JPH02214525A - Treatment of incinerator waste gas - Google Patents
Treatment of incinerator waste gasInfo
- Publication number
- JPH02214525A JPH02214525A JP1035635A JP3563589A JPH02214525A JP H02214525 A JPH02214525 A JP H02214525A JP 1035635 A JP1035635 A JP 1035635A JP 3563589 A JP3563589 A JP 3563589A JP H02214525 A JPH02214525 A JP H02214525A
- Authority
- JP
- Japan
- Prior art keywords
- calcium chloride
- solution
- solid
- separated
- heavy metals
- 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
- 239000002912 waste gas Substances 0.000 title abstract 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000001110 calcium chloride Substances 0.000 claims abstract description 26
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 26
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 23
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 22
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 22
- 239000004571 lime Substances 0.000 claims abstract description 22
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 5
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 239000003352 sequestering agent Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000460 chlorine Substances 0.000 abstract description 3
- 229910052801 chlorine Inorganic materials 0.000 abstract description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 abstract description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 19
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は焼却炉排ガスの処理方法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a method for treating incinerator exhaust gas.
従来の技術
従来、焼却炉排ガスの処理方法は、たとえば反応塔内を
流通する排ガスに処理剤として石灰成分剤を散布し、排
ガス中の塩化水素を石灰成分に反応させることにより塩
化カルシュウムとして固形化し、排ガス中のダストとと
もに分離除去していた。Conventional technology Conventionally, in the treatment of incinerator exhaust gas, for example, a lime component agent is sprayed as a treatment agent into the exhaust gas flowing in a reaction tower, and hydrogen chloride in the exhaust gas is solidified as calcium chloride by reacting with the lime component. It was separated and removed along with the dust in the exhaust gas.
発明が解決しようとする課題
しかし、上記の構成において除去された除去物を、その
状態のままに埋立地等に投棄すれば塩害が生じるので、
除去物から塩化カルシュウムを分離回収する必要があっ
た。また、除去物中には未反応の石灰成分が含まれてお
り、これを回収し、再利用して処理剤の節減を図る必要
があった。Problems to be Solved by the Invention However, if the removed materials removed in the above configuration are dumped in a landfill or the like in that state, salt damage will occur.
It was necessary to separate and recover calcium chloride from the removed material. In addition, the removed material contains unreacted lime components, which must be recovered and reused to save processing agents.
本発明は上記課題を解決するもので、塩化カルシュウム
および未反応の石灰成分を回収することができる焼却炉
排ガスの処理方法を提供することを目的とする。The present invention solves the above problems, and aims to provide a method for treating incinerator exhaust gas that can recover calcium chloride and unreacted lime components.
課題を解決するための手段
上記課題を解決するため仲、本発明は、排ガス中の塩化
水素を石灰成分剤に反応させる焼却炉排ガスの処理方法
において、排ガスから除去された反応生成物を撹拌槽内
の溶解液中に溶解し、この溶解液に重金属封鎖剤を投入
して反応生成物中の重金属を固形化し、第１固液分離装
置によって前記溶解液から重金属を分離し、この重金属
を分離された溶解液を冷却装置により所定温度に冷却し
て溶解液中の塩化カルシュウムを晶析させ、この晶析し
た塩化カルシュウムを溶解液から第２固液分ｉＩ！！装
置により分離し、塩化カルシュウムを分離された溶解液
を石灰成分溶液として回収する構成としたものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a method for treating incinerator exhaust gas in which hydrogen chloride in the exhaust gas is reacted with a lime component agent, in which the reaction products removed from the exhaust gas are transferred to a stirring tank. A heavy metal sequestering agent is added to the solution to solidify the heavy metals in the reaction product, and a first solid-liquid separator separates the heavy metals from the solution. The dissolved solution is cooled to a predetermined temperature using a cooling device to crystallize calcium chloride in the solution, and the crystallized calcium chloride is transferred from the solution to the second solid-liquid fraction iI! ! The device separates calcium chloride, and the solution from which calcium chloride has been separated is recovered as a lime component solution.
作用
上記した構成により、反応生成物から重金属と塩化カル
シュウムと石灰成分のそれぞれが別個に分離されるので
、排ガス中の塩素成分が無害な塩化カルシュウムとして
単独に分離されるとともに、処理剤である石灰成分が回
収される。Effect With the above-mentioned configuration, heavy metals, calcium chloride, and lime components are each separated from the reaction products, so the chlorine component in the exhaust gas is separated separately as harmless calcium chloride, and the processing agent lime is separated. Ingredients are recovered.
