JP2008296077A - Method and apparatus for treatment of exhaust gas dust - Google Patents

Method and apparatus for treatment of exhaust gas dust Download PDF

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JP2008296077A
JP2008296077A JP2007141651A JP2007141651A JP2008296077A JP 2008296077 A JP2008296077 A JP 2008296077A JP 2007141651 A JP2007141651 A JP 2007141651A JP 2007141651 A JP2007141651 A JP 2007141651A JP 2008296077 A JP2008296077 A JP 2008296077A
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gas
mercury
dust
exhaust gas
ammonia
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Atsushi Yano
淳 矢野
Shuji Hamano
修史 浜野
Yasuhiro Kusano
康弘 草野
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Hitachi Zosen Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for treatment of exhaust gas dust which enable recovery removal of mercury contained in exhaust gas dust, simultaneous recovery of ammonia and reuse of the ammonia in treatment of exhaust gas. <P>SOLUTION: The method of treating exhaust gas dust containing an ammonium salt and mercury has the heating process of heating the dust to decompose the ammonium salt in the dust thermally so as to generate ammonia gas and vaporize mercury, the separating process of separating the dust after the heating process from the heated gas containing ammonia gas and vaporized mercury, the cooling process of cooling the heated gas separated so as to generate condensed water from the gas, the mercury recovery process of separating the condensed water from the gas for storage and forming metal mercury in the stored water so as to recover mercury and the ammonia recovery process recovering ammonia from the gas after removal of mercury. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えばセメント焼成キルン、石炭火力発電所や医療廃棄物焼却装置、下水汚泥の焼却処理装置などの施設から出る排ガス中に含まれるダストの処理方法および装置に関するものである。   The present invention relates to a method and apparatus for treating dust contained in exhaust gas from facilities such as cement burning kilns, coal-fired power plants, medical waste incinerators, and sewage sludge incinerators.

近年、環境中への水銀排出をさらに削減することが求められている。また、石炭灰のセメント原料化などのように事業活動で発生する廃棄物のリサイクルの努力が進められている。   In recent years, there has been a demand for further reducing mercury emissions into the environment. In addition, efforts are being made to recycle waste generated in business activities, such as using coal ash as a raw material for cement.

例えば、セメント焼成キルンにおける排ガスは、原料の予熱装置および集塵機を経て煙突から排出される。予熱装置では、石灰石や粘土などのセメント原料粉末が高温の排ガスと熱交換して予熱、仮焼処理される。集塵機で捕集するダストは焼成キルンに戻されて原料として再使用される。セメント焼成キルンにおいては、近年さまざまな廃棄物を原料として受け入れるようになってきたこともあり、このダストに含まれる水銀が再び焼成キルンに戻され系内を循環蓄積されることが問題となってきている。   For example, exhaust gas in a cement fired kiln is discharged from a chimney through a raw material preheating device and a dust collector. In the preheating device, cement raw material powder such as limestone and clay is preheated and calcined by exchanging heat with high temperature exhaust gas. The dust collected by the dust collector is returned to the firing kiln and reused as a raw material. In cement fired kilns, various wastes have been accepted as raw materials in recent years, and it has become a problem that mercury contained in this dust is returned to the fired kiln and accumulated in the system. ing.

そこで、これら水銀を除去するために、例えば、原料に含まれる水銀及び水銀化合物をガス化して吸着除去する方法などが行われている（特許文献１など）。
特開２００３−１９２４０７号公報 Therefore, in order to remove these mercury, for example, a method of gasifying and removing mercury and a mercury compound contained in the raw material is performed (Patent Document 1, etc.).
JP 2003-192407 A

前記のようなセメント焼成キルンのみならず、石炭火力発電所や医療廃棄物焼却装置などから出る排ガス中は、ＮＯｘなどの有害成分を含むため、そのまま外部に排出することができない。そのため、排ガス処理では、高温部に還元剤として尿素などのアンモニア源を吹き込むことが一般的に行われている（無触媒脱硝）。この場合には排ガス中のアンモニアは温度降下に伴い排ガス中の酸性ガス（ＨＣｌ、ＳＯｘなど）と反応しアンモニウム塩として捕集ダスト中に取り込まれる。   In addition to the cement kiln as described above, exhaust gas from coal-fired power plants, medical waste incinerators, and the like contains harmful components such as NOx and cannot be discharged to the outside as it is. Therefore, in exhaust gas treatment, ammonia sources such as urea are generally blown as a reducing agent into the high temperature part (non-catalytic denitration). In this case, ammonia in the exhaust gas reacts with acidic gas (HCl, SOx, etc.) in the exhaust gas as the temperature drops, and is taken into the collected dust as an ammonium salt.

