JP2002177733A - Waste gas denitration apparatus - Google Patents
Waste gas denitration apparatusInfo
- Publication number
- JP2002177733A JP2002177733A JP2000379702A JP2000379702A JP2002177733A JP 2002177733 A JP2002177733 A JP 2002177733A JP 2000379702 A JP2000379702 A JP 2000379702A JP 2000379702 A JP2000379702 A JP 2000379702A JP 2002177733 A JP2002177733 A JP 2002177733A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- ammonia
- waste gas
- temperature
- heat exchanger
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種の炉から発生
した高温の排ガス中からＮＯxを除去する排ガス脱硝装
置に関するものである。The present invention relates to relates to an exhaust gas denitration apparatus for removing NO x from the hot flue gas generated from a variety of furnace.
【０００２】[0002]
【従来の技術】バーナーを備えた加熱炉、焼成炉等の炉
から発生する排ガス中には、大気汚染の原因となるＮＯ
xが含まれていることが多い。このため、図３に示すよ
うに排ガスの煙道１に設けたアンモニア噴出手段２から
アンモニアを吹き込んでＮＯxを窒素ガスに還元し、脱
硝する装置が従来から知られている。ところが、煙道１
中におけるアンモニアの高温滞留時間は極めて短いため
に排ガスとの間で十分な反応を行わせることができず、
一般にこの装置による脱硝率は３０〜５０％程度に過ぎ
なかった。2. Description of the Related Art Exhaust gas generated from a furnace such as a heating furnace or a baking furnace having a burner contains NO, which causes air pollution.
It often contains x . For this reason, as shown in FIG. 3, there has been conventionally known an apparatus which blows ammonia from an ammonia jetting means 2 provided in an exhaust gas flue 1 to reduce NO x into nitrogen gas and denitrate. However, flue 1
Since the high-temperature residence time of ammonia in the air is extremely short, sufficient reaction with the exhaust gas cannot be performed,
Generally, the denitration rate by this apparatus was only about 30 to 50%.
【０００３】また、従来は煙道１に吹き込まれたアンモ
ニアが排ガスと十分に攪拌されないままで排出され、作
業環境の悪化を招くおそれもあるうえ、排ガス温度が変
動して１０００℃以上になると吹き込まれたアンモニア
が熱分解してＮＯxとなり、脱硝するために吹き込まれ
たアンモニアが却って排ガス中のＮＯxを増加させる危
険性さえあった。Conventionally, the ammonia blown into the flue 1 is discharged without being sufficiently stirred with the exhaust gas, which may deteriorate the working environment. NO x becomes ammonia is thermally decomposed, ammonia blown to denitration was even risk of rather increasing the NO x in the exhaust gas.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、排ガス中のＮＯxを確実に除去する
ことができるとともに、排ガスからの熱回収をも行うこ
とができる排ガス脱硝装置を提供するためになされたも
のである。[Invention is to Solve An object of the present invention is to solve the conventional problems described above, it is possible to reliably remove the NO x in the exhaust gas, the exhaust gas denitration can be performed even the heat recovery from the exhaust gas It was made to provide a device.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の排ガス脱硝装置は、炉から発生し
た高温の排ガスが流れる煙道に回転再生式熱交換器を設
置するとともに、その排ガス入り側にアンモニア噴出手
段を設けたことを特徴とするものである。なおアンモニ
ア噴出手段を、回転再生式熱交換器の排ガス入り側の温
度制御された流路に設けることが好ましく、特に反応に
適した８００〜９５０℃に温度制御された流路に設ける
ことが好ましい。SUMMARY OF THE INVENTION An exhaust gas denitration apparatus of the present invention made to solve the above-mentioned problems is provided with a rotary regenerative heat exchanger installed in a flue through which high-temperature exhaust gas generated from a furnace flows. It is characterized in that ammonia exhaust means is provided on the exhaust gas inlet side. In addition, it is preferable to provide the ammonia jetting means in a temperature-controlled channel on the exhaust gas inlet side of the rotary regenerative heat exchanger, and it is particularly preferable to provide the ammonia jetting device in a temperature-controlled channel suitable for reaction at 800 to 950 ° C. .
【０００６】本発明の排ガス脱硝装置によれば、回転再
生式熱交換器の排ガス入り側にアンモニア噴出手段を設
けたので、アンモニアは回転再生式熱交換器の内部で排
ガスと十分に攪拌される。このために非常に高い脱硝率
を実現することができるとともに、高温の排ガスからの
熱回収も可能となる。また未反応のアンモニアが排出さ
れることもない。さらにアンモニア噴出手段を排ガス入
り側の温度制御された流路に設けることにより、アンモ
ニアが熱分解してＮＯxとなることも防止することがで
きる。According to the exhaust gas denitration apparatus of the present invention, since the ammonia rejecting means is provided on the exhaust gas inlet side of the rotary regenerative heat exchanger, ammonia is sufficiently stirred with the exhaust gas inside the rotary regenerative heat exchanger. . For this reason, a very high denitration rate can be realized, and heat recovery from high-temperature exhaust gas is also possible. Unreacted ammonia is not discharged. Further ammonia ejection means by providing a flow path which is temperature control of the exhaust gas entry side, ammonia can be prevented that the NO x is thermally decomposed.
