JP2014171986A - Method for recovering mercury in exhaust gas - Google Patents

Method for recovering mercury in exhaust gas Download PDF

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JP2014171986A
JP2014171986A JP2013047683A JP2013047683A JP2014171986A JP 2014171986 A JP2014171986 A JP 2014171986A JP 2013047683 A JP2013047683 A JP 2013047683A JP 2013047683 A JP2013047683 A JP 2013047683A JP 2014171986 A JP2014171986 A JP 2014171986A
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exhaust gas
mercury
dust
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JP6066191B2 (en
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Shuichi Nakano
修一 中野
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Taiheiyo Cement 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
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Abstract

PROBLEM TO BE SOLVED: To efficiently recover mercury in a flue gas by utilizing a dry desulfurization/denitration device using an active coke.SOLUTION: There is provided a mercury recovering method which comprises recovering dust included in a flue gas G7 discharged from an active coke regeneration tower 11 attached to a dry desulfurization/denitration device 8, 9 for a flue gas using an active coke AC, and recovering mercury included in the recovered dust. Mercury (metal mercury) is recovered from the dust which is contained in the gas discharged from the active coke regeneration tower and has conventionally been scrapped or reused as a part of a raw material or fuel. The dust is recovered by spraying a water CW in the flue gas G7. The dust is recovered together with an adsorbate which has adsorbed an ionic mercury included in a waste liquid W1 obtained by spraying the water CW sprayed to the dust. The dry desulfurization/denitration device can treat the exhaust gas from a power generation boiler, a blast furnace or a cement kiln for burning an eco-cement.

Description

本発明は、排ガス中の水銀回収方法に関し、特に、活性コークスを用いた乾式脱硫脱硝装置を利用して燃焼排ガス中の水銀を回収する方法に関する。   The present invention relates to a method for recovering mercury in exhaust gas, and more particularly, to a method for recovering mercury in combustion exhaust gas using a dry desulfurization denitration apparatus using activated coke.

発電用ボイラ、高炉又は焼成炉等からの排ガス等を処理する装置として、吸着塔内に導入された活性コークスに排ガスを接触させ、ＳＯｘ（硫黄酸化物）やＮＯｘ（窒素酸化物）等といったガス中の有害物質を活性コークスに吸着させて除去する乾式脱硫脱硝装置が知られている。この装置では、排ガス中のＳＯｘは、硫酸として活性コークス（炭素質触媒）に吸着されて除去される。また、前処理として排ガス中にアンモニアを注入した場合には、ＳＯｘはアンモニウム塩として吸着されるとともに、ＮＯｘは窒素に還元されて無害化される。さらに、排ガス中に水銀のような重金属を含有する場合にも、活性コークスに吸着される（例えば、特許文献１参照）。   As a device for treating exhaust gas from power generation boilers, blast furnaces, firing furnaces, etc., gas such as SOx (sulfur oxide) or NOx (nitrogen oxide) is brought into contact with activated coke introduced into the adsorption tower. There is known a dry desulfurization denitration apparatus that adsorbs and removes harmful substances in activated coke. In this apparatus, SOx in the exhaust gas is adsorbed and removed by activated coke (carbonaceous catalyst) as sulfuric acid. Further, when ammonia is injected into the exhaust gas as pretreatment, SOx is adsorbed as an ammonium salt and NOx is reduced to nitrogen and rendered harmless. Further, when the exhaust gas contains a heavy metal such as mercury, it is adsorbed by the activated coke (see, for example, Patent Document 1).

特開２００６−０７５６７０号公報JP 2006-0775670 A

上述のように、乾式脱硫脱硝装置において排ガス中の水銀を活性コークスに吸着させて回収することができるが、水銀が環境に与える影響を極力小さくするため、また、水銀をより低コストで回収するため、さらに効率よく水銀を回収する方法の開発が求められていた。   As described above, mercury in exhaust gas can be adsorbed and collected by activated coke in a dry desulfurization denitration system, but mercury is collected at a lower cost in order to minimize the impact of mercury on the environment. Therefore, development of a method for recovering mercury more efficiently has been demanded.

