JPH0352626A - Waste combustion gas treating device and regerating method thereof - Google Patents
Waste combustion gas treating device and regerating method thereofInfo
- Publication number
- JPH0352626A JPH0352626A JP1188584A JP18858489A JPH0352626A JP H0352626 A JPH0352626 A JP H0352626A JP 1188584 A JP1188584 A JP 1188584A JP 18858489 A JP18858489 A JP 18858489A JP H0352626 A JPH0352626 A JP H0352626A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- flue
- denitrification
- exhaust gas
- combustion exhaust
- 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
- 238000000034 method Methods 0.000 title claims description 8
- 239000000567 combustion gas Substances 0.000 title description 3
- 239000002699 waste material Substances 0.000 title 1
- 239000003054 catalyst Substances 0.000 claims abstract description 76
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 46
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000003647 oxidation Effects 0.000 claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 24
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003546 flue gas Substances 0.000 claims abstract description 5
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 68
- 238000002485 combustion reaction Methods 0.000 claims description 21
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 20
- 239000010948 rhodium Substances 0.000 claims description 12
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 239000004480 active ingredient Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 abstract description 5
- 230000008021 deposition Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000003057 platinum Chemical class 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- 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〕
本発明は燃焼排ガス処理装置およびその再生方法に係り
、特に酸化触媒の下流に脱硝触媒を設置した燃焼排ガス
処理装置およびその再生方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion exhaust gas treatment device and a method for regenerating the same, and more particularly to a combustion exhaust gas treatment device in which a denitrification catalyst is installed downstream of an oxidation catalyst and a method for regenerating the same.
（従来の技術）
ボイラなどの燃焼炉からの燃焼排ガスやガスタービンか
らの燃焼排ガス中には、ＣＯなとの未燃分とともにＮｏ
，ＮＯ．など（以下、ＮＯｘという）の窒素酸化物が含
有され、そのまま排出すれば大気汚染などの問題を発生
する場合がある。このような場合は未燃分を燃焼させる
ための酸化触媒装置と、窒素酸化物除去用触媒（以下、
脱硝触媒という）を有する脱硝装置の両方を燃焼排ガス
ダクト内に設置してＣＯやＮＯｘを除去することが行わ
れている。(Prior art) Combustion exhaust gas from combustion furnaces such as boilers and combustion exhaust gas from gas turbines contains unburned substances such as CO and NO.
, NO. (hereinafter referred to as NOx), which may cause problems such as air pollution if discharged as is. In such cases, an oxidation catalyst device for burning unburned substances and a catalyst for removing nitrogen oxides (hereinafter referred to as
A denitrification device including a denitrification catalyst (also called a denitrification catalyst) is installed in a combustion exhaust gas duct to remove CO and NOx.
上記した酸化触媒としては白金、パラジウム、ロジウム
などが主として使用され、脱硝触媒としてはＴｉ，Ｖ，
Ｍｏ，Ｗ，Ｆｅ，Ｎｉ，Ｓｎなどの金属酸化物の１種以
上が使用され、還元剤としてＮＨ．を使い、ＮＯｘを還
元してＮ２とＨ，０を生しさせることが行われている。Platinum, palladium, rhodium, etc. are mainly used as the above-mentioned oxidation catalyst, and Ti, V,
One or more metal oxides such as Mo, W, Fe, Ni, Sn are used, and NH. is being used to reduce NOx to produce N2 and H,0.
ところで、酸化触媒としての白金やパラジウム、ロジウ
ムなどは、Ｎ Ｈ ３、と０２を反応させてＮＯｘにす
る性質がある。したがって、酸化触媒を脱硝装置の後流
に設けると、脱硝装置から流出した未反応のＮＨ，を酸
化してＮＯｘにしてしまうことになる。一般に脱硝装置
では排ガス中のＮＯｘに対して当量以上のＮＨ，を使用
するので、多少のリークＮＨ，が流出する場合が多い。By the way, platinum, palladium, rhodium, and the like as oxidation catalysts have the property of reacting NH3 and 02 to form NOx. Therefore, if an oxidation catalyst is provided downstream of the denitrification device, unreacted NH flowing out from the denitrification device will be oxidized to NOx. Generally, in a denitrification device, NH is used in an amount equal to or more than the NOx in the exhaust gas, so a certain amount of NH often leaks out.