排ガス中のダストに含まれる水銀を回収除去することは、前記のように一般的に行われているが、排ガス中のアンモニアについては、そのまま外部に排出されるのが実状である。   The recovery and removal of mercury contained in the dust in the exhaust gas is generally performed as described above, but the actual situation is that ammonia in the exhaust gas is discharged to the outside as it is.

そこで、本発明は、排ガス中のダストに含まれる水銀を回収除去することに加え、アンモニアも同時に回収し、これを排ガス処理に再使用し得る、排ガスダストの処理方法及び装置を提供することを課題とする。   Therefore, the present invention provides a method and apparatus for treating exhaust gas dust, which can recover and remove mercury contained in dust in exhaust gas, and simultaneously recover ammonia and reuse it for exhaust gas treatment. Let it be an issue.

請求項１に係る発明は、アンモニウム塩と水銀を含む排ガスダストの処理方法において、
同ダストを加熱し、ダスト中のアンモニウム塩を熱分解してアンモニアガスを生じさせると共に水銀を揮散させる加熱工程と、
加熱工程から来るダストを、アンモニアガスと揮散水銀を含む加熱ガスから分離する分離工程と、
分離された加熱ガスを冷却し、同ガスから凝縮水を生じさせる冷却工程と、
上記凝縮水をガスから分離して蓄え、貯水中に金属水銀を生成させて回収する水銀回収工程と、
水銀除去後のガスからアンモニアを回収するアンモニア回収工程とを
含む、排ガスダストの処理方法である。 The invention according to claim 1 is a method for treating exhaust gas dust containing an ammonium salt and mercury.
Heating the dust, pyrolyzing ammonium salt in the dust to produce ammonia gas and volatilize mercury,
A separation step of separating dust coming from the heating step from a heating gas containing ammonia gas and volatilized mercury;
A cooling process for cooling the separated heated gas and generating condensed water from the gas;
A mercury recovery process in which the condensed water is separated from the gas and stored, and metal mercury is generated and recovered in the stored water;
An exhaust gas dust treatment method including an ammonia recovery step of recovering ammonia from a gas after mercury removal.

請求項２に係る発明は、回収したアンモニアを排ガス処理用として再使用する、請求項ｌ記載の排ガスダストの処理方法である。   The invention according to claim 2 is the exhaust gas dust treatment method according to claim 1, wherein the recovered ammonia is reused for exhaust gas treatment.

請求項３に係る発明は、分離工程で加熱ガスから分離されたダストを冷却し処理灰を生じさせる、請求項１または２に記載の排ガスダストの処理方法である。   The invention according to claim 3 is the exhaust gas dust treatment method according to claim 1 or 2, wherein the dust separated from the heated gas in the separation step is cooled to produce treated ash.

請求項４に係る発明は、冷却工程において、加熱ガスをスプレー塔で直接冷却し、および／または、少なくとも一基のコンデンサで間接的に冷却する、請求項１〜３のいずれかに記載の排ガスダストの処理方法である。   The invention according to claim 4 is the exhaust gas according to any one of claims 1 to 3, wherein in the cooling step, the heated gas is directly cooled by a spray tower and / or indirectly cooled by at least one condenser. It is a processing method of dust.

請求項５に係る発明は、冷却工程において、加熱ガスを温度５〜１０℃に冷却する、請求項１〜４のいずれかに記載の排ガスダストの処理方法である。   The invention which concerns on Claim 5 is a processing method of the waste gas dust in any one of Claims 1-4 which cools heating gas to the temperature of 5-10 degreeC in a cooling process.

請求項６に係る発明は、水銀回収工程において、ｐＨ８〜１２に調整した上記凝縮水を水銀回収タンクに蓄える、請求項１〜５のいずれかに記載の排ガスダストの処理方法である。   The invention according to claim 6 is the exhaust gas dust processing method according to any one of claims 1 to 5, wherein in the mercury recovery step, the condensed water adjusted to pH 8 to 12 is stored in a mercury recovery tank.

