JPH06142448A - Wet type stack gas desulfurizing method and device - Google Patents
Wet type stack gas desulfurizing method and deviceInfo
- Publication number
- JPH06142448A JPH06142448A JP4301935A JP30193592A JPH06142448A JP H06142448 A JPH06142448 A JP H06142448A JP 4301935 A JP4301935 A JP 4301935A JP 30193592 A JP30193592 A JP 30193592A JP H06142448 A JPH06142448 A JP H06142448A
- Authority
- JP
- Japan
- Prior art keywords
- absorption tower
- exhaust gas
- waste water
- duct
- wastewater
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は湿式排煙脱硫装置に係
り、特に脱硫排水を低減する排水量低減方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet flue gas desulfurization apparatus, and more particularly to a method for reducing the amount of desulfurization wastewater.
【０００２】[0002]
【従来の技術】大気汚染防止のため、排ガス中の硫黄酸
化物の除去方法として、湿式石灰石−石膏脱硫方法が広
く実用化されている。化石燃料を燃焼するボイラからの
排ガスに適用される湿式排煙脱硫装置は硫黄酸化物を除
去するだけでなく、排ガス中のばい塵、ハロゲンガス
（主に、ＨＣｌ、ＨＦ）も除去している。従来の湿式排
煙脱硫装置のフローを図４に示す。ボイラ１からの排ガ
ス２は、通常は乾式集塵機３で排ガス中のばい塵が除去
された後、吸収塔５に導かれる。吸収塔５では吸収剤ス
ラリを循環ライン４を通して循環スプレーさせ、排ガス
中の硫黄酸化物（ＳＯ2など）を除去するとともに、乾
式集塵機３で除去しきれなかったばい塵およびハロゲン
化合物を除去する。硫黄酸化物などを吸収した吸収剤ス
ラリの一部は、シックナ７へ送られ、濃縮されたスラリ
は石膏脱水機８で脱水され、反応生成物である石膏９が
回収される。吸収塔５では、排ガスは循環される吸収剤
スラリにより冷却されるため、吸収剤スラリ中の水が蒸
発する。そこで、蒸発水分を補うため、工業用水および
シックナ上澄水がライン１０を経て吸収塔戻りライン１
１から吸収塔５へ供給される。2. Description of the Related Art In order to prevent air pollution, a wet limestone-gypsum desulfurization method has been widely put into practical use as a method for removing sulfur oxides in exhaust gas. A wet flue gas desulfurization device applied to exhaust gas from a boiler burning fossil fuel not only removes sulfur oxides, but also removes dust and halogen gas (mainly HCl and HF) in exhaust gas. . The flow of the conventional wet flue gas desulfurization apparatus is shown in FIG. The exhaust gas 2 from the boiler 1 is usually introduced into the absorption tower 5 after the dust in the exhaust gas is removed by the dry dust collector 3. In the absorption tower 5, the absorbent slurry is circulated and sprayed through the circulation line 4 to remove the sulfur oxides (SO 2 etc.) in the exhaust gas and the dust and halogen compounds which cannot be completely removed by the dry dust collector 3. Part of the absorbent slurry that has absorbed sulfur oxides and the like is sent to the thickener 7, and the concentrated slurry is dehydrated by the gypsum dehydrator 8 and the reaction product gypsum 9 is recovered. In the absorption tower 5, the exhaust gas is cooled by the circulating absorbent slurry, so that the water in the absorbent slurry evaporates. Therefore, in order to make up for evaporated water, industrial water and thickener supernatant water pass through line 10 and absorption tower return line 1
1 is supplied to the absorption tower 5.
【０００３】吸収除去されたハロゲン化合物（主に塩化
物）は溶解度が高いため、吸収塔循環系内で濃縮され、
吸収塔５での脱硫性能の低下あるいは吸収塔循環系を構
成する装置のステンレス系材料の腐食の原因となる。こ
れを防ぐためにはシックナ７の上澄水の一部を排水ライ
ン１２より排水処理設備１７を経て吸収塔循環系外に排
出して、該系内の塩素濃度が一定の値以下となるように
する。排水は塩素の他に、同様に除去されてフッ素およ
び前記系内で副生されたＣＯＤ起因物質を含むため、そ
のまま系外に排出することはできず、特別な排水処理設
備１７が必要となる。Since halogen compounds (mainly chlorides) that have been absorbed and removed have high solubility, they are concentrated in the absorption tower circulation system,
This may cause a decrease in desulfurization performance in the absorption tower 5 or corrosion of the stainless steel material of the apparatus constituting the absorption tower circulation system. In order to prevent this, a part of the supernatant water of the thickener 7 is discharged from the drainage line 12 to the outside of the absorption tower circulation system through the drainage treatment facility 17 so that the chlorine concentration in the system becomes a certain value or less. . In addition to chlorine, the wastewater also contains fluorine and COD-derived substances by-produced in the system, which cannot be discharged as it is, and a special wastewater treatment facility 17 is required. .
