JPH07232088A - Soot blow in denitration device - Google Patents

Soot blow in denitration device

Info

Publication number
JPH07232088A
JPH07232088A JP6027716A JP2771694A JPH07232088A JP H07232088 A JPH07232088 A JP H07232088A JP 6027716 A JP6027716 A JP 6027716A JP 2771694 A JP2771694 A JP 2771694A JP H07232088 A JPH07232088 A JP H07232088A
Authority
JP
Japan
Prior art keywords
exhaust gas
denitration
gas
dust
type
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.)
Withdrawn
Application number
JP6027716A
Other languages
Japanese (ja)
Inventor
Tadayuki Aoki
忠幸 青木
Nobuo Matsumoto
信夫 松本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP6027716A priority Critical patent/JPH07232088A/en
Publication of JPH07232088A publication Critical patent/JPH07232088A/en
Withdrawn legal-status Critical Current

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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

PURPOSE:To obtain a soot blow method which solves problems encountered when using vapor or air as an ejection medium by using a denitrated exhaust gas as the surface of a catalyst layer for an exhaust gas contact-type denitration device. CONSTITUTION:An exhaust gas ejected from various combustion devices is conducted through a two-tier denitration catalyting layer 2 of fixed type in a contact-type denitration device 1 to selectively remove a nitrogen oxide from the exhaust gas by reduction process. After cooling and filtering dust from the denitrated exhaust gas with the help of a heat exchange and dust removal device 3, the gas is exhausted by an exhaust fan 4. A traverse-type soot blow device 6 is installed at a required distance above the device 2. Further, the denitrated exhaust gas flowing out of a fan 4 is partly guided to a dust collector 7, then is pressurized using a compressor 8, and is sent to the device 6 through a valve 10 after the stabilization of the gas pressure by an accumulator 9. Finally the exhaust gas is blown to the surface of the device 2, that is, the upstream area of a gas stream.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、石炭焚きボイラなど
の各種燃焼装置から排出される排ガスを固定床式の脱硝
触媒層に通して排ガス中の窒素酸化物を選択的に還元除
去する接触式脱硝装置において、触媒層表面に蓄積した
ダストをスートブローする方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic type in which exhaust gas discharged from various combustion devices such as a coal-fired boiler is passed through a fixed bed type denitration catalyst layer to selectively reduce and remove nitrogen oxides in the exhaust gas. The present invention relates to a method of soot-blowing dust accumulated on the surface of a catalyst layer in a denitration device.

【0002】[0002]

【従来の技術】接触式脱硝装置の運転に伴って、排ガス
中に含まれるダストが徐々に触媒層表面に蓄積し、触媒
性能を低下させると共に、排ガスの圧力損失を増大させ
る。そこで、ある期間の運転の後、触媒層表面から蓄積
ダストを除去し、触媒の活性を回復してやる必要があ
る。
2. Description of the Related Art With the operation of a catalytic denitration apparatus, dust contained in exhaust gas gradually accumulates on the surface of a catalyst layer, which lowers catalyst performance and increases pressure loss of exhaust gas. Therefore, after a certain period of operation, it is necessary to remove accumulated dust from the surface of the catalyst layer and restore the activity of the catalyst.

【0003】触媒層表面から蓄積ダストを除去するに
は、スートブローを行うのが一般的であり、従来、その
噴出媒体としてはスチームやエアーが用いられていた。
To remove accumulated dust from the surface of the catalyst layer, soot blowing is generally performed, and conventionally, steam or air has been used as the ejection medium.

【0004】[0004]

【発明が解決しようとする課題】しかし、噴出媒体とし
てスチームを用いた場合、つぎのような問題がある。
However, when steam is used as the ejection medium, there are the following problems.

【0005】・スートブローは、一般に1回/1日実施
されるが、この為のドレン切り操作が非常に面倒であ
る。
The soot blow is generally carried out once a day, but the drain cutting operation for this purpose is very troublesome.

【0006】・スチームの噴出による触媒の漏れが触媒
の寿命低下や強度低下を引き起す。 ・スチームが確保しにくい場合があり、また、スチーム
配管が複雑になる場合がある。
Leakage of the catalyst due to jetting of steam causes the life of the catalyst and the strength of the catalyst to be reduced.・ Steam may be difficult to secure, and steam piping may be complicated.

【0007】・スチームの使用による水分の混入は脱硝
反応率を低下させる。
Mixing of water by using steam reduces the denitration reaction rate.

【0008】また、噴出媒体としてエアーを用いた場
合、つぎのような問題がある。
Further, when air is used as the ejection medium, there are the following problems.

