JP2007000784A - Denitrification apparatus with protective tube provided on urea water jetting nozzle - Google Patents

Denitrification apparatus with protective tube provided on urea water jetting nozzle Download PDF

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JP2007000784A
JP2007000784A JP2005184202A JP2005184202A JP2007000784A JP 2007000784 A JP2007000784 A JP 2007000784A JP 2005184202 A JP2005184202 A JP 2005184202A JP 2005184202 A JP2005184202 A JP 2005184202A JP 2007000784 A JP2007000784 A JP 2007000784A
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urea water
exhaust gas
injection nozzle
water injection
protective tube
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Katsuhisa Nakada
勝久 中田
Noritoshi Ando
則俊 安藤
Masahide Tsujishita
正秀 辻下
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SAMSON CO Ltd
Osaka Gas Co Ltd
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SAMSON CO Ltd
Osaka Gas Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To provide a denitrification apparatus reducing and removing nitrogen oxides in combustion exhaust gas by jetting urea water from the urea water jetting nozzle, wherein deposition of urea in a urea water jetting nozzle due to heating of the nozzle is prevented, and collision of urea water against an exhaust gas passage wall face is prevented. <P>SOLUTION: The denitrification apparatus is constituted so that the urea water jetting nozzle 4 is set in an exhaust gas passage 3 through which the combustion exhaust gas generated in a combustion apparatus such as a power engine passes, and urea water is jetted from the nozzle 4 toward the combustion exhaust gas to reduce and remove nitrogen oxides in the combustion exhaust gas, wherein a cylindrical protective tube 9 with a tip end face opened and covering the periphery of the nozzle 4 is provided near the tip end of the urea water jetting nozzle 4, and the nozzle 4 with the protective tube is projectingly installed in the exhaust gas passage 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、燃焼排ガス中に尿素水を噴射して窒素酸化物を除去する脱硝装置であって、尿素水噴射ノズルに保護管を設けた脱硝装置に関するものである。   The present invention relates to a denitration device that removes nitrogen oxides by injecting urea water into combustion exhaust gas, and relates to a denitration device in which a protective pipe is provided on a urea water injection nozzle.

特許第３４９９５７６号公報に記載があるように、ガスタービンやエンジンなどの原動機と、原動機で発生した燃焼排ガスから熱を回収する排熱ボイラを設置しておき、動力とともに熱を利用することで装置全体としての効率を高めるということが行われている。そして、燃焼排ガスに含まれている窒素酸化物を除去するために、燃焼排ガス中へ尿素水を噴射し、窒素酸化物を還元除去することが行われている。   As described in Japanese Patent No. 3499576, a motor such as a gas turbine or an engine and an exhaust heat boiler that recovers heat from combustion exhaust gas generated by the motor are installed, and the apparatus is used by utilizing heat together with power. Increasing overall efficiency is being done. In order to remove nitrogen oxides contained in the combustion exhaust gas, urea water is injected into the combustion exhaust gas to reduce and remove the nitrogen oxides.

燃焼排ガスへ向けて尿素水を噴射する尿素水噴射ノズルは、原動機と排熱ボイラの間をつなぐ排ガス通路に設置する。特許第３４９９５７６号では、ダクトの周側面にノズル取付座を設置しておき、ノズルは先端部がダクトの内周面よりもダクト内に突出しないように、取付座のフランジに取り付けるようにしている。   The urea water injection nozzle that injects urea water toward the combustion exhaust gas is installed in an exhaust gas passage that connects between the prime mover and the exhaust heat boiler. In Japanese Patent No. 3499576, a nozzle mounting seat is installed on the peripheral side surface of the duct, and the nozzle is mounted on the flange of the mounting seat so that the tip portion does not protrude into the duct from the inner peripheral surface of the duct. .

尿素水噴射ノズルを排ガス通路内に突出して設置すると、尿素水噴射ノズルは燃焼排ガスの熱を直接受けることになり、排ガス通路内の燃焼排ガスは高温であるため、尿素水噴射ノズルは燃焼排ガスによって加熱される。尿素水噴射ノズルでは尿素水を噴射している時には、供給し続けている尿素水によって尿素水噴射ノズルを冷却することができるため、尿素水噴射ノズルが高温になることはない。しかし、尿素水の供給を停止している場合には尿素水によって尿素水噴射ノズルを冷却することができないため、ノズル部が高温になり、尿素水噴射ノズル内に残留している尿素水が加熱されると、尿素水から水分が蒸発して尿素が析出することがある。   If the urea water injection nozzle is installed so as to protrude into the exhaust gas passage, the urea water injection nozzle directly receives the heat of the combustion exhaust gas, and the combustion exhaust gas in the exhaust gas passage is hot. Heated. When the urea water injection nozzle is injecting urea water, the urea water injection nozzle can be cooled by the urea water continuously supplied, so the urea water injection nozzle does not reach a high temperature. However, when the supply of urea water is stopped, the urea water injection nozzle cannot be cooled by the urea water, so the nozzle portion becomes hot and the urea water remaining in the urea water injection nozzle is heated. Then, moisture may evaporate from the urea water and urea may precipitate.

