JP3002516B2 - Wet flue gas desulfurization method - Google Patents
Wet flue gas desulfurization methodInfo
- Publication number
- JP3002516B2 JP3002516B2 JP2264542A JP26454290A JP3002516B2 JP 3002516 B2 JP3002516 B2 JP 3002516B2 JP 2264542 A JP2264542 A JP 2264542A JP 26454290 A JP26454290 A JP 26454290A JP 3002516 B2 JP3002516 B2 JP 3002516B2
- Authority
- JP
- Japan
- Prior art keywords
- flue gas
- absorption tower
- absorbent slurry
- desulfurization method
- gas desulfurization
- 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.)
- Expired - Fee Related
Links
Landscapes
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は排煙脱硫処理方法に係り、特に排水を無くす
るに好適な排煙脱硫方法に関する。Description: TECHNICAL FIELD The present invention relates to a flue gas desulfurization treatment method, and more particularly to a flue gas desulfurization method suitable for eliminating wastewater.
［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−石膏排煙脱硫方法が広く実用化
されている。[Related Art] In order to prevent air pollution, as a method for removing sulfur oxides from exhaust gas, a wet limestone-gypsum flue gas desulfurization method has been widely put into practical use.
石炭焚きボイラ排ガスに適用される湿式排煙脱硫装置
は、硫黄酸化物・煤塵を除去するだけでなく、排ガス中
のハロゲンガスも吸収除去する。従来のボイラからの排
ガス処理設備を第３図に示す。ボイラ１からの排ガス
は、煙道13から通常は乾式集塵機２で排ガス中の煤塵が
除去された後、吸収塔３に導かれ、排ガス中のハロゲン
化合物と乾式集塵機２で除去しきれなかった煤塵を吸収
塔３で除去するとともに、ガス中の硫黄酸化物を吸収除
去する。A wet-type flue gas desulfurization device applied to coal-fired boiler exhaust gas not only removes sulfur oxides and dust, but also absorbs and removes halogen gas in the exhaust gas. FIG. 3 shows a conventional facility for treating exhaust gas from a boiler. Exhaust gas from the boiler 1 is passed from the flue 13 to the absorption tower 3 after the dust in the exhaust gas is usually removed by the dry dust collector 2 and then led to the absorption tower 3, and the dust that could not be removed by the dry dust collector 2 in the exhaust gas. Is removed by the absorption tower 3, and sulfur oxides in the gas are absorbed and removed.
吸収塔３で吸収剤スラリを循環ライン４を通して循環
スプレさせ、ハロゲン化合物を除去するとともにSO2等
の硫黄酸化物を除去する。The absorbent slurry is circulated and sprayed through the circulation line 4 in the absorption tower 3 to remove halogen compounds and sulfur oxides such as SO 2 .
SO2等を吸収した吸収剤スラリの一部は、シックナ５
へ送り、濃縮したスラリは脱水機６で脱水して、反応生
成物である石膏９を回収する。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
が蒸発し、これを補うため工業用水およびシックナ上澄
水７が吸収塔３へ供給される。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、系内で濃縮
し脱硫性能の低下、あるいはステンレス系材料の腐食を
起こすので、これを防ぐためシックナ５の上澄水７の一
部を排水ライン８より排水処理設備10を経て系外に排出
して、系内の塩素濃度が一定になるようにする。排水は
塩素の他に、同様に除去されたフッ素、または系内で副
生されたCOD起因物質を含むため、そのまま系外へ排出
することはできず、特別な排水処理設備10が必要とな
る。この排水処理設備10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（Ca塩、Na塩）等
の薬品11を添加し、溶解金属類およびフッ素化合物が除
去される凝集沈澱工程およびその後COD起因物質（S2O6
2-等）がイオン吸着樹脂等で除去されるCOD除去工程に
より構成され、非常に複雑なものであり、処理された排
水は放流ライン12より放流される。Part of the absorbent slurry that absorbed SO 2 etc.
