WO2007116602A1 - Flue gas denitration apparatus - Google Patents
Flue gas denitration apparatus Download PDFInfo
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- WO2007116602A1 WO2007116602A1 PCT/JP2007/051994 JP2007051994W WO2007116602A1 WO 2007116602 A1 WO2007116602 A1 WO 2007116602A1 JP 2007051994 W JP2007051994 W JP 2007051994W WO 2007116602 A1 WO2007116602 A1 WO 2007116602A1
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- exhaust gas
- denitration
- ammonia water
- spray nozzle
- tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Definitions
- An object of the present invention is to prevent clogging of an ammonia water spray nozzle in an exhaust gas denitration apparatus due to acidic ammonium sulfate.
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A flue gas denitration apparatus designed to avoid clogging of ammonia water spray nozzle. There is provided a flue gas denitration apparatus comprising bifluid spray nozzle tube (5) for spraying of ammonia water into boiler exhaust gas (G) with the use of a gas and denitration catalyst layer (3) allowing passage of ammonia-containing exhaust gas therethrough and inducing denitration reaction thereof, wherein the bifluid spray nozzle tube (5) is disposed within exterior pipe (8) furnished with an opening for spray passage at a place opposite to ammonia water emitting aperture (11), and wherein the exterior pipe (8) is fitted with cylindrical flow rectifier tube (12) capable of not only supply of purge air but also rectifying the exhaust gas flowing therearound in such a fashion that the axial line thereof is aligned with the direction of flow of exhaust gas (a) and that the flow rectifier tube (12) is concentric with blowout aperture. The inside diameter of the flow rectifier tube (12) is larger than the outside diameter of the exterior pipe (8), and the axial direction length of the flow rectifier tube (12) is larger than the outside diameter of the exterior pipe (8).
Description
明 細 書 Specification
排煙脱硝装置 Flue gas denitration equipment
技術分野 Technical field
[0001] 本発明は、排ガス中にアンモニア水を噴霧して排ガス中の窒素酸ィ匕物を脱硝触媒 により除去する排煙脱硝装置に関する。具体的には、排ガス中に含まれる硫黄酸ィ匕 物とアンモニアとの反応生成物によってアンモニア水の噴霧ノズルが閉塞される問題 を低減して、アンモニア水直接噴霧システムの信頼性を向上し、プラント効率向上に 配慮した排煙脱硝装置に関する。 TECHNICAL FIELD [0001] The present invention relates to a flue gas denitration device that sprays ammonia water into exhaust gas to remove nitrogen oxides in the exhaust gas with a denitration catalyst. Specifically, the problem of clogging of the ammonia water spray nozzle by the reaction product of sulfur oxides and ammonia contained in the exhaust gas is reduced, improving the reliability of the ammonia water direct spray system, The present invention relates to flue gas denitration equipment that takes plant efficiency into consideration.
背景技術 Background art
[0002] 主に発電用ボイラ等に設置される排煙脱硝装置は、ボイラの燃焼排ガス中から窒 素酸化物 (NOx)を除去するために、ボイラ節炭器出口の排ガスダクト中に脱硝反応 の還元剤であるアンモニアを注入し、排ガスと充分な混合後、脱硝触媒上において 脱硝反応を行っている。 [0002] The flue gas denitration equipment installed mainly in power generation boilers, etc. is used for denitration reaction in the exhaust gas duct at the boiler economizer outlet in order to remove nitrogen oxides (NOx) from the combustion exhaust gas of the boiler. After injecting ammonia, which is a reducing agent, and thoroughly mixing with exhaust gas, denitration reaction is performed on the denitration catalyst.
[0003] 近年、液ィ匕アンモニアに比べて保管及び取扱いが容易なことから、アンモニア水が 用いられるケースが多ぐアンモニア水をボイラ節炭器出口の排ガスダクト中へ噴霧 して蒸発させ、蒸発したアンモニアと排ガスとを混合させた後、脱硝反応を行うプラン トが増えている。アンモニア水を排ガス中に噴霧する際には、例えば特許文献 1又は 特許文献 2に示されているように、通常、アンモニア水を噴霧空気により微粒ィ匕してァ ンモユア水の蒸発促進を図るために、二流体噴霧ノズルが用いられる。 [0003] In recent years, it is easier to store and handle compared to liquid ammonia, so ammonia water, which is often used for ammonia water, is sprayed into the exhaust gas duct at the boiler economizer outlet to evaporate and evaporate. There is an increasing number of plants that carry out denitration after mixing ammonia and exhaust gas. When spraying ammonia water into exhaust gas, for example, as shown in Patent Document 1 or Patent Document 2, normally, ammonia water is atomized with spray air to promote evaporation of ammonia water. In addition, a two-fluid spray nozzle is used.