【０００７】[0007]
【発明の実施の形態】以下に本発明の好ましい実施形態
を示す。図１において、１０は例えば鋼片加熱炉等の炉
であり、多数のバーナー１１を備えてＮＯxを含む高温
の排ガスを発生させている。この排ガスを煙突１２に導
くための煙道１３には、高温の排ガスから廃熱回収を行
うための回転再生式熱交換器１４が設置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. 1, 10 is for example, a furnace such as a steel strip heating furnace, thereby generating high-temperature exhaust gas containing NO x comprises a number of burners 11. A rotary regeneration heat exchanger 14 for recovering waste heat from high-temperature exhaust gas is installed in a flue 13 for guiding the exhaust gas to a chimney 12.
【０００８】この回転再生式熱交換器１４は、図２に模
式的に示すように円筒状のケーシング１５の内部に数ｒ
ｐｍで低速回転するローター１６を設けたものであり、
ローター１６には波板鋼板等からなる蓄熱体が取付けら
れ、蓄熱体間に狭いガス流路を形成している。ガス流路
の方向は回転軸１７と平行であり、ケーシング１５は回
転軸１７を通る直径線上に設けられたセクタープレート
により２分割されている。As shown schematically in FIG. 2, the rotary regenerative heat exchanger 14 has several r inside a cylindrical casing 15.
pm, and a rotor 16 that rotates at a low speed is provided.
A heat storage body made of a corrugated steel plate or the like is attached to the rotor 16 to form a narrow gas flow path between the heat storage bodies. The direction of the gas flow path is parallel to the rotation shaft 17, and the casing 15 is divided into two by a sector plate provided on a diameter line passing through the rotation shaft 17.
【０００９】図１に示すように高温の排ガスをケーシン
グ１５の片側の流路から流し、燃焼ブロワから供給され
る空気をケーシング１５の他方の流路に流すと、ロータ
ー１６の蓄熱体は狭いガス流路を流れる高温の排ガスに
より加熱され、この部分が回転して空気流路側に達した
ときには狭い流路を流れる燃焼空気を加熱する。このよ
うにして排ガスからの熱回収が行われ、加熱された空気
はバーナー１１の燃焼用空気として利用される。As shown in FIG. 1, when high-temperature exhaust gas flows from one flow path of the casing 15 and air supplied from the combustion blower flows to the other flow path of the casing 15, the heat storage body of the rotor 16 has a narrow gas storage. Heated by the high-temperature exhaust gas flowing through the flow path, when this part rotates and reaches the air flow path side, the combustion air flowing through the narrow flow path is heated. In this way, heat is recovered from the exhaust gas, and the heated air is used as combustion air for the burner 11.
【００１０】本発明では、この回転再生式熱交換器１４
の排ガス入り側に、アンモニア噴出手段１８を設ける。
このアンモニア噴出手段１８は排ガス中にアンモニアガ
ス又はアンモニア水を噴出するものである。その設置位
置は回転再生式熱交換器１４の前段であればよいが、特
に回転再生式熱交換器１４の排ガス入り側の温度制御さ
れた流路部分に設けることが好ましい。In the present invention, the rotary regenerative heat exchanger 14
Ammonia ejection means 18 is provided on the side of the exhaust gas.
The ammonia jetting means 18 jets ammonia gas or aqueous ammonia into exhaust gas. The installation position may be any position before the rotary regenerative heat exchanger 14, but it is particularly preferably provided in a temperature-controlled flow path portion on the exhaust gas entry side of the rotary regenerative heat exchanger 14.
【００１１】この温度制御は、炉１０の燃焼状態の変動
により排ガス温度が回転再生式熱交換器１４の許容範囲
を超えて上昇しないようにするためのものであり、その
方法は任意であるが、この実施形態では希釈ブロワ１９
から供給される希釈空気をノズル２０から排ガス中に吹
き込む方法が採用されている。これにより回転再生式熱
交換器１４の排ガス入り側の温度制御された流路では、
温度センサ２１により検出される排ガス温度が常に８０
０〜９５０℃に維持されている。この温度域の部分にア
ンモニア噴出手段１８を設置すれば、アンモニアは熱分
解することはなく、また高い脱硝反応効率を発揮させる
ことができる。This temperature control is for preventing the exhaust gas temperature from exceeding the allowable range of the rotary regenerative heat exchanger 14 due to fluctuations in the combustion state of the furnace 10, and any method may be used. In this embodiment, the dilution blower 19 is used.
