JP2019055374A - Exhaust gas treatment equipment and exhaust gas treatment method - Google Patents

Exhaust gas treatment equipment and exhaust gas treatment method Download PDF

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JP2019055374A
JP2019055374A JP2017181964A JP2017181964A JP2019055374A JP 2019055374 A JP2019055374 A JP 2019055374A JP 2017181964 A JP2017181964 A JP 2017181964A JP 2017181964 A JP2017181964 A JP 2017181964A JP 2019055374 A JP2019055374 A JP 2019055374A
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exhaust gas
mercury
gas treatment
bag filter
dust collection
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裕己 千葉
Hiromi Chiba
裕己 千葉
浩司 鎌田
Koji Kamata
浩司 鎌田
貴之 木村
Takayuki Kimura
貴之 木村
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Taiheiyo Cement Corp
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Abstract

To provide exhaust gas treatment equipment and an exhaust gas treatment method by which both treatments of removal of SOx and removal of Hg can be efficiently performed.SOLUTION: Exhaust gas treatment equipment 1 comprises: a spray device 4 which sprays an alkaline aqueous solution to an exhaust gas G2 which contains SOx and Hg; and a dust collection adsorber which performs dust collection of an exhaust gas G3 to which the alkaline aqueous solution is sprayed and adsorption of Hg from the exhaust gas at a later state of the spray device. The dust collection adsorber is a bag filter 5, and may have an adsorbent filter 52 which adsorbs Hg in downstream of a filter cloth 51. The dust collection adsorber is so made as to be a bag filter and may have a filter cloth in which an adsorbent for Hg is assembled, or may be configured from a bag filter and an adsorption tower which is provided at a later state of the bag filter and adsorbs Hg. The alkaline aqueous solution may be one or more kinds selected from ammonia water, aqueous sodium hydroxide and calcium hydroxide aqueous solution.SELECTED DRAWING: Figure 1

Description

本発明は、ＳＯｘ及び水銀を含有する排ガスを処理する装置及び方法に関する。   The present invention relates to an apparatus and method for treating exhaust gas containing SOx and mercury.

工場等で排出される排ガス中の有害物質を除去すべく、様々な手法が用いられている。例えば、特許文献１には、排ガス中のＳＯｘの除去を目的として、排ガスにアンモニアを添加する技術が記載されている。具体的には、排ガス中の硫酸ミストを捕集する電気集塵手段を備えたＳＯｘを含有する排ガスの処理システムであって、電気集塵手段に排ガスを導入する前段で排ガス中にアンモニア水と炭酸水素アンモニア水の混合液を供給する無機炭酸手段を備えている。このように、アンモニアを用いてＳＯｘやＮＯｘを除去することは、従来広く行われている。   Various methods are used to remove harmful substances in exhaust gas discharged from factories and the like. For example, Patent Document 1 describes a technique of adding ammonia to exhaust gas for the purpose of removing SOx in the exhaust gas. Specifically, it is an exhaust gas treatment system containing SOx equipped with an electric dust collecting means for collecting sulfuric acid mist in the exhaust gas, and ammonia water is contained in the exhaust gas before the exhaust gas is introduced into the electric dust collecting means. Inorganic carbonic acid means for supplying a mixed liquid of aqueous hydrogen carbonate and ammonia is provided. Thus, removal of SOx and NOx using ammonia has been widely performed in the past.

また、特許文献２には、排ガス中の水銀の除去を目的として、活性炭層を内蔵する吸着塔を有する排ガス処理装置が記載されている。このように、活性炭を用いて水銀を除去することも、従来広く行われている技術である。   Patent Document 2 describes an exhaust gas treatment apparatus having an adsorption tower having an activated carbon layer for the purpose of removing mercury in the exhaust gas. Thus, removal of mercury using activated carbon is also a widely used technique.

特開２０１２−２２３７１８号公報JP 2012-223718 A 特開２０１６−１８５５１０号公報JP-A-2006-185510

ところで、セメント焼成装置からの排ガス等、ＳＯｘと水銀を含有する排ガスを処理するには、ＳＯｘの除去と水銀の除去の双方の処理を効率的に行うことが望ましい。   By the way, in order to treat exhaust gas containing SOx and mercury, such as exhaust gas from a cement baking apparatus, it is desirable to efficiently perform both SOx removal and mercury removal treatments.

そこで、本発明は、ＳＯｘの除去と水銀の除去の両方の処理を効率的に行うことができる排ガス処理装置及び排ガス処理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 an exhaust gas treatment apparatus and an exhaust gas treatment method capable of efficiently performing both SOx removal and mercury removal treatments.

上記目的を達成するため、本発明は、排ガス処理装置であって、ＳＯｘ及び水銀を含有する排ガスにアルカリ性水溶液を噴霧する噴霧装置と、該噴霧装置の後段において、前記アルカリ性溶液が噴霧された排ガスの集塵と、該排ガスからの水銀の吸着を行う集塵吸着装置とを備えることを特徴とする。本発明によれば、ＳＯｘの除去と水銀の除去の両方の処理を効率的に行うことができる。   In order to achieve the above object, the present invention provides an exhaust gas treatment apparatus, which is a spray apparatus for spraying an alkaline aqueous solution to exhaust gas containing SOx and mercury, and an exhaust gas in which the alkaline solution is sprayed in a subsequent stage of the spray apparatus And a dust collection adsorbing device for adsorbing mercury from the exhaust gas. According to the present invention, both the removal of SOx and the removal of mercury can be performed efficiently.

上記発明において、前記集塵吸着装置はバグフィルタであり、ろ布の下流に水銀を吸着する吸着剤フィルタを有するものとすることができる。   In the above invention, the dust collecting adsorption device is a bag filter, and may have an adsorbent filter that adsorbs mercury downstream of the filter cloth.

上記発明において、前記集塵吸着装置はバグフィルタであり、水銀の吸着剤が組み込まれたろ布を有するものとすることができる。   In the above invention, the dust collecting adsorption device is a bag filter, and may have a filter cloth in which a mercury adsorbent is incorporated.

上記発明において、前記集塵吸着装置は、バグフィルタと、前記バグフィルタの後段に設けられた水銀を吸着する吸着塔により構成されるものとすることができる。   In the above invention, the dust collecting adsorption device may be constituted by a bag filter and an adsorption tower for adsorbing mercury provided at a subsequent stage of the bag filter.

また、本発明は、排ガス処理方法であって、ＳＯｘ及び水銀を含有する排ガスにアルカリ性水溶液を噴霧し、該アルカリ性溶液が噴霧された排ガスの集塵と、該排ガスからの水銀の吸着を行うことを特徴とする。本発明によれば、ＳＯｘの除去と水銀の除去の両方の処理を効率的に行うことができる。   The present invention also relates to an exhaust gas treatment method, wherein an alkaline aqueous solution is sprayed on exhaust gas containing SOx and mercury, and dust collection of the exhaust gas sprayed with the alkaline solution and adsorption of mercury from the exhaust gas are performed. It is characterized by. According to the present invention, both the removal of SOx and the removal of mercury can be performed efficiently.

上記発明において、前記アルカリ性溶液は、アンモニア水、水酸化ナトリウム水溶液及び水酸化カルシウム水溶液から選択される１種以上とすることができる。   In the said invention, the said alkaline solution can be made into 1 or more types selected from aqueous ammonia, sodium hydroxide aqueous solution, and calcium hydroxide aqueous solution.

以上のように、本発明によれば、ＳＯｘの除去と水銀の除去の両方の処理を効率的に行うことができる。   As described above, according to the present invention, both the removal of SOx and the removal of mercury can be performed efficiently.

本発明の実施形態に係る排ガス処理装置を備えたセメント製造装置の一部を示す全体構成図である。It is a whole block diagram which shows a part of cement manufacturing apparatus provided with the exhaust gas processing apparatus which concerns on embodiment of this invention.

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、以下の説明では、セメント焼成装置の排ガスを処理する場合を例にとって説明する。   Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following description, a case where exhaust gas from a cement firing apparatus is treated will be described as an example.

図１は、本発明の実施形態に係る排ガス処理装置１を備えたセメント製造装置の一部を示す全体構成図であり、この排ガス処理装置１は、ロータリードライヤー２の排気ダクト３にアンモニア水を噴霧するアンモニア水噴霧装置４と、アンモニア水噴霧装置４の後段（下流側）に設置されたバグフィルタ５とを備える。   FIG. 1 is an overall configuration diagram showing a part of a cement manufacturing apparatus provided with an exhaust gas treatment apparatus 1 according to an embodiment of the present invention. The exhaust gas treatment apparatus 1 supplies ammonia water to an exhaust duct 3 of a rotary dryer 2. An ammonia water spraying device 4 for spraying and a bag filter 5 installed at a subsequent stage (downstream side) of the ammonia water spraying device 4 are provided.

ロータリードライヤー２は、セメントキルン（不図示）からの排ガス（キルン排ガス）Ｇ１を用いてセメント原料Ｍ１を乾燥させる乾燥機である。排ガスＧ１には、ＳＯｘと気体状の水銀が含まれている。乾燥したセメント原料（乾燥原料）Ｍ２は、ロータリードライヤー２から排出され、セメントの製造に用いられる。ロータリードライヤー２を通過した排ガスＧ２は、排気ダクト３へと供給される。排ガスＧ２も、排ガスＧ１と同様に、ＳＯｘと気体状の水銀を含んでいる。排気ダクト３は、バグフィルタ５を経て煙突６へと延設される。排気ダクト３は、ＳＯｘやアンモニア水への耐腐食性を有する材料により形成される。   The rotary dryer 2 is a dryer that dries the cement raw material M1 using exhaust gas (kiln exhaust gas) G1 from a cement kiln (not shown). The exhaust gas G1 contains SOx and gaseous mercury. The dried cement raw material (dry raw material) M2 is discharged from the rotary dryer 2 and used for manufacturing cement. The exhaust gas G2 that has passed through the rotary dryer 2 is supplied to the exhaust duct 3. Similarly to the exhaust gas G1, the exhaust gas G2 contains SOx and gaseous mercury. The exhaust duct 3 extends to the chimney 6 through the bag filter 5. The exhaust duct 3 is formed of a material that has corrosion resistance to SOx or ammonia water.

アンモニア水噴霧装置４は、排気ダクト３内を通過する排ガスＧ２にアンモニア水を噴霧する装置であって、噴霧ノズル等を用いて排気ダクト３内の排ガスＧ２の全体にわたって均一に霧状のアンモニア水を吹き付ける。   The ammonia water spraying device 4 is a device that sprays ammonia water on the exhaust gas G2 passing through the exhaust duct 3, and is uniformly atomized over the entire exhaust gas G2 in the exhaust duct 3 using a spray nozzle or the like. Spray.

バグフィルタ５は、排ガスＧ３からキルンダストと共に、アンモニア水とＳＯｘとの反応生成物及び水銀を除去する集塵吸着装置である。バグフィルタ５は、キルンダスト及び反応生成物の微粒子を捕捉するろ布５１と、ろ布５１の下流に水銀を吸着する吸着剤フィルタ５２を有する。   The bag filter 5 is a dust collecting and adsorbing device that removes a reaction product of ammonia water and SOx and mercury together with kiln dust from the exhaust gas G3. The bag filter 5 includes a filter cloth 51 that captures kiln dust and reaction product fine particles, and an adsorbent filter 52 that adsorbs mercury downstream of the filter cloth 51.

次に、上記構成を有する排ガス処理装置１の動作について説明する。   Next, operation | movement of the waste gas processing apparatus 1 which has the said structure is demonstrated.