請求項７に係る発明は、アンモニウム塩と水銀を含む排ガスダストの処理装置において、
同ダストを加熱し、ダスト中のアンモニウム塩を熱分解してアンモニアガスを生じさせると共に水銀を揮散させる加熱手段と、
加熱手段から来るダストを、アンモニアガスと揮散水銀を含む加熱ガスから分離する分離手段と、
分離された加熱ガスを冷却し、同ガスから凝縮水を生じさせる冷却手段と、
上記凝縮水をガスから分離して蓄え、貯水中に金属水銀を生成させて回収する水銀回収タンクと、
水銀除去後のガスからアンモニアを回収するアンモニア回収手段とを
具備する、排ガスダストの処理装置である。 The invention according to claim 7 is an apparatus for treating exhaust gas dust containing an ammonium salt and mercury.
Heating means for heating the dust, pyrolyzing the ammonium salt in the dust to produce ammonia gas and volatilizing mercury;
Separation means for separating dust coming from the heating means from the heating gas containing ammonia gas and volatilized mercury;
Cooling means for cooling the separated heated gas and generating condensed water from the gas;
A mercury recovery tank that separates and stores the condensed water from the gas, and generates and recovers metallic mercury in the stored water;
An exhaust gas dust treatment apparatus comprising ammonia recovery means for recovering ammonia from gas after mercury removal.

請求項８に係る発明は、冷却手段がスブレー塔とその後段に設けられた少なくとも一基のコンデンサとからなる請求項７に記載の排ガスダストの処理装置である。   The invention according to claim 8 is the exhaust gas dust treatment apparatus according to claim 7, wherein the cooling means comprises a subley tower and at least one condenser provided in the subsequent stage.

請求項９に係る発明は、冷却手段が加熱ガスを温度５〜１０℃に冷却する請求項７または８に記載の排ガスダストの処理装置である。   The invention according to claim 9 is the exhaust gas dust treatment apparatus according to claim 7 or 8, wherein the cooling means cools the heated gas to a temperature of 5 to 10 ° C.

請求項１０に係る発明は、水銀回収タンクが、ｐＨ８〜１２に調整した上記凝縮水を蓄える、請求項７〜９のいずれかに記載の排ガスダストの処理装置である。   The invention according to claim 10 is the exhaust gas dust treatment apparatus according to any one of claims 7 to 9, wherein the mercury recovery tank stores the condensed water adjusted to pH 8-12.

本発明によれば、アンモニウム塩と水銀を含む排ガスダストを加熱し、ダスト中のアンモニウム塩を熱分解してアンモニアガスを生じさせると共に水銀を揮散させる、次いで
ダストを、アンモニアガスと揮散水銀を含む加熱ガスから分離し、分離加熱ガスを冷却して同ガスから凝縮水を生じさせ、同水をガスから分離して蓄えて貯水中に金属水銀を生成させて回収し、水銀除去後のガスからアンモニアを回収することで、ダスト中の水銀成分のほぼ全量を金属状態で回収することができると共に、加熱ガスからアンモニアを回収して排ガス処理における脱硝用として再使用することができる。 According to the present invention, the exhaust gas dust containing ammonium salt and mercury is heated, the ammonium salt in the dust is pyrolyzed to generate ammonia gas and volatilize mercury, and then the dust contains ammonia gas and volatilized mercury. Separate from the heated gas, cool the separated heated gas to produce condensed water, separate and store the water from the gas, collect and recover metallic mercury in the stored water, and remove the mercury from the removed gas By recovering ammonia, almost all of the mercury component in the dust can be recovered in a metallic state, and ammonia can be recovered from the heated gas and reused for denitration in exhaust gas treatment.

加えて、ダストから生じる処理灰はセメント原料等に再使用することができる。   In addition, the treated ash generated from the dust can be reused as a cement raw material or the like.

つぎに、本発明を具体的に説明するために、本発明の実施例を示す。   Next, in order to describe the present invention specifically, examples of the present invention will be shown.