実施例
以下本発明の一実施例を図面に基づいて説明する。第１
図において、撹拌槽１には反応生成物排出管２が開口し
ており、この反応生成物排出管２は反応塔及び集塵装置
（いずれも図示せず）に連通している。この反応塔は、
焼却炉から排出される排ガス中に石灰成分Ｃａ（ＯＨ）
２を散布し、排ガス中の塩化水素ＨＣノを石灰成分に反
応させて塩化カルシュウムＣａＣｆ□として固形化する
ものであり、また集塵装置は固形物の大部分を排ガス中
から除去するものである。そして、反応塔及び集塵装置
で除去された反応生成物３が反応生成物排出管２を通っ
て撹拌槽１に排出されるようになされている。また、撹
拌槽１には重金属封鎖剤４（硫化ソーダやキレート剤な
ど）を投入するための薬剤投入管５が開口しており、撹
拌槽１の底部には第１熱交換器６が設けられている。EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a reaction product discharge pipe 2 opens into a stirring tank 1, and this reaction product discharge pipe 2 communicates with a reaction tower and a dust collector (both not shown). This reaction tower is
Lime component Ca(OH) is present in the exhaust gas discharged from the incinerator.
2 is sprayed, and the hydrogen chloride HC in the exhaust gas is reacted with the lime component to solidify it as calcium chloride CaCf□, and the dust collector removes most of the solids from the exhaust gas. . The reaction product 3 removed by the reaction tower and dust collector is discharged into the stirring tank 1 through the reaction product discharge pipe 2. Further, a chemical input pipe 5 for introducing a heavy metal sequestering agent 4 (sodium sulfide, chelating agent, etc.) is opened in the stirring tank 1, and a first heat exchanger 6 is provided at the bottom of the stirring tank 1. ing.
そして、撹拌槽１は第１固液分離装置７に連通しており
、この第１固液分離装置７は固形分ｍｈ出管８と分離液
排出管９を有している。また、分離液排出管９は第２熱
交換器１０を介して冷却塔１１に連通しており、冷却塔
１１には循環管１２が設けられている。そして、循環管
１２には第１循環ポンプ１３が介装されるとともに、第
３熱交換器１４が介装されており、第１循環ポンプ１３
と第３熱交換器■４の間において循環管１２から分岐し
た取出管１５が第２固液分離装置１Ｇに連通している。The stirring tank 1 communicates with a first solid-liquid separator 7, and the first solid-liquid separator 7 has a solid mh outlet pipe 8 and a separated liquid discharge pipe 9. Further, the separated liquid discharge pipe 9 communicates with a cooling tower 11 via a second heat exchanger 10, and the cooling tower 11 is provided with a circulation pipe 12. A first circulation pump 13 is interposed in the circulation pipe 12, and a third heat exchanger 14 is also interposed therein.
A take-out pipe 15 branched from the circulation pipe 12 between the third heat exchanger 4 and the second solid-liquid separator 1G is connected to the second solid-liquid separator 1G.
また、取出管１５には第１１５Ｒ閉弁１７が介装されて
いる。Further, a 115R closing valve 17 is interposed in the extraction pipe 15.
そして、第２・固液分離装置１Ｂは第２固形分排出管１
８と第２分離液排出管１９を有しており、第２分離液排
出管１９は希釈槽２０に連通している。また、希釈槽２
０には希釈水管２１が開口するとともに、撹拌＄！１１
に連通ずる戻り管２２が底部近傍に開口している。そし
て、戻り管２２には第２循環ポンプ２３と第２開閉弁２
４が介装されており、第２循環ポンプ２３と第２開閉弁
２４の間において戻り管２２から排出管２５が分岐して
いる。また排出管２５には第３開閉弁２Ｇが介装されて
いる。そして、第１熱交換器６と第２熱交換器１０と第
３熱交換器１４はコンプレッサー２７に接続されており
、第２熱交換器１ｏと第３熱交換器１４で吸熱するとと
もに、第１熱交換器６で放熱するように形成されている
。したがって、冷却塔１１と第１熱交換器６と第２熱交
換器１０と第３熱交換器１４とコンプレッサー２７とで
冷却装置が形成されている。The second solid-liquid separator 1B has a second solid content discharge pipe 1.
8 and a second separated liquid discharge pipe 19, and the second separated liquid discharge pipe 19 communicates with a dilution tank 20. In addition, dilution tank 2
At 0, the dilution water pipe 21 opens and the stirring $! 11
A return pipe 22 that communicates with is open near the bottom. A second circulation pump 23 and a second on-off valve 2 are connected to the return pipe 22.
