JPH08173769A - Dry type denitrification apparatus - Google Patents
Dry type denitrification apparatusInfo
- Publication number
- JPH08173769A JPH08173769A JP6322447A JP32244794A JPH08173769A JP H08173769 A JPH08173769 A JP H08173769A JP 6322447 A JP6322447 A JP 6322447A JP 32244794 A JP32244794 A JP 32244794A JP H08173769 A JPH08173769 A JP H08173769A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- denitrification
- exhaust gas
- denitration
- catalyst layer
- 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
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は石炭を主燃料とする燃焼
設備より排出される排ガスの乾式脱硝装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry denitration device for exhaust gas discharged from a combustion facility using coal as a main fuel.
【０００２】[0002]
【従来の技術】従来より石炭を主燃料とするボイラなど
の燃焼設備より排出される排ガスは乾式脱硝装置におい
て、脱硝触媒の存在下、アンモニアなどの還元剤によっ
て処理され、排ガス中の窒素酸化物は無害化されてい
る。2. Description of the Related Art Conventionally, exhaust gas discharged from a combustion facility such as a boiler, which mainly uses coal as a main fuel, is treated with a reducing agent such as ammonia in a dry denitration device in the presence of a denitration catalyst to produce nitrogen oxide Has been rendered harmless.
【０００３】[0003]
【発明が解決しようとする課題】石炭を主燃料とするボ
イラなどの燃焼設備より排出される排ガスの乾式脱硝装
置においては排ガス中に含まれる酸化カルシウム微粒子
が脱硝触媒（ＴｉＯ2 −ＷＯ3 −Ｖ2 Ｏ5 系）の表面に
付着し、徐々にガス中の硫黄酸化物と下記（１）式のよ
うに反応し、石こう化する。In a dry denitration apparatus for exhaust gas discharged from combustion equipment such as a boiler using coal as a main fuel, fine particles of calcium oxide contained in the exhaust gas are used as a denitration catalyst (TiO 2 -WO 3 -V). 2 O 5 type) and gradually reacts with sulfur oxides in the gas as shown in the following formula (1) to form gypsum.
【化１】 ＣａＯ ＋ ＳＯ3 → ＣａＳＯ4 ・・・・（１） そして、この石こうが脱硝触媒表面の細孔を閉塞するこ
とにより、窒素酸化物や還元剤であるアンモニアの触媒
内部への拡散が妨げられ脱硝触媒の性能が低下するとい
う不具合があった。しかし、従来、この原因による脱硝
触媒の性能低下を防止する対策はなかった。[Chemical formula 1] CaO + SO 3 → CaSO 4 ··· (1) Then, this gypsum blocks pores on the surface of the denitration catalyst to diffuse nitrogen oxides and ammonia, which is a reducing agent, into the catalyst. However, there is a problem that the performance of the denitration catalyst is deteriorated due to the interference with the above. However, heretofore, there has been no countermeasure for preventing the performance of the denitration catalyst from being deteriorated due to this cause.
【０００４】本発明は、上記技術水準に鑑み、上述した
ような脱硝触媒の性能低下を防止しうる乾式脱硝装置を
提供しようとするものである。In view of the above-mentioned state of the art, the present invention is to provide a dry type denitration apparatus capable of preventing the performance deterioration of the denitration catalyst as described above.
【０００５】[0005]
【課題を解決するための手段】本発明は石炭を主燃料と
する燃焼設備より排出される排ガス中に還元剤を注入し
て、窒素酸化物選択還元触媒であるハニカム状に形成さ
れたＴｉＯ2 −ＷＯ3−Ｖ2 Ｏ5 系の触媒の存在下で窒
素酸化物を分解除去する乾式脱硝装置であって、該脱硝
装置内に配置された脱硝触媒層のガス上流側に、同じＴ
ｉＯ2 −ＷＯ3−Ｖ2 Ｏ5 系の触媒をその表面にコート
した金属またはこれに類する強度の材料で作られた格子
板を取替え可能に配置してなることを特徴とする乾式脱
硝装置である。According to the present invention, a reducing agent is injected into an exhaust gas discharged from a combustion facility using coal as a main fuel to form a honeycomb-shaped TiO 2 which is a nitrogen oxide selective reduction catalyst. -WO 3 -V 2 O 5 -based dry denitration apparatus for decomposing and removing nitrogen oxides in the presence of a catalyst, wherein the same T is provided on the gas upstream side of the denitration catalyst layer disposed in the denitration apparatus.