[0004] 例えば、発電用ボイラにおける脱硝装置は、通常、脱硝触媒の性能上 300〜350 °Cの排ガス温度が必要なことから、ボイラ節炭器の後流側に設置される。アンモニア 水を排ガス中に噴霧する際、排ガス中に硫黄酸ィ匕物（以降、 SOxと略す。）が含まれ ていると、噴霧ノズル付近の排ガス中の SOxとアンモニアが反応して、酸性硫酸アン モ -ゥム (以降、酸性硫安という。）が生成される。この酸性硫安の結晶が噴霧ノズル の周辺部において生成されると、噴霧ノズルの詰りを引き起こすことが知られている。 [0004] For example, a denitration device in a power generation boiler is usually installed on the downstream side of a boiler economizer because an exhaust gas temperature of 300 to 350 ° C is required for the performance of a denitration catalyst. When ammonia water is sprayed into the exhaust gas, if sulfur oxides (hereinafter abbreviated as SOx) are contained in the exhaust gas, SOx in the exhaust gas near the spray nozzle reacts with ammonia to react with acidic sulfuric acid. Ammonium (hereinafter referred to as acidic ammonium sulfate) is produced. It is known that the formation of acid ammonium sulfate crystals in the periphery of the spray nozzle causes clogging of the spray nozzle.
[0005] そこで、従来は、二流体噴霧ノズルを外装管で覆ってパージ空気を流し、ノズルの 噴出孔に対向する外装管の管壁に設けた孔力 パージ空気と共にアンモニア水を
噴霧する構造が採用されている。これによれば、ノズル部へ硫黄分含有排ガスが直 接触れることを防止して、酸性硫安の生成及び付着を抑制することができる。さらに、 パージ空気を電気ヒータ等により 100°C以上に加熱することにより酸性硫安の析出を 回避して、プラントの信頼'性確保を図ってきた。 [0005] Therefore, conventionally, a two-fluid spray nozzle is covered with an outer tube and purge air is flowed, and ammonia water is supplied together with a purge force purge air provided on the tube wall of the outer tube facing the nozzle ejection hole. A spraying structure is adopted. According to this, it is possible to prevent the sulfur-containing exhaust gas from coming into direct contact with the nozzle portion, thereby suppressing the generation and adhesion of acidic ammonium sulfate. In addition, by heating the purged air to 100 ° C or higher with an electric heater, etc., precipitation of acidic ammonium sulfate was avoided to ensure plant reliability.
[0006] 特許文献 1 :特許第 3295419号 [0006] Patent Document 1: Japanese Patent No. 3295419
特許文献 2 :特開平 11— 333252号公報 しかし、通常、偏流が生じた排ガス中にァ ンモユア水を噴霧した場合、この偏流の影響を受けた噴霧箇所下流ではアンモニア 水が均等に分散されないため、アンモニア水がそのまま蒸発すると排ガス中のアンモ ニァ濃度の偏りが生じ、脱硝装置の性能低下等の問題が生じる。 Patent Document 2: JP-A-11-333252 However, when ammonia water is normally sprayed into the exhaust gas in which a drift has occurred, the ammonia water is not evenly dispersed downstream of the spray location affected by the drift. If the ammonia water evaporates as it is, the ammonia concentration in the exhaust gas will be biased, causing problems such as reduced performance of the denitration device.
[0007] このような排ガス偏流低減のために、噴霧ノズル上流にバッフルプレート等の設置 が検討されている。しかし、ノ ッフルプレートの下流に発生する乱流の影響により、ノ ズルカ 噴霧されたアンモニア水が蒸発する前に乱流に巻込まれ、アンモニア水を 含む排ガスが逆流して二流体噴霧ノズルにアンモニア水が付着し、排ガス中の SOx と反応して酸性硫安が生成され、これによりノズル部が閉塞されるおそれがある。 [0007] In order to reduce such an exhaust gas drift, installation of a baffle plate or the like is being considered upstream of the spray nozzle. However, due to the influence of the turbulent flow that occurs downstream of the kaffle plate, the ammonia water sprayed by Nozulka gets caught up in the turbulent flow before it evaporates, and the exhaust gas containing ammonia water flows backward, causing the ammonia water to flow into the two fluid spray nozzle It adheres and reacts with SOx in the exhaust gas to produce acidic ammonium sulfate, which may clog the nozzle part.