出願人は、排ガス通路内の排ガス量や排ガス温度、尿素水の供給量などを通常の脱硝運転を想定した条件とし、尿素水噴射ノズルの先端が燃焼排ガス流内に＋２０mm突出させた場合と、０mmつまり燃焼排ガス流境界の延長線上に尿素水噴射ノズルを配置して燃焼排ガス流内には突出させなかった場合における尿素水噴射ノズルの管壁温度を測定した。尿素が析出する可能性は、エンジン停止に先立って尿素水の供給を停止する脱硝運転の終了工程時に高まるため、終了工程時の温度を測定した。終了工程時に尿素が析出するのは、終了工程時の場合、パージエアを供給することで尿素水噴射ノズル冷却の作用は得られるが、パージエアによる冷却効果は尿素水供給による冷却効果より劣るため、尿素水噴射ノズルの温度は高くなり、尿素水噴射ノズル内に残っていた尿素水の温度が上昇するためである。   The applicant assumes that the exhaust gas amount in the exhaust gas passage, the exhaust gas temperature, the supply amount of urea water, etc. are the conditions assuming normal denitration operation, and the tip of the urea water injection nozzle protrudes +20 mm into the combustion exhaust gas flow. The tube wall temperature of the urea water injection nozzle was measured when the urea water injection nozzle was arranged at 0 mm, that is, on the extended line of the combustion exhaust gas flow boundary and was not projected into the combustion exhaust gas flow. Since the possibility that urea precipitates increases at the end of the denitration operation in which the supply of urea water is stopped prior to stopping the engine, the temperature at the end of the process was measured. Urea precipitates in the end process. In the end process, urea air injection nozzle cooling action can be obtained by supplying purge air, but the cooling effect of purge air is inferior to the cooling effect of urea water supply. This is because the temperature of the water injection nozzle rises and the temperature of the urea water remaining in the urea water injection nozzle rises.

終了工程時における尿素水噴射ノズルの温度を測定したところ、燃焼排ガス流内に尿素水噴射ノズルを突出させた方が、突出させていない場合に比べて約４０℃高くなるという結果が得られた。そして、排ガス通路内に突出させていない場合における尿素水噴射ノズル管壁温度は、尿素水から尿素が析出する温度以下であったのに対し、排ガス通路内に突出させた場合における尿素水噴射ノズル温度は、尿素水から尿素が析出する温度よりも高くなっているという測定結果が得られた。尿素水噴射ノズルが尿素析出温度より高くなるということは、尿素水噴射ノズル内に尿素水が残留した場合に尿素が析出するということであり、この場合には尿素水が固化して尿素水噴射ノズルが詰まるため、尿素水噴射ノズルを排ガス通路に突出させてはならないということが分かる。   When the temperature of the urea water injection nozzle at the end of the process was measured, the result that the urea water injection nozzle protruded into the combustion exhaust gas flow was higher by about 40 ° C. than the case where the urea water injection nozzle did not protrude. . The urea water injection nozzle tube wall temperature when not protruding into the exhaust gas passage was below the temperature at which urea precipitates from the urea water, whereas the urea water injection nozzle when protruding into the exhaust gas passage The measurement result was obtained that the temperature was higher than the temperature at which urea was precipitated from the urea water. The fact that the urea water injection nozzle becomes higher than the urea precipitation temperature means that urea is precipitated when urea water remains in the urea water injection nozzle. In this case, the urea water is solidified and the urea water injection is performed. It can be seen that because the nozzle is clogged, the urea water injection nozzle should not protrude into the exhaust gas passage.