そこで、本発明は、活性コークスを用いた乾式脱硫脱硝装置を利用して燃焼排ガス中の水銀を回収するにあたって、さらに効率よく水銀を回収する方法を提供することを目的とする。   Accordingly, an object of the present invention is to provide a method for recovering mercury more efficiently when recovering mercury in combustion exhaust gas using a dry desulfurization denitration apparatus using activated coke.

上記目的を達成するため、本発明は、排ガス中の水銀回収方法であって、活性コークスを用いた燃焼排ガスの乾式脱硫脱硝装置に付設されている活性コークス再生塔から排出されたガスに含まれるダストを回収し、該回収したダストに含まれる水銀を回収することを特徴とする。   In order to achieve the above object, the present invention is a method for recovering mercury in exhaust gas, which is included in the gas discharged from the activated coke regeneration tower attached to the dry desulfurization denitration apparatus for combustion exhaust gas using activated coke. Dust is collected, and mercury contained in the collected dust is collected.

そして、本発明によれば、従来廃棄するか、原料や燃料の一部として再利用されていた、活性コークス再生塔から排出されたガスに含まれるダストを回収し、該ダストから水銀（金属水銀）を回収するため、従来より水銀を効率よく低コストで回収することができる。   According to the present invention, the dust contained in the gas discharged from the activated coke regeneration tower, which has been conventionally discarded or reused as part of the raw material or fuel, is recovered, and mercury (metal mercury) is recovered from the dust. ) Can be recovered more efficiently and at a lower cost.

前記排ガスに水を噴霧することにより、前記ダストを回収することができ、簡単な装置で容易に水銀を含むダストを回収することができる。   By spraying water on the exhaust gas, the dust can be recovered, and the dust containing mercury can be easily recovered with a simple apparatus.

前記ダストを、前記排ガスに噴霧した水を噴霧して得られた廃液に含まれるイオン性水銀を吸着した吸着物と共に回収することができる。   The dust can be collected together with an adsorbate adsorbing ionic mercury contained in a waste liquid obtained by spraying water sprayed on the exhaust gas.

前記乾式脱硫脱硝装置は、発電用ボイラ、高炉又はエコセメントを焼成するセメントキルンの排ガスを処理することができ、これらの装置から低コストで水銀を回収することができる。   The dry desulfurization denitration apparatus can treat the exhaust gas of a power kiln, blast furnace, or cement kiln that fires eco-cement, and can recover mercury from these apparatuses at low cost.

以上のように、本発明によれば、活性コークスを用いた乾式脱硫脱硝装置を利用して燃焼排ガス中の水銀を回収するにあたって、さらに効率よく水銀を回収する方法を提供することができる。   As described above, according to the present invention, it is possible to provide a method for recovering mercury more efficiently when recovering mercury in combustion exhaust gas using a dry desulfurization denitration apparatus using activated coke.

本発明に係る排ガス中の水銀回収方法を適用したエコセメントキルン排ガスの処理装置を示す全体構成図である。It is a whole block diagram which shows the processing apparatus of the eco-cement kiln exhaust gas to which the mercury recovery method in the exhaust gas which concerns on this invention is applied. 図１のエコセメントキルン排ガスの処理装置の排ガス洗浄工程を示す全体構成図である。It is a whole block diagram which shows the waste gas washing process of the processing apparatus of the eco-cement kiln waste gas of FIG. 図１のエコセメントキルン排ガスの処理装置の水銀回収工程を示す全体構成図である。It is a whole block diagram which shows the mercury recovery process of the processing apparatus of the eco-cement kiln exhaust gas of FIG.

次に、本発明を実施するための形態について図面を参照しながら詳細に説明する。尚、以下の説明においては、本発明に係る方法を、エコセメントを焼成するセメントキルンに付設された乾式脱硫脱硝装置に適用した場合を例にとって説明する。   Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following description, the case where the method according to the present invention is applied to a dry desulfurization denitration apparatus attached to a cement kiln for firing ecocement will be described as an example.

