JPH05208815A - Production of gypsum - Google Patents

Production of gypsum

Info

Publication number
JPH05208815A
JPH05208815A JP4015667A JP1566792A JPH05208815A JP H05208815 A JPH05208815 A JP H05208815A JP 4015667 A JP4015667 A JP 4015667A JP 1566792 A JP1566792 A JP 1566792A JP H05208815 A JPH05208815 A JP H05208815A
Authority
JP
Japan
Prior art keywords
sulfur
slurry
gypsum
per unit
gas
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
Application number
JP4015667A
Other languages
Japanese (ja)
Inventor
Masaaki Yamamoto
雅章 山本
Minoru Miyake
実 三宅
Koji Arakawa
康志 荒川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP4015667A priority Critical patent/JPH05208815A/en
Publication of JPH05208815A publication Critical patent/JPH05208815A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/46Sulfates
    • C01F11/464Sulfates of Ca from gases containing sulfur oxides

Abstract

PURPOSE:To accurately determine an amount of milky lime used when gypsum is produced. CONSTITUTION:In a method for producing gypsum by passing a coke furnace gas into an adsorbing liquid, adsorbing H2S contained in the coke furnace gas into the adsorbing liquid, recovering the H2S as sulfur slurry, burning the slurry to generate SO2 gas, adsorbing the SO2 gas into milky lime to give CaSO3, oxidizing CaSO3 to afford CaSO4 and hydrating CaSO4, solid concentration of sulfur slurry and sulfur content in slurry liquid is estimated from density of sulfur slurry measured with a hydrometer. The sulfur feed amount (per unit time) fed for producing gypsum is calculated from the estimated value and the amount of milky lime per unit time is fed correspondingly to this sulfur feed amount per unit time. Thereby the used amount of milky lime is reduced and quality of gypsum is stabilized.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、石膏の製造方法に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing gypsum.

【0002】[0002]

【従来の技術】コークス炉ガス中に含まれたH2Sは、
そのまま含有させておくとコークス炉ガスを使用する設
備や配管を腐食させるので、コークス炉ガスを吸収液中
を通過させ、この吸収液中にH2Sを吸収し、硫黄スラ
リーとして回収するようにしている。そして、この硫黄
スラリーを燃焼させてSO2ガスを発生させ、このSO2
ガスを石灰乳Ca(OH)2(水酸化カルシューム)に
吸収させてCaSO3とした後、酸化させてCaSO4
し、これを水和させて石膏を製造するのが一般的であ
る。
2. Description of the Related Art H 2 S contained in coke oven gas is
If it is contained as it is, it will corrode the equipment and pipes that use the coke oven gas, so pass the coke oven gas through the absorption liquid, absorb H 2 S in this absorption liquid, and collect it as a sulfur slurry. ing. Then, the combustion of the sulfur slurry to generate SO 2 gas, the SO 2
It is common practice to absorb gas into lime milk Ca (OH) 2 (calcium hydroxide) to form CaSO 3 , then oxidize it to CaSO 4, and hydrate this to produce gypsum.

