JP2001062245A - Method for replenishing absorbent in exhaust gas desulfurizing method - Google Patents
Method for replenishing absorbent in exhaust gas desulfurizing methodInfo
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- JP2001062245A JP2001062245A JP2000186303A JP2000186303A JP2001062245A JP 2001062245 A JP2001062245 A JP 2001062245A JP 2000186303 A JP2000186303 A JP 2000186303A JP 2000186303 A JP2000186303 A JP 2000186303A JP 2001062245 A JP2001062245 A JP 2001062245A
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- Prior art keywords
- magnesium
- magnesium hydroxide
- desulfurization
- replenishing
- desulfurizing
- 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]
【発明の属する技術分野】本発明は、排ガス中に含まれ
る硫黄酸化物をマグネシウム系化合物を脱硫剤として固
定除去する水酸化マグネシウム脱硫法において、使用さ
れるマグネシウム系化合物の補充方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replenishing magnesium compounds used in a magnesium hydroxide desulfurization method for fixing and removing sulfur oxides contained in exhaust gas using a magnesium compound as a desulfurizing agent.
【０００２】[0002]
【従来の技術】マグネシウム系化合物（水酸化マグネシ
ウム、酸化マグネシウム、炭酸マグネシウム、またはド
ロマイトなどを原料として得られる水酸化マグネシウム
など）と排気ガスを気液接触させて排気ガス中に含まれ
る硫黄酸化物を除去する脱硫工程と、脱硫工程液を酸化
させ含有する亜硫酸マグネシウム等を硫酸マグネシウム
に変換する酸化工程と、硫酸マグネシウムを塩基性カル
シウム化合物と複分解反応をさせ水酸化マグネシウムと
二水石膏とにする複分解工程からなり、複分解工程で得
られた水酸化マグネシウムと二水石膏を直接あるいは水
酸化マグネシウムと二水石膏をいったん貯蔵する貯蔵工
程を経て脱硫工程に送り、含有する水酸化マグネシウム
を再び脱硫剤として使用し、二水石膏を脱硫工程又は酸
化工程から除去する水酸化マグネシウム脱硫方法はよく
知られている。2. Description of the Related Art Sulfur oxides contained in exhaust gas by bringing a magnesium-based compound (such as magnesium hydroxide, magnesium oxide, magnesium carbonate, or magnesium hydroxide obtained from dolomite or the like) into exhaust gas and liquid contact. A desulfurization step of removing the sulfur, an oxidation step of oxidizing the desulfurization step liquid to convert magnesium sulfite and the like to magnesium sulfate, and performing a metathesis reaction of magnesium sulfate with a basic calcium compound to form magnesium hydroxide and gypsum. It consists of a metathesis process, and sends the magnesium hydroxide and dihydrate gypsum obtained in the metathesis process directly or to the desulfurization process via the storage process of temporarily storing magnesium hydroxide and gypsum, and recontains the magnesium hydroxide contained in the desulfurizing agent. Used to remove gypsum from desulfurization or oxidation process Magnesium desulfurization method hydroxide are well known.
【０００３】この水酸化マグネシウム脱硫方法では脱硫
剤として使用する水酸化マグネシウムは亜硫酸マグネシ
ウム、硫酸マグネシウム、再び水酸化マグネシウムとそ
の形態を変化させながら系内を循環する。しかしながら
排気ガス中の塵埃、塩素化合物等の蓄積を防ぐためブロ
ー水として一部排出する必要があり、このブロー水とと
ともに系内を循環しているマグネシウム化合物の一部が
排出され損失となる。In this magnesium hydroxide desulfurization method, magnesium hydroxide used as a desulfurizing agent circulates in the system while changing its form with magnesium sulfite, magnesium sulfate, and magnesium hydroxide again. However, in order to prevent the accumulation of dust, chlorine compounds, and the like in the exhaust gas, it is necessary to discharge a part of the magnesium compound circulating in the system together with the blow water, resulting in a loss.
