in the above embodiment, when the leak ammonia concentration exceeds the set concentration, the ammonia gas injection amount control and the catalyst cleaning control are performed based on the leak ammonia concentration, but it is not possible to perform only one of the controls. You can also do it.
また、触媒の清掃を人為的に行いつる場合には、上記の
如き触媒の自動清掃を行わしめることなく、制御装置１
９により、リークアンモニア濃度が設定濃度を超え沫つ
その状態が一定時間継続した場合に警報等を発して、清
掃時期を知らしめるようにしておくだけでも良い。勿論
、自動清掃を行わしめる場合においても、かかる警報等
が発せられるようにしておいても良い。In addition, if the catalyst is to be cleaned manually, the control device
9, if the leak ammonia concentration exceeds the set concentration and this state continues for a certain period of time, an alarm or the like may be issued to inform the user that it is time for cleaning. Of course, even when automatic cleaning is performed, such a warning may be issued.
（発明の効果）
以−Ｌの説明から容易に理解されるように、本発明の脱
硝処理方法によれば、排気ガス中の窒素酸化物濃度のみ
ならずリークアンモニア濃度をも監視しながら排気ガス
を脱硝処理させるから、多量のリークアンモニアの発生
を未然に防Ｉトすることができ、大気中に多量のアンモ
ニアガスを放出するといった公害問題や脱硝処理領域の
１；流側に設けたｔ熱回収装置に悪影響を及ぼす等の不
都合を生じることなく、排気ガスの脱硝処理を良好に行
うことができる。しかも−第２の発明又は第３の発明に
よる如く、触媒を自動清掃させるようにすれば、煤塵を
多量に含む排気ガスをも効果的に脱硝処理することがで
きる。(Effects of the Invention) As can be easily understood from the explanation below, according to the denitrification treatment method of the present invention, the exhaust gas is treated while monitoring not only the concentration of nitrogen oxides in the exhaust gas but also the concentration of leaked ammonia. Since the gas is denitrified, it is possible to prevent the generation of a large amount of leaked ammonia, and to prevent pollution problems such as releasing a large amount of ammonia gas into the atmosphere. Denitration processing of exhaust gas can be performed satisfactorily without causing any inconvenience such as adversely affecting the recovery device. Moreover, if the catalyst is automatically cleaned as in the second or third invention, even exhaust gas containing a large amount of soot and dust can be effectively denitrated.
第１図は本発明を実施するためのシステムの一例を示す
系統図であり、第２図は従来技術を示す系統図であり、
第３図は排気ガスの脱硝処理におけるアンモニアガス注
入量と脱硝率及びリークアンモニア濃度との関係を示す
グラフである。
１・・・エンジン又はガスタービン、２・・・アンモニ
アガス混合器、３・・・アンモニアガス１１？溜装置、
４・・・アンモニアガス注入管路、６・・・濃酸調整弁
、７・・・触媒塔、８・・・排熱回収装置、９・・・排
気ガスの排出管路（排気ガス排出経路）、９ａ、１４ａ
・・・開閉ダンパ、１０・・・煙突、１１．１２・・・
窒素酸化物濃度検出器、１：３・・・リークアンモニア
濃度検出器、１４・・・脱硝処理領域迂回管路（脱硝処
理領域迂回経路）、１５・・・自動触媒清掃装置、１６
・・・スー１〜ブロア源、Ｉ７・・・加圧流体供給管路
、１７ａ・・・スー１〜ブロア、ｊ８・・・自動弁、１
９・・・制御装置。FIG. 1 is a system diagram showing an example of a system for implementing the present invention, and FIG. 2 is a system diagram showing a conventional technology.