図１は、エコセメントキルン排ガスの処理装置を示し、この排ガス処理装置１は、ロータリキルン２からのキルン排ガスを冷却する冷却塔３と、冷却塔３からの排ガスＧ１を固気分離するサイクロン４と、サイクロン４からの排ガスＧ２に含まれる微粉を回収する第１バグフィルタ５と、第１バグフィルタ５からの排ガスＧ３に消石灰粉等の酸性ガス処理剤ＧＴを添加した後にダストを回収する第２バグフィルタ６と、第２バグフィルタ６の排ガスＧ４を脱硫・脱硝する脱硫塔８及び脱硝塔９と、脱硫塔８から排出された活性コークスＡＣを加熱再生する再生塔１１と、再生塔１１の排ガスＧ７を洗浄する排ガス洗浄工程１２と、洗浄後の排ガスから水銀を回収する水銀回収工程１３と、高濃度の塩化物を含有するダストＤ１〜Ｄ３をゼロエミッション思想に基づいて処理するＨＭＸ処理工程１４と、最終排水処理工程１５とで構成される。   FIG. 1 shows an eco-cement kiln exhaust gas treatment apparatus. This exhaust gas treatment apparatus 1 includes a cooling tower 3 for cooling the kiln exhaust gas from the rotary kiln 2 and a cyclone 4 for solid-gas separation of the exhaust gas G1 from the cooling tower 3. A first bag filter 5 that collects the fine powder contained in the exhaust gas G2 from the cyclone 4, and an acid gas treatment agent GT such as slaked lime powder that is added to the exhaust gas G3 from the first bag filter 5 to collect dust. A two-bag filter 6, a desulfurization tower 8 and a denitration tower 9 for desulfurizing and denitrating the exhaust gas G4 of the second bag filter 6, a regeneration tower 11 for heating and regenerating the activated coke AC discharged from the desulfurization tower 8, and a regeneration tower 11 Exhaust gas cleaning process 12 for cleaning the exhaust gas G7, mercury recovery process 13 for recovering mercury from the exhaust gas after cleaning, and dusts D1 to D3 containing high-concentration chlorides to zero And HMX process 14 for processing on the basis of the cushion concept, and a final waste water treatment process 15.

サイクロン４は、排ガスＧ１に含まれる粗粉ダストを回収するために備えられ、回収されたダストＤ１は、ＨＭＸ処理工程１４に送られる。   The cyclone 4 is provided for recovering the coarse dust contained in the exhaust gas G1, and the recovered dust D1 is sent to the HMX processing step 14.

第１バグフィルタ５は、サイクロン４からの排ガスＧ２に含まれる微粉ダストを回収するために備えられ、回収されたダストＤ２は、ＨＭＸ処理工程１４に送られる。   The first bag filter 5 is provided to collect fine dust contained in the exhaust gas G2 from the cyclone 4, and the collected dust D2 is sent to the HMX processing step 14.

第２バグフィルタ６は、排ガスＧ３に脱硫剤としての消石灰粉等の酸性ガス処理剤ＧＴを添加した後、この排ガスＧ３に含まれるダストＤ３を回収するために備えられ、回収されたダストＤ３は、ＨＭＸ処理工程１４に送られる。   The second bag filter 6 is provided to collect the dust D3 contained in the exhaust gas G3 after adding an acid gas treatment agent GT such as slaked lime powder as a desulfurizing agent to the exhaust gas G3. , And sent to the HMX processing step 14.

脱硫塔８は、活性コークスＡＣに排ガスＧ４を接触させ、排ガスＧ４に含まれるＳＯｘを活性コークスＡＣに吸着させて除去するために設けられる。排ガス中のＳＯｘは、硫酸として活性コークスＡＣに吸着されて除去される。   The desulfurization tower 8 is provided to bring the exhaust gas G4 into contact with the activated coke AC and to remove SOx contained in the exhaust gas G4 by adsorbing the activated coke AC. SOx in the exhaust gas is adsorbed and removed by activated coke AC as sulfuric acid.