実施例１
本発明による処理プロセスは、ダストの加熱器→ダストフィルタ→スプレー塔→コンデンサ→循環ファンからなる循環ガス処理装置を主体として構成される（図１参照）。加熱器では供給されるダストを３５０〜４００℃に加熱することによりダスト中に含まれる水分、水銀、ＶＯＣ、および、アンモニウム塩の熱分解により生じたアンモニアガス（例えばＮＨ４Ｃｌ→ＮＨ３＋ＨＣｌ）などを循環ガス中に放出させる。 Example 1
The treatment process according to the present invention is mainly composed of a circulation gas treatment device comprising a dust heater → dust filter → spray tower → condenser → circulation fan (see FIG. 1). In the heater, the supplied dust is heated to 350-400 ° C., and ammonia gas generated by thermal decomposition of moisture, mercury, VOC, and ammonium salt contained in the dust (for example, NH 4 Cl → NH 3 + HCl). Etc. are released into the circulating gas.

図２は、実際のダストを用いた水銀の揮散性を調べた結果を示す。同図から分かるように、処理温度が３５０℃以上であれば、ダスト中に存在する水銀のほぼ全量を揮散させることができる。   FIG. 2 shows the results of examining the volatility of mercury using actual dust. As can be seen from the figure, if the treatment temperature is 350 ° C. or higher, almost all of the mercury present in the dust can be volatilized.

ダストフィルタでは圧縮空気によってエレメントの逆洗を行うが、この空気は循環ファンにより加熱器→ダストフィルタ→スプレー塔→コンデンサを循環して、前述の水銀、ＶＯＣ、アンモニアのキャリアとして作用する。   In the dust filter, the element is back-washed with compressed air. This air is circulated through a heater, a dust filter, a spray tower, and a condenser by a circulation fan, and acts as a carrier for the mercury, VOC, and ammonia.

高度な水銀回収効率を得るためにはコンデンサは図１に記すように２段階で設置するのが望ましい。すなわち、まず循環ガスをコンデンサ前段で冷却水により温度３０〜４０℃にまで間接冷却したのち、さらにコンデンサ後段でチラー水により温度５〜１０℃まで間接冷却する。   In order to obtain high mercury recovery efficiency, it is desirable to install the capacitor in two stages as shown in FIG. That is, first, the circulating gas is indirectly cooled to a temperature of 30 to 40 ° C. with cooling water at the front stage of the condenser, and further indirectly cooled to a temperature of 5 to 10 ° C. with chiller water at the rear stage of the condenser.

図３は水銀における蒸気圧と温度との関係を示すグラフである。この図において、１ｏｇＰが−１より大きければ、水銀の揮散がし易いことが知られている（例えば；日立造船技報、第３７巻、第３号）。これは、１ｏｇＰが−１より小さければ水銀は液体状態で安定であることを示している。よって、前記循環ガスの冷却温度は、１ｏｇＰが−１より小さくなるように、低くすることが好ましいが、冷却による水銀回収率と、冷却手段などを冷却に要するコストを考慮すると、前記冷却温度の範囲とすることが好ましい。   FIG. 3 is a graph showing the relationship between vapor pressure and temperature in mercury. In this figure, it is known that if 1 ogP is larger than −1, mercury is easily volatilized (for example; Hitachi Zosen Technical Report, Vol. 37, No. 3). This indicates that if 1 ogP is less than -1, mercury is stable in the liquid state. Therefore, it is preferable to lower the cooling temperature of the circulating gas so that 1 ogP becomes smaller than −1. However, in consideration of the mercury recovery rate by cooling and the cost required for cooling the cooling means, the cooling temperature is reduced. It is preferable to be in the range.

コンデンサで疑縮した水分および水銀やＶＯＣはドレンタンクに送られる。ドレンタンクでは水銀が金属状態で沈降分離する。スプレー塔ではドレンタンクの上澄水（以下ドレン水と称する）が循環しており、このドレン水が循環ガスと液ガス接蝕して循環ガス中に含まれる水溶性のＨｇＣｌ２をドレン水中に吸収除去する。ＨｇＣｌ２はドレンタンク内に滞留する間に還元され、やがて金属状態で沈降分離する。 Moisture, mercury, and VOC that have been suspected by the condenser are sent to the drain tank. In the drain tank, mercury settles and separates in a metallic state. In the spray tower, the supernatant water of the drain tank (hereinafter referred to as drain water) circulates, and this drain water is in contact with the circulating gas and absorbs the water-soluble HgCl 2 contained in the circulating gas. Remove. HgCl 2 is reduced while it stays in the drain tank, and eventually settles and separates in a metallic state.

