JP7074425B2 - Mercury removal method from exhaust gas and waste treatment equipment using this method - Google Patents

Mercury removal method from exhaust gas and waste treatment equipment using this method Download PDF

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JP7074425B2
JP7074425B2 JP2017028068A JP2017028068A JP7074425B2 JP 7074425 B2 JP7074425 B2 JP 7074425B2 JP 2017028068 A JP2017028068 A JP 2017028068A JP 2017028068 A JP2017028068 A JP 2017028068A JP 7074425 B2 JP7074425 B2 JP 7074425B2
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exhaust gas
mercury
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俊一 三島
正人 遠藤
昌幸 山本
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Metawater Co Ltd
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Description

本発明は、廃棄物焼却炉の排ガスからの水銀除去方法及びこの方法を用いた廃棄物処理装置に関するものである。 The present invention relates to a method for removing mercury from the exhaust gas of a waste incinerator and a waste treatment apparatus using this method.

廃棄物焼却炉の排ガス中には、廃棄物由来の水銀が含まれていることがある。このような排ガス中に含まれる水銀を除去するために、活性炭などの吸着剤を用いることが一般的である。例えば特許文献１には、キルンで発生した排ガスを吸着塔に導いて水銀などの有害物質を吸着させる方法が開示されている。またこの特許文献１には、吸着塔を複数台並列に配置し、排ガス中の水銀の測定結果に基づいて流路を切り替えることも記載されている。 The exhaust gas from a waste incinerator may contain mercury derived from waste. In order to remove mercury contained in such exhaust gas, it is common to use an adsorbent such as activated carbon. For example, Patent Document 1 discloses a method of guiding exhaust gas generated in a kiln to an adsorption tower to adsorb harmful substances such as mercury. Further, Patent Document 1 also describes that a plurality of adsorption towers are arranged in parallel and the flow path is switched based on the measurement result of mercury in the exhaust gas.

一般に、水銀の吸着塔は使用温度が高くないことや、予め排ガス中から灰分等を取り除いておく必要があることなどの理由によって、排煙処理塔（スクラバ）の後段に配置されることが多い。しかし排煙処理塔の出口では排ガス中の水蒸気が飽和状態となるため、わずかでも温度が低下すると吸着剤の表面で結露が発生し、結露水が水銀の吸着を阻害してしまうという問題があった。 Generally, the mercury adsorption tower is often placed after the smoke exhaust treatment tower (scrubber) because the operating temperature is not high and it is necessary to remove ash from the exhaust gas in advance. .. However, since the water vapor in the exhaust gas becomes saturated at the outlet of the flue gas treatment tower, there is a problem that dew condensation occurs on the surface of the adsorbent if the temperature drops even slightly, and the dew water inhibits the adsorption of mercury. rice field.

特開２００９－２０２１０６号公報Japanese Unexamined Patent Publication No. 2009-202106

従って本発明の目的は上記した従来の問題点を解決し、排煙処理塔の後段に水銀吸着塔を配置した場合にも、結露水による水銀の吸着阻害を生ずることのない排ガスからの水銀除去方法及びこの方法を用いた廃棄物処理装置を提供することである。 Therefore, an object of the present invention solves the above-mentioned conventional problems, and even when a mercury adsorption tower is arranged after the flue gas treatment tower, mercury is removed from the exhaust gas without causing the adsorption inhibition of mercury by the dew water. It is to provide a method and a waste treatment apparatus using this method.

上記の課題を解決するためになされた本発明は、廃棄物焼却炉からの排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔の後段に水銀吸着塔を配置して、排ガスに含まれる水銀を除去する排ガスからの水銀除去方法であって、排煙処理塔よりも後段で排ガス中の水銀濃度を測定し、水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ、水銀吸着塔に排ガスを供給し、かつ、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておくことを特徴とするものである。 The present invention made to solve the above-mentioned problems is the latter stage of the smoke exhaust treatment tower in which the exhaust gas from the waste incinerator is brought into contact with the smoke wash water to absorb SO X and NO X into the smoke wash water and remove them. It is a method of removing mercury from exhaust gas by arranging a mercury adsorption tower in the exhaust gas. The mercury concentration in the exhaust gas is measured after the flue gas treatment tower, and the mercury concentration is set to the set value. When it exceeds, the exhaust gas is supplied to the mercury adsorption tower while heating the mercury adsorption tower with high temperature air, and the exhaust gas treated by the mercury adsorption tower is attracted to the smoke stack prior to supplying the exhaust gas to the mercury adsorption tower. It is characterized in that the attractive force of the attracting fan is made stronger than that during normal operation .