【0003】上述した石膏の製造工程を図3の工程図に
より説明すると、次のとおりである。回収された硫黄ス
ラリーは燃焼炉21に送られ、ここで噴霧状にして燃焼
する。硫黄スラリーが燃焼すると燃焼排ガス中に多量の
SO2ガスが発生するが、このSO2ガスを燃焼排ガスと
ともにSO2吸収塔22に送り、循環槽23からポンプ
24により循環してSO2吸収塔22に供給される石灰
乳に吸収させる。石灰乳とSO2が反応するとCaSO3
が生成され、このCaSO3は粒子状となって未反応の
石灰乳中に取り込まれる。そして、最終的には循環槽2
3の底部に堆積することになるので、堆積したCaSO
3をポンプ25で抜き取り、酸化塔26に送って空気と
反応させて酸化しCaSO4とする。さらに、このCa
SO4を石膏シックナー27に送って水和させ、これを
ポンプ28で石膏分離機29に送り、水分を除去して石
膏(CaSO4・2H2O)が得られる。
The manufacturing process of the above-mentioned gypsum will be described below with reference to the process chart of FIG. The recovered sulfur slurry is sent to the combustion furnace 21 where it is atomized and burned. When the sulfur slurry burns, a large amount of SO 2 gas is generated in the combustion exhaust gas, and this SO 2 gas is sent to the SO 2 absorption tower 22 together with the combustion exhaust gas, and is circulated by the pump 24 from the circulation tank 23 to the SO 2 absorption tower 22. It is absorbed by lime milk supplied to. When lime milk and SO 2 react, CaSO 3
Are produced, and this CaSO 3 becomes particulate and is taken into unreacted lime milk. And finally, the circulation tank 2
Since it will be deposited at the bottom of No. 3, the deposited CaSO
3 is taken out by a pump 25, sent to an oxidation tower 26 and reacted with air to be oxidized into CaSO 4 . Furthermore, this Ca
SO 4 is sent to the gypsum thickener 27 to be hydrated, and this is sent to the gypsum separator 29 by the pump 28 to remove water to obtain gypsum (CaSO 4 .2H 2 O).

【0004】ところで、SO2吸収塔22に循環供給さ
れる石灰乳の供給量が適正でないと、次のような問題が
ある。すなわち、SO2吸収塔22に供給されるSO2
スが十分に吸収されるだけ石灰乳が供給されないと、S
2が廃ガス中に含まれて放散され、環境汚染の原因と
なる。また、石灰乳の供給量が多過ぎると、石灰乳のロ
スが大きく、製品石膏に石灰が混入するため、品質低下
につながる。さらには、石灰乳とSO2が反応すると、
石灰乳中のCa分が減少するので、Ca分が一定値以下
になった場合も新しい石灰乳を供給する必要がある。
If the amount of lime milk that is circulated and supplied to the SO 2 absorption tower 22 is not appropriate, the following problems will occur. That is, if the lime milk is not supplied enough to absorb the SO 2 gas supplied to the SO 2 absorption tower 22, S
O 2 is contained in the waste gas and is emitted, which causes environmental pollution. Further, when the amount of lime milk supplied is too large, the loss of lime milk is large and lime is mixed into the product plaster, which leads to a deterioration in quality. Furthermore, when lime milk and SO 2 react,
Since the Ca content in lime milk decreases, it is necessary to supply new lime milk even when the Ca content falls below a certain value.

【0005】上述した石灰乳の循環供給量のコントロー
ルおよび石灰乳中のCa分の濃度のコントロールは、従
来次のような方法で行っていた。
The above-described control of the circulating supply amount of lime milk and the control of the concentration of Ca in lime milk have been conventionally performed by the following methods.

【0006】(1)循環供給量 図3に示すように、SO2吸収塔22の燃焼排ガス入
口ににSO2の濃度を測定するSO2濃度計30を設け、
廃ガス中のSO2濃度が常に100ppm以下程度にな
るように、供給量をコントロールする。 特開平3−181315に開示された技術に基づき、
SO2吸収塔22に供給する燃焼排ガスを不活性ガスで
希釈し、希釈した燃焼排ガス中のSO2の濃度を測定
し、その測定値に応じて供給量をコントロールする。
[0006] (1) As shown in circulation supply amount Figure 3, provided with SO 2 concentration meter 30 for measuring the concentration of SO 2 in the flue gas inlet of the SO 2 absorber 22,
The supply amount is controlled so that the SO 2 concentration in the waste gas will always be about 100 ppm or less. Based on the technique disclosed in JP-A-3-181315,
The combustion exhaust gas supplied to the SO 2 absorption tower 22 is diluted with an inert gas, the concentration of SO 2 in the diluted combustion exhaust gas is measured, and the supply amount is controlled according to the measured value.

【0007】(2)Ca濃度 図3に示すように、循環槽23にpH計31を設け、p
Hが常に5〜6になるように、循環槽23に追加供給す
る石灰乳の量をコントロールする。
(2) Ca Concentration As shown in FIG.
The amount of lime milk additionally supplied to the circulation tank 23 is controlled so that H is always 5 to 6.