【０００４】この排水処理設備１７のフローは通常、排
水中の固形物が除去されるＳＳ除去工程、アルカリ（Ｃ
ａ塩、Ｎａ塩）などの薬品をライン１８から添加し、溶
解金属およびフッ素化合物が除去される凝集沈殿工程、
その後ＣＯＤ起因物質（Ｓ2Ｏ6 2-）などがイオン吸着樹
脂などで除去されるＣＯＤ除去工程より構成され、処理
された排水は放流ライン１９より放流される。しかし、
この排水処理設備１７は非常に複雑なものであり設備
費、運転費とも多大なものとなっている。The flow of the wastewater treatment facility 17 is usually an SS (removal) step for removing solid matter in wastewater, alkali (C
Aggregation and precipitation step in which chemicals such as a salt and Na salt) are added from the line 18 to remove dissolved metals and fluorine compounds.
After that, the COD-causing substance (S 2 O 6 2− ) or the like is formed by a COD removing step in which the ion-adsorbing resin is removed, and the treated wastewater is discharged from the discharge line 19. But,
This wastewater treatment facility 17 is extremely complicated and requires a large amount of equipment cost and operating cost.
【０００５】上記の排水処理設備１７を縮小あるいは省
略するための技術として、排ガスの熱を利用して排水を
蒸発させる方式が容易に考えられ、具体的な手段とし、
排ガス煙道に排水を微細化して吹き込み直線ダクト部で
完全に乾燥させる方法、スプレドライヤを設置して排ガ
スにより排水を乾燥させる方法などがあるが、いずれも
乾燥時間が数秒間必要である（特開昭５７−１３６９２
１号、特開昭６０−４１５２９号、特開昭６０−２２２
１３５号、特開昭６０−２３８１２１号、特開昭６３−
２００８１８号、特開平１−９４９２１号、特開平１−
９４９２２号、特開平１−９４９２３号、特公昭６３−
５２９５３号等）。As a technique for reducing or omitting the waste water treatment facility 17 described above, a method of utilizing the heat of exhaust gas to evaporate waste water is easily conceivable.
There are various methods such as a method of atomizing wastewater into an exhaust gas flue and blowing it in a straight duct to dry it completely, a method of installing a spray dryer to dry the wastewater with exhaust gas. Kaisho 57-13692
1, JP-A-60-41529, and JP-A-60-222.
135, JP-A-60-238121, JP-A-63-
200818, JP-A-1-94921, JP-A-1-
94922, JP-A-1-94923, JP-B-63-
52953).
【０００６】[0006]
【発明が解決しようとする課題】上記従来技術は、排ガ
ス中に排水を噴霧した場合、完全に蒸発するまで数秒間
必要であるため、蒸発装置の規模が大きくなり、現実性
がなくなる。また噴霧された排水中の不純物（主にＣａ
Ｃｌ2、ばい塵）が蒸発装置内で堆積し、連続処理が不
可能になる問題があった。本発明の目的は排水処理設備
を縮小あるいは省略するための技術として、排ガスの熱
を利用して排水を蒸発させる方式を改良して蒸発装置の
規模を小さくし、さらに連続処理が可能な方式を提供す
ることである。In the above-mentioned prior art, when the waste water is sprayed into the exhaust gas, it takes several seconds until the waste water is completely evaporated. Therefore, the scale of the evaporation device becomes large and it becomes unrealistic. Impurities in the sprayed wastewater (mainly Ca
Cl 2 and dust) are accumulated in the evaporator, which makes continuous processing impossible. The object of the present invention is to improve the method of evaporating wastewater by utilizing the heat of exhaust gas as a technology for reducing or omitting wastewater treatment equipment, to reduce the scale of the evaporation device, and to provide a method capable of continuous treatment. Is to provide.
