JPS6349229A - Wet type stack gas desulfurization apparatus by lime-gypsum process - Google Patents
Wet type stack gas desulfurization apparatus by lime-gypsum processInfo
- Publication number
- JPS6349229A JPS6349229A JP61190932A JP19093286A JPS6349229A JP S6349229 A JPS6349229 A JP S6349229A JP 61190932 A JP61190932 A JP 61190932A JP 19093286 A JP19093286 A JP 19093286A JP S6349229 A JPS6349229 A JP S6349229A
- Authority
- JP
- Japan
- Prior art keywords
- spray
- tank
- liquid
- vessel
- thickener
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010440 gypsum Substances 0.000 title claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 18
- 238000006477 desulfuration reaction Methods 0.000 title claims description 14
- 230000023556 desulfurization Effects 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 10
- 239000007921 spray Substances 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 150000001639 boron compounds Chemical class 0.000 claims abstract description 32
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 239000002562 thickening agent Substances 0.000 claims abstract description 24
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 239000003546 flue gas Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 24
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 15
- 239000000920 calcium hydroxide Substances 0.000 abstract description 15
- 235000011116 calcium hydroxide Nutrition 0.000 abstract description 15
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 15
- 239000000292 calcium oxide Substances 0.000 abstract description 12
- 235000012255 calcium oxide Nutrition 0.000 abstract description 12
- VLCLHFYFMCKBRP-UHFFFAOYSA-N tricalcium;diborate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]B([O-])[O-].[O-]B([O-])[O-] VLCLHFYFMCKBRP-UHFFFAOYSA-N 0.000 abstract description 7
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 abstract description 4
- 235000010261 calcium sulphite Nutrition 0.000 abstract description 4
- 239000011575 calcium Substances 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- OGGXGZAMXPVRFZ-UHFFFAOYSA-N dimethylarsinic acid Chemical compound C[As](C)(O)=O OGGXGZAMXPVRFZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 6
- 239000007787 solid Substances 0.000 description 4
- 239000003595 mist Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011508 lime plaster Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- -1 boric acid compound Chemical class 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- OOYGSFOGFJDDHP-KMCOLRRFSA-N kanamycin A sulfate Chemical group OS(O)(=O)=O.O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N OOYGSFOGFJDDHP-KMCOLRRFSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は排ガス中のホウ素化合物を６青とともに回収す
るようにした湿式石灰石膏法排煙脱硫装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wet lime gypsum method flue gas desulfurization device that recovers boron compounds in flue gas together with 6 blue.
［従来の技術］
たとえば、ガラス工場のガラス溶融炉等からの排ガス中
には、ガス状又は固体形状でホウ素化合物が含まれてい
る。[Prior Art] For example, exhaust gas from a glass melting furnace in a glass factory contains boron compounds in gaseous or solid form.
従来、かかる排ガスを湿式で脱硫させる装置としては、
第２図に示す如き構成のものがある。Conventionally, the equipment for wet desulfurization of exhaust gas is as follows:
There is a configuration as shown in FIG.