4 is interposed, and a discharge pipe 25 branches from the return pipe 22 between the second circulation pump 23 and the second on-off valve 24 . Further, the discharge pipe 25 is provided with a third on-off valve 2G. The first heat exchanger 6, the second heat exchanger 10, and the third heat exchanger 14 are connected to the compressor 27, and the second heat exchanger 1o and the third heat exchanger 14 absorb heat, and the second heat exchanger 10 and the third heat exchanger 14 absorb heat. 1 heat exchanger 6 to radiate heat. Therefore, the cooling tower 11, the first heat exchanger 6, the second heat exchanger 10, the third heat exchanger 14, and the compressor 27 form a cooling device.
以下、上記構成における作用について説明する。The effects of the above configuration will be explained below.
反応生成物３を反応生成物排出管２から撹拌槽１の内部
に貯留された溶解液２Ｂ中に供給する。さらに、この溶
解液２８に重金属封鎖剤４を投入して反応生成物３に含
まれた重金属２９を固形化する。そして、固形化した重
金属２９とともに撹拌槽１の溶解液２８を第１固液分離
装置７に供給し、第１固液分離装置７によって溶解液２
８から重金属２９を分離する。さらに、分離された重金
属２９を固形分排出管８から第１固液分離装置７の外部
に排出するとともに、重金属２９を分離された溶解液２
８を分離液排出管９から冷却塔１１に第２熱交換器ＩＯ
で冷却した後に供給する。そして、冷却塔Ｈに供給され
た溶解液２８を第１循環ポンプ１３により循環管１２を
通って循環させながら第３熱交換器！４によって冷却し
、３０″Ｃ以下に減温して溶解液２８中の塩化カルシュ
ウム３０を晶析させる。さらに、晶析した塩化カルシュ
ウム３０を含む溶解液２８を第１開閉弁１７の開放によ
って取出管１５から第２固液分離装置１６に供給する。The reaction product 3 is supplied from the reaction product discharge pipe 2 into the solution 2B stored inside the stirring tank 1. Further, a heavy metal sequestering agent 4 is added to the solution 28 to solidify the heavy metal 29 contained in the reaction product 3. Then, the dissolved liquid 28 in the stirring tank 1 is supplied together with the solidified heavy metal 29 to the first solid-liquid separator 7.
Heavy metal 29 is separated from 8. Further, the separated heavy metals 29 are discharged from the solid content discharge pipe 8 to the outside of the first solid-liquid separator 7, and the heavy metals 29 are removed from the separated dissolved liquid 2.
8 from the separated liquid discharge pipe 9 to the cooling tower 11 through the second heat exchanger IO.
Supply after cooling. Then, while circulating the solution 28 supplied to the cooling tower H through the circulation pipe 12 by the first circulation pump 13, the third heat exchanger! 4, and the temperature is reduced to below 30"C to crystallize the calcium chloride 30 in the solution 28. Furthermore, the solution 28 containing the crystallized calcium chloride 30 is taken out by opening the first on-off valve 17. It is supplied from the pipe 15 to the second solid-liquid separator 16.
そして、第２固液分離装置１６によって塩化カルシュウ
ム３０を溶解液２８から分離し、分離された塩化カルシ
ュウム３０を第２固形分排出管！８から第２固液分離装
置１６の外部に排出するとともに、塩化カルシュウム３
０を分離された溶解液２８を第２分離液排出管１９から
希釈槽２０に供給し、石灰成分溶液３１として回収する
。そして、回収された石灰成分溶液３Ｉを、希釈水管２
１から供給される希釈水３２によって適度な濃度に希釈
した後に、戻り管２２を通って第２循環ポンプ２３によ
り撹拌槽１に戻し、溶解液２８として補充する。このと
き、第２開閉弁２４と第３開閉弁２６を選択的に開閉す
ることにより、排出管２５から適宜に石灰成分溶液３１
を取り出し、処理剤として再度利用する。Then, the calcium chloride 30 is separated from the solution 28 by the second solid-liquid separator 16, and the separated calcium chloride 30 is transferred to the second solid content discharge pipe! 8 to the outside of the second solid-liquid separator 16, and calcium chloride 3
The solution 28 from which 0 has been separated is supplied from the second separated liquid discharge pipe 19 to the dilution tank 20 and recovered as a lime component solution 31. Then, the recovered lime component solution 3I is transferred to the dilution water pipe 2.