【０００７】[0007]
【課題を解決するための手段】本発明の上記目的は、次
の構成によって達成される。すなわち、燃焼排ガスを吸
収塔内に導き、吸収塔内に噴霧される吸収剤スラリと接
触させて排ガス中の硫黄酸化物を除去する湿式排煙脱硫
方法において、吸収塔から排出される脱硫水を吸収塔入
口前の排ガスダクト内上部より噴霧し、蒸発により濃縮
した脱硫排水を前記排ガスダクト底部の液溜めに受け
て、系外へ抜き出す湿式排煙脱硫方法、または、燃焼排
ガスを吸収塔内に導き、吸収塔内に噴霧される吸収剤ス
ラリと接触させて排ガス中の硫黄酸化物を除去する湿式
排煙脱硫装置において、吸収塔から排出される脱硫水を
噴霧する噴霧部をダクト内上部に備え、蒸発により濃縮
した脱硫排水を溜める液溜めを前記ダクト底部に備え、
濃縮された脱硫排水を液溜めから系外へ抜き出す脱硫排
水抜出部を備えた排水濃縮装置を吸収塔入口前の排ガス
ダクトに設けた湿式排煙脱硫装置である。ここで、排水
濃縮装置の脱硫排水噴霧部の後流側に排ガス流路を変え
る仕切板を入れることができる。The above object of the present invention can be achieved by the following constitutions. That is, in the wet flue gas desulfurization method of introducing the combustion exhaust gas into the absorption tower and contacting with the absorbent slurry sprayed in the absorption tower to remove the sulfur oxides in the exhaust gas, the desulfurized water discharged from the absorption tower is Wet flue gas desulfurization method of spraying from the upper part of the exhaust gas duct in front of the absorption tower inlet and receiving the desulfurization wastewater concentrated by evaporation in the liquid reservoir at the bottom of the exhaust gas duct, or extracting it outside the system, or combustion exhaust gas into the absorption tower. In a wet flue gas desulfurization device that removes sulfur oxides in the exhaust gas by bringing it into contact with the absorbent slurry that is sprayed into the absorption tower, a spray part that sprays desulfurized water discharged from the absorption tower is located in the upper part of the duct. Provided with a liquid reservoir at the bottom of the duct for storing desulfurization wastewater concentrated by evaporation,
It is a wet flue gas desulfurization device in which a wastewater concentrating device having a desulfurization drainage extraction unit for extracting concentrated desulfurization wastewater from a liquid reservoir to the outside of the system is provided in an exhaust gas duct in front of an absorption tower inlet. Here, a partition plate that changes the exhaust gas flow path can be placed on the downstream side of the desulfurization drainage spray section of the wastewater concentrator.
【０００８】また、本発明の上記目的は次の構成によっ
ても達成される。すなわち、燃焼排ガスを吸収塔内に導
き、吸収塔内に噴霧される吸収剤スラリと接触させて排
ガス中の硫黄酸化物を除去する湿式排煙脱硫装置におい
て、吸収塔から排出される脱硫水を噴霧する噴霧部をダ
クト内上部に備え、蒸発により濃縮した脱硫排水を溜め
る液溜めを前記ダクト底部に備え、濃縮された脱硫排水
を液溜めから系外へ抜き出す脱硫排水抜出部を備えた排
水濃縮装置を吸収塔入口前の排ガスダクトに設け、さら
に、排水濃縮装置の下流側に排水濃縮装置からの濃縮排
水と吸収塔から排出される脱硫水を導き、前記ダクト上
部のダクト噴霧部に噴霧する排水の濃縮度合を高めるた
めの循環タンクを設けた湿式排煙脱硫装置である。The above object of the present invention can also be achieved by the following configuration. That is, in the wet flue gas desulfurization device that guides the combustion exhaust gas into the absorption tower and removes the sulfur oxides in the exhaust gas by contacting it with the absorbent slurry sprayed in the absorption tower, the desulfurized water discharged from the absorption tower is Effluent with a desulfurization effluent outlet for ejecting concentrated desulfurization effluent from the reservoir to the outside of the system by equipping the duct with a spraying part for spraying A concentration device is installed in the exhaust gas duct in front of the inlet of the absorption tower, and further, concentrated wastewater from the wastewater concentration device and desulfurized water discharged from the absorption tower are introduced to the downstream side of the wastewater concentration device, and sprayed on the duct spraying part above the duct. It is a wet flue gas desulfurization device provided with a circulation tank for increasing the degree of concentration of waste water.