【0008】[0008]

【発明が解決しようとする課題】しかしながら、上述し
た従来の石灰乳供給量のコントロールには、次のような
問題点があった。
However, the above-mentioned conventional control of the amount of lime milk supplied has the following problems.

【0009】(1)SO2濃度計 廃ガス中のSO2濃度をSO2吸収塔の廃ガス出口で測
定するため、制御に遅れが生じ、管理が非常に難しい。 特開平3−181315に開示された技術に開示され
た技術では、SO2濃度計がSO2ガスで腐食されやす
く、結果として信頼性に欠ける。
(1) SO 2 Concentration Meter Since the SO 2 concentration in the waste gas is measured at the waste gas outlet of the SO 2 absorption tower, control is delayed and management is very difficult. In the technique disclosed in the technique disclosed in JP-A-3-181315, the SO 2 concentration meter is easily corroded by SO 2 gas, resulting in lack of reliability.

【0010】(2)pH計 石灰乳が追加供給されてから吸収液のpHが変わる迄に
時間がかかるので、pHの変動幅が大きく制御不能にな
りやすい。また、pH計にスケールが付着するので、メ
ンテナンスに要する労力が大きいく、精度にも問題があ
る。
(2) pH meter Since it takes time for the pH of the absorbing solution to change after additional supply of lime milk, the pH fluctuation range is large and control is apt to occur. Further, since the scale adheres to the pH meter, the labor required for maintenance is large and there is a problem in accuracy.

【0011】この発明は、従来技術の上述したような問
題点を解消するためになされたものであり、SO2吸収
塔に供給するSO2ガスの供給量に適応した量の石灰乳
の吸収液を供給することができ、良質の石膏を得ること
のできる石膏の製造方法を提供することを目的としてい
る。
[0011] The present invention has been made to solve the above-described problems of the prior art, absorption liquid lime milk amount adapted to the supply amount of SO 2 gas supplied to the SO 2 absorption tower It is an object of the present invention to provide a method for producing gypsum, which can supply high-quality gypsum.

【0012】[0012]

【課題を解決するための手段】この発明に係る石膏の製
造方法は、コークス炉ガスを吸収液中を通過させ、コー
クス炉ガス中に含まれるH2Sを吸収液中に吸収させて
硫黄スラリーとして回収し、これを燃焼させてSO2
スを発生させ、このSO2ガスを石灰乳に吸収させてC
aSO3とした後、酸化させてCaSO4とし、これを水
和させて石膏を製造する石膏の製造方法において、比重
計で測定した硫黄スラリーの密度から硫黄スラリーの固
体濃度とスラリー液中の硫黄含有量を推定し、この推定
値から石膏製造に供給する単位当りの硫黄供給量を求
め、この単位時間当りの硫黄供給量に適応した単位時間
当りの量の石灰乳を供給するものである。
In the method for producing gypsum according to the present invention, a coke oven gas is passed through an absorbing solution to absorb H 2 S contained in the coke oven gas into the absorbing solution to form a sulfur slurry. collected, it is burned it to generate SO 2 gas, by absorbing the SO 2 gas to the milk of lime C as
In the method for producing gypsum, which comprises oxidizing aSO 3 and then oxidizing it to CaSO 4 to hydrate it to obtain gypsum, in the method for producing gypsum, the solid concentration of the sulfur slurry and the sulfur in the slurry liquid are determined from the density of the sulfur slurry measured by a hydrometer. The content is estimated, the sulfur supply amount per unit supplied to the gypsum production is obtained from this estimated value, and the amount of lime milk per unit time adapted to the sulfur supply amount per unit time is supplied.

【0013】[0013]

【作用】この発明に係る石膏の製造方法においては、石
膏の製造に供給する単位時間当りの硫黄(S)の供給量
を、硫黄スラリーの密度を測定することにより、正確に
推定する。そして、この推定した硫黄の単位時間当りの
供給量を基に、SO2ガスを吸収するに最適な石灰乳の
単位時間当りの供給量を決定するようにしている。この
ようにして、石膏を製造するようにしているので、石灰
乳が削減できるとともに、石膏の品質が安定する。
In the method for producing gypsum according to the present invention, the amount of sulfur (S) supplied per unit time for producing gypsum is accurately estimated by measuring the density of the sulfur slurry. Then, based on the estimated supply amount of sulfur per unit time, the optimum supply amount of lime milk per unit time for absorbing SO 2 gas is determined. Since gypsum is produced in this manner, lime milk can be reduced and the quality of gypsum can be stabilized.