After being diluted to an appropriate concentration with dilution water 32 supplied from 1, it is returned to stirring tank 1 through return pipe 22 by second circulation pump 23 and replenished as solution 28. At this time, by selectively opening and closing the second on-off valve 24 and the third on-off valve 26, the lime component solution 31 is discharged from the discharge pipe 25 as appropriate.
is taken out and reused as a processing agent.
発明の効果
以上述べたように、本発明によれば、反応生成物から重
金属と塩化カルシュウムと石灰成分のそれぞれが別個に
分離されるので、排ガス中の塩素成分を無害な塩化カル
シュウムとして単独に分離することができる。また、処
理剤である石灰成分剤を回収して再度利用することがで
きる。Effects of the Invention As described above, according to the present invention, heavy metals, calcium chloride, and lime components are separately separated from the reaction products, so that the chlorine component in the exhaust gas can be separately separated as harmless calcium chloride. can do. In addition, the lime component agent that is the treatment agent can be recovered and reused.
第１図は本発明の一実施例を示す全体構成図である。
１・・・撹拌槽、３・・・反応生成物、４・・・重金属
封鎖剤、７・・・第１固液分離装置、ｌ！・・・冷却塔
、ＩＥｉ・・・第２固液分離装置、２８・・・溶解液、
２３・・・重金属、３０・・・塩化カルシュウム、３１
・・・石灰成分溶液。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Stirring tank, 3... Reaction product, 4... Heavy metal sequestering agent, 7... First solid-liquid separator, l! ...Cooling tower, IEi...Second solid-liquid separator, 28...Dissolved liquid,
23...Heavy metal, 30...Calcium chloride, 31
...Lime component solution.
Claims (1)
炉排ガスの処理方法において、排ガスから除去された反
応生成物を撹拌槽内の溶解液中に溶解し、この溶解液に
重金属封鎖剤を投入して反応生成物中の重金属を固形化
し、第１固液分離装置によって前記溶解液から重金属を
分離し、この重金属を分離された溶解液を冷却装置によ
り所定温度に冷却して溶解液中の塩化カルシュウムを晶
析させ、この晶析した塩化カルシュウムを溶解液から第
２固液分離装置により分離し、塩化カルシュウムを分離
回収された溶解液を石灰成分溶液として再利用すること
を特徴とする焼却炉排ガスの処理方法。1. In a method for treating incinerator exhaust gas in which hydrogen chloride in the exhaust gas is reacted with a lime component agent, the reaction product removed from the exhaust gas is dissolved in a solution in a stirring tank, and a heavy metal sequestering agent is added to this solution. The heavy metals in the reaction product are solidified, the heavy metals are separated from the solution by a first solid-liquid separator, and the solution from which the heavy metals have been separated is cooled to a predetermined temperature by a cooling device to be added to the solution. The method is characterized by crystallizing calcium chloride, separating the crystallized calcium chloride from the solution using a second solid-liquid separator, and reusing the solution from which calcium chloride has been separated and recovered as a lime component solution. How to treat incinerator exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1035635A JPH02214525A (en) | 1989-02-15 | 1989-02-15 | Treatment of incinerator waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1035635A JPH02214525A (en) | 1989-02-15 | 1989-02-15 | Treatment of incinerator waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02214525A true JPH02214525A (en) | 1990-08-27 |
Family
ID=12447333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1035635A Pending JPH02214525A (en) | 1989-02-15 | 1989-02-15 | Treatment of incinerator waste gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02214525A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5273183A (en) * | 1975-12-16 | 1977-06-18 | Kureha Chem Ind Co Ltd | Removal of hydrogen chloride in exhaust gas |
| JPS5352638A (en) * | 1976-10-25 | 1978-05-13 | Osaka Sanso Kougiyou Kk | Process for refining salt |
| JPS5715886A (en) * | 1980-07-01 | 1982-01-27 | Sumitomo Chem Co Ltd | Method for removing heavy metal in waste water of stack gas treatment |
-
1989
- 1989-02-15 JP JP1035635A patent/JPH02214525A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5273183A (en) * | 1975-12-16 | 1977-06-18 | Kureha Chem Ind Co Ltd | Removal of hydrogen chloride in exhaust gas |
| JPS5352638A (en) * | 1976-10-25 | 1978-05-13 | Osaka Sanso Kougiyou Kk | Process for refining salt |
| JPS5715886A (en) * | 1980-07-01 | 1982-01-27 | Sumitomo Chem Co Ltd | Method for removing heavy metal in waste water of stack gas treatment |
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