また、出願人は前記とは逆に尿素水噴射ノズルを−２０mm、つまり排ガス通路の周側面よりも外側に引っ込めた場合での試験も行った。−２０mmにおける尿素水噴射ノズル管壁温度は０mm時と同等であったが、−２０mmの場合、噴射した尿素水が排ガス通路に衝突していることが確認できた。尿素水噴射ノズルから噴射した尿素水が排ガス通路壁面に衝突すると、排ガス通路壁面に割れが発生する要因となる。排ガス通路に割れが発生した場合には排ガス通路を交換する必要があり、修復には時間が掛かることになる。   On the contrary, the applicant conducted a test in the case where the urea water injection nozzle was retracted to -20 mm, that is, outside the peripheral side surface of the exhaust gas passage. The urea water injection nozzle wall temperature at −20 mm was the same as that at 0 mm, but in the case of −20 mm, it was confirmed that the injected urea water collided with the exhaust gas passage. When the urea water injected from the urea water injection nozzle collides with the exhaust gas passage wall surface, it causes a crack in the exhaust gas passage wall surface. When a crack occurs in the exhaust gas passage, it is necessary to replace the exhaust gas passage, and it takes time to repair.

これらのことより、尿素水噴射ノズルは、排ガス通路の周側面より排ガス通路側に突出することも、周側面より外側に後退することもできないということが分かった。しかし、尿素水噴射ノズルを排ガス通路に取り付ける場合、尿素水噴射ノズルは排ガス通路内となり、接続は排ガス通路の外側から行わなければならないため、尿素水噴射ノズルと排ガス通路周側面の位置を確認しながら設置位置を調節するということは構造的に難しく、位置にずれが発生しやすいという問題があった。
特許３４９９５７６号公報 From these facts, it has been found that the urea water injection nozzle cannot protrude from the peripheral side surface of the exhaust gas passage to the exhaust gas passage side, nor can it retreat outward from the peripheral side surface. However, when the urea water injection nozzle is attached to the exhaust gas passage, the urea water injection nozzle is in the exhaust gas passage and must be connected from the outside of the exhaust gas passage. However, it is structurally difficult to adjust the installation position, and there is a problem that the position is likely to shift.
Japanese Patent No. 3499576

本発明が解決しようとする課題は、尿素水噴射ノズルから尿素水を噴射することで燃焼排ガス中の窒素酸化物を還元除去する脱硝装置において、尿素水噴射ノズルが加熱されて尿素水噴射ノズル内で尿素が析出したり、尿素水が排ガス通路壁面に衝突することを防止することにある。   The problem to be solved by the present invention is that in a denitration apparatus that reduces and removes nitrogen oxides in combustion exhaust gas by injecting urea water from a urea water injection nozzle, the urea water injection nozzle is heated and the inside of the urea water injection nozzle This is to prevent urea from being precipitated and urea water from colliding with the wall surface of the exhaust gas passage.

請求項１に記載の発明は、原動機など燃焼装置で発生した燃焼排ガスを通す排ガス通路に尿素水噴射ノズルを設置しておき、尿素水噴射ノズルから燃焼排ガスへ向けて尿素水を噴射し、燃焼排ガス中の窒素酸化物を還元除去するようにしている脱硝装置であって、尿素水噴射ノズルの先端付近には、先端側の面を開口し尿素水噴射ノズルの周囲を覆う円筒形の保護管を設けておき、保護管付きの尿素水噴射ノズルを排ガス通路内に突出するように設置していることを特徴とする。   According to the first aspect of the present invention, a urea water injection nozzle is installed in an exhaust gas passage through which combustion exhaust gas generated by a combustion apparatus such as a prime mover passes, and urea water is injected from the urea water injection nozzle toward the combustion exhaust gas to perform combustion. A denitration device that reduces and removes nitrogen oxides in exhaust gas, and a cylindrical protective tube that opens around the tip of the urea water injection nozzle and covers the periphery of the urea water injection nozzle The urea water injection nozzle with a protective tube is installed so as to protrude into the exhaust gas passage.

請求項２に記載の発明は、前記の尿素水噴射ノズルに保護管を設けた脱硝装置において、前記保護管は、排ガス通路内を流れる燃焼ガス流の下流側となる面よりも上流側となる面の方が、排ガス通路内により大きく突出するように設置していることを特徴とする。   According to a second aspect of the present invention, in the denitration apparatus in which the urea water injection nozzle is provided with a protective tube, the protective tube is on the upstream side of the downstream surface of the combustion gas flow flowing in the exhaust gas passage. The surface is installed so as to protrude more greatly in the exhaust gas passage.