ドレン水はｐＨ＝８〜１２、好ましくはｐＨ＝９〜１１で維持されており、加熱器で加熱分解して生じたアンモニアガスは、これを含む循環ガスとドレン水の液ガス接蝕ではアルカリ性のドレン水中には吸収されない。   The drain water is maintained at pH = 8-12, preferably pH = 9-11, and ammonia gas generated by thermal decomposition with a heater is alkaline in liquid gas corrosion of circulating gas containing this and drain water. It is not absorbed into the drain water.

図１に示すように、ダストフィルタで逆洗用として供給される圧縮空気と、ダストが持ち込む水分により余剰となる循環ガスを、圧力調整弁を介してセメント製造設備のセメントキルンへ戻し、このガス中のアンモニアを同クルンから出る排ガスの無触媒脱硝処理に再使用する。   As shown in FIG. 1, the compressed air supplied for backwashing by the dust filter and the circulating gas surplus due to the moisture brought in by the dust are returned to the cement kiln of the cement production facility via the pressure regulating valve. The ammonia in the tank is reused for non-catalytic denitration treatment of the exhaust gas from the Krung.

スプレー塔を通過した循環ガスは水分飽和状態になっているので、以降減温に伴い水分凝縮を生じる。従ってコンデンサで塩類析出による閉塞といった問題を生じることが全くない。ここで、ドレン水のｐＨはアルカリ性であることが必須であるが、１０程度であれば水銀の還元およびアンモニアガスの吸収のいずれの観点からも充分な効果が得られる。もちろんｐＨが高くても同様の効果は得られるが、極度にｐHを高くすることは、アルカリ薬剤を無駄に消費するのみで不経済であると共に、装置の腐食などの問題が発生するため、これらを考慮すると、前記ｐH範囲にすることが好ましい。   Since the circulating gas that has passed through the spray tower is saturated with water, moisture condenses as the temperature decreases thereafter. Therefore, there is no problem of clogging due to salt precipitation in the capacitor. Here, it is essential that the pH of the drain water is alkaline, but if it is about 10, sufficient effects can be obtained from both viewpoints of mercury reduction and ammonia gas absorption. Of course, the same effect can be obtained even when the pH is high. However, extremely high pH is uneconomical because it consumes alkali chemicals wastefully and causes problems such as corrosion of the equipment. In view of the above, it is preferable to set the pH range.

他方、加熱器を通過した加熱ダストは以降のハンドリングに支障のないように冷却器で冷却され、生じた処理灰はセメント製造装置へ送られ、セメント原料等に再使用することができる。   On the other hand, the heated dust that has passed through the heater is cooled by a cooler so that subsequent handling is not hindered, and the resulting treated ash is sent to a cement manufacturing apparatus and can be reused as a cement raw material or the like.

本発明による排ガスダストの処理方法および装置の例を示すフローシートである。It is a flow sheet which shows the example of the processing method and apparatus of exhaust gas dust by the present invention. 温度と水銀の揮散率の関係を示すグラフである。It is a graph which shows the relationship between temperature and the volatilization rate of mercury. 水銀における蒸気圧と温度の関係を示すグラフである。It is a graph which shows the relationship between the vapor pressure and temperature in mercury.

Claims (10)