【０００９】上記いずれの湿式排煙脱硫装置において
も、排水濃縮装置または循環タンクにｐＨ調節剤（塩酸
等）を供給することで壁面にスケールが付着することを
防止できる。また、吸収塔の前流側の燃焼排ガス路に除
じん塔が設置されている場合、除じん塔の前流に排水濃
縮装置を設置することが望ましい。In any of the above wet flue gas desulfurization apparatus, it is possible to prevent the scale from adhering to the wall surface by supplying the pH adjusting agent (hydrochloric acid or the like) to the waste water concentrating apparatus or the circulation tank. Further, when the dust removal tower is installed in the combustion exhaust gas passage on the upstream side of the absorption tower, it is desirable to install the waste water concentrator in the upstream side of the dust removal tower.
【００１０】[0010]
【作用】本発明は湿式排煙脱硫処理により生じた排水を
完全に蒸発させるのではなく、排ガスの熱を利用して排
水を濃縮することにある。吸収塔入口前の排ガス温度は
通常９０〜１００℃であり、この排ガス中に排水を微細
化して噴霧することにより、排水中の水分を一部蒸発し
て排水を濃縮する。そのため、特に排水濃縮装置の容量
を大きくする必要はない。また、排水を濃縮することが
目的であるため、排水中の不純物が乾燥固形物として排
ガスダクト内に堆積することもなく安定した運転が連続
的に行える。According to the present invention, the wastewater produced by the wet flue gas desulfurization treatment is not completely evaporated, but the heat of the exhaust gas is used to concentrate the wastewater. The exhaust gas temperature before the inlet of the absorption tower is usually 90 to 100 ° C., and the waste water is atomized and sprayed in this exhaust gas to partially evaporate the water in the waste water to concentrate the waste water. Therefore, it is not necessary to increase the capacity of the waste water concentrator. Further, since the purpose is to concentrate the wastewater, stable operation can be continuously performed without impurities in the wastewater being accumulated as a dry solid in the exhaust gas duct.
【００１１】なお、排ガス流れにより排水の一部が吸収
塔に流入するのを防ぐため、排水濃縮装置の脱硫排水噴
霧部の後流側に設けられた仕切板により、排水噴霧部の
排ガス流れ方向を下方にし、排水濃縮装置の液溜めの液
面上でＵターンさせることにより、排ガスに同伴してい
る微細な液滴を慣性力で液面に衝突させている。In order to prevent a part of the wastewater from flowing into the absorption tower due to the exhaust gas flow, a partition plate provided on the downstream side of the desulfurization wastewater spraying section of the wastewater concentrating device is used to control the exhaust gas flow direction of the wastewater spraying section. Is turned downward and the U-turn is made on the liquid surface of the liquid sump of the waste water concentrator so that the fine liquid droplets entrained in the exhaust gas collide with the liquid surface by inertial force.
【００１２】また、排水の濃縮度合を増やすために排水
濃縮装置の下流に排水循環タンクを設けて脱硫反応後の
吸収剤スラリの脱水処理した上澄水と排水濃縮装置の液
溜めからの濃縮排水とを導入し、その一部を排水濃縮装
置の脱硫排水噴霧部に循環させて排水噴霧量を増加させ
ることで、排水中の水分の蒸発量が増えて、排水の濃縮
割合をさらに増加できる。Further, in order to increase the degree of concentration of waste water, a waste water circulation tank is provided downstream of the waste water concentrator, and the supernatant water obtained by dehydrating the absorbent slurry after the desulfurization reaction and the concentrated waste water from the sump of the waste water concentrator are used. Is introduced and a part thereof is circulated to the desulfurization drainage spray section of the drainage concentrator to increase the drainage spray amount, whereby the evaporation amount of water in the drainage is increased, and the concentration ratio of the drainage can be further increased.