A method of blowing dilution air supplied from a nozzle 20 into exhaust gas from the nozzle 20 is adopted. Thus, in the temperature-controlled flow path on the exhaust gas entry side of the rotary regeneration heat exchanger 14,
The exhaust gas temperature detected by the temperature sensor 21 is always 80
It is maintained at 0-950 ° C. If the ammonia jetting means 18 is provided in this temperature range, the ammonia does not thermally decompose and high denitration reaction efficiency can be exhibited.
【００１２】このように構成された本発明の排ガス脱硝
装置においては、炉１０から排出された高温の排ガスは
８００〜９５０℃に温度調整されたうえ回転再生式熱交
換器１４に入り熱回収が行われるのであるが、その排ガ
ス入り側においてアンモニア噴出手段１８からアンモニ
アが噴出される。排ガスはアンモニアとともに回転再生
式熱交換器１４のロータ−１６内部の狭いガス流路を通
過する間に、ローター１６の回転によって攪拌される。
またローター１６の蓄熱体には波板加工等の流れを乱す
構造が採用されているので、これによっても十分に攪拌
される。In the exhaust gas denitration apparatus of the present invention thus constructed, the temperature of the high-temperature exhaust gas discharged from the furnace 10 is adjusted to 800 to 950 ° C., and then enters the rotary regenerative heat exchanger 14 where heat is recovered. The ammonia is ejected from the ammonia ejecting means 18 on the exhaust gas entry side. The exhaust gas is stirred by the rotation of the rotor 16 while passing through the narrow gas flow path inside the rotor 16 of the rotary regenerative heat exchanger 14 together with the ammonia.
In addition, since a structure that disturbs the flow such as corrugated sheet processing is adopted as the heat storage body of the rotor 16, the stirring is also sufficiently performed by this.
【００１３】このため、脱硝反応に十分な温度、滞留時
間、攪拌性が確保され、排ガス中のＮＯxはローター１
６を通過する間にアンモニアとの反応によって十分に除
去される。その結果、本発明によれば従来は４０％程度
であった脱硝率を８５％程度まで大幅に向上させること
が可能となった。また、従来は煙突から排出される排ガ
ス中に未反応の５０ｐｐｍ程度のアンモニアが検出され
ることがあったが、本発明によれば回転再生式熱交換器
１４の内部で十分な攪拌が行われる完全に反応するの
で、煙突から排出される排ガス中のアンモニア濃度は０
ｐｐｍとなる。Therefore, sufficient temperature, residence time, and agitation property for the denitration reaction are secured, and NO x in the exhaust gas is reduced by the rotor 1.
While passing through 6, it is sufficiently removed by reaction with ammonia. As a result, according to the present invention, the denitration rate, which was about 40% in the past, can be greatly improved to about 85%. Conventionally, unreacted ammonia of about 50 ppm was sometimes detected in exhaust gas discharged from the chimney. However, according to the present invention, sufficient stirring is performed inside the rotary regenerative heat exchanger 14. Since it completely reacts, the ammonia concentration in the exhaust gas discharged from the chimney is 0
ppm.
【００１４】なお、排ガスの性状によってはローター１
６にアンモニアとの反応生成物が付着することがある
が、ローター１６は排ガス側から空気側に回転したとき
に新鮮な空気によって常に逆洗されることとなるため、
ローター１６の表面から反応生成物は容易に除去され、
熱交換の支障となることはない。Incidentally, depending on the properties of the exhaust gas, the rotor 1
Reaction products with ammonia may adhere to 6, but when the rotor 16 rotates from the exhaust gas side to the air side, it is always backwashed by fresh air,
Reaction products are easily removed from the surface of the rotor 16,
There is no hindrance to heat exchange.
【００１５】また、ローター１６の蓄熱体に脱硝触媒
（例えば酸化チタン、酸化バナジウム、白金など）を担
持させておけば、より優れた脱硝効果を得ることができ
ることはいうまでもない。Further, if a denitration catalyst (for example, titanium oxide, vanadium oxide, platinum, etc.) is supported on the heat storage body of the rotor 16, it goes without saying that a more excellent denitration effect can be obtained.