FIG. 3 is a graph showing the relationship between the amount of ammonia gas injected, the denitrification rate, and the leak ammonia concentration in exhaust gas denitrification treatment. 1...Engine or gas turbine, 2...Ammonia gas mixer, 3...Ammonia gas 11? reservoir device,
4... Ammonia gas injection pipe, 6... Concentrated acid regulating valve, 7... Catalyst tower, 8... Exhaust heat recovery device, 9... Exhaust gas discharge pipe (exhaust gas discharge route) ), 9a, 14a
... Opening/closing damper, 10... Chimney, 11.12...
Nitrogen oxide concentration detector, 1:3... Leak ammonia concentration detector, 14... Denitration processing area detour pipe (Denitration processing area bypass route), 15... Automatic catalyst cleaning device, 16
... Sue 1 - Blower source, I7... Pressurized fluid supply pipe line, 17a... Sue 1 - Blower, j8... Automatic valve, 1
9...Control device.
Claims (3)
出経路における脱硝処理領域内で、窒素酸化物含有の排
気ガスを、これにアンモニアガスを注入することによっ
て、触媒の存在下で選択還元脱硝処理させる方法におい
て、排気ガス中の窒素酸化物濃度を検出して、これに基
づいてアンモニアガス注入量を制御させ、この状態にお
いて排気ガス排出経路における脱硝処理領域の下流側で
排気ガス中のリークアンモニア濃度を検出して、これが
設定濃度を超えた場合においてのみ、前記窒素酸化物濃
度に基づくアンモニアガス注入量制御に優先して、リー
クアンモニア濃度に基づいてこれが前記設定濃度以下と
なるようにアンモニアガス注入量を制限制御させること
を特徴とする排気ガスの脱硝処理方法。(1) Exhaust gas containing nitrogen oxides is subjected to selective reduction denitrification treatment in the presence of a catalyst by injecting ammonia gas into the denitrification treatment area in the exhaust gas exhaust path led from the engine or gas turbine. In this method, the nitrogen oxide concentration in the exhaust gas is detected and the ammonia gas injection amount is controlled based on this, and in this state, the leak ammonia concentration in the exhaust gas is reduced downstream of the denitrification treatment area in the exhaust gas exhaust path. is detected, and only when this exceeds the set concentration, ammonia gas is injected based on the leaked ammonia concentration so that the ammonia gas injection amount is below the set concentration based on the leak ammonia concentration, giving priority to ammonia gas injection amount control based on the nitrogen oxide concentration. A method for denitrification treatment of exhaust gas, characterized by restricting and controlling the amount.
出経路における脱硝処理領域内で、窒素酸化物含有の排
気ガスを、これにアンモニアガスを注入することによっ
て、触媒の存在下で選択還元脱硝処理させる方法におい
て、排気ガス中の窒素酸化物濃度を検出して、これに基
づいてアンモニアガス注入量を制御させ、この状態にお
いて排気ガス排出経路における脱硝処理領域の下流側で
排気ガス中のリークアンモニア濃度を検出して、これが
設定濃度を超え且つその状態が一定時間継続した場合に
おいてのみ、排気ガスを脱硝処理領域の上流側で排気ガ
ス排出経路に分岐接続した脱硝処理領域迂回経路にバイ
パスさせると共に、脱硝処理領域に触媒清掃用の加圧流
体を所定時間吹き込むようにしたことを特徴とする排気
ガスの脱硝処理方法。(2) Exhaust gas containing nitrogen oxides is subjected to selective reduction denitrification treatment in the presence of a catalyst by injecting ammonia gas into the denitrification treatment area in the exhaust gas exhaust path led from the engine or gas turbine. In this method, the nitrogen oxide concentration in the exhaust gas is detected and the ammonia gas injection amount is controlled based on this, and in this state, the leak ammonia concentration in the exhaust gas is reduced downstream of the denitrification treatment area in the exhaust gas exhaust path. is detected, and only when this exceeds a set concentration and this state continues for a certain period of time, the exhaust gas is bypassed to a denitrification treatment area detour route that is branched and connected to the exhaust gas discharge route on the upstream side of the denitrification treatment area, and A method for denitrating exhaust gas, characterized in that a pressurized fluid for catalyst cleaning is blown into a denitrification treatment area for a predetermined period of time.