そこで、酸化触媒と脱硝触媒の両方を設置する場合は、
酸化触媒を上流側に、脱硝触媒を下流側に設置するのが
合理的である。こうしておけば、排ガス温度が低い（例
えば２５０゜Ｃ以下）場合、酸化触媒によって未燃分を
燃焼させて排ガス温度を上げることにより、脱硝触媒の
ＮＯｘ除去反応を促進させることにもなる．
〔発明が解決しようとする課題〕
前述したように、酸化触媒を上流側に、脱硝触媒を下流
側に設置して排ガス中のＣＯとＮＯｘを処理する装置を
長期運転したところ、脱硝装置の脱硝性能の低下が、脱
硝装置単独で使用する場合に比較して著しいことがわか
った．
上記従来技術は、脱硝性能低下に対する復元法について
配慮されておらず、時間とともに脱硝触媒の活性の低下
を来し、法令規定の排ガスＮＯｘ総量を守ることができ
ず、発電出力を下げて運転するとか、ＮＯｘ量に対する
ＮＨ，注入量を増して脱硝率をキープし、残留ＮＨｊ量
を多くする等、さらには脱硝触媒の交換（寿命短縮）す
る等処置しなければならなくなるという問題がある。Therefore, when installing both an oxidation catalyst and a denitrification catalyst,
It is reasonable to install the oxidation catalyst on the upstream side and the denitrification catalyst on the downstream side. By doing so, when the exhaust gas temperature is low (for example, 250°C or less), the oxidation catalyst burns the unburned matter and raises the exhaust gas temperature, thereby promoting the NOx removal reaction of the denitrification catalyst. [Problems to be Solved by the Invention] As mentioned above, when an oxidation catalyst was installed on the upstream side and a denitrification catalyst was installed on the downstream side to treat CO and NOx in exhaust gas, the device was operated for a long period of time. It was found that the decrease in performance was significant compared to when the denitrification equipment was used alone. The above-mentioned conventional technology does not take into account the recovery method for the deterioration of denitrification performance, and the activity of the denitrification catalyst decreases over time, making it impossible to maintain the total amount of exhaust gas NOx as stipulated by law, and resulting in operation with reduced power generation output. In addition, there are problems in that it is necessary to take measures such as increasing the amount of NH and injection relative to the amount of NOx to maintain the denitration rate and increasing the amount of residual NHj, and even replacing the denitration catalyst (shortening its life).
本発明の目的は、一度低下した脱硝触媒の活性の低下を
可及的に元の高活性状態に回復させることにある。An object of the present invention is to restore the once-decreased activity of the denitrification catalyst to its original highly active state as much as possible.
上記した従来技術の問題点は、燃焼排ガス煙道内に配置
され該ガス中の未燃分を燃焼させるための白金、パラジ
ウム、ロジウムのうち１種以上を活性成分とする酸化触
媒装置と、同装置の下流煙道内に設けられ上記排ガス中
の窒素酸化物を除去？るための脱硝触媒装置と、酸化触
媒装置と脱硝触媒装置の中間煙道域に窒素酸化物還元用
アンモニアを供給する装置を設けた燃焼排ガス処理装置
において、脱硝触媒装置の活性低下時に同装置の上流煙
道域にＳ Ｏ ｔガスまたはＳＯ３ガスを供給する装置
を設けたことを特徴とする燃焼排ガス処理装置により解
決される。The problem with the conventional technology described above is that the oxidation catalyst device, which is placed in the flue gas flue and has at least one of platinum, palladium, and rhodium as an active ingredient, is used to burn unburned components in the gas, and the device installed in the downstream flue to remove nitrogen oxides from the above exhaust gas? In a combustion exhaust gas treatment system that is equipped with a denitrification catalyst device for reducing nitrogen oxides and a device that supplies ammonia for reducing nitrogen oxides to the flue region between the oxidation catalyst device and the denitrification catalyst device, when the activity of the denitration catalyst device decreases, the The problem is solved by a combustion exhaust gas treatment device characterized by providing a device for supplying S O t gas or SO3 gas to the upstream flue region.