【０００４】従来この損失となるマグネシウムを補充す
るために水酸化マグネシウムを３０−３５重量％のスラ
リーとして、図４に示すようにラインＬ１を経由して、
回収水酸化マグネシウム槽に供給している。一方系外に
排出されるブロー水中に含まれるマグネシウム化合物
は、その抜き出される場所によりその濃度形態を異にす
る。しかしいずれの場所から抜き出されてもその濃度は
補充される水酸化マグネシウムの濃度と比較して極めて
低い。そのため長期の運転により系内のマグネシウム／
水バランスが変化し、運転の継続を不可能とする。その
対策として回収水酸化マグネシウム槽を設けて一種のバ
ッファータンクとしてきたが、それでも回収水酸化マグ
ネシウム槽の水位の変化が極めて大きくなり安定した運
転が困難であった。[0004] Conventionally, to replenish the magnesium which causes the loss, magnesium hydroxide is prepared as a slurry of 30-35% by weight through a line L1 as shown in FIG.
The recovered magnesium hydroxide is supplied to the tank. On the other hand, the concentration of the magnesium compound contained in the blow water discharged out of the system differs depending on the place where the magnesium compound is extracted. However, no matter where it is extracted, its concentration is extremely low compared to the concentration of magnesium hydroxide to be replenished. Therefore, magnesium /
Water balance changes, making it impossible to continue operation. As a countermeasure, a recovery magnesium hydroxide tank was provided to serve as a kind of buffer tank. However, the water level of the recovery magnesium hydroxide tank was extremely changed, and stable operation was difficult.
【０００５】[0005]
【発明が解決しようとする課題】本願発明の目的は、上
記従来技術の問題点であるマグネシウム／水バランスを
一定に保つマグネシウム系化合物の補充方法を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for replenishing a magnesium compound which maintains the magnesium / water balance, which is a problem of the prior art.
【０００６】[0006]
【課題を解決するための手段】本発明は、 １．マグネシウム系化合物を吸収剤として排気ガスと気
液接触させて排気ガス中に含まれる硫黄酸化物を除去す
る脱硫工程と、脱硫工程液を酸素を含有するガスと接触
させる酸化工程と、酸化工程処理液を塩基性カルシウム
化合物と複分解反応をさせ水酸化マグネシウムと二水石
膏とにする複分解工程を含み、複分解工程で得られた水
酸化マグネシウムと二水石膏を直接または水酸化マグネ
シウムと二水石膏をいったん貯蔵する貯蔵工程を経て脱
硫工程及び／又は酸化工程に送り、含有する水酸化マグ
ネシウムを再び脱硫剤または中和剤として使用する脱硫
方法において、補充するマグネシウム系化合物を系内の
全マグネシウム／水のモル比に調整して系内に補充する
ことを特徴とする排煙脱硫方法における吸収剤の補充方
法 ２．前記複分解工程で得られた水酸化マグネシウムと二
水石膏を直接脱硫工程及び／又は酸化工程に送る脱硫方
法において、前記補充するマグネシウム系化合物を脱硫
工程及び／又は酸化工程に補充することを特徴とする上
記１に記載の吸収剤の補充方法 ３．前記複分解工程で得られた水酸化マグネシウムと二
水石膏をいったん貯蔵する貯蔵工程を経て脱硫工程及び
／又は酸化工程に送る脱硫方法において、前記補充する
マグネシウム系化合物を脱硫工程及び／又は酸化工程及
び／又は貯蔵工程に補充することを特徴とする上記１に
記載の吸収剤の補充方法および ４．前記貯蔵工程が系内のマグネシウム化合物を含む循
環液のバッファーとして機能する貯槽を含み、（１）該
貯槽の液面が規定のレベルより高い場合は、貯蔵工程よ
り水酸化マグネシウムを含むスラリーを脱硫工程及び／
又は酸化工程に供給して液面が規定のレベルより低下し
た時点で前記補充するマグネシウム化合物を脱硫工程及
び／又は酸化工程に補充し、（２）該貯槽の液面が規定
のレベルより低い場合は直ちに前記補充するマグネシウ
ム化合物を脱硫工程及び／又は酸化工程に補充すること
を特徴とする上記３に記載の吸収剤の補充方法である。The present invention provides: A desulfurization step of removing sulfur oxides contained in the exhaust gas by bringing the magnesium compound into gas-liquid contact with the exhaust gas as an absorbent, an oxidation step of bringing the desulfurization step liquid into contact with a gas containing oxygen, and an oxidation step treatment Including a metathesis step of performing a metathesis reaction of the solution with a basic calcium compound to make magnesium hydroxide and gypsum, the magnesium hydroxide and the gypsum obtained in the metathesis step are directly or magnesium hydroxide and gypsum. In the desulfurization method using the magnesium hydroxide as a desulfurizing agent or a neutralizing agent, the magnesium compound to be replenished is sent to a desulfurizing step and / or an oxidizing step through a storage step of temporarily storing the magnesium compound. 