A dry denitration apparatus characterized in that a lattice plate made of a metal having a surface coated with an iO 2 -WO 3 -V 2 O 5 type catalyst or a material having a similar strength is replaceably arranged. is there.
【０００６】本発明において使用されるＴｉＯ2 −ＷＯ
3 −Ｖ2 Ｏ5 系の脱硝触媒の組成は限定的なものではな
いが、略々、ＴｉＯ2 ：７０重量％、ＷＯ3 ：１０重量
％、Ｖ2 Ｏ5 ：１重量％のものであり、これ以外に助触
媒として作用する元素酸化物を少量含みうるものであ
る。TiO 2 -WO used in the present invention
The composition of the 3- V 2 O 5 -based denitration catalyst is not limited, but is approximately TiO 2 : 70 wt%, WO 3 : 10 wt%, V 2 O 5 : 1 wt%. Other than this, it may contain a small amount of an element oxide that acts as a co-catalyst.
【０００７】[0007]
【作用】触媒層の上流側にＴｉＯ2 −ＷＯ3 −Ｖ2 Ｏ5
系触媒をコートした金属またはこれに類する強度の材料
の格子板を取替え可能に設置することにより、排ガス中
の酸化カルシウムをこの上に付着させる。そうすること
により触媒層本体への酸化カルシウムの流入量が抑えら
れ、触媒表面への石こうの付着を防ぐことができる。ま
た、格子板への酸化カルシウム（ひいては石こう）の付
着量が大きくなって、ガス流れの圧損が大になれば、こ
の格子板を取替えるだけで前記の作用が回復し、触媒層
本体の劣化を防止することができる。[Function] TiO 2 —WO 3 —V 2 O 5 is provided on the upstream side of the catalyst layer.
Calcium oxide in the exhaust gas is deposited on the grid plate of a metal or a material having a similar strength coated with the system catalyst so that the grid plate can be replaced. By doing so, the amount of calcium oxide flowing into the main body of the catalyst layer is suppressed, and the adhesion of gypsum to the catalyst surface can be prevented. In addition, if the amount of calcium oxide (and thus gypsum) attached to the lattice plate becomes large and the pressure loss of the gas flow becomes large, simply replacing the lattice plate will restore the above-mentioned action and prevent deterioration of the catalyst layer body. Can be prevented.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図に基づいて説明
する。図１は本発明の乾式脱硝装置の一態様の説明図
で、１は排ガス、２は脱硝反応器、３は該脱硝反応器に
配置されている複数段（図においては２段）のハニカム
状のＴｉＯ2 −ＷＯ3 −Ｖ2Ｏ5 系の脱硝触媒層、４は
該脱硝触媒層のガス上流側に取替え自在に配置されたＴ
ｉＯ2 −ＷＯ3 −Ｖ2 Ｏ5 系の脱硝触媒をコートした金
属の格子板を示す。図２は図１に示したＴｉＯ2 −ＷＯ
3 −Ｖ2 Ｏ5 系の脱硝触媒をコートした格子板４の斜視
図、図３は同格子板４の拡大平面図で、５はコートされ
たＴｉＯ2 −ＷＯ3 −Ｖ2 Ｏ5 系の脱硝触媒層である。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of one embodiment of the dry denitration apparatus of the present invention, 1 is an exhaust gas, 2 is a denitration reactor, and 3 is a honeycomb shape of a plurality of stages (two stages in the figure) arranged in the denitration reactor Of the TiO 2 —WO 3 —V 2 O 5 -based denitration catalyst layer 4 is replaceably arranged on the gas upstream side of the denitration catalyst layer.
