JPH01304030A - Denitration reaction apparatus - Google Patents
Denitration reaction apparatusInfo
- Publication number
- JPH01304030A JPH01304030A JP63134677A JP13467788A JPH01304030A JP H01304030 A JPH01304030 A JP H01304030A JP 63134677 A JP63134677 A JP 63134677A JP 13467788 A JP13467788 A JP 13467788A JP H01304030 A JPH01304030 A JP H01304030A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- ash
- casing
- flue
- 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
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims description 48
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002956 ash Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
- B01J8/0085—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction promoting uninterrupted fluid flow, e.g. by filtering out particles in front of the catalyst layer
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、触媒を使用した乾式の脱硝反応装置に係り、
特に排ガス中に高未燃分の灰を含有する排ガス処理に好
適な脱硝反応装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dry denitrification reaction device using a catalyst,
In particular, the present invention relates to a denitrification reactor suitable for treating exhaust gas containing a high amount of unburned ash in the exhaust gas.
従来技術による脱硝反応装置の例を第５図および第６図
に示す。Examples of conventional denitrification reactors are shown in FIGS. 5 and 6.
脱硝反応器３は、鉄骨７、外部ケーシング８、触媒４、
入口煙道９、出口煙道６、触媒架台１０、灰の堆積防止
板１３（またはインナーケーシング１１）、触媒ケーシ
ング１２から構成されている。The denitrification reactor 3 includes a steel frame 7, an outer casing 8, a catalyst 4,
It is composed of an inlet flue 9, an outlet flue 6, a catalyst stand 10, an ash accumulation prevention plate 13 (or inner casing 11), and a catalyst casing 12.
脱硝処理される入口ガス１４は、アンモニアなどの還元
剤を混入されたのち、灰の堆積防止板を兼ねた排ガスガ
イド１３（またはインナーケーシング１１）の内側を通
り、触媒４に導かれて脱硝処理された後、出口煙道６を
通って煙突等から排出される。The inlet gas 14 to be denitrified is mixed with a reducing agent such as ammonia, passes through the exhaust gas guide 13 (or inner casing 11) which also serves as an ash accumulation prevention plate, is guided to the catalyst 4, and is denitrified. After that, it passes through the exit flue 6 and is discharged from a chimney or the like.
乾式脱硝装置の脱硝反応器は、一般的に約２００℃程度
から４５０℃程度までの高温ガスを処理するため、熱膨
張による部材の熱伸びを考慮する必要がある。第５図、
第６図においても、入口ガス１４の熱が触媒４の外側空
間スペース１６に伝わり、反応器全体の熱的条件をでき
るだけ同じにするように灰の堆積防止板を兼ねた排ガス
ガイド１３（またはインナーケーシング１１）と触媒ケ
ーシング１２とは溶接構造にせず隙間を空けている。そ
のため、入口ガス１４の圧力変動や渦流による上昇流に
より、上述の隙間等から吹き出した灰が、空間スペース
１６の底部に堆積していた。Since the denitrification reactor of a dry denitrification device generally processes high-temperature gas from about 200° C. to about 450° C., it is necessary to take into account thermal elongation of members due to thermal expansion. Figure 5,
Also in FIG. 6, the heat of the inlet gas 14 is transmitted to the outer space 16 of the catalyst 4, and the exhaust gas guide 13 (or inner The casing 11) and the catalyst casing 12 are not welded and have a gap between them. Therefore, the ash blown out from the above-mentioned gaps and the like was deposited at the bottom of the space 16 due to the pressure fluctuation of the inlet gas 14 and the upward flow caused by the vortex.
従来の装置は、石炭燃焼排ガスや重油燃焼排ガスのよう
に、未燃分の少ない灰を含む排ガスの処理に適用されて
いたため、反応器内に灰が堆積しても問題とはならなか
った。そのため、灰の堆積を防止するための構造につい
ては配慮されていなかった。Conventional equipment was used to treat exhaust gas that contained ash with little unburned content, such as coal combustion exhaust gas or heavy oil combustion exhaust gas, so the accumulation of ash within the reactor did not pose a problem. Therefore, no consideration was given to a structure to prevent the accumulation of ash.