[0008] また、ノ ッフルプレートの影響を受けて、二流体噴霧ノズルの周辺部に充分な排ガ スが供給されないことから、アンモニア水の蒸発に時間を要し、結果として脱硝触媒 までの距離が長くなるので、設置上の制約が有る。 [0008] In addition, since sufficient exhaust gas is not supplied to the periphery of the two-fluid spray nozzle due to the influence of the kaffle plate, it takes time to evaporate the ammonia water, resulting in a distance to the denitration catalyst. Since it becomes longer, there are restrictions on installation.
発明の開示 Disclosure of the invention
[0009] 本発明は、排煙脱硝装置におけるアンモニア水噴霧ノズルの酸性硫安による閉塞 を防止することを課題とする。 [0009] An object of the present invention is to prevent clogging of an ammonia water spray nozzle in an exhaust gas denitration apparatus due to acidic ammonium sulfate.
[0010] 上記の課題を解決するため、本発明の排煙脱硝装置は、ボイラ排ガス中に気体を 用いてアンモニア水を噴霧する噴出孔を有する二流体噴霧ノズル管と、アンモニアを 含む排ガスを通過させて脱硝反応を行わせる脱硝触媒層とを有してなり、前記二流 体噴霧ノズル管は、前記噴出孔に対向する箇所に噴霧を通過させる開口を備えた 外装管に内装され、前記外装管には、パージ空気が供給されるとともにその周囲を 流れる排ガスを整流する整流管が装着されていることを特徴とする。 [0010] In order to solve the above problems, a flue gas denitration apparatus of the present invention passes through a two-fluid spray nozzle tube having a jet hole for spraying ammonia water using gas in boiler exhaust gas, and exhaust gas containing ammonia. And a denitration catalyst layer for performing a denitration reaction, wherein the two-stream spray nozzle tube is provided in an exterior tube having an opening that allows spray to pass through a portion facing the ejection hole, and the exterior tube Is equipped with a rectifier pipe that supplies purge air and rectifies the exhaust gas flowing around it.
[0011] このような特徴を有することにより、ボイラ出口からの排ガスは、二流体噴霧ノズル管 を覆う外装管に設置された整流管により整流され、二流体噴霧ノズルカゝらアンモニア
水が噴霧されるから、排ガス中に噴霧されたアンモニア水は整流された排ガス中にて 蒸発され、下流の脱硝触媒層へと流れる。特に、二流体噴霧ノズルの噴出孔の近傍 に排ガスの逆流を抑制することができるから、二流体噴霧ノズルに酸性硫安が付着し てアンモニア水噴霧ノズルが閉塞されるのを防止することができる。 [0011] By having such a feature, the exhaust gas from the boiler outlet is rectified by a rectifying pipe installed in an exterior pipe covering the two-fluid spray nozzle pipe, and the two-fluid spray nozzle and the ammonia are rectified. Since water is sprayed, the ammonia water sprayed into the exhaust gas is evaporated in the rectified exhaust gas and flows to the downstream denitration catalyst layer. In particular, since the backflow of exhaust gas can be suppressed in the vicinity of the ejection hole of the two-fluid spray nozzle, it is possible to prevent clogging of the ammonia water spray nozzle due to acid ammonium sulfate adhering to the two-fluid spray nozzle.
[0012] また、二流体噴霧ノズル周辺に十分な高温の排ガスを供給できるから、短時間での アンモニア水蒸発が可能となり、アンモニア水直接噴霧システム設置におけるスぺー ス制約問題を解消できる。 [0012] Further, since a sufficiently high temperature exhaust gas can be supplied around the two-fluid spray nozzle, ammonia water can be evaporated in a short time, and the space restriction problem in installing the ammonia water direct spray system can be solved.
図面の簡単な説明 Brief Description of Drawings
[0013] [図 1]本発明の第 1の実施の形態に係る排煙脱硝装置の断面図である。 FIG. 1 is a cross-sectional view of a flue gas denitration apparatus according to a first embodiment of the present invention.
[図 2]本発明の第 2の実施の形態に係る排煙脱硝装置の断面図である。 FIG. 2 is a cross-sectional view of a flue gas denitration apparatus according to a second embodiment of the present invention.