1 shows a metal lattice plate coated with an io 2 -WO 3 -V 2 O 5 -based denitration catalyst. FIG. 2 shows the TiO 2 -WO shown in FIG.
FIG. 3 is a perspective view of a lattice plate 4 coated with a 3- V 2 O 5 -based denitration catalyst, FIG. 3 is an enlarged plan view of the lattice plate 4, and 5 is a coated TiO 2 —WO 3 —V 2 O 5 system. It is a denitration catalyst layer.
【０００９】上記図１〜図３に示した脱硝反応器２にお
ける格子板４の格子の大きさはできるだけ排ガス１との
接触面積が大きくなるように小さい方が好ましいが、圧
力損失などを考慮して１０ｍｍ角程度が適当である。格
子の長さ（ガス流れ方向の寸法）については３００ｍｍ
以内が好ましい。格子板４の格子部分には図３に示すよ
うに内部に１ｍｍ程度の厚さのＴｉＯ2 −ＷＯ3 −Ｖ2
Ｏ5 系触媒５をコートすることが好ましい。これを脱硝
反応器２内の脱硝触媒層３のガス上流側に配置すること
により、排ガス中の酸化カルシウムを該格子板のＴｉＯ
2 −ＷＯ3 −Ｖ 2 Ｏ5 系触媒５に付着させ、後流の脱硝
触媒層３への酸化カルシウムの流入量を抑え、該触媒層
３の劣化を防止する。The denitration reactor 2 shown in FIGS.
The size of the grid of the grid plate 4 should be as large as possible with the exhaust gas 1.
It is preferable that it is small so that the contact area becomes large, but
Considering force loss and the like, about 10 mm square is suitable. Case
300 mm for the length of the child (dimension in the gas flow direction)
It is preferably within. The lattice part of the lattice plate 4 is shown in FIG.
TiO with a thickness of about 1 mm inside2-WO3-V2
OFiveIt is preferable to coat the system catalyst 5. Denitration this
Arrangement on the gas upstream side of the denitration catalyst layer 3 in the reactor 2.
To remove calcium oxide in the exhaust gas from the TiO 2 of the lattice plate.
2-WO3-V 2OFiveDegreasing after adhering to the system catalyst 5
The amount of calcium oxide flowing into the catalyst layer 3 is suppressed, and the catalyst layer
Prevent deterioration of 3.
【００１０】脱硝触媒の触媒性能比と排ガスのフライア
ッシュ中のＣａＯ濃度との関係を図４に示しますが、ア
ッシュ中のＣａＯ濃度が大きくなる程、触媒性能比は低
下する傾向が見られる。FIG. 4 shows the relationship between the catalyst performance ratio of the denitration catalyst and the CaO concentration of the exhaust gas fly ash. The catalyst performance ratio tends to decrease as the CaO concentration of the ash increases.
【００１１】脱硝触媒のガス流れ方向のＣａＯ付着濃度
を確認の結果、表１に示すように触媒のガス入口側３０
０ｍｍ以内の部分にベース値（触媒製造直後に含まれて
いるＣａＯ値）＋１％、それ以後はベース値＋０．１〜
０．２ｗｔ％となっていることから、より多くのＣａＯ
が脱硝触媒のガス入口側に付着していることが確認され
た。As a result of confirming the CaO deposition concentration in the gas flow direction of the denitration catalyst, as shown in Table 1, the catalyst gas inlet side 30
Base value (CaO value included immediately after catalyst production) + 1% in the area within 0 mm, and base value +0.1 to thereafter.
Since it is 0.2 wt%, more CaO
Was confirmed to be attached to the gas inlet side of the denitration catalyst.
【００１２】[0012]
【表１】 この結果より、格子板４の長さは３００ｍｍ以内とすれ
ば十分である。[Table 1] From this result, it is sufficient that the length of the lattice plate 4 is within 300 mm.