1. A method for replenishing an absorbent in a flue gas desulfurization method, which comprises adjusting the molar ratio to 1 and replenishing the system. In a desulfurization method in which magnesium hydroxide and gypsum obtained in the metathesis step are directly sent to a desulfurization step and / or an oxidation step, the replenishing magnesium-based compound is added to a desulfurization step and / or an oxidation step. 2. The method for replenishing the absorbent according to the above item 1, In a desulfurization method in which the magnesium hydroxide and dihydrate gypsum obtained in the metathesis step are temporarily stored and then sent to a desulfurization step and / or an oxidation step, the replenishing magnesium-based compound is desulfurized and / or oxidized. 3. The method for replenishing the absorbent according to the above item 1, wherein the method is replenished in a storage step. The storage step includes a storage tank functioning as a buffer for a circulating liquid containing a magnesium compound in the system. (1) When the liquid level of the storage tank is higher than a specified level, the storage step desulfurizes the slurry containing magnesium hydroxide. Process and / or
Alternatively, the magnesium compound to be replenished is replenished to the desulfurization step and / or the oxidation step when the liquid level falls below a prescribed level after being supplied to the oxidation step, and (2) when the liquid level in the storage tank is lower than the prescribed level 3. The method for replenishing an absorbent according to the above item 3, wherein the magnesium compound to be replenished is immediately replenished to a desulfurization step and / or an oxidation step.
【０００７】[0007]
【発明の実施の形態】以下、本発明を図を用いてさらに
詳細に説明する。図１は本発明の吸収剤としてのマグネ
シウム系化合物を補充する方法のうち、複分解反応を行
う複分解槽２で生成する水酸化マグネシウムと二水石膏
の混合スラリーをいったん貯蔵する貯蔵工程（回収水酸
化マグネシウム槽１）に、補充用の水酸化マグネシウム
（スラリー）を補充する工程を示す。なお、図には酸化
工程および二水石膏の除去工程などは省略されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a storage step of temporarily storing a mixed slurry of magnesium hydroxide and gypsum produced in a metathesis tank 2 for performing a metathesis reaction in the method of replenishing a magnesium compound as an absorbent according to the present invention. The step of replenishing magnesium tank 1) with replenishing magnesium hydroxide (slurry) is shown. It should be noted that the oxidation step and the gypsum removal step are omitted in the figure.