上記従来技術の場合、石炭燃焼排ガスのように排ガス中
に含まれる灰中未燃分が少ない排ガスの場合は、脱硝反
応器内に灰が堆積しても問題にはならなかった。ところ
が、例えば石油コークス燃焼排ガスのように、未燃分の
多い灰を含む排ガスを処理する場合は、反応器内部に灰
が堆積していると、例えば点検特等プラント停止時には
、ボイラポストパージのために（検査員が煙道内に入っ
て検査するためには、酸素分の少ない燃焼排ガスを新鮮
な空気に入れ替える必要がある）、フレッシュエアを押
込ファンで送り込んだり、誘引ファンで吸い込んだり、
またはマンホール等を開放してフレッシュエアが入り込
む。このように、フレッシュエアが脱硝反応器内に入る
と酸素分圧が高くなり、まだ冷却し切らずに高温の未燃
分を含む灰と接触することになり、灰が着火する。従来
装置では、このような高未燃分の灰を含有する排ガス処
理の問題点については考慮されていなかった。In the case of the above-mentioned conventional technology, in the case of exhaust gas containing a small amount of unburned ash in the exhaust gas, such as coal combustion exhaust gas, there was no problem even if ash accumulated in the denitrification reactor. However, when processing exhaust gas containing a large amount of unburned ash, such as petroleum coke combustion exhaust gas, if ash accumulates inside the reactor, for example, when a special inspection plant is shut down, boiler post purge may be required. (In order for inspectors to enter the flue for inspection, it is necessary to replace the combustion exhaust gas with a low oxygen content with fresh air.) Fresh air is sent in with a forced fan, sucked in with an induced fan,
Or open a manhole etc. to let fresh air in. In this way, when the fresh air enters the denitrification reactor, the oxygen partial pressure increases, and the ash comes into contact with the high temperature ash containing unburned matter without being completely cooled down, causing the ash to ignite. Conventional devices have not taken into account the problems of treating exhaust gas containing such high unburned ash.
本発明の目的は、上記した従来技術の問題点をなくし、
高未燃分の灰を含有する排ガス処理においても、脱硝反
応器内に灰が堆積しない脱硝反応装置を提供するにある
。The purpose of the present invention is to eliminate the problems of the prior art described above,
It is an object of the present invention to provide a denitrification reactor in which ash does not accumulate in the denitrification reactor even in the treatment of exhaust gas containing a high amount of unburned ash.
上記した従来技術の問題点は、窒素酸化物を含有する排
ガスを導入する入口煙道と、導入された排ガスを処理し
て排ガス中の窒素酸化物を除去する脱硝反応器と、処理
後の排ガスを排出する出口煙道とを有する脱硝反応装置
において、脱硝反応器は触媒を収納した触媒ケーシング
と、触媒ケーシングを支える架台と、触媒ケーシングを
所定の空間スペースを隔てて収容し、かつ入口煙道およ
び出口煙道と接続された外部ケーシングと、外部ケーシ
ングと触媒ケーシングとの間に設けられ、排ガスを触媒
に導く排ガスガイドとよりなり、外部ケーシングと触媒
ケーシングの間の空間スペースの底部には、排ガス煙道
に通じる開口部を設けたことを特徴とする脱硝反応装置
により解決される。The problems with the conventional technology described above are that the inlet flue introduces exhaust gas containing nitrogen oxides, the denitrification reactor that processes the introduced exhaust gas to remove nitrogen oxides from the exhaust gas, and the exhaust gas after treatment. In a denitrification reactor, the denitrification reactor has a catalyst casing containing a catalyst, a pedestal supporting the catalyst casing, a mount that houses the catalyst casing with a predetermined space apart, and an inlet flue. and an outer casing connected to the outlet flue, and an exhaust gas guide provided between the outer casing and the catalyst casing to guide the exhaust gas to the catalyst, and at the bottom of the space between the outer casing and the catalyst casing. The problem is solved by a denitrification reactor characterized in that it is provided with an opening that communicates with the exhaust gas flue.
