JPH10109013A - Magnesium oxide and regenerated sulfuric acid recovering type flue gas desulfurization apparatus - Google Patents
Magnesium oxide and regenerated sulfuric acid recovering type flue gas desulfurization apparatusInfo
- Publication number
- JPH10109013A JPH10109013A JP8299216A JP29921696A JPH10109013A JP H10109013 A JPH10109013 A JP H10109013A JP 8299216 A JP8299216 A JP 8299216A JP 29921696 A JP29921696 A JP 29921696A JP H10109013 A JPH10109013 A JP H10109013A
- Authority
- JP
- Japan
- Prior art keywords
- magnesium
- solid
- flue gas
- magnesium oxide
- sulfuric acid
- 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
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- Treating Waste Gases (AREA)
Abstract
Description
【０００１】本発明は、酸化マグネシウムあるいは水酸
化マグネシウムを亜硫酸ガスの吸収剤として添加してい
る湿式排煙脱硫装置において、吸収液スラリーと排ガス
中の亜硫酸ガスおよび酸素ガスの吸収・反応で過飽和と
なって生成する固体状の亜硫酸マグネシウム、亜硫酸水
素マグネシウム、硫酸マグネシウム混合スラリーを分離
器等で固液分離し、ろ液は排煙脱硫装置の循環母液とし
て利用し、固体は分離し別の加熱炉で加熱分解して吸収
剤である酸化マグネシウムに再生し排煙脱硫装置の原料
の吸収剤として再利用する。この加熱分解時に発生する
二酸化イオウと三酸化イオウを主成分とするガスは触媒
等を介して酸化し、水に吸収させ硫酸等の副製品として
回収する。[0001] The present invention relates to a wet flue gas desulfurization apparatus to which magnesium oxide or magnesium hydroxide is added as an absorbent for sulfurous acid gas, wherein supersaturation is caused by absorption / reaction of sulfurous acid gas and oxygen gas in the absorbing slurry and exhaust gas. The solid magnesium-sulfite, magnesium-bisulfite, and magnesium-sulfate mixed slurries produced are separated into solid and liquid by a separator, etc., and the filtrate is used as a circulating mother liquor for flue gas desulfurization equipment. To regenerate into magnesium oxide as an absorbent and reuse it as the raw material absorbent for flue gas desulfurization equipment. The gas mainly composed of sulfur dioxide and sulfur trioxide generated during the thermal decomposition is oxidized through a catalyst or the like, absorbed in water, and recovered as a by-product such as sulfuric acid.
【０００２】従来、排ガス中の二酸化イオウおよび酸素
ガスを吸収した亜硫酸マグネシウム、亜硫酸水素マグネ
シウムおよび酸化マグネシウムは酸化塔を通して酸化さ
れＣＯＤ成分を除去し酸化マグネシウムとして排水処理
されていた。つまり吸収した排ガス中の二酸化イオウ
は、硫酸マグネシウムの形で排水として海に放流されて
いた。Conventionally, magnesium sulfite, magnesium bisulfite and magnesium oxide which have absorbed sulfur dioxide and oxygen gas in exhaust gas have been oxidized through an oxidation tower to remove COD components and have been subjected to wastewater treatment as magnesium oxide. In other words, the sulfur dioxide in the absorbed exhaust gas was discharged into the sea as wastewater in the form of magnesium sulfate.
【０００３】本発明は、排ガス中の二酸化イオウおよび
酸素ガスを吸収した亜硫酸マグネシウム、亜硫酸水素マ
グネシウムおよび硫酸マグネシウムは、吸収液スラリー
中で過飽和にし、分離機を介して固体として系外に排出
する。またこの固体を熱分解して酸化マグネシウムとガ
スに分解し、固体の酸化マグネシウムは系内に吸収剤と
して再利用し、ガスは硫酸等の副製品として回収する。According to the present invention, magnesium sulfite, magnesium bisulfite and magnesium sulfate that have absorbed sulfur dioxide and oxygen gas in an exhaust gas are supersaturated in an absorption slurry and discharged as a solid through a separator. The solid is thermally decomposed into magnesium oxide and gas, and the solid magnesium oxide is reused in the system as an absorbent, and the gas is recovered as a by-product such as sulfuric acid.