The concentrated slurry is dehydrated by a dehydrator 6 to recover gypsum 9 as a reaction product. Since the exhaust gas is cooled by the circulating absorbent slurry, water in the absorbent slurry evaporates, and industrial water and thickener supernatant water 7 are supplied to the absorption tower 3 to make up for this. Since the halogen compounds (mainly chlorides) absorbed and removed have high solubility, they are concentrated in the system and reduce the desulfurization performance or cause corrosion of stainless steel materials. The part is discharged from the drainage line 8 to the outside of the system through the wastewater treatment facility 10 so that the chlorine concentration in the system becomes constant. Since wastewater contains chlorine, similarly removed fluorine, or COD-derived substances by-produced in the system, it cannot be discharged to the system as it is, requiring special wastewater treatment equipment 10 . The flow of the wastewater treatment equipment 10 is usually an SS removal step in which solids in the wastewater are removed, a chemical 11 such as an alkali (Ca salt, Na salt) is added, and coagulation in which dissolved metals and fluorine compounds are removed. Precipitation step and then COD-causing substances (S 2 O 6
2- etc.) is constituted by a COD removal process in which the wastewater is removed by an ion-adsorbing resin or the like, and is very complicated. The treated wastewater is discharged from a discharge line 12.
この排水処理設備を省略させる方法については、本発
明者は先に特許出願（特願平１−18264号）をした。こ
の発明は第３図の吸収塔３から抜き出した吸収剤スラリ
を乾式集塵機２の前流の煙道13へ噴霧装置24により噴霧
して吸収剤スラリを乾燥させ、固化物を乾式集塵機２に
より捕集するというものであった。The inventor of the present invention has previously filed a patent application (Japanese Patent Application No. 1-18264) for a method of omitting the wastewater treatment equipment. According to the present invention, the absorbent slurry extracted from the absorption tower 3 shown in FIG. 3 is sprayed by a spraying device 24 into a flue 13 upstream of the dry dust collector 2 to dry the absorbent slurry, and the solidified matter is captured by the dry dust collector 2. Was to gather.
［発明が解決しようとする課題］ 上記従来技術は排水の無水化には効果があるが、煙道
内に噴霧した吸収剤スラリが、煙道内に堆積する恐れが
あった。[Problems to be Solved by the Invention] Although the above-mentioned prior art is effective for dehydration of wastewater, there is a possibility that the absorbent slurry sprayed into the flue may accumulate in the flue.
そこで、本発明の目的は吸収剤スラリを煙道内に噴霧
することなく、吸収塔から抜き出した吸収剤スラリから
固形物を得て無排水化することにある。Accordingly, an object of the present invention is to obtain a solid from the absorbent slurry extracted from the absorption tower and to make it drain-free without spraying the absorbent slurry into the flue.
［課題を解決するための手段］ 本発明の上記目的はつぎの構成により達成される。[Means for Solving the Problems] The above object of the present invention is achieved by the following constitutions.
すなわち、燃焼排ガスを吸収塔に導き、吸収剤スラリ
により排ガス中の硫黄酸化物を吸収除去する湿式排煙脱
硫方法において、吸収塔より吸収剤スラリを一部抜き出
し、石炭灰、消石灰を添加し混合した後、加熱して無公
害な固形物を得る排煙脱硫方法、または、 燃焼排ガスを吸収塔に導き、吸収剤スラリにより排ガ
ス中の硫黄酸化物を吸収除去する湿式排煙脱硫方法にお
いて、吸収塔より吸収剤スラリを一部抜き出し、濃縮器
を通して濃縮し、その濃縮スラリに石炭灰、消石灰を添
加し混合した後、加熱して無公害な固化物を得る排煙脱
硫方法、 である。That is, in the wet flue gas desulfurization method in which the combustion exhaust gas is led to the absorption tower and the sulfur oxide in the exhaust gas is absorbed and removed by the absorbent slurry, a part of the absorbent slurry is extracted from the absorption tower, and coal ash and slaked lime are added and mixed. After that, in the flue gas desulfurization method of heating to obtain non-polluting solids, or in the wet flue gas desulfurization method of guiding the combustion exhaust gas to the absorption tower and absorbing and removing the sulfur oxides in the exhaust gas by the absorbent slurry A flue gas desulfurization method in which a part of the absorbent slurry is extracted from the tower, concentrated through a concentrator, coal ash and slaked lime are added to the concentrated slurry, mixed, and then heated to obtain a pollution-free solidified product.