発明を実施するための最良の形態 BEST MODE FOR CARRYING OUT THE INVENTION
[0014] (第 1の実施の形態） 以下に本発明の排煙脱硝装置の第 1の実施の形態を、図 1を 用いて説明する。排煙脱硝装置 1は、図 1 (A)に示すように、ボイラ節炭器出口から 排ガス Gが流入される脱硝装置入口ダクト 2と、脱硝装置入口ダクト 2に接続され、脱 硝触媒を内装した脱硝触媒層 3と、脱硝装置入口ダクト 2に内装されたアンモニア注 入装置 4と、脱硝触媒層 3の出口に設けられた図示されていない NOx分析計と、を 含んで構成されている。 First Embodiment Hereinafter, a first embodiment of a flue gas denitration apparatus of the present invention will be described with reference to FIG. As shown in Fig. 1 (A), the flue gas denitration device 1 is connected to the denitration device inlet duct 2 through which the exhaust gas G flows from the boiler economizer outlet, and the denitration device inlet duct 2, and is equipped with a denitration catalyst. The denitration catalyst layer 3, the ammonia injection device 4 built in the denitration device inlet duct 2, and a NOx analyzer (not shown) provided at the outlet of the denitration catalyst layer 3 are configured.
[0015] アンモニア注入装置 4は、脱硝触媒層 3の入口側の脱硝装置入口ダクト 2の壁面を 貫通して、その軸線が、排ガス Gの流れに直交するように、かつ先端部を脱硝装置入 口ダクト 2内に位置させて設けられた複数の二流体噴霧ノズル管 5を備えて構成され ている。 [0015] The ammonia injection device 4 passes through the wall surface of the denitration device inlet duct 2 on the inlet side of the denitration catalyst layer 3 so that the axis thereof is orthogonal to the flow of the exhaust gas G, and the tip portion enters the denitration device. A plurality of two-fluid spray nozzle tubes 5 are provided so as to be positioned in the mouth duct 2.
[0016] 二流体噴霧ノズル管 5は、図 1 (A) , (B)に示すように、それぞれ、小径の内管 6と、 内管 6を包囲して同軸に設けられた外管 7とを備えて構成されている。二流体噴霧ノ ズル管 5は、さらに外装管 8で同軸に覆って形成されている。外装管 8の先端部の管 壁には、排ガス Gの流れの下流側に向けて開口 9が形成されている。外管 7の先端は 閉塞され、先端部の管壁に外装管 8の開口 9に臨ませて開口 10が設けられている。 内管 6の先端は外管 7の開口 10に向けて曲折されて、アンモニア水の噴出孔 11が 形成されている。噴出孔 11は、外管 7の開口 10から突出させて、かつ、外装管 8の開
口 9よりも手前に位置させて設けられている。また、外装管 8の先端部には、円筒状の 整流管 12が取付けられている。整流管 12は、円筒軸を外装管 8の開口 9の開口軸 に一致させて、つまり円筒軸を脱硝装置入口ダクト 2の軸に平行にして設けられてい る。 As shown in FIGS. 1 (A) and 1 (B), the two-fluid spray nozzle pipe 5 includes a small-diameter inner pipe 6 and an outer pipe 7 surrounding the inner pipe 6 and provided coaxially. It is configured with. The two-fluid spray nozzle tube 5 is further formed so as to be coaxially covered with an outer tube 8. An opening 9 is formed in the tube wall at the tip of the outer tube 8 toward the downstream side of the flow of the exhaust gas G. The distal end of the outer tube 7 is closed, and an opening 10 is provided on the tube wall at the distal end so as to face the opening 9 of the outer tube 8. The tip of the inner pipe 6 is bent toward the opening 10 of the outer pipe 7 to form an ammonia water ejection hole 11. The ejection hole 11 protrudes from the opening 10 of the outer tube 7 and opens the outer tube 8. It is located in front of the mouth 9. A cylindrical rectifier tube 12 is attached to the distal end portion of the outer tube 8. The rectifying pipe 12 is provided such that the cylindrical axis coincides with the opening axis of the opening 9 of the outer pipe 8, that is, the cylindrical axis is parallel to the axis of the denitration apparatus inlet duct 2.
