JPH0568851A - Method and equipment for removing hydrogen chloride - Google Patents
Method and equipment for removing hydrogen chlorideInfo
- Publication number
- JPH0568851A JPH0568851A JP3233511A JP23351191A JPH0568851A JP H0568851 A JPH0568851 A JP H0568851A JP 3233511 A JP3233511 A JP 3233511A JP 23351191 A JP23351191 A JP 23351191A JP H0568851 A JPH0568851 A JP H0568851A
- Authority
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- Prior art keywords
- dust
- reactant
- exhaust gas
- temperature water
- slurry
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ごみ焼却排ガスに含ま
れる塩化水素を効率良く吸着除去する塩化水素除去方法
およびその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen chloride removal method and apparatus for efficiently adsorbing and removing hydrogen chloride contained in waste incineration exhaust gas.
【０００２】[0002]
【従来の技術】従来、ごみ焼却排ガスに含まれる塩化水
素を除去する塩化水素除去装置として乾式、半乾式、湿
式等があり、焼却排ガス中に粉末やスラリー状の消石灰
を噴射して生成した塩を電気集塵機（以下ＥＰと称す）
またはバグフィルターで除去している。2. Description of the Related Art Conventionally, there are dry type, semi-dry type, wet type, etc. as a hydrogen chloride removing device for removing hydrogen chloride contained in waste incineration exhaust gas. An electrostatic precipitator (hereinafter referred to as EP)
Or it is removed by a bug filter.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記した従来
の構成においては、 Ｃａ（ＯＨ）2 ＋２ＨＣｌ→ＣａＣｌ2 ＋２Ｈ2 Ｏ の反応が生成するが、反応過程において未反応のＣａ
（ＯＨ）2 の表面にＣａＣｌ2 の被膜が形成され、Ｃａ
Ｃｌ2 の内部移動速度が遅いために、ＣａＣｌ2 に覆わ
れたＣａ（ＯＨ）2 が未反応のまま排出されてしまい、
十分な反応効率が得られず、余分にＣａ（ＯＨ）2 を噴
霧せねばならない問題があった。However, in the above-described conventional structure, a reaction of Ca (OH) 2 + 2HCl → CaCl 2 + 2H 2 O is produced, but unreacted Ca is not formed in the reaction process.
A CaCl 2 film is formed on the surface of (OH) 2 ,
Since the internal migration speed of Cl 2 is slow, Ca (OH) 2 covered with CaCl 2 is discharged unreacted,
There was a problem that sufficient reaction efficiency could not be obtained and Ca (OH) 2 had to be additionally sprayed.
【０００４】本発明は上記課題を解決するものであり、
消石灰を無駄なく効率よく反応させて消石灰の消費量を
低減することができる塩化水素除去方法およびその装置
を提供することを目的とする。The present invention is intended to solve the above problems,
An object of the present invention is to provide a method for removing hydrogen chloride and an apparatus therefor capable of efficiently reacting slaked lime without waste and reducing the consumption of slaked lime.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明の塩化水素除去方法は、塩化水素を含む排ガ
ス中に粉末もしくはスラリー状の消石灰を反応剤として
噴霧し、反応生成物および未反応の反応剤を含むダスト
を集塵器で捕捉し、捕捉したダストを高温水で溶解し、
ダスト中のＣａＣｌ2 を水相に移行させて固相のＣａ
（ＯＨ）2 と分離し、分離した固相のＣａ（ＯＨ）2 を
再度反応剤として排ガス中に噴霧する構成としたもので
ある。In order to solve the above-mentioned problems, the method for removing hydrogen chloride of the present invention comprises spraying slaked lime in the form of powder or slurry into an exhaust gas containing hydrogen chloride as a reaction product to obtain a reaction product and Dust containing unreacted reactant was captured by a dust collector, and the captured dust was dissolved in high temperature water,
CaCl 2 in the dust is transferred to the aqueous phase and solid phase Ca
(OH) 2 is separated, and the separated solid phase Ca (OH) 2 is sprayed again into the exhaust gas as a reactant.