［作用］ 吸収塔より吸収剤スラリの一部を抜き出すことによ
り、吸収塔内でのハロゲン化合物の濃縮を防ぎ、また抜
き出した吸収剤スラリは石炭灰、消石灰等を添加して加
熱することにより、吸収剤スラリ中に含まれていた塩素
化合物が添加した石炭灰、消石灰等と水和反応し、 β−3CaO・Al2O3・CaCl2・XH2Oのような水和物として安
定に固定される。そして、吸収剤スラリ中のCOD起因物
質やフッ素等はこの水和物中に取り込まれ無公害な固化
物となる。また、こうして煙道中に固形物が堆積するこ
ともなくなり、排水の無水化が達成される。[Action] By extracting a part of the absorbent slurry from the absorption tower, the concentration of the halogen compound in the absorption tower is prevented, and the extracted absorbent slurry is heated by adding coal ash, slaked lime, etc. Chlorine compounds contained in the absorbent slurry react with hydrated coal ash, slaked lime, etc., and are stably fixed as hydrates such as β-3CaO ・ Al 2 O 3・ CaCl 2・ XH 2 O Is done. Then, the COD-causing substances, fluorine, and the like in the absorbent slurry are taken into the hydrate and become a pollution-free solid. In addition, solid matter does not accumulate in the flue in this way, and dehydration of wastewater is achieved.
［実施例］ 本発明の一実施例を図面と共に説明する。Example An example of the present invention will be described with reference to the drawings.
第１図に示す実施例は第３図で述べた従来技術の排煙
脱硫装置と次の点で異なる。すなわち、吸収塔３から吸
収剤スラリを吸収剤スラリ抜き出しポンプ14により一部
抜き出し、吸収剤スラリ抜き出しライン15を経て混合装
置16に送液される。混合装置16では石炭灰17、消石灰18
が添加され混合される。吸収剤スラリと石炭灰17、消石
灰18の混合物は乾燥装置19に送られ、加熱され、固化物
20として排出される。なお、乾燥装置19の熱源として湿
式排煙吸収塔３入口の高温排ガスの一部をライン21によ
り乾燥装置19に導き、排ガスの顕熱を利用して加熱す
る。その後、排ガスはライン22により再び、湿式排煙吸
収塔３入口に戻す。The embodiment shown in FIG. 1 differs from the prior art flue gas desulfurization apparatus described in FIG. 3 in the following points. That is, the absorbent slurry is partly extracted from the absorption tower 3 by the absorbent slurry extraction pump 14 and sent to the mixing device 16 via the absorbent slurry extraction line 15. In the mixing device 16, coal ash 17, slaked lime 18
Is added and mixed. The mixture of the absorbent slurry, coal ash 17 and slaked lime 18 is sent to the drying device 19 where it is heated and solidified.
Emitted as 20. A part of the high-temperature exhaust gas at the entrance of the wet-type flue gas absorption tower 3 as a heat source of the drying device 19 is guided to the drying device 19 through the line 21 and is heated using sensible heat of the exhaust gas. Thereafter, the exhaust gas is returned to the inlet of the wet-type flue gas absorber 3 again through the line 22.
吸収塔３から抜き出す吸収剤スラリは、吸収塔３内の
塩素の濃縮を防ぐためのものであり、吸収塔３内の塩素
濃度が一定となるように抜き出し量を調節する。The absorbent slurry extracted from the absorption tower 3 is for preventing the concentration of chlorine in the absorption tower 3, and the extraction amount is adjusted so that the chlorine concentration in the absorption tower 3 becomes constant.
吸収塔３から抜き出した吸収剤スラリは混合装置16で
石炭灰17および消石灰18が添加され、これらを混合した
後、乾燥装置19において、吸収塔３入口排ガスの顕熱を
利用し、乾燥固化される。吸収剤スラリに石炭灰17およ
び消石灰18を添加することにより、吸収剤スラリ中の塩
素化合物と石膏、そして添加した石炭灰17と消石灰18が
水和反応により、 β−3OaO・Al2O3・CaCl2・XH2O等のような固化物を生じ
る。この固化物中に、吸収塔３内で発生したCOD起因物
質、フッ素化合物が取り込まれ、環境を汚染しない無害
な固形物となる。The absorbent slurry extracted from the absorption tower 3 is added with coal ash 17 and slaked lime 18 in a mixing device 16, and after mixing these, in a drying device 19, is dried and solidified using the sensible heat of the exhaust gas at the entrance of the absorption tower 3. You. By adding coal ash 17 and slaked lime 18 to the absorbent slurry, the chlorine compound and gypsum in the absorbent slurry, and the added coal ash 17 and slaked lime 18 by a hydration reaction, β-3OaOAl 2 O 3 This produces solids such as CaCl 2 .XH 2 O. Into the solidified matter, the COD-causing substance and the fluorine compound generated in the absorption tower 3 are taken into a solid substance that does not pollute the environment.
