JPH084711B2 - Wet flue gas desulfurization equipment - Google Patents
Wet flue gas desulfurization equipmentInfo
- Publication number
- JPH084711B2 JPH084711B2 JP61307068A JP30706886A JPH084711B2 JP H084711 B2 JPH084711 B2 JP H084711B2 JP 61307068 A JP61307068 A JP 61307068A JP 30706886 A JP30706886 A JP 30706886A JP H084711 B2 JPH084711 B2 JP H084711B2
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- flue gas
- desulfurization tower
- wet flue
- stirrer
- 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 - Lifetime
Links
- 238000006477 desulfuration reaction Methods 0.000 title claims description 46
- 230000023556 desulfurization Effects 0.000 title claims description 46
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 14
- 239000003546 flue gas Substances 0.000 title claims description 14
- 239000002002 slurry Substances 0.000 claims description 49
- 230000002745 absorbent Effects 0.000 claims description 17
- 239000002250 absorbent Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 description 16
- 239000006028 limestone Substances 0.000 description 16
- 239000010440 gypsum Substances 0.000 description 10
- 229910052602 gypsum Inorganic materials 0.000 description 10
- 238000004062 sedimentation Methods 0.000 description 6
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 3
- 235000010261 calcium sulphite Nutrition 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- -1 absorption Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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、湿式排煙脱硫装置に係り、特に、新たに追
加する吸収剤スラリを効率よく供給および分散させるこ
とができる湿式排煙脱硫装置に関する。Description: TECHNICAL FIELD The present invention relates to a wet flue gas desulfurization apparatus, and more particularly to a wet flue gas desulfurization apparatus capable of efficiently supplying and dispersing a newly added absorbent slurry. Regarding
（従来の技術） 現在実用化されている湿式排煙脱硫装置は、石灰石、
生石灰、消石灰のようなカルシウム系吸収剤を使用し、
副生品として石膏を回収するいわゆる石灰石・石膏法
（または石灰・石膏法）が主流である。第３図は石灰石
を吸収剤とし、副生品として石膏を回収する従来の一塔
型排煙脱硫装置を示したものである。ボイラ等の排ガス
１は脱硫塔２に導びかれ、ここで循環液（吸収剤）スラ
リと接触し、冷却、除じん、脱硫され、デミスタ３でミ
ストを除去され、脱硫塔から排出される。一方、吸収剤
である石灰石スラリ20は、石灰石スラリポンプ21により
脱硫塔循環タンク４に供給され、そのスラリは、脱硫塔
循環ポンプ５により脱硫塔内へ設置されたスプレノズル
に供給され、ここから脱硫塔内に噴霧されて排ガスと接
触し、排ガス中の硫黄酸化物を吸収除去して第流塔循環
タンクへ戻り循環使用される。吸収剤スラリは脱硫塔内
を循環し硫黄酸化物を吸収除去することにより石膏（Ca
SO4・2H2O）および亜硫酸カルシウム（CaSO3・1/2H2O）
となる。亜硫酸カルシウムは脱硫塔循環タンク上部に設
けられた酸化用撹拌機11により微細化されてスラリ中に
注入される空気中の酸素によって酸化され石膏となる。
脱硫塔循環タンク内の石灰石スラリは、脱硫塔内で硫黄
酸化物を吸収し亜硫酸カルシウムおよび石膏になるた
め、消費量に見合う石灰石スラリが吸収される。(Prior Art) Wet flue gas desulfurization equipment currently in practical use is limestone,
Using calcium-based absorbents such as quicklime and slaked lime,
The so-called limestone-gypsum method (or lime-gypsum method) for recovering gypsum as a by-product is the mainstream. FIG. 3 shows a conventional one-column flue gas desulfurization apparatus that uses limestone as an absorbent and recovers gypsum as a by-product. Exhaust gas 1 from a boiler or the like is guided to a desulfurization tower 2, where it comes into contact with a circulating liquid (absorbent) slurry, is cooled, dust-removed, and desulfurized. Mist is removed by a demister 3 and discharged from the desulfurization tower. On the other hand, the limestone slurry 20 which is the absorbent is supplied to the desulfurization tower circulation tank 4 by the limestone slurry pump 21, and the slurry is supplied to the spray nozzle installed in the desulfurization tower by the desulfurization tower circulation pump 5 from which desulfurization is performed. It is sprayed into the tower and comes into contact with the exhaust gas, absorbs and removes the sulfur oxides in the exhaust gas, and returns to the circulation tank of the first flow tower for recycling. The absorbent slurry circulates in the desulfurization tower and absorbs and removes sulfur oxides.
