JPH11104437A - Circulation pipeline acid cleaning type exhaust gas treatment tower - Google Patents
Circulation pipeline acid cleaning type exhaust gas treatment towerInfo
- Publication number
- JPH11104437A JPH11104437A JP9270267A JP27026797A JPH11104437A JP H11104437 A JPH11104437 A JP H11104437A JP 9270267 A JP9270267 A JP 9270267A JP 27026797 A JP27026797 A JP 27026797A JP H11104437 A JPH11104437 A JP H11104437A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- absorbing
- circulation
- liq
- liquid
- 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
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、汚泥焼却炉、ボイ
ラー、発電装置等における排煙処理塔に関する。The present invention relates to a flue gas treatment tower in a sludge incinerator, a boiler, a power generator, and the like.
【０００２】[0002]
【従来の技術】従来、例えば汚泥焼却炉においては、排
ガス中のＨＣＬ、ＳＯｘ、ＨＣＮ、煤塵等の除去を目的
として排煙処理塔を設けている。排煙処理塔において
は、排ガスを塔内に上向流で供給し、排ガスと塔内に噴
霧する吸収液との気液接触により、排ガス中のＨＣＬ、
ＳＯｘ、ＨＣＮ、煤塵を吸収除去している。循環利用す
る吸収液は、そのｐＨが高いほどにＨＣＬ、ＳＯｘ、Ｈ
ＣＮに対する吸収能が良いが、ＨＣＬ、ＳＯｘ、ＨＣＮ
の吸収によってｐＨが３〜４に低下するので、ＮａＯＨ
の添加によってｐＨを７程度に維持している。2. Description of the Related Art Conventionally, for example, in a sludge incinerator, a flue gas treatment tower is provided for the purpose of removing HCL, SOx, HCN, dust and the like in exhaust gas. In the flue gas treatment tower, the exhaust gas is supplied in an upward flow into the tower, and HCL in the exhaust gas,
SOx, HCN and dust are absorbed and removed. The higher the pH of the absorbing solution to be circulated, the higher the HCL, SOx,
Good absorption capacity for CN, but HCL, SOx, HCN
The pH is lowered to 3 to 4 by the absorption of
The pH is maintained at around 7 by the addition of.
【０００３】[0003]
【発明が解決しようとする課題】上記した構成におい
て、汚泥焼却炉の排ガス中の煤塵はその組成分としてＣ
ａＯを含んでおり、ＣａＯは排ガス中のＣＯ2と反応し
てＣａＣＯ3を生成する。このＣａＣＯ3は過飽和溶液を
作り易く、吸収液のｐＨが高いほどに吸収液の循環配管
中にスケールを生じ易い。このスケールを原因として循
環配管に閉塞が生起すると、排煙処理塔の運転停止のみ
ならず、汚泥焼却炉を含む全炉設備の運転を停止する状
態で循環配管を解体して洗浄する必要があり、高圧洗浄
機により長時間にわたる配管の洗浄作業と組み立て復旧
作業を要する問題があった。In the above construction, the dust in the exhaust gas of the sludge incinerator is C component as its component.
It contains aO, and CaO reacts with CO 2 in exhaust gas to produce CaCO 3 . The CaCO 3 easily forms a supersaturated solution, and the higher the pH of the absorbing solution, the more easily scale is formed in the circulation pipe of the absorbing solution. If clogging occurs in the circulation pipe due to this scale, it is necessary to dismantle and clean the circulation pipe in a state where not only the operation of the flue gas treatment tower but also the operation of all furnace facilities including the sludge incinerator is stopped. In addition, there is a problem that a long time cleaning work of pipes and an assembling restoration work are required by a high pressure washer.
【０００４】本発明は上記した課題を解決するものであ
り、循環配管の解体を伴う洗浄作業を要することなく、
短時間に配管の洗浄を行なうことができる循環配管酸洗
浄型排煙処理塔を提供することを目的とする。[0004] The present invention solves the above-mentioned problems, and eliminates the need for cleaning work involving dismantling of a circulation pipe.
An object of the present invention is to provide a circulating pipe acid cleaning type flue gas treatment tower capable of cleaning a pipe in a short time.