脱硝塔９は、脱硫塔８からの排ガスＧ５にアンモニアガス（ＮＨ3）を注入した後、活性コークスＡＣに排ガスＧ５を接触させ、ＮＨ3によってＮＯｘを窒素に還元して無害化すると共に、排ガスＧ５に残留するＮＯｘを活性コークスＡＣに吸着させて除去するために設けられる。 The denitration tower 9 injects ammonia gas (NH 3 ) into the exhaust gas G5 from the desulfurization tower 8 and then contacts the exhaust gas G5 with the activated coke AC to reduce NOx to nitrogen by NH 3 to render it harmless. The NOx remaining in G5 is provided for adsorbing and removing the activated coke AC.

再生塔１１は、活性度が低下した活性コークスＡＣを再生するために備えられ、硫酸、アンモニウム塩等の吸着物質を熱風によって加熱して脱離させて活性度を元に戻す。加熱再生の際には、活性コークスＡＣからの脱離物をパージするため窒素ガスが供給される。   The regeneration tower 11 is provided to regenerate the activated coke AC having a lowered activity, and the adsorbed material such as sulfuric acid and ammonium salt is heated and desorbed by hot air to restore the activity. During heat regeneration, nitrogen gas is supplied to purge the desorbed material from the activated coke AC.

排ガス洗浄工程１２は、再生塔１１からの排ガスＧ７を洗浄するために備えられ、図２に示すように、排ガスＧ７を循環水ＣＷを用いて冷却するガス冷却塔２１と、ガス冷却塔２１の排ガスＧ８を循環水ＣＷで洗浄する第１洗浄塔２２と、第１洗浄塔２２の排ガスＧ９をさらに循環水ＣＷで洗浄する第２洗浄塔２３等で構成される。   The exhaust gas cleaning step 12 is provided for cleaning the exhaust gas G7 from the regeneration tower 11, and as shown in FIG. 2, the gas cooling tower 21 for cooling the exhaust gas G7 using the circulating water CW, and the gas cooling tower 21 The first cleaning tower 22 for cleaning the exhaust gas G8 with the circulating water CW, the second cleaning tower 23 for further cleaning the exhaust gas G9 of the first cleaning tower 22 with the circulating water CW, and the like.

ガス冷却塔２１は、再生塔１１での加熱により温度上昇した排ガスＧ６に循環水ＣＷを噴霧して冷却するために備えられる。   The gas cooling tower 21 is provided for spraying and cooling the circulating water CW on the exhaust gas G6 whose temperature has been increased by heating in the regeneration tower 11.

第１洗浄塔２２は、ガス冷却塔２１の排ガスＧ７に循環水ＣＷを噴霧して排ガスＧ７に含まれる活性コークスＡＣのダストを回収するために備えられ、固液分離能力に優れたミュースクラバー等が設置される。   The first cleaning tower 22 is provided to collect the dust of the activated coke AC contained in the exhaust gas G7 by spraying the circulating water CW on the exhaust gas G7 of the gas cooling tower 21, and is a mus scrubber having excellent solid-liquid separation capability. Is installed.

第２洗浄塔２３は、第１洗浄塔２２の排ガスＧ９に循環水ＣＷ及び水酸化ナトリウム溶液を噴霧して排ガスＧ９に含まれる硫酸又は亜硫酸を中和するために備えられる。   The second cleaning tower 23 is provided to neutralize sulfuric acid or sulfurous acid contained in the exhaust gas G9 by spraying the circulating water CW and the sodium hydroxide solution on the exhaust gas G9 of the first cleaning tower 22.