脱硝触媒の性能劣下の原因について検討したところ、酸
化触媒としての白金、パラジウム、ロジウム等が使用時
に気相化して下流の脱硝触媒表面に付着し、還元剤とし
てのＮＨ．を酸化してＮｏＸにする作用をしているため
であることが判明した．
脱硝触媒表面に付着した白金等は、水洗等の方法では除
去することが困難であった。そこで本発明者らは、ＳＯ
’ｚやＳｏ３ （以下、ＳＯｘという）を使ってこれを
無害化することに成功した。When we investigated the causes of performance deterioration of denitration catalysts, we found that platinum, palladium, rhodium, etc. as oxidation catalysts become vaporized during use and adhere to the surface of downstream denitration catalysts, and NH. It turns out that this is because it has the effect of oxidizing and converting it into NoX. It has been difficult to remove platinum and the like adhering to the surface of the denitrification catalyst by washing with water or the like. Therefore, the inventors of the present invention
We succeeded in making this harmless using 'z and So3 (hereinafter referred to as SOx).
白金やパラジウム、ロジウムは元来ＳＯ■をＳＯ，にす
る触媒であるが、ＳＯ３は白金表面に付着して離れ難い
性質があり、脱硝触媒に付着した白金やパラジウム、ロ
ジウムをＳＯｘで処理することにより、これらがＮＨ３
をＮｏχにする性質を減殺することができる。Platinum, palladium, and rhodium are originally catalysts that convert SO■ into SO, but SO3 has the property of adhering to the platinum surface and being difficult to separate from. Platinum, palladium, and rhodium adhering to the denitration catalyst can be treated with SOx. Therefore, these are NH3
It is possible to reduce the property that makes it Noχ.
なお、脱硝触媒上に付着した白金やパラジウム、ロジウ
ムをＳ Ｏ ｓで処理する際、ＳＯｘはＴｉ１Ｖ，Ｍｏ
，Ｗの酸化物からなる脱硝触媒自体にも吸着されるので
、ＳＯ，ガスが性能の劣下した脱硝触媒全体に吸着され
るのに、ある程度の時間が必要である。Note that when treating platinum, palladium, and rhodium attached to the denitrification catalyst with SOs, SOx is treated with Ti1V, Mo
, W are also adsorbed on the denitrification catalyst itself, which is made of oxides of W. Therefore, it takes a certain amount of time for SO and gas to be adsorbed on the entire denitration catalyst, which has degraded performance.
第１図に示すように、メタン、エタン等のガスを主燃料
としているガス焚ボイラ１０は、燃料ガスをバーナ２よ
り噴射して、燃焼用空気と混合して燃焼する．燃焼した
とき、バーナの調子が悪いとか、空気とのミキシングの
具合が悪いと、量の多少はあるもののＣＯガス、ＮＯｘ
ガスを発生する。As shown in FIG. 1, a gas-fired boiler 10 whose main fuel is a gas such as methane or ethane injects fuel gas from a burner 2, mixes it with combustion air, and burns it. During combustion, if the burner is not in good condition or the mixing with the air is not good, CO gas and NOx may be produced, although the amount may be small.
Generates gas.
燃焼ガスは火炉１で熱吸収されながら過熱器や再熱器３
、節炭器５等を経由し、空気予熱器、集塵器を経て煙突
から排出される。この途中にＣＯガスを酸化するＣＯ酸
化触媒層４、ＮＯｘを還元する脱硝触媒層６が設けられ
る。脱硝触媒の直前にはＮＯｘをＮｚ 、Ｈｚ Ｏに分
解するためのアンモニアガス（ＮＨ３ ）がＮ Ｈ ｘ
注入ノズル７より注入される。The combustion gas absorbs heat in the furnace 1 and then passes through the superheater and reheater 3.
, an air preheater, a dust collector, etc., and then is discharged from the chimney. A CO oxidation catalyst layer 4 that oxidizes CO gas and a denitrification catalyst layer 6 that reduces NOx are provided in the middle. Immediately before the denitrification catalyst, ammonia gas (NH3) for decomposing NOx into Nz and HzO is converted into NHx.
It is injected from the injection nozzle 7.