【０００８】図１において、回収水酸化マグネシウム槽
１は複分解槽２で生成する水酸化マグネシウムと二水石
膏との混合スラリーを貯蔵する槽で前記系内のマグネシ
ウム化合物を含む循環液のバッファーとして機能するも
のである。回収水酸化マグネシウム槽１から混合スラリ
ーがポンプおよびラインＬ５を経由して脱硫塔及び／又
は酸化槽（図示せず。）に送られ含有する水酸化マグネ
シウムが脱硫剤及び／又は中和剤として使用される。In FIG. 1, a recovered magnesium hydroxide tank 1 stores a mixed slurry of magnesium hydroxide and gypsum produced in a double decomposition tank 2 and functions as a buffer for a circulating liquid containing a magnesium compound in the system. Is what you do. The mixed slurry from the recovered magnesium hydroxide tank 1 is sent to a desulfurization tower and / or an oxidation tank (not shown) via a pump and a line L5, and the contained magnesium hydroxide is used as a desulfurizing agent and / or a neutralizing agent. Is done.
【０００９】長期の運転で、該ガス中に含まれる塵埃あ
るいは塩素分などの不純物が系内に蓄積されるため、ブ
ロー水として蓄積された不純物を系外に排出する必要が
ある。ブロー水とともにマグネシウム化合物もそのブロ
ー水を抜き出す部位に応じた形態で排出されるため、そ
れを補充する必要がある。ブロー水中に含まれて系外に
排出され損失となるマグネシウムの量に相当する水酸化
マグネシウムを補充するが、補充用の水酸化マグネシウ
ムは通常３０−３５重量％のスラリーとしてラインＬ１
経由所定量が回収水酸化マグネシウム槽１に供給され
る。ブロー水中に含まれるマグネシウムの濃度は補充さ
れる水酸化マグネシウムスラリー中のマグネシウムの濃
度に比較して極めて低いので、このままでは系内の水が
減少しマグネシウム／水のモルバランスが保たれない。
このバランスを保持するためブロー水に対応し、系内の
マグネシウム／水モルバランスが一定に保たれる量の水
が補充用水酸化マグネシウムスラリーの供給と同時にラ
インＬ２から供給される。補充される水の量は、ブロー
水として系外に排出される量、水酸化カルシウムスラリ
ーとして供給される量、水酸化マグネシウムスラリーと
して供給される量等を考慮に入れて算出することができ
る。系が定常状態になっている場合は、補充する水酸化
マグネシウム量に比例した量の水を供給すれば十分であ
る。[0009] In a long-term operation, impurities such as dust and chlorine contained in the gas are accumulated in the system, and it is necessary to discharge the impurities accumulated as blow water out of the system. Since the magnesium compound is discharged together with the blow water in a form corresponding to a portion from which the blow water is extracted, it is necessary to replenish the magnesium compound. Magnesium hydroxide corresponding to the amount of magnesium contained in the blow water and discharged out of the system and lost is replenished. The replenishing magnesium hydroxide is usually prepared as a slurry of 30 to 35% by weight in line L1.
A predetermined amount via the supply is supplied to the recovered magnesium hydroxide tank 1. Since the concentration of magnesium contained in the blow water is extremely lower than the concentration of magnesium in the magnesium hydroxide slurry to be replenished, the water in the system is reduced as it is, and the molar balance of magnesium / water cannot be maintained.
In order to maintain this balance, water is supplied from the line L2 at the same time as the supply of the replenishing magnesium hydroxide slurry, in correspondence with the blow water, so that the magnesium / water molar balance in the system is kept constant. The amount of replenished water can be calculated in consideration of the amount discharged as blow water out of the system, the amount supplied as calcium hydroxide slurry, the amount supplied as magnesium hydroxide slurry, and the like. When the system is in a steady state, it is sufficient to supply an amount of water proportional to the amount of magnesium hydroxide to be replenished.