図３に示すように、水銀回収工程１３は、排ガス洗浄工程１２からの廃液Ｗ１に含まれる水銀を回収するために備えられ、廃液Ｗ１のｐＨを調整するｐＨ調整槽３１と、ｐＨ調整後の廃液Ｗ３中の水銀を含む重金属を沈降させる沈降槽３２と、沈降槽３２からの廃液Ｗ３に水銀キレート剤ＣＨを添加して撹拌する反応槽３３と、沈降槽３２の沈降物及び反応槽３３での反応生成物からなるスラリーＳ１を貯留する汚泥槽３４と、汚泥槽３４からのスラリーＳ２を固液分離する繊維ろ過器３５と、繊維ろ過器３５で分離されたろ液を貯留する処理水槽３６と、繊維ろ過器３５で分離された濃縮汚泥（水銀汚泥）を貯留する濃縮槽３７等で構成される。   As shown in FIG. 3, the mercury recovery process 13 is provided for recovering mercury contained in the waste liquid W1 from the exhaust gas cleaning process 12, and a pH adjustment tank 31 for adjusting the pH of the waste liquid W1; In the sedimentation tank 32 for sedimenting heavy metals including mercury in the waste liquid W3, the reaction tank 33 for adding the mercury chelating agent CH to the waste liquid W3 from the sedimentation tank 32 and stirring, the sediment in the sedimentation tank 32 and the reaction tank 33 A sludge tank 34 for storing the slurry S1 made of the reaction product, a fiber filter 35 for solid-liquid separation of the slurry S2 from the sludge tank 34, a treated water tank 36 for storing the filtrate separated by the fiber filter 35, and , And a concentration tank 37 for storing the concentrated sludge (mercury sludge) separated by the fiber filter 35.

図１に戻り、ＨＭＸ処理工程１４は、高濃度の塩化物を含有するダストＤ１〜Ｄ３から、塩化物及びアルカリを除去し、鉛や亜鉛等を非鉄金属精錬原料として回収すると共に、カルシウムを主成分とした回収後の残渣も同時にセメント原料として再利用することができるように処理してゼロエミッションを図る工程である。   Returning to FIG. 1, the HMX treatment step 14 removes chloride and alkali from dusts D1 to D3 containing a high concentration of chloride, collects lead, zinc, and the like as non-ferrous metal refining raw materials, and mainly contains calcium. This is a process for achieving zero emissions by treating the recovered residue as a component so that it can be reused as a cement raw material at the same time.

次に、上記構成を有する排ガス処理装置１の動作について、図１〜図３を参照しながら説明する。   Next, operation | movement of the waste gas processing apparatus 1 which has the said structure is demonstrated, referring FIGS. 1-3.

ロータリキルン２の燃焼排ガスは、まず、冷却塔で冷却し、サイクロン４によって排ガスＧ１に含まれる粗粉（ダストＤ１）を回収し、第１バグフィルタ５によってサイクロン４からの排ガスＧ２に含まれる微粉（ダストＤ２）を回収する。   The combustion exhaust gas of the rotary kiln 2 is first cooled in a cooling tower, the coarse powder (dust D1) contained in the exhaust gas G1 is collected by the cyclone 4, and the fine powder contained in the exhaust gas G2 from the cyclone 4 is collected by the first bag filter 5. (Dust D2) is collected.

次に、第１バグフィルタ５からの排ガスＧ３に脱硫剤として消石灰粉等の酸性ガス処理剤ＧＴを添加して排ガスＧ３中のＳＯｘ濃度を低下させ、第２バグフィルタ６によって排ガスＧ３に含まれるダストＤ３を回収する。   Next, an acid gas treatment agent GT such as slaked lime powder is added as a desulfurizing agent to the exhaust gas G3 from the first bag filter 5 to reduce the SOx concentration in the exhaust gas G3, and the second bag filter 6 contains the exhaust gas G3. Dust D3 is collected.

上記回収されたダストＤ１〜Ｄ３は、ＨＭＸ処理工程１４において、塩化物及びアルカリを除去した後、鉛や亜鉛等を非鉄金属精錬原料として回収し、カルシウムを主成分とした回収後の残渣をセメント原料として再利用する。   In the HMX treatment step 14, the collected dusts D1 to D3 are obtained by removing chlorides and alkalis, collecting lead, zinc, and the like as non-ferrous metal refining raw materials, and collecting the recovered residue mainly composed of calcium as cement. Reuse as raw material.

一方、脱硫塔８において、活性コークスＡＣに第２バグフィルタ６からの排ガスＧ４を接触させ、排ガスＧ４に含まれるＳＯｘを活性コークスＡＣに硫酸として吸着させて除去する。さらに、脱硫塔８からの排ガスＧ５にアンモニアガス（ＮＨ3）を注入し、ＮＨ3によってＮＯｘを窒素に還元して無害化すると共に、活性コークスＡＣに排ガスＧ５を接触させ、排ガスＧ５に残留するＮＯｘを活性コークスＡＣに吸着させて除去する。この際、排ガスＧ４に含まれる水銀も活性コークスＡＣに吸着される。清浄化された排ガスＧ６は、煙突から大気へ放出される。 On the other hand, in the desulfurization tower 8, the exhaust gas G4 from the second bag filter 6 is brought into contact with the active coke AC, and SOx contained in the exhaust gas G4 is adsorbed and removed as sulfuric acid by the active coke AC. Further, ammonia gas (NH 3 ) is injected into the exhaust gas G5 from the desulfurization tower 8, and NOx is reduced to nitrogen by NH 3 to render it harmless, and the exhaust gas G5 is brought into contact with the activated coke AC and remains in the exhaust gas G5. NOx is adsorbed and removed by the activated coke AC. At this time, mercury contained in the exhaust gas G4 is also adsorbed to the activated coke AC. The cleaned exhaust gas G6 is discharged from the chimney to the atmosphere.

次に、再生塔１１に熱風を導入し、脱硫塔８から排出された活性コークスＡＣを加熱再生する。これによって、活性コークスＡＣから硫酸、水銀、アンモニウム塩等が脱離する。また、活性コークスＡＣは、脱硫塔８と再生塔１１との間を循環移動するが、その際摩耗して活性コークスＡＣの一部がダスト状となり、排ガスＧ６と共に再生塔１１から排出される。   Next, hot air is introduced into the regeneration tower 11, and the activated coke AC discharged from the desulfurization tower 8 is heated and regenerated. As a result, sulfuric acid, mercury, ammonium salt and the like are desorbed from the activated coke AC. Further, the activated coke AC circulates and moves between the desulfurization tower 8 and the regeneration tower 11. At this time, the activated coke AC is worn and part of the activated coke AC becomes dust, and is discharged from the regeneration tower 11 together with the exhaust gas G6.

次いで、再生塔１１から硫酸、水銀、アンモニウム塩等を含む排ガスＧ７を排ガス洗浄工程１２に導入し、図２のガス冷却塔２１で排ガスＧ７を冷却した後、第１洗浄塔２２で排ガスＧ８に水を噴霧して排ガスＧ７に含まれている水銀と活性コークスＡＣのダストが廃液Ｗ１へ移行して、廃液Ｗ１内で水銀が活性コークスＡＣのダストへ吸着する。これによって、廃液Ｗ１に水銀を吸着した活性コークスＡＣのダストが回収される。一方、第１洗浄塔２２の排ガスＧ９には、第２洗浄塔２３において、循環水ＣＷ及び水酸化ナトリウム溶液を噴霧し、排ガスＧ９に含まれる硫酸又は亜硫酸を中和した後、排ガスＧ１０としてロータリキルン２の排ガス処理系に戻す。   Next, exhaust gas G7 containing sulfuric acid, mercury, ammonium salt, etc. is introduced into the exhaust gas cleaning step 12 from the regeneration tower 11, and after the exhaust gas G7 is cooled by the gas cooling tower 21 of FIG. By spraying water, the mercury and the dust of the active coke AC contained in the exhaust gas G7 are transferred to the waste liquid W1, and the mercury is adsorbed to the dust of the active coke AC in the waste liquid W1. Thereby, the dust of the activated coke AC in which mercury is adsorbed on the waste liquid W1 is recovered. On the other hand, the exhaust gas G9 of the first cleaning tower 22 is sprayed with circulating water CW and a sodium hydroxide solution in the second cleaning tower 23 to neutralize sulfuric acid or sulfurous acid contained in the exhaust gas G9, and then rotary as exhaust gas G10. Return to kiln 2 exhaust gas treatment system.

次に、第１洗浄塔２２から排出された廃液Ｗ１に、図３に示すように、ｐＨ調整槽３１においてアルカリ（ＮａＯＨ等）を添加し、廃液Ｗ１に含まれる、ＳＯ2が水に溶けて生じた亜硫酸又は硫酸による後段の装置の腐食を防止し、沈降槽３２において、活性コークスＡＣのダストを沈降させる。 Next, as shown in FIG. 3, alkali (NaOH or the like) is added to the waste liquid W1 discharged from the first cleaning tower 22 in the pH adjustment tank 31, and SO 2 contained in the waste liquid W1 is dissolved in water. The subsequent apparatus is prevented from being corroded by the generated sulfurous acid or sulfuric acid, and the activated coke AC dust is settled in the settling tank 32.

反応槽３３において、沈降槽３２からの廃液Ｗ３に水銀キレート剤ＣＨを添加して撹拌し、沈降槽３２の沈降物及び反応槽３３での反応生成物からなるスラリーＳ１を汚泥槽３４に貯留し、汚泥槽３４からのスラリーＳ２を繊維ろ過器３５で固液分離する。繊維ろ過器３５で分離されたろ液を処理水槽３６に貯留し、分離された濃縮汚泥（水銀汚泥）を濃縮槽３７に貯留する。処理水槽３６に貯留したろ液は、繊維ろ過器３５において再利用する。また、繊維ろ過器３５での水銀キレートを含む逆洗水ＲＷは、濃縮槽３７に貯留し、水銀汚泥Ｗ４として系外で処理する。   In the reaction tank 33, the mercury chelating agent CH is added to the waste liquid W <b> 3 from the settling tank 32 and stirred, and the slurry S <b> 1 composed of the sediment in the settling tank 32 and the reaction product in the reaction tank 33 is stored in the sludge tank 34. The slurry S2 from the sludge tank 34 is solid-liquid separated by the fiber filter 35. The filtrate separated by the fiber filter 35 is stored in the treatment water tank 36, and the separated concentrated sludge (mercury sludge) is stored in the concentration tank 37. The filtrate stored in the treated water tank 36 is reused in the fiber filter 35. Further, the backwash water RW containing mercury chelate in the fiber filter 35 is stored in the concentration tank 37 and treated outside the system as mercury sludge W4.

以上のように、本実施の形態では、活性コークスＡＣを用いた脱硫塔８に付設されている再生塔１１から排出された排ガスＧ７に含まれるダストを回収し、回収したダストに含まれる水銀（金属水銀）を回収することができる。   As described above, in the present embodiment, dust contained in the exhaust gas G7 discharged from the regeneration tower 11 attached to the desulfurization tower 8 using the activated coke AC is recovered, and mercury ( Metallic mercury) can be recovered.

尚、上記実施の形態においては、エコセメントキルンの排ガス中の水銀を回収する場合を例示したが、本発明は、上記脱硫塔８及び脱硝塔９を標準装備している発電用ボイラ、高炉等にも適用することができ、従来廃棄するか、原料や燃料の一部として再利用されていた、活性コークス再生塔から排出されたガスに含まれるダストを回収し、該ダストから水銀（金属水銀）を回収することで、従来より水銀を効率よく低コストで回収することができる。   In the above embodiment, the case of recovering mercury in the exhaust gas of the ecocement kiln has been exemplified. However, the present invention includes a power generation boiler, a blast furnace, etc. equipped with the desulfurization tower 8 and the denitration tower 9 as standard equipment. The dust contained in the gas discharged from the activated coke regeneration tower, which has been disposed of in the past or reused as part of the raw material and fuel, is recovered, and mercury (metal mercury) is collected from the dust. ) Can be recovered more efficiently and at lower cost than before.