【0014】[0014]

【実施例】本発明の1実施例の石膏の製造方法を図1に
基づき説明する。図1は、本発明の1実施例の石膏の製
造方法により石膏を製造する際の製造工程図であるが、
燃焼炉21以降は従来の製造工程図と変わらないので、
図の符号は前述した従来の製造工程図で使用したものと
した。本発明の1実施例の石膏の製造方法においては、
硫黄スラリーを燃焼炉21に供給する硫黄スラリー槽1
と燃焼炉21とを結ぶ配管2の途中に硫黄スラリーの密
度を測定する比重計3を設け、ポンプ4で送られてくる
硫黄スラリーの密度を測定する。
EXAMPLE A method for producing gypsum according to an example of the present invention will be described with reference to FIG. FIG. 1 is a manufacturing process diagram for manufacturing gypsum by the method for manufacturing gypsum according to one embodiment of the present invention.
Since the combustion furnace 21 and later are the same as the conventional manufacturing process diagram,
The reference numerals used in the drawings are those used in the above-described conventional manufacturing process drawings. In the method for producing plaster of one embodiment of the present invention,
Sulfur slurry tank 1 for supplying the sulfur slurry to the combustion furnace 21
A density meter 3 for measuring the density of the sulfur slurry is provided in the middle of a pipe 2 that connects the combustion furnace 21 with the combustion furnace 21, and the density of the sulfur slurry sent by a pump 4 is measured.

【0015】硫黄スラリーの密度と硫黄スラリー中の固
体濃度との間には、図2のグラフのような相関があるの
で、密度から固体濃度は容易に推定できる。そして、固
体中に含まれる硫黄の含有率は0.9〜0.95、また
硫黄スラリー液中の硫黄含有率は8〜10%であること
が知られているので、単位時間当りの硫黄供給量は、
(1)〜(3)式により求めることができる。なお、硫
黄スラリーの供給量は既存の流量計により測定すればよ
い。
Since there is a correlation as shown in the graph of FIG. 2 between the density of the sulfur slurry and the solid concentration in the sulfur slurry, the solid concentration can be easily estimated from the density. It is known that the content of sulfur contained in the solid is 0.9 to 0.95, and the content of sulfur in the sulfur slurry liquid is 8 to 10%. The amount is
It can be obtained by the equations (1) to (3). The amount of sulfur slurry supplied may be measured by an existing flow meter.

【0016】 QS1=x×a×QSLURRY (1) QS2=(ρ×QSLURRY−x×QSLURRY)×a =(ρ−x)×QSLURRY×b (2) QS =QS1+QS2 (3) ただし、 QS1:単位時間当りに供給される硫黄スラリーの固体中
の硫黄含有量(g/Hr) X:硫黄スラリーの固体濃度(g/l) a:硫黄スラリーの固体中の硫黄含有率(0.9〜0.
95) QSLURRY:硫黄スラリーの単位時間当りの供給量(l/
Hr) QS2:単位時間当りに供給される硫黄スラリーの液中の
硫黄含有量(g/Hr) ρ: 硫黄スラリーの密度(g/l) b:硫黄スラリーの液中の硫黄含有率(0.08〜0.
10) QS:単位時間当りに供給される硫黄の総量(g/H
r)
Q S1 = x × a × Q SLURRY (1) Q S2 = (ρ × Q SLURRY −x × Q SLURRY ) × a = (ρ−x) × Q SLURRY × b (2) Q S = Q S1 + Q S2 (3) However, Q S1 : Sulfur content in solid of sulfur slurry supplied per unit time (g / Hr) X: Solid concentration of sulfur slurry (g / l) a: In solid of sulfur slurry Sulfur content (0.9-0.
95) Q SLURRY : Supply amount of sulfur slurry per unit time (l /
Hr) Q S2 : Sulfur content in the liquid of the sulfur slurry supplied per unit time (g / Hr) ρ: Density of the sulfur slurry (g / l) b: Sulfur content in the liquid of the sulfur slurry (0 .08-0.
10) Q S : Total amount of sulfur supplied per unit time (g / H
r)