【０００５】[0005]
【課題を解決するための手段】上記した課題を解決する
ために、本発明の循環配管酸洗浄型排煙処理塔は、吸収
液が噴出するスプレーノズルと、噴出した吸収液が排ガ
スと気液接触する吸収部と、排ガス中の有害成分を吸収
した吸収液が滞留する循環タンク部とを塔本体内に有
し、循環タンク部の吸収液を吸収液循環配管系を通して
スプレーノズルに循環する排煙処理塔において、吸収液
循環配管系に酸洗浄液を供給する洗浄液循環配管系を、
吸収液循環配管系の起端側と終端側に管路切換手段を介
して接続したものである。In order to solve the above-mentioned problems, an acid-cleaning type flue gas treatment tower according to the present invention comprises a spray nozzle from which an absorbent is ejected, and an ejected absorbent comprising exhaust gas and gas-liquid. The tower body has an absorbing section that comes into contact and a circulating tank section in which the absorbing liquid that has absorbed the harmful components in the exhaust gas stays, and the absorbing liquid in the circulating tank section is circulated to the spray nozzle through the absorbing liquid circulating piping system. In the smoke treatment tower, the cleaning liquid circulation piping system that supplies the acid cleaning liquid to the absorption liquid circulation piping system,
The absorption liquid circulation piping system is connected to the start and end sides of the absorption liquid circulation system via pipe switching means.
【０００６】上記した構成により、通常状態において、
スプレーノズルから噴出する吸収液は、吸収部において
排ガスと気液接触して排ガス中の有害成分を吸収し、循
環タンク部に滞留する。循環タンク部の吸収液は吸収液
循環配管系を通してスプレーノズルに循環する。この吸
収液の循環によって排ガス中に煤塵として含まれるカル
シウム成分が吸収液循環配管系に流入し、管壁面にスケ
ールを形成する。このスケールを除去するために、洗浄
時には、管路切換手段を操作して吸収液循環配管系と塔
本体との連通を遮断するとともに、吸収液循環配管系と
洗浄液循環配管系を連通し、酸洗浄液を吸収液循環配管
系に循環通液し、スケールを酸洗浄して分解除去する。According to the above configuration, in a normal state,
The absorbing liquid ejected from the spray nozzle comes into gas-liquid contact with the exhaust gas in the absorbing section to absorb harmful components in the exhaust gas and stay in the circulation tank. The absorbent in the circulation tank circulates to the spray nozzle through the absorbent circulation piping system. Due to the circulation of the absorbing solution, the calcium component contained in the exhaust gas as dust flows into the absorbing solution circulating piping system and forms scale on the pipe wall surface. In order to remove this scale, at the time of washing, the pipe switching means is operated to cut off the communication between the absorbent circulation pipe system and the tower body, and at the same time, the absorption liquid circulation pipe system and the washing liquid circulation pipe system are communicated with each other. The washing liquid is circulated through the absorption liquid circulation pipe system, and the scale is decomposed and removed by acid washing.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて説明する。図１において、排煙処理塔１は、塔
本体２の底部に吸収液３が滞留する循環タンク部４を形
成し、塔本体２の下部位置に排ガス５を導入する排ガス
流入口６を設け、塔本体２の上部位置に吸収液３を噴出
する吸収液スプレーノズル７を配置している。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the flue gas treatment tower 1 forms a circulation tank part 4 in which the absorbent 3 stays at the bottom of the tower body 2, and provides an exhaust gas inlet 6 for introducing the exhaust gas 5 at a lower position of the tower body 2. An absorption liquid spray nozzle 7 for ejecting the absorption liquid 3 is disposed at an upper position of the tower main body 2.
【０００８】塔本体２は、排ガス流入口６と吸収液スプ
レーノズル７との間の塔内空間が吸収液３と排ガス５と
が気液接触する吸収部８を形成し、吸収液スプレーノズ
ル７より上方の塔内空間が冷却部９を形成している。冷
却部９には、上部位置に冷却洗浄水スプレーノズル１０
を配置し、冷却部９の下部位置に冷却洗浄水を受け止め
る充填層１１を設けており、充填層１１と循環タンク部
４の間に充填層１１で集水した冷却洗浄水を循環タンク
部４に導くバイパス管路１２を設けている。塔本体２の
頂部には処理排ガス１３ａを次系に導く処理排ガス排出
口１３を設けている。In the tower body 2, the space in the tower between the exhaust gas inlet 6 and the absorbing liquid spray nozzle 7 forms an absorbing section 8 in which the absorbing liquid 3 and the exhaust gas 5 come into gas-liquid contact. The upper space in the tower forms the cooling unit 9. The cooling unit 9 includes a cooling water spray nozzle 10 at an upper position.