また、乾燥装置の加熱源として、ボイラ１からの蒸気
あるいは電気ヒータ等も使用することができる。In addition, steam from the boiler 1, an electric heater, or the like can be used as a heating source of the drying device.
また、第２図に本発明の他の実施例を示すが、吸収塔
３から抜き出した吸収剤スラリを濃縮装置23で濃縮した
後、石炭灰17、消石灰18を混合し、加熱して固化物を得
るものである、吸収剤スラリを濃縮装置23で濃縮するこ
とにより、該スラリ中の水分の濃縮の負担が小さくな
る。FIG. 2 shows another embodiment of the present invention. After the absorbent slurry extracted from the absorption tower 3 is concentrated by the concentration device 23, the coal ash 17 and the slaked lime 18 are mixed, and the mixture is heated and solidified. By concentrating the absorbent slurry with the concentrating device 23, the burden of concentrating water in the slurry is reduced.
［発明の効果］ 本発明によれば煙道内へ固化物が堆積することがな
く、吸収剤スラリ、石炭灰、消石灰の混合物を乾燥し、
固化物を得ることにより湿式排煙脱硫装置からの排水を
無くすることができる。[Effect of the Invention] According to the present invention, the solidified material is not deposited in the flue, and the mixture of the absorbent slurry, the coal ash, and the slaked lime is dried,
By obtaining the solidified product, wastewater from the wet flue gas desulfurization device can be eliminated.
【図面の簡単な説明】 第１図は本発明の実施例図、第２図は本発明の他の実施
例図、第３図は従来技術の説明図である。 １……ボイラ、２……乾式集塵機、３……吸収塔、４…
…循環ライン、５……シックナ、６……脱水機、７……
上澄水、８……排水ライン、９……石膏、10……排水処
理設備、11……薬品、12……放流ライン、13……ボイラ
出口煙道、14……吸収剤スラリ抜き出しポンプ、15……
吸収剤スラリ抜き出しライン、16……混合装置、17……
石炭灰、18……消石灰、19……乾燥装置、20……固形
物、21……排ガス導入ライン、22……排ガス戻りライ
ン、23……濃縮装置、24……噴霧装置BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a view showing another embodiment of the present invention, and FIG. 1 ... boiler, 2 ... dry dust collector, 3 ... absorption tower, 4 ...
... Circulation line, 5 ... Thickener, 6 ... Dehydrator, 7 ...
Supernatant water, 8 drainage line, 9 gypsum, 10 wastewater treatment facility, 11 chemicals, 12 discharge line, 13 boiler outlet flue, 14 pump for removing absorbent slurry, 15 ......
Absorbent slurry extraction line, 16 mixing device, 17
Coal ash, 18 ... Slaked lime, 19 ... Drying device, 20 ... Solid matter, 21 ... Exhaust gas introduction line, 22 ... Exhaust gas return line, 23 ... Concentrator, 24 ... Sprayer
フロントページの続き (56)参考文献 特開 昭55−97225（ＪＰ，Ａ) 特開 平２−198613（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 53/50,53/77 Continuation of the front page (56) References JP-A-55-97225 (JP, A) JP-A-2-198613 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B01D 53 / 50,53 / 77
Claims (4)
により排ガス中の硫黄酸化物を吸収除去する湿式排煙脱
硫方法において、 吸収塔より吸収剤スラリを一部抜き出し、石炭灰、消石
灰を添加し混合した後、加熱して無公害な固形物を得る
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 flue gas is guided to an absorption tower and sulfur oxides in the exhaust gas are absorbed and removed by the absorbent slurry, wherein a part of the absorbent slurry is extracted from the absorption tower to remove coal ash and slaked lime. A wet flue gas desulfurization method comprising adding, mixing, and heating to obtain a non-polluting solid.
らの蒸気、その他の外部熱源を使用することを特徴とす
る請求項１記載の湿式排煙脱硫方法。2. The wet flue gas desulfurization method according to claim 1, wherein sensible heat of exhaust gas, steam from a boiler, or another external heat source is used as a heating source.