【0009】・エアー中に20容積%存在する酸素が、
還元反応である脱硝反応を抑制すると共に、排ガス中の
酸素濃度が上る為、処理済みガス中のNOx濃度計算が
不利となる(通常の排ガス中の酸素濃度は5.0〜1
5.0容積%である)。そのため、噴出エアー中の酸素
が脱硝に対し不利に働く。
Oxygen present in 20% by volume in air is
In addition to suppressing the denitration reaction, which is a reduction reaction, the oxygen concentration in the exhaust gas rises, which is disadvantageous in calculating the NOx concentration in the treated gas (normal oxygen concentration in the exhaust gas is 5.0 to 1).
5.0% by volume). Therefore, oxygen in the jetted air works against denitration.

【0010】・噴出エアーは常温であり、高温の触媒に
熱ショックを与える。
The jet air is at room temperature and gives a heat shock to the catalyst at high temperature.

【0011】この発明は、噴出媒体としてスチームやエ
アーを用いた場合の上記諸問題をすべて解消することが
できるスートブロー方法を提供することを目的とする。
An object of the present invention is to provide a soot-blowing method capable of solving all of the above problems when steam or air is used as a jetting medium.

【0012】[0012]

【課題を解決するための手段】この発明によるスートブ
ロー方法は、上記目的を達成すべく工夫されたものであ
り、排ガスの接触式脱硝装置において触媒層表面に蓄積
したダストをスートブローするに当たり、その噴出媒体
として脱硝処理済み排ガスを用いることを特徴とするも
のである。
The sootblowing method according to the present invention has been devised to achieve the above-mentioned object. When sootblowing the dust accumulated on the catalyst layer surface in the exhaust gas catalytic denitration apparatus, the sootblowing method is adopted. It is characterized in that exhaust gas that has undergone denitration treatment is used as a medium.

【0013】脱硝処理済み排ガスは、通常、熱交換によ
り例えば150〜200℃に冷却されると共に除塵され
た後、系外へ排出される。こうして冷却され除塵された
脱硝処理済み排ガスの一部が、好ましくは再度除塵され
た後、コンプレッサーで加圧されて噴出媒体となされ
る。コンプレッサーの後流にアキュムレータを設けるこ
とにより、コンプレッサーの容量を大幅に下げることが
できる。
The denitration-treated exhaust gas is usually cooled to 150 to 200 ° C. by heat exchange, dust-removed, and then discharged out of the system. A part of the denitration-treated exhaust gas that has been cooled and dedusted in this way is preferably dedusted again and then pressurized by a compressor to be used as an ejection medium. By installing an accumulator in the downstream of the compressor, the capacity of the compressor can be significantly reduced.

【0014】[0014]

【作用】この発明による方法では、その噴出媒体として
脱硝処理済み排ガスを用いて、排ガスの接触式脱硝装置
において触媒層表面に蓄積したダストをスートブローす
るので、噴出媒体としてスチームやエアーを用いた場合
の前述した問題点を生じることなく、ダストを除去する
ことができる。
In the method according to the present invention, the exhaust gas subjected to denitration treatment is used as the ejection medium to soot the dust accumulated on the surface of the catalyst layer in the exhaust gas contact type denitration device. Therefore, when steam or air is used as the ejection medium. The dust can be removed without causing the above-mentioned problems.

【0015】[0015]

【実施例】この発明を図示の実施例により具体的に説明
する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments.

【0016】石炭焚きボイラなどの各種燃焼装置から排
出される排ガスを、接触式脱硝装置(1) の固定床式の上
下2段の脱硝触媒層(2) に通して、排ガス中の窒素酸化
物を選択的に還元除去する。脱硝処理済みの排ガスは熱
交換・除塵装置(3) を通過して150〜200℃に冷却
されると共に除塵された後、排気ファン(4) で煙突(5)
から系外へ排出される。
Exhaust gas discharged from various combustion devices such as a coal-fired boiler is passed through fixed bed type denitrification catalyst layers (2) of the catalytic denitration device (1) to form nitrogen oxides in the exhaust gas. Is selectively reduced and removed. Exhaust gas that has undergone denitration treatment passes through a heat exchange / dust removal device (3), is cooled to 150 to 200 ° C, and is dust-removed, and is then exhausted by an exhaust fan (4) to a stack (5).
Is discharged from the system.