本発明においては、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておく。また本発明においては、水銀吸着塔と並列にバイパスラインを設け、排ガス中の水銀濃度が設定値よりも低いときには、このバイパスラインを通じて排ガスを煙突に送ることが好ましく、このバイパスライン及び水銀吸着塔を、排ガスを煙突に誘引する誘引ファンの出口側に接続し、結露の発生を防止することがより好ましい。また、排ガス中の水銀濃度の測定を、煙突で行うことができる。なお、前記高温空気として、白煙防止空気を用いることができる。 In the present invention, prior to supplying the exhaust gas to the mercury adsorption tower, the attraction force of the attraction fan that attracts the exhaust gas treated by the mercury adsorption tower to the chimney is made stronger than in the normal operation . Further, in the present invention, it is preferable to provide a bypass line in parallel with the mercury adsorption tower, and when the mercury concentration in the exhaust gas is lower than the set value, it is preferable to send the exhaust gas to the chimney through this bypass line. Is more preferably connected to the outlet side of the attraction fan that attracts the exhaust gas to the chimney to prevent the occurrence of dew condensation. In addition, the mercury concentration in the exhaust gas can be measured with a chimney. As the high temperature air, white smoke prevention air can be used.

さらに、上記の課題を解決するためになされた本発明の廃棄物処理装置は、廃棄物焼却炉と、廃棄物焼却炉からの排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔とを含む廃棄物処理装置であって、排煙処理塔の後段に配置された水銀吸着塔と、排煙処理塔よりも後段に配置された水銀濃度計と、排ガス中の水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ、水銀吸着塔に排ガスを供給する制御装置とを備え、この制御装置は、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておく機能を備えたものであることを特徴とするものである。 Further, in the waste treatment apparatus of the present invention made to solve the above problems, the waste incinerator and the exhaust gas from the waste incinerator are brought into contact with the smoke wash water to wash SOX and NOX . It is a waste treatment device including a flue gas treatment tower that absorbs and removes it by water, and has a mercury adsorption tower arranged after the flue gas treatment tower and a mercury concentration arranged after the flue gas treatment tower. It is equipped with a meter and a control device that supplies the exhaust gas to the mercury adsorption tower while heating the mercury adsorption tower with high-temperature air when the mercury concentration in the exhaust gas exceeds the set value. This control device is a mercury adsorption tower. It is characterized by having a function to make the attraction force of the attraction fan that attracts the exhaust gas treated by the mercury adsorption tower to the smoke stack stronger than that during normal operation before supplying the exhaust gas to the smoke. ..

本発明の排ガスからの水銀除去方法によれば、排ガス中の水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ水銀吸着塔に排ガスを供給するため、吸着剤に結露が発生することがなくなり、吸着剤が乾燥した状態で排ガス中の水銀を吸着させることができる。したがって結露水による水銀の吸着阻害を生ずることがない。しかも、排ガス中の水銀濃度が設定値を超えない場合には水銀吸着塔に排ガスは供給されないので、吸着剤の寿命を延ばすことができる。 According to the method for removing mercury from the exhaust gas of the present invention, when the mercury concentration in the exhaust gas exceeds a set value, the exhaust gas is supplied to the exhaust gas while heating the mercury adsorption tower with high temperature air, so that it is used as an adsorbent. Condensation does not occur, and mercury in the exhaust gas can be adsorbed in a dry state of the adsorbent. Therefore, the adsorption of mercury is not inhibited by the dew condensation water. Moreover, when the mercury concentration in the exhaust gas does not exceed the set value, the exhaust gas is not supplied to the mercury adsorption tower, so that the life of the adsorbent can be extended.

また、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておくことにより、切り替え時における廃棄物焼却炉の急激な圧力変動を緩和することができる。さらに、水銀吸着塔と並列に設けたバイパスラインを排ガスを煙突に誘引する誘引ファンの出口側に接続すれば、誘引ファンの断熱圧縮効果により排ガス温度が上昇するので、結露の発生を防止することができる。 In addition, prior to supplying the exhaust gas to the mercury adsorption tower, the attraction of the attraction fan that attracts the exhaust gas treated by the mercury adsorption tower to the chimney is made stronger than during normal operation, so that the waste incinerator at the time of switching is used. Sudden pressure fluctuations can be mitigated. Furthermore, if a bypass line provided in parallel with the mercury adsorption tower is connected to the outlet side of the attracting fan that attracts the exhaust gas to the chimney, the exhaust gas temperature will rise due to the adiabatic compression effect of the attracting fan, so the occurrence of dew condensation should be prevented. Can be done.

また本発明の廃棄物処理装置は、排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔の後段に配置された水銀吸着塔と、排煙処理塔よりも後段に配置された水銀濃度計と、排ガス中の水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ、水銀吸着塔に排ガスを供給する制御装置とを備えたものであるため、上記した排ガスからの水銀除去を確実に実施することができる。 Further, the waste treatment apparatus of the present invention has a mercury adsorption tower arranged at the rear stage of the flue gas treatment tower for contacting the exhaust gas with the flue gas and absorbing SOX and NOX in the flue gas to remove the exhaust gas. A mercury densitometer located after the smoke treatment tower and a control device that supplies exhaust gas to the exhaust gas while heating the mercury adsorption tower with high-temperature air when the mercury concentration in the exhaust gas exceeds the set value. Therefore, it is possible to reliably remove mercury from the exhaust gas described above.

本発明の第１の実施形態を説明する概略図である。It is a schematic diagram explaining the 1st Embodiment of this invention. 本発明の第２の実施形態を説明する概略図である。It is a schematic diagram explaining the 2nd Embodiment of this invention.

以下に、図面を参照しつつ本発明の実施形態を説明する。
図１は本発明の第１の実施形態の概略図であり、１は廃棄物焼却炉、２はこの廃棄物焼却炉１に廃棄物である汚泥を投入するための汚泥ポンプである。本実施形態の廃棄物焼却炉１は下水脱水汚泥を８５０℃以上の高温で焼却する流動床炉であり、炉底部の散気手段３から流動空気を吹き込むことにより流動媒体を流動させて高温の砂層を形成し、投入された脱水汚泥を瞬時に燃焼させるものである。しかし本発明においては廃棄物焼却炉１の種類は流動床炉に限定されるものではなく、任意の形式の焼却炉とすることができる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of the first embodiment of the present invention, in which 1 is a waste incinerator, and 2 is a sludge pump for charging sludge, which is waste, into the waste incinerator 1. The waste incinerator 1 of the present embodiment is a fluidized bed incinerator that incinerates sewage dehydrated sludge at a high temperature of 850 ° C. or higher. It forms a sand layer and instantly burns the charged dehydrated sludge. However, in the present invention, the type of the waste incinerator 1 is not limited to the fluidized bed furnace, and any type of incinerator can be used.

廃棄物焼却炉１からの排ガスは、まず流動空気予熱器４において流動空気ブロワ５から供給される流動空気を加熱し、次に白煙防止器６において白煙防止ファン７から供給される白煙防止空気を加熱する。加熱された流動空気は前記した散気手段３に供給され、加熱された白煙防止空気はダクト８により後段に送られ、高温空気として使用される。 The exhaust gas from the waste incinerator 1 first heats the fluidized air supplied from the fluidized air blower 5 in the fluidized air preheater 4, and then the white smoke supplied from the white smoke prevention fan 7 in the white smoke inhibitor 6. Heat the preventive air. The heated fluidized air is supplied to the above-mentioned air diffuser means 3, and the heated white smoke prevention air is sent to the subsequent stage by the duct 8 and used as high temperature air.

流動空気予熱器４と白煙防止器６とにおいて空気を加熱することにより排ガスは熱を奪われ温度が低下するが、その温度はなお数百℃であるため、冷却塔９においてさらに冷却される。冷却塔９はノズル１０から工水を散布し、その蒸発熱を排ガスから奪うことによって排ガスを冷却する塔である。この冷却塔９により冷却された排ガスは集塵機１１に送られる。 By heating the air in the fluidized air preheater 4 and the white smoke preventer 6, the exhaust gas is deprived of heat and the temperature is lowered, but since the temperature is still several hundred ° C., it is further cooled in the cooling tower 9. .. The cooling tower 9 is a tower that cools the exhaust gas by spraying the work water from the nozzle 10 and removing the heat of vaporization from the exhaust gas. The exhaust gas cooled by the cooling tower 9 is sent to the dust collector 11.