【００１０】図２は、水酸化マグネシウム（スラリー）
を脱硫工程（脱硫塔３）に補充する例を示している。供
給する手段、量は図１の例と同じなので説明は省略す
る。なお図２には図１における複分解槽２、およびそれ
から回収水酸化マグネシウム槽１に至るラインＬ３、Ｌ
４は省略してある。この例で回収水酸化マグネシウム槽
１に液面計が設置されている。液面の位置が規定の位置
より低い場合は脱硫塔３及び／又は酸化槽（図示せ
ず。）に水酸化マグネシウムスラリーをラインＬ１を経
由して補充する。回収水酸化マグネシウム槽１の液面が
規定値より高い場合は、脱硫塔３及び／又は酸化槽への
補充を一時中断し、回収水酸化マグネシウム槽１からラ
インＬ６を経由して混合スラリーのみを供給する。その
後回収水酸化マグネシウム槽１の液面が規定の液面より
低下した時点で、水酸化マグネシウムスラリーの補充を
再開する。回収水酸化マグネシウム槽１の液面位置に応
じてこの操作を繰り返す。この操作はコンピュータによ
り自動的に行わせることができる。FIG. 2 shows magnesium hydroxide (slurry)
Is supplied to the desulfurization step (desulfurization tower 3). The means and amount of supply are the same as in the example of FIG. FIG. 2 shows the double decomposition tank 2 shown in FIG. 1 and the lines L3 and L3 from the double decomposition tank 2 to the recovered magnesium hydroxide tank 1.
4 is omitted. In this example, a liquid level gauge is installed in the recovered magnesium hydroxide tank 1. When the liquid level is lower than the prescribed position, the magnesium hydroxide slurry is replenished to the desulfurization tower 3 and / or the oxidation tank (not shown) via the line L1. When the liquid level of the recovered magnesium hydroxide tank 1 is higher than the specified value, the replenishment to the desulfurization tower 3 and / or the oxidation tank is temporarily suspended, and only the mixed slurry is recovered from the recovered magnesium hydroxide tank 1 via the line L6. Supply. Thereafter, when the liquid level in the recovered magnesium hydroxide tank 1 falls below a prescribed level, replenishment of the magnesium hydroxide slurry is restarted. This operation is repeated according to the liquid level of the recovered magnesium hydroxide tank 1. This operation can be automatically performed by a computer.
【００１１】また、図２の方法では、脱硫塔３の液面制
御のための水補給ラインを通常設置する。この場合、水
補給ラインを単独に設置してもよいが、ラインＬ２と兼
用で使用することもできる。In the method shown in FIG. 2, a water supply line for controlling the liquid level of the desulfurization tower 3 is usually installed. In this case, the water replenishment line may be installed independently, but may be used also as the line L2.
【００１２】[0012]
【実施例】実施例１ 図１に示す装置を用いて実施した。回収水酸化マグネシ
ウム槽にラインＬ３より水酸化マグネシウム１．５重量
％を含むスラリーが８７ｋｇ／ｈで供給され、ラインＬ
４から水酸化マグネシウム１．５重量％、二水石膏３０
重量％を含む混合スラリーが１５ｋｇ／ｈで抜き出され
回収水酸化マグネシウム槽に供給された。ラインＬ１よ
り補充用の３０重量％濃度の水酸化マグネシウムが０．
２ｋｇ／ｈで、同時に水３．８ｋｇ／ｈがラインＬ２か
ら回収水酸化マグネシウム槽に供給された。ラインＬ５
から水酸化マグネシウム１．５重量％、二水石膏４．３
重量％を含むスラリーが１０６ｋｇ／ｈで脱硫塔及び酸
化槽に送られた。ラインＬ１及びラインＬ２から供給さ
れる水酸化マグネシウムスラリーと水を合計した際のマ
グネシウム／水のモル比は石膏除去工程からブローされ
るマグネシウムと水のモル比に等しく設定されている。
長期運転における回収水酸化マグネシウム槽の水位の変
化は図３に示すように安定していた。EXAMPLE Example 1 was carried out using the apparatus shown in FIG. A slurry containing 1.5% by weight of magnesium hydroxide was supplied from the line L3 to the recovery magnesium hydroxide tank at a rate of 87 kg / h.