第４図にアンモニアによる接触還元法の乾式脱硝装置の
系統図の一例を示す。Figure 4 shows an example of a system diagram of a dry denitrification equipment using catalytic reduction using ammonia.
図において、ボイラ１からの燃−焼排ガスは煙道２、入
口煙道９を通って脱硝反応器３に入り、脱硝反応器３内
に充愼しである触媒４と煙道２内に、アンモニア注入装
置５より注入したアンモニアと反応して脱硝処理される
。脱硝処理後の排ガスは、反応器出口煙道６を通って煙
突等から排気される。In the figure, combustion exhaust gas from a boiler 1 enters the denitrification reactor 3 through a flue 2 and an inlet flue 9, and enters the denitrification reactor 3 and a catalyst 4 filled with the flue 2. It reacts with ammonia injected from the ammonia injector 5 and is denitrated. The exhaust gas after the denitrification process passes through the reactor outlet flue 6 and is exhausted from a chimney or the like.
次に、第１図に本発明になる脱硝反応装置の構造の一例
を示す。第１図の脱硝反応装置は、鉄骨７、外部ケーシ
ング８、触媒４、入口煙道９、出口煙道６、触媒架台１
０、灰の堆積防止板を兼ねた排ガスガイド１３ （また
はインナーケーシング１１）、触媒ケーシング１２およ
び灰抜出口１７から構成されている。また、反応器底部
の一部には開口部１５を設けている。脱硝処理される入
口排ガス１４は、触媒４を通過して出口煙道６から排出
される。排ガスガイド１３と触媒ケーシング１２との間
は、熱による伸びを考慮して溶接構造となっていないた
め隙間が生じている。また、反応器底部に開口部１５を
設けていることにより、排ガスの一部は上記の隙間から
触媒４と外部ケーシング８との間の触媒外側空間スペー
ス１６に入り、触媒４および排ガスガイド１３側、すな
わち排ガス通路側と外部ケーシング８とは同じ温度条件
となるため、局部的な熱変形によるひずみを避けること
ができる。また、触媒外側の空間スペース１６に、ガス
と同伴して侵入してきた灰は、反応器底部の開口部１５
から出口煙道６に排出することができる。第１図の反応
器底部開口部１５は、灰を抜出し易いように内部に傾斜
させた板を張り、ホッパ形状としている。さらに、出口
煙道６に堆積した未燃灰を含む灰は、同煙道に設けたホ
ッパ状の灰抜出口１７より外部に取出されるが、発火防
止のために取出す前に水などをスプレーして取出すのが
好ましい。なお、開口部１５により触媒外側空間スペー
ス１６は、煙道と連通されているので、排ガスガイド１
３と触媒ケーシング１２の入口側とは溶接したとしても
、熱的に特別の問題は生じない。Next, FIG. 1 shows an example of the structure of the denitrification reactor according to the present invention. The denitrification reactor shown in FIG.
0, an exhaust gas guide 13 (or inner casing 11) which also serves as an ash accumulation prevention plate, a catalyst casing 12, and an ash outlet 17. Further, an opening 15 is provided in a part of the bottom of the reactor. The inlet exhaust gas 14 to be denitrified passes through the catalyst 4 and is discharged from the outlet flue 6. There is a gap between the exhaust gas guide 13 and the catalyst casing 12 because they are not welded to prevent expansion due to heat. Furthermore, by providing an opening 15 at the bottom of the reactor, a portion of the exhaust gas enters the catalyst outer space 16 between the catalyst 4 and the outer casing 8 through the above-mentioned gap, and enters the catalyst 4 and exhaust gas guide 13 side. That is, since the exhaust gas passage side and the outer casing 8 are under the same temperature conditions, distortion due to local thermal deformation can be avoided. In addition, the ash that has entered the space 16 outside the catalyst along with the gas is removed from the opening 15 at the bottom of the reactor.