脱硝触媒の上流に配置され、ＣＯガスをＣＯ２ガスに酸
化するＣＯ酸化触媒層４は白金（ＰＬ）やロジウムを含
むものが一般に使用される。この白金やロジウムは、長
期運転、負荷変化（温度変化を含む）により部分的に下
流へ飛散する。The CO oxidation catalyst layer 4, which is disposed upstream of the denitrification catalyst and oxidizes CO gas to CO2 gas, generally contains platinum (PL) or rhodium. This platinum and rhodium are partially scattered downstream due to long-term operation and load changes (including temperature changes).
飛散した白金などは下流の脱硝触媒にも付着し、脱硝触
媒の脱硝率低下を起こしている。本発明ではこれを防止
するために、または脱硝触媒の脱硝性能回復方法として
、ＳＯ，ガスを排ガス中に所定時間注入するノズル８を
脱硝触媒層６の上流側に設けた。The scattered platinum also adheres to the downstream denitrification catalyst, causing a decrease in the denitrification rate of the denitrification catalyst. In the present invention, in order to prevent this or as a method for recovering the denitrification performance of the denitrification catalyst, a nozzle 8 for injecting SO gas into the exhaust gas for a predetermined period of time is provided on the upstream side of the denitrification catalyst layer 6.
第１図の実施例では、燃焼ガスに対し数ｐｐｍのＳＯ，
ガスをＮ Ｈ ３注入ノズルとほぼ同じ位置より注入し
た。また、第２図では燃料ガス中にＳＯ２ガスを事前混
合させた例を示す。さらに、第１〜２図では示していな
いが、押込通風機等の吸込み口や、火炉、過熱器、再熱
器を設置した場所より燃焼ガス中にＳＯ２またはＳＯ，
ガス、希硫酸を混入させる方法も同様な効果が得られる
。In the embodiment shown in FIG. 1, several ppm of SO,
Gas was injected from approximately the same position as the NH3 injection nozzle. Further, FIG. 2 shows an example in which SO2 gas is premixed in the fuel gas. Furthermore, although not shown in Figures 1 and 2, SO2 or SO2 is added to the combustion gas from the inlet of a forced draft fan or the location where a furnace, superheater, or reheater is installed.
Similar effects can be obtained by mixing gas or dilute sulfuric acid.
なお、ＳＯ２ガスやＳＯ，ガスは、触媒活性成分である
白金またはパラジウム、ロジウムの表面に付着して酸化
作用を低減させるので、脱硝触媒の活性回復のためのＳ
Ｏ２、ＳＯ３ガスの注入は、酸化触媒装置と脱硝触媒装
置の中間煙道内に行うのが望ましい。Note that SO2 gas, SO gas, and other gases adhere to the surface of platinum, palladium, or rhodium, which are catalyst active components, and reduce the oxidizing effect.
It is desirable that the O2 and SO3 gases be injected into the intermediate flue between the oxidation catalyst device and the denitration catalyst device.
以上述べたように、本発明では脱硝触媒の前流に所定時
間、排ガス量に対し約数ｐｐｍないし数百ｐｐｍのＳ
Ｏ ’ｓガスを添加することにより、白金（Ｐｔ）等を
無害なものにし、初期の脱硝性能に近い脱硝触媒に復元
することができる。As described above, in the present invention, S of approximately several ppm to several hundred ppm relative to the amount of exhaust gas is applied for a predetermined period of time upstream of the denitrification catalyst.
By adding O's gas, platinum (Pt) and the like can be made harmless, and the denitrification catalyst can be restored to a denitrification catalyst with close to its initial denitrification performance.
このＳＯｓガス注入は脱硝率を測定し、初期値より３％
程度低下した時点で手動で行ってもよいが、第３図のよ
うな自動注入回路を組んでおくのもよい，すなわち、脱
硝装置出口ＮＯｘと人口Ｎ０ｘの比を算出し、その値が
ボイラ負荷をパラメータとした新しい脱硝触媒より得ら
れた値に数％加算した値より大きくなった（すなわち、
新触媒設置時より数％脱硝性能が下がった）時点でＳＯ
，注入弁に信号を送り、排ガス量に対し数ｐｐｍ〜数百
ｐｐｍのＳ Ｏ ３ガスを所定時間（数分〜数時間）注
入する。This SOs gas injection measures the denitrification rate, which is 3% higher than the initial value.