[0017] ここで、外装管 8の開口 9は、噴出孔 11からのアンモニア水の噴霧を妨げるおそれ のない大きさの円形開口であり、開口 9の直径は、排ガス Gの流れに直交する平面に 投影したとき、外装管 8の直径より小さぐ外管 7の直径よりも大きくしてある。整流管 1 2の内径は外装管 8の外径よりも大きぐその軸線方向の長さは、外装管 8の外径より も大きくしてある。つまり、整流管 12の上流端は外装管 8の外周面の上流端よりも上 流側に位置し、整流管 12の下流端は外装管 8の外周面の下流端よりも下流側に位 置している。なお、外装管 8は整流管 12の一方の壁面を貫通し、その先端は、整流 管 12の他方の壁面の内周面に固着されている。 Here, the opening 9 of the outer tube 8 is a circular opening having a size that does not prevent the spraying of ammonia water from the ejection hole 11, and the diameter of the opening 9 is a plane orthogonal to the flow of the exhaust gas G. The diameter of the outer tube 7 that is smaller than the diameter of the outer tube 8 is larger than that of the outer tube 8. The inner diameter of the rectifying pipe 12 is larger than the outer diameter of the outer tube 8, and the axial length thereof is larger than the outer diameter of the outer tube 8. That is, the upstream end of the rectifying pipe 12 is positioned upstream of the upstream end of the outer peripheral surface of the outer tube 8, and the downstream end of the rectifying pipe 12 is positioned downstream of the downstream end of the outer peripheral surface of the outer tube 8. is doing. The outer tube 8 passes through one wall surface of the rectifying tube 12, and the tip thereof is fixed to the inner peripheral surface of the other wall surface of the rectifying tube 12.
[0018] また、アンモニア注入装置 4の内管 6、外管 7、外装管 8の他端は、脱硝装置入口ダ タト 2の外部に引出され、それぞれアンモニア水配管 13、噴霧空気配管 14、パージ 空気配管 15に連結されている。パージ空気配管 15には、図示していないボイラ押込 み空気ファンからの一部の空気、若しくは専用ファン等力も送られる空気を、図示さ れて 、な 、加熱手段により 100°C以上に加熱して、パージ空気として供給されて 、る [0018] Further, the other ends of the inner pipe 6, the outer pipe 7 and the outer pipe 8 of the ammonia injection device 4 are drawn to the outside of the denitration device inlet dart 2 and are respectively an ammonia water pipe 13, an atomizing air pipe 14, and a purge. It is connected to the air pipe 15. In the purge air pipe 15, a part of air from a boiler push-in air fan (not shown) or air that is also sent by a dedicated fan or the like is heated to 100 ° C or higher by a heating means. Supplied as purge air
[0019] このように構成される実施形態の排煙脱硝装置の動作について、次に説明する。 Next, the operation of the flue gas denitration apparatus of the embodiment configured as described above will be described.
アンモニア注入装置 4を運転すると、アンモニア水配管 13から供給されるアンモニア 水は内管 6を通って噴出孔 11に至り、噴霧空気配管 14力も外管 7を介して開口 10 から吹出される噴霧空気と共に、外装管 8の開口 9を通して排ガス中に噴霧される。 When the ammonia injection device 4 is operated, the ammonia water supplied from the ammonia water pipe 13 passes through the inner pipe 6 to the ejection hole 11, and the atomizing air pipe 14 force is also sprayed air blown out from the opening 10 through the outer pipe 7. At the same time, it is sprayed into the exhaust gas through the opening 9 of the outer tube 8.