【００１３】またシックナ上澄水は石膏が飽和状態にな
っているので、排水を濃縮する場合に石膏が析出してダ
クト内にスケールが生成する可能性があるため、前記排
水循環タンクのｐＨを下げて石膏の溶解度を高めること
により、ダクト内のスケール生成を抑制できる。なお、
湿式排煙脱硫装置に除じん塔が設置されている場合に
は、除じん塔前に排水濃縮装置を設置することにより有
効に排水を濃縮できる。In the thickener supernatant water, since the gypsum is saturated, when the wastewater is concentrated, there is a possibility that the gypsum may precipitate and scale may be generated in the duct. Therefore, the pH of the wastewater circulation tank is lowered. By increasing the solubility of gypsum, the scale formation in the duct can be suppressed. In addition,
When a dust removal tower is installed in the wet flue gas desulfurization equipment, the wastewater can be effectively concentrated by installing a wastewater concentrator in front of the dust removal tower.
【００１４】[0014]
【実施例】本発明の一実施例を図面とともに説明する。 実施例１ 図１に示す実施例では、図４に示した従来技術の湿式排
煙脱硫装置のフローと同一の装置は同一符号を用いてい
る。図１に示す本実施例のフローでは排水濃縮装置１３
を吸収塔５の排ガス入口部に設け、シックナ７の上澄水
の一部は脱硫排水ライン１２により排水濃縮装置１３へ
送られることが図４に示す従来技術のフローとは異な
る。An embodiment of the present invention will be described with reference to the drawings. Example 1 In the example shown in FIG. 1, the same apparatus as the flow of the conventional wet flue gas desulfurization apparatus shown in FIG. In the flow of this embodiment shown in FIG.
Is provided at the exhaust gas inlet of the absorption tower 5, and part of the supernatant water of the thickener 7 is sent to the wastewater concentrator 13 by the desulfurization drainage line 12, which is different from the flow of the conventional technique shown in FIG.
【００１５】排水濃縮装置１３でダクト上部の排水噴霧
部１４より、脱硫排水ライン１２からの脱硫排水が噴霧
され、排ガスの熱により脱硫排水の一部が蒸発し、濃縮
されて底部の液溜め１６に落下する。液溜め１６の濃縮
排水はダクト外へ抜き出され、排水処理設備１７へ送ら
れ、処理される。また、排水の液溜め１６の一部が排ガ
スに同伴して吸収塔５へ流入するのを防ぐため、排水濃
縮装置１３のダクト上部に仕切板１５を設置し、排水噴
霧部１４の排ガス流れ方向を下降流にし、液溜め１６の
液面上でＵターンさせて排ガスに同伴していた液滴を慣
性力により液面に衝突させて排ガスと液滴を分離し、排
ガスに同伴していた排水の液滴が吸収塔５内に流入する
のを防いでいる。また、排水を濃縮する場合に石膏が析
出してダクト内にスケールが生成する可能性がある場合
には、塩酸を排水濃縮装置１３に添加してｐＨを下げて
石膏の溶解度を高めることを行うこともできる。In the waste water concentrating device 13, the desulfurization waste water from the desulfurization waste water line 12 is sprayed from the waste water spraying part 14 at the upper part of the duct, and a part of the desulfurization waste water is evaporated by the heat of the exhaust gas to be condensed and the liquid sump 16 at the bottom part. To fall. The concentrated waste water of the liquid reservoir 16 is extracted outside the duct and sent to the waste water treatment facility 17 for treatment. Moreover, in order to prevent a part of the liquid sump 16 of the wastewater from flowing into the absorption tower 5 along with the exhaust gas, a partition plate 15 is installed above the duct of the wastewater concentrating device 13, and the exhaust gas flow direction of the wastewater spraying unit 14 is measured. To make a U-turn on the liquid surface of the liquid reservoir 16 so that the liquid droplets entrained in the exhaust gas collide with the liquid surface by inertial force to separate the exhaust gas and the liquid droplets, and the wastewater entrained in the exhaust gas This prevents the liquid droplets from flowing into the absorption tower 5. Further, when there is a possibility that gypsum may be deposited and scale may be generated in the duct when the wastewater is concentrated, hydrochloric acid is added to the wastewater concentrator 13 to lower the pH and increase the solubility of the gypsum. You can also
【００１６】本実施例は排ガスの熱を利用して排水を濃
縮することが目的であるが、排ガスへの水分蒸発量は飽
和まで蒸発させた場合１０００ＭＷ石炭焚発電所ボイラ
からの排ガスでは約９０ｔ／ｈの水が蒸発され、一方こ
の時の排水量は１０〜４０ｔ／ｈであるため、排水の全
量を蒸発させることが可能である。The purpose of this embodiment is to concentrate the waste water by utilizing the heat of the exhaust gas. However, when the amount of water vaporized into the exhaust gas is evaporated to the saturation, the exhaust gas from the 1000 MW coal-fired power plant boiler is about 90 t. / H of water is evaporated, while the amount of drainage at this time is 10 to 40 t / h, it is possible to vaporize the entire amount of drainage.