請求項３に記載の発明は、尿素水噴射ノズルに保護管を設けた脱硝装置において、尿素水噴射ノズルの先端位置は、保護管の燃焼ガス流の下流側となる面における先端位置から保護管の燃焼ガス流の上流側となる面における先端位置までの間となるように、尿素水噴射ノズルと保護管を配置するようにしていることを特徴とする。   According to a third aspect of the present invention, in the denitration apparatus in which the urea water injection nozzle is provided with a protective tube, the tip position of the urea water injection nozzle is from the tip position on the surface downstream of the combustion gas flow of the protective tube. The urea water injection nozzle and the protective tube are arranged so as to reach the tip position on the upstream surface of the combustion gas flow.

本発明を実施することで、保護管によって燃焼排ガスが尿素水噴射ノズルを直接加熱することを防止できるため、尿素水噴射ノズルが燃焼排ガス流内に突出していても、尿素水噴射ノズルの大幅な温度上昇を防止でき、尿素水噴射ノズルでの詰まり発生を防止できる。そして、尿素水噴射ノズルは排ガス通路内へ突出しており、さらに尿素水噴射ノズルと排ガス通路の間には保護管があるため、尿素水噴射ノズルから噴射した尿素水が排ガス通路に付着することを防止する効果を得ることもできる。また、保護管と尿素水噴射ノズルの取付けは、尿素水噴射ノズルを排ガス通路に取り付ける前に行うため、保護管と尿素水噴射ノズルの取付け時に、保護管と尿素水噴射ノズルの位置がずれないように、位置を確認しながら適正な位置に配置することができる。そして、もしも尿素水が保護管に付着し、保護管に割れが発生することになったとしても、保護管のみを交換すればよいため修復は容易に行える。   By implementing the present invention, it is possible to prevent the combustion exhaust gas from directly heating the urea water injection nozzle by the protective tube, so that even if the urea water injection nozzle protrudes into the combustion exhaust gas flow, Temperature rise can be prevented, and clogging at the urea water injection nozzle can be prevented. The urea water injection nozzle protrudes into the exhaust gas passage, and there is a protective tube between the urea water injection nozzle and the exhaust gas passage, so that the urea water injected from the urea water injection nozzle adheres to the exhaust gas passage. It is also possible to obtain the effect of preventing. In addition, since the protection tube and the urea water injection nozzle are attached before the urea water injection nozzle is attached to the exhaust gas passage, the positions of the protection tube and the urea water injection nozzle do not shift when the protection tube and the urea water injection nozzle are attached. Thus, it can arrange | position in an appropriate position, confirming a position. And even if urea water adheres to a protective tube and a crack occurs in the protective tube, it is easy to repair because only the protective tube needs to be replaced.

また、保護管は燃焼排ガス流の下流側となる面よりも上流側となる面の方が、排ガス通路内により大きく突出するようにしている場合、保護管の燃焼排ガス流上流側となる面における燃焼排ガス流を遮る作用が高まるため、燃焼排ガスによる尿素水噴射ノズルの加熱防止効果を高めることができる。そして保護管の燃焼排ガス流下流側となる面では、尿素水噴射ノズルよりも突出長さを短くしているため、尿素水噴射ノズルから噴射した尿素水が保護管に付着する可能性は低くなっており、保護管に尿素水が衝突して保護管が割れるということを防止できる。   In addition, when the protective tube has a surface on the upstream side that protrudes more in the exhaust gas passage than a surface on the downstream side of the combustion exhaust gas flow, Since the effect | action which interrupts combustion exhaust gas flow increases, the heating prevention effect of the urea water injection nozzle by combustion exhaust gas can be heightened. And since the protrusion length is made shorter than the urea water injection nozzle on the surface on the downstream side of the combustion exhaust gas flow of the protective tube, the possibility that the urea water injected from the urea water injection nozzle adheres to the protective tube is low. Therefore, it is possible to prevent the urea water from colliding with the protective tube and breaking the protective tube.

本発明の一実施例を図面を用いて説明する。図１は本発明を実施する脱硝装置全体のフロー例を示したフロー図、図２は本発明の一実施例での尿素水噴射ノズル部分説明図である。   An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an example of the flow of the entire denitration apparatus for carrying out the present invention, and FIG.