Is provided at a lower position of the cooling unit 9 to receive the cooling washing water. The cooling washing water collected by the filling layer 11 between the filling layer 11 and the circulation tank unit 4 is supplied to the circulation tank unit 4. Is provided. At the top of the tower body 2, a treated exhaust gas outlet 13 for guiding the treated exhaust gas 13a to the next system is provided.
【０００９】塔本体２の底部には、吸収液排出弁１４を
介装した吸収液３の排出管路１５が循環タンク部４の下
部に連通して接続し、吸収液３のｐＨを計測するための
ｐＨ計１６を備えたｐＨ計測系１７が塔本体２の側部に
連通して接続しており、塔本体２の上部には、冷却洗浄
水供給弁１８を介装した冷却洗浄水の供給管路１９が冷
却洗浄水スプレーノズル１０にして連通して接続してい
る。At the bottom of the tower body 2, a discharge line 15 for the absorbent 3 with an absorbent discharge valve 14 interposed is connected to the lower part of the circulation tank 4 so as to measure the pH of the absorbent 3. PH measuring system 17 provided with a pH meter 16 for communication is connected to the side of the tower main body 2 in communication with the side of the tower main body 2. A supply pipe line 19 communicates with and connects to the cooling / washing water spray nozzle 10.
【００１０】排煙処理塔１は、循環タンク部４の吸収液
を吸収液スプレーノズル７に循環供給する吸収液循環配
管系２０を有しており、吸収液循環配管系２０は、循環
タンク部４に連通する起端側と吸収液スプレーノズル７
に連通する終端側とに位置して、管路切換手段をなす第
１開閉弁２１および第２開閉弁２２を有しており、系の
途中に循環ポンプ２３および流量計２４を有している。
吸収液循環配管系２０の途中には、ｐＨ調整剤としてＮ
ａＯＨを供給する薬剤供給管２５が薬剤供給弁２６を介
して接続している。The flue gas treatment tower 1 has an absorption liquid circulation piping system 20 for circulating the absorption liquid in the circulation tank unit 4 to the absorption liquid spray nozzle 7, and the absorption liquid circulation piping system 20 includes a circulation tank unit. Start side communicating with 4 and absorbent spray nozzle 7
A first opening / closing valve 21 and a second opening / closing valve 22 serving as conduit switching means are located at a terminal end side communicating with the pump, and a circulation pump 23 and a flow meter 24 are provided in the middle of the system. .
In the middle of the absorbent circulation piping system 20, N is used as a pH adjuster.
A medicine supply pipe 25 for supplying aOH is connected via a medicine supply valve 26.
【００１１】吸収液循環配管系２０には酸洗浄液２７を
供給する洗浄液循環配管系２８が接続しており、洗浄液
循環配管系２８は吸収液循環配管系２０に、第１開閉弁
２１の下流側近傍と第２開閉弁２２の上流側近傍の位置
において、管路切換手段をなす第３開閉弁２９および第
４開閉弁３０を介して連通しており、系の途中に酸洗浄
液２７を貯留する酸貯留槽３１を有している。尚、管路
切換手段としては三方弁等を使用することも可能であ
る。A cleaning liquid circulation piping system 28 for supplying an acid cleaning liquid 27 is connected to the absorption liquid circulation piping system 20. The cleaning liquid circulation piping system 28 is connected to the absorption liquid circulation piping system 20 on the downstream side of the first opening / closing valve 21. The vicinity and a position near the upstream side of the second on-off valve 22 communicate with each other via a third on-off valve 29 and a fourth on-off valve 30 forming a pipeline switching means, and store the acid cleaning liquid 27 in the middle of the system. It has an acid storage tank 31. It should be noted that a three-way valve or the like can be used as the pipeline switching means.
【００１２】以下に上記した構成おける作用を説明す
る。通常状態において、冷却洗浄水供給弁１８、第１開
閉弁２１および第２開閉弁２２は開栓し、吸収液排出弁
１４、第３開閉弁２９および第４開閉弁３０は閉栓して
いる。The operation of the above configuration will be described below. In the normal state, the cooling / washing water supply valve 18, the first opening / closing valve 21 and the second opening / closing valve 22 are opened, and the absorbent discharge valve 14, the third opening / closing valve 29, and the fourth opening / closing valve 30 are closed.