【０００４】このようにすれば、排ガス中の二酸化イオ
ウをこの排煙脱硫装置を通して硫酸等の副製品として回
収することができるので、排煙脱硫装置から排水を発生
することがなく環境対策上有利である。また原材料であ
る酸化マグネシウムを再生利用することができるので、
酸化マグネシウムの鉱物資源を節約することができる。
また副製品として工業薬品の硫酸等が生成され、売却す
ることができるので排煙脱硫装置の経費の節減を計るこ
とができる。[0004] In this way, sulfur dioxide in the exhaust gas can be recovered as a by-product such as sulfuric acid through the flue gas desulfurization device, so that no wastewater is generated from the flue gas desulfurization device, which is advantageous in environmental measures. It is. Also, since the raw material magnesium oxide can be recycled,
The mineral resources of magnesium oxide can be saved.
Also, sulfuric acid and the like, an industrial chemical, are produced as by-products and can be sold, so that the cost of the flue gas desulfurization device can be reduced.
【０００５】[0005]
【産業上の利用分野】本発明は、イオウ分を含有する石
炭あるいは重油等を燃焼させるボイラーを有する火力発
電所等の排ガス中の二酸化イオウを除去する排煙脱硫装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas desulfurization apparatus for removing sulfur dioxide in exhaust gas from a thermal power plant having a boiler for burning coal or heavy oil containing sulfur.
【０００６】[0006]
【従来の技術】従来、火力発電ボイラーに採用されてい
る排煙脱硫装置の処理法として、石灰石−石膏法、Ｍｇ
−石膏法、水マグ吸収法等が知られている。石灰石−石
膏法では、脱硫原材料として炭酸カルシウムを使用し、
副製品として石膏を発生し、二酸化イオウの負荷に対応
して炭酸カルシウムを補給する必要がある。この方式で
の吸収塔での液ガス比（吸収塔循環液量／排ガス量）は
１７程度で吸収能力が比較的小さいため、吸収循環液量
を比較的大きくする必要がある。この処理法の特徴は、
原材料の炭酸カルシウムの単価が比較的安いが動力費が
高いという特徴がある。2. Description of the Related Art Limestone-gypsum method, Mg
-Gypsum method, water mug absorption method and the like are known. In the limestone-gypsum method, calcium carbonate is used as a desulfurization raw material,
It produces gypsum as a by-product and needs to be supplemented with calcium carbonate in response to sulfur dioxide loading. Since the liquid-gas ratio (the amount of circulating liquid in the absorption tower / the amount of exhaust gas) in the absorption tower in this method is about 17 and the absorption capacity is relatively small, the amount of the circulating liquid needs to be relatively large. The feature of this processing method is
The unit price of calcium carbonate, which is a raw material, is relatively low, but power costs are high.
【０００７】また、Ｍｇ−石膏法は、吸収剤として水酸
化カルシウムを使用し脱硫吸収能力を高めるためにマグ
ネシウムイオンとして水酸化マグネシウムを添加し液ガ
ス比を６程度にし、吸収塔循環液量を小さくして動力費
の節減を行っていることが特徴である。副製品として石
膏を発生し、原料は単価が炭酸カルシウムの約２倍の水
酸化マグネシウムを使用する必要がある。In the Mg-gypsum method, calcium hydroxide is used as an absorbent, magnesium hydroxide is added as magnesium ions in order to increase the desulfurization absorption capacity, the liquid-gas ratio is adjusted to about 6, and the amount of circulating liquid in the absorption tower is reduced. The feature is that the power cost is reduced by making it smaller. Gypsum is produced as a by-product, and the raw material must use magnesium hydroxide, which is about twice as expensive as calcium carbonate.