【００１７】（実験）本実施例の効果を確認するため、
２５００Ｎｍ3／ｈのパイロットプラントで試験を行っ
た。試験条件は、 １）排ガス量 ２５００Ｎｍ3／ｈ ２）水分 ７％ ３）濃縮装置入口ガス温度 ９２℃ ４）排水量 １０ｋｇ／ｈ である。(Experiment) In order to confirm the effect of this embodiment,
The test was conducted in a 2500 Nm 3 / h pilot plant. The test conditions are as follows: 1) Exhaust gas amount 2500 Nm 3 / h 2) Water content 7% 3) Concentrator inlet gas temperature 92 ° C. 4) Waste water amount 10 kg / h.
【００１８】排水濃縮装置１３では噴霧される排水液滴
径が排水濃縮に及ぼす影響を確認するため、微細な液滴
が発生できる２流体ノズルと、比較的液滴径の大きいフ
ルコーンノズルを使用した。試験結果を図２に示す。噴
霧排水を微細化すれば、排水を濃縮できることが確認さ
れた。なお、排水が全量乾燥された場合には排水中の不
純物がダクト内に堆積していた。In the wastewater concentrating device 13, in order to confirm the influence of the sprayed wastewater droplet size on the wastewater concentration, a two-fluid nozzle capable of generating fine droplets and a full cone nozzle having a relatively large droplet diameter are used. did. The test results are shown in FIG. It was confirmed that the wastewater can be concentrated if the spray wastewater is miniaturized. In addition, when the wastewater was completely dried, impurities in the wastewater were accumulated in the duct.
【００１９】実施例２ 本発明の他の実施例を図３に示す。本実施例は図１に示
す実施例１のフローとは次の点で異なる。すなわち、排
水の濃縮度合を増やすために排水濃縮装置１３の下に排
水循環タンク２１を設置し、この排水循環タンク２１に
シックナ７からの上澄水と排水濃縮装置１３の液溜め１
６からの濃縮排水とを導入し、その一部を排水濃縮装置
１３の排水噴霧部１４に循環させて排水噴霧量を増加さ
せていることである。これにより、排水中の水分の蒸発
量が増えて、排水の濃縮割合をさらに増加できる。Embodiment 2 Another embodiment of the present invention is shown in FIG. This embodiment differs from the flow of the first embodiment shown in FIG. 1 in the following points. That is, in order to increase the degree of concentration of wastewater, a wastewater circulation tank 21 is installed under the wastewater concentration device 13, and the supernatant water from the thickener 7 and the sump 1 of the wastewater concentration device 13 are installed in the wastewater circulation tank 21.
That is, the concentrated waste water from No. 6 is introduced, and a part of the concentrated waste water is circulated to the waste water spray unit 14 of the waste water concentrator 13 to increase the amount of waste water spray. As a result, the amount of water evaporated in the wastewater increases, and the concentration ratio of the wastewater can be further increased.
【００２０】またシックナ上澄水は石膏が飽和状態にな
っているので、排水を濃縮する場合に石膏が析出してダ
クト内にスケールが生成する可能性があるため、塩酸２
２を排水循環タンク２１に添加してｐＨを下げて石膏の
溶解度を高めることにより、ダクト内のスケール生成を
抑制できる。なお、湿式排煙脱硫装置に除じん塔が設置
されている場合には、除じん塔前に排水濃縮装置１３を
設置することにより有効に排水を濃縮できる。In the thickener supernatant water, the gypsum is in a saturated state. Therefore, when the wastewater is concentrated, the gypsum may precipitate and scale may be generated in the duct.