4 to 1.5% by weight of magnesium hydroxide, gypsum dihydrate 30
A mixed slurry containing 15% by weight was withdrawn at a rate of 15 kg / h and supplied to a recovered magnesium hydroxide tank. 30% by weight of magnesium hydroxide for replenishment was added from line L1 in a concentration of 0.1%.
At 2 kg / h, 3.8 kg / h of water was simultaneously supplied to the recovered magnesium hydroxide tank from line L2. Line L5
To 1.5% by weight of magnesium hydroxide, gypsum dihydrate 4.3
The slurry containing the weight% was sent to the desulfurization tower and the oxidation tank at 106 kg / h. The molar ratio of magnesium / water when the magnesium hydroxide slurry and water supplied from the lines L1 and L2 are summed is set equal to the molar ratio of magnesium and water blown from the gypsum removal step.
The change in the water level of the recovered magnesium hydroxide tank during long-term operation was stable as shown in FIG.
【００１３】実施例２ 図２に示す装置を用いて実施した。脱硫塔にラインＬ６
より水酸化マグネシウム１．５重量％、二水石膏４．５
重量％を含む混合スラリーが１０２ｋｇ／ｈで供給され
た。ラインＬ１より補充用の水酸化マグネシウムが３０
重量％の濃度で０．２ｋｇ／ｈで、同時に水３．８ｋｇ
／ｈがラインＬ２から脱硫塔に供給された。ラインＬ１
及びラインＬ２から供給される水酸化マグネシウムスラ
リーと水を合計した際のマグネシウム／水のモル比は石
膏の除去工程からブローされるマグネシウムと水のモル
比に等しく設定されている。長期運転における回収水酸
化マグネシウム槽の水位の変化は図３に示すようにゆる
やかであった。Example 2 An experiment was performed using the apparatus shown in FIG. Line L6 in desulfurization tower
Magnesium hydroxide 1.5% by weight, gypsum dihydrate 4.5
A mixed slurry containing 100% by weight was fed at 102 kg / h. 30 magnesium hydroxide for replenishment from line L1
0.2 kg / h at the concentration of wt% and 3.8 kg of water at the same time
/ H was supplied to the desulfurization tower from the line L2. Line L1
The molar ratio of magnesium / water when the magnesium hydroxide slurry and water supplied from the line L2 are summed is set equal to the molar ratio of magnesium and water blown from the gypsum removal step. Changes in the water level of the recovered magnesium hydroxide tank during long-term operation were moderate as shown in FIG.
【００１４】比較例１ 図４に示す装置を用いて実施した。回収水酸化マグネシ
ウム槽にラインＬ３より水酸化マグネシウム１．５重量
％を含むスラリーが８７ｋｇ／ｈで供給され、ラインＬ
４から水酸化マグネシウム１．５重量％、二水石膏３０
重量％を含む混合スラリーが１５ｋｇ／ｈで抜き出され
回収水酸化マグネシウム槽に供給された。回収水酸化マ
グネシウム槽の液面の位置が低く、一時的にラインＬ１
より補充用の３０重量％濃度の水酸化マグネシウムが
２．０ｋｇ／ｈで回収水酸化マグネシウム槽に供給され
た。ラインＬ５から水酸化マグネシウム２．０重量％、
二水石膏４．３重量％を含むスラリーが７８ｋｇ／ｈで
脱硫塔に送られた。その結果、流量のバランスが崩れ、
回収水酸化マグネシウム槽の液面が急に上昇した。液面
が規定の位置を超え水酸化マグネシウムスラリーの補充
を停止したが、回収水酸化マグネシウム槽の液面は上昇
し、その後低下し始めた。この現象を繰り返した。長期
運転における回収水酸化マグネシウム槽の水位の変化を
図３に示すように、上下の振幅がかなり大きかった。Comparative Example 1 An experiment was performed using the apparatus shown in FIG. A slurry containing 1.5% by weight of magnesium hydroxide was supplied from the line L3 to the recovery magnesium hydroxide tank at a rate of 87 kg / h.