により排ガス中の硫黄酸化物を吸収除去する湿式排煙脱
硫方法において、 吸収塔より吸収剤スラリを一部抜き出し、濃縮器を通し
て濃縮し、その濃縮スラリに石炭灰、消石灰を添加し混
合した後、加熱して無公害な固化物を得ることを特徴と
する湿式排煙脱硫方法。3. A wet flue gas desulfurization method for introducing flue gas to an absorption tower and absorbing and removing sulfur oxides in the exhaust gas by an absorbent slurry, wherein a part of the absorbent slurry is extracted from the absorption tower and concentrated through a concentrator. A wet flue gas desulfurization method characterized in that coal ash and slaked lime are added to the concentrated slurry, mixed and heated to obtain a pollution-free solidified product.
らの蒸気、その他の外部熱源を使用することに特徴とす
る請求項３記載の湿式排煙脱硫方法。4. The wet flue gas desulfurization method according to claim 3, wherein sensible heat of exhaust gas, steam from a boiler, or another external heat source is used as a heating source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2264542A JP3002516B2 (en) | 1990-10-02 | 1990-10-02 | Wet flue gas desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2264542A JP3002516B2 (en) | 1990-10-02 | 1990-10-02 | Wet flue gas desulfurization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04141216A JPH04141216A (en) | 1992-05-14 |
| JP3002516B2 true JP3002516B2 (en) | 2000-01-24 |
Family
ID=17404717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2264542A Expired - Fee Related JP3002516B2 (en) | 1990-10-02 | 1990-10-02 | Wet flue gas desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3002516B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005087897A (en) * | 2003-09-18 | 2005-04-07 | Aono Shokai:Kk | Combustion apparatus and removal method for harmful substance |
| CN108178362B (en) * | 2016-12-08 | 2024-03-15 | 中电华创电力技术研究有限公司 | Limestone-gypsum desulfurization wastewater zero-emission treatment method and system |
| JP7356251B2 (en) | 2019-04-01 | 2023-10-04 | 三菱重工業株式会社 | Apparatus and method related to gas purification treatment and/or combustion ash neutralization treatment |
| JP2021154245A (en) * | 2020-03-27 | 2021-10-07 | 三菱パワー株式会社 | Absorption liquid processing system for exhaust gas desulfurizer |
-
1990
- 1990-10-02 JP JP2264542A patent/JP3002516B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04141216A (en) | 1992-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2014115408A1 (en) | Exhaust gas processing system and exhaust gas processing method | |
| JPH119962A (en) | Waste gas treatment method and apparatus therefor | |
| JP3002516B2 (en) | Wet flue gas desulfurization method | |
| JP2740533B2 (en) | Wet exhaust gas desulfurization method | |
| JPS6363248B2 (en) | ||
| WO2001032324A1 (en) | Method for treating combustion ash of coal and method for desulfurization | |
| JPH10337432A (en) | Exhaust gas treatment and device therefor | |
| JP2805497B2 (en) | Treatment of wet flue gas desulfurization wastewater | |
| JP2886180B2 (en) | Wastewater treatment method for wet desulfurization equipment | |
| JPS5990617A (en) | Treatment of waste gas | |
| JP3526975B2 (en) | Coal ash solidification treatment method for desulfurization wastewater | |
| JP2805495B2 (en) | Thermal power plant system with wet flue gas treatment equipment | |
| JP3295935B2 (en) | Wet exhaust gas desulfurization equipment | |
| JP2940981B2 (en) | Wet exhaust gas desulfurization apparatus and wet exhaust gas desulfurization method | |
| JP4681259B2 (en) | Sludge treatment method and sludge treatment system | |
| JPH0521609B2 (en) | ||
| JPH01284381A (en) | Treatment of fly ash | |
| JPS61181519A (en) | Treatment of waste liquid in waste gas treating apparatus | |
| JPS60222135A (en) | Treatment of drainage | |
| JP3063123B2 (en) | Wastewater treatment method for wet flue gas desulfurization equipment | |
| JP3296843B2 (en) | Drying device and dry desulfurization device using steam type air heater | |
| JP3204694B2 (en) | Method for producing desulfurizing agent and desulfurizing method | |
| JPH11169638A (en) | Treatment of waste gas and device therefor | |
| JPH0549853A (en) | Method for stack gas desulfurization method and device therefor | |
| JPH0416209B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |