JPH1085549A - Wet exhaust gas desulfurization device and exhaust gas desulfutization - Google Patents
Wet exhaust gas desulfurization device and exhaust gas desulfutizationInfo
- Publication number
- JPH1085549A JPH1085549A JP8247759A JP24775996A JPH1085549A JP H1085549 A JPH1085549 A JP H1085549A JP 8247759 A JP8247759 A JP 8247759A JP 24775996 A JP24775996 A JP 24775996A JP H1085549 A JPH1085549 A JP H1085549A
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- JP
- Japan
- Prior art keywords
- absorbent
- exhaust gas
- circulation tank
- concentration
- value
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、湿式排ガス脱硫装
置に係わり、特にＳＯｘ、酸性ガスおよび燃料中の金属
成分を含むばいじんからなるボイラ等の燃焼排ガスを効
率良く脱硫すると共に、排ガス脱硫装置から回収される
副生物の純度を保つのに好適で、吸収剤やアルカリ剤の
ユーティリティを低減するのに好適な湿式排ガス脱硫装
置と方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet exhaust gas desulfurization apparatus, and more particularly to a method for efficiently desulfurizing combustion exhaust gas from a boiler or the like comprising SOx, acid gas, and dust containing metal components in fuel. The present invention relates to a wet exhaust gas desulfurization apparatus and method suitable for maintaining the purity of by-products recovered and suitable for reducing the utility of an absorbent or an alkaline agent.
【０００２】[0002]
【従来の技術】従来の湿式排ガス脱硫装置の系統を図
３、図４に示す。図３において、ボイラ等からの排ガス
１は入口煙道３から吸収塔４に導入され、吸収塔４内に
設置されたスプレ段８を介して、該スプレ段８に設置さ
れたスプレノズルより噴霧される吸収液の液滴と接触す
ることにより、排ガス１中のばいじんや塩化水素（ＨＣ
ｌ）、フッ化水素（ＨＦ）等の酸性ガスとともに、排ガ
ス１中のＳＯ2が液滴に吸収される。2. Description of the Related Art A conventional wet exhaust gas desulfurization system is shown in FIGS. In FIG. 3, exhaust gas 1 from a boiler or the like is introduced into an absorption tower 4 from an inlet flue 3, and is sprayed from a spray nozzle installed in the spray stage 8 through a spray stage 8 installed in the absorption tower 4. Contact with the liquid droplets of the absorbing liquid, soot and hydrogen chloride (HC)
l), SO 2 in the exhaust gas 1 is absorbed by the droplets together with an acidic gas such as hydrogen fluoride (HF).
【０００３】ガスに同伴されるミストは、後流側のミス
トエリミネータ５により除去され、清浄な排ガス２は出
口煙道６を経て、必要により再加熱されて煙突より排出
される。The mist entrained by the gas is removed by a mist eliminator 5 on the downstream side, and the clean exhaust gas 2 is reheated as required through an outlet flue 6 and discharged from a chimney.
【０００４】この時の処理ガス量は処理ガス流量計４５
で、吸収塔４の入口排ガス１中のＳＯ2濃度は入口ＳＯ2
計４１で、吸収塔４の出口排ガス２中のＳＯ2濃度は出
口ＳＯ2計４２でそれぞれ測定される。At this time, the amount of the processing gas is measured by a processing gas flow meter 45.
In, SO 2 concentration of the inlet gas in the first absorption column 4 the inlet SO 2
In the total 41, the SO 2 concentration in the exhaust gas 2 at the outlet of the absorption tower 4 is measured by the outlet SO 2 total 42.
【０００５】ＳＯ2の吸収剤である石灰石１６は、石灰
石スラリ槽１５から石灰石スラリポンプ１７により抜き
出され、石灰石スラリ流量調整弁１８によりＳＯ2吸収
量に応じて、吸収塔４内に吸収液である石灰石スラリと
して供給される。吸収塔４下部の循環タンク４’内の吸
収液は、吸収塔循環ポンプ７により抜き出されて昇圧さ
れ、吸収塔内のスプレノズルが配置されたスプレ段８に
供給される。Limestone 16, which is an SO 2 absorbent, is extracted from a limestone slurry tank 15 by a limestone slurry pump 17, and the limestone slurry is supplied to the absorption tower 4 by a limestone slurry flow control valve 18 in accordance with the SO 2 absorption amount. Supplied as a limestone slurry. The absorption liquid in the circulation tank 4 'at the lower part of the absorption tower 4 is withdrawn by the absorption tower circulation pump 7 and pressurized, and supplied to the spray stage 8 in the absorption tower where the spray nozzle is arranged.
【０００６】吸収塔４内で除去されたＳＯ2は、吸収液
中のカルシウムと反応し、中間生成物として重亜硫酸カ
ルシウムを含む亜硫酸カルシウムになり、酸化用空気ブ
ロワ２１から循環タンク４’内に供給される空気によっ
て酸化されて、最終生成物である石膏になる。[0006] The SO 2 removed in the absorption tower 4 reacts with calcium in the absorbing solution to become calcium sulfite containing calcium bisulfite as an intermediate product, and is transferred from the oxidizing air blower 21 to the circulation tank 4 ′. It is oxidized by the supplied air into gypsum, which is the end product.
【０００７】前記酸化用空気は、循環タンク４’内の酸
化用撹拌機２６により微細化されて供給されることによ
り、酸化用空気の利用率が高められている。The oxidizing air is finely supplied by the oxidizing stirrer 26 in the circulation tank 4 ', so that the utilization rate of the oxidizing air is increased.
【０００８】その後、循環タンク４’内の吸収液は、抜
き出しポンプ９により生成した石膏量に応じて抜き出さ
れるが、その一部はｐＨ計タンク３０に送られ、該タン
ク３０に設置されたｐＨ計３１により循環タンク４’内
の吸収液のｐＨが測定される。After that, the absorbent in the circulation tank 4 'is withdrawn by the withdrawal pump 9 in accordance with the amount of gypsum generated. A part of the liquid is sent to the pH meter tank 30 and installed in the tank 30. The pH of the absorbing solution in the circulation tank 4 'is measured by the pH meter 31.
【０００９】また、図４に示すように吸収剤濃度計３２
を設けることにより、吸収液中の吸収剤濃度の測定が行
われる場合もある。Further, as shown in FIG.
In some cases, the measurement of the concentration of the absorbent in the absorbing liquid is performed.
【００１０】一方、ｐＨ計タンク３０に送られる吸収液
以外の吸収液は、石膏脱水設備１０に送られて脱水され
た後、必要に応じて石膏中の可溶性の不純物を除去する
ために洗浄され、粉体の石膏１１として回収される。On the other hand, the absorbing liquid other than the absorbing liquid sent to the pH meter tank 30 is sent to the gypsum dewatering equipment 10 to be dehydrated, and then, if necessary, washed to remove soluble impurities in the gypsum. , And collected as powder gypsum 11.
【００１１】なお、回収される石膏の純度を決定する因
子は、生成石膏量、吸収塔での捕集ばいじん量、吸収塔
で除去されるＨＦと吸収剤との反応により生じるＣａＦ
2等の固形物量、未反応の吸収剤中の不純物量、吸収塔
内での酸化が不十分である場合に残る亜硫酸カルシウム
量、石膏洗浄が行われない場合の石膏付着水中の可溶性
成分量および排水処理汚泥等の外部からの添加物量等で
あり、回収される石膏の商品価値を落とさないために、
引き取り条件以上の石膏純度に保つ必要がある。The factors that determine the purity of the recovered gypsum are the amount of gypsum produced, the amount of collected dust in the absorption tower, and the amount of CaF generated by the reaction between the HF removed in the absorption tower and the absorbent.
2 solids amount, the amount of impurities in the unreacted absorbent, the amount of calcium sulfite remaining when oxidation in the absorption tower is insufficient, the amount of soluble components in gypsum-adhered water when gypsum washing is not performed, and It is the amount of external additives such as wastewater treatment sludge, etc., in order to keep the commercial value of the recovered gypsum,
It is necessary to keep the gypsum purity higher than the pickup condition.
【００１２】なお、分離された水１２は石灰石スラリ槽
１５等の補給水１３として系内で再利用されるが、その
一部は塩素等の濃縮を防ぐために排水１４として抜き出
されて排水処理設備５０に送られる。The separated water 12 is reused in the system as make-up water 13 for a limestone slurry tank 15 and the like, but a part of the water 12 is extracted as waste water 14 to prevent concentration of chlorine and the like, and the waste water is treated. It is sent to the facility 50.
【００１３】このような従来技術の湿式排ガス脱硫装置
において、脱硫性能に影響する因子として以下の３項目
があげられる。 （１）吸収塔入口の排ガス流量およびＳＯ2濃度 （２）吸収塔液ガス比（Ｌ／Ｇ） （３）吸収液ｐＨまたは吸収液の吸収剤濃度。In such a conventional wet exhaust gas desulfurization apparatus, the following three items are mentioned as factors affecting the desulfurization performance. (1) Exhaust gas flow rate and SO 2 concentration at the inlet of the absorption tower (2) Absorption tower liquid gas ratio (L / G) (3) Absorbent pH or absorbent concentration of the absorbent.
【００１４】例えば、上記（１）〜（３）の中で他の２
条件が同一なら（１）入口排ガス流量およびＳＯ2濃度
が高い場合、（２）Ｌ／Ｇが低い場合または（３）吸収
液ｐＨが低い場合または吸収剤が不足する場合にそれぞ
れ脱硫率が低下する。For example, in the above (1) to (3), the other two
If the conditions are the same, the desulfurization rate decreases when (1) the inlet exhaust gas flow rate and SO 2 concentration are high, (2) the L / G is low, or (3) the pH of the absorbent is low or the amount of the absorbent is insufficient. I do.