SO 4・ 2H 2 O) and calcium sulfite (CaSO 3・ 1 / 2H 2 O)
Becomes Calcium sulfite is atomized by an agitator 11 for oxidation provided in the upper part of the desulfurization tower circulation tank and is oxidized by oxygen in the air injected into the slurry to become gypsum.
The limestone slurry in the desulfurization tower circulation tank absorbs the sulfur oxides into calcium sulfite and gypsum in the desulfurization tower, so that the limestone slurry suitable for consumption is absorbed.
脱硫塔循環タンク下部には撹拌機12が設けられ、タン
ク内を撹拌している。このような湿式排煙脱硫装置の性
能は、循環タンクに新たに供給される石灰石スラリとタ
ンク内貯留スラリとの混合度合いに大きく影響されるの
で、石灰石スラリを効率よく供給し、しかもタンク内貯
留スラリと効率よく混合することができる装置が切望さ
れている。A stirrer 12 is provided below the desulfurization tower circulation tank to stir the inside of the tank. The performance of such a wet flue gas desulfurization device is greatly affected by the degree of mixing of the limestone slurry newly supplied to the circulation tank and the storage slurry in the tank, so that the limestone slurry can be efficiently supplied and stored in the tank. A device that can efficiently mix with a slurry is desired.
（発明が解決しようとする問題点） 上記従来技術では、カルシウム系吸収剤スラリのタン
ク内均一分散をはかる目的で脱硫塔循環タンク上面から
吸収剤スラリを供給しているために、供給された吸収剤
スラリの混合、分散が十分ではなかった。(Problems to be Solved by the Invention) In the above-mentioned conventional technology, since the absorbent slurry is supplied from the upper surface of the desulfurization tower circulation tank for the purpose of uniformly dispersing the calcium-based absorbent slurry in the tank, Mixing and dispersion of the agent slurry was not sufficient.
本発明の目的は、上記した従来技術の欠点をなくし、
脱硫塔下部の循環タンクに供給されるカルシウム系吸収
剤スラリを効率よくタンク内に均一分散することができ
る湿式排煙脱硫装置を提供することにある。The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
It is an object of the present invention to provide a wet flue gas desulfurization device that can efficiently and uniformly disperse a calcium-based absorbent slurry supplied to a circulation tank below a desulfurization tower in the tank.
（問題点を解決するための手段） 要するに本発明は、排ガス中の硫黄酸化物をカルシウ
ム系吸収剤スラリと接触させて吸収除去する脱硫塔の下
部に、撹拌機を備えた循環タンクを有する湿式排煙脱硫
装置において、前記循環タンク内に設けられた撹拌機の
液吸い込み側の該撹拌機近傍に吸収剤スラリ供給管の開
口部を配置したことを特徴とする。(Means for Solving Problems) In short, the present invention is a wet type having a circulation tank equipped with a stirrer at the lower part of a desulfurization tower for absorbing and removing sulfur oxides in exhaust gas by contacting with a calcium-based absorbent slurry. In the flue gas desulfurization device, an opening of the absorbent slurry supply pipe is arranged near the stirrer on the liquid suction side of the stirrer provided in the circulation tank.
（作用） 本発明によれば、吸収剤スラリ供給管の開口部を循環
タンクに設けられた撹拌機の液吸い込み側の前記撹拌機
近傍に設けたことにより、カルシウム系吸収剤スラリは
前記撹拌機の液吸い込み側に設置された供給管の開口部
からタンク内に供給されるので、供給された前記スラリ
は撹拌機の羽根による剪断力を受けて分散混合度合いが
上昇する。また、撹拌機により生じる貯留スラリの噴流
中で旋回しつつ貯留スラリと混合されることにより、よ
り均一に拡散、混合する。カルシウム系吸収剤スラリの
液中への分散が促進されれば、貯留スラリのpHの回復が
促進され、硫黄酸化物の吸収能力が高まり、高効率の脱
硫装置となる。(Operation) According to the present invention, since the opening of the absorbent slurry supply pipe is provided near the agitator on the liquid suction side of the agitator provided in the circulation tank, the calcium-based absorbent slurry is agitated by the agitator. Since the slurry is supplied into the tank through the opening of the supply pipe installed on the liquid suction side, the supplied slurry is subjected to the shearing force of the blades of the stirrer to increase the degree of dispersion and mixing. In addition, while being swirled in the jet flow of the storage slurry generated by the agitator and being mixed with the storage slurry, it is more uniformly diffused and mixed. If the dispersion of the calcium-based absorbent slurry in the liquid is promoted, the recovery of the pH of the stored slurry is promoted, the ability to absorb sulfur oxides is increased, and the desulfurization device becomes highly efficient.