4 to 1.5% by weight of magnesium hydroxide, gypsum dihydrate 30
A mixed slurry containing 15% by weight was withdrawn at a rate of 15 kg / h and supplied to a recovered magnesium hydroxide tank. The level of the liquid level in the recovered magnesium hydroxide tank is low, and the line L1 is temporarily
More replenishing magnesium hydroxide at a concentration of 30% by weight was supplied to the recovered magnesium hydroxide tank at 2.0 kg / h. 2.0% by weight of magnesium hydroxide from line L5,
A slurry containing 4.3% by weight of gypsum dihydrate was sent to the desulfurization tower at 78 kg / h. As a result, the flow rate is out of balance,
The liquid level in the recovered magnesium hydroxide tank suddenly rose. The liquid level exceeded the prescribed position and the replenishment of the magnesium hydroxide slurry was stopped, but the liquid level in the recovered magnesium hydroxide tank rose and then began to drop. This phenomenon was repeated. As shown in FIG. 3, the change in the water level of the recovered magnesium hydroxide tank during the long-term operation showed a considerably large vertical amplitude.
【００１５】[0015]
【発明の効果】本願発明の方法においては、ブロー水中
に含まれて系外に排出されるマグネシウム塩を水酸化マ
グネシウムとして補充するに当り、系内のマグネシウム
／水のモルバランスが一定範囲に保たれるように水を補
充するため、系内の水バランスが一定に保たれ脱硫装置
の運転が安定する。According to the method of the present invention, when replenishing magnesium salts contained in blow water and discharged out of the system as magnesium hydroxide, the molar balance of magnesium / water in the system is maintained within a certain range. Since the water is replenished so as to be dripped, the water balance in the system is kept constant, and the operation of the desulfurization device is stabilized.
【図１】本願発明の水酸化マグネシウムスラリーと水を
回収水酸化マグネシウム槽に補充する方法の例を示す図
である。FIG. 1 is a view showing an example of a method of replenishing a magnesium hydroxide slurry and water of the present invention into a recovered magnesium hydroxide tank.
【図２】本願発明の水酸化マグネシウムスラリーと水を
脱硫塔に補充する方法の例を示す図である。FIG. 2 is a diagram showing an example of a method of replenishing a magnesium hydroxide slurry and water of the present invention into a desulfurization tower.
【図３】回収水酸化マグネシウム槽の液面レベルの変化
を示す図である。FIG. 3 is a diagram showing a change in liquid level of a recovered magnesium hydroxide tank.
【図４】従来の水酸化マグネシウムスラリーの補充方法
を示す図である。FIG. 4 is a diagram showing a conventional method of replenishing a magnesium hydroxide slurry.
１ 回収水酸化マグネシウム槽 ２ 複分解槽 ３ 脱硫塔 Ｌ１−Ｌ６ 配管 1 recovery magnesium hydroxide tank 2 double decomposition tank 3 desulfurization tower L1-L6 piping
フロントページの続き (72)発明者 岡田 光生 東京都杉並区善福寺２−14−９ (72)発明者 島谷 哲 千葉県習志野市香澄４−２−１−１ (72)発明者 堀 文雄 大阪府堺市新堀町２−107 メゾンリーガ ル48 202号 Ｆターム(参考） 4D002 AA02 BA02 DA06 DA12 EA07 FA03 GB08 Continued on the front page (72) Inventor Mitsuo Okada 2-14-9 Zenfukuji, Suginami-ku, Tokyo (72) Inventor Tetsu Shimatani 4-2-1-1 Kasumi, Narashino-shi, Chiba Prefecture (72) Inventor Fumio Hori Osaka Sakai 2-107, Shinbori-cho, Maisonry Gal 48 202 F-term (reference) 4D002 AA02 BA02 DA06 DA12 EA07 FA03 GB08
Claims (4)
気ガスと気液接触させて排気ガス中に含まれる硫黄酸化
物を除去する脱硫工程と、脱硫工程液を酸素を含有する
ガスと接触させる酸化工程と、酸化工程処理液を塩基性
カルシウム化合物と複分解反応をさせ水酸化マグネシウ
ムと二水石膏とにする複分解工程を含み、複分解工程で