can be discharged from the outlet flue 6. The bottom opening 15 of the reactor shown in FIG. 1 has a hopper shape with an inclined plate attached therein so as to facilitate the extraction of ash. Furthermore, the ash including unburned ash accumulated in the outlet flue 6 is taken out from the hopper-shaped ash outlet 17 provided in the same flue, but water or the like is sprayed before taking it out to prevent ignition. It is preferable to take it out. In addition, since the catalyst outer space space 16 is communicated with the flue through the opening 15, the exhaust gas guide 1
3 and the inlet side of the catalyst casing 12 are welded together, no particular thermal problem occurs.
本発明の他の実施例を第２図および第３図に示す。本発
明の目的は、脱硝反応装置内に灰が堆積するのを防止す
ることであり、本実施例はインナーケーシング１１と触
媒ケーシング１２の隙間から触媒外側の空間スペース１
６に灰が侵入しないようにしたものである。第２図は、
上記隙間部の全周にガスシール装置としてガスシール用
充填材（ロープ状の保温材）１８を取付けて灰の侵入を
防止するものである。第３図は、触媒外側の空間スペー
ス１６全体に、ガスシール用、１材１８（保温材、灰、
砂等）を充填し、灰の浸入を防止するものである。Other embodiments of the invention are shown in FIGS. 2 and 3. The purpose of the present invention is to prevent ash from accumulating in the denitrification reactor, and in this embodiment, the space 1 outside the catalyst is
6 to prevent ash from entering. Figure 2 shows
A gas seal filler (rope-shaped heat insulating material) 18 is attached as a gas seal device around the entire circumference of the gap to prevent ash from entering. Fig. 3 shows that the entire space 16 outside the catalyst is filled with one material 18 (insulating material, ash,
sand, etc.) to prevent ash from entering.
本実施例の効果は、インナーケーシング１１と触媒ケー
シング１２の隙間をシールすることにより、反応器内に
灰が堆積することを防止する効果がある。The effect of this embodiment is that by sealing the gap between the inner casing 11 and the catalyst casing 12, it is possible to prevent ash from accumulating in the reactor.
本発明によれば、排ガスに同伴されてきた灰は、すべて
反応装置出口に排出することができるので、灰が反応装
置内に堆積することがなく、点検時の未燃灰の発火事故
を防止する効果がある。また、反応装置全体の熱的条件
を均一にすることができるので、局部的な熱変形による
ひずみを防止する効果がある。According to the present invention, all the ash entrained in the exhaust gas can be discharged to the outlet of the reactor, so ash does not accumulate inside the reactor, thereby preventing ignition accidents of unburned ash during inspections. It has the effect of Furthermore, since the thermal conditions of the entire reactor can be made uniform, there is an effect of preventing distortion due to local thermal deformation.