【０００６】本発明の塩化水素除去装置は、排ガスが流
入する反応塔と、反応塔内に粉末もしくはスラリー状の
消石灰を噴霧する反応剤噴霧装置と、反応塔の下流側に
連通して設けられた集塵器と、集塵器から排出されるダ
ストを溶解するための高温水槽と、高温水槽から取り出
した混合液を固液分離する固液分離装置と、固液分離装
置で分離された脱水ケーキを粉末化もしくはスラリー化
して反応塔に噴霧する反応剤再生装置とを備えた構成と
したものである。The hydrogen chloride removing device of the present invention is provided in communication with a reaction tower into which exhaust gas flows, a spraying device for spraying slaked lime powder or slurry into the reaction tower, and a downstream side of the reaction tower. Dust collector, a high-temperature water tank for dissolving the dust discharged from the dust collector, a solid-liquid separation device that separates the mixed liquid taken out from the high-temperature water tank into solid-liquid separation, and dehydration separated by the solid-liquid separation device It is configured to have a reactant regenerator for pulverizing or slurrying the cake and spraying it on the reaction tower.
【０００７】[0007]
【作用】上記した方法の構成は、Ｃａ（ＯＨ）2 が高温
になるほど水に溶解し難く、ＣａＣｌ2 が高温域におい
て高い溶解性を示す特性を利用するものである。The structure of the above method utilizes the characteristic that Ca (OH) 2 is less likely to dissolve in water as the temperature becomes higher, and CaCl 2 exhibits high solubility in a high temperature range.
【０００８】排ガス中に噴霧された反応剤としてのＣａ
（ＯＨ）2 は排ガス中のＨＣｌと反応してＣａＣｌ2 を
生成する。そして、反応がＣａ（ＯＨ）2 の粒子の表面
において起こるので、生成したＣａＣｌ2 によってＣａ
（ＯＨ）2 の粒子の表面が被覆された状態となり、Ｃａ
Ｃｌ2 の内部移動速度が遅いために未反応のＣａ（Ｏ
Ｈ）2 がダストとして集塵器で捕捉される。この捕捉さ
れたダストを高温水中に投入すると、未反応のＣａ（Ｏ
Ｈ）2 の表面を覆ったＣａＣｌ2 が水相に移行し、固相
のＣａ（ＯＨ）2 の表面からＣａＣｌ2 が分離される。Ca as a reactant sprayed in the exhaust gas
(OH) 2 reacts with HCl in the exhaust gas to produce CaCl 2 . Then, since the reaction occurs on the surface of the Ca (OH) 2 particles, the generated CaCl 2 causes Ca
The surface of the (OH) 2 particles is covered, and Ca
Due to the slow internal migration rate of Cl 2 , unreacted Ca (O
H) 2 is captured by the dust collector as dust. When the captured dust is put into high temperature water, unreacted Ca (O
CaCl 2 covering the surface of H) 2 is transferred to the aqueous phase, and CaCl 2 is separated from the surface of Ca (OH) 2 in the solid phase.
【０００９】したがって、ダストが溶解した混合液を固
液分離することにより未反応のＣａ（ＯＨ）2 が回収で
きるので、回収したＣａ（ＯＨ）2 を再度反応剤として
排ガス中に噴霧することによってＣａ（ＯＨ）2 の反応
効率を高めることができ、結果としてＣａ（ＯＨ）2 の
総消費量を抑制することができる。Therefore, since unreacted Ca (OH) 2 can be recovered by solid-liquid separation of the mixed solution in which the dust is dissolved, the recovered Ca (OH) 2 can be sprayed again into the exhaust gas as a reactant. The reaction efficiency of Ca (OH) 2 can be increased, and as a result, the total consumption of Ca (OH) 2 can be suppressed.
【００１０】上記した装置の構成によれば、反応塔内に
排ガスを導くとともに、反応剤噴霧装置から反応剤とし
てＣａ（ＯＨ）2 を噴霧する。反応塔内に噴霧されたＣ
ａ（ＯＨ）2 は排ガス中のＨＣｌと反応し、生成したＣ
ａＣｌ2 がＣａ（ＯＨ）2 の粒子の表面を被覆する。こ
のとき、ＣａＣｌ2 の内部移動速度が遅いので、未反応
のＣａ（ＯＨ）2 は排ガスとともに反応塔の下流側に連
通する集塵器に流入し、集塵器においてダストとして捕
捉する。According to the above apparatus configuration, the exhaust gas is introduced into the reaction tower, and Ca (OH) 2 is sprayed as the reactant from the reactant spraying device. C sprayed into the reaction tower
a (OH) 2 reacts with HCl in the exhaust gas to form C
aCl 2 coats the surface of the Ca (OH) 2 particles. At this time, since the internal moving speed of CaCl 2 is slow, unreacted Ca (OH) 2 flows into the dust collector communicating with the exhaust gas on the downstream side of the reaction tower and is captured as dust in the dust collector.
【００１１】そして、捕捉したダストを高温水槽に投入
し、高温水中にダストを溶解する。このとき、Ｃａ（Ｏ
Ｈ）2 は高温になるほど水に溶解し難く、ＣａＣｌ2 は
高温域において高い溶解性を示すので、未反応のＣａ
（ＯＨ）2 の表面を覆ったＣａＣｌ2 が水相に移行し、
固相のＣａ（ＯＨ）2 の表面からＣａＣｌ2 が分離され
る。さらに、高温水槽の混合液を固液分離装置に導き、
ＣａＣｌ2 が溶解した分離液と、固相のＣａ（ＯＨ）2
を含む脱水ケーキとに分離して未反応のＣａ（ＯＨ）2
を回収する。また、脱水ケーキを反応剤再生装置におい
て粉末もしくはスラリー化し、再度反応塔に反応剤とし
て噴霧する。Then, the captured dust is put into a high temperature water tank to dissolve the dust in high temperature water. At this time, Ca (O
H) 2 is less soluble in water at higher temperatures, and CaCl 2 is highly soluble in the high temperature range, so unreacted Ca
CaCl 2 covering the surface of (OH) 2 is transferred to the aqueous phase,
CaCl 2 is separated from the surface of solid phase Ca (OH) 2 . Furthermore, the mixed liquid in the high temperature water tank is introduced to the solid-liquid separation device,
Separated solution in which CaCl 2 is dissolved and solid phase Ca (OH) 2
Unreacted Ca (OH) 2 separated into a dehydrated cake containing
To collect. In addition, the dehydrated cake is made into powder or slurry in the reactant regenerator and sprayed again as a reactant on the reaction tower.
【００１２】したがって、未反応のＣａ（ＯＨ）2 を回
収して再度反応剤として排ガス中に噴霧することによっ
てＣａ（ＯＨ）2 の反応効率を高めてＣａ（ＯＨ）2 の
総消費量を抑制することができる。Accordingly, suppressing the total consumption of Ca (OH) 2 increases the reaction efficiency of Ca (OH) 2 by spraying the Ca (OH) 2 unreacted exhaust gas again as a reactant recovered can do.
【００１３】[0013]
【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。図１において、反応塔１はごみ等を焼却処理す
る焼却炉の煙道に連通して設けられており、反応塔１に
は反応剤として粉末もしくはスラリー状のＣａ（ＯＨ）
2 （消石灰）を噴霧する反応剤噴霧装置２の反応剤噴霧
ノズル３が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a reaction tower 1 is provided in communication with a flue of an incinerator that incinerates waste and the like, and the reaction tower 1 is a powder or slurry of Ca (OH) as a reactant.
A reactant spray nozzle 3 of a reactant spray device 2 for spraying 2 (slaked lime) is provided.
【００１４】また、反応塔１の下流側に連通して集塵器
４が設けられており、集塵器４の下流側にはファン装置
５を介して煙突６が連通している。さらに、集塵器４の
ダスト排出経路７の先端側には攪拌装置８を有する高温
水槽９が設けられており、高温水槽９には炉の余熱によ
って加熱された熱水もしくは加熱源としての蒸気が供給
管１０を通して供給されている。A dust collector 4 is provided in communication with the downstream side of the reaction tower 1, and a chimney 6 is connected to the downstream side of the dust collector 4 via a fan device 5. Further, a high temperature water tank 9 having a stirrer 8 is provided on the tip end side of the dust discharge path 7 of the dust collector 4, and the high temperature water tank 9 is heated by the residual heat of the furnace or steam as a heating source. Are supplied through the supply pipe 10.
【００１５】そして、高温水槽９の排出管１１に接続し
て固液分離装置１２が設けられており、固液分離装置１
２は遠心脱水機等で構成されている。また、固液分離装
置１２のケーキ排出経路の先端側には反応剤再生装置１
３が設けられており、反応剤再生装置１３はケーキを乾
燥して粉末化するかもしくは水を加えてスラリー化する
もので、その再生剤噴霧ノズル１４が反応塔１の内部に
突設されている。A solid-liquid separation device 12 is connected to the discharge pipe 11 of the high temperature water tank 9, and the solid-liquid separation device 1 is provided.
2 is composed of a centrifugal dehydrator or the like. In addition, at the tip side of the cake discharge path of the solid-liquid separation device 12, the reactant regeneration device 1
3 is provided, and the reactant regenerator 13 is for drying and pulverizing the cake or adding water to make a slurry, and the regenerant spray nozzle 14 is provided inside the reaction tower 1 so as to project. There is.
【００１６】以下、上記構成における作用を説明する。
焼却炉から反応塔１に排ガスを導くとともに、反応剤噴
霧装置２の反応剤噴霧ノズル３から反応剤として粉末も
しくはスラリー状のＣａ（ＯＨ）2 を噴霧する。The operation of the above structure will be described below.
Exhaust gas is introduced from the incinerator to the reaction tower 1, and Ca (OH) 2 in powder or slurry form is sprayed as a reactant from the reactant spray nozzle 3 of the reactant sprayer 2 .
【００１７】反応塔１においては、噴霧されたＣａ（Ｏ
Ｈ）2 が排ガス中のＨＣｌと反応し、生成したＣａＣｌ
2 がＣａ（ＯＨ）2の粒子の表面を被覆する。このと
き、ＣａＣｌ2 の内部移動速度が遅いので未反応のＣａ
（ＯＨ）2 がファン装置５による吸引力を受けて排ガス
とともに集塵器４に流入してしまう。このため、集塵器
４においてＣａＣｌ2 に被覆された未反応のＣａ（Ｏ
Ｈ）2 をダストとして捕捉する。In the reaction tower 1, the sprayed Ca (O
H) 2 reacts with HCl in the exhaust gas to produce CaCl
2 coats the surface of the particles of Ca (OH) 2 . At this time, since the internal migration speed of CaCl 2 is slow, unreacted Ca
(OH) 2 receives the suction force of the fan device 5 and flows into the dust collector 4 together with the exhaust gas. Therefore, in the dust collector 4 unreacted coated on CaCl 2 Ca (O
H) 2 is captured as dust.
【００１８】そして、捕捉したダストをダスト排出経路
７を通して高温水槽９に投入し、攪拌装置８によって攪
拌しながら高温水中にダストを溶解する。このとき、Ｃ
ａ（ＯＨ）2 は高温になるほど水に溶解し難く、ＣａＣ
ｌ2 は高温域において高い溶解性を示すので、未反応の
Ｃａ（ＯＨ）2 の表面を覆ったＣａＣｌ2 が水相に移行
し、固相のＣａ（ＯＨ）2 の表面からＣａＣｌ2 が分離
される。Then, the captured dust is introduced into the high temperature water tank 9 through the dust discharge path 7, and the dust is dissolved in the high temperature water while being stirred by the stirring device 8. At this time, C
a (OH) 2 is less soluble in water at higher temperatures, and CaC
Since l 2 has high solubility in a high temperature range, CaCl 2 covering the surface of unreacted Ca (OH) 2 moves to the water phase, and CaCl 2 is separated from the surface of solid phase Ca (OH) 2. To be done.
【００１９】そして、高温水槽９の混合液を排出管１１
を通して固液分離装置１２に導き、ＣａＣｌ2 が溶解し
た分離液と、固相のＣａ（ＯＨ）2 を含む脱水ケーキと
に分離して未反応のＣａ（ＯＨ）2 を不溶性ダストとと
もに回収する。また、分離液は次系に導いてＣａＣｌ2
を易溶性の重金属塩化物とともに分離し、溶液を重金属
処理した後に濃縮して回収し、再利用を図る。さらに、
脱水ケーキは反応剤再生装置１３に導いて固相のＣａ
（ＯＨ）2 と不溶性ダストの混合物を粉末もしくはスラ
リー化し、再生剤噴霧ノズル１４から再度反応塔１に再
生反応剤として噴霧する。Then, the mixed liquid in the high temperature water tank 9 is discharged into the discharge pipe 11
Led to solid-liquid separator 12 through a separation liquid CaCl 2 is dissolved, the separated into a dehydrated cake containing Ca (OH) 2 in the solid phase unreacted Ca and (OH) 2 recovering with insoluble dust. In addition, the separated liquid is led to the next system and CaCl 2
Is separated with the easily soluble heavy metal chloride, and the solution is treated with heavy metal and then concentrated and recovered for reuse. further,
The dehydrated cake is led to the reactant regenerator 13 and solid phase Ca is introduced.
The mixture of (OH) 2 and insoluble dust is made into powder or slurry and sprayed again from the regenerant spray nozzle 14 into the reaction tower 1 as a regenerated reactant.
【００２０】このとき、反応剤噴霧ノズル３から噴霧す
る反応剤と再生剤噴霧ノズル１４から噴霧する再生反応
剤を、スラリーと再生スラリー、スラリーと再生粉末、
粉末と再生スラリー、粉末と再生粉末などのように、組
み合わせることにより、効率の良い排ガス処理を行え
る。At this time, the reaction agent sprayed from the reaction agent spray nozzle 3 and the regenerated reaction agent sprayed from the regenerant spray nozzle 14 are slurried and regenerated slurry, slurry and regenerated powder,
By combining powder and recycled slurry, powder and recycled powder, and the like, efficient exhaust gas treatment can be performed.
【００２１】したがって、未反応のＣａ（ＯＨ）2 を回
収して再度反応剤として排ガス中に噴霧することによっ
てＣａ（ＯＨ）2 の反応効率を高めてＣａ（ＯＨ）2 の
総消費量を抑制することができる。[0021] Thus, inhibition of total consumption of Ca (OH) 2 increases the reaction efficiency of Ca (OH) 2 by spraying the Ca (OH) 2 unreacted exhaust gas again as a reactant recovered can do.
【００２２】[0022]
【発明の効果】以上述べたように本発明の方法によれ
ば、Ｃａ（ＯＨ）2が高温になるほど水に溶解し難く、
ＣａＣｌ2 が高温域において高い溶解性を示す特性を利
用し、集塵器で捕捉されたダストを高温水中に投入して
ＣａＣｌ2 を水相に移行させることにより、固相のＣａ
（ＯＨ）2 を回収できるので、回収したＣａ（ＯＨ）2
を再度反応剤として排ガス中に噴霧することによってＣ
ａ（ＯＨ）2 の反応効率を高めることができ、結果とし
てＣａ（ＯＨ）2 の総消費量を抑制することができる。As described above, according to the method of the present invention, the higher the temperature of Ca (OH) 2 is, the more difficult it is to dissolve in water.