This can be done manually when the level has decreased, but it is also a good idea to set up an automatic injection circuit as shown in Figure 3. In other words, calculate the ratio of NOx at the exit of the denitrification equipment to the population NOx, and use that value as the boiler load. It was larger than the value obtained by adding a few percent to the value obtained with the new denitrification catalyst using the parameter (i.e.,
The SO
, a signal is sent to the injection valve, and several ppm to several hundred ppm of SO 3 gas is injected for a predetermined time (several minutes to several hours) with respect to the amount of exhaust gas.
ＳＯ，注入しても直ちに脱硝性能が復活する訳ではなく
、数分から数時間後より徐々に性能復活するので、２〜
３時間後再チェックし、もし復活量が少ないようであれ
ば再注入するとよい。Even if SO is injected, the denitrification performance will not be restored immediately, but the performance will be restored gradually from a few minutes to a few hours later.
Check again after 3 hours, and if the amount recovered is low, it is recommended to re-inject.
脱硝触媒の表面に付着している白金（ＰＬ）等の量によ
ってＳＯ，注入量は左右されるが、上記注入を２〜３回
繰返すことによって脱硝率の復活は可能となる．
〔発明の効果〕
本発明によれば、上流側に白金などの酸化触媒を設け、
その下流に脱硝触媒を設置して排ガス中のＧＯなどの未
燃分を燃焼させ、また排ガス中のＮＯｘを除去するもの
において、気相化した白金などが下流の脱硝触媒に付着
したために発生する脱硝性能の劣下を簡単な手段により
容易に、かつ安価に回復させることができる。Although the amount of SO injection depends on the amount of platinum (PL) etc. attached to the surface of the denitration catalyst, it is possible to restore the denitration rate by repeating the above injection two to three times. [Effects of the Invention] According to the present invention, an oxidation catalyst such as platinum is provided on the upstream side,
This occurs because platinum, etc. in the vapor phase adheres to the downstream denitrification catalyst when a denitrification catalyst is installed downstream to burn unburned substances such as GO in the exhaust gas, and also to remove NOx from the exhaust gas. Deterioration in denitrification performance can be easily and inexpensively recovered by simple means.
第１図は、ボイラ燃焼装置において、ＳＯ，ガスを脱硝
触媒直前の上流側に注入するようになした本発明の実施
例図、第２図は、同じくボイラ燃焼装置において、燃料
ガス中にＳＯｔガスを添加するようになした他の実施例
図、第３図は、ＳＯ，ガス注入を自動的に行う際のブロ
ック図である．１・・・火炉、２・・・ガスバーナ、３
・・・過熱器、再熱器、４・・・ＣＯ酸化用触媒層、５
・・・節炭器、６・・・脱硝触媒層、７・・・ＮＨ．注
入ノズル、８・・・ＳＯ，注入ノズル、１０・・・ボイ
ラ。Fig. 1 shows an embodiment of the present invention in which SO and gas are injected into the upstream side immediately before the denitrification catalyst in a boiler combustion equipment, and Fig. 2 shows an embodiment of the present invention in which SO and gas are injected into the fuel gas in a boiler combustion equipment. Another embodiment in which gas is added is shown in FIG. 3, which is a block diagram when automatically injecting SO and gas. 1... Furnace, 2... Gas burner, 3
...superheater, reheater, 4...catalyst layer for CO oxidation, 5
. . . Carbon saver, 6. Denitration catalyst layer, 7. NH. Injection nozzle, 8...SO, injection nozzle, 10...boiler.