By adding 2 to the drainage circulation tank 21 to lower the pH and increase the solubility of gypsum, scale formation in the duct can be suppressed. When the dust removal tower is installed in the wet flue gas desulfurization apparatus, the waste water can be effectively concentrated by installing the waste water concentration device 13 in front of the dust removal tower.
【００２１】[0021]
【発明の効果】本発明によれば排水量を低減できるの
で、排水処理設備の規模を縮小でき、設備費、運転費を
低減できる効果がある。According to the present invention, since the amount of waste water can be reduced, there is an effect that the scale of waste water treatment equipment can be reduced and equipment cost and operation cost can be reduced.
【図１】 本発明の実施例１になる排水量を低減した湿
式排煙脱硫装置のフローを示す図である。FIG. 1 is a diagram showing a flow of a wet flue gas desulfurization apparatus having a reduced amount of waste water according to a first embodiment of the present invention.
【図２】 実施例１の効果を確認する試験結果を示す図
である。FIG. 2 is a diagram showing test results for confirming the effects of Example 1.
【図３】 本発明の実施例２になる排水量を低減した湿
式排煙脱硫装置のフローを示す図である。FIG. 3 is a diagram showing a flow of a wet flue gas desulfurization apparatus having a reduced amount of waste water according to a second embodiment of the present invention.
【図４】 従来の湿式排煙脱硫装置のフローを示す図で
ある。FIG. 4 is a diagram showing a flow of a conventional wet flue gas desulfurization apparatus.
１…ボイラ、３…乾式集塵機、５…吸収塔、７…シック
ナ、８…石膏脱水機、１０…シックナ上澄水ライン、１
２…脱硫排水ライン、１３…排水濃縮装置、１４…排水
噴霧部、１５…仕切板、１６…液溜め、１７…排水処理
設備、２１…排水循環タンク、２２…塩酸1 ... Boiler, 3 ... Dry dust collector, 5 ... Absorption tower, 7 ... Thickener, 8 ... Gypsum dehydrator, 10 ... Thickener clear water line, 1
2 ... Desulfurization drainage line, 13 ... Wastewater concentrator, 14 ... Wastewater spraying part, 15 ... Partition plate, 16 ... Liquid reservoir, 17 ... Wastewater treatment facility, 21 ... Wastewater circulation tank, 22 ... Hydrochloric acid
Claims (6)
に噴霧される吸収剤スラリと接触させて排ガス中の硫黄
酸化物を除去する湿式排煙脱硫方法において、吸収塔か
ら排出される脱硫水を吸収塔入口前の排ガスダクト内上
部より噴霧し、蒸発により濃縮した脱硫排水を前記排ガ
スダクト底部の液溜めに受けて、系外へ抜き出すことを
特徴とする湿式排煙脱硫方法。1. A wet flue gas desulfurization method in which combustion exhaust gas is introduced into an absorption tower and is brought into contact with an absorbent slurry sprayed in the absorption tower to remove sulfur oxides in the exhaust gas, and the exhaust gas is discharged from the absorption tower. A wet flue gas desulfurization method, characterized in that desulfurization water is sprayed from an upper part of an exhaust gas duct in front of an inlet of an absorption tower, desulfurization wastewater concentrated by evaporation is received by a liquid reservoir at a bottom part of the exhaust gas duct, and extracted out of the system.
に噴霧される吸収剤スラリと接触させて排ガス中の硫黄
酸化物を除去する湿式排煙脱硫装置において、吸収塔か
ら排出される脱硫水を噴霧する噴霧部をダクト内上部に
備え、蒸発により濃縮した脱硫排水を溜める液溜めを前
記ダクト底部に備え、濃縮された脱硫排水を液溜めから
系外へ抜き出す脱硫排水抜出部を備えた排水濃縮装置を
吸収塔入口前の排ガスダクトに設けたことを特徴とする
湿式排煙脱硫装置。2. A wet flue gas desulfurization device for introducing combustion exhaust gas into an absorption tower and contacting it with an absorbent slurry that is sprayed into the absorption tower to remove sulfur oxides in the exhaust gas, and is discharged from the absorption tower. A spray part for spraying desulfurized water is provided in the upper part of the duct, a liquid reservoir for storing desulfurized waste water concentrated by evaporation is provided in the bottom part of the duct, and a desulfurized waste water discharge part for extracting concentrated desulfurized waste water from the liquid reservoir to the outside of the system is provided. A wet flue gas desulfurization device, characterized in that the provided wastewater concentrating device is provided in the exhaust gas duct in front of the inlet of the absorption tower.