出経路における脱硝処理領域内で、窒素酸化物含有の排
気ガスを、これにアンモニアガスを注入することによっ
て、触媒の存在下で選択還元脱硝処理させる方法におい
て、排気ガス中の窒素酸化物濃度を検出して、これに基
づいてアンモニアガス注入量を制御させ、この状態にお
いて排気ガス排出経路における脱硝処理領域の下流側で
排気ガス中のリークアンモニア濃度を検出して、これが
設定濃度を超えた場合においてのみ、前記窒素酸化物濃
度に基づくアンモニアガス注入量制御に優先して、リー
クアンモニア濃度に基づいてこれが前記設定濃度以下と
なるようにアンモニアガス注入量を制限制御させると共
に、リークアンモニア濃度が前記設定濃度を超え且つそ
の状態が一定時間継続した場合には、排気ガスを脱硝処
理領域の上流側で排気ガス排出経路に分岐接続した脱硝
処理領域迂回経路にバイパスさせ且つ脱硝処理領域に触
媒清掃用の加圧流体を所定時間吹き込むようにしたこと
を特徴とする排気ガスの脱硝処理方法。(3) Exhaust gas containing nitrogen oxides is subjected to selective reduction denitrification treatment in the presence of a catalyst by injecting ammonia gas into the denitrification treatment area in the exhaust gas exhaust path led from the engine or gas turbine. In this method, the nitrogen oxide concentration in the exhaust gas is detected and the ammonia gas injection amount is controlled based on this, and in this state, the leak ammonia concentration in the exhaust gas is reduced downstream of the denitrification treatment area in the exhaust gas exhaust path. is detected, and only when this exceeds the set concentration, ammonia gas is injected based on the leaked ammonia concentration so that the ammonia gas injection amount is below the set concentration based on the leak ammonia concentration, giving priority to ammonia gas injection amount control based on the nitrogen oxide concentration. In addition to restricting the amount, if the leak ammonia concentration exceeds the set concentration and this state continues for a certain period of time, the exhaust gas is diverted to the denitrification processing area by branching and connecting to the exhaust gas exhaust path on the upstream side of the denitrification processing area. 1. A method for denitration treatment of exhaust gas, characterized in that a pressurized fluid for catalyst cleaning is blown into a denitration treatment region for a predetermined period of time while bypassing the passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61188881A JPS6344925A (en) | 1986-08-12 | 1986-08-12 | Denitration treatment of exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61188881A JPS6344925A (en) | 1986-08-12 | 1986-08-12 | Denitration treatment of exhaust gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6344925A true JPS6344925A (en) | 1988-02-25 |
| JPH0365214B2 JPH0365214B2 (en) | 1991-10-11 |
Family
ID=16231513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61188881A Granted JPS6344925A (en) | 1986-08-12 | 1986-08-12 | Denitration treatment of exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6344925A (en) |
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| JP2013046885A (en) * | 2011-08-29 | 2013-03-07 | Takuma Co Ltd | System and method for treating exhaust gas |
| JP2013132566A (en) * | 2011-12-26 | 2013-07-08 | Hitachi Zosen Corp | Reducing agent supply method and reducing agent supply device for incinerator |
| JP2014062549A (en) * | 2013-11-13 | 2014-04-10 | Yanmar Co Ltd | Shipboard exhaust gas purification device |
| JP2014205582A (en) * | 2013-04-10 | 2014-10-30 | 株式会社Ihi | Reformer |
| JP2015086880A (en) * | 2013-10-31 | 2015-05-07 | マン・ディーゼル・アンド・ターボ | Combustion engine system |
| JP2017115896A (en) * | 2017-03-17 | 2017-06-29 | ヤンマー株式会社 | Ship installed exhaust emission control system |