すなわら、スプレー塔１、循環槽２、シックナ３、脱水
機４、煙突５を設置し、スプレー塔１は、下部に未処理
ガスの入口管６を、上部に吸収液スプレー装置７、ミス
トエリミネータ８、エリミネータ洗浄スプレー装置９を
それぞれ備え、又、スプレー塔１と循環槽２とは、吸収
液配管１０及び循環ポンプ１１とスプレー装置７との接
続によって連絡し、循環ポンプ１１により循環される吸
収液をスプレー装置７より噴出して入口管６よりスプレ
ー塔１に入る未処理カスと接触させて脱硫作用を行わせ
ると共に未処理ガスの冷却を行うようにし、処理ガスは
ミストエリミネータ８でミストを除去されクリーンガス
として煙道より煙突５に導かれて大気へ放出される。一
方、吸収液に吸収されたＳＯｘ、ホウ素化合物は、吸収
液配管１０より循環槽２へ導かれて循環されるようにし
である。循環槽２には、ｐｔ−＋計１２がおり、該ｐｉ
−１計１２により調整されるバルブ１３を介して生石灰
又は消石灰が供給されるようライン１４が接続されてい
る。又、循環槽２とシックナ３とは、循環槽２内の水溶
液をシックナ３に送るライン１５と、シックナ３でオー
バーフローした液を循環槽２に戻すライン１６とで連絡
し、更に、シックナ３と脱水機（分離機）４とは、シッ
クナ３での濃縮物を脱水機４に送るライン１７と、脱水
機４で分離された炉液をシックナ３に戻すライン１８と
で連絡し、脱水機４で脱水された固形分は石膏として回
収できるようにしである。１９は攪拌機である。That is, a spray tower 1, a circulation tank 2, a thickener 3, a dehydrator 4, and a chimney 5 are installed. An eliminator 8 and an eliminator cleaning spray device 9 are respectively provided, and the spray tower 1 and the circulation tank 2 are connected through an absorption liquid piping 10, a circulation pump 11, and a spray device 7, and are circulated by the circulation pump 11. The absorption liquid is ejected from the spray device 7 and brought into contact with the untreated waste entering the spray tower 1 from the inlet pipe 6 to perform a desulfurization action and to cool the untreated gas, and the treated gas is misted by the mist eliminator 8. is removed and guided as clean gas through the flue to the chimney 5 and released into the atmosphere. On the other hand, SOx and boron compounds absorbed by the absorption liquid are guided to the circulation tank 2 through the absorption liquid piping 10 and circulated therein. There is a pt-+ total 12 in the circulation tank 2, and the pi
A line 14 is connected so that quicklime or slaked lime is supplied through a valve 13 regulated by a total of -1 12. Further, the circulation tank 2 and the thickener 3 are connected by a line 15 that sends the aqueous solution in the circulation tank 2 to the thickener 3, and a line 16 that returns the overflowing liquid in the thickener 3 to the circulation tank 2. The dehydrator (separator) 4 is connected to the dehydrator 4 by a line 17 that sends the concentrate from the thickener 3 to the dehydrator 4, and a line 18 that returns the furnace liquid separated by the dehydrator 4 to the thickener 3. The solid content dehydrated can be recovered as gypsum. 19 is a stirrer.
上記従来の湿式石灰石膏法排煙脱硫装置では、スプレー
塔１で吸収液に吸収されたＳＯｘとホウ素化合物は循環
槽２内でｐｔ−＋計１２にて調整されて投入される生石
灰又は消石灰と反応させるようにしである。In the above-mentioned conventional wet lime plaster method flue gas desulfurization equipment, the SOx and boron compounds absorbed by the absorption liquid in the spray tower 1 are mixed with quicklime or slaked lime which is adjusted in pt-+ total 12 in the circulation tank 2 and is added. It is meant to react.
［発明が解決しようとする問題点］
ところが、上記従来の湿式石灰石膏法排煙脱硫装置では
、ホウ素化合物を石膏とともに回収できるようにするた
め、循環槽２でホウ素化合物を結晶化させるようｐＨを
高くしておるので、ＳＯｘは生石灰又は消石灰と反応し
て石膏又は亜硫酸カルシウムとなり、ホウ素化合物は生
石灰又は消石灰との反応でｐｉ−１が高いためホウ酸カ
ルシウムとなり結晶化するが、反面、このような叶１の
高い溶液をスプレー塔内を循環させることになるため、
スプレー塔１内でホウ素化合物が付着して硬化し、たた
いても落らないようなスケーリングを発生すると共に、
ホウ素化合物が吸収液中に溶は込み流れるためスプレー
塔以外の機器類及び配管内部をもスケーリングさせてい
る。又、循環槽２のｐＨを低くしたままでは、ホウ素化
合物はホウ酸塩になりスケーリングが発生しにくくなる
が、シックナ３を経由して脱水機４に導かれて脱水させ
たとしても、ホウ酸塩の状態のため脱水機４での回収が
できない。その結果、脱水機４のろ液とともにシックナ
３を経て再び系内に入り、徐々に濃度が高まることによ
り塔内及びその付属機器にホウ素化合物のスケーリング
が発生して来る。[Problems to be Solved by the Invention] However, in the conventional wet lime gypsum method flue gas desulfurization equipment described above, in order to be able to recover boron compounds together with gypsum, the pH is adjusted to crystallize the boron compounds in the circulation tank 2. SOx reacts with quicklime or slaked lime to form gypsum or calcium sulfite, and boron compounds crystallize into calcium borate due to their high pi-1 when reacting with quicklime or slaked lime. Since a solution with a high concentration of Nano 1 will be circulated within the spray tower,
In the spray tower 1, the boron compound adheres and hardens, causing scaling that cannot be removed even by tapping.
Since boron compounds dissolve and flow into the absorption liquid, equipment other than the spray tower and the inside of the pipes are also scaled. Furthermore, if the pH of the circulation tank 2 is kept low, boron compounds turn into borates, making it difficult for scaling to occur. Due to the state of the salt, it cannot be recovered by the dehydrator 4. As a result, the boron compound enters the system again through the thickener 3 together with the filtrate from the dehydrator 4, and its concentration gradually increases, causing scaling of the boron compound inside the column and its auxiliary equipment.
このようにホウ素化合物を含む排ガスの湿式脱硫装置で
は、ホウ素化合物のスケーリングのため長期間の運転が
できず実用化が困難であるのが現状である。As described above, wet desulfurization equipment for exhaust gas containing boron compounds cannot be operated for a long period of time due to scaling of the boron compounds, making it difficult to put them into practical use.
そこで、本発明は、スプレー塔に循環させる吸収液中の
ホウ素化合物はスケーリングの発生しにくいものとし、
シックナを経由して脱水機で脱水して回収するときは結
晶化させて回収できるようにして排煙脱硫装置内でのホ
ウ素化合物によるスケーリングを少なくし運転ライフを
長くしようとするものである。Therefore, in the present invention, the boron compound in the absorption liquid circulated to the spray tower is made to be less likely to cause scaling.
When dewatering and recovering via a thickener and a dehydrator, it is possible to crystallize and recover, thereby reducing scaling caused by boron compounds in the flue gas desulfurization equipment and extending the operating life.
［問題点を解決するための手段］
本発明は、上記目的を達成するために、冷却、吸収を兼
務したスプレー塔、吸収液の槽、シックナ、脱水機を備
えた湿式石灰石膏法排煙脱硫装置において、上記吸収液
の槽を、スプレー循環槽とホウ酸塩の調整槽とに分け、
スプレー循環槽はｐ）−１を低くしてＳＯｘの吸収、ホ
ウ素水溶液調整、循環スプレー用とし、上記調整槽は、
ｐＨを高くしてホウ酸塩をホウ酸カルシウム、又は消石
灰の不溶解粒子を核とした粒子の大きなホウ酸化合物を
生成させるようにし、且つ上記調整槽とシックナとを送
液ラインで連絡さけ、上記スプレー循環槽から吸収液が
上記調整槽へ送られるようにした構成としである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a wet lime gypsum method flue gas desulfurization system equipped with a spray tower serving both cooling and absorption, an absorption liquid tank, a thickener, and a dehydrator. In the device, the absorption liquid tank is divided into a spray circulation tank and a borate adjustment tank,
The spray circulation tank has a low p)-1 and is used for SOx absorption, boron aqueous solution adjustment, and circulation spray, and the adjustment tank is
The pH is increased so that the boric acid salt is formed into calcium borate, or a boric acid compound with large particles whose core is insoluble particles of slaked lime, and the adjustment tank and the thickener are connected through a liquid feeding line, The structure is such that the absorption liquid is sent from the spray circulation tank to the adjustment tank.
［作 用］
スプレー循環槽では、吸収液に吸収されたＳＯｘはｐＨ
計にて調整されて投入される生石灰又は消石灰と反応し
て石膏又は亜硫酸カルシウムとなり、ホウ素化合物は水
溶性ホウ酸塩となる。調整槽は、スプレー循環槽からの
吸収液を溜め、これに高い値としたｐＨ−１計にて調整
されて投入される生石灰又は消石灰を反応させてホウ酸
塩をホウ酸カルシウムに、又は消石灰の不溶解粒子を核
とした粒子の大きなホウ素化合物を生成する。これによ
りホウ素化合物は回収できる大きさとなり脱水機で回収
される。[Function] In the spray circulation tank, the SOx absorbed by the absorption liquid has a pH value of
It reacts with quicklime or slaked lime, which is adjusted and added in a meter, to become gypsum or calcium sulfite, and the boron compound becomes water-soluble borate. The adjustment tank stores the absorption liquid from the spray circulation tank, and reacts it with quicklime or slaked lime, which is adjusted with a high pH-1 meter and turned into calcium borate or slaked lime. A boron compound with large particles is produced with undissolved particles as the nucleus. As a result, the boron compound becomes large enough to be recovered and is recovered in a dehydrator.
［実 施 例］ 以下、本発明の実施例を図面を参照して説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図に示す如く、第２図に示す従来方式と同様な構成
としたスプレー塔１、シックナ３、脱水１５１４、煙突
５を設置し、且つ従来方式と同様にスプレー塔１では吸
収液を循環させるようにすると共に、吸収液をシックナ
３を経由して脱水機４に導き、脱水機４のが液をシック
ナ３を経由させて再び系内に戻すようにしである湿式石
灰石膏法排煙脱硫装置において、スプレー塔１からの吸
収液を溜めて循環させるためのスプレー循環槽２０と、
吸収液中のホウ素化合物を結晶化させるための調整ｐＪ
２１とを設け、上記両槽２０．２１には生石灰又は消
石灰を供給するライン２２．２３を分岐させて設け、両
ライン２２．２３に各々バルブ２４．２５を設けて、バ
ルブ２４はスプレー循環槽２０に設けたｐト＋計２６に
より調整され、バルブ２５は調整槽２１に設けたｐ）ｌ
計２７により調整されるようにする。又、調整槽２１と
シックナ３とは送液管１５で連絡し、該送液管１５の途
中に設けたバルブ２８を、調整槽２１に設けた液面計２
９により調節するようにし、一定の液位に達すると、調
整槽２１内の液をシックナ３に送るようにしである。又
、シックナ３でオーバーフローした液はスプレー循環槽
２０に戻すようにしである。As shown in Fig. 1, a spray tower 1, a thickener 3, a dehydrator 1514, and a chimney 5 are installed, which have the same configuration as the conventional system shown in Fig. 2, and the absorption liquid is circulated in the spray tower 1 as in the conventional system. At the same time, the absorbent liquid is introduced to the dehydrator 4 via the thickener 3, and the liquid from the dehydrator 4 is passed through the thickener 3 and returned to the system. In the apparatus, a spray circulation tank 20 for storing and circulating the absorption liquid from the spray tower 1;
Adjustment pJ for crystallizing boron compounds in absorption liquid
21, both tanks 20.21 are provided with lines 22.23 for supplying quicklime or slaked lime, and both lines 22.23 are provided with valves 24.25, respectively, and the valve 24 is a spray circulation tank. The valve 25 is adjusted by the p)l meter 26 provided in the adjustment tank 21.
It is adjusted by a total of 27. Further, the adjustment tank 21 and the thickener 3 are connected through a liquid feed pipe 15, and a valve 28 provided in the middle of the liquid feed pipe 15 is connected to a liquid level gauge 2 provided in the adjustment tank 21.
9, and when the liquid level reaches a certain level, the liquid in the adjustment tank 21 is sent to the thickener 3. Further, the liquid overflowing from the thickener 3 is returned to the spray circulation tank 20.
その他の構成は第２図に示した従来のものと同じであり
、同一のものには同一符号が付しである。The rest of the structure is the same as the conventional one shown in FIG. 2, and the same parts are given the same reference numerals.
Ｓｏｗ及びホウ素化合物を含んだ未処理ガスは、スプレ
ー塔１に入って循環吸収液と接触して冷却、増湿、吸収
される。処理されたガスは、スプレー塔１内のミストエ
リミネータ８でミストを除去された後、クリーンガスと
して煙突より大気へ放出される。The untreated gas containing sow and boron compounds enters the spray tower 1 and is cooled, humidified and absorbed by contacting the circulating absorption liquid. After the treated gas has its mist removed by a mist eliminator 8 in the spray tower 1, it is released into the atmosphere from a chimney as clean gas.
吸収液に吸収されたＳＯｘは、ｐＨ＝３〜５にしである
スプレー循環槽２０にてｐＨ計２６にて調整されて供給
された生石灰又は消石灰と反応して石膏又は亜硫酸カル
シウムとなり、又、吸収液に吸収されたホウ素化合物は
、水溶性ホウ酸塩となる。この場合、スプレー循環槽２
０のｐ）ｌが低くしであるので、ホウ素化合物はスケー
リングの起きにくいホウ酸塩の状態になっており、又、
上記のｐＨでＳＯｘは十分吸収できることは周知の事実
である。これによりスプレー循環槽２０内の液をスプレ
ー塔１に循環させた場合に、スプレー塔１内のスケーリ
ングは僅かになり、スプレー塔１の運転ライフを著しく
延長させることが可能となる。The SOx absorbed in the absorption liquid reacts with quicklime or slaked lime supplied after being adjusted with a pH meter 26 in a spray circulation tank 20 with a pH of 3 to 5, and becomes gypsum or calcium sulfite. The boron compound absorbed into the liquid becomes a water-soluble borate. In this case, spray circulation tank 2
Since p)l of 0 is low, the boron compound is in the borate state where scaling is difficult to occur, and
It is a well-known fact that SOx can be sufficiently absorbed at the above pH. As a result, when the liquid in the spray circulation tank 20 is circulated to the spray tower 1, scaling within the spray tower 1 becomes slight, and the operating life of the spray tower 1 can be significantly extended.
スプレー循環槽２０からオーバーフロー又はポンプにて
送られた吸収液は、調整槽２１に溜められる。調整槽２
１ではｐＨ＝６〜７にしであるため、スプレー循環槽２
０からのホウ酸塩は叶１計２７で調整されて供給される
生石灰又は消石灰と反応してホウ酸カルシウムになり、
又、生石灰又は消石灰の不溶解粒子を咳とした粒子の大
ぎなホウ素化合物が生成される。すなわち、ホウ酸塩は
ｐＨを６〜７に上げると次のように反応し、ホウ素
２Ｈ３ＢＯ３＋ ３Ｃａ （ＯＨ）２−＋Ｃａｘ（Ｂ
Ｏｓ−）２↓＋６Ｈ２０２ＨＢＯ２＋Ｃａ （ｏｌ−＋
）２−＋ｃａｓ２ｏ４−２１１２０調整槽２１で得られ
る上記ホウ酸カルシウム又はホウ素化合物は粒子が大き
く、脱水機４で回収することができる。The overflow from the spray circulation tank 20 or the absorption liquid sent by the pump is stored in the adjustment tank 21 . Adjustment tank 2
1, the pH is between 6 and 7, so the spray circulation tank 2
The borate from 0 reacts with quicklime or slaked lime, which is adjusted and supplied in Kano 1 total 27, and becomes calcium borate.
In addition, large-particle boron compounds are produced using undissolved particles of quicklime or slaked lime. That is, when the pH of borate is raised to 6-7, it reacts as follows, forming boron 2H3BO3+ 3Ca(OH)2-+Cax(B
Os-)2↓+6H202HBO2+Ca (ol-+
)2-+cas2o4-21120 The calcium borate or boron compound obtained in the adjustment tank 21 has large particles and can be recovered in the dehydrator 4.
調整槽２１内の溶液は、一定のレベルに達すると、液面
計２９の指示によりシックナ３へ送液され、ここで濃縮
されて脱水機４へ送られ、石膏、ホウ酸カルシウム等の
固形分は回収される。図中３０が回収固形分である。When the solution in the adjustment tank 21 reaches a certain level, it is sent to the thickener 3 according to the instructions from the liquid level gauge 29, where it is concentrated and sent to the dehydrator 4, where it removes solids such as gypsum and calcium borate. will be collected. 30 in the figure is the recovered solid content.
脱水機４の炉液はシックナ３に戻され、シックナ３のオ
ーバーフロー液はスプレー循環槽２０に戻される。Furnace liquid from the dehydrator 4 is returned to the thickener 3, and overflow liquid from the thickener 3 is returned to the spray circulation tank 20.