１ 排ガス処理装置
２ ロータリキルン
３ 冷却塔
４ サイクロン
５ 第１バグフィルタ
６ 第２バグフィルタ
８ 脱硫塔
９ 脱硝塔
１０ 煙突
１１ 再生塔
１２ 排ガス洗浄工程
１３ 水銀回収工程
１４ ＨＭＸ処理工程
１５ 最終排水処理工程
２１ ガス冷却塔
２２ 第１洗浄塔
２３ 第２洗浄塔
３１ ｐＨ調整槽
３２ 沈降槽
３３ 反応槽
３４ 汚泥槽
３５ 繊維ろ過器
３６ 処理水槽
３７ 濃縮槽
ＡＣ 活性コークス
ＣＨ 水銀キレート剤
ＣＷ 循環水
Ｄ１〜Ｄ３ ダスト
Ｇ１〜Ｇ９ 排ガス
ＧＴ 酸性ガス処理剤
Ｓ１〜Ｓ４ スラリー
ＲＷ 逆洗水
Ｗ１〜Ｗ４ 廃液 1 exhaust gas treatment device 2 rotary kiln 3 cooling tower 4 cyclone 5 first bug filter 6 second bug filter 8 desulfurization tower 9 denitration tower 10 chimney 11 regeneration tower 12 exhaust gas cleaning process 13 mercury recovery process 14 HMX treatment process 15 final wastewater treatment process 21 Gas cooling tower 22 1st washing tower 23 2nd washing tower 31 pH adjustment tank 32 Sedimentation tank 33 Reaction tank 34 Sludge tank 35 Fiber filter 36 Treated water tank 37 Concentration tank AC Active coke CH Mercury chelating agent CW Circulating water D1-D3 Dust G1-G9 Exhaust gas GT Acid gas treatment agent S1-S4 Slurry RW Backwash water W1-W4 Waste liquid

Claims (4)

活性コークスを用いた燃焼排ガスの乾式脱硫脱硝装置に付設されている活性コークス再生塔から排出されたガスに含まれるダストを回収し、
該回収したダストに含まれる水銀を回収することを特徴とする排ガス中の水銀回収方法。 Dust contained in the gas discharged from the activated coke regeneration tower attached to the dry desulfurization and denitrification equipment for combustion exhaust gas using activated coke is recovered,
A method for recovering mercury in exhaust gas, wherein the mercury contained in the recovered dust is recovered. 前記排ガスに水を噴霧することにより、前記ダストを回収することを特徴とする請求項１に記載の排ガス中の水銀回収方法。   The method for recovering mercury in exhaust gas according to claim 1, wherein the dust is recovered by spraying water on the exhaust gas. 前記ダストを、前記排ガスに噴霧した水を噴霧して得られた廃液に含まれるイオン性水銀を吸着した吸着物と共に回収することを特徴とする請求項２に記載の排ガス中の水銀回収方法。   The method for recovering mercury in exhaust gas according to claim 2, wherein the dust is recovered together with an adsorbate adsorbing ionic mercury contained in a waste liquid obtained by spraying water sprayed on the exhaust gas. 前記乾式脱硫脱硝装置は、発電用ボイラ、高炉又はエコセメントを焼成するセメントキルンの排ガスを処理することを特徴とする請求項１、２又は３に記載の排ガス中の水銀回収方法。   The method for recovering mercury in exhaust gas according to claim 1, 2 or 3, wherein the dry desulfurization denitration apparatus treats exhaust gas from a power kiln, blast furnace, or cement kiln that fires eco-cement.
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