【００１３】この状態において、排ガス流入口６から塔
本体２に流入する排ガス５は上向流で吸収部８を通過す
る。吸収液スプレーノズル７から噴出する吸収液３は吸
収部８において排ガス５と気液接触して排ガス５中の有
害成分であるＨＣＬ、ＳＯｘ、ＨＣＮ、煤塵を吸収し、
循環タンク部４に滞留する。有害成分を吸収除去した排
ガス５は充填層１１を通って冷却部９を上向流で通過す
る。冷却洗浄水スプレーノズル１０から噴出する冷却洗
浄水は、冷却部８において接触する排ガス５を洗浄する
とともに適温にまで冷却する。その後に、充填層１１に
達した冷却洗浄水はバイパス管路１２を通って処理排ガ
ス１３ａは処理排ガス排出口１３から系外へ流れ出る。In this state, the exhaust gas 5 flowing into the tower main body 2 from the exhaust gas inlet 6 passes through the absorber 8 in an upward flow. The absorbing liquid 3 ejected from the absorbing liquid spray nozzle 7 comes into gas-liquid contact with the exhaust gas 5 in the absorbing section 8 to absorb HCL, SOx, HCN, and dust, which are harmful components in the exhaust gas 5,
It stays in the circulation tank unit 4. The exhaust gas 5 from which harmful components have been absorbed and removed passes through the packed bed 11 and passes through the cooling unit 9 in an upward flow. The cooling water sprayed from the cooling water spray nozzle 10 cleans the contacting exhaust gas 5 in the cooling unit 8 and cools the exhaust gas 5 to an appropriate temperature. After that, the cooling cleaning water that has reached the packed bed 11 passes through the bypass pipe 12, and the treated exhaust gas 13 a flows out of the treated exhaust gas outlet 13 out of the system.
【００１４】循環タンク部４に滞留する吸収液３は、循
環ポンプ２３の駆動により吸収液循環配管系２０を介し
て冷却洗浄水スプレーノズル１０に循環し、一部がｐＨ
計測系１７を通して常に流出し、そのｐＨをｐＨ計１６
で計測する。吸収液３は吸収液循環配管系２０の途中に
おいて薬剤供給管２５から供給するＮａＯＨの添加によ
りｐＨを７に維持する。The absorbent 3 retained in the circulation tank 4 is circulated to the cooling water spray nozzle 10 through the absorbent circulation pipe system 20 by driving the circulation pump 23, and a part of the pH is adjusted to pH.
It constantly flows out through the measuring system 17 and its pH is measured with a pH meter 16.
Measure with The pH of the absorbing liquid 3 is maintained at 7 by adding NaOH supplied from the chemical supply pipe 25 in the middle of the absorbing liquid circulation piping system 20.
【００１５】吸収液３の循環が継続すると、吸収液循環
配管系２０に流入する煤塵のカルシウム成分により管壁
面にスケールが生じる。このスケールを除去するため
に、洗浄時には、第１開閉弁２１および第２開閉弁２２
を閉栓して吸収液循環配管系２０と塔本体２との連通を
遮断し、第３開閉弁２９および第４開閉弁３０を開栓し
て吸収液循環配管系２０と洗浄液循環配管系２８を連通
する。When the absorption liquid 3 continues to circulate, scale is generated on the pipe wall surface due to the calcium component of the dust flowing into the absorption liquid circulation piping system 20. In order to remove this scale, the first on-off valve 21 and the second on-off valve 22
Is closed to cut off the communication between the absorbent circulation pipe system 20 and the tower main body 2, and the third on-off valve 29 and the fourth on-off valve 30 are opened to disconnect the absorption liquid circulation pipe system 20 and the washing liquid circulation pipe system 28. Communicate.
【００１６】この状態で、循環ポンプ２３の駆動によ
り、酸貯留槽３１の酸洗浄液２７が洗浄液循環配管系２
８と吸収液循環配管系２０とに亘って循環することによ
り、短時間でスケールを酸洗浄して分解除去する。洗浄
作業が終了した時点で、第１開閉弁２１および第２開閉
弁２２を開栓し、第３開閉弁２９および第４開閉弁３０
を閉栓する。系内に残留する酸は、通常運転時に添加す
るＮａＯＨによって中和する。In this state, when the circulation pump 23 is driven, the acid cleaning liquid 27 in the acid storage tank 31 is supplied to the cleaning liquid circulation piping system 2.
By circulating through 8 and the absorption liquid circulation piping system 20, the scale is acid-washed in a short time to be decomposed and removed. When the cleaning operation is completed, the first on-off valve 21 and the second on-off valve 22 are opened, and the third on-off valve 29 and the fourth on-off valve 30 are opened.
Close the cap. The acid remaining in the system is neutralized by NaOH added during normal operation.