燃焼排ガスの発生源であるガスタービン等の原動機（図示せず）からは高温の燃焼排ガスが発生するため、原動機で発生した燃焼排ガスから熱を回収する排熱ボイラ（図示せず）を設置する。原動機と排熱ボイラは、排ガス通路３で接続し、排ガス通路３を通して燃焼排ガスを流すようにしておき、排ガス通路３に尿素水噴射ノズル４を設置する。燃焼排ガスは有害な窒素酸化物含んでいるため、尿素水を燃焼排ガス中に噴射し、アンモニアの還元作用を利用して窒素酸化物を窒素と水に分解することで無害化する。   Since a high-temperature combustion exhaust gas is generated from a prime mover (not shown) such as a gas turbine that is a source of combustion exhaust gas, an exhaust heat boiler (not shown) that recovers heat from the combustion exhaust gas generated by the prime mover is installed. . The prime mover and the exhaust heat boiler are connected by the exhaust gas passage 3 so that the combustion exhaust gas flows through the exhaust gas passage 3, and the urea water injection nozzle 4 is installed in the exhaust gas passage 3. Since combustion exhaust gas contains harmful nitrogen oxides, urea water is injected into the combustion exhaust gas and detoxified by decomposing nitrogen oxides into nitrogen and water using the reducing action of ammonia.

尿素水噴射ノズル４内で尿素水から尿素が析出すると、尿素水噴射ノズル４が詰まることになるため、尿素水噴射ノズル４内が詰まらないようにする必要がある。そこで、尿素水噴射ノズル４へは尿素水だけでなく、水や空気を供給することもできるようにしておき、尿素水噴射ノズル４内を洗浄できるようにしておく。尿素水噴射ノズル４には、尿素水供給経路１と空気供給経路２を接続しており、尿素水供給経路１からは尿素水又は水、空気供給経路２からは空気を供給するようにしている。尿素水供給経路１の上流側には、尿素水供給ポンプ５と水供給ポンプ６を並列に設置しており、途中で流路を合流させている。空気供給経路２の上流側には空気供給ポンプ７を設置し、空気供給ポンプ７と尿素水噴射ノズル４の間にパージ用空気制御弁１１を設けている。   If urea is precipitated from the urea water in the urea water injection nozzle 4, the urea water injection nozzle 4 is clogged, so that it is necessary to prevent the urea water injection nozzle 4 from clogging. Therefore, not only urea water but also water and air can be supplied to the urea water injection nozzle 4 so that the inside of the urea water injection nozzle 4 can be cleaned. A urea water supply path 1 and an air supply path 2 are connected to the urea water injection nozzle 4, and urea water or water is supplied from the urea water supply path 1, and air is supplied from the air supply path 2. . On the upstream side of the urea water supply path 1, a urea water supply pump 5 and a water supply pump 6 are installed in parallel, and the flow paths are joined on the way. An air supply pump 7 is installed upstream of the air supply path 2, and a purge air control valve 11 is provided between the air supply pump 7 and the urea water injection nozzle 4.

また、図示していないが尿素水噴射ノズル４の外側にはアトマイズエアラインを設置しておき、尿素水噴射時にアトマイズエアを噴射することで尿素水の拡散効果を高めることは有効である。その場合、空気供給経路２は途中で分岐して尿素水噴射ノズル４とアトマイズエアラインに接続する。尿素水噴射ノズル４の外側にアトマイズエアラインを設けておけば、アトマイズエアによって尿素水噴射ノズルを冷却する作用を得ることもできる。尿素水供給ポンプ５、水供給ポンプ６、空気供給ポンプ７、パージ用空気制御弁１１は、脱硝装置の運転を制御する制御装置８と接続しておき、制御装置８が各機器の作動を制御する。   Although not shown, it is effective to install an atomizing air line outside the urea water injection nozzle 4 and to increase the diffusion effect of urea water by injecting atomized air at the time of urea water injection. In that case, the air supply path 2 branches in the middle and is connected to the urea water injection nozzle 4 and the atomizing air line. If an atomizing air line is provided outside the urea water injection nozzle 4, an action of cooling the urea water injection nozzle by the atomizing air can be obtained. The urea water supply pump 5, the water supply pump 6, the air supply pump 7, and the purge air control valve 11 are connected to a control device 8 that controls the operation of the denitration device, and the control device 8 controls the operation of each device. To do.