ロータリードライヤー２に、セメント原料Ｍ１が投入されると共に、セメントキルン（不図示）から高温の排ガスＧ１が導入され、セメント原料Ｍ１の乾燥が行われる。乾燥後のセメント原料（乾燥原料）Ｍ２がロータリードライヤー２から排出されると共に、排ガスＧ２が排気ダクト３を通じて排出される。   The rotary feed dryer 2 is fed with the cement raw material M1, and is introduced with high-temperature exhaust gas G1 from a cement kiln (not shown) to dry the cement raw material M1. The dried cement material (dry material) M2 is discharged from the rotary dryer 2 and the exhaust gas G2 is discharged through the exhaust duct 3.

次に、排気ダクト３内で、排ガスＧ２に対してアンモニア水噴霧装置４によってアンモニア水を噴霧する。アンモニア水が噴霧されることで、アンモニアが排ガスＧ２中のＳＯｘと反応し、反応生成物が微粒子として排ガスＧ３中に析出する。例えば、ＳＯｘが三酸化硫黄ＳＯ3である場合には、アンモニアＮＨ3及び水Ｈ2Ｏと反応することにより、硫酸アンモニウム（硫安）（ＮＨ4）2ＳＯ4又は硫酸水素アンモニウムＮＨ4ＨＳＯ4が生成し、微粒子として析出する。アンモニア水の噴霧量は、煙突６から排出される排ガスＧ４中の水銀濃度に応じて調整する。 Next, in the exhaust duct 3, ammonia water is sprayed on the exhaust gas G <b> 2 by the ammonia water spray device 4. By spraying ammonia water, ammonia reacts with SOx in the exhaust gas G2, and the reaction product is deposited in the exhaust gas G3 as fine particles. For example, when SOx is sulfur trioxide SO 3 , ammonium sulfate (ammonium sulfate) (NH 4 ) 2 SO 4 or ammonium hydrogen sulfate NH 4 HSO 4 is produced by reaction with ammonia NH 3 and water H 2 O. And deposited as fine particles. The spray amount of the ammonia water is adjusted according to the mercury concentration in the exhaust gas G4 discharged from the chimney 6.

アンモニア水噴霧装置４によるアンモニア水の噴霧によって析出した反応生成物を含む排ガスＧ３は、排ガスＧ２と比べて温度が低下した状態となっているが、排ガスＧ３中の水銀は気化した状態を保っている。尚、アンモニア水の噴霧により排ガスＧ３の水分が増加するが、アンモニアとＳＯｘの反応によりＳＯｘが除去されているため、酸露点腐食を防止することができる。   The exhaust gas G3 containing the reaction product deposited by the spraying of the ammonia water by the ammonia water spraying device 4 is in a state where the temperature is lower than that of the exhaust gas G2, but the mercury in the exhaust gas G3 is kept in a vaporized state. Yes. In addition, although the water | moisture content of waste gas G3 increases by spraying of ammonia water, since SOx is removed by reaction of ammonia and SOx, acid dew point corrosion can be prevented.

次に、排ガスＧ３がバグフィルタ５へと導入される。バグフィルタ５では、まずろ布５１により排ガスＧ３中のキルンダストと、アンモニア水とＳＯｘの反応生成物とが除去される。さらに、吸着剤フィルタ５２により排ガスＧ３中の水銀が除去される。   Next, the exhaust gas G3 is introduced into the bag filter 5. In the bag filter 5, the kiln dust and the reaction product of ammonia water and SOx in the exhaust gas G3 are first removed by the filter cloth 51. Further, mercury in the exhaust gas G3 is removed by the adsorbent filter 52.