（実施例） 以下、本発明を図面に示す実施例により詳細に説明す
る。(Examples) Hereinafter, the present invention will be described in detail with reference to Examples shown in the drawings.
第１図は、本発明の代表的な湿式排煙脱硫装置の説明
図である。図において、脱硫塔への排ガス流入、硫黄酸
化物の除去、吸収、石膏生成および回収のシステムは第
３図の従来装置と同一であるため説明を省略する。従来
装置と異なる点は、脱硫塔下部循環タンク側壁に設けら
れた沈積防止用撹拌機12の背部、すなわち液吸い込み側
に石灰石スラリ20の供給管20Aの開口部を設けたことで
ある。FIG. 1 is an explanatory view of a typical wet flue gas desulfurization apparatus of the present invention. In the figure, the system of exhaust gas inflow into the desulfurization tower, removal of sulfur oxides, absorption, gypsum generation and recovery system is the same as that of the conventional apparatus in FIG. The difference from the conventional apparatus is that an opening of the supply pipe 20A of the limestone slurry 20 is provided on the back of the sedimentation preventing stirrer 12 provided on the side wall of the lower circulation tank of the desulfurization tower, that is, on the liquid suction side.
第１図において、従来は脱硫塔循環タンク４の液面上
から脱硫塔２内に供給されていた石灰石スラリ20は、脱
硫塔循環タンク下部に設けられた沈積防止用撹拌機12の
背部に設けられた供給管20Aの開口部からスラリ流の上
流側、すなわち撹拌機の液吸い込み側に供給される。In FIG. 1, the limestone slurry 20 that was conventionally supplied into the desulfurization tower 2 from above the liquid surface of the desulfurization tower circulation tank 4 is provided at the back of the sedimentation prevention agitator 12 provided in the lower part of the desulfurization tower circulation tank. The slurry is supplied from the opening of the supply pipe 20A to the upstream side of the slurry flow, that is, the liquid suction side of the stirrer.
石灰石スラリ20は、沈積防止用撹拌機によって生じる
噴流中で、循環タンクと混合されながら脱硫塔循環タン
ク下層において水平方向に循環するスラリ流中に均一拡
散する。The limestone slurry 20 is uniformly dispersed in the jet flow generated by the sedimentation agitator while being mixed with the circulation tank and horizontally circulated in the slurry flow in the lower layer of the desulfurization tower circulation tank.
第２図に、沈積防止用撹拌機により生ずるスラリ流れ
を示す。沈積防止用撹拌機12は、脱硫塔循環タンク側壁
の法線に対し約15゜の傾きを設けて取り付けられてい
る。タンク下部の水平面内にスラリ流を生じさせ、スラ
リ中の固形分がタンク底に沈積することを防止させるも
ので、上下の循環流の発生は少なく、脱硫塔循環タンク
上層部の低pHスラリ域を良好な状態に保持される。な
お、脱硫塔循環タンク内では、底部から脱硫塔循環ポン
プで保有スラリを抜き出して脱硫塔を循環させるため、
下向流が存在し、上層の低pH領域で酸化された保有スラ
リは下層へ移り、注入される石灰石スラリおよび未反応
石灰石スラリによりpHを回復する。FIG. 2 shows the slurry flow generated by the sedimentation agitator. The stirrer 12 for preventing sedimentation is installed with an inclination of about 15 ° with respect to the normal line of the side wall of the desulfurization tower circulation tank. A slurry flow is generated in the horizontal plane at the bottom of the tank to prevent solids in the slurry from depositing on the bottom of the tank.There is little circulation flow at the top and bottom, and a low pH slurry area in the upper layer of the desulfurization tower circulation tank. To be kept in good condition. In the desulfurization tower circulation tank, in order to circulate through the desulfurization tower by extracting the retained slurry with a desulfurization tower circulation pump from the bottom,
There is a downward flow, and the retained slurry that has been oxidized in the low pH region of the upper layer moves to the lower layer and the pH is restored by the injected limestone slurry and unreacted limestone slurry.