排ガス通路３には、壁面に尿素水噴射ノズル用の取付座１２を設ける。取付座１２は排ガス通路外面から直角に立ち上げている円筒部と円筒部先端に設けたフランジ１０からなっている。尿素水噴射ノズル４は先端に噴射口を持ち、側面に排ガス通路３に取り付けるためのフランジ１０を設けている。尿素水噴射ノズル４は排ガス通路３のフランジ１０に直接接続するのではなく、尿素水噴射ノズル４と保護管９を接続し、保護管９と排ガス通路３を接続するようにしている。保護管９は尿素水噴射ノズル４の先端付近を覆う円筒形の部材であり、先端側は尿素水を噴射するために開口している。保護管９の先端は、排ガス通路内を流れる燃焼ガス流の下流側となる面よりも上流側となる面の方が、排ガス通路内により大きく突出するように、斜めに切断した形状としている。保護管９には、根元側に尿素水噴射ノズル４と接続するためのフランジ１０、中間の側面に排ガス通路３と接続するためのフランジ１０を設けておく。   The exhaust gas passage 3 is provided with a mounting seat 12 for the urea water injection nozzle on the wall surface. The mounting seat 12 is composed of a cylindrical portion rising at a right angle from the outer surface of the exhaust gas passage and a flange 10 provided at the tip of the cylindrical portion. The urea water injection nozzle 4 has an injection port at the tip, and is provided with a flange 10 for attaching to the exhaust gas passage 3 on the side surface. The urea water injection nozzle 4 is not directly connected to the flange 10 of the exhaust gas passage 3, but is connected to the urea water injection nozzle 4 and the protective tube 9, and connects the protective tube 9 and the exhaust gas passage 3. The protective tube 9 is a cylindrical member that covers the vicinity of the tip of the urea water injection nozzle 4, and the tip side is open to inject urea water. The tip of the protective tube 9 has a shape cut obliquely so that the surface on the upstream side of the combustion gas flow flowing in the exhaust gas passage protrudes more greatly in the exhaust gas passage. The protective tube 9 is provided with a flange 10 for connecting to the urea water injection nozzle 4 on the base side, and a flange 10 for connecting to the exhaust gas passage 3 on the intermediate side surface.

尿素水噴射ノズル４の取付けは、まず尿素水噴射ノズル４と保護管９を接続する。尿素水噴射ノズル４の先端位置は、保護管９の長い面の側における先端と短い面の側における先端の間になるように調節しておく。次に、尿素水噴射ノズル４と接続している保護管９を排ガス通路３と接続する。保護管９を排ガス通路３に接続する場合、保護管９の長い面が燃焼排ガス流の上流側になるように向きをあわせておき、保護管９の短い面の先端も排ガス通路３の壁面の延長線上より排ガス通路３の中央側へ突出させるようにしておく。   The urea water injection nozzle 4 is attached by first connecting the urea water injection nozzle 4 and the protective tube 9. The tip position of the urea water injection nozzle 4 is adjusted so as to be between the tip on the long surface side of the protective tube 9 and the tip on the short surface side. Next, the protective tube 9 connected to the urea water injection nozzle 4 is connected to the exhaust gas passage 3. When connecting the protective tube 9 to the exhaust gas passage 3, the orientation is such that the long surface of the protective tube 9 is upstream of the combustion exhaust gas flow, and the tip of the short surface of the protective tube 9 is also on the wall of the exhaust gas passage 3. It is made to project from the extension line toward the center of the exhaust gas passage 3.

脱硝運転は原動機の運転状況や触媒温度などに基づいて行う。脱硝運転中は、尿素水供給ポンプ５を稼働し、尿素水噴射ノズル４へ尿素水を供給しておき、尿素水噴射ノズル４の先端から尿素水を噴射することによって、排ガス通路３内を流れている燃焼排ガス中の窒素酸化物を還元除去する。尿素水噴射ノズル４の先端から噴射した尿素水は、燃焼排ガス流内へ拡散し、燃焼排ガス流によって押し流されるため、尿素水噴射ノズル４から燃焼排ガス流下流方向へと流れていく。尿素水噴射ノズル４の先端は、排ガス通路の壁面よりも燃焼排ガス流側へ突出しており、尿素水噴射ノズル４と排ガス通路壁面の間には保護管９もあるため、尿素水が排ガス通路の壁面と衝突することを防止できる。また、尿素水噴射ノズル４の先端は、保護管９の燃焼排ガス流の下流側となる面よりも燃焼排ガス流側へ突出しているため、尿素水が保護管９に衝突することも防止できる。   The denitration operation is performed based on the operating condition of the prime mover and the catalyst temperature. During the denitration operation, the urea water supply pump 5 is operated, the urea water is supplied to the urea water injection nozzle 4, and the urea water is injected from the tip of the urea water injection nozzle 4 to flow in the exhaust gas passage 3. The nitrogen oxides in the combustion exhaust gas are reduced and removed. The urea water injected from the tip of the urea water injection nozzle 4 diffuses into the combustion exhaust gas flow and is pushed away by the combustion exhaust gas flow, and therefore flows from the urea water injection nozzle 4 in the downstream direction of the combustion exhaust gas flow. The tip of the urea water injection nozzle 4 protrudes to the combustion exhaust gas flow side from the wall surface of the exhaust gas passage, and there is also a protective tube 9 between the urea water injection nozzle 4 and the exhaust gas passage wall surface. It can prevent colliding with the wall surface. Further, since the tip of the urea water injection nozzle 4 protrudes to the combustion exhaust gas flow side from the surface of the protection tube 9 on the downstream side of the combustion exhaust gas flow, the urea water can be prevented from colliding with the protection tube 9.