上述したように、排ガスＧ３はアンモニア水の噴霧により冷却されているため、バグフィルタ５の吸着剤フィルタ５２における水銀除去効率が向上し、吸着された水銀の再脱離も起こりにくい。また、アンモニア水の噴霧量が過剰であった場合にも、吸着剤フィルタ５２によりアンモニアが吸着されるため、アンモニアが大気中に排出されることはない。バグフィルタ５によりキルンダスト、反応生成物微粒子及び水銀が除去された排ガスＧ４は、煙突６へと導かれ、煙突６から大気中に放出される。   As described above, since the exhaust gas G3 is cooled by spraying ammonia water, the mercury removal efficiency in the adsorbent filter 52 of the bag filter 5 is improved, and resorption of the adsorbed mercury is less likely to occur. Even when the amount of sprayed ammonia water is excessive, ammonia is not adsorbed by the adsorbent filter 52, so that ammonia is not discharged into the atmosphere. The exhaust gas G4 from which kiln dust, reaction product fine particles and mercury have been removed by the bag filter 5 is guided to the chimney 6 and released from the chimney 6 into the atmosphere.

以上のように、排ガス処理装置１によれば、ＳＯｘの除去と水銀の除去の両方の処理を効率的に行うことができる。   As described above, according to the exhaust gas treatment apparatus 1, both the removal of SOx and the removal of mercury can be performed efficiently.

尚、上記実施形態においては、セメント製造装置のロータリードライヤーから排出されるガスを処理したが、本発明はこれに限らず、ロータリードライヤー以外の装置から排出されるキルン排ガスを処理することもでき、キルン排ガスに限らず、ＳＯｘと水銀を含有する排ガスであれば本発明を適用することができる。   In the above embodiment, the gas discharged from the rotary dryer of the cement manufacturing apparatus is processed, but the present invention is not limited to this, and the kiln exhaust gas discharged from an apparatus other than the rotary dryer can also be processed. The present invention is applicable not only to kiln exhaust gas but also to exhaust gas containing SOx and mercury.

さらに、上述した実施形態においては、水銀吸着除去のための吸着剤フィルタ５２がバグフィルタ５内に設けられていたが、本発明においてはこれに限らず、ろ布５１に水銀の吸着剤を組み込んだ態様であってもよい。   Furthermore, in the embodiment described above, the adsorbent filter 52 for removing mercury by adsorption is provided in the bag filter 5. However, in the present invention, the present invention is not limited to this, and a mercury adsorbent is incorporated in the filter cloth 51. It may be a mode.

また、水銀吸着除去のための機構がバグフィルタ５と別体であってもよく、例えばバグフィルタ５の後段に設けられた水銀を吸着する吸着塔であってもよい。   Further, the mechanism for removing mercury by adsorption may be separate from the bag filter 5, for example, an adsorption tower for adsorbing mercury provided at the subsequent stage of the bag filter 5.

さらに、上述した実施形態においてはＳＯｘの除去のためにアンモニア水を噴霧していたが、本発明においてはＳＯｘと反応して反応生成物が微粒子として排ガスＧ３中に析出するアルカリ性水溶液であれば好適に用いることができ、例えば水酸化ナトリウム水溶液や水酸化カルシウム水溶液等も用いることができる。   Furthermore, although ammonia water was sprayed for removing SOx in the above-described embodiment, any alkaline aqueous solution that reacts with SOx and precipitates in the exhaust gas G3 as a reaction product in the present invention is suitable. For example, an aqueous sodium hydroxide solution or an aqueous calcium hydroxide solution can also be used.