Claims (5)
燃焼させるための白金、パラジウム、ロジウムのうち１
種以上を活性成分とする酸化触媒装置と、同装置の下流
煙道内に設けられ上記排ガス中の窒素酸化物を除去する
ための脱硝触媒装置と、酸化触媒装置と脱硝触媒装置の
中間煙道域に窒素酸化物還元用アンモニアを供給する装
置を設けた燃焼排ガス処理装置において、脱硝触媒装置
の活性低下時に同装置の上流煙道域にＳＯ＿２ガスまた
はＳＯ＿３ガスを供給する装置を設けたことを特徴とす
る燃焼排ガス処理装置。(1) One of platinum, palladium, and rhodium placed in the flue gas flue to burn unburned components in the gas.
an oxidation catalyst device having at least one of the following active ingredients; a denitrification catalyst device installed in a flue downstream of the device to remove nitrogen oxides from the exhaust gas; and an intermediate flue region between the oxidation catalyst device and the denitrification catalyst device. A combustion exhaust gas treatment device is equipped with a device for supplying ammonia for reducing nitrogen oxides to the combustion exhaust gas treatment device, and is characterized by being equipped with a device to supply SO_2 gas or SO_3 gas to the upstream flue region of the device when the activity of the denitrification catalyst device decreases. Combustion exhaust gas treatment equipment.
＿３ガスを供給する装置の供給口を酸化触媒装置と脱硝
触媒装置の中間煙道域に設けたことを特徴とする燃焼排
ガス処理装置。(2) In claim (1), SO_2 gas or SO
_3 A combustion exhaust gas treatment device characterized in that the supply port of the device for supplying gas is provided in an intermediate flue region between an oxidation catalyst device and a denitrification catalyst device.
、ロジウムのうち１種以上を活性成分とする酸化触媒装
置と、同装置の下流煙道内に設けられた脱硝触媒装置と
、酸化触媒装置と脱硝触媒装置の中間煙道域にアンモニ
アを供給する装置を有する燃焼排ガス処理装置における
活性低下脱硝触媒の再生方法において、該脱硝触媒の上
流煙道域にＳＯ＿２をガスまたはＳＯ＿３ガスを所定時
間供給することを特徴とする燃焼排ガス処理装置の再生
方法。(3) An oxidation catalyst device disposed in the flue gas flue containing one or more of platinum, palladium, and rhodium as an active ingredient, a denitrification catalyst device disposed in the downstream flue of the same device, and an oxidation catalyst device In a method for regenerating a denitrification catalyst with decreased activity in a combustion exhaust gas treatment device having a device for supplying ammonia to an intermediate flue region of a denitrification catalyst device, SO_2 gas or SO_3 gas is supplied for a predetermined period of time to an upstream flue region of the denitrification catalyst. A method for regenerating a combustion exhaust gas treatment device, characterized in that:
＿３ガスの供給を燃焼排ガス量に対し数ｐｐｍから数百
ｐｐｍとしたことを特徴とする燃焼排ガス処理装置の再
生方法。(4) In claim (3), SO_2 gas or SO
_3 A method for regenerating a combustion exhaust gas treatment device, characterized in that the amount of gas supplied is from several ppm to several hundred ppm relative to the amount of combustion exhaust gas.
＿３ガスを供給して２〜３時間経過後脱硝触媒装置の性
能を確認するとともに、同装置の性能回復不充分の場合
は再度ＳＯ＿２ガスまたはＳＯ＿３ガスを供給すること
を特徴とする燃焼排ガス処理装置の再生方法。(5) In claim (3), SO_2 gas or SO
A combustion exhaust gas treatment device characterized by checking the performance of the denitrification catalyst device after 2 to 3 hours have elapsed after supplying _3 gas, and supplying SO_2 gas or SO_3 gas again if the performance recovery of the device is insufficient. How to play.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1188584A JPH0352626A (en) | 1989-07-20 | 1989-07-20 | Waste combustion gas treating device and regerating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1188584A JPH0352626A (en) | 1989-07-20 | 1989-07-20 | Waste combustion gas treating device and regerating method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0352626A true JPH0352626A (en) | 1991-03-06 |
Family
ID=16226231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1188584A Pending JPH0352626A (en) | 1989-07-20 | 1989-07-20 | Waste combustion gas treating device and regerating method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0352626A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819446B1 (en) | 1999-04-13 | 2004-11-16 | Tohoku Ricoh Co., Ltd. | Image forming system |
-
1989
- 1989-07-20 JP JP1188584A patent/JPH0352626A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819446B1 (en) | 1999-04-13 | 2004-11-16 | Tohoku Ricoh Co., Ltd. | Image forming system |
| US7123377B2 (en) | 1999-04-13 | 2006-10-17 | Tohoku Ricoh Co., Ltd. | System for managing number of sheets for image formation |
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