JP2007216130A - Denitrification process and denitrification equipment for nox-containing exhaust gas - Google Patents

Denitrification process and denitrification equipment for nox-containing exhaust gas Download PDF

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JP2007216130A
JP2007216130A JP2006038702A JP2006038702A JP2007216130A JP 2007216130 A JP2007216130 A JP 2007216130A JP 2006038702 A JP2006038702 A JP 2006038702A JP 2006038702 A JP2006038702 A JP 2006038702A JP 2007216130 A JP2007216130 A JP 2007216130A
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nox
exhaust gas
denitrification
denitration
equipment
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Toshiki Isobe
敏樹 磯部
Yukihiro Baba
幸裕 馬場
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JFE Steel Corp
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JFE Steel Corp
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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a denitrification process and a denitrification equipment for optimizing a unit consumption of energy in denitrification of NOx-containing exhaust gas generated in a pickling line of stainless steel strips by ammonia catalytic reduction. <P>SOLUTION: The denitrification process is characterized in that an amount of air to be supplied is regulated at the inlet of the denitrification equipment according to an amount of NOx generation, and exhaust gas of a constant NOx concentration is supplied to the denitrification equipment. The denitrification equipment for NOx-containing exhaust gas is provided with an air flow damper and a NOx densitometer at the inlet of the denitrification equipment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ステンレス鋼帯の酸洗ラインなどで発生するNOxを含む排ガスを、アンモニア接触還元により脱硝する方法および設備に関する。   The present invention relates to a method and equipment for denitrating exhaust gas containing NOx generated in a pickling line of a stainless steel strip or the like by catalytic reduction of ammonia.

ステンレス鋼帯の酸洗ラインでは、酸洗液に硝酸を使用しているため、そこから排出される排ガス中にはNOxが含まれる。そのため、アンモニア接触還元方式の排ガス脱硝設備を用いて排ガスの低NOx化が図られている。通常は、NOx発生源においてNOxが発生源近傍の周囲へ漏洩するのを防ぐために、排ガスをファンなどで吸引し、一定風量で脱硝装置へ供給し、NOxとアンモニアを接触反応させるために250〜350℃で加熱している。   Since the pickling line for stainless steel strip uses nitric acid for the pickling solution, the exhaust gas discharged from it contains NOx. Therefore, NOx reduction of exhaust gas is attempted using an ammonia catalytic reduction type exhaust gas denitration facility. Normally, in order to prevent NOx from leaking to the vicinity of the source near the NOx generation source, the exhaust gas is sucked with a fan or the like, supplied to the denitration device with a constant air flow, and NOx and ammonia are contacted to 250 to Heated at 350 ° C.

また、排ガス中のNOx量はステンレス鋼帯の種類やサイズなどによって異なるが、それには、特許文献1や特許文献2に記載されているように、アンモニアの注入量を制御して対応している。
特開平11-347368号公報 特開2002-28449号公報 Further, the amount of NOx in the exhaust gas varies depending on the type and size of the stainless steel strip, and this is dealt with by controlling the injection amount of ammonia as described in Patent Document 1 and Patent Document 2. .
Japanese Patent Laid-Open No. 11-347368 Japanese Patent Laid-Open No. 2002-28449

しかしながら、脱硝装置への供給風量は、NOxの発生量が多いときでも発生源近傍の周囲への漏洩を防ぐために大きな風量に設定されているため、NOxの発生量が少ない場合でも加熱のために常に一定の熱量が必要であり、エネルギー原単位が高いという問題がある。   However, the amount of air supplied to the denitration equipment is set to a large air volume to prevent leakage to the vicinity of the source even when the amount of NOx generated is large. There is a problem that a constant amount of heat is always required and the energy intensity is high.