１ 排ガス処理装置
２ ロータリードライヤー
３ 排気ダクト
４ アンモニア水噴霧装置
５ バグフィルタ
６ 煙突
５１ ろ布
５２ 吸着剤フィルタ
Ｇ１〜Ｇ４ 排ガス
Ｍ１ セメント原料
Ｍ２ 乾燥原料 DESCRIPTION OF SYMBOLS 1 Exhaust gas processing apparatus 2 Rotary dryer 3 Exhaust duct 4 Ammonia water spray apparatus 5 Bag filter 6 Chimney 51 Filter cloth 52 Adsorbent filter G1-G4 Exhaust gas M1 Cement raw material M2 Drying raw material

Claims (6)

ＳＯｘ及び水銀を含有する排ガスにアルカリ性水溶液を噴霧する噴霧装置と、
該噴霧装置の後段において、前記アルカリ性溶液が噴霧された排ガスの集塵と、該排ガスからの水銀の吸着を行う集塵吸着装置とを備えることを特徴とする排ガス処理装置。 A spraying device for spraying an alkaline aqueous solution to exhaust gas containing SOx and mercury;
An exhaust gas treatment apparatus comprising: dust collection of exhaust gas sprayed with the alkaline solution; and a dust collection adsorption device for adsorbing mercury from the exhaust gas at a subsequent stage of the spray device. 前記集塵吸着装置はバグフィルタであり、ろ布の下流側に水銀を吸着する吸着剤フィルタを有することを特徴とする請求項１に記載の排ガス処理装置。   The exhaust gas treatment apparatus according to claim 1, wherein the dust collection adsorption device is a bag filter, and has an adsorbent filter that adsorbs mercury on the downstream side of the filter cloth. 前記集塵吸着装置はバグフィルタであり、水銀の吸着剤が組み込まれたろ布を有することを特徴とする請求項１に記載の排ガス処理装置。   The exhaust gas treatment apparatus according to claim 1, wherein the dust collection adsorption device is a bag filter and has a filter cloth in which a mercury adsorbent is incorporated. 前記集塵吸着装置は、バグフィルタと、前記バグフィルタの後段に設けられた水銀を吸着する吸着塔で構成されることを特徴とする請求項１に記載の排ガス処理装置。   2. The exhaust gas treatment apparatus according to claim 1, wherein the dust collection adsorption device includes a bag filter and an adsorption tower that adsorbs mercury provided at a subsequent stage of the bag filter. ＳＯｘ及び水銀を含有する排ガスにアルカリ性水溶液を噴霧し、
該アルカリ性溶液が噴霧された排ガスの集塵と、該排ガスからの水銀の吸着を行うことを特徴とする排ガス処理方法。 Spraying alkaline aqueous solution on exhaust gas containing SOx and mercury,
An exhaust gas treatment method comprising collecting dust from exhaust gas sprayed with the alkaline solution and adsorbing mercury from the exhaust gas. 前記アルカリ性溶液は、アンモニア水、水酸化ナトリウム水溶液及び水酸化カルシウム水溶液から選択される１種以上であることを特徴とする請求項５に記載の排ガス処理方法。   The exhaust gas treatment method according to claim 5, wherein the alkaline solution is at least one selected from ammonia water, a sodium hydroxide aqueous solution, and a calcium hydroxide aqueous solution.
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CN115121085A (en) * 2021-03-29 2022-09-30 宝山钢铁股份有限公司 VOC treatment system and treatment method in coking production process

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JP2002035523A (en) * 2000-07-28 2002-02-05 Osaka Gas Co Ltd Bag filter
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Publication number Priority date Publication date Assignee Title
JPS647932A (en) * 1987-06-30 1989-01-11 Nippon Kokan Kk Method for removing harmful gas in exhaust gas
JP2002035523A (en) * 2000-07-28 2002-02-05 Osaka Gas Co Ltd Bag filter
JP2003126654A (en) * 2001-10-19 2003-05-07 Sumitomo Heavy Ind Ltd Flue gas treatment apparatus
US7040891B1 (en) * 2005-06-08 2006-05-09 Giuliani Anthony J System for reducing fuel consumption and pollutant emissions from asphalt cement production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115121085A (en) * 2021-03-29 2022-09-30 宝山钢铁股份有限公司 VOC treatment system and treatment method in coking production process
CN115121085B (en) * 2021-03-29 2023-06-13 宝山钢铁股份有限公司 VOC (volatile organic compound) treatment system and method in coking production process

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