［発明の効果］
以上述べた如く、本発明の湿式石灰石膏法俳煙脱硫装置
によれば、吸収液の漕をスプレー循環槽と調整槽として
設置し、スプレー循環槽はｐＨを低くしてホウ素化合物
を結晶化させないようにし、調整槽はｐ＋−＋を高くし
てホウ素化合物を結晶化させるようにし、上記スプレー
循環槽内の吸収液をスプレー塩に循環させるようにしで
あるので、スプレー塔内のホウ素化合物によるスケーリ
ングが少なくなってスプレー塩の清掃の回数が減ると共
にスプレー塩の運転ライフを著しく延長させることがで
き、又、スプレー塔以外の機器類をスケーリングさせる
ことも少なくなり、しかも、シックナへ送られる溶液中
のホウ素化合物は大きい粒子に結晶化されているので石
膏とともに容易にホウ素化合物を回収することができる
、という優れた効果を奏し得る。[Effects of the Invention] As described above, according to the wet lime plaster method smoke desulfurization apparatus of the present invention, the absorption liquid tank is installed as a spray circulation tank and an adjustment tank, and the spray circulation tank lowers the pH and absorbs boron. In order to prevent the compound from crystallizing, the adjustment tank has a high p + - + to crystallize the boron compound, and the absorption liquid in the spray circulation tank is circulated to the spray salt, so that the inside of the spray tower is Scaling caused by boron compounds in the spray salt is reduced, reducing the number of times the spray salt must be cleaned and significantly extending the operating life of the spray salt.In addition, scaling of equipment other than the spray tower is reduced, and thickeners are reduced. Since the boron compounds in the solution sent to the gypsum are crystallized into large particles, the boron compounds can be easily recovered together with the gypsum, which is an excellent effect.
第１図は本発明の湿式石灰石膏法排煙脱硫装置の概要を
示す図、第２図は従来の湿式石灰石壽法排煙脱硫装置の
概要を示す図である。
１・・・スプレー塩、２・・・循環槽、３・・・シック
ナ、４・・・脱水機、１１・・・循環ポンプ、２０・・
・スプレー循環槽、２１・・・調整槽、２２．２３・・
・生石灰又は消石灰供給ライン、２６．２７・・・ｐ）
ｌ計、２９・・・液面計。FIG. 1 is a diagram showing an outline of a wet limestone gypsum method flue gas desulfurization device of the present invention, and FIG. 2 is a diagram showing an outline of a conventional wet limestone gypsum method flue gas desulfurization device. 1...Spray salt, 2...Circulation tank, 3...Thickener, 4...Dehydrator, 11...Circulation pump, 20...
・Spray circulation tank, 21...Adjustment tank, 22.23...
・Quicklime or slaked lime supply line, 26.27...p)
l meter, 29...liquid level gauge.
Claims (1)
ックナ、脱水機を備えた湿式石灰石膏法排煙脱硫装置に
おいて、上記吸収液の槽を、スプレー循環槽とホウ酸塩
の調整槽とに分け、上記スプレー循環槽を、ｐＨを低く
してＳＯｘの吸収、ホウ素水溶液の調整用の槽として、
該槽内の吸収液をスプレー塔へ循環させるようにし、又
、上記調整槽を、ｐＨを高くしてホウ酸塩を粒子の大き
いホウ素化合物にする槽として、該調整槽を送液ライン
でシツクナに連絡すると共に、スプレー循環槽から吸収
液を受け入れるようにしたことを特徴とする湿式石灰石
膏法排煙脱硫装置。1) In a wet lime gypsum method flue gas desulfurization equipment equipped with a spray tower that also serves as a cooling and absorption tank, an absorbent tank, a thickener, and a dehydrator, the absorbent tank is replaced by a spray circulation tank and a borate adjustment tank. The spray circulation tank is used as a tank for absorbing SOx and adjusting the boron aqueous solution by lowering the pH.
The absorption liquid in the tank is circulated to the spray tower, and the adjustment tank is used as a tank to increase the pH and convert borate into a boron compound with large particles, and the adjustment tank is connected to a liquid feed line. A wet lime gypsum method flue gas desulfurization device, characterized in that it is configured to communicate with a spray circulation tank and to receive an absorbing liquid from a spray circulation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61190932A JPS6349229A (en) | 1986-08-14 | 1986-08-14 | Wet type stack gas desulfurization apparatus by lime-gypsum process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61190932A JPS6349229A (en) | 1986-08-14 | 1986-08-14 | Wet type stack gas desulfurization apparatus by lime-gypsum process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6349229A true JPS6349229A (en) | 1988-03-02 |
Family
ID=16266082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61190932A Pending JPS6349229A (en) | 1986-08-14 | 1986-08-14 | Wet type stack gas desulfurization apparatus by lime-gypsum process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6349229A (en) |
-
1986
- 1986-08-14 JP JP61190932A patent/JPS6349229A/en active Pending
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