【００１３】[0013]
【発明の効果】本発明により、排ガス中の酸化カルシウ
ムを触媒層入口で除去することができるので触媒の長寿
命化が可能となり費用の節減ともなる。According to the present invention, calcium oxide in exhaust gas can be removed at the inlet of the catalyst layer, so that the life of the catalyst can be extended and the cost can be reduced.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の乾式脱硝装置の一態様の説明図。FIG. 1 is an explanatory view of one embodiment of a dry denitration apparatus of the present invention.
【図２】本発明の乾式脱硝装置に配置される格子板の斜
視図。FIG. 2 is a perspective view of a lattice plate arranged in the dry denitration apparatus of the present invention.
【図３】図２の格子板の拡大平面図。FIG. 3 is an enlarged plan view of the lattice plate shown in FIG.
【図４】脱硝装置の脱硝触媒の排ガス中のフライアッシ
ュのＣａＯ濃度と触媒性能との相関々係を示す図表。FIG. 4 is a chart showing the correlation between the CaO concentration of fly ash in the exhaust gas of the denitration catalyst of the denitration device and the catalyst performance.
Claims (1)
れる排ガス中に還元剤を注入して、窒素酸化物選択還元
触媒であるハニカム状に形成されたＴｉＯ2−ＷＯ3 −
Ｖ2 Ｏ5 系の触媒の存在下で窒素酸化物を分解除去する
乾式脱硝装置であって、該脱硝装置内に配置された脱硝
触媒層のガス上流側に、同じＴｉＯ2−ＷＯ3 −Ｖ2 Ｏ
5 系の触媒をその表面にコートした金属またはこれに類
する強度の材料で作られた格子板を取替え可能に配置し
てなることを特徴とする乾式脱硝装置。1. A honeycomb-shaped TiO 2 —WO 3 — which is a nitrogen oxide selective reduction catalyst by injecting a reducing agent into the exhaust gas discharged from a combustion facility using coal as a main fuel.
A dry denitration apparatus for decomposing and removing nitrogen oxides in the presence of a V 2 O 5 type catalyst, wherein the same TiO 2 —WO 3 —V is provided on the gas upstream side of a denitration catalyst layer arranged in the denitration apparatus. 2 O
A dry denitration device characterized in that a lattice plate made of a metal having a strength of similar to that coated with a 5- system catalyst is arranged in a replaceable manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32244794A JP3468894B2 (en) | 1994-12-26 | 1994-12-26 | Dry denitration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32244794A JP3468894B2 (en) | 1994-12-26 | 1994-12-26 | Dry denitration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08173769A true JPH08173769A (en) | 1996-07-09 |
| JP3468894B2 JP3468894B2 (en) | 2003-11-17 |
Family
ID=18143771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32244794A Expired - Lifetime JP3468894B2 (en) | 1994-12-26 | 1994-12-26 | Dry denitration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3468894B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004330179A (en) * | 2003-04-18 | 2004-11-25 | Mitsubishi Heavy Ind Ltd | Catalyst for removing nitrogen oxide, catalyst formed product, method for treating exhaust gas and composite power facility |
| JP2013241944A (en) * | 2013-08-05 | 2013-12-05 | Mitsubishi Heavy Ind Ltd | Denitrification device and denitrification method |
-
1994
- 1994-12-26 JP JP32244794A patent/JP3468894B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004330179A (en) * | 2003-04-18 | 2004-11-25 | Mitsubishi Heavy Ind Ltd | Catalyst for removing nitrogen oxide, catalyst formed product, method for treating exhaust gas and composite power facility |
| JP4508615B2 (en) * | 2003-04-18 | 2010-07-21 | 三菱重工業株式会社 | Nitrogen oxide removal catalyst, catalyst molded product, exhaust gas treatment method and combined power generation facility |
| JP2013241944A (en) * | 2013-08-05 | 2013-12-05 | Mitsubishi Heavy Ind Ltd | Denitrification device and denitrification method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3468894B2 (en) | 2003-11-17 |
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