に排ガス流路を変える仕切板を入れたことを特徴とする
請求項２記載の湿式排煙脱硫装置。3. The wet flue gas desulfurization apparatus according to claim 2, wherein a partition plate for changing a flow path of the exhaust gas is inserted on the downstream side of the desulfurization waste water spray section of the waste water concentrator.
に噴霧される吸収剤スラリと接触させて排ガス中の硫黄
酸化物を除去する湿式排煙脱硫装置において、吸収塔か
ら排出される脱硫水を噴霧する噴霧部をダクト内上部に
備え、蒸発により濃縮した脱硫排水を溜める液溜めを前
記ダクト底部に備え、濃縮された脱硫排水を液溜めから
系外へ抜き出す脱硫排水抜出部を備えた排水濃縮装置を
吸収塔入口前の排ガスダクトに設け、さらに、排水濃縮
装置の下流側に排水濃縮装置からの濃縮排水と吸収塔か
ら排出される脱硫水を導き、前記ダクト上部のダクト噴
霧部に噴霧する排水の濃縮度合を高めるための循環タン
クを設けたことを特徴とする湿式排煙脱硫装置。4. A wet flue gas desulfurization apparatus for introducing combustion exhaust gas into an absorption tower and contacting with an absorbent slurry that is sprayed into the absorption tower to remove sulfur oxides in the exhaust gas, and discharged from the absorption tower. A spray part for spraying desulfurized water is provided in the upper part of the duct, a liquid reservoir for storing desulfurized waste water concentrated by evaporation is provided in the bottom part of the duct, and a desulfurized waste water discharge part for extracting concentrated desulfurized waste water from the liquid reservoir to the outside of the system is provided. The provided wastewater concentrator is installed in the exhaust gas duct in front of the inlet of the absorption tower, and further, the concentrated wastewater from the wastewater concentrator and the desulfurized water discharged from the absorption tower are introduced to the downstream side of the wastewater concentrator, and the duct sprayed above the duct. A wet flue gas desulfurization device, characterized in that a circulation tank is provided for increasing the concentration of the waste water sprayed on the section.
節剤供給部を設けたことを特徴とする請求項２または４
記載の湿式排煙脱硫装置。5. The drainage concentrating device or the circulation tank is provided with a pH adjusting agent supply section.
The wet flue gas desulfurization apparatus described.
塔が設置されている場合、除じん塔の前流に排水濃縮装
置を設置することを特徴とする請求項２または４記載の
湿式排煙脱硫装置。6. The drainage concentrating device is installed in the upstream of the dust removal tower when the dust removal tower is installed in the combustion exhaust gas passage on the upstream side of the absorption tower. Wet flue gas desulfurization equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4301935A JPH06142448A (en) | 1992-11-12 | 1992-11-12 | Wet type stack gas desulfurizing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4301935A JPH06142448A (en) | 1992-11-12 | 1992-11-12 | Wet type stack gas desulfurizing method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06142448A true JPH06142448A (en) | 1994-05-24 |
Family
ID=17902883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4301935A Pending JPH06142448A (en) | 1992-11-12 | 1992-11-12 | Wet type stack gas desulfurizing method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06142448A (en) |
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| US9808738B2 (en) | 2007-03-13 | 2017-11-07 | Heartland Water Technology, Inc. | Compact wastewater concentrator using waste heat |
| US9926215B2 (en) | 2007-03-13 | 2018-03-27 | Heartland Technology Partners Llc | Compact wastewater concentrator and pollutant scrubber |
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| JP2013500853A (en) * | 2009-07-29 | 2013-01-10 | ハートランド テクノロジー パートナーズ リミティッド ライアビリティ カンパニー | Compact wastewater concentrator and pollutant scrubber |
| JP2016040037A (en) * | 2009-07-29 | 2016-03-24 | ハートランド テクノロジー パートナーズ リミティッド ライアビリティ カンパニーＨｅａｒｔｌａｎｄ Ｔｅｃｈｎｏｌｏｇｙ Ｐａｒｔｎｅｒｓ Ｌｌｃ | Compact wastewater concentrator and contaminated material scrubber |
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