[0020] 排ガス中に噴霧されたアンモニア水は、排ガスの熱によって蒸発しながら脱硝触媒 層 3に流入して、脱硝触媒上でアンモニアを還元剤として脱硝反応が行われる。ここ で、アンモニア注入装置 4のアンモニア水の噴霧位置力も脱硝触媒層 3までの距離 は、噴霧されたアンモニア水が十分に蒸発する距離に設定されている。脱硝触媒層 3による脱硝反応により NOxを除去処理された排ガスは、図示していない次段の排 ガス処理装置等に導かれる。
[0021] また、脱硝装置 1の出口側に設けられた NOx分析計によりアンモニア水の必要量 が計算され、計算された量のアンモニア水がアンモニア水配管 13と内管 6を通って 噴出孔 11から排ガス中に噴出される。噴出孔 11から噴出されるアンモニア水は、外 管 7の開口 10から噴出される噴霧空気によって霧状になって脱硝装置入口ダクト 2 内に噴霧される。噴出孔 11の近傍領域におけるアンモニア水は、直接排ガスに曝さ れることはない。 [0020] The ammonia water sprayed into the exhaust gas flows into the denitration catalyst layer 3 while being evaporated by the heat of the exhaust gas, and a denitration reaction is performed on the denitration catalyst using ammonia as a reducing agent. Here, the spraying force of the ammonia water in the ammonia injection device 4 and the distance to the denitration catalyst layer 3 are set to a distance at which the sprayed ammonia water is sufficiently evaporated. The exhaust gas from which NOx has been removed by the denitration reaction by the denitration catalyst layer 3 is guided to a next-stage exhaust gas treatment device (not shown). [0021] Further, the required amount of ammonia water is calculated by a NOx analyzer provided at the outlet side of the denitration device 1, and the calculated amount of ammonia water passes through the ammonia water pipe 13 and the inner pipe 6 and is ejected through the hole 11 Is ejected into the exhaust gas. Ammonia water ejected from the ejection hole 11 is atomized by the atomizing air ejected from the opening 10 of the outer pipe 7 and sprayed into the denitration apparatus inlet duct 2. The ammonia water in the region near the ejection hole 11 is not directly exposed to the exhaust gas.
[0022] 一方、脱硝装置入口ダクト 2内における排ガス Gの流れは、整流管 12によって噴出 孔 11のアンモニア水の噴射方向と平行な流れを保つように整流される。そして、アン モ-ァ水は整流管 12を通過した排ガスと平行する方向に噴出孔 11から下流に向け て噴射される。その結果、アンモニア水が噴霧箇所の下流に均等に分散するので、 アンモニア水がそのまま蒸発しても排ガス中のアンモニア濃度に偏りを生ずることが ない。その結果、脱硝装置の性能低下等の問題を抑制できる。 On the other hand, the flow of the exhaust gas G in the denitration apparatus inlet duct 2 is rectified by the rectifying pipe 12 so as to maintain a flow parallel to the injection direction of the ammonia water in the ejection hole 11. The ammonia water is then ejected downstream from the ejection hole 11 in a direction parallel to the exhaust gas that has passed through the rectifying pipe 12. As a result, the ammonia water is evenly distributed downstream of the sprayed portion, so that even if the ammonia water evaporates as it is, there is no bias in the ammonia concentration in the exhaust gas. As a result, problems such as performance degradation of the denitration device can be suppressed.
[0023] また、整流管 12により二流体噴霧ノズル管 5の噴出孔 11近傍における排ガス流れ の逆流が抑制されるために、排ガス乱流による酸性硫安生成を防止して、噴霧ノズル の閉塞を抑制できる。 [0023] In addition, since the backflow of the exhaust gas flow in the vicinity of the ejection hole 11 of the two-fluid spray nozzle tube 5 is suppressed by the rectifier tube 12, the production of acidic ammonium sulfate due to the exhaust gas turbulence is prevented and the blockage of the spray nozzle is suppressed. it can.
[0024] 更に、外装管 8を設けて噴霧ノズル周辺に高温排ガスを供給することで、二流体噴 霧ノズル管 5周りの排ガス温度を高くすることができ、アンモニア水の蒸発時間を短縮 できる。その結果、図 1に示す二流体噴霧ノズル管 5から脱硝触媒層 3までの距離 La 、つまりアンモニア水の蒸発拡散距離を短縮でき、ダクト長さ或いは装置全体のコン パクトイ匕が可能である。 [0024] Furthermore, by providing the outer tube 8 and supplying high-temperature exhaust gas around the spray nozzle, the exhaust gas temperature around the two-fluid spray nozzle tube 5 can be increased, and the evaporation time of the ammonia water can be shortened. As a result, the distance La from the two-fluid spray nozzle tube 5 to the denitration catalyst layer 3 shown in FIG. 1, that is, the evaporation diffusion distance of ammonia water can be shortened, and the duct length or the entire apparatus can be reduced.