第１図は、本発明の一実施例を示す脱硝反応装置の説明
図、第２図および第３図は、本発明の他の実施例を示す
脱硝反応装置の一部説明図、第４図は、脱硝反応装置を
備えたボイラ装置の系統図、第５図および第６図は、従
来技術の脱硝反応装置の説明図である。
３・・・脱硝反応器、４・・・触媒、６・・・出口煙道
、７・・・鉄骨、８・・・外部ケーシング、９・・・入
口煙道、１０・・・触媒架台、１１・・・インナープレ
ート、１２・・・触媒ケーシング、１３・・・排ガスガ
イド、１４・・・入口ガス、１５・・・反応器底部開口
部、１６・・・触媒外側の空間スペース、１７・・・灰
抜出口。
代理人 弁理士 川 北 武 長
第１図
１／
３：脱硝反応器
４：触媒
ゴ５：反応器底部開口部
】６：触媒外側空間スペース
】７：灰抜出し口
１８：ガヌンール用充填材FIG. 1 is an explanatory diagram of a denitrification reactor showing one embodiment of the present invention, FIGS. 2 and 3 are partial explanatory diagrams of a denitrification reactor showing another embodiment of the present invention, and FIG. 1 is a system diagram of a boiler apparatus equipped with a denitrification reaction apparatus, and FIGS. 5 and 6 are explanatory diagrams of conventional denitrification reaction apparatuses. 3... Denitrification reactor, 4... Catalyst, 6... Outlet flue, 7... Steel frame, 8... External casing, 9... Inlet flue, 10... Catalyst mount, DESCRIPTION OF SYMBOLS 11... Inner plate, 12... Catalyst casing, 13... Exhaust gas guide, 14... Inlet gas, 15... Reactor bottom opening, 16... Space outside catalyst, 17... ...Ash extraction exit. Agent Patent Attorney Takenaga Kawakita Figure 1 1/3: Denitrification reactor 4: Catalyst 5: Reactor bottom opening] 6: Catalyst outer space space] 7: Ash outlet 18: Filler for Ganunur
Claims (1)
と、導入された排ガスを処理して排ガス中の窒素酸化物
を除去する脱硝反応器と、処理後の排ガスを排出する出
口煙道とを有する脱硝反応装置において、脱硝反応器は
触媒を収納した触媒ケーシングと、触媒ケーシングを支
える架台と、触媒ケーシングを所定の空間スペースを隔
てて収容し、かつ入口煙道および出口煙道と接続された
外部ケーシングと、外部ケーシングと触媒ケーシングと
の間に設けられ、排ガスを触媒に導く排ガスガイドとよ
りなり、外部ケーシングと触媒ケーシングの間の空間ス
ペースの底部には、排ガス煙道に通じる開口部を設けた
ことを特徴とする脱硝反応装置。(1) An inlet flue that introduces exhaust gas containing nitrogen oxides, a denitrification reactor that processes the introduced exhaust gas and removes nitrogen oxides from the exhaust gas, and an outlet flue that discharges the treated exhaust gas. In the denitrification reactor, the denitrification reactor has a catalyst casing that houses a catalyst, a pedestal that supports the catalyst casing, and a frame that houses the catalyst casing with a predetermined space between them and is connected to an inlet flue and an outlet flue. an exhaust gas guide provided between the external casing and the catalyst casing to guide the exhaust gas to the catalyst, and an opening leading to the exhaust gas flue at the bottom of the space between the external casing and the catalyst casing. A denitrification reaction device characterized by having a section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63134677A JP2648613B2 (en) | 1988-06-01 | 1988-06-01 | DeNOx reaction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63134677A JP2648613B2 (en) | 1988-06-01 | 1988-06-01 | DeNOx reaction equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01304030A true JPH01304030A (en) | 1989-12-07 |
| JP2648613B2 JP2648613B2 (en) | 1997-09-03 |
Family
ID=15133988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63134677A Expired - Fee Related JP2648613B2 (en) | 1988-06-01 | 1988-06-01 | DeNOx reaction equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2648613B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361074A (en) * | 2001-06-12 | 2002-12-17 | Babcock Hitachi Kk | Reactor for exhaust gas denitration apparatus |
| CN114887477A (en) * | 2022-05-17 | 2022-08-12 | 广东国鑫实业股份有限公司 | Denitration system of sintering machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092855A (en) * | 1973-12-21 | 1975-07-24 |
-
1988
- 1988-06-01 JP JP63134677A patent/JP2648613B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5092855A (en) * | 1973-12-21 | 1975-07-24 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361074A (en) * | 2001-06-12 | 2002-12-17 | Babcock Hitachi Kk | Reactor for exhaust gas denitration apparatus |
| CN114887477A (en) * | 2022-05-17 | 2022-08-12 | 广东国鑫实业股份有限公司 | Denitration system of sintering machine |
| CN114887477B (en) * | 2022-05-17 | 2023-08-22 | 广东国鑫实业股份有限公司 | Sintering machine denitration system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2648613B2 (en) | 1997-09-03 |
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