尿素水噴射中は、供給している尿素水によって尿素水噴射ノズル４が冷却されるため、尿素水噴射ノズル４内で尿素が析出することはないが、脱硝運転停止時には尿素水供給停止後も燃焼排ガスの熱によって尿素水噴射ノズル４が加熱されることがあるため、尿素水噴射ノズル４の加熱を防止する必要がある。尿素水噴射ノズル４は、保護管９によって覆われており、排ガス通路３内を流れてきた燃焼排ガスは、保護管９の側壁面に衝突し、保護管９の側壁面に沿って流れる。燃焼排ガス流は尿素水噴射ノズル４の手前にある保護管９によって遮られているため、燃焼排ガス流が尿素水噴射ノズル４に直接衝突することはなく、尿素水噴射ノズル４への加熱量が抑えられる。そのため、尿素水噴射ノズル４へバーナエアを供給しておくだけでも、尿素水噴射ノズル４が尿素析出温度まで上昇することを防止でき、尿素水噴射ノズル４内で詰まりが発生することを防止できる。   During the urea water injection, the urea water injection nozzle 4 is cooled by the supplied urea water, so that urea does not precipitate in the urea water injection nozzle 4, but even after the urea water supply is stopped when the denitration operation is stopped. Since the urea water injection nozzle 4 may be heated by the heat of the combustion exhaust gas, it is necessary to prevent the urea water injection nozzle 4 from being heated. The urea water injection nozzle 4 is covered with a protective tube 9, and the combustion exhaust gas flowing through the exhaust gas passage 3 collides with the side wall surface of the protective tube 9 and flows along the side wall surface of the protective tube 9. Since the combustion exhaust gas flow is blocked by the protective tube 9 in front of the urea water injection nozzle 4, the combustion exhaust gas flow does not directly collide with the urea water injection nozzle 4, and the amount of heating to the urea water injection nozzle 4 is reduced. It can be suppressed. Therefore, it is possible to prevent the urea water injection nozzle 4 from rising to the urea deposition temperature and to prevent clogging in the urea water injection nozzle 4 simply by supplying burner air to the urea water injection nozzle 4.

本発明を実施する脱硝装置全体のフロー例を示したフロー図Flow chart showing an example of the flow of the entire denitration apparatus for carrying out the present invention 本発明の一実施例での尿素水噴射ノズル部分説明図Urea water injection nozzle part explanatory drawing in one example of the present invention

符号の説明Explanation of symbols

１ 尿素水供給経路
２ 空気供給経路
３ 排ガス通路
４ 尿素水噴射ノズル
５ 尿素水供給ポンプ
６ 水供給ポンプ
７ 空気供給ポンプ
８ 制御装置
９ 保護管
１０ フランジ
１１ パージ用空気制御弁
１２ 取付座 1 Urea water supply route
2 Air supply path
3 Exhaust gas passage
4 Urea water injection nozzle
5 Urea water supply pump 6 Water supply pump
7 Air supply pump
8 Control device 9 Protective tube 10 Flange 11 Purge air control valve 12 Mounting seat

Claims (3)