| JP2017187034A (en) * | 2016-03-31 | 2017-10-12 | マン・ディーゼル・アンド・ターボ・エスイー | Exhaust gas post-treatment system and internal combustion engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4079414B2 (en) * | 2002-04-03 | 2008-04-23 | 三菱重工業株式会社 | Nitrogen oxide processing apparatus and nitrogen oxide processing method |
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|---|---|---|---|---|
| JPS5140371A (en) * | 1974-10-04 | 1976-04-05 | Mitsubishi Heavy Ind Ltd | Haigasuchuno nox no nh3 setsushokukangenhoniokeru nh3 chunyuryoseigyohoho |
| JPS51111496A (en) * | 1975-03-26 | 1976-10-01 | Kobe Steel Ltd | Method of removing the deposited dust |
| JPS51137176A (en) * | 1975-05-22 | 1976-11-26 | Nippon Steel Corp | Method of removing dust from exhaust gas containing dust |
| JPS53132469A (en) * | 1977-04-25 | 1978-11-18 | Mitsui Eng & Shipbuild Co Ltd | Dry denitrating apparatus using reducing method with ammonia |
| JPS54132467A (en) * | 1978-04-06 | 1979-10-15 | Jgc Corp | Automatically operating method for catalyst- regeneration process in exhaust gas denitration process |
-
1986
- 1986-08-12 JP JP61188881A patent/JPS6344925A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140371A (en) * | 1974-10-04 | 1976-04-05 | Mitsubishi Heavy Ind Ltd | Haigasuchuno nox no nh3 setsushokukangenhoniokeru nh3 chunyuryoseigyohoho |
| JPS51111496A (en) * | 1975-03-26 | 1976-10-01 | Kobe Steel Ltd | Method of removing the deposited dust |
| JPS51137176A (en) * | 1975-05-22 | 1976-11-26 | Nippon Steel Corp | Method of removing dust from exhaust gas containing dust |
| JPS53132469A (en) * | 1977-04-25 | 1978-11-18 | Mitsui Eng & Shipbuild Co Ltd | Dry denitrating apparatus using reducing method with ammonia |
| JPS54132467A (en) * | 1978-04-06 | 1979-10-15 | Jgc Corp | Automatically operating method for catalyst- regeneration process in exhaust gas denitration process |
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|---|---|---|---|---|
| JP2013046885A (en) * | 2011-08-29 | 2013-03-07 | Takuma Co Ltd | System and method for treating exhaust gas |
| JP2013132566A (en) * | 2011-12-26 | 2013-07-08 | Hitachi Zosen Corp | Reducing agent supply method and reducing agent supply device for incinerator |
| JP2013015149A (en) * | 2012-10-25 | 2013-01-24 | Yanmar Co Ltd | Exhaust gas purifier for mounting in ship |
| JP2013032777A (en) * | 2012-10-25 | 2013-02-14 | Yanmar Co Ltd | Exhaust gas purifying apparatus to be mounted in ship |
| JP2014205582A (en) * | 2013-04-10 | 2014-10-30 | 株式会社Ihi | Reformer |
| JP2015086880A (en) * | 2013-10-31 | 2015-05-07 | マン・ディーゼル・アンド・ターボ | Combustion engine system |
| JP2014062549A (en) * | 2013-11-13 | 2014-04-10 | Yanmar Co Ltd | Shipboard exhaust gas purification device |
| JP2017187034A (en) * | 2016-03-31 | 2017-10-12 | マン・ディーゼル・アンド・ターボ・エスイー | Exhaust gas post-treatment system and internal combustion engine |
| CN107269356A (en) * | 2016-03-31 | 2017-10-20 | 曼柴油机和涡轮机欧洲股份公司 | Exhaust after treatment system and internal combustion engine |
| JP2017115896A (en) * | 2017-03-17 | 2017-06-29 | ヤンマー株式会社 | Ship installed exhaust emission control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365214B2 (en) | 1991-10-11 |
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