本発明は、ステンレス鋼帯の酸洗ラインなどで発生するNOxを含む排ガスをアンモニア接触還元により脱硝する際に、エネルギー原単位を最適化するための脱硝方法および脱硝設備を提供することを目的とする。   An object of the present invention is to provide a denitration method and a denitration facility for optimizing an energy intensity when denitrating exhaust gas containing NOx generated in a pickling line of a stainless steel strip by ammonia catalytic reduction. To do.

上記の目的は、NOxの発生量に応じて脱硝装置の入側で供給風量を調整し、一定のNOx濃度の排ガスを脱硝装置へ供給することを特徴とする含NOx排ガスの脱硝方法により達成される。   The above object is achieved by a denitration method for NOx-containing exhaust gas, characterized in that the supply air volume is adjusted on the inlet side of the denitration device according to the amount of NOx generated and exhaust gas having a constant NOx concentration is supplied to the denitration device. The

供給風量の調整には、風量ダンパーを用いることができる。   An air volume damper can be used to adjust the supply air volume.

本発明の脱硝方法は、脱硝装置の入側に、風量ダンパーとNOx濃度計を備えたことを特徴とする含NOx排ガスの脱硝設備により実現できる。   The denitration method of the present invention can be realized by a denitration facility for NOx-containing exhaust gas characterized in that an airflow damper and a NOx concentration meter are provided on the inlet side of the denitration apparatus.

本発明の脱硝方法により、ステンレス鋼帯の酸洗ラインなどで発生するNOxを含む排ガスをアンモニア接触還元により脱硝する際に、エネルギー原単位を最適化することが可能になった。   The denitration method of the present invention makes it possible to optimize the energy intensity when denitrating exhaust gas containing NOx generated in a pickling line of a stainless steel strip or the like by catalytic reduction of ammonia.

図1に、本発明である含NOx排ガスの脱硝設備の一例を示す。NOx発生源1では、NOxの発生量によらず発生源近傍の周囲への漏洩を防ぐために、排ガスは大きな一定の風量で吸引され、脱硝装置4へ供給される。大きな風量で排ガスが脱硝装置4へ吹き込まれると温度低下が起こるため、アンモニア接触還元による脱硝反応に必要な加熱のためのエネルギー原単位が高くなる。そこで、NOxの発生量が少ない場合は、脱硝装置4の入側に設けた風量ダンパー2の開度を絞り、発生量が多い場合と同じ濃度までNOx濃度を高めた、すなわち常にNOx濃度が一定にされた排ガスを脱硝装置4へ供給すれば、供給風量を小さくでき、余分なエネルギーが消費されることはなく、エネルギー原単位を最適化できることになる。このとき、脱硝装置4の入側に設けたNOx濃度計3をモニターしながら風量ダンパー2の開度を調整すれば、NOx濃度が一定の排ガスを脱硝装置4へ供給できる。   FIG. 1 shows an example of a NOx-containing exhaust gas denitration facility according to the present invention. In the NOx generation source 1, the exhaust gas is sucked with a large and constant air volume and supplied to the denitration device 4 in order to prevent leakage to the vicinity of the generation source regardless of the generation amount of NOx. When exhaust gas is blown into the denitration apparatus 4 with a large air volume, the temperature is lowered, so that the energy intensity for heating required for the denitration reaction by ammonia catalytic reduction increases. Therefore, when the amount of NOx generated is small, the opening of the air volume damper 2 provided on the entry side of the denitration device 4 is narrowed, and the NOx concentration is increased to the same concentration as when the amount generated is large, that is, the NOx concentration is always constant. If the exhausted exhaust gas is supplied to the denitration device 4, the amount of supplied air can be reduced, no extra energy is consumed, and the energy intensity can be optimized. At this time, exhaust gas with a constant NOx concentration can be supplied to the denitration device 4 by adjusting the opening degree of the air flow damper 2 while monitoring the NOx concentration meter 3 provided on the inlet side of the denitration device 4.