集塵機１１はフィルタエレメントとして濾布を使用するバグフィルタ、またはフィルタエレメントとして多孔質セラミックを使用するセラミックフィルタである。バグフィルタに較べてセラミックフィルタは耐熱性に優れるため、冷却塔９を必要としないこともある。排ガス中の焼却灰は集塵機１１のフィルタエレメントによりろ過されて分離され、下方に取り出される。しかし、ＳＯＸ、ＮＯＸなどのガス成分は集塵機１１を通過し、排煙処理塔１２で除去される。 The dust collector 11 is a bug filter that uses a filter cloth as a filter element, or a ceramic filter that uses a porous ceramic as a filter element. Since the ceramic filter has better heat resistance than the bag filter, the cooling tower 9 may not be required. The incinerator ash in the exhaust gas is filtered by the filter element of the dust collector 11 to be separated and taken out downward. However, gas components such as SO X and NO X pass through the dust collector 11 and are removed by the smoke exhaust processing tower 12.

排煙処理塔１２は、廃棄物焼却炉１からの排ガスを処理する設備である。排煙処理塔１２は塔上部から噴霧される洗煙水と排ガスとを接触させ、ＳＯＸ、ＮＯＸなどを洗煙水に吸収させて除去する。このように排ガスは洗煙水と接触するため、排煙処理塔１２を通過した排ガスは水蒸気が飽和状態となっている。 The flue gas treatment tower 12 is a facility for treating exhaust gas from the waste incinerator 1. The smoke exhaust treatment tower 12 brings the smoke wash water sprayed from the upper part of the tower into contact with the exhaust gas, and absorbs SO X , NO X , and the like into the smoke wash water to remove them. Since the exhaust gas comes into contact with the flue gas wash water in this way, the exhaust gas that has passed through the flue gas treatment tower 12 is saturated with water vapor.

排煙処理塔１２の後段には水銀吸着塔１３と、これに並列なバイパスライン１４とが設置されている。水銀吸着塔１３には吸着剤が充填されており、排ガス中の水銀を吸着する。しかし前記したように水銀吸着塔１３に供給される排ガスは水蒸気が飽和状態にあり、結露を生じるおそれがある。そこで本発明ではダクト８を分岐させて高温空気の一部を水銀吸着塔１３に送って加熱し、結露の発生を防止している。 A mercury adsorption tower 13 and a bypass line 14 parallel to the mercury adsorption tower 13 are installed after the smoke exhaust treatment tower 12. The mercury adsorption tower 13 is filled with an adsorbent and adsorbs mercury in the exhaust gas. However, as described above, the exhaust gas supplied to the mercury adsorption tower 13 is saturated with water vapor and may cause dew condensation. Therefore, in the present invention, the duct 8 is branched and a part of the high temperature air is sent to the mercury adsorption tower 13 to heat the duct 8 to prevent the occurrence of dew condensation.

本発明では、排煙処理塔１２よりも後段で排ガス中の水銀濃度を測定する。この実施形態では煙突１７に水銀濃度計１８が設置されており、大気中に放出される最終段階における排ガス中の水銀濃度を測定している。測定された水銀濃度が設定値を超えたときに、制御装置２０がバイパスライン１４のバルブ１５を閉じ、水銀吸着塔１３のバルブ１６を開いて水銀吸着塔１３に排ガスを供給し、水銀を吸着除去する。しかし測定された水銀濃度が設定値よりも低い時には、排ガスは水銀吸着塔１３に供給されず、バイパスライン１４を通過して誘引ファン１９により煙突１７に送られ大気中に排出される。 In the present invention, the mercury concentration in the exhaust gas is measured after the flue gas treatment tower 12. In this embodiment, a mercury densitometer 18 is installed in the chimney 17 to measure the mercury concentration in the exhaust gas at the final stage of being released into the atmosphere. When the measured mercury concentration exceeds the set value, the control device 20 closes the valve 15 of the bypass line 14, opens the valve 16 of the mercury adsorption tower 13, supplies exhaust gas to the mercury adsorption tower 13, and adsorbs mercury. Remove. However, when the measured mercury concentration is lower than the set value, the exhaust gas is not supplied to the mercury adsorption tower 13, passes through the bypass line 14, is sent to the chimney 17 by the attraction fan 19, and is discharged into the atmosphere.