アンモニウム塩と水銀を含む排ガスダストの処理方法において、
同ダストを加熱し、ダスト中のアンモニウム塩を熱分解してアンモニアガスを生じさせると共に水銀を揮散させる加熱工程と、
加熱工程から来るダストを、アンモニアガスと揮散水銀を含む加熱ガスから分離する分離工程と、
分離された加熱ガスを冷却し、同ガスから凝縮水を生じさせる冷却工程と、
上記凝縮水をガスから分離して蓄え、貯水中に金属水銀を生成させて回収する水銀回収工程と、
水銀除去後のガスからアンモニアを回収するアンモニア回収工程とを
含む、排ガスダストの処理方法。 In a method for treating exhaust gas dust containing ammonium salt and mercury,
Heating the dust, pyrolyzing ammonium salt in the dust to produce ammonia gas and volatilize mercury,
A separation step of separating dust coming from the heating step from a heating gas containing ammonia gas and volatilized mercury;
A cooling process for cooling the separated heated gas and generating condensed water from the gas;
A mercury recovery process in which the condensed water is separated from the gas and stored, and metal mercury is generated and recovered in the stored water;
A method for treating exhaust gas dust, comprising an ammonia recovery step of recovering ammonia from the gas after mercury removal. 回収したアンモニアを排ガス処理用として再使用する、請求項ｌ記載の排ガスダストの処理方法。   The method for treating exhaust gas dust according to claim 1, wherein the recovered ammonia is reused for exhaust gas treatment. 分離工程で加熱ガスから分離されたダストを冷却し処理灰を生じさせる、請求項１または２に記載の排ガスダストの処理方法。   The exhaust gas dust treatment method according to claim 1 or 2, wherein the dust separated from the heated gas in the separation step is cooled to produce treated ash. 冷却工程において、加熱ガスをスプレー塔で直接冷却し、および／または、少なくとも一基のコンデンサで間接的に冷却する、請求項１〜３のいずれかに記載の排ガスダストの処理方法。   The method for treating exhaust gas dust according to any one of claims 1 to 3, wherein in the cooling step, the heated gas is directly cooled by a spray tower and / or indirectly cooled by at least one condenser. 冷却工程において、加熱ガスを温度５〜１０℃に冷却する、請求項１〜４のいずれかに記載の排ガスダストの処理方法。   The exhaust gas dust treatment method according to any one of claims 1 to 4, wherein the heating gas is cooled to a temperature of 5 to 10 ° C in the cooling step. 水銀回収工程において、ｐＨ８〜１２に調整した上記凝縮水を水銀回収タンクに蓄える、請求項１〜５のいずれかに記載の排ガスダストの処理方法。   The exhaust gas dust treatment method according to any one of claims 1 to 5, wherein in the mercury recovery step, the condensed water adjusted to pH 8 to 12 is stored in a mercury recovery tank. アンモニウム塩と水銀を含む排ガスダストの処理装置において、
同ダストを加熱し、ダスト中のアンモニウム塩を熱分解してアンモニアガスを生じさせると共に水銀を揮散させる加熱手段と、
加熱手段から来るダストを、アンモニアガスと揮散水銀を含む加熱ガスから分離する分離手段と、
分離された加熱ガスを冷却し、同ガスから凝縮水を生じさせる冷却手段と、
上記凝縮水をガスから分離して蓄え、貯水中に金属水銀を生成させて回収する水銀回収タンクと、
水銀除去後のガスからアンモニアを回収するアンモニア回収手段とを
具備する、排ガスダストの処理装置。 In exhaust gas dust processing equipment containing ammonium salt and mercury,
Heating means for heating the dust, pyrolyzing the ammonium salt in the dust to produce ammonia gas and volatilizing mercury;
Separation means for separating dust coming from the heating means from the heating gas containing ammonia gas and volatilized mercury;
Cooling means for cooling the separated heated gas and generating condensed water from the gas;
A mercury recovery tank that separates and stores the condensed water from the gas, and generates and recovers metallic mercury in the stored water;
An exhaust gas dust treatment apparatus comprising ammonia recovery means for recovering ammonia from a gas after mercury removal. 冷却手段がスブレー塔とその後段に設けられた少なくとも一基のコンデンサとからなる請求項７に記載の排ガスダストの処理装置。   8. The exhaust gas dust treatment apparatus according to claim 7, wherein the cooling means comprises a subley tower and at least one condenser provided in the subsequent stage. 冷却手段が加熱ガスを温度５〜１０℃に冷却する請求項７または８に記載の排ガスダストの処理装置。   The exhaust gas dust treatment apparatus according to claim 7 or 8, wherein the cooling means cools the heated gas to a temperature of 5 to 10 ° C. 水銀回収タンクが、ｐＨ８〜１２に調整した上記凝縮水を蓄える、請求項７〜９のいずれかに記載の排ガスダストの処理装置。   The apparatus for treating exhaust gas dust according to any one of claims 7 to 9, wherein the mercury recovery tank stores the condensed water adjusted to pH 8-12.
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