【００１６】[0016]
【発明の効果】以上に説明したように、本発明の排ガス
脱硝装置は回転再生式熱交換器の排ガス入り側にアンモ
ニア噴出手段を設け、ローターの内部を通過する間に十
分に脱硝反応を行わせるようにしたものであるから、炉
から排出される高温の排ガス中のＮＯxを確実に除去す
ることができる。また従来と同様に高温の排ガスからの
熱回収をも行うことができることはいうまでもない。な
お、本発明においては既存の回転再生式熱交換器をその
まま使用することができ、設備コストも安価でよいとい
う利点もある。As described above, in the exhaust gas denitration apparatus of the present invention, the ammonia rejecting means is provided on the exhaust gas inlet side of the rotary regenerative heat exchanger, and the denitration reaction is sufficiently performed while passing through the inside of the rotor. was because it intended to cause, it is possible to reliably remove the NO x in the high temperature in the exhaust gas discharged from the furnace. Needless to say, heat can be recovered from high-temperature exhaust gas as in the conventional case. In the present invention, there is an advantage that the existing rotary regeneration heat exchanger can be used as it is, and the equipment cost can be reduced.
【図１】本発明の実施形態を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
【図２】回転再生式熱交換器の構造を説明する模式的な
断面図である。FIG. 2 is a schematic sectional view illustrating the structure of a rotary regeneration heat exchanger.
【図３】従来の排ガス脱硝装置を示す説明図である。FIG. 3 is an explanatory view showing a conventional exhaust gas denitration apparatus.
１ 煙道 ２ アンモニア噴出手段 １０ 炉 １１ バーナー １２ 煙突 １３ 煙道 １４ 回転再生式熱交換器 １５ ケーシング １６ ローター １７ 回転軸 １８ アンモニア噴出手段 １９ 希釈ブロワ ２０ ノズル ２１ 温度センサ DESCRIPTION OF SYMBOLS 1 Flue 2 Ammonia ejection means 10 Furnace 11 Burner 12 Chimney 13 Flue 14 Rotary regenerative heat exchanger 15 Casing 16 Rotor 17 Rotation axis 18 Ammonia ejection means 19 Dilution blower 20 Nozzle 21 Temperature sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹口 健一 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 Ｆターム(参考） 3K023 QA03 QA04 QA06 QA07 QA08 QA11 QA14 QB00 QC08 SA01 3K070 DA02 DA14 DA53 DA83 4D002 AA12 AC02 AC03 AC04 BA06 BA13 CA01 DA07 EA02 GA01 GB03 HA08 4D048 AA06 AB02 AC04 BA07X BA13X BA23X BA30X BA41X BB03 CB05 CC54 CC61 DA03 DA06 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Takeguchi 5-3 Tokaicho, Tokai-shi, Aichi F-term in Nippon Steel Corporation Nagoya Works (reference) 3K023 QA03 QA04 QA06 QA07 QA08 QA11 QA14 QB00 QC08 SA01 3K070 DA02 DA14 DA53 DA83 4D002 AA12 AC02 AC03 AC04 BA06 BA13 CA01 DA07 EA02 GA01 GB03 HA08 4D048 AA06 AB02 AC04 BA07X BA13X BA23X BA30X BA41X BB03 CB05 CC54 CC61 DA03 DA06
Claims (3)
道に回転再生式熱交換器を設置するとともに、その排ガ
ス入り側にアンモニア噴出手段を設けたことを特徴とす
る排ガス脱硝装置。1. An exhaust gas denitration apparatus comprising: a rotary regenerative heat exchanger installed in a flue through which a high-temperature exhaust gas generated from a furnace flows, and an ammonia jetting means provided on an exhaust gas inlet side thereof.
換器の排ガス入り側の温度制御された流路に設けた請求
項１に記載の排ガス脱硝装置。2. The exhaust gas denitration apparatus according to claim 1, wherein the ammonia jetting means is provided in a temperature-controlled flow passage on the exhaust gas inlet side of the rotary regeneration type heat exchanger.
℃に温度制御された流路に設けた請求項２に記載の排ガ
ス脱硝装置。3. The method according to claim 1, wherein the means for ejecting ammonia is 800 to 950.
3. The exhaust gas denitration apparatus according to claim 2, wherein the exhaust gas denitration apparatus is provided in a flow path whose temperature is controlled to ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379702A JP2002177733A (en) | 2000-12-14 | 2000-12-14 | Waste gas denitration apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000379702A JP2002177733A (en) | 2000-12-14 | 2000-12-14 | Waste gas denitration apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002177733A true JP2002177733A (en) | 2002-06-25 |
Family
ID=18848017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000379702A Pending JP2002177733A (en) | 2000-12-14 | 2000-12-14 | Waste gas denitration apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002177733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009243854A (en) * | 2008-03-31 | 2009-10-22 | Osaka Gas Co Ltd | Combustion device |
-
2000
- 2000-12-14 JP JP2000379702A patent/JP2002177733A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009243854A (en) * | 2008-03-31 | 2009-10-22 | Osaka Gas Co Ltd | Combustion device |
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