原動機など燃焼装置で発生した燃焼排ガスを通す排ガス通路に尿素水噴射ノズルを設置しておき、尿素水噴射ノズルから燃焼排ガスへ向けて尿素水を噴射し、燃焼排ガス中の窒素酸化物を還元除去するようにしている脱硝装置であって、尿素水噴射ノズルの先端付近には、先端側の面を開口し尿素水噴射ノズルの周囲を覆う円筒形の保護管を設けておき、保護管付きの尿素水噴射ノズルを排ガス通路内に突出するように設置していることを特徴とする尿素水噴射ノズルに保護管を設けた脱硝装置。   A urea water injection nozzle is installed in the exhaust gas passage through which the combustion exhaust gas generated by a combustion device such as a prime mover passes, and urea water is injected from the urea water injection nozzle toward the combustion exhaust gas to reduce and remove nitrogen oxides in the combustion exhaust gas. A denitration apparatus is provided in the vicinity of the tip of the urea water injection nozzle. A cylindrical protective tube is provided in the vicinity of the tip of the urea water injection nozzle so as to cover the periphery of the urea water injection nozzle. A denitration apparatus comprising a urea water injection nozzle provided with a protective tube, wherein the urea water injection nozzle is installed so as to protrude into the exhaust gas passage. 請求項１に記載の尿素水噴射ノズルに保護管を設けた脱硝装置において、前記保護管は、排ガス通路内を流れる燃焼ガス流の下流側となる面よりも上流側となる面の方が、排ガス通路内により大きく突出するように設置していることを特徴とする尿素水噴射ノズルに保護管を設けた脱硝装置。   In the denitration apparatus in which the urea water injection nozzle according to claim 1 is provided with a protective tube, the protective tube has a surface on the upstream side rather than a surface on the downstream side of the combustion gas flow flowing in the exhaust gas passage. A denitration apparatus provided with a protective pipe in a urea water injection nozzle, wherein the urea water injection nozzle is installed so as to protrude more greatly in the exhaust gas passage. 請求項２に記載の尿素水噴射ノズルに保護管を設けた脱硝装置において、尿素水噴射ノズルの先端位置は、保護管の燃焼ガス流の下流側となる面における先端位置から保護管の燃焼ガス流の上流側となる面における先端位置までの間となるように、尿素水噴射ノズルと保護管を配置するようにしていることを特徴とする尿素水噴射ノズルに保護管を設けた脱硝装置。   3. The denitration apparatus having a urea water injection nozzle according to claim 2 provided with a protective tube, wherein the tip position of the urea water injection nozzle is from the tip position on the downstream side of the combustion gas flow of the protective tube to the combustion gas of the protective tube. A denitration apparatus having a urea water injection nozzle provided with a protective tube, wherein the urea water injection nozzle and the protective tube are arranged so as to reach a tip position on a surface on the upstream side of the flow.
JP2005184202A 2005-06-24 2005-06-24 Denitrification apparatus with protective tube provided on urea water jetting nozzle Pending JP2007000784A (en)

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US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer
CN113996166A (en) * 2021-10-22 2022-02-01 浙江宜可欧环保科技有限公司 Method and device for deacidifying hot flue gas

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US9664081B2 (en) 2007-07-24 2017-05-30 Faurecia Emissions Control Technologies, Germany Gmbh Assembly and method for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine
JP2009041502A (en) * 2007-08-10 2009-02-26 Hino Motors Ltd Urea addition nozzle
US8607550B2 (en) 2007-11-30 2013-12-17 Bayerische Motoren Werke Aktiengesellschaft System for admixing a reducing agent to an exhaust gas flow of an internal-combustion engine
DE102007057837A1 (en) * 2007-11-30 2009-06-04 Bayerische Motoren Werke Aktiengesellschaft Device for admixing a reducing agent in an exhaust gas stream of an internal combustion engine
JP2009156069A (en) * 2007-12-25 2009-07-16 Mitsubishi Motors Corp Exhaust emission control device for internal combustion engine
DE102008059602A1 (en) * 2008-11-28 2010-06-02 Bayerische Motoren Werke Aktiengesellschaft Device for mixing reducing agent in exhaust gas stream of internal combustion engine, has exhaust line and dosing unit with opening for supplying reducing agent in exhaust line
DE102009048514A1 (en) * 2009-10-07 2011-04-14 Emitec Gesellschaft Für Emissionstechnologie Mbh Injektorhalterung
JP2012021506A (en) * 2010-07-16 2012-02-02 Isuzu Motors Ltd Exhaust gas purification device
WO2012008571A1 (en) * 2010-07-16 2012-01-19 いすゞ自動車株式会社 Exhaust gas purification device
JP2013010089A (en) * 2011-06-30 2013-01-17 Sumitomo Osaka Cement Co Ltd Denitration apparatus, and supply nozzle
US9726064B2 (en) 2015-04-30 2017-08-08 Faurecia Emissions Control Technologies, Usa, Llc Mixer for use in a vehicle exhaust system
US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer
CN113996166A (en) * 2021-10-22 2022-02-01 浙江宜可欧环保科技有限公司 Method and device for deacidifying hot flue gas
CN113996166B (en) * 2021-10-22 2023-10-24 浙江宜可欧环保科技有限公司 Method and device for deacidifying hot flue gas

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