[0025] 本実施の形態によれば、ボイラ出口からの排ガス Gは、二流体噴霧ノズル管 5を覆 う外装管 8に設置された整流管 12により整流され、この整流された排ガス Gに対し二 流体噴霧ノズル管 5からアンモニア水が噴霧される。排ガス G中に噴霧されたアンモ ユア水は整流された排ガス中にて蒸発した後、下流の脱硝触媒層 3に流入するから 、逆流による外装管 8への酸性硫安付着を防止できる。 [0025] According to the present embodiment, the exhaust gas G from the boiler outlet is rectified by the rectifying pipe 12 installed in the outer pipe 8 covering the two-fluid spray nozzle pipe 5, and the rectified exhaust gas G is rectified. (2) Ammonia water is sprayed from the fluid spray nozzle tube 5. The ammonia water sprayed in the exhaust gas G evaporates in the rectified exhaust gas and then flows into the downstream denitration catalyst layer 3, so that it is possible to prevent acid ammonium sulfate from adhering to the outer tube 8 due to the backflow.
[0026] また、二流体噴霧ノズル管 5の周辺に高温排ガスを供給することができることから、 短時間でのアンモニア水蒸発が可能となり、二流体噴霧ノズル管 5の位置から脱硝 触媒層 3までの距離を短くできるので、アンモニア水直接噴霧システム設置における
スペース制約の問題を解消できる。 [0026] Further, since the high-temperature exhaust gas can be supplied to the periphery of the two-fluid spray nozzle tube 5, it is possible to evaporate ammonia water in a short time, and from the position of the two-fluid spray nozzle tube 5 to the denitration catalyst layer 3. Because the distance can be shortened, Can solve the space constraint problem.
(第 2の実施の形態） 本発明の第 2の実施の形態を、図 2 (A)、（B)を用いて説明す る。本実施の形態が前記第 1の実施の形態と異なるのは、円筒状の整流管 12の上 流端に、整流管 12の円筒開口を塞いで、円板状の多孔板 16を設置したことにある。 他の構成は第 1の実施の形態と同じであるので、同一の符号を付して説明を省略す る。 Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. 2 (A) and 2 (B). The present embodiment is different from the first embodiment in that a circular perforated plate 16 is installed at the upstream end of the cylindrical rectifying tube 12 by closing the cylindrical opening of the rectifying tube 12. It is in. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
[0027] 本実施の形態の多孔板 16は、整流管 12の円筒断面を塞ぐ円板状に形成され、そ の円板面に同じ大きさの 6個の孔 17が円周方向に均等に分散配置されて 、る。これ ら 6個の孔 17は、整流管 12の断面中心力もの半径方向距離が同じ位置に、かつ、 二流体噴霧ノズル管 5の軸線に対し、対称に配置されている。また、整流管 12の内 径を 2R、多孔板 16の孔 17の径を dとしたとき、 d/Rは、約 0. 45としてある。 [0027] The perforated plate 16 of the present embodiment is formed in a disc shape that closes the cylindrical cross section of the rectifying tube 12, and six holes 17 of the same size are evenly provided in the circumferential direction on the disc surface. Distributed. The six holes 17 are arranged at the same radial distance as the cross-sectional central force of the rectifying pipe 12 and symmetrically with respect to the axis of the two-fluid spray nozzle pipe 5. Further, when the inner diameter of the rectifying tube 12 is 2R and the diameter of the hole 17 of the perforated plate 16 is d, d / R is about 0.45.
[0028] 脱硝装置入口ダクト 2に流入する排ガス中の偏流影響が大き 、場合、整流管 12の 上流端に多孔板 16を設けることにより、排ガスの偏流影響を低減し、アンモニア水蒸 発後の ガス中のアンモニアの偏在が抑制される。 [0028] In the case where the drift effect in the exhaust gas flowing into the denitration device inlet duct 2 is large, by providing a perforated plate 16 at the upstream end of the rectifying pipe 12, the drift effect of the exhaust gas is reduced, and after the ammonia water is evaporated. The uneven distribution of ammonia in the gas is suppressed.
[0029] 孔 17の径、数、配置は、本実施の形態に限らず、排ガス中の偏流の程度に応じて 適宜選定することが望ま U、。
[0029] The diameter, number, and arrangement of the holes 17 are not limited to the present embodiment, and it is desirable to select them appropriately according to the degree of drift in the exhaust gas.
Claims
[1] ボイラ排ガス中に気体を用いてアンモニア水を噴霧する噴出孔を有する二流体噴霧 ノズル管と、アンモニアを含む排ガスを通過させて脱硝反応を行わせる脱硝触媒層と を有してなり、前記二流体噴霧ノズル管は、前記噴出孔に対向する箇所に噴霧を通 過させる開口を備えた外装管に内装され、前記外装管には、パージ空気が供給され るとともにその周囲を流れる排ガスを整流する整流管が装着されている排煙脱硝装 置。 [1] A two-fluid spray nozzle tube having a jet hole for spraying ammonia water using gas in the boiler exhaust gas, and a denitration catalyst layer for performing a denitration reaction by passing the exhaust gas containing ammonia, The two-fluid spray nozzle tube is mounted in an outer tube having an opening through which spray is passed at a position facing the ejection hole, and purge gas is supplied to the outer tube and exhaust gas flowing therearound is supplied to the outer tube. A flue gas denitration system equipped with a rectifying pipe that rectifies.