【0017】上下2段の脱硝触媒層(2) の所要距離上方
には、トラバース方式のスートブロー装置(6) がそれぞ
れ設置されている。そして、排気ファン(4) から出た脱
硝処理済みの排ガスの一部が除塵装置(7) へ導かれ、コ
ンプレッサー(8) で加圧され、アキュムレータ(9) によ
るガス圧安定化の後、バルブ(10)を経てスートブロー装
置(6) に送られ、同装置(6) によって脱硝触媒層(2) の
表面、すなわちガス流れの上流面に吹き付けられる。
A traverse type soot blower (6) is installed above the required distance of the upper and lower denitration catalyst layers (2). Then, a part of the denitration-treated exhaust gas from the exhaust fan (4) is guided to the dust remover (7), pressurized by the compressor (8), and stabilized by the accumulator (9), and then the valve. After passing through (10), it is sent to the soot blowing device (6), and is blown onto the surface of the denitration catalyst layer (2), that is, the upstream face of the gas flow, by the device (6).

【0018】上記のように、脱硝処理済み排ガスを冷却
しかつ除塵した後にコンプレッサーに掛けることによ
り、コンプレッサーにおける温度およびダストによる問
題を解決することができる。
As described above, by cooling the denitration-treated exhaust gas and removing the dust and then applying it to the compressor, the problems due to the temperature and dust in the compressor can be solved.

【0019】[0019]

【発明の効果】この発明によるスートブロー方法では、
その噴出媒体として脱硝処理済み排ガスを用いるので、
噴出媒体としてスチームやエアーを用いた場合の前述し
た問題点をすべて解決することができる。
According to the sootblowing method of the present invention,
Since denitration-treated exhaust gas is used as the ejection medium,
It is possible to solve all the above-mentioned problems when steam or air is used as the ejection medium.

【0020】また、この発明によるスートブロー方法
は、噴出媒体としてエアーを用いた場合の設備費とほぼ
等しく設備費で実施することができる。
Further, the soot blowing method according to the present invention can be carried out at a facility cost substantially equal to the facility cost when air is used as the ejection medium.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例を示すフローシートである。FIG. 1 is a flow sheet showing an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1:接触式脱硝装置 2:脱硝触媒層 3:熱交換・除塵装置 4:排気ファン 6:スートブロー装置 7:除塵装置 8:コンプレッサー 9:アキュムレータ 1: Contact type denitration device 2: Denitration catalyst layer 3: Heat exchange / dust removal device 4: Exhaust fan 6: Soot blow device 7: Dust removal device 8: Compressor 9: Accumulator

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 排ガスの接触式脱硝装置において触媒層
表面に堆積したダストをスートブローするに当たり、そ
の噴出媒体として脱硝処理済み排ガスを用いることを特
徴とする、脱硝装置におけるスートブロー方法。
1. A soot-blowing method in a denitration device, wherein when soot-blowing dust accumulated on the surface of a catalyst layer in an exhaust-gas contact-type denitration device, denitration-treated exhaust gas is used as a jetting medium.
JP6027716A 1994-02-25 1994-02-25 Soot blow in denitration device Withdrawn JPH07232088A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6027716A JPH07232088A (en) 1994-02-25 1994-02-25 Soot blow in denitration device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6027716A JPH07232088A (en) 1994-02-25 1994-02-25 Soot blow in denitration device

Publications (1)

Publication Number Publication Date
JPH07232088A true JPH07232088A (en) 1995-09-05

Family

ID=12228738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6027716A Withdrawn JPH07232088A (en) 1994-02-25 1994-02-25 Soot blow in denitration device

Country Status (1)

Country Link
JP (1) JPH07232088A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011528088A (en) * 2009-09-18 2011-11-10 クワン ソン カンパニー リミテッド SCR system with bypass system
WO2014104099A1 (en) * 2012-12-28 2014-07-03 ヤンマー株式会社 Exhaust purification device
CN104258673A (en) * 2014-09-18 2015-01-07 中冶焦耐工程技术有限公司 Middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device
CN115708995A (en) * 2022-10-20 2023-02-24 江苏百茂源环保科技有限公司 Dioxin catalytic decomposition device and decomposition method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011528088A (en) * 2009-09-18 2011-11-10 クワン ソン カンパニー リミテッド SCR system with bypass system
WO2014104099A1 (en) * 2012-12-28 2014-07-03 ヤンマー株式会社 Exhaust purification device
JP2014128762A (en) * 2012-12-28 2014-07-10 Yanmar Co Ltd Exhaust emission control device
CN104258673A (en) * 2014-09-18 2015-01-07 中冶焦耐工程技术有限公司 Middle-low-temperature flue gas desulfurization, dedusting and denitration and denitration catalyst thermal-desorption integrated device
CN104258673B (en) * 2014-09-18 2016-04-06 中冶焦耐工程技术有限公司 The denitration of middle low-temperature flue gas desulfurization and dedusting and denitrating catalyst Thermal desorption integrated apparatus
CN115708995A (en) * 2022-10-20 2023-02-24 江苏百茂源环保科技有限公司 Dioxin catalytic decomposition device and decomposition method thereof

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20010508