（発明の効果） 本発明によれば、循環タンク内に新たに供給されるカ
ルシウム系吸収剤スラリのタンク内液中への均一分散が
達成されるので、タンク内スラリのpH回復が促進し、脱
硫効率の高い湿式排煙脱硫装置となる。(Effect of the Invention) According to the present invention, since the calcium-based absorbent slurry newly supplied into the circulation tank is uniformly dispersed in the liquid in the tank, the pH recovery of the slurry in the tank is promoted, It becomes a wet flue gas desulfurization device with high desulfurization efficiency.
第１図は、本発明が適用される湿式排煙脱硫装置の説明
図、第２図は、脱硫塔循環タンク内下層の沈積防止用攪
拌機によるスラリ流線を表す図、第３図は、従来の湿式
排煙脱硫装置の説明図である。 １……排ガス、２……脱硫塔、３……デミスタ、４……
脱硫塔循環タンク、５……脱硫塔循環ポンプ、11……酸
化用撹拌機、12……沈積防止用撹拌機、13……ブリード
ポンプ、14……シックナ、15……石膏タンク、16……石
膏ポンプ、17……遠心分離機、18……石膏、19……濾過
水、20……石灰石スラリ、20A……石灰石スラリ供給
管、21……石灰石スラリポンプ。FIG. 1 is an explanatory view of a wet flue gas desulfurization apparatus to which the present invention is applied, FIG. 2 is a view showing a slurry flow line by a stirrer for preventing sedimentation of a lower layer in a desulfurization tower circulation tank, and FIG. It is an explanatory view of the wet flue gas desulfurization device. 1 ... Exhaust gas, 2 ... Desulfurization tower, 3 ... Demister, 4 ...
Desulfurization tower circulation tank, 5 ... Desulfurization tower circulation pump, 11 ... Oxidation stirrer, 12 ... Deposit prevention stirrer, 13 ... Bleed pump, 14 ... Thickener, 15 ... Gypsum tank, 16 ... Gypsum pump, 17 ... Centrifuge, 18 ... Gypsum, 19 ... Filtered water, 20 ... Limestone slurry, 20A ... Limestone slurry supply pipe, 21 ... Limestone slurry pump.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/34 ＺＡＢ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B01D 53/34 ZAB
Claims (1)
剤スラリと接触させて吸収除去する脱硫塔の下部に、撹
拌機を備えた循環タンクを有する湿式排煙脱硫装置にお
いて、前記循環タンク内に設けられた撹拌機の液吸い込
み側の該撹拌機近傍に吸収剤スラリ供給管の開口部を配
置したことを特徴とする湿式排煙脱硫装置。1. A wet flue gas desulfurization apparatus having a circulation tank equipped with a stirrer at a lower portion of a desulfurization tower for adsorbing and removing sulfur oxides in exhaust gas by contacting with a calcium-based absorbent slurry. A wet flue gas desulfurization apparatus characterized in that an opening of an absorbent slurry supply pipe is arranged near the stirrer on the liquid suction side of the stirrer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61307068A JPH084711B2 (en) | 1986-12-23 | 1986-12-23 | Wet flue gas desulfurization equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61307068A JPH084711B2 (en) | 1986-12-23 | 1986-12-23 | Wet flue gas desulfurization equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63158119A JPS63158119A (en) | 1988-07-01 |
| JPH084711B2 true JPH084711B2 (en) | 1996-01-24 |
Family
ID=17964658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61307068A Expired - Lifetime JPH084711B2 (en) | 1986-12-23 | 1986-12-23 | Wet flue gas desulfurization equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084711B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2774519B2 (en) * | 1988-09-06 | 1998-07-09 | バブコツク日立株式会社 | Wet exhaust gas desulfurization equipment |
| JP5785125B2 (en) | 2012-03-23 | 2015-09-24 | 株式会社マキタ | Power tools |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5891428U (en) * | 1981-12-15 | 1983-06-21 | 石川島播磨重工業株式会社 | Absorption tower of flue gas desulfurization equipment |
| JPS59230621A (en) * | 1983-06-14 | 1984-12-25 | Mitsubishi Heavy Ind Ltd | Absorbent supply method in exhaust gas treating apparatus |
| JPS61178021A (en) * | 1985-02-05 | 1986-08-09 | Mitsubishi Heavy Ind Ltd | Desulfurization of exhaust fume |
-
1986
- 1986-12-23 JP JP61307068A patent/JPH084711B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63158119A (en) | 1988-07-01 |
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