【００１５】したがって、高い脱硫性能を得る方法とし
ては、（１）の入口ＳＯ2濃度や排ガス流量は脱硫装置
側では制御できないので、（２）または（３）に着目し
た方法が用いられる。例えば（２）に着目した方法とし
ては吸収塔循環ポンプ７の運転台数を変化させたり、吐
出量が可変のものを用いることにより、Ｌ／Ｇを制御す
ることができる。Therefore, as a method for obtaining high desulfurization performance, the method focusing on (2) or (3) is used because the inlet SO 2 concentration and the exhaust gas flow rate in (1) cannot be controlled on the desulfurization apparatus side. For example, as a method focusing on (2), L / G can be controlled by changing the number of operating absorption tower circulating pumps 7 or using a pump having a variable discharge amount.
【００１６】また（３）に着目した方法として、例えば
図３に示すように、吸収塔４に供給する吸収液供給量を
吸収液ｐＨ計３１からの信号を指標として、石灰石スラ
リ流量調整弁１８を調整することにより、吸収液ｐＨが
所定のｐＨになるように制御したり、図４に示すよう
に、循環タンク４’内の吸収剤濃度を測定する吸収剤濃
度計３２からの信号を指標として、石灰石スラリ流量調
整弁１８を調整することにより、吸収液中の吸収剤濃度
が一定となるように制御装置４３で制御していた。As a method focusing on (3), for example, as shown in FIG. 3, the supply amount of the absorbing liquid supplied to the absorbing tower 4 is determined by using a signal from the absorbing liquid pH meter 31 as an index, and the limestone slurry flow rate adjusting valve 18 is used. Is adjusted to adjust the pH of the absorbent to a predetermined pH, and as shown in FIG. 4, the signal from the absorbent concentration meter 32 for measuring the concentration of the absorbent in the circulation tank 4 'is used as an index. By controlling the limestone slurry flow control valve 18, the controller 43 controls the concentration of the absorbent in the absorbent to be constant.
【００１７】[0017]
【発明が解決しようとする課題】しかしながら前記従来
技術では、石炭の種類によって影響の度合いは異なる
が、運転中に循環タンク４’内の吸収液ｐＨが比較的に
短時間で低下し、目標とする脱硫性能が発揮できないと
いう問題があった。この原因としては、排ガス１から除
去されたばいじん中の成分（特にアルミニウム）と排ガ
ス１から吸収されたフッ素とが反応して、吸収剤の表面
に難溶性の化合物であるアパタイトが生成することによ
って、いわゆる吸収剤の活性の低下が生じるためと考え
られている。このような場合に脱硫性能を維持するため
には次のような問題があった。However, in the above prior art, although the degree of the effect varies depending on the type of coal, the pH of the absorbing solution in the circulation tank 4 'decreases in a relatively short time during operation, and the However, there is a problem that desulfurization performance cannot be exhibited. This is because the components (particularly aluminum) in the dust removed from the exhaust gas 1 react with the fluorine absorbed from the exhaust gas 1 to form apatite which is a hardly soluble compound on the surface of the absorbent. It is considered that the activity of the absorbent decreases. In such a case, there are the following problems to maintain the desulfurization performance.
【００１８】すなわち、循環タンク内の吸収液の吸収剤
の活性が低下したときには、吸収液のｐＨが比較的短時
間に低下し、脱硫性能を維持できなくなるため、脱硫に
寄与する吸収液の供給量を増加する必要があるが、この
場合に、吸収液の供給量を循環タンク内の吸収液ｐＨだ
けで制御する場合は、ｐＨの回復に時間遅れが生じるの
で、これを防ぎ、ｐＨを急速に回復するために通常状態
よりも過剰に吸収液が供給されることになる。この吸収
循環タンク内に過剰に供給された吸収液中には未反応の
吸収剤が残り、回収される石膏純度が低下するという問
題があった。That is, when the activity of the absorbent in the absorbent in the circulation tank decreases, the pH of the absorbent decreases in a relatively short time, and the desulfurization performance cannot be maintained. In this case, if the supply amount of the absorbent is controlled only by the pH of the absorbent in the circulation tank, a time delay will occur in the recovery of the pH. In order to recover the pressure, the absorbing liquid is supplied in excess of the normal state. There is a problem that unreacted absorbent remains in the absorbent liquid supplied excessively in the absorption circulation tank, and the purity of the recovered gypsum decreases.
【００１９】また、吸収液の供給量を吸収剤濃度計によ
って測定された循環タンク内の吸収液の吸収剤濃度で直
接に制御する場合は、吸収剤濃度測定値には活性が低下
した吸収剤の濃度も含まれるため、吸収剤濃度を維持し
ようとすると実際には循環タンク内の吸収液のｐＨが低
下しており、脱硫性能が低下するという問題があった。When the supply amount of the absorbing solution is directly controlled by the absorbing agent concentration of the absorbing solution in the circulation tank measured by the absorbing agent concentration meter, the measured value of the absorbing agent concentration indicates the absorbent whose activity has decreased. Therefore, when the concentration of the absorbent is to be maintained, the pH of the absorbent in the circulation tank is actually lowered, and there is a problem that the desulfurization performance is lowered.
【００２０】また、前記のような吸収液の吸収剤の活性
低下によるｐＨ低下を早期に回復するため、循環タンク
下部に吸収液と共に、ＮａＯＨ等の可溶性アルカリ剤を
供給する方法も用いられている。例えば、特公平７−１
１４９１８（特開昭６２−２４４４２６）号公報記載の
方法は、循環タンク４’下部に吸収液およびアルカリ剤
を供給することにより循環タンク４’内の吸収液ｐＨを
４．５以上に回復することが開示されている。Further, in order to recover the pH decrease due to the decrease in the activity of the absorbent in the absorbent as described above, a method of supplying a soluble alkaline agent such as NaOH together with the absorbent to the lower part of the circulation tank is also used. . For example, Tokiko 7-1
No. 14918 (Japanese Patent Application Laid-Open No. 62-244426) discloses a method of recovering the pH of the absorbent in the circulation tank 4 'to 4.5 or more by supplying an absorbent and an alkaline agent to the lower part of the circulation tank 4'. Is disclosed.
【００２１】前記アルカリ剤は、吸収液と共に循環タン
ク４’に供給されて、循環タンク４’内の吸収液に溶解
することで、酸化によって低下している吸収液のｐＨを
回復すると共に、新たに吸収剤の表面に難溶性化合物で
あるアパタイトが生成して、吸収剤の活性が低下し、脱
硫に寄与しなくなるのを防止する。しかしながら、活性
が低下した吸収剤に対しては、アルカリ剤を供給しても
吸収剤の活性は低下したままであり全く脱硫には寄与し
ない。The alkaline agent is supplied to the circulating tank 4 'together with the absorbing solution and dissolved in the absorbing solution in the circulating tank 4', thereby recovering the pH of the absorbing solution which has been lowered by oxidation and renewing the pH. This prevents apatite, which is a hardly soluble compound, from being generated on the surface of the absorbent, which reduces the activity of the absorbent and does not contribute to desulfurization. However, for an absorbent whose activity has been reduced, the activity of the absorbent remains reduced even if an alkaline agent is supplied, and does not contribute to desulfurization at all.
【００２２】また、吸収塔入口の排ガス量およびＳＯｘ
濃度などの排ガス条件によって、吸収液の最適ｐＨ値が
異なり、排ガス条件が低ＳＯｘ濃度の場合には比較的低
いｐＨ値、高ＳＯｘ濃度の場合には比較的高いｐＨ値が
それぞれ最適ｐＨ値となる。The exhaust gas amount at the inlet of the absorption tower and the SOx
The optimum pH value of the absorbing solution varies depending on the exhaust gas conditions such as concentration, and when the exhaust gas conditions are low SOx concentration, the relatively low pH value, and when the exhaust gas condition is high SOx concentration, the relatively high pH value is the optimum pH value. Become.
【００２３】したがって、前記の方法によって吸収液ｐ
Ｈを常に所定の値以上に維持するような運用を行う場合
には、低ＳＯｘ濃度の排ガスの脱硫時には、過剰なアル
カリ剤および吸収剤を供給することになり不経済であ
る。また、高ＳＯｘ濃度の排ガスの脱硫時には、アルカ
リ剤供給量に余裕がなく、急な活性低下に伴うｐＨ低下
が短時間に行った場合には、その回復が追いつかないと
いう問題があった。Therefore, the absorbent p
If an operation is performed such that H is always maintained at a predetermined value or more, excessive desalination of exhaust gas with a low SOx concentration leads to supply of excess alkali agent and absorbent, which is uneconomical. In addition, when desulfurizing exhaust gas with a high SOx concentration, there is no margin in the supply amount of the alkali agent, and there is a problem that the recovery cannot catch up if the pH is decreased in a short time due to a sudden decrease in the activity.
【００２４】本発明の課題は、吸収液の活性低下を常に
監視し、活性の低下時に脱硫率の低下を防止すると共
に、吸収剤が規定値以上に供給されることによる回収石
膏の純度の低下を防止すること、および吸収塔に供給す
るアルカリ剤量を最適量にし、ユーティリティの低減を
行うことにある。An object of the present invention is to constantly monitor the decrease in the activity of the absorbent, prevent the desulfurization rate from decreasing when the activity decreases, and reduce the purity of the recovered gypsum due to the supply of the absorbent at or above the specified value. And reducing the utility by optimizing the amount of alkaline agent supplied to the absorption tower.