このように、本発明では排ガスを水銀吸着塔１３に供給するときにのみ制御装置２０が高温空気の一部を水銀吸着塔１３に送って吸着剤の結露を防止するが、その他の通常運転時にはダクト８を流れる高温空気（白煙防止空気）の全てを煙突１７に供給し、白煙を防止する。このため水銀吸着塔１３を加熱するために別の熱源は不要であり、しかも白煙防止効果が損なわれることもない。 As described above, in the present invention, the control device 20 sends a part of the high temperature air to the mercury adsorption tower 13 only when the exhaust gas is supplied to the mercury adsorption tower 13 to prevent dew condensation of the adsorbent, but during other normal operation, All of the high-temperature air (white smoke prevention air) flowing through the duct 8 is supplied to the chimney 17 to prevent white smoke. Therefore, another heat source is not required to heat the mercury adsorption tower 13, and the white smoke prevention effect is not impaired.

なお、水銀濃度計１８により測定された排ガス中の水銀濃度が上昇し始めたときに、制御装置２０は誘引ファン１９の出力を所定値まで徐々に高めておくものとする。このように水銀吸着塔１３に排ガスを供給するに先立ち、誘引ファン１９の誘引力を通常運転時より強くしておけば、排ガスをバイパスライン１４から水銀吸着塔１３に切り替えたときの、水銀吸着塔１３の圧損の影響をなくし、廃棄物焼却炉１の急激な圧力変動を緩和することができる利点がある。 When the mercury concentration in the exhaust gas measured by the mercury densitometer 18 starts to increase, the control device 20 shall gradually increase the output of the attract fan 19 to a predetermined value . In this way, if the attractive force of the attracting fan 19 is made stronger than during normal operation prior to supplying the exhaust gas to the mercury adsorption tower 13, mercury adsorption when the exhaust gas is switched from the bypass line 14 to the mercury adsorption tower 13. There is an advantage that the influence of the pressure loss of the tower 13 can be eliminated and the sudden pressure fluctuation of the waste incinerator 1 can be mitigated.

以上に説明した第１の実施形態では、バイパスライン１４の出口は排ガスを煙突１７に誘引する誘引ファン１９の入口側に接続されている。しかし図２に示す第２の実施形態では、水銀吸着塔１３及びバイパスライン１４を誘引ファン１９の出口側に接続した。これにより、ブロワの容量と消費電力を低減することができる。また、誘引ファン１９の出口側では誘引ファンの断熱圧縮効果により排ガス温度が入り口側より上昇するので、その温度上昇分だけ高温空気の使用を減らすことができ、高温空気の更なる有効活用ができる。 In the first embodiment described above, the outlet of the bypass line 14 is connected to the inlet side of the attraction fan 19 that attracts the exhaust gas to the chimney 17. However, in the second embodiment shown in FIG. 2, the mercury adsorption tower 13 and the bypass line 14 are connected to the outlet side of the attraction fan 19. As a result, the capacity and power consumption of the blower can be reduced. Further, since the exhaust gas temperature rises from the inlet side on the outlet side of the attract fan 19 due to the adiabatic compression effect of the attract fan, the use of high temperature air can be reduced by the temperature rise, and the high temperature air can be further effectively utilized. ..

以上に説明したように、本発明によれば、排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔１２の後段に水銀吸着塔１３を配置した場合にも結露の発生がなくなり、結露水による水銀の吸着阻害を生ずることなく、排ガス中の水銀を効率よく吸着除去することができる。 As described above, according to the present invention, the mercury adsorption tower 13 is provided after the smoke exhaust treatment tower 12 in which the exhaust gas is brought into contact with the smoke wash water to absorb SOX and NOX in the smoke wash water and removed. Even when it is arranged, the generation of dew condensation is eliminated, and the mercury in the exhaust gas can be efficiently adsorbed and removed without causing the adsorption inhibition of mercury by the dew condensation water.

１ 廃棄物焼却炉
２ 汚泥ポンプ
３ 散気手段
４ 流動空気予熱器
５ 流動空気ブロワ
６ 白煙防止器
７ 白煙防止ファン
８ ダクト
９ 冷却塔
１０ ノズル
１１ 集塵機
１２ 排煙処理塔
１３ 水銀吸着塔
１４ バイパスライン
１５ バルブ
１６ バルブ
１７ 煙突
１８ 水銀濃度計
１９ 誘引ファン
２０ 制御装置 1 Waste incinerator 2 Sewage pump 3 Air diffuser 4 Flowing air preheater 5 Flowing air blower 6 White smoke preventer 7 White smoke prevention fan 8 Duct 9 Cooling tower 10 Nozzle 11 Dust collector 12 Smoke exhaust treatment tower 13 Mercury adsorption tower 14 Bypass line 15 Valve 16 Valve 17 Chimney 18 Mercury densitometer 19 Attraction fan 20 Control device