得られた水酸化マグネシウムと二水石膏を直接またはい
ったん貯蔵する貯蔵工程を経て脱硫工程及び／又は酸化
工程に送り、含有する水酸化マグネシウムを再び脱硫剤
または中和剤として使用する脱硫方法において、補充す
るマグネシウム系化合物を系内の全マグネシウム／水の
モル比に調整して系内に補充することを特徴とする排煙
脱硫方法における吸収剤の補充方法。1. A desulfurization step of removing sulfur oxides contained in exhaust gas by bringing the magnesium-based compound into absorbent and gas-liquid contact with an exhaust gas, and an oxidation step of bringing the desulfurization step liquid into contact with a gas containing oxygen. And a metathesis step of performing a metathesis reaction of the treatment liquid with the basic calcium compound to produce magnesium hydroxide and gypsum, and directly or once storing the magnesium hydroxide and gypsum obtained in the metathesis step In the desulfurization method using the magnesium hydroxide contained as a desulfurizing agent or neutralizing agent again after sending it to the desulfurizing step and / or the oxidizing step via the storage step, the magnesium compound to be replenished is mixed with the total magnesium / water molar ratio in the system. A method for replenishing an absorbent in a flue gas desulfurization method, wherein the replenisher is adjusted into the system and replenished into the system.
シウムと二水石膏を直接脱硫工程及び／又は酸化工程に
送る脱硫方法において、前記補充するマグネシウム系化
合物を脱硫工程及び／又は酸化工程に補充することを特
徴とする請求項１に記載の吸収剤の補充方法。2. A desulfurization method in which magnesium hydroxide and gypsum obtained in the metathesis step are directly sent to a desulfurization step and / or an oxidation step, wherein the replenishing magnesium-based compound is supplied to the desulfurization step and / or the oxidation step. The method for replenishing an absorbent according to claim 1, wherein
シウムと二水石膏をいったん貯蔵する貯蔵工程を経て脱
硫工程及び／又は酸化工程に送る脱硫方法において、前
記補充するマグネシウム系化合物を脱硫工程及び／又は
酸化工程及び／又は貯蔵工程に補充することを特徴とす
る請求項１に記載の吸収剤の補充方法。3. A desulfurization method in which a magnesium hydroxide and a dihydrate gypsum obtained in the metathesis step are temporarily stored and then sent to a desulfurization step and / or an oxidation step. The method for replenishing an absorbent according to claim 1, wherein the replenishment is carried out in an oxidation step and / or a storage step.
物を含む循環液のバッファーとして機能する貯槽を含
み、（１）該貯槽の液面が規定のレベルより高い場合
は、貯蔵工程より水酸化マグネシウムを含むスラリーを
脱硫工程及び／又は酸化工程に供給して液面が規定のレ
ベルより低下した時点で前記補充するマグネシウム化合
物を脱硫工程及び／又は酸化工程に補充し、（２）該貯
槽の液面が規定のレベルより低い場合は直ちに前記補充
するマグネシウム化合物を脱硫工程及び／又は酸化工程
に補充することを特徴とする請求項３に記載の吸収剤の
補充方法。4. The storage step includes a storage tank functioning as a buffer for a circulating liquid containing a magnesium compound in the system. (1) When the liquid level in the storage tank is higher than a specified level, the storage step may be performed using magnesium hydroxide. Is supplied to the desulfurizing step and / or the oxidizing step, and when the liquid level falls below a prescribed level, the replenishing magnesium compound is replenished to the desulfurizing step and / or the oxidizing step. The method according to claim 3, wherein the magnesium compound to be replenished is immediately replenished to the desulfurization step and / or the oxidation step when the surface is lower than a prescribed level.
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