【００２５】[0025]
【課題を解決するための手段】本発明の上記課題は次の
構成で解決される。すなわち、硫黄酸化物、酸性ガス
および燃料中の金属成分を含むばいじんからなる燃焼排
ガスを吸収塔に導入して、カルシウム系吸収剤を含む吸
収液と接触させて、排ガス中の硫黄酸化物を吸収液中に
吸収させた後、排ガス中の硫黄酸化物を吸収した吸収液
が滞留する循環タンク内の吸収液中に空気を供給し、吸
収液の一部を再び排ガスと接触させるとともに、その他
の一部を石膏回収系に抜き出し、さらに前記カルシウム
系吸収剤を含む吸収液およびアルカリ剤を循環タンク内
の吸収液中に供給する手段を有する湿式排ガス脱硫装置
において、吸収液中の吸収剤濃度のうち不活性な吸収剤
の割合に応じて、吸収塔に供給する前記アルカリ剤の供
給量を調整する制御装置を設けた湿式排ガス脱硫装置、
または、The above object of the present invention is attained by the following constitution. That is, a flue gas consisting of sulfur oxides, acid gas and soot containing metal components in fuel is introduced into an absorption tower, and brought into contact with an absorbent containing a calcium-based absorbent to absorb sulfur oxides in the exhaust gas. After being absorbed in the liquid, air is supplied to the absorbent in the circulation tank in which the absorbent absorbing the sulfur oxides in the exhaust gas stays, and a part of the absorbent is brought into contact with the exhaust gas again, In a wet exhaust gas desulfurization device having a means for withdrawing a part of the gypsum recovery system and further supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the concentration of the absorbent in the absorbent is measured. A wet exhaust gas desulfurization apparatus provided with a control device for adjusting the supply amount of the alkaline agent supplied to the absorption tower according to the ratio of the inert absorbent,
Or
【００２６】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、吸収
塔入口の排ガス量、硫黄酸化物濃度、循環タンク内の吸
収液のｐＨ値および吸収剤濃度をそれぞれ検出する手段
と、循環タンク内に供給する吸収液を調整する調整手段
と、循環タンク内に供給するアルカリ剤の供給量を調整
する調整手段とを設け、検出排ガス量と検出硫黄酸化物
濃度、予め設定される要求脱硫率および検出ｐＨ値と予
め設定されるｐＨ値との偏差に基づき、前記吸収液の供
給量の調整手段を調整すると共に、検出吸収剤濃度が、
予め設定される循環タンク内の吸収剤濃度となるよう
に、前記アルカリ剤の供給量の調整手段を調整する制御
装置を設けた湿式排ガス脱硫装置、または、A combustion exhaust gas consisting of sulfur oxides, sour gas and soot containing metal components in the fuel is introduced into an absorption tower, and brought into contact with an absorbing solution containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, Providing means for detecting the pH value and the absorbent concentration of the absorbing solution, adjusting means for adjusting the absorbing solution supplied to the circulation tank, and adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank Based on the detected exhaust gas amount and the detected sulfur oxide concentration, a predetermined required desulfurization rate and a deviation between the detected pH value and a predetermined pH value, and adjusts the supply amount of the absorbing liquid. While integer, it is detected absorbent concentration,
Wet exhaust gas desulfurization device provided with a control device that adjusts the adjusting means of the supply amount of the alkaline agent so that the absorbent concentration in the circulation tank is set in advance, or
【００２７】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、吸収
塔入口の排ガス量、硫黄酸化物濃度、循環タンク内の吸
収液のｐＨ値および吸収剤濃度をそれぞれ検出する手段
と、循環タンク内に供給する吸収液を調整する調整手段
と、循環タンク内に供給するアルカリ剤の供給量を調整
する調整手段とを設け、検出排ガス量と検出硫黄酸化物
濃度、予め設定される要求脱硫率、循環タンク内の吸収
剤過剰率および検出ｐＨ値と予め設定されるｐＨ値との
偏差に基づき、前記吸収液の供給量の調整手段を調整す
ると共に、検出吸収剤濃度と予め設定される循環タンク
内の吸収剤濃度との偏差に基づき、検出吸収剤濃度が予
め設定される循環タンク内の吸収剤過剰率に相当する濃
度となるように、前記アルカリ剤の供給量の調整手段を
調整調整する制御装置を設けた湿式排ガス脱硫装置、ま
たは、A combustion exhaust gas comprising sulfur oxides, an acid gas and soot containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, Providing means for detecting the pH value and the absorbent concentration of the absorbing solution, adjusting means for adjusting the absorbing solution supplied to the circulation tank, and adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank Based on the detected exhaust gas amount and the detected sulfur oxide concentration, the preset required desulfurization rate, the excess amount of the absorbent in the circulation tank, and the deviation between the detected pH value and the preset pH value, In addition to adjusting the adjusting means for the supply amount of the absorbent, the detected absorbent concentration is set in advance based on the deviation between the detected absorbent concentration and the preset absorbent concentration in the circulation tank. Wet exhaust gas desulfurization device provided with a control device that adjusts and adjusts the adjusting means of the supply amount of the alkaline agent so as to have a concentration corresponding to the excess rate, or
【００２８】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、吸収
塔入口の排ガス量、硫黄酸化物濃度、循環タンク内の吸
収液のｐＨ値および吸収剤濃度をそれぞれ検出する手段
と、循環タンク内に供給する吸収液を調整する調整手段
と、循環タンク内に供給するアルカリ剤の供給量を調整
する調整手段とを設け、検出排ガス量と検出硫黄酸化物
濃度、予め設定される要求脱硫率および循環タンク内の
吸収剤過剰率から、排ガス処理に必要な吸収液の必要供
給量の先行値を設定し、該先行値を検出ｐＨ値と予め設
定されるｐＨ値との偏差に基づき補正した補正値となる
ように吸収液の供給量の調整手段を調整すると共に、検
出吸収剤濃度と予め設定される循環タンク内の吸収剤濃
度との偏差に基づき、アルカリ剤の供給量の調整手段
を、検出吸収剤濃度が予め設定される循環タンク内の吸
収剤過剰率に相当する濃度となるように調整する制御装
置を設けた湿式排ガス脱硫装置、または、Combustion exhaust gas comprising sulfur oxides, sour gas and soot containing metal components in fuel is introduced into an absorption tower and brought into contact with an absorbent containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, Providing means for detecting the pH value and the absorbent concentration of the absorbing solution, adjusting means for adjusting the absorbing solution supplied to the circulation tank, and adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank From the detected exhaust gas amount and the detected sulfur oxide concentration, the required desulfurization rate set in advance and the excess amount of the absorbent in the circulation tank, the leading value of the necessary supply amount of the absorbent required for exhaust gas treatment is set. Then, the adjusting means for adjusting the supply amount of the absorbing liquid is adjusted so as to be a correction value obtained by correcting the preceding value based on a deviation between the detected pH value and a preset pH value, and the detected absorbent concentration is set in advance. Based on the deviation from the absorbent concentration in the circulation tank, the adjusting means of the supply amount of the alkaline agent is adjusted so that the detected absorbent concentration becomes a concentration corresponding to a preset excess ratio of the absorbent in the circulation tank. Wet flue gas desulfurization device equipped with a control device to perform, or
【００２９】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫方法において、吸収
液中の吸収剤濃度のうち不活性な吸収剤の割合に応じ
て、吸収塔に供給する前記アルカリ剤の供給量を調整す
ることを特徴とする湿式排ガス脱硫方法、または、[0029] Combustion exhaust gas comprising sulfur oxides, acid gas and soot containing metal components in fuel is introduced into an absorption tower, and brought into contact with an absorbent containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. A wet exhaust gas desulfurization method further comprising a means for supplying an absorbent and an alkali agent containing the calcium-based absorbent into the absorbent in the circulation tank, wherein the ratio of the inert absorbent to the absorbent in the absorbent is According to the wet exhaust gas desulfurization method, characterized in that the supply amount of the alkaline agent to be supplied to the absorption tower, or
【００３０】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、吸収塔入
口の排ガス量と硫黄酸化物濃度と循環タンク内の吸収液
のｐＨ値をそれぞれ検出し、予め設定される要求脱硫率
および前記循環タンク内の吸収液のｐＨ値と予め設定さ
れるｐＨ値との偏差に基づき、吸収液の供給量を調整す
ると共に、検出吸収剤濃度が、予め設定される循環タン
ク内の吸収剤濃度となるように、前記アルカリ剤の供給
量を調整する湿式排ガス脱硫方法、または、Combustion exhaust gas consisting of sulfur oxides, acid gas and soot containing metal components in fuel is introduced into an absorption tower, and brought into contact with an absorbing solution containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method in which the absorbent containing the calcium-based absorbent and the alkaline agent are further supplied into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Detecting the pH value of the liquid, and adjusting the supply amount of the absorption liquid based on a deviation between the predetermined required desulfurization rate and the pH value of the absorption liquid in the circulation tank and the predetermined pH value, Wet exhaust gas desulfurization method for adjusting the supply amount of the alkaline agent, so that the detected absorbent concentration becomes the absorbent concentration in the circulation tank set in advance, or
【００３１】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、吸収塔入
口の排ガス量と硫黄酸化物濃度と循環タンク内の吸収液
のｐＨ値をそれぞれ検出し、予め設定される要求脱硫
率、循環タンク内の吸収剤過剰率および前記循環タンク
内の吸収液のｐＨ値と予め設定されるｐＨ値との偏差に
基づき、吸収液の供給量を調整すると共に、循環タンク
内の吸収剤濃度検出値と予め設定される循環タンク内の
吸収剤濃度との偏差に基づき、検出吸収剤濃度が予め設
定される循環タンク内の吸収剤過剰率に相当する濃度と
なるように循環タンク内へのアルカリ剤の供給量を調整
する湿式排ガス脱硫方法、または、Combustion exhaust gas consisting of sulfur oxides, sour gas and soot containing metal components in fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method in which the absorbent containing the calcium-based absorbent and the alkaline agent are further supplied into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Each of the pH values of the liquids is detected, and based on a predetermined required desulfurization rate, an excess rate of the absorbent in the circulation tank, and a deviation between the pH value of the absorbent in the circulation tank and the predetermined pH value, A circulation tank in which the amount of liquid supplied is adjusted and the detected absorbent concentration is preset based on a deviation between the detected value of the absorbent concentration in the circulation tank and the preset absorbent concentration in the circulation tank. Wet flue gas desulfurization process for adjusting the supply amount of the alkali agent to the absorbent corresponding to excess concentration so as to circulate the tank, or
【００３２】硫黄酸化物、酸性ガスおよび燃料中の金
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、吸収塔入
口の排ガス量と硫黄酸化物濃度と循環タンク内の吸収液
のｐＨ値をそれぞれ検出し、予め設定される要求脱硫
率、循環タンク内の吸収剤過剰率から、排ガス処理に必
要な吸収液の必要供給量の先行値を設定し、該先行値を
ｐＨ検出値と予め設定されるｐＨ値との偏差に基づき補
正した補正値となるように吸収液の循環タンクへの供給
量を調整すると共に、吸収剤検出濃度と予め設定される
循環タンク内の吸収剤濃度との偏差に基づき、循環タン
ク内へのアルカリ剤の供給量を調整し、検出吸収剤濃度
が予め設定される循環タンク内の吸収剤過剰率に相当す
る濃度となるように調整する湿式排ガス脱硫方法であ
る。Combustion exhaust gas comprising sulfur oxides, sour gas and soot containing metal components in the fuel is introduced into an absorption tower, and brought into contact with an absorbing solution containing a calcium-based absorbent to remove sulfur oxides in the exhaust gas. After being absorbed in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method in which the absorbent containing the calcium-based absorbent and the alkaline agent are further supplied into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Each of the pH values of the liquids is detected, and from the required desulfurization rate set in advance and the excess amount of the absorbent in the circulation tank, a leading value of the necessary supply amount of the absorbing liquid required for the exhaust gas treatment is set, and the leading value is set to pH. The supply amount of the absorbent to the circulation tank is adjusted so as to be a correction value corrected based on the deviation between the detected value and the preset pH value, and the absorbent detection concentration and the absorption in the preset circulation tank are adjusted. Wet exhaust gas that adjusts the supply amount of the alkaline agent into the circulation tank based on the deviation from the concentration, and adjusts the detected absorbent concentration to be a concentration corresponding to a preset excess ratio of the absorbent in the circulation tank. It is a desulfurization method.
【００３３】[0033]
【作用】吸収塔に供給される排ガスの量および性状が常
に一定であれば、循環タンクに新たに供給する吸収液量
は一定量でよい。また、排ガスの量が変化しても性状が
一定であり、吸収剤の表面に難溶性の化合物であるアパ
タイトが生成して、吸収剤の活性が低下する原因となる
成分が含まれていなければ、循環タンク内の吸収液中の
吸収剤の消費によるｐＨの低下はすべて脱硫によるもの
であり、この場合には、ｐＨの検出値が安定した脱硫率
を得るために予め設定されたｐＨ設定値以上になるよう
に吸収液を供給する方法、または処理ガス量、吸収塔入
口のＳＯｘ濃度および要求脱硫率を掛け合わすことによ
り求めた必要吸収剤濃度になるように吸収液を供給する
方法、または、好ましくは前記必要吸収剤濃度に排ガス
量の急変化に対する余裕代しての過剰率 （供給吸収剤量−必要吸収剤量）／（必要吸収剤量） を掛け合わせた吸収剤濃度になるように吸収液を供給す
る方法で対応できる。If the amount and properties of the exhaust gas supplied to the absorption tower are always constant, the amount of the absorbing liquid newly supplied to the circulation tank may be constant. In addition, even if the amount of exhaust gas changes, the properties are constant, and apatite which is a hardly soluble compound is generated on the surface of the absorbent, and if a component that causes a decrease in the activity of the absorbent is not included. The decrease in pH due to the consumption of the absorbent in the absorbent in the circulation tank is entirely due to desulfurization. In this case, the detected pH value is a preset pH set value to obtain a stable desulfurization rate. A method of supplying an absorbing solution as described above, or a method of supplying an absorbing solution so as to have a required absorbent concentration obtained by multiplying a processing gas amount, an SOx concentration at an inlet of an absorption tower, and a required desulfurization rate, or Preferably, the absorbent concentration is obtained by multiplying the required absorbent concentration by an excess ratio (amount of supplied absorbent-amount of required absorbent) / (amount of required absorbent) with a margin for a sudden change in the amount of exhaust gas. Supply the absorbent You can respond in a way that.
【００３４】しかしながら、吸収塔に供給される排ガス
の量および性状が変化し、吸収剤の表面に難溶性の化合
物であるアパタイトが生成して、吸収剤の活性が低下す
る原因となる成分が含まれている場合には、前記の方法
は使用できない。However, the amount and properties of the exhaust gas supplied to the absorption tower change, and apatite, which is a poorly soluble compound, is formed on the surface of the absorbent, and contains components that cause a decrease in the activity of the absorbent. If so, the above method cannot be used.
【００３５】すなわち、この場合の循環タンク内の吸収
液中のｐＨの低下は、脱硫による吸収剤の消費に加えて
吸収剤の活性低下によるものであり、ｐＨ値のみで調整
する方法では、吸収液の供給量の増加が吸収剤の活性低
下に追いつかず、ｐＨ値の回復は遅れることから吸収液
の供給が少なくなり対応できない。That is, the decrease in the pH of the absorbent in the circulation tank in this case is due to the decrease in the activity of the absorbent in addition to the consumption of the absorbent by desulfurization. An increase in the supply amount of the liquid cannot catch up with a decrease in the activity of the absorbent, and the recovery of the pH value is delayed.
【００３６】また、吸収剤濃度値のみで調整する方法で
は、吸収剤濃度値には活性が低下した吸収剤も含まれる
ことから吸収液の供給が過剰となり対応できない。Also, in the method of adjusting only with the absorbent concentration value, the absorbent concentration value includes the absorbent whose activity has been reduced, so that the supply of the absorbing liquid becomes excessive and cannot be handled.
【００３７】また、前記ｐＨ値のみで調整する方法の場
合に、ｐＨ値の回復を早めるためにアルカリ剤を吸収液
と共に供給する方法もあるが、アルカリ剤は吸収液中に
溶解することによって、吸収剤の表面に難溶性の化合物
であるアパタイトが生成しないようにすることはできる
が、すでに難溶性の化合物が生成した吸収剤については
活性は低下したままである。また、排ガス条件によって
最適ｐＨ値が異なる。In the case of the method of adjusting only the pH value, there is also a method of supplying an alkali agent together with the absorbing solution in order to speed up the recovery of the pH value. However, the alkali agent is dissolved in the absorbing solution. Although it is possible to prevent apatite, which is a poorly soluble compound, from being formed on the surface of the absorbent, the activity of the absorbent in which a poorly soluble compound has been formed remains reduced. Further, the optimum pH value differs depending on the exhaust gas conditions.
【００３８】したがって、活性の低下によってｐＨが脱
硫率を維持するのに必要な値以下にならないように調整
するには、予め設定するｐＨ値を高くし、常に過剰な吸
収液およびアルカリ剤を供給する必要がある。Therefore, in order to adjust the pH so that it does not become lower than the value required for maintaining the desulfurization rate due to the decrease in the activity, increase the preset pH value and always supply excess absorbent and alkaline agent. There is a need to.
【００３９】これに対して、本発明によれば吸収塔に供
給される排ガスの量および性状が変化し、排ガス中に吸
収剤の表面に難溶性の化合物であるアパタイトが生成し
て、吸収剤の活性が低下する原因となる成分が含まれて
いる場合にも、吸収液供給量が過剰に上昇することな
く、吸収液のｐＨ、脱硫率を維持できる。On the other hand, according to the present invention, the amount and properties of the exhaust gas supplied to the absorption tower are changed, and apatite, which is a compound which is hardly soluble on the surface of the absorbent, is generated in the exhaust gas. Even when a component causing a decrease in the activity of the absorbent is contained, the pH of the absorbent and the desulfurization rate can be maintained without excessively increasing the supply of the absorbent.
【００４０】また、吸収液中の未反応吸収剤濃度が保た
れるので、回収される石膏の純度も一定に保たれる。さ
らに吸収塔に供給するアルカリ剤も過剰に消費すること
がない。Further, since the concentration of the unreacted absorbent in the absorbing solution is maintained, the purity of the recovered gypsum is maintained constant. Further, the alkaline agent supplied to the absorption tower is not excessively consumed.
【００４１】すなわち、本発明は、吸収塔入口の排ガス
量、ＳＯｘ濃度、循環タンク内の吸収液のｐＨ値および
吸収剤濃度をそれぞれ検出する手段を設け、該検出手段
によって検出した排ガス量、ＳＯｘ濃度、予め設定され
る要求脱硫率および前記検出手段によって検出した循環
タンク内の吸収液のｐＨ値と予め設定されるｐＨ値との
偏差により、前記吸収液の供給量の調整手段を制御する
構成であるので、処理ガス量および吸収塔入口のＳＯｘ
濃度が変化した場合には、循環タンク内の吸収液のｐＨ
値の変化が数秒から数十秒程度で測定できるので、ｐＨ
値の回復が早期に行える。したがって、吸収液供給量が
過剰に供給されることがない。That is, the present invention provides means for detecting the exhaust gas amount at the inlet of the absorption tower, the SOx concentration, the pH value of the absorbent in the circulation tank, and the absorbent concentration, respectively. A configuration for controlling the means for adjusting the supply amount of the absorbing liquid based on a concentration, a predetermined required desulfurization rate, and a deviation between the pH value of the absorbing liquid in the circulation tank detected by the detecting means and the predetermined pH value. Therefore, the processing gas amount and SOx at the inlet of the absorption tower
If the concentration changes, adjust the pH of the absorbent in the circulation tank.
Since the change in the value can be measured in several seconds to several tens of seconds, the pH
The value can be recovered early. Therefore, the supply amount of the absorbing liquid is not excessively supplied.
【００４２】また、前記検出手段により循環タンク内の
吸収液の吸収剤濃度を連続的に検出しているので、検出
した吸収剤濃度が前記予め設定される循環タンク内の吸
収剤濃度以上となっても、依然として循環タンク内の吸
収液のｐＨ値が回復していないことから、循環タンク内
の吸収液の吸収剤に活性低下が発生し始めたことを活性
低下の初期段階で検知できる。Since the detecting means continuously detects the absorbent concentration of the absorbent in the circulating tank, the detected absorbent concentration becomes equal to or higher than the preset absorbent concentration in the circulating tank. However, since the pH value of the absorbent in the circulation tank has not yet been recovered, it is possible to detect at the initial stage of activity decrease that the activity of the absorbent in the absorbent in the circulation tank has started to decrease.
【００４３】したがって、その場合には、前記アルカリ
剤の供給量の調整手段を制御する構成としているので、
脱硫活性低下の初期段階でアルカリ剤が供給されること
で、循環タンク内の吸収液の吸収剤に新たに活性低下が
発生するのを防止することができ、循環タンク内の吸収
液の吸収剤濃度を予め設定される循環タンク内の吸収剤
濃度に維持する運用が行える。こうして本発明では、脱
硫活性が低下した場合にも、吸収液供給量が過剰に供給
されることがなく、アルカリ剤が過剰に供給されること
もない。Therefore, in this case, the control means for controlling the supply amount of the alkaline agent is controlled.
By supplying the alkaline agent at the initial stage of the reduction of the desulfurization activity, it is possible to prevent the activity of the absorbent in the circulation tank from being newly reduced, and the absorbent of the absorption liquid in the circulation tank can be prevented. An operation of maintaining the concentration at the preset absorbent concentration in the circulation tank can be performed. Thus, in the present invention, even when the desulfurization activity decreases, the supply amount of the absorbing liquid is not excessively supplied, and the alkaline agent is not excessively supplied.
【００４４】また、予め設定される循環タンク内の吸収
剤濃度を設定する場合に、処理ガス量、吸収塔入口のＳ
Ｏｘ濃度および要求脱硫率を掛け合わすことにより求め
ることができるが、さらに吸収剤供給量の余裕代として
設定吸収剤過剰率を掛け合わすことにより求めること
で、脱硫性能における信頼性を向上することができる。When the concentration of the absorbent in the circulation tank is set in advance, the amount of the processing gas, the S
Although it can be obtained by multiplying the Ox concentration and the required desulfurization rate, the reliability in desulfurization performance can be improved by multiplying by the set absorbent excess rate as a margin for the supply amount of the absorbent. it can.
【００４５】[0045]
【発明の実施の形態】本発明の実施の形態を説明する。
湿式排煙脱硫装置の一実施例となる系統を図１に示す。
図１に示すように、ボイラ等からの排ガス１は入口煙道
３から吸収塔４に導入され、吸収塔４内に設置されたス
プレ段８を介して、該スプレ段８に設置されたスプレノ
ズルより噴霧される吸収液の液滴と接触する。吸収液の
液滴と排ガス１の接触により、排ガス１中のばいじん
（アルミニウムなどの成分からなる）や塩化水素（ＨＣ
１）、フッ化水素（ＨＦ）等の酸性ガスとともに、排ガ
ス１中のＳＯ2が液滴に吸収される。Embodiments of the present invention will be described.
FIG. 1 shows a system as an embodiment of a wet flue gas desulfurization device.
As shown in FIG. 1, exhaust gas 1 from a boiler or the like is introduced into an absorption tower 4 from an inlet flue 3, passes through a spray stage 8 installed in the absorption tower 4, and is spray nozzles installed in the spray stage 8. It comes in contact with droplets of the absorbing liquid which are sprayed more. The contact between the droplets of the absorbing liquid and the exhaust gas 1 causes dust (consisting of components such as aluminum) and hydrogen chloride (HC)
1) SO 2 in the exhaust gas 1 is absorbed by the droplets together with the acid gas such as hydrogen fluoride (HF).
【００４６】ガスに同伴されるミストは後流側のミスト
エリミネータ５により除去され、清浄な排ガス２は出口
煙道６を経て、必要により再加熱されて煙突より排出さ
れる。The mist entrained by the gas is removed by the mist eliminator 5 on the downstream side, and the clean exhaust gas 2 is reheated as required through the outlet flue 6 and discharged from the chimney.
【００４７】この時の処理ガス量は入口煙道３に設けら
れた処理ガス流量計４５で、吸収塔４の入口排ガス１中
のＳＯ2濃度は入口煙道３に設けられた入口ＳＯ2計４１
で、吸収塔４の出口排ガス２中のＳＯ2濃度は出口煙道
６に設けられた出口ＳＯ2計４２で測定される。At this time, the amount of the processing gas is measured by a processing gas flow meter 45 provided in the inlet flue 3, and the SO 2 concentration in the exhaust gas 1 at the inlet of the absorption tower 4 is measured by the inlet SO 2 meter provided in the inlet flue 3. 41
The SO 2 concentration in the exhaust gas 2 at the outlet of the absorption tower 4 is measured by an outlet SO 2 meter 42 provided in the outlet flue 6.
【００４８】ＳＯ2の吸収剤である石灰石１６は石灰石
スラリ槽１５から石灰石スラリポンプ１７により抜き出
され、石灰石スラリ流量調節弁１８によりＳＯ2吸収量
に応じて、吸収塔４内に吸収液である石灰石スラリとし
て供給される。吸収塔４下部の循環タンク４’内の吸収
液は、吸収塔循環ポンプ７により抜き出されて昇圧さ
れ、吸収塔４内のスプレノズルが配置されたスプレ段８
に供給される。Limestone 16, which is an SO 2 absorbent, is extracted from a limestone slurry tank 15 by a limestone slurry pump 17, and is supplied into an absorption tower 4 by a limestone slurry flow control valve 18 according to the amount of SO 2 absorbed. Supplied as a limestone slurry. The absorption liquid in the circulation tank 4 'at the lower part of the absorption tower 4 is withdrawn by the absorption tower circulation pump 7 and pressurized, and the spray stage 8 in which the spray nozzle in the absorption tower 4 is disposed.
Supplied to
【００４９】吸収塔４内で除去されたＳＯ2は、吸収液
中のカルシウムと反応し、中間生成物として重亜硫酸カ
ルシウムを含む亜硫酸カルシウムになり、酸化用空気ブ
ロワ２１から循環タンク４’内に供給される空気によっ
て酸化されて、最終生成物である石膏になる。The SO 2 removed in the absorption tower 4 reacts with calcium in the absorbing solution to become calcium sulfite containing calcium bisulfite as an intermediate product, and is transferred from the oxidizing air blower 21 to the circulation tank 4 ′. It is oxidized by the supplied air into gypsum, which is the end product.
【００５０】前記酸化用空気は、酸化用撹拌機２６によ
り微細化されて供給されることにより、酸化用空気の利
用率が高められている。The oxidizing air is finely supplied by the oxidizing agitator 26 and supplied, thereby increasing the utilization rate of the oxidizing air.
【００５１】その後、循環タンク４’内の吸収液は抜き
出しポンプ９により生成した石膏量に応じて抜き出され
るが、その一部はｐＨ計タンク３０と吸収剤濃度計３２
に送られ、前記タンク３０に設置されたｐＨ計３１によ
り循環タンク４’内の吸収液のｐＨ値が常時検出され、
前記吸収剤濃度計３２により循環タンク４’内の吸収液
中の吸収剤濃度が常時検出される。Thereafter, the absorbent in the circulation tank 4 'is withdrawn by the withdrawal pump 9 in accordance with the amount of gypsum generated, and a part thereof is a pH meter tank 30 and an absorbent concentration meter 32.
The pH value of the absorbing solution in the circulation tank 4 'is constantly detected by the pH meter 31 installed in the tank 30,
The concentration of the absorbent in the absorbent in the circulation tank 4 'is constantly detected by the absorbent concentration meter 32.
【００５２】一方、抜き出しポンプ９により循環タンク
４’から抜き出された吸収液の一部は、石膏脱水設備１
０に送られて脱水された後、必要に応じて石膏中の可溶
性の不純物を除去するために洗浄され、粉体の石膏１１
として回収される。また、石膏１１と分離された水１２
は石灰石スラリ槽１５等の補給水として系内で再利用さ
れるが、その一部は塩素等の濃縮を防ぐために排水１４
として抜き出され排水処理設備５０に送られる。On the other hand, part of the absorbing liquid extracted from the circulation tank 4 ′ by the extraction pump 9 is used for the gypsum dewatering equipment 1.
And then washed to remove soluble impurities in the gypsum, if necessary, to remove powdered gypsum 11
Will be collected as Further, plaster 11 and separated water 12
Is reused in the system as makeup water for the limestone slurry tank 15, etc., but part of it is drained to prevent concentration of chlorine etc.
And sent to the wastewater treatment facility 50.
【００５３】また、処理ガス流量計４５、入口ＳＯ2計
４１、ｐＨ計３１、脱硫排水流量計１４’および吸収剤
濃度計３２からの信号に基づき、石灰石スラリ流量調整
弁１８及びアルカリ剤流量調整弁５３を制御する制御装
置４３を設けている。Further, based on signals from the processing gas flow meter 45, the inlet SO 2 meter 41, the pH meter 31, the desulfurization waste water flow meter 14 'and the absorbent concentration meter 32, the limestone slurry flow control valve 18 and the alkali agent flow control. A control device 43 for controlling the valve 53 is provided.
【００５４】本発明の実施例となる湿式排ガス脱硫装置
の制御系統を図２に示す。図２は前記制御装置４３によ
る制御内容を示すものである。まず、処理ガス流量計４
５および入口ＳＯ2計４１からの信号を乗算器１０１で
掛け合わせることによってウェットベースのＳＯ2量を
得る。次に、補正器１０２により、ウェットベースをド
ライベースに変換するための定数、要求脱硫率および当
量の石灰石に変換するための定数などを掛け合わせるこ
とによって理論値となる吸収液供給量を得る。FIG. 2 shows a control system of the wet exhaust gas desulfurization apparatus according to the embodiment of the present invention. FIG. 2 shows the contents of control by the control device 43. First, the processing gas flow meter 4
5 and the signal from the inlet SO 2 meter 41 are multiplied by a multiplier 101 to obtain a wet base SO 2 amount. Next, the corrector 102 multiplies the constant for converting the wet base to the dry base, the required desulfurization rate, the constant for converting to the equivalent limestone, and the like to obtain the absorption liquid supply amount that becomes the theoretical value.
【００５５】さらに、前記吸収液供給量の理論値には関
数発生器１０７によって吸収剤過剰率が乗算された過剰
分が加算機１０８において加えられ、ベースとなる吸収
液供給量を得る。前記吸収剤過剰率は、吸収液の余裕代
として排ガス条件の急変化に対応するために設定される
係数である。Further, an excess obtained by multiplying the theoretical value of the supply amount of the absorbent by the excess amount of the absorbent by the function generator 107 is added in an adder 108 to obtain a base supply amount of the absorbent. The excess amount of the absorbent is a coefficient set as a margin for the absorption liquid to cope with a sudden change in exhaust gas conditions.
【００５６】得られた吸収液供給量は、理論値に過剰分
を加えたものであるが、脱硫装置の性能を維持するため
には、実際の吸収液のｐＨを検出し、排ガス条件によっ
て予め設定したｐＨ値との偏差が生じた場合には、偏差
を補うだけの吸収液が供給されなければならない。この
場合に、予め設定するｐＨ値は、排ガス条件によって最
適ｐＨ値が異なることから、これを考慮して、吸収液の
供給量が過小または過剰にならないように設定する。The obtained absorption liquid supply amount is obtained by adding an excess amount to the theoretical value. However, in order to maintain the performance of the desulfurization device, the actual pH of the absorption liquid is detected, and the pH is determined in advance according to exhaust gas conditions. When a deviation from the set pH value occurs, an absorbing solution that compensates for the deviation must be supplied. In this case, the preset pH value is set such that the supply amount of the absorbing liquid does not become too small or too large in consideration of the fact that the optimum pH value differs depending on the exhaust gas condition.
【００５７】すなわち、本実施例においては、前記吸収
液供給量の理論値またはドライベースのＳＯ2量の高低
から関数発生器１０３によって、吸収液のｐＨの最適設
定値を得て、ｐＨ計３１により検出した循環タンク内の
吸収液のｐＨ検出値とを比較器１０４により比較し、比
例積分器１０５、手動／自動切換器１０６を経て、吸収
液のｐＨ偏差により補正分として、加算機１０９によっ
て、前記ベースとなる吸収供給量に加算され、吸収液供
給量の補正値となる。That is, in this embodiment, the optimal set value of the pH of the absorbing solution is obtained by the function generator 103 from the theoretical value of the supply amount of the absorbing solution or the level of the dry base SO 2 , and the pH meter 31 is used. The comparator 104 compares the detected pH value of the absorbing solution in the circulation tank with the comparator 104, passes through a proportional integrator 105 and a manual / automatic switching unit 106, and as a correction component based on the pH deviation of the absorbing solution, is added by an adder 109. , Is added to the base absorption supply amount, and becomes a correction value of the absorption liquid supply amount.
【００５８】さらに、前記吸収液供給量の補正値は、実
際の石灰石スラリ流量１８’と比較器１１０において比
較され、比例積分器１１１、手動／自動切換器１１２を
経て、偏差を補う方向に石灰石スラリ流量調整弁１８を
調整する。Further, the correction value of the absorption liquid supply amount is compared with the actual limestone slurry flow rate 18 ′ in the comparator 110, and passes through the proportional integrator 111 and the manual / automatic switch 112, so as to compensate for the deviation. Adjust the slurry flow control valve 18.
【００５９】吸収液に不活性な吸収剤が存在しない場合
には、ここまでの制御を行えばよいが、排ガス性状によ
って、不活性な吸収剤が生じた場合には、脱硫装置の性
能を維持することができない。しかしながら、本実施例
においては、さらに吸収剤濃度計３２からの信号を排ガ
ス性状に応じて予め設定した吸収剤濃度との偏差から、
不活性な吸収剤の発生を初期段階で検知し、その量に応
じてアルカリ剤を供給しているので、脱硫装置の性能が
以下するのを防止できる。If there is no inert absorbent in the absorbent, the above control may be performed. However, if an inert absorbent is generated due to the properties of the exhaust gas, the performance of the desulfurization apparatus is maintained. Can not do it. However, in the present embodiment, the signal from the absorbent concentration meter 32 is further determined from the deviation from the absorbent concentration set in advance according to the properties of the exhaust gas.
Since the generation of the inert absorbent is detected at the initial stage, and the alkali agent is supplied in accordance with the amount thereof, the performance of the desulfurizer can be prevented from lowering.
【００６０】すなわち、関数発生器１１３によって、前
記ベースとなる吸収液供給量から循環タンク４’内の吸
収液の吸収剤濃度の設定値を算出し、これを吸収剤濃度
計３２で検出した検出値と比較器１１４で比較し、比例
積分器１１５および手動／自動切換器１１６を経て、関
数発生器１１７により、吸収剤濃度の偏差と当量のベー
スとなるアルカリ剤供給量を算出する。That is, the function generator 113 calculates the set value of the absorbent concentration of the absorbent in the circulating tank 4 ′ from the supply amount of the absorbent serving as the base, and detects the set value of the absorbent concentration meter 32. The value is compared with a comparator 114, and is passed through a proportional integrator 115 and a manual / automatic switch 116. Then, a function generator 117 calculates a deviation of the absorbent concentration and a supply amount of the alkaline agent as a basis of the equivalent.
【００６１】ここで、アルカリ剤は脱硫装置系統内から
系外に排水される脱硫排水に含まれるため、排水される
アルカリ剤量を補う必要がある。したがって、本実施例
においては、脱硫排水流量計１４’からの脱硫排水流量
により、関数発生器１２２によって排水されるアルカリ
剤量を算出し、これを加算器１１８で、前記ベースとな
るアルカリ剤供給量に加算することで、アルカリ剤供給
量の補正値を得ている。Here, since the alkali agent is contained in the desulfurization effluent discharged from the desulfurization system to the outside of the system, it is necessary to supplement the amount of the alkali agent discharged. Therefore, in the present embodiment, the amount of alkaline agent drained by the function generator 122 is calculated based on the desulfurized wastewater flow rate from the desulfurized wastewater flow meter 14 ′, and this is added by the adder 118 to the alkaline agent supply as the base. By adding to the amount, a correction value of the alkali agent supply amount is obtained.
【００６２】さらに、前記アルカリ剤供給量の補正値は
アルカリ剤流量計５３’により測定される実際のアルカ
リ剤流量と比較器１１９において比較され、比例積分器
１２０および手動／自動切換器１２１を経て、偏差を補
う方向にアルカリ剤流量調整弁５３を調整する。Further, the correction value of the alkali agent supply amount is compared with the actual alkali agent flow rate measured by the alkali agent flow meter 53 ′ in the comparator 119, and passed through the proportional integrator 120 and the manual / automatic switch 121. Then, the alkali agent flow control valve 53 is adjusted in a direction to compensate for the deviation.
【００６３】本発明の上記実施例においては、常時、処
理ガス流量計４５、入口ＳＯｘ計４１、ｐＨ計３１およ
び吸収剤濃度計３２での検出を行うと共に、ｐＨ値およ
び吸収剤濃度の検出値と設定値との偏差を算出する演算
を行い、石灰石スラリ流量調整弁１８およびアルカリ剤
流量調整弁５３の制御を行うので、ボイラ燃料切り替え
等による排ガス性状変化により吸収剤の活性が急激に低
下する場合においても、吸収剤濃度の増加を初期段階で
検出すると共に、その時のｐＨ値の回復状況によって活
性の低下の発生を初期段階で検知でき、最小限のアルカ
リ剤量を供給する。したがって、アルカリ剤および吸収
剤の供給量を過剰に増加させることなく吸収液の活性低
下を効果的に防止できる。In the above embodiment of the present invention, the detection by the processing gas flow meter 45, the inlet SOx meter 41, the pH meter 31, and the absorbent concentration meter 32 is always performed, and the detected values of the pH value and the absorbent concentration are measured. And the set value are calculated to control the limestone slurry flow control valve 18 and the alkaline agent flow control valve 53, so that the activity of the absorbent rapidly decreases due to a change in the exhaust gas properties due to boiler fuel switching or the like. Also in this case, an increase in the concentration of the absorbent is detected at an early stage, and the occurrence of a decrease in the activity can be detected at an early stage depending on the recovery state of the pH value at that time, so that a minimum amount of the alkaline agent is supplied. Therefore, it is possible to effectively prevent a decrease in the activity of the absorbing solution without excessively increasing the supply amounts of the alkali agent and the absorbent.
【００６４】[0064]
【発明の効果】本発明によれば、ボイラ等の燃焼排ガス
中のＳＯｘ、酸性ガス、および燃料中の金属成分を含む
ばいじんに起因した反応により、吸収剤の活性が低下し
た場合でも、脱硫性能を保ちつつ、吸収剤やアルカリ剤
等のユーティリティを最小限に低減することが可能とな
り、また石膏純度も一定に保つことができる。According to the present invention, the desulfurization performance can be reduced even if the activity of the absorbent is reduced due to the reaction caused by SOx in the combustion exhaust gas of a boiler or the like and soot containing a metal component in the fuel. While maintaining utility, it is possible to reduce utilities such as absorbents and alkaline agents to a minimum, and the gypsum purity can be kept constant.
【図１】 本発明の実施例になる湿式排ガス脱硫装置の
系統を示す図である。FIG. 1 is a diagram showing a system of a wet exhaust gas desulfurization apparatus according to an embodiment of the present invention.
【図２】 本発明の実施例になる湿式排ガス脱硫装置の
制御系統を示す図である。FIG. 2 is a diagram showing a control system of a wet exhaust gas desulfurization apparatus according to an embodiment of the present invention.
【図３】 従来の湿式排煙ガス硫装置の系統を示す図
で、吸収液ｐＨにより吸収剤供給量を制御している。FIG. 3 is a diagram showing a system of a conventional wet-type flue gas sulfurizing apparatus, in which the supply amount of the absorbent is controlled by the pH of the absorbent.
【図４】 従来の湿式排ガス脱硫装置の系統を示す図
で、吸収液中の吸収剤濃度により吸収剤供給量を制御し
ている。FIG. 4 is a diagram showing a system of a conventional wet exhaust gas desulfurization apparatus, in which the supply amount of the absorbent is controlled by the concentration of the absorbent in the absorbent.
１ 入口排ガス ２ 出口排
ガス ３ 入口煙道 ４ 吸収塔 ４’循環タンク ５ ミスト
エリミネータ ６ 出口煙道 ７ 吸収液
循環ポンプ ８ スプレ段 ９ 抜き出
しポンプ １０ 石膏脱水設備 １１ 石膏 １２ 分離水 １４ 排水 １４’ 脱硫排水流量計 １５ 石灰
石スラリ槽 １６ 石灰石 １７ 石灰
石スラリポンプ １８ 石灰石スラリ流量調節弁 １８’ 石
灰石スラリ流量計 ２１ 酸化用空気ブロワ ２６ 酸化
用撹拌機 ３０ ｐＨ計タンク ３１ ｐＨ
計 ３２ 吸収剤濃度計 ４１ 入口
ＳＯ2計 ４２ 出口ＳＯ2計 ４３ 制御
装置 ４５ 処理ガス流量計 ５０ 排水
処理設備 ５１ アルカリ剤タンク ５２ アル
カリ剤ポンプ ５３ アルカリ剤流量調整弁 ５３’ ア
ルカリ剤流量計DESCRIPTION OF SYMBOLS 1 Inlet exhaust gas 2 Outlet exhaust gas 3 Inlet flue 4 Absorption tower 4'Circulation tank 5 Mist eliminator 6 Outlet flue 7 Absorbent circulation pump 8 Spray stage 9 Extraction pump 10 Gypsum dewatering equipment 11 Gypsum 12 Separated water 14 Drainage 14 'Desulfurization drainage Flowmeter 15 Limestone slurry tank 16 Limestone 17 Limestone slurry pump 18 Limestone slurry flow control valve 18 'Limestone slurry flowmeter 21 Oxidation air blower 26 Oxidizing stirrer 30 pH meter tank 31 pH
Total of 32 absorbent densitometer 41 inlet SO 2 meter 42 outlet SO 2 meter 43 the control unit 45 processing gas flowmeter 50 wastewater treatment equipment 51 alkaline agent tank 52 alkali agent pump 53 alkali agent flow regulating valve 53 'alkaline agent flow meter
Claims (8)
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、 吸収液中の吸収剤濃度のうち不活性な吸収剤の割合に応
じて、吸収塔に供給する前記アルカリ剤の供給量を調整
する制御装置を設けたことを特徴とする湿式排ガス脱硫
装置。1. A combustion exhaust gas comprising a sulfur oxide, an acid gas, and a dust containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. A wet exhaust gas desulfurization apparatus further comprising a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, wherein the ratio of the inert absorbent to the absorbent concentration in the absorbent is A wet exhaust gas desulfurization apparatus, comprising: a control device that adjusts a supply amount of the alkaline agent to be supplied to the absorption tower according to the above.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、 吸収塔入口の排ガス量、硫黄酸化物濃度、循環タンク内
の吸収液のｐＨ値および吸収剤濃度をそれぞれ検出する
手段と、 循環タンク内に供給する吸収液を調整する調整手段と、 循環タンク内に供給するアルカリ剤の供給量を調整する
調整手段とを設け、 検出排ガス量と検出硫黄酸化物濃度、予め設定される要
求脱硫率および検出ｐＨ値と予め設定されるｐＨ値との
偏差に基づき、前記吸収液の供給量の調整手段を調整す
ると共に、検出吸収剤濃度が、予め設定される循環タン
ク内の吸収剤濃度となるように、前記アルカリ剤の供給
量の調整手段を調整する制御装置を設けたことを特徴と
する湿式排ガス脱硫装置。2. A combustion exhaust gas comprising a sulfur oxide, an acid gas and a dust containing a metal component in a fuel is introduced into an absorption tower, and is brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, A means for detecting the pH value and the concentration of the absorbent in the absorbing solution, an adjusting means for adjusting the absorbing solution supplied to the circulation tank, and an adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank are provided. Means for adjusting the supply amount of the absorbing liquid based on the detected exhaust gas amount and the detected sulfur oxide concentration, a predetermined required desulfurization rate, and a deviation between the detected pH value and a predetermined pH value. And a control device that adjusts the means for adjusting the supply amount of the alkaline agent so that the detected absorbent concentration becomes a preset absorbent concentration in the circulation tank. Exhaust gas desulfurization equipment.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、 吸収塔入口の排ガス量、硫黄酸化物濃度、循環タンク内
の吸収液のｐＨ値および吸収剤濃度をそれぞれ検出する
手段と、 循環タンク内に供給する吸収液を調整する調整手段と、 循環タンク内に供給するアルカリ剤の供給量を調整する
調整手段とを設け、 検出排ガス量と検出硫黄酸化物濃度、予め設定される要
求脱硫率、循環タンク内の吸収剤過剰率および検出ｐＨ
値と予め設定されるｐＨ値との偏差に基づき、前記吸収
液の供給量の調整手段を調整すると共に、検出吸収剤濃
度と予め設定される循環タンク内の吸収剤濃度との偏差
に基づき、検出吸収剤濃度が予め設定される循環タンク
内の吸収剤過剰率に相当する濃度となるように、前記ア
ルカリ剤の供給量の調整手段を調整調整する制御装置を
設けたことを特徴とする湿式排ガス脱硫装置。3. A combustion exhaust gas comprising a sulfur oxide, an acid gas, and a dust containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, A means for detecting the pH value and the concentration of the absorbent in the absorbing solution, an adjusting means for adjusting the absorbing solution supplied to the circulation tank, and an adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank are provided. , Detected exhaust gas amount and detected sulfur oxide concentration, predetermined required desulfurization rate, excess absorbent in circulation tank and detected pH
Based on the deviation between the value and the preset pH value, adjust the means for adjusting the supply amount of the absorbent, and based on the deviation between the detected absorbent concentration and the preset absorbent concentration in the circulation tank, A control device that adjusts and adjusts the means for adjusting the supply amount of the alkaline agent so that the detected absorbent concentration becomes a concentration corresponding to a preset excess amount of the absorbent in the circulation tank. Exhaust gas desulfurization equipment.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫装置において、 吸収塔入口の排ガス量、硫黄酸化物濃度、循環タンク内
の吸収液のｐＨ値および吸収剤濃度をそれぞれ検出する
手段と、 循環タンク内に供給する吸収液を調整する調整手段と、 循環タンク内に供給するアルカリ剤の供給量を調整する
調整手段とを設け、 検出排ガス量と検出硫黄酸化物濃度、予め設定される要
求脱硫率および循環タンク内の吸収剤過剰率から、排ガ
ス処理に必要な吸収液の必要供給量の先行値を設定し、
該先行値を検出ｐＨ値と予め設定されるｐＨ値との偏差
に基づき補正した補正値となるように吸収液の供給量の
調整手段を調整すると共に、検出吸収剤濃度と予め設定
される循環タンク内の吸収剤濃度との偏差に基づき、ア
ルカリ剤の供給量の調整手段を、検出吸収剤濃度が予め
設定される循環タンク内の吸収剤過剰率に相当する濃度
となるように調整する制御装置を設けたことを特徴とす
る湿式排ガス脱硫装置。4. A combustion exhaust gas comprising a sulfur oxide, an acid gas and soot containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. Further, in a wet exhaust gas desulfurization apparatus having a means for supplying an absorbent and an alkaline agent containing the calcium-based absorbent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, sulfur oxide concentration, A means for detecting the pH value and the concentration of the absorbent in the absorbing solution, an adjusting means for adjusting the absorbing solution supplied to the circulation tank, and an adjusting means for adjusting the supply amount of the alkaline agent supplied to the circulation tank are provided. From the detected exhaust gas amount and the detected sulfur oxide concentration, the required desulfurization rate set in advance and the excess amount of the absorbent in the circulation tank, the leading value of the necessary supply amount of the absorbent required for the exhaust gas treatment is calculated. Set,
The adjusting means for adjusting the supply amount of the absorbing liquid is adjusted so that the preceding value is corrected based on the deviation between the detected pH value and the preset pH value, and the detected absorbent concentration and the preset circulation value are adjusted. Control for adjusting the supply amount of the alkaline agent based on the deviation from the absorbent concentration in the tank so that the detected absorbent concentration becomes a concentration corresponding to a preset excess ratio of the absorbent in the circulation tank. A wet exhaust gas desulfurization device comprising a device.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、吸収液の一部を再
び排ガスと接触させるとともに、その他の一部を石膏回
収系に抜き出し、さらに前記カルシウム系吸収剤を含む
吸収液およびアルカリ剤を循環タンク内の吸収液中に供
給する手段を有する湿式排ガス脱硫方法において、 吸収液中の吸収剤濃度のうち不活性な吸収剤の割合に応
じて、吸収塔に供給する前記アルカリ剤の供給量を調整
することを特徴とする湿式排ガス脱硫方法。5. A combustion exhaust gas comprising a sulfur oxide, an acid gas and a dust containing a metal component in a fuel is introduced into an absorption tower, and is brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays, and a part of the absorption liquid is brought into contact with the exhaust gas again, and another part is extracted to the gypsum recovery system. A wet exhaust gas desulfurization method further comprising a means for supplying the absorbent containing the calcium-based absorbent and the alkaline agent into the absorbent in the circulation tank, wherein the ratio of the inert absorbent to the absorbent in the absorbent is A wet exhaust gas desulfurization method, wherein the supply amount of the alkaline agent supplied to the absorption tower is adjusted according to the following conditions.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、 吸収塔入口の排ガス量と硫黄酸化物濃度と循環タンク内
の吸収液のｐＨ値をそれぞれ検出し、予め設定される要
求脱硫率および前記循環タンク内の吸収液のｐＨ値と予
め設定されるｐＨ値との偏差に基づき、吸収液の供給量
を調整すると共に、検出吸収剤濃度が、予め設定される
循環タンク内の吸収剤濃度となるように、前記アルカリ
剤の供給量を調整することを特徴とする湿式排ガス脱硫
方法。6. A combustion exhaust gas comprising a sulfur oxide, an acid gas, and a dust containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorbing solution containing a calcium-based absorbent, thereby obtaining sulfur oxide in the exhaust gas. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method of supplying the absorbent containing the calcium-based absorbent and the alkaline agent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Detecting the pH value of the liquid, and adjusting the supply amount of the absorption liquid based on a deviation between the predetermined required desulfurization rate and the pH value of the absorption liquid in the circulation tank and the predetermined pH value, A wet exhaust gas desulfurization method comprising adjusting the supply amount of the alkaline agent so that the detected absorbent concentration becomes a preset absorbent concentration in the circulation tank.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、 吸収塔入口の排ガス量と硫黄酸化物濃度と循環タンク内
の吸収液のｐＨ値をそれぞれ検出し、予め設定される要
求脱硫率、循環タンク内の吸収剤過剰率および前記循環
タンク内の吸収液のｐＨ値と予め設定されるｐＨ値との
偏差に基づき、吸収液の供給量を調整すると共に、 循環タンク内の吸収剤濃度検出値と予め設定される循環
タンク内の吸収剤濃度との偏差に基づき、検出吸収剤濃
度が予め設定される循環タンク内の吸収剤過剰率に相当
する濃度となるように循環タンク内へのアルカリ剤の供
給量を調整することを特徴とする湿式排ガス脱硫方法。7. A combustion exhaust gas comprising a sulfur oxide, an acidic gas and a dust containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent, thereby obtaining sulfur oxide in the exhaust gas. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method of supplying the absorbent containing the calcium-based absorbent and the alkaline agent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Each of the pH values of the liquids is detected, and based on a predetermined required desulfurization rate, an excess rate of the absorbent in the circulation tank, and a deviation between the pH value of the absorbent in the circulation tank and the predetermined pH value, In addition to adjusting the liquid supply amount, the circulating tank in which the detected sorbent concentration is set in advance based on the deviation between the sorbent concentration detection value in the circulating tank and the preset sorbent concentration in the circulatory tank. Wet flue gas desulfurization method characterized by adjusting the supply amount of the alkali agent to the corresponding density become as circulating tank to absorbent excess of the inner.
属成分を含むばいじんからなる燃焼排ガスを吸収塔に導
入して、カルシウム系吸収剤を含む吸収液と接触させ
て、排ガス中の硫黄酸化物を吸収液中に吸収させた後、
排ガス中の硫黄酸化物を吸収した吸収液が滞留する循環
タンク内の吸収液中に空気を供給し、その後、吸収液の
一部を再び排ガスと接触させるとともに、その他の一部
を石膏回収系に抜き出し、さらに前記カルシウム系吸収
剤を含む吸収液およびアルカリ剤を循環タンク内の吸収
液中に供給する湿式排ガス脱硫方法において、 吸収塔入口の排ガス量と硫黄酸化物濃度と循環タンク内
の吸収液のｐＨ値をそれぞれ検出し、予め設定される要
求脱硫率、循環タンク内の吸収剤過剰率から、排ガス処
理に必要な吸収液の必要供給量の先行値を設定し、該先
行値をｐＨ検出値と予め設定されるｐＨ値との偏差に基
づき補正した補正値となるように吸収液の循環タンクへ
の供給量を調整すると共に、吸収剤検出濃度と予め設定
される循環タンク内の吸収剤濃度との偏差に基づき、循
環タンク内へのアルカリ剤の供給量を調整し、検出吸収
剤濃度が予め設定される循環タンク内の吸収剤過剰率に
相当する濃度となるように調整することを特徴とする湿
式排ガス脱硫方法。8. A combustion exhaust gas comprising a sulfur oxide, an acidic gas and a dust containing a metal component in a fuel is introduced into an absorption tower, and brought into contact with an absorption liquid containing a calcium-based absorbent, whereby sulfur oxidation in the exhaust gas is carried out. After absorbing the substance in the absorbing solution,
Air is supplied to the absorption liquid in the circulation tank where the absorption liquid that has absorbed the sulfur oxides in the exhaust gas stays.After that, a part of the absorption liquid is brought into contact with the exhaust gas again, and the other part is collected in a gypsum collection system. In the wet exhaust gas desulfurization method of supplying the absorbent containing the calcium-based absorbent and the alkaline agent into the absorbent in the circulation tank, the exhaust gas amount at the inlet of the absorption tower, the sulfur oxide concentration, and the absorption in the circulation tank Each of the pH values of the liquids is detected, and from the required desulfurization rate set in advance and the excess amount of the absorbent in the circulation tank, a leading value of the necessary supply amount of the absorbing liquid required for the exhaust gas treatment is set, and the leading value is set to pH. The supply amount of the absorbent to the circulation tank is adjusted so as to be a correction value corrected based on the deviation between the detected value and the preset pH value, and the absorbent detection concentration and the absorption in the preset circulation tank are adjusted. The supply amount of the alkaline agent into the circulation tank is adjusted based on the deviation from the agent concentration, so that the detected absorbent concentration is adjusted to a concentration corresponding to a preset excess amount of the absorbent in the circulation tank. A wet exhaust gas desulfurization method characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24775996A JP3675986B2 (en) | 1996-09-19 | 1996-09-19 | Wet exhaust gas desulfurization apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24775996A JP3675986B2 (en) | 1996-09-19 | 1996-09-19 | Wet exhaust gas desulfurization apparatus and method |
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| Publication Number | Publication Date |
|---|---|
| JPH1085549A true JPH1085549A (en) | 1998-04-07 |
| JP3675986B2 JP3675986B2 (en) | 2005-07-27 |
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ID=17168247
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24775996A Expired - Fee Related JP3675986B2 (en) | 1996-09-19 | 1996-09-19 | Wet exhaust gas desulfurization apparatus and method |
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| Country | Link |
|---|---|
| JP (1) | JP3675986B2 (en) |
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