【００１７】[0017]
【発明の効果】以上述べたように、本発明によれば、管
路切換手段を操作して吸収液循環配管系と塔本体との連
通を遮断するとともに、吸収液循環配管系と洗浄液循環
配管系を連通し、酸洗浄液を吸収液循環配管系に循環通
液し、スケールを酸洗浄して分解除去することができる
ので、循環配管の解体を伴うことなく、短時間に配管の
洗浄を行なうことができる。As described above, according to the present invention, the pipe line switching means is operated to cut off the communication between the absorbent circulation pipe system and the tower main body, and the absorption liquid circulation pipe system and the washing liquid circulation pipe. The system can be connected to the system to circulate the acid washing liquid through the absorption liquid circulation piping system, and the scale can be washed and pickled by acid cleaning, so that the piping can be cleaned in a short time without dismantling the circulation piping. be able to.
【図１】本発明の実施形態を示す循環配管酸洗浄型排煙
処理塔である。FIG. 1 is a diagram showing an acid-cleaning type flue gas treatment tower for circulation piping showing an embodiment of the present invention.
１ 排煙処理塔 ２ 塔本体 ３ 吸収液 ４ 循環タンク部 ５ 排ガス ６ 排ガス流入口 ７ 吸収液スプレーノズル ８ 吸収部 １３ 処理排ガス排出口 ２０ 吸収液循環配管系 ２１ 第１開閉弁 ２２ 第２開閉弁 ２３ 循環ポンプ ２７ 酸洗浄液 ２８ 洗浄液循環配管系 ２９ 第３開閉弁 ３０ 第４開閉弁 ３１ 酸貯留槽 DESCRIPTION OF SYMBOLS 1 Smoke exhaust treatment tower 2 Tower main body 3 Absorbent 4 Circulation tank part 5 Exhaust gas 6 Exhaust gas inlet 7 Absorbent spray nozzle 8 Absorber 13 Treated exhaust gas outlet 20 Absorbent liquid circulation piping system 21 First on-off valve 22 Second on-off valve 23 Circulating pump 27 Acid cleaning liquid 28 Cleaning liquid circulation piping system 29 Third on-off valve 30 Fourth on-off valve 31 Acid storage tank
Claims (1)
出した吸収液が排ガスと気液接触する吸収部と、排ガス
中の有害成分を吸収した吸収液が滞留する循環タンク部
とを塔本体内に有し、循環タンク部の吸収液を吸収液循
環配管系を通してスプレーノズルに循環する排煙処理塔
において、吸収液循環配管系に酸洗浄液を供給する洗浄
液循環配管系を、吸収液循環配管系の起端側と終端側に
管路切換手段を介して接続したことを特徴とする循環配
管酸洗浄型排煙処理塔。1. A tower main body comprising: a spray nozzle from which an absorbing liquid is jetted; an absorbing section in which the jetted absorbing liquid comes into gas-liquid contact with exhaust gas; In the flue gas treatment tower that circulates the absorption liquid in the circulation tank to the spray nozzle through the absorption liquid circulation piping system, the cleaning liquid circulation piping system that supplies the acid cleaning liquid to the absorption liquid circulation piping system has an absorption liquid circulation piping system. A circulating pipe acid-cleaning type flue gas treatment tower, which is connected to the starting side and the terminating side of the circulating pipe via pipe switching means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9270267A JPH11104437A (en) | 1997-10-03 | 1997-10-03 | Circulation pipeline acid cleaning type exhaust gas treatment tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9270267A JPH11104437A (en) | 1997-10-03 | 1997-10-03 | Circulation pipeline acid cleaning type exhaust gas treatment tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11104437A true JPH11104437A (en) | 1999-04-20 |
Family
ID=17483879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9270267A Pending JPH11104437A (en) | 1997-10-03 | 1997-10-03 | Circulation pipeline acid cleaning type exhaust gas treatment tower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11104437A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002239339A (en) * | 2001-02-15 | 2002-08-27 | Ishikawajima Harima Heavy Ind Co Ltd | Wet type flue gas desulfurization apparatus |
| JP2011147881A (en) * | 2010-01-21 | 2011-08-04 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co Ltd | Exhaust gas treatment apparatus and method of operating the same |
-
1997
- 1997-10-03 JP JP9270267A patent/JPH11104437A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002239339A (en) * | 2001-02-15 | 2002-08-27 | Ishikawajima Harima Heavy Ind Co Ltd | Wet type flue gas desulfurization apparatus |
| JP2011147881A (en) * | 2010-01-21 | 2011-08-04 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co Ltd | Exhaust gas treatment apparatus and method of operating the same |
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