風量ダンパー2の開度の下限としては、NOx発生源1直後の圧力が負圧を維持できるまで絞ることが可能である。これ以上絞るとNOx発生源1周辺にNOxが漏洩する。開度の上限は、特に制約されず、設備上可能な範囲で決定できる。   The lower limit of the opening degree of the air volume damper 2 can be reduced until the pressure immediately after the NOx generation source 1 can maintain the negative pressure. If it is further reduced, NOx leaks around the NOx source 1. The upper limit of the opening is not particularly limited and can be determined within a range that is possible on the equipment.

なお、脱硝装置4の出側に設けたNOx濃度計5は、脱硝装置4内の脱硝反応を制御するためのもので、出側のNOx濃度が高くなった場合は、特許文献1や特許文献2に記載されているように、アンモニアの注入量が調整される。   The NOx concentration meter 5 provided on the exit side of the denitration device 4 is for controlling the denitration reaction in the denitration device 4, and when the NOx concentration on the exit side becomes high, Patent Document 1 and Patent Document As described in 2, the injection amount of ammonia is adjusted.

実際に、ステンレス鋼帯の酸洗ラインに、本発明である脱硝設備を設置し、本発明の脱硝方法にしたがい、風量ダンパーの開度を調整してNOx濃度を1000ppmに一定した排ガスを脱硝装置へ供給したところ、エネルギー原単位を従来の80Mcal/tから55Mcal/tまで低減できた。   Actually, the denitration equipment according to the present invention is installed in the pickling line of the stainless steel strip, and according to the denitration method of the present invention, the exhaust gas whose NOx concentration is fixed at 1000 ppm by adjusting the opening of the air volume damper is removed. The energy intensity was reduced from 80 Mcal / t to 55 Mcal / t.

本発明である含NOx排ガスの脱硝設備の一例を模式的に示す図である。It is a figure which shows typically an example of the denitration equipment of NOx containing exhaust gas which is this invention.

符号の説明Explanation of symbols

1 NOx発生源
2 風量ダンパー
3 入側のNOx濃度計
4 脱硝装置
5 出側のNOx濃度計 1 NOx source
2 Airflow damper
3 Inlet NOx concentration meter
4 Denitration equipment
5 Outgoing NOx concentration meter

Claims (3)

NOxの発生量に応じて脱硝装置の入側で供給風量を調整し、一定のNOx濃度の排ガスを脱硝装置へ供給することを特徴とする含NOx排ガスの脱硝方法。   A denitration method for NOx-containing exhaust gas, wherein the supply air volume is adjusted on the inlet side of the denitration device according to the amount of NOx generated, and exhaust gas having a constant NOx concentration is supplied to the denitration device. 供給風量の調整を、風量ダンパーを用いて行うことを特徴とする請求項1に記載の含NOx排ガスの脱硝方法。   2. The NOx-containing exhaust gas denitration method according to claim 1, wherein the supply air volume is adjusted using an air volume damper. 脱硝装置の入側に、風量ダンパーとNOx濃度計を備えたことを特徴とする含NOx排ガスの脱硝設備。   Denitration equipment for NOx-containing exhaust gas, which is equipped with an air flow damper and NOx concentration meter on the inlet side of the denitration equipment.
JP2006038702A 2006-02-16 2006-02-16 Denitrification process and denitrification equipment for nox-containing exhaust gas Pending JP2007216130A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106582283A (en) * 2016-07-20 2017-04-26 西可林控制系统(上海)有限公司 Control method for SCR tail gas denitration treatment equipment of discontinuous metal section nitric acid-containing pickling line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106582283A (en) * 2016-07-20 2017-04-26 西可林控制系统(上海)有限公司 Control method for SCR tail gas denitration treatment equipment of discontinuous metal section nitric acid-containing pickling line
CN106582283B (en) * 2016-07-20 2022-12-09 西可林控制系统(上海)有限公司 Control method of tail gas denitration treatment equipment of discontinuous metal section pickling line

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