JPH0125627Y2 - - Google Patents
Info
- Publication number
- JPH0125627Y2 JPH0125627Y2 JP2389284U JP2389284U JPH0125627Y2 JP H0125627 Y2 JPH0125627 Y2 JP H0125627Y2 JP 2389284 U JP2389284 U JP 2389284U JP 2389284 U JP2389284 U JP 2389284U JP H0125627 Y2 JPH0125627 Y2 JP H0125627Y2
- Authority
- JP
- Japan
- Prior art keywords
- absorbent
- amount
- tower
- supplied
- absorption tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000002745 absorbent Effects 0.000 claims description 60
- 239000002250 absorbent Substances 0.000 claims description 60
- 238000010521 absorption reaction Methods 0.000 claims description 36
- 238000007254 oxidation reaction Methods 0.000 claims description 36
- 230000003647 oxidation Effects 0.000 claims description 34
- 239000007789 gas Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 17
- 238000006477 desulfuration reaction Methods 0.000 claims description 16
- 230000023556 desulfurization Effects 0.000 claims description 16
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000003814 drug Substances 0.000 claims description 11
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 30
- 239000002002 slurry Substances 0.000 description 28
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- 235000011121 sodium hydroxide Nutrition 0.000 description 10
- 229940079593 drug Drugs 0.000 description 9
- 239000012535 impurity Substances 0.000 description 9
- 238000006386 neutralization reaction Methods 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000012452 mother liquor Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 2
- 235000010261 calcium sulphite Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Description
【考案の詳細な説明】
［考案の技術分野］
本考案は湿式排煙脱硫装置に関し、特に排ガス
と吸収剤とを気液接触させて排ガス中のイオウ酸
化物を吸収除去する吸収塔における吸収剤の供給
装置に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a wet flue gas desulfurization system, and in particular to an absorbent in an absorption tower that absorbs and removes sulfur oxides in the exhaust gas by bringing the exhaust gas and the absorbent into gas-liquid contact. The present invention relates to a supply device.
［考案の技術的背景とその問題点］
従来、湿式排煙脱硫装置は、第１図に示すよう
にダクト１からの排ガスを吸収塔２内に導入し、
そこで循環ポンプ３からスプレー管４により塔２
内に噴射される吸収剤スラリー５と気液接触さ
せ、その吸収剤により排ガス中のイオウ酸化物を
吸収除去し、塔２の頂部より清浄なガスとして排
出している。[Technical background of the invention and its problems] Conventionally, wet flue gas desulfurization equipment introduces flue gas from a duct 1 into an absorption tower 2, as shown in FIG.
Then, the circulation pump 3 connects the column 2 with the spray pipe 4.
Gas-liquid contact is made with the absorbent slurry 5 injected into the tower, and the absorbent absorbs and removes sulfur oxides from the exhaust gas, and the resulting gas is discharged from the top of the tower 2 as a clean gas.
吸収塔２内での吸収反応は、吸収剤を石灰とし
た場合、下記の反応式となる。 The absorption reaction within the absorption tower 2 has the following reaction formula when lime is used as the absorbent.
CaCO3＋SO2＋１／２・H2O→
CaSO3・１／２H2O＋CO2↑ (1)
CaCO3＋SO2＋１／２O2＋2H2O→
CaSO4・2H2O＋CO2↑ (2)
排ガス中のイオウ酸化物を吸収した吸収剤はブ
リード管６を通して酸化塔７へ供給され、酸化塔
７の下部から供給される空気８により酸化され
る。また未反応分の吸収剤は酸化塔７に接続した
硫酸供給管９から供給される硫酸により石こう化
される。CaCO 3 +SO 2 +1/2・H 2 O→ CaSO 3・1/2H 2 O＋CO 2 ↑ (1) CaCO 3 +SO 2 +1/2O 2 +2H 2 O→ CaSO 4・2H 2 O＋CO 2 ↑ (2) In exhaust gas The absorbent that has absorbed the sulfur oxides is supplied to the oxidation tower 7 through the bleed pipe 6, and is oxidized by air 8 supplied from the lower part of the oxidation tower 7. Further, the unreacted absorbent is calcified by sulfuric acid supplied from the sulfuric acid supply pipe 9 connected to the oxidation tower 7.
これらの反応式は下記のとおりである。 These reaction formulas are as follows.
CaCO3＋H2SO4＋H2O→
CaSO4・2H2O＋CO2↑ (3)
CaSO3・１／２H2O＋１／２O2＋３／２H2O→
CaSO4・2H2O (4)
酸化塔７内で石こう化されたスラリーは分離機
１０に送られ、そこで石こうが回収されると共に
スラリーから分離された母液は管１１を通して吸
収塔２内に戻される。また吸収塔２には吸収剤ス
ラリー供給管１２より適宜吸収剤スラリーが供給
される。CaCO 3 +H 2 SO 4 +H 2 O→ CaSO 4・2H 2 O＋CO 2 ↑ (3) CaSO 3・1/2H 2 O+1/2O 2 +3/2H 2 O→ CaSO 4・2H 2 O (4) Oxidation tower 7 The slurry calcified within is sent to a separator 10 where the gypsum is recovered and the mother liquor separated from the slurry is returned to the absorption tower 2 through a pipe 11. Further, absorbent slurry is appropriately supplied to the absorption tower 2 from an absorbent slurry supply pipe 12.
この湿式排煙脱硫装置において、脱硫効率を維
持するには、吸収塔２内の吸収剤スラリーのPHを
５〜７の範囲に調整し、また酸化塔７内ではPHを
３〜５の範囲に調整しなければならない。そのた
め、循環ポンプ３からスプレー管４に流れる吸収
剤スラリーのPHを測定するPH検出器１３を設け、
このPH検出器１３で吸収剤スラリー供給管１２に
設けた制御弁１４を制御し、吸収塔２内に供給す
る吸収剤スラリーの量を調整し、そのPH制御を行
なつている。また酸化塔７においても酸化塔７内
のPHを測定するPH検出器１５を設け、そのPH検出
器１５で硫酸供給管９に設けた制御弁１６を制御
し、供給する硫酸の量の制御を行なつている。 In this wet flue gas desulfurization equipment, in order to maintain desulfurization efficiency, the pH of the absorbent slurry in the absorption tower 2 is adjusted to a range of 5 to 7, and the PH in the oxidation tower 7 is adjusted to a range of 3 to 5. have to adjust. Therefore, a PH detector 13 is provided to measure the PH of the absorbent slurry flowing from the circulation pump 3 to the spray pipe 4.
This PH detector 13 controls a control valve 14 provided in the absorbent slurry supply pipe 12, adjusts the amount of absorbent slurry to be supplied into the absorption tower 2, and performs PH control. In addition, the oxidation tower 7 is also provided with a PH detector 15 that measures the PH in the oxidation tower 7, and the PH detector 15 controls the control valve 16 installed in the sulfuric acid supply pipe 9 to control the amount of sulfuric acid to be supplied. is being carried out.
しかしながら吸収塔２内の吸収剤スラリー中に
はAl，Si，Ｆ，Clなどの不純物が溶解しており、
この不純物により吸収剤スラリーのPH値が変わる
という問題がある。特に吸収剤スラリーの母液は
分離機１０から分離された母液を繰り返し使用す
るため系内に捕促された不純物濃度が高くなると
吸収剤スラリーのPHをPH検出器１３で検出し、そ
のPH値を一定になるよう新たに吸収剤を供給しよ
うとしても不純物のためにPHが安定せず、正確な
量の吸収剤を供給することが困難となる。 However, impurities such as Al, Si, F, and Cl are dissolved in the absorbent slurry in the absorption tower 2.
This impurity causes a problem in that the pH value of the absorbent slurry changes. In particular, as the mother liquor of the absorbent slurry is the mother liquor separated from the separator 10, which is repeatedly used, when the concentration of impurities trapped in the system increases, the pH of the absorbent slurry is detected by the PH detector 13, and the PH value is measured. Even if an attempt is made to supply new absorbent to keep it constant, the pH will not stabilize due to impurities, making it difficult to supply an accurate amount of absorbent.
［考案の目的］
本考案の目的は上述した湿式排煙脱硫装置にお
いて、吸収塔へ供給する吸収剤を不純物に影響さ
れず脱硫に最適な量で供給できる吸収剤の供給装
置を提供することである。[Purpose of the invention] The purpose of the invention is to provide an absorbent supply device for the above-mentioned wet flue gas desulfurization equipment that can supply the optimal amount of absorbent to the absorption tower for desulfurization without being affected by impurities. be.
［考案の概要］
本考案は、排ガスを吸収剤と気液接触させて排
ガス中のイオウ酸化物を吸収除去する吸収塔と、
イオウ酸化物を吸収した吸収剤を酸化すると共に
未反応分を中和する酸化塔とを備えた湿式排煙脱
硫装置において、上記吸収塔から酸化塔への吸収
剤の供給量を検出するブリード量検出器と、酸化
塔内の未反応分を中和する薬剤の供給量を検出す
る薬剤量検出器と、酸化塔内のPH値が一定となる
よう薬剤の供給量を制御するPH検出器と、上記ブ
リード量検出器と薬剤量検出器との出力に応じて
吸収塔へ供給する吸収剤の量を制御する吸収剤供
給制御装置とからなるものであり、酸化と中和を
行なう酸化塔内ではPH値が３〜５の範囲で制御さ
れるため、スラリー中の不純物に影響されずに正
確な薬剤の供給が行なえ、しかもその薬剤供給量
がブリード管からの酸化塔に供給されるスラリー
中の未反応分の量に相当するため、その薬剤供給
量と酸化塔へ供給するスラリーのブリード量とか
らそのブリードしたスラリー中の未反応分の量が
判り、それに応じて吸収塔へ供給する吸収剤の量
を制御することにより、従来のように吸収塔内の
PHを測定しなくても脱硫に最適な量の吸収剤を供
給できるようにしたものである。[Summary of the invention] The invention comprises an absorption tower that absorbs and removes sulfur oxides from the exhaust gas by bringing the exhaust gas into gas-liquid contact with an absorbent;
In a wet flue gas desulfurization equipment equipped with an oxidation tower that oxidizes the absorbent that has absorbed sulfur oxides and neutralizes unreacted components, the bleed amount detects the amount of absorbent supplied from the absorption tower to the oxidation tower. A detector, a chemical amount detector that detects the amount of chemical supplied to neutralize unreacted components in the oxidation tower, and a PH detector that controls the amount of chemical supplied so that the PH value in the oxidation tower is constant. , and an absorbent supply control device that controls the amount of absorbent supplied to the absorption tower according to the outputs of the bleed amount detector and the chemical amount detector. Since the pH value is controlled within the range of 3 to 5, it is possible to accurately supply chemicals without being affected by impurities in the slurry, and the amount of chemicals supplied from the bleed pipe can be controlled within the slurry that is supplied to the oxidation tower from the bleed pipe. Therefore, the amount of unreacted components in the bled slurry can be determined from the amount of the chemical supplied and the amount of bleed of the slurry supplied to the oxidation tower, and the amount of unreacted components supplied to the absorption tower can be determined accordingly. By controlling the amount of agent, the
This makes it possible to supply the optimal amount of absorbent for desulfurization without measuring PH.
［考案の実施例］
以下、本考案に係る吸収剤の供給装置の好適一
実施例を添付図面に基づいて説明する。[Embodiment of the invention] Hereinafter, a preferred embodiment of the absorbent supply device according to the invention will be described with reference to the accompanying drawings.
第２図は本考案の吸収剤の供給装置を組み込ん
だ湿式排煙脱硫装置を示すもので、脱硫装置自体
の構成は第１図の従来例と同様である。すなわ
ち、図において、１は排ガスダクト、２は吸収
塔、３は循還ポンプ、４はスプレー管、６はブリ
ード管、７は酸化塔、１０は分離機で、排ガスダ
クト１からの排ガスは、吸収塔２内に導入され、
塔２の下部に溜つた吸収剤スラリー５が循還ポン
プ３よりスプレー管４にて噴射循環されることに
より排ガスと吸収剤スラリーとが気液接触し、排
ガス中のイオウ酸化物がスラリーにより吸収除去
される。脱硫後の排ガスは塔２の頂部の出口１７
より排出される。イオウ酸化物を吸収したスラリ
ーはブリード管６から酸化塔７内に供給され、酸
化塔７の下部から供給される空気により酸化され
て石こう化され、またスラリー中の未反応分の吸
収剤は硫酸などの供給管９からの硫酸により石こ
う化される。この石こう化されたスラリーは分離
機１０により固液分離され、石こう１８が回収さ
れると共に液分は母液として管１１を介して吸収
塔２へ戻される。 FIG. 2 shows a wet flue gas desulfurization device incorporating the absorbent supply device of the present invention, and the structure of the desulfurization device itself is the same as the conventional example shown in FIG. That is, in the figure, 1 is an exhaust gas duct, 2 is an absorption tower, 3 is a circulation pump, 4 is a spray pipe, 6 is a bleed pipe, 7 is an oxidation tower, 10 is a separator, and the exhaust gas from the exhaust gas duct 1 is introduced into the absorption tower 2,
The absorbent slurry 5 accumulated at the bottom of the tower 2 is sprayed and circulated from the circulation pump 3 through the spray pipe 4, so that the exhaust gas and the absorbent slurry come into gas-liquid contact, and the sulfur oxides in the exhaust gas are absorbed by the slurry. removed. The exhaust gas after desulfurization is sent to the outlet 17 at the top of the tower 2.
more excreted. The slurry that has absorbed sulfur oxide is supplied from the bleed pipe 6 into the oxidation tower 7, and is oxidized and turned into gypsum by the air supplied from the lower part of the oxidation tower 7. It is gypsumized by sulfuric acid from the supply pipe 9, etc. This gypsum slurry is separated into solid and liquid by the separator 10, and the gypsum 18 is recovered and the liquid component is returned to the absorption tower 2 via the pipe 11 as a mother liquor.
吸収塔２内の吸収剤スラリーとしては消石灰、
生石灰、石灰石なでが使用され、排ガスとの接触
により亜硫酸カルシウムとなるが、一部は未反応
のままブリード管６を介して酸化塔７へ送られ、
そこで酸化反応と中和反応とが同時に行なわれ
る。 The absorbent slurry in the absorption tower 2 includes slaked lime,
Quicklime and limestone shavings are used, and when they come into contact with the exhaust gas, they turn into calcium sulfite, but some of the calcium sulfite is sent unreacted to the oxidation tower 7 via the bleed pipe 6.
There, an oxidation reaction and a neutralization reaction occur simultaneously.
この脱硫装置において、ブリード管６にブリー
ド量（例えば流量）を検出するブリード検出器１
９が設けら、酸化塔７へ硫酸などの中和薬剤を供
給する供給管９に薬剤量検出器２０が設けられ
る。この供給管９からの硫酸などの薬剤供給量は
酸化塔７内のPHを検出するPH検出器２１により制
御され、その出力が薬剤量検出器２０を介して制
御弁２２に入力され、酸化塔７内のPHが３〜５の
範囲となるよう薬剤の注入量が調整される。この
薬剤注入量は吸収剤を石灰石とし、薬剤を硫酸と
した場合、未反応の吸収剤（炭酸カルシウム）と
等モルの硫酸量となるため薬剤量検出器２０での
出力は未反応の吸収剤の量を表わすことになる。 In this desulfurization equipment, a bleed detector 1 for detecting the amount of bleed (for example, flow rate) is installed in the bleed pipe 6.
A chemical amount detector 20 is provided in the supply pipe 9 that supplies a neutralizing agent such as sulfuric acid to the oxidizing tower 7 . The amount of chemicals such as sulfuric acid supplied from this supply pipe 9 is controlled by a PH detector 21 that detects the PH in the oxidation tower 7, and its output is inputted to the control valve 22 via the medicine amount detector 20, and the oxidation tower The injection amount of the drug is adjusted so that the pH within 7 is in the range of 3 to 5. When limestone is used as the absorbent and sulfuric acid is used as the drug, the amount of sulfuric acid injected is equal to the amount of unreacted absorbent (calcium carbonate), so the output from the drug amount detector 20 is the amount of unreacted absorbent (calcium carbonate). It represents the amount of
ブリード量検出器１０の出力及び薬剤検出器２
０の出力は吸収剤供給制御装置２３に入力され、
その出力で吸収剤供給管１２に設けた制御弁２４
が制御される。 Output of bleed amount detector 10 and drug detector 2
The output of 0 is input to the absorbent supply control device 23,
The control valve 24 provided in the absorbent supply pipe 12 uses its output.
is controlled.
以上において、吸収塔２内で排ガス中のイオウ
酸化物と反応した吸収剤スラリーはブリード管６
から酸化塔７に移送れさる。この際ブリード量検
出器１９でその移送量が検出される。酸化塔７内
では吸収反応した吸収剤の酸化反応と未反応の吸
収剤の中和反応とが同時に行なわれ、酸化塔７内
のPHが３〜５の範囲となるようPH検出器２１の出
力でその硫酸などの薬剤の注入量が制御される。
この際薬剤の注入量は薬剤量検出器２０で検出さ
れる。この薬剤量検出器２０とブリード量検出器
１９との出力が吸収剤供給制御装置２３に入力さ
れることにより酸化塔７内に入るスラリー中の未
反応分の濃度が演算され、吸収塔２内の吸収剤ス
ラリーの脱硫率を最適に維持すべく制御弁２４を
制御して適切な量の吸収剤を吸収塔２に供給す
る。 In the above, the absorbent slurry that has reacted with the sulfur oxide in the exhaust gas in the absorption tower 2 is transferred to the bleed pipe 6.
from there to the oxidation tower 7. At this time, the transfer amount is detected by the bleed amount detector 19. In the oxidation tower 7, the oxidation reaction of the absorbed absorbent and the neutralization reaction of the unreacted absorbent are performed simultaneously, and the output of the PH detector 21 is adjusted so that the PH in the oxidation tower 7 is in the range of 3 to 5. The amount of the drug such as sulfuric acid injected is controlled.
At this time, the injection amount of the drug is detected by the drug amount detector 20. By inputting the outputs of the chemical amount detector 20 and the bleed amount detector 19 to the absorbent supply control device 23, the concentration of unreacted components in the slurry entering the oxidation tower 7 is calculated. In order to optimally maintain the desulfurization rate of the absorbent slurry, the control valve 24 is controlled to supply an appropriate amount of absorbent to the absorption tower 2.
尚、上述の実施例においては主に石灰石などの
カルシウム系の吸収剤を使用した場合に例を示し
たが、吸収剤としてカセイソーダを使用するもこ
とできる。この場合、カセイソーダは石灰と違つ
て溶解度が大きいため、吸収塔２には未反応分が
ないよう、すなわち吸収塔２での捕集イオウ酸化
物量より少な目にカセイソーダを吸収塔２に供給
する。このため酸化塔７においては捕集イオウ酸
化物（未反応分）のためにPH値が下がるのでPH検
出器２１でPH値が一定となるよう供給管９からカ
セイソーダを供給し中和反応をさせる。この中和
に要したカセイソーダの量を薬剤量検出器２０で
検出し、同時にブリード管６から酸化塔７へブリ
ードされるスラリーをブリード量検出器１９で検
出し、吸収剤制御装置２４で酸化塔７での中和カ
セイソーダ量が一定となるよう吸収塔２へ供給す
るカセイソーダの量を制御させるように構成す
る。これにより吸収塔２内でPHを検出してカセイ
ソーダ量を制御する必要がないため不純物による
PH値の変化に影響されずに適切な量のカセイソー
ダを吸収塔２に供給することが可能となる。 Incidentally, in the above-mentioned embodiments, an example was shown in which a calcium-based absorbent such as limestone was mainly used, but caustic soda may also be used as the absorbent. In this case, since caustic soda has a high solubility unlike lime, caustic soda is supplied to the absorption tower 2 so that there is no unreacted content in the absorption tower 2, that is, the amount of caustic soda is less than the amount of sulfur oxides collected in the absorption tower 2. For this reason, in the oxidation tower 7, the PH value decreases due to the collected sulfur oxides (unreacted portion), so caustic soda is supplied from the supply pipe 9 to cause a neutralization reaction so that the PH value becomes constant in the PH detector 21. . The amount of caustic soda required for this neutralization is detected by the chemical amount detector 20, and at the same time, the slurry bleed from the bleed pipe 6 to the oxidation tower 7 is detected by the bleed amount detector 19, and the absorbent control device 24 detects the slurry in the oxidation tower. The amount of caustic soda supplied to the absorption tower 2 is controlled so that the amount of neutralized caustic soda in step 7 is constant. This eliminates the need to detect PH in absorption tower 2 and control the amount of caustic soda, so
It becomes possible to supply an appropriate amount of caustic soda to the absorption tower 2 without being affected by changes in PH value.
［考案の効果］
以上詳述してきたことから明らかなように本考
案によれば次のごとき優れた効果を発揮する。[Effects of the Invention] As is clear from what has been described in detail above, the present invention provides the following excellent effects.
(1) 吸収塔から酸化塔へ供給するブリード量を検
出し、また酸化塔で中和に要する薬剤量を検出
し、そのブリード量と薬剤量とで吸収塔へ供給
する吸収剤の量を制御するようにしたので、従
来の吸収塔内のPHに基づいて吸収剤を供給する
のに対し、吸収塔内の不純物によるPH値変化に
影響されずに常に適切な吸収剤の量を供給でき
る。(1) Detect the amount of bleed supplied from the absorption tower to the oxidation tower, and also detect the amount of chemicals required for neutralization in the oxidation tower, and control the amount of absorbent supplied to the absorption tower based on the amount of bleed and the amount of chemicals. This makes it possible to always supply an appropriate amount of absorbent without being affected by changes in PH value due to impurities in the absorption tower, unlike conventional methods in which absorbent is supplied based on the PH inside the absorption tower.
(2) 吸収剤が不純物のPHに影響されずに供給され
るので吸収塔内での脱硫率を最適に維持でき
る。(2) Since the absorbent is supplied without being affected by the pH of impurities, the desulfurization rate within the absorption tower can be maintained at an optimum level.
(3) 酸化塔でのPH制御は低いPH値の範囲で制御す
るため不純物の影響を受けずに中和に必要な薬
剤を供給でき、それに応じて吸収剤を吸収塔に
供給するため吸収塔入口の条件に応じた最適制
御ができ、運転経費の節減が可能になる。(3) Since the PH in the oxidation tower is controlled within a low PH value range, the chemicals necessary for neutralization can be supplied without being affected by impurities, and the absorption tower Optimal control can be performed according to the inlet conditions, making it possible to reduce operating costs.
第１図は従来の湿式排煙脱硫装置を示す図、第
２図は本考案に係る吸収剤の供給装置の一実施例
を示す図である。
図中、２は吸収塔、６はブリード管、７は酸化
塔、９は薬剤供給管、１２は吸収剤供給管、１９
はブリード量検出器、２０は薬剤量検出器、２１
はPH検出器、２３は吸収剤供給制御装置である。
FIG. 1 is a diagram showing a conventional wet flue gas desulfurization device, and FIG. 2 is a diagram showing an embodiment of an absorbent supply device according to the present invention. In the figure, 2 is an absorption tower, 6 is a bleed pipe, 7 is an oxidation tower, 9 is a drug supply pipe, 12 is an absorbent supply pipe, 19
is a bleed amount detector, 20 is a drug amount detector, 21
23 is a PH detector, and 23 is an absorbent supply control device.
Claims (1)
オウ酸化物を吸収除去する吸収塔と、イオウ酸化
物を吸収した吸収剤を酸化すると共に、未反応分
を中和する酸化塔とを備えた湿式排煙脱硫装置に
おいて、上記吸収塔から酸化塔への吸収剤の供給
量を検出するブリード量検出器と酸化塔内の未反
応分を中和する薬剤の供給量を検出する薬剤量検
出器と、酸化塔内のPH値が一定となるよう薬剤の
供給量を制御するPH検出器と上記ブリード量検出
器と薬剤量検出器との出力に応じて吸収塔へ供給
する吸収剤の量を制御する吸収剤供給制御装置と
を備えたことを特徴とする吸収剤の供給装置。 Equipped with an absorption tower that brings exhaust gas into gas-liquid contact with an absorbent to absorb and remove sulfur oxides in the exhaust gas, and an oxidation tower that oxidizes the absorbent that has absorbed the sulfur oxides and neutralizes unreacted components. In a wet flue gas desulfurization system, a bleed amount detector detects the amount of absorbent supplied from the absorption tower to the oxidation tower, and a chemical amount detector detects the amount of medicine supplied to neutralize unreacted components in the oxidation tower. Then, the amount of absorbent supplied to the absorption tower is determined according to the outputs of the PH detector, which controls the amount of chemical supplied so that the PH value in the oxidation tower is constant, and the bleed amount detector and the chemical amount detector. An absorbent supply device comprising: an absorbent supply control device for controlling the absorbent supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2389284U JPS60136726U (en) | 1984-02-23 | 1984-02-23 | Absorbent supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2389284U JPS60136726U (en) | 1984-02-23 | 1984-02-23 | Absorbent supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60136726U JPS60136726U (en) | 1985-09-11 |
| JPH0125627Y2 true JPH0125627Y2 (en) | 1989-08-01 |
Family
ID=30517540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2389284U Granted JPS60136726U (en) | 1984-02-23 | 1984-02-23 | Absorbent supply device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60136726U (en) |
-
1984
- 1984-02-23 JP JP2389284U patent/JPS60136726U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60136726U (en) | 1985-09-11 |
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