【0017】このようにして求まる量の硫黄が燃焼さ
れ、SO2ガスとなって石灰乳中のCa(OH)2(水酸
化カルシューム)と反応してCaSO3が生成されるの
であるが、化1および化2の反応式のように、硫黄
(S)1モルからSO21モルが生成され、SO21モル
とCa(OH)21モルとが反応してCaSO31モルが
生成されるという関係から、前に求めた硫黄の総量QS
をもとに、必要な石灰乳の量は(4)式により求めるこ
とができる。
The amount of sulfur thus obtained is burned and becomes SO 2 gas, which reacts with Ca (OH) 2 (calcium hydroxide) in lime milk to produce CaSO 3 . as shown in reaction formula 1 and formula 2, sulfur (S) 1 mol sO 2 1 mol is generated from, CaSO 3 1 mol is generated sO 2 1 mol of Ca (OH) 2 1 mol are reacted with Therefore, the total amount of sulfur found earlier, Q S
Based on the above, the required amount of lime milk can be obtained by the equation (4).

【0018】[0018]

【化1】 [Chemical 1]

【0019】[0019]

【化2】 [Chemical 2]

【0020】 Q=QS×74(Ca(OH)2の分子量)/32(Sの分子量)/c/d (4) ただし、Q:単位時間当りの石灰乳の必要量(l/H
r) c:石灰乳中の固形物濃度(0.15g/l) d:固形物中のCa(OH)2の含有比率(0.90)
Q = Q S × 74 (molecular weight of Ca (OH) 2 ) / 32 (molecular weight of S) / c / d (4) where Q: required amount of lime milk per unit time (l / H
r) c: concentration of solid matter in lime milk (0.15 g / l) d: content ratio of Ca (OH) 2 in solid matter (0.90)

【0021】このように必要な石灰乳の量は、硫黄スラ
リーの単位時間当りの流量および密度を知ることにより
把握できるので、この二つの値を時々刻々演算機に送
り、自動的に石灰乳の供給量を調整することもできる。
Since the amount of lime milk required in this way can be grasped by knowing the flow rate and density of the sulfur slurry per unit time, these two values are sent to the computing machine every moment so that the lime milk can be automatically added. The supply amount can also be adjusted.

【0022】[0022]

【発明の効果】本発明により、石膏の品質が安定すると
ともに、石灰乳の使用量が削減できる。
According to the present invention, the quality of gypsum can be stabilized and the amount of lime milk used can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の1実施例の石膏の製造方法により石膏
を製造する際の製造工程図である。
FIG. 1 is a manufacturing process diagram for manufacturing gypsum by a method for manufacturing gypsum according to an embodiment of the present invention.

【図2】硫黄スラリーの密度と硫黄スラリー中の固体濃
度との関係を示すグラフである。
FIG. 2 is a graph showing the relationship between the density of the sulfur slurry and the solid concentration in the sulfur slurry.

【図3】従来の石膏製造工程を示す工程図である。FIG. 3 is a process diagram showing a conventional gypsum manufacturing process.

【符号の説明】[Explanation of symbols]

1 硫黄スラリー槽 2 配管 3 比重計 4 ポンプ 1 Sulfur slurry tank 2 Piping 3 Specific gravity meter 4 Pump