Claims (6)

廃棄物焼却炉からの排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔の後段に水銀吸着塔を配置して、排ガスに含まれる水銀を除去する排ガスからの水銀除去方法であって、
排煙処理塔よりも後段で排ガス中の水銀濃度を測定し、水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ、水銀吸着塔に排ガスを供給し、かつ、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておくことを特徴とする排ガスからの水銀除去方法。 A mercury adsorption tower is placed after the flue gas treatment tower that makes the exhaust gas from the waste incinerator come into contact with the flue gas and absorbs SOX and NOX in the flue gas to remove it. It is a method of removing mercury from exhaust gas.
The mercury concentration in the exhaust gas is measured after the smoke exhaust treatment tower, and when the mercury concentration exceeds the set value, the exhaust gas is supplied to the exhaust gas while heating the mercury adsorption tower with high temperature air, and A method for removing mercury from exhaust gas, which is characterized in that the attractive force of an attracting fan that attracts the exhaust gas treated by the mercury adsorption tower to the chimney is stronger than that during normal operation before supplying the exhaust gas to the mercury adsorption tower . 水銀吸着塔と並列にバイパスラインを設け、排ガス中の水銀濃度が設定値よりも低いときには、このバイパスラインを通じて排ガスを煙突に送ることを特徴とする請求項１に記載の排ガスからの水銀除去方法。 The method for removing mercury from exhaust gas according to claim 1, wherein a bypass line is provided in parallel with the mercury adsorption tower, and when the mercury concentration in the exhaust gas is lower than the set value, the exhaust gas is sent to the chimney through this bypass line. .. 前記水銀吸着塔及び前記バイパスラインを、排ガスを煙突に誘引する誘引ファンの出口側に接続し、結露の発生を防止することを特徴とする請求項２に記載の排ガスからの水銀除去方法。 The method for removing mercury from exhaust gas according to claim 2, wherein the mercury adsorption tower and the bypass line are connected to the outlet side of an attraction fan that attracts exhaust gas to a chimney to prevent the generation of dew condensation . 排ガス中の水銀濃度の測定を、煙突で行うことを特徴とする請求項１に記載の排ガスからの水銀除去方法。 The method for removing mercury from exhaust gas according to claim 1, wherein the mercury concentration in the exhaust gas is measured by a chimney . 前記高温空気として、白煙防止空気を用いることを特徴とする請求項１に記載の排ガスからの水銀除去方法。 The method for removing mercury from exhaust gas according to claim 1, wherein white smoke prevention air is used as the high-temperature air . 廃棄物焼却炉と、廃棄物焼却炉からの排ガスを洗煙水と接触させてＳＯＸやＮＯＸを洗煙水に吸収させて除去する排煙処理塔とを含む廃棄物処理装置であって、
排煙処理塔の後段に配置された水銀吸着塔と、
排煙処理塔よりも後段に配置された水銀濃度計と、
排ガス中の水銀濃度が設定値を超えたときに、高温空気により水銀吸着塔を加熱しつつ、水銀吸着塔に排ガスを供給する制御装置とを備え、
この制御装置は、水銀吸着塔に排ガスを供給するに先立ち、水銀吸着塔で処理された排ガスを煙突に誘引する誘引ファンの誘引力を通常運転時より強くしておく機能を備えたものであることを特徴とする廃棄物処理装置。 It is a waste treatment device including a waste incinerator and a flue gas treatment tower that contacts the exhaust gas from the waste incinerator with the flue gas and absorbs SOX and NOX into the flue gas to remove them. ,
The mercury adsorption tower located behind the smoke exhaust treatment tower and
A mercury densitometer located after the flue gas treatment tower,
Equipped with a control device that supplies exhaust gas to the mercury adsorption tower while heating the mercury adsorption tower with high-temperature air when the mercury concentration in the exhaust gas exceeds the set value.
This control device has a function to make the attraction force of the attraction fan that attracts the exhaust gas treated by the mercury adsorption tower to the chimney stronger than that during normal operation before supplying the exhaust gas to the mercury adsorption tower. A waste treatment device characterized by that.
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