【０００８】また、水マグ吸収法では、吸収剤として水
酸化マグネシウムあるいは酸化マグネシウムを使用し、
二酸化イオウ吸収能力が高いために液ガス比は６程度で
運転され吸収塔スラリー循環量を小さくして吸収塔循環
ポンプの動力費の節減を行っている。副製品は二酸化イ
オウを吸収して生成した亜硫酸マグネシウムおよび亜硫
酸水素マグネシウムを酸化塔で酸化し硫酸マグネシウム
として排水されている。In the water mug absorption method, magnesium hydroxide or magnesium oxide is used as an absorbent,
Since the sulfur dioxide absorption capacity is high, the liquid-gas ratio is operated at about 6, and the circulation amount of the absorption tower slurry is reduced to reduce the power cost of the absorption tower circulation pump. As a by-product, magnesium sulfite and magnesium bisulfite generated by absorbing sulfur dioxide are oxidized in an oxidation tower and discharged as magnesium sulfate.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、原材料とし
て酸化マグネシウムの吸収剤を使用するので、吸収塔で
の二酸化イオウの吸収能力は高く水マグ吸収法と同様に
液ガス比を６程度にして吸収塔循環ポンプの動力費を節
減しているが、吸収液が二酸化イオウを吸収して生成す
る亜硫酸マグネシウム、亜硫酸水素マグネシウムおよび
硫酸マグネシウムを過飽和にして発生した固体をシック
ナーおよび分離機で分離し系外に固体として排出するの
で排水が発生せず公害上問題がない。また、排出した固
体は別置きの加熱塔で熱分解され、酸化マグネシウムに
再生し再び二酸化イオウを吸収する排煙脱硫装置の原材
料として再使用することができるので、二酸化イオウ吸
収の当量だけ使用していた従来のような追加的原材料使
用の必要がなく、鉱物の省資源化が計れている。また、
排出された固体の熱分解で得られた二酸化イオウおよび
三酸化イオウは価値の高い工業薬品である硫酸として回
収利用することができ、売却できるので排煙脱硫コスト
を低くすることができる。また、別置きの加熱塔の排熱
はボイラー等に回収することもできる。つまり本発明
は、熱エネルギーは多少従来より余分に消費するが、脱
硫効率が高く、排水および石膏等の産業副産物が発生せ
ず、価値のある硫酸等の工業薬品を生成し、追加的鉱物
原材料も消費しない鉱物資源の有効利用が計れる湿式排
煙脱硫装置である。According to the present invention, since an absorbent of magnesium oxide is used as a raw material, the absorption capacity of sulfur dioxide in the absorption tower is high and the liquid-gas ratio is set to about 6 as in the water-mag absorption method. Although the power cost of the absorption tower circulating pump is reduced, the absorption liquid absorbs sulfur dioxide, and supersaturates magnesium sulfite, magnesium bisulfite, and magnesium sulfate. Since it is discharged as a solid outside the system, no wastewater is generated and there is no problem in terms of pollution. The discharged solid is thermally decomposed in a separate heating tower, regenerated into magnesium oxide, and can be reused as a raw material for a flue gas desulfurization unit that absorbs sulfur dioxide again. This eliminates the need for the use of additional raw materials as in the past, and is saving resources for minerals. Also,
Sulfur dioxide and sulfur trioxide obtained by pyrolysis of the discharged solid can be recovered and used as sulfuric acid, a valuable industrial chemical, and can be sold, so that the cost of flue gas desulfurization can be reduced. Also, the exhaust heat of the separately installed heating tower can be recovered in a boiler or the like. That is, the present invention consumes thermal energy somewhat more than before, but has high desulfurization efficiency, does not generate industrial by-products such as wastewater and gypsum, generates valuable industrial chemicals such as sulfuric acid, and generates additional mineral raw materials. This is a wet type flue gas desulfurization unit that can effectively utilize mineral resources that do not consume too much.
【００１０】[0010]
【課題を解決するための手段】本発明は、液ガス比を下
げ吸収塔循環液量を減少して省エネルギー化を計るため
に原材料として脱硫効率が高く反応力の高い酸化マグネ
シウムを使用している。また、湿式排煙脱硫装置から排
水および廃棄物を出さないようにするために、吸収液が
二酸化イオウを吸収した後に生成する亜硫酸マグネシウ
ム、亜硫酸水素マグネシウム、硫酸マグネシウムを吸収
液中で過飽和にして固体として析出させ、分離器で分離
して固体として系外に排出する。また、酸化マグネシウ
ム等の原材料の使用をできるだけ少なくするために、固
体として系外に排出された亜硫酸マグネシウム、亜硫酸
水素マグネシウム、硫酸マグネシウムを加熱器で熱分解
し、酸化マグネシウムにして再利用する。また、石灰石
一石膏法のように石膏等の産業廃棄物を生成しないよう
にするために、加熱器で発生した二酸化イオウおよび三
酸化イオウのガスは触媒酸化し、水に溶解させ硫酸等の
工業製品にする。According to the present invention, magnesium oxide having high desulfurization efficiency and high reactivity is used as a raw material in order to reduce the liquid-gas ratio and reduce the amount of circulating liquid in the absorption tower to save energy. . In order to prevent wastewater and waste from being discharged from the wet flue gas desulfurization unit, magnesium sulfite, magnesium bisulfite, and magnesium sulfate generated after the absorption liquid absorbs sulfur dioxide are supersaturated in the absorption liquid and solidified. , Separated by a separator and discharged out of the system as a solid. Further, in order to minimize the use of raw materials such as magnesium oxide, magnesium sulfite, magnesium bisulfite, and magnesium sulfate discharged out of the system as solids are thermally decomposed by a heater and reused as magnesium oxide. In addition, in order to prevent industrial waste such as gypsum from being produced as in the limestone-gypsum method, sulfur dioxide and sulfur trioxide gas generated by a heater is oxidized by a catalyst and dissolved in water to be dissolved in water to produce industrial gases such as sulfuric acid. Make a product.
【００１１】[0011]
【作用】本発明は、固体として亜硫酸マグネシウム、亜
硫酸水素マグネシウム、硫酸マグネシウムを吸収液中に
析出させ固液分離するが、酸化マグネシウムを添加し吸
収塔循環液が亜硫酸ガスを吸収し、吸収液ｐＨ値を６程
度に一定に維持しながら脱硫を継続すると、循環液中の
亜硫酸マグネシウム、亜硫酸水素マグネシウム、硫酸マ
グネシウムが過飽和溶液になり、固体が析出するように
なる。固体の析出スラリー濃度が１０〜１５ｗｔ％にな
れば、吸収塔から連続的引き抜き、分離器等で固液分離
し、固体は系外へ排出し、ろ液は酸化マグネシウムの吸
収剤を溶解する母液として利用し、再び吸収塔循環液ス
ラリーのｐＨ値維持用のアルカリ吸収剤とする。また、
固液分離された固体は、加熱器で熱分解され、固体は酸
化マグネシウムの吸収剤として再利用する。加熱器から
発生する亜硫酸ガスおよび三酸化イオウのガスは触媒酸
化し水に溶解して硫酸等の工業薬品として利用する。According to the present invention, magnesium sulfite, magnesium bisulfite and magnesium sulfate are precipitated as solids in an absorbing solution and separated into solid and liquid. However, magnesium oxide is added, and the circulating fluid in the absorption tower absorbs sulfurous acid gas, and the pH of the absorbing solution is increased. When desulfurization is continued while the value is kept constant at about 6, magnesium sulfite, magnesium bisulfite and magnesium sulfate in the circulating liquid become supersaturated solutions, and solids are deposited. When the concentration of the solid precipitate slurry becomes 10 to 15 wt%, it is continuously withdrawn from the absorption tower, separated into solid and liquid by a separator or the like, the solid is discharged out of the system, and the filtrate is a mother liquor that dissolves the magnesium oxide absorbent. Again as an alkali absorbent for maintaining the pH value of the slurry in the absorption tower circulating liquid. Also,
The solid that has been solid-liquid separated is thermally decomposed by a heater, and the solid is reused as an absorbent for magnesium oxide. Sulfurous acid gas and sulfur trioxide gas generated from the heater are oxidized catalytically and dissolved in water to be used as industrial chemicals such as sulfuric acid.
【００１２】[0012]
【実施例】スプレー塔の吸収塔を有する湿式排煙脱硫装
置において、吸収塔部の液ガス比（１／ｍ３Ｎ）は６に
して気液接触により脱硫運転し、原材料は酸化マグネシ
ウムで水に溶解して水酸化マグネシウムの３０％スラリ
ーで吸収塔に供給し、吸収塔循環スラリーｐＨ値は５．
９程度になるように、脱硫負荷に応じて原材料の供給量
を増減することによって行う。吸収塔循環液スラリー濃
度が約１０〜１５％の一定になるように吸収塔循環スラ
リーを引き抜く。 引き抜かれた
スラリーは、重力沈降濃縮するシックナーにより３０％
以上に濃縮されたスラリーは遠心分離機等の分離器で固
液分離する。ろ液は原材料の吸収剤である酸化マグネシ
ウムを溶解させる母液として利用し、その他のものは吸
収塔に回収し、補給水とともに吸収塔のレベルを制御す
るのに使用する。遠心分離機で固液分離した固体は、加
熱分解装置に送られ、熱分解される。熱分解され生成し
た酸化マグネシウムは、母液で溶解・反応させ水酸化マ
グネシウムの３０％スラリーで吸収塔に供給し、脱硫装
置の原材料として再利用する。また、固体の加熱分解装
置で発生するガスは硫酸等の工業薬品に変換する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a wet flue gas desulfurization apparatus having an absorption tower as a spray tower, the liquid-gas ratio (1 / m 3 N) of the absorption tower is set to 6 and desulfurization operation is performed by gas-liquid contact. And supplied to the absorption tower with a 30% slurry of magnesium hydroxide.
This is performed by increasing or decreasing the supply amount of the raw materials according to the desulfurization load so that the amount becomes about 9. The absorption tower circulation slurry is withdrawn so that the absorption tower circulation liquid slurry concentration is constant at about 10 to 15%. The extracted slurry is 30% thickened by gravity sedimentation
The concentrated slurry is subjected to solid-liquid separation by a separator such as a centrifuge. The filtrate is used as a mother liquor for dissolving the raw material absorbent magnesium oxide, and the other is collected in the absorption tower and used together with make-up water to control the level of the absorption tower. The solid that has been solid-liquid separated by the centrifugal separator is sent to a thermal decomposition device and pyrolyzed. The magnesium oxide generated by the thermal decomposition is dissolved and reacted with the mother liquor, supplied to the absorption tower as a 30% slurry of magnesium hydroxide, and reused as a raw material for the desulfurization apparatus. The gas generated by the solid thermal decomposition device is converted into industrial chemicals such as sulfuric acid.
【００１３】以下、図面を参照して、この発明の実施例
を説明する。An embodiment of the present invention will be described below with reference to the drawings.
【００１４】図１は、酸化マグネシウム再生硫酸回収型
排煙脱硫装置のフロー図を示す。亜硫酸ガスを約３００
〜１０００ｐｐｍ含むボイラー排ガス１５は、スプレー
塔である吸収塔２に導入され、吸収塔循環ポンプ１２に
よりスプレーノズルを通して分散した循環吸収液スラリ
ーと気液接触して、亜硫酸ガスが吸収液スラリーに吸収
され脱硫される。亜硫酸ガスを吸収した吸収塔循環スラ
リーは、シックナー３に送られ、スラリーが濃縮され、
濃縮スラリーは遠心分離機５に送られ脱水される。シッ
クナー３の上水はろ液タンク４に送液される。遠心分離
機５のろ液もろ液タンク４に送られ母液として原料調整
タンク１０へ、ろ液ポンプ１４で送られ、酸化マグネシ
ウムホッパー１からの酸化マグネシウムを溶解するリパ
ルプ液として利用する。ろ液ポンプ１４からの余分な母
液は吸収塔に供給される。遠心分離機５から発生した亜
硫酸マグネシウム、亜硫酸水素マグネシウム、硫酸マグ
ネシウムを含む固体は、加熱分離装置６に送られ、加熱
分解される。加熱分解して得られた酸化マグネシウム
は、酸化マグネシウムホッパー１に送られ原材料として
再利用される。加熱分解装置６で発生するガスは、硫酸
発生装置７に送られ触媒等で酸化し水に吸収して硫酸タ
ンク８に回収し、工業薬品として利用する。FIG. 1 shows a flow chart of a flue gas desulfurization apparatus for recovering magnesium oxide and sulfuric acid. Approximately 300 sulfur dioxide gas
The boiler exhaust gas 15 containing up to 1000 ppm is introduced into the absorption tower 2 which is a spray tower, is brought into gas-liquid contact with the circulating absorption slurry dispersed through the spray nozzle by the absorption tower circulation pump 12, and the sulfurous acid gas is absorbed into the absorption slurry. Desulfurized. The slurry circulated in the absorption tower that has absorbed the sulfurous acid gas is sent to the thickener 3 where the slurry is concentrated.
The concentrated slurry is sent to the centrifugal separator 5 and dewatered. Water from the thickener 3 is sent to the filtrate tank 4. The filtrate of the centrifugal separator 5 is also sent to the filtrate tank 4 and sent as a mother liquor to the raw material adjustment tank 10 by the filtrate pump 14 and used as a repulp solution for dissolving magnesium oxide from the magnesium oxide hopper 1. Excess mother liquor from the filtrate pump 14 is supplied to the absorption tower. The solid containing magnesium sulfite, magnesium bisulfite, and magnesium sulfate generated from the centrifugal separator 5 is sent to the heat separation device 6 and is thermally decomposed. Magnesium oxide obtained by thermal decomposition is sent to a magnesium oxide hopper 1 and reused as a raw material. The gas generated in the thermal decomposition device 6 is sent to a sulfuric acid generator 7 and oxidized by a catalyst or the like, absorbed in water, collected in a sulfuric acid tank 8, and used as an industrial chemical.
【００１５】[0015]
【発明の効果】本発明は、排水が出ないので公害発生の
おそれがなく、原材料の酸化マグネシウムは再生される
ので原材料の補給がほとんどいらない。排ガス中の脱硫
されたイオウ分は、硫酸の形で回収され、工業薬品とし
て利用できるので有利である。また石膏等の副産物が発
生せず、セメント等に混合して処理する必要がないの
で、セメントに混合して処理している石炭灰等の処理す
る余地が増大し、産業廃棄物の有効利用上有利である。According to the present invention, since there is no drainage, there is no danger of pollution, and magnesium oxide as a raw material is regenerated, so that replenishment of the raw material is hardly required. The desulfurized sulfur component in the exhaust gas is advantageously recovered in the form of sulfuric acid and can be used as an industrial chemical. In addition, since by-products such as gypsum are not generated and there is no need to mix and treat with cement, etc., there is more room for the treatment of coal ash and the like that is mixed with cement and treated. It is advantageous.
【００１６】[0016]
【図１】図１は、酸化マグネシウム再生硫酸回収型排煙
脱硫装置のフロー図である。FIG. 1 is a flow chart of a flue gas desulfurization apparatus that recovers magnesium oxide and recovers sulfuric acid.
【符号の説明】 １ 酸化マグネシウムホッパー ２ 吸収塔 ３ シックナー ４ ろ液タンク ５ 遠心分離機 ６ 加熱分解装置 ７ 硫酸発生装置 ８ 硫酸貯蔵タンク ９ 煙突 １０ 原料調整槽 １１ 原料供給ポンプ １２ 吸収塔循環ポンプ １３ シックナー抜き出しポンプ １４ ろ液ポンプ １５ ボイラー排ガス １６ 供給水DESCRIPTION OF SYMBOLS 1 Magnesium oxide hopper 2 Absorption tower 3 Thickener 4 Filtrate tank 5 Centrifuge 6 Heat decomposition device 7 Sulfuric acid generator 8 Sulfuric acid storage tank 9 Chimney 10 Raw material adjusting tank 11 Raw material supply pump 12 Absorption tower circulation pump 13 Thickener withdrawal pump 14 Filtrate pump 15 Boiler exhaust gas 16 Supply water
Claims (1)
シウムを吸収剤として添加している湿式排煙脱硫装置に
おいて、吸収液スラリーと排ガス中の亜硫酸ガスおよび
酸素ガスの吸収・反応で生成する亜硫酸マグネシウム、
亜硫酸水素マグネシウム、硫酸マグネシウムの混合スラ
リーを脱水機等で固液分離し、これらの成分を含む固体
を加熱・分解し得られる固体状の酸化マグネシウムは排
煙脱硫装置の吸収剤として再利用し、同時に発生する二
酸化イオウおよび三酸化イオウを含むガスは酸化・吸収
させ硫酸等の副製品として生産することを特徴とする排
煙脱硫装置。1. A wet flue gas desulfurization apparatus to which magnesium oxide or magnesium hydroxide is added as an absorbent, wherein magnesium sulfite produced by absorbing and reacting sulfuric acid gas and oxygen gas in the absorption liquid slurry and exhaust gas,
A mixed slurry of magnesium bisulfite and magnesium sulfate is separated into solid and liquid by a dehydrator or the like, and solid magnesium oxide obtained by heating and decomposing a solid containing these components is reused as an absorbent for a flue gas desulfurization device. A flue gas desulfurization unit characterized in that a gas containing sulfur dioxide and sulfur trioxide generated at the same time is oxidized and absorbed and produced as a by-product such as sulfuric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8299216A JPH10109013A (en) | 1996-10-04 | 1996-10-04 | Magnesium oxide and regenerated sulfuric acid recovering type flue gas desulfurization apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8299216A JPH10109013A (en) | 1996-10-04 | 1996-10-04 | Magnesium oxide and regenerated sulfuric acid recovering type flue gas desulfurization apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10109013A true JPH10109013A (en) | 1998-04-28 |
Family
ID=17869663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8299216A Pending JPH10109013A (en) | 1996-10-04 | 1996-10-04 | Magnesium oxide and regenerated sulfuric acid recovering type flue gas desulfurization apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10109013A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007038188A (en) * | 2005-08-05 | 2007-02-15 | Kurita Water Ind Ltd | Method and apparatus for desulfurizing hydrogen sulfide-containing gas |
| WO2009039579A1 (en) * | 2007-09-26 | 2009-04-02 | Bhp Billiton Ssm Development Pty Ltd | Acid recovery from metal sulfates |
| CN102101004A (en) * | 2011-01-26 | 2011-06-22 | 中节能六合天融环保科技有限公司 | Method for recovering magnesium oxide and byproduct sulfur dioxide by using indirect heating rotary roasting furnace |
| CN103394281A (en) * | 2013-08-08 | 2013-11-20 | 常州联慧资源环境科技有限公司 | Water expansion control and desulfurization product slurry concentration method for magnesium-method flue gas desulfurization system |
| CN104528781A (en) * | 2014-11-26 | 2015-04-22 | 中化化肥有限公司成都研发中心 | Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings |
| CN104556159A (en) * | 2014-12-15 | 2015-04-29 | 北京中晶佳镁环境科技股份有限公司 | Device and method for producing magnesium sulfite by flue gas desulfurization |
| CN104556157A (en) * | 2014-12-03 | 2015-04-29 | 北京中晶佳镁环境科技股份有限公司 | Magnesium sulfate production device and method by flue gas desulfurization |
| CN106268173A (en) * | 2016-08-29 | 2017-01-04 | 合肥合意环保科技工程有限公司 | A kind of method of flue gas desulfurization |
| CN107827130A (en) * | 2017-12-13 | 2018-03-23 | 青岛锐丰源化工有限公司 | Utilize the production line for being alkylated spent acid and preparing magnesium sulfate |
| CN109395552A (en) * | 2018-11-16 | 2019-03-01 | 承德信通首承矿业有限责任公司 | A kind of liquid vapour vortex phase transformation integrated desulfurization and byproduct recovery process |
| JP2020089804A (en) * | 2018-12-03 | 2020-06-11 | 住友金属鉱山株式会社 | Detoxification method of exhaust gas containing sulfur dioxide |
| JP2020176057A (en) * | 2018-08-08 | 2020-10-29 | 宇部興産株式会社 | Manufacturing method of cement composition, and manufacturing system of cement composition |
| CN112999836A (en) * | 2021-02-20 | 2021-06-22 | 福建中欣氟材高宝科技有限公司 | Preparation method of magnesium sulfate |
-
1996
- 1996-10-04 JP JP8299216A patent/JPH10109013A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007038188A (en) * | 2005-08-05 | 2007-02-15 | Kurita Water Ind Ltd | Method and apparatus for desulfurizing hydrogen sulfide-containing gas |
| WO2009039579A1 (en) * | 2007-09-26 | 2009-04-02 | Bhp Billiton Ssm Development Pty Ltd | Acid recovery from metal sulfates |
| CN102101004A (en) * | 2011-01-26 | 2011-06-22 | 中节能六合天融环保科技有限公司 | Method for recovering magnesium oxide and byproduct sulfur dioxide by using indirect heating rotary roasting furnace |
| CN103394281A (en) * | 2013-08-08 | 2013-11-20 | 常州联慧资源环境科技有限公司 | Water expansion control and desulfurization product slurry concentration method for magnesium-method flue gas desulfurization system |
| CN104528781A (en) * | 2014-11-26 | 2015-04-22 | 中化化肥有限公司成都研发中心 | Method for removing sulfur dioxide in flue gas and preparing magnesium sulfate by utilizing phosphorus floatation tailings |
| CN104556157A (en) * | 2014-12-03 | 2015-04-29 | 北京中晶佳镁环境科技股份有限公司 | Magnesium sulfate production device and method by flue gas desulfurization |
| CN104556159A (en) * | 2014-12-15 | 2015-04-29 | 北京中晶佳镁环境科技股份有限公司 | Device and method for producing magnesium sulfite by flue gas desulfurization |
| CN106268173A (en) * | 2016-08-29 | 2017-01-04 | 合肥合意环保科技工程有限公司 | A kind of method of flue gas desulfurization |
| CN107827130A (en) * | 2017-12-13 | 2018-03-23 | 青岛锐丰源化工有限公司 | Utilize the production line for being alkylated spent acid and preparing magnesium sulfate |
| CN107827130B (en) * | 2017-12-13 | 2024-04-02 | 青岛锐丰源化工有限公司 | Production line for preparing magnesium sulfate by using alkylated waste acid |
| JP2020176057A (en) * | 2018-08-08 | 2020-10-29 | 宇部興産株式会社 | Manufacturing method of cement composition, and manufacturing system of cement composition |
| CN109395552A (en) * | 2018-11-16 | 2019-03-01 | 承德信通首承矿业有限责任公司 | A kind of liquid vapour vortex phase transformation integrated desulfurization and byproduct recovery process |
| CN109395552B (en) * | 2018-11-16 | 2022-03-15 | 承德信通首承科技有限责任公司 | Liquid-steam vortex phase-change integrated desulfurization and byproduct recovery process |
| JP2020089804A (en) * | 2018-12-03 | 2020-06-11 | 住友金属鉱山株式会社 | Detoxification method of exhaust gas containing sulfur dioxide |
| CN112999836A (en) * | 2021-02-20 | 2021-06-22 | 福建中欣氟材高宝科技有限公司 | Preparation method of magnesium sulfate |
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