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 コークス炉ガスを吸収液中を通過させ、
コークス炉ガス中に含まれるH2Sを吸収液中に吸収さ
せて硫黄スラリーとして回収し、これを燃焼させてSO
2ガスを発生させ、このSO2ガスを石灰乳に吸収させて
CaSO3とした後、酸化させてCaSO4とし、これを
水和させて石膏を製造する石膏の製造方法において、比
重計で測定した硫黄スラリーの密度から硫黄スラリーの
固体濃度とスラリー液中の硫黄含有量を推定し、この推
定値から石膏製造に供給する単位時間当りの硫黄供給量
を求め、この単位時間当りの硫黄供給量に適応した単位
時間当りの量の石灰乳を供給することを特徴とする石膏
の製造方法。
1. A coke oven gas is passed through an absorbing liquid,
The H 2 S contained in the coke oven gas is absorbed in the absorbing liquid and recovered as sulfur slurry, which is burned to produce SO 2.
In the method for producing gypsum, in which 2 gases are generated, and this SO 2 gas is absorbed by lime milk to form CaSO 3 , then oxidized to CaSO 4, and hydrated to produce gypsum, measured with a hydrometer The solid concentration of the sulfur slurry and the sulfur content in the slurry liquid are estimated from the density of the sulfur slurry, and the sulfur supply amount per unit time supplied to the gypsum production is calculated from this estimated value, and the sulfur supply amount per unit time is calculated. A method for producing gypsum, characterized in that lime milk is supplied in an amount per unit time adapted to the above.
JP4015667A 1992-01-31 1992-01-31 Production of gypsum Pending JPH05208815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4015667A JPH05208815A (en) 1992-01-31 1992-01-31 Production of gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4015667A JPH05208815A (en) 1992-01-31 1992-01-31 Production of gypsum

Publications (1)

Publication Number Publication Date
JPH05208815A true JPH05208815A (en) 1993-08-20

Family

ID=11895095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4015667A Pending JPH05208815A (en) 1992-01-31 1992-01-31 Production of gypsum

Country Status (1)

Country Link
JP (1) JPH05208815A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781589A1 (en) * 1995-12-28 1997-07-02 The Kansai Electric Power Co., Inc. Method of producing gypsum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781589A1 (en) * 1995-12-28 1997-07-02 The Kansai Electric Power Co., Inc. Method of producing gypsum
US5798087A (en) * 1995-12-28 1998-08-25 Kansai Electric Power Co., Inc. Method of producing gypsum

Similar Documents

Publication Publication Date Title
US4337230A (en) Method of absorbing sulfur oxides from flue gases in seawater
CN109092045B (en) Limestone-gypsum method flue gas desulfurization slurry oxidation control method
EP3842125A1 (en) Automatic ammonia-adding system and method for ammonia-based desulfurization device
WO2014041980A1 (en) System for processing exhaust gas, and method for processing exhaust gas
WO2000013770A1 (en) Process for controlling ammonia slip in the reduction of sulfur dioxide emission
JP3573950B2 (en) Exhaust gas desulfurization method
JP3751340B2 (en) Exhaust gas desulfurization method
CN105561753A (en) Novel dry process cement kiln flue gas online desulfurization device and technology
WO1996014137A1 (en) Forced oxidation system for a flue gas scrubbing apparatus
GB2135455A (en) Continuous determination of a carbonate and sulfite
JPH05208815A (en) Production of gypsum
CN112316682A (en) Ammonia desulphurization method and equipment with accurate ammonia addition
JP3748861B2 (en) Exhaust gas desulfurization method by metathesis method
JP3089209B2 (en) Corrosion prevention method for flue gas treatment equipment
JP2883365B2 (en) Control device for wet flue gas desulfurization unit
JP3692219B2 (en) Smoke exhaust treatment method and smoke exhaust treatment apparatus
JP3504427B2 (en) Exhaust gas desulfurization method
JP2510583B2 (en) Exhaust gas treatment device
JP2740537B2 (en) Cooling tower drainage control device for desulfurization equipment
JPH03137918A (en) Supply amount control apparatus of oxidizing air for wet waste desulfurization equipment
CN114073887B (en) Optimization and control method for water balance of limestone-wet desulfurization system
JP2971512B2 (en) Control method for wet flue gas desulfurization unit
JP3704181B2 (en) Exhaust gas desulfurization method
JP3728000B2 (en) Exhaust gas desulfurization method
JP3494814B2 (en) Method and apparatus for measuring calcium carbonate concentration in slurry