Utilizing the property that CaCl 2 has high solubility in a high temperature range, the dust captured by the dust collector is put into high temperature water to transfer CaCl 2 to an aqueous phase, thereby solid phase Ca
Since (OH) 2 can be recovered, the recovered Ca (OH) 2
By again spraying C into the exhaust gas as a reactant
The reaction efficiency of a (OH) 2 can be increased, and as a result, the total consumption of Ca (OH) 2 can be suppressed.
【図１】本発明の一実施例における塩化水素除去装置の
全体構成図である。FIG. 1 is an overall configuration diagram of a hydrogen chloride removing device according to an embodiment of the present invention.
１ 反応塔 ２ 反応剤噴霧装置 ４ 集塵器 ９ 高温水槽 １２ 固液分離装置 １３ 反応剤再生装置 1 Reactor Tower 2 Reactant Sprayer 4 Dust Collector 9 High Temperature Water Tank 12 Solid-Liquid Separator 13 Reagent Regenerator
Claims (2)
スラリー状の消石灰を反応剤として噴霧し、反応生成物
および未反応の反応剤を含むダストを集塵器で捕捉し、
捕捉したダストを高温水で溶解し、ダスト中のＣａＣｌ
2 を水相に移行させて固相のＣａ（ＯＨ）2 と分離し、
分離した固相のＣａ（ＯＨ）2 を再度反応剤として排ガ
ス中に噴霧することを特徴とする塩化水素除去方法。1. A slaked lime powder or slurry is sprayed as a reactant into an exhaust gas containing hydrogen chloride, and dust containing a reaction product and an unreacted reactant is captured by a dust collector,
The captured dust is dissolved in high temperature water, and CaCl in the dust is dissolved.
2 is transferred to the aqueous phase and separated from solid phase Ca (OH) 2 ,
A method for removing hydrogen chloride, characterized in that the separated solid phase Ca (OH) 2 is sprayed again into the exhaust gas as a reactant.
粉末もしくはスラリー状の消石灰を噴霧する反応剤噴霧
装置と、反応塔の下流側に連通して設けられた集塵器
と、集塵器から排出されるダストを溶解するための高温
水槽と、高温水槽から取り出した混合液を固液分離する
固液分離装置と、固液分離装置で分離された脱水ケーキ
を粉末化もしくはスラリー化して反応塔に噴霧する反応
剤再生装置とを備えたことを特徴とする塩化水素除去装
置。2. A reaction tower into which exhaust gas flows, a device for spraying a slaked lime powder or slurry into the reaction tower, a dust collector provided in communication with the downstream side of the reaction tower, and a collector. A high-temperature water tank for dissolving the dust discharged from the dust container, a solid-liquid separator for solid-liquid separation of the mixed liquid taken out from the high-temperature water tank, and a dehydrated cake separated by the solid-liquid separator made into powder or slurry. A hydrogen chloride removing device comprising: a reaction agent regenerating device for spraying the reaction mixture onto a reaction tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233511A JPH0568851A (en) | 1991-09-13 | 1991-09-13 | Method and equipment for removing hydrogen chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233511A JPH0568851A (en) | 1991-09-13 | 1991-09-13 | Method and equipment for removing hydrogen chloride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0568851A true JPH0568851A (en) | 1993-03-23 |
Family
ID=16956175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3233511A Pending JPH0568851A (en) | 1991-09-13 | 1991-09-13 | Method and equipment for removing hydrogen chloride |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0568851A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100482818B1 (en) * | 2001-11-15 | 2005-04-14 | 블루버드환경 주식회사 | Gas cleaning system equipped with reactant recycling system to reduce Dioxine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141284A (en) * | 1990-10-03 | 1992-05-14 | Mitsubishi Heavy Ind Ltd | Treatment of ash collected by dust collector |
-
1991
- 1991-09-13 JP JP3233511A patent/JPH0568851A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141284A (en) * | 1990-10-03 | 1992-05-14 | Mitsubishi Heavy Ind Ltd | Treatment of ash collected by dust collector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100482818B1 (en) * | 2001-11-15 | 2005-04-14 | 블루버드환경 주식회사 | Gas cleaning system equipped with reactant recycling system to reduce Dioxine |
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