[2] 請求項 1に記載の排煙脱硝装置において、前記整流管は、円筒状に形成され、その 軸線を排ガスの流れ方向に一致させ、前記噴出孔と同心に前記外装管に装着され ているとともに、その内径は前記外装管の外径よりも大きぐその軸線方向の長さは 前記外装管の外径よりも大きいことを特徴とする排煙脱硝装置。 [2] In the flue gas denitration device according to claim 1, the rectifying pipe is formed in a cylindrical shape, and its axial line is aligned with the flow direction of the exhaust gas, and is attached to the outer pipe concentrically with the ejection hole. The flue gas denitration apparatus is characterized in that its inner diameter is larger than the outer diameter of the outer tube and its axial length is larger than the outer diameter of the outer tube.
[3] 請求項 2に記載の排煙脱硝装置において、前記円筒状の整流管の上流端に、複数 の開口を設けた多孔板が、整流管の上流側開口を塞ぐように装着されていることを特 徴とする排煙脱硝装置。
[3] In the flue gas denitration device according to claim 2, a perforated plate having a plurality of openings is mounted at the upstream end of the cylindrical rectifying pipe so as to close the upstream opening of the rectifying pipe. This is a flue gas denitration device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-094542 | 2006-03-30 | ||
| JP2006094542A JP5170974B2 (en) | 2006-03-30 | 2006-03-30 | Flue gas denitration equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007116602A1 true WO2007116602A1 (en) | 2007-10-18 |
Family
ID=38580905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/051994 WO2007116602A1 (en) | 2006-03-30 | 2007-02-06 | Flue gas denitration apparatus |
Country Status (2)
| Country | Link |
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| JP (1) | JP5170974B2 (en) |
| WO (1) | WO2007116602A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014230A (en) * | 2014-06-20 | 2014-09-03 | 北京中冶隆生环保科技发展有限公司 | Wet flue gas denitration process |
| CN108714367A (en) * | 2018-06-12 | 2018-10-30 | 王鹏 | A kind of online self-catalysis denitrification apparatus of sintering flue dust |
| WO2020153304A1 (en) * | 2019-01-21 | 2020-07-30 | 三菱日立パワーシステムズ株式会社 | Denitration device |
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| KR100986358B1 (en) * | 2008-04-03 | 2010-10-08 | 현대자동차주식회사 | Exhaust Pipe With NOx Selective Catalytic Reduction |
| JP5284722B2 (en) * | 2008-08-20 | 2013-09-11 | バブコック日立株式会社 | Flue gas denitration equipment |
| JPWO2010146670A1 (en) * | 2009-06-17 | 2012-11-29 | 三菱重工業株式会社 | Mercury removal system and mercury removal method for mercury-containing high-temperature exhaust gas |
| EP2444144B1 (en) * | 2009-06-17 | 2018-10-03 | Mitsubishi Hitachi Power Systems, Ltd. | System for removing mercury and method of removing mercury from mercury-containing high-temperature discharge gas |
| JP5693061B2 (en) * | 2010-06-30 | 2015-04-01 | 三菱重工業株式会社 | Exhaust gas treatment equipment |
| JP6785046B2 (en) * | 2016-02-26 | 2020-11-18 | 三菱パワー株式会社 | How to remove exhaust ducts, boilers and solid particles |
| JP2017124398A (en) * | 2017-02-20 | 2017-07-20 | 三菱日立パワーシステムズ株式会社 | Nozzle cleaning device |
| CN109821415B (en) * | 2019-02-20 | 2023-12-08 | 山东莱钢永锋钢铁有限公司 | SCR flue gas denitration double-fluid heating spray gun system of coal-fired boiler |
| CN113559705B (en) * | 2021-08-05 | 2023-04-07 | 西安热工研究院有限公司 | Drainage type SCR denitration urea direct injection system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2007268355A (en) | 2007-10-18 |
| JP5170974B2 (en) | 2013-03-27 |
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