JPH0446168B2 - - Google Patents
Info
- Publication number
- JPH0446168B2 JPH0446168B2 JP62159795A JP15979587A JPH0446168B2 JP H0446168 B2 JPH0446168 B2 JP H0446168B2 JP 62159795 A JP62159795 A JP 62159795A JP 15979587 A JP15979587 A JP 15979587A JP H0446168 B2 JPH0446168 B2 JP H0446168B2
- Authority
- JP
- Japan
- Prior art keywords
- cleaning
- mercury
- cooling water
- exhaust gas
- dehumidified
- 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.)
- Expired - Lifetime
Links
- 238000004140 cleaning Methods 0.000 claims description 54
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 41
- 229910052753 mercury Inorganic materials 0.000 claims description 41
- 239000000498 cooling water Substances 0.000 claims description 36
- 238000001816 cooling Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 5
- 239000007800 oxidant agent Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 34
- 239000007788 liquid Substances 0.000 description 12
- 239000003595 mist Substances 0.000 description 10
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 9
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000007791 dehumidification Methods 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 230000001603 reducing effect Effects 0.000 description 5
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- RCTYPNKXASFOBE-UHFFFAOYSA-M chloromercury Chemical compound [Hg]Cl RCTYPNKXASFOBE-UHFFFAOYSA-M 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002731 mercury compounds Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、ごみ焼却炉等から排気される排ガス
中の水銀除去方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing mercury from exhaust gas exhausted from a garbage incinerator or the like.
［従来の技術］
ごみ焼却炉の排ガス中には、法規制の対象とな
る塩化水素（HCl）、亜硫酸ガス（SO2）等の有
害ガスが含まれているため、通常、排ガスは乾式
法、半乾式法、又は湿式法により処理されてい
る。しかしながら、前記排ガス中には前記有害ガ
スの他に水銀及びその化合物が含まれており、そ
の含有量が作業環境基準値（0.05mg／m3）を越え
る場合があるが、上記塩化水素や亜硫酸ガスの除
去方法では充分な水銀の除去が期待できない。こ
れは、次のような理由によるものと推定される。
即ち、排ガス中の水銀の大部分は水溶性水銀であ
るにも拘らず、水銀が従来の湿式洗浄工程で除去
できないのは、洗浄液自体に酸化が不充分な還元
性物質を吸収しており、これが洗浄液に吸収され
た水銀化合物を還元し、再揮散させるためであ
る。従つて、この際揮散を防ぐには洗浄液のもつ
還元性を酸化剤によつて打消す必要がある。[Conventional technology] The exhaust gas from garbage incinerators contains harmful gases such as hydrogen chloride (HCl) and sulfur dioxide gas (SO 2 ), which are subject to legal regulations. It is processed by semi-dry method or wet method. However, in addition to the harmful gases mentioned above, the exhaust gas also contains mercury and its compounds, and the content may exceed the working environment standard value (0.05 mg/m 3 ). Sufficient mercury removal cannot be expected using gas removal methods. This is presumed to be due to the following reasons.
In other words, although most of the mercury in exhaust gas is water-soluble mercury, the reason why mercury cannot be removed by conventional wet cleaning processes is because the cleaning solution itself absorbs reducing substances that are not sufficiently oxidized. This is to reduce and revolatilize the mercury compounds absorbed in the cleaning solution. Therefore, in order to prevent volatilization at this time, it is necessary to counteract the reducing property of the cleaning liquid with an oxidizing agent.
このようなことから、次亜塩素酸塩（例えば次
亜塩素酸ソーダ）等の酸化剤を含む洗浄液に排ガ
スを接触させて該排ガス中の水銀を除去する湿式
洗煙法が開発されている。この湿式洗煙法は次の
ような原理によるものである。まず、次亜塩素酸
ソーダが下記(1)〜(3)式に示すように酸化性を有す
る酸素をつくり出し、排ガス中から洗浄液中へ溶
解して来る還元物質を酸化する。それゆえ、排ガ
ス中に存在するHgCl2はそのまま洗浄液中に溶解
するか、下記(4)のような状態で溶解し還元物質に
よつてHgまで還元されることなく安定化される。 For this reason, a wet smoke cleaning method has been developed in which mercury in the exhaust gas is removed by bringing the exhaust gas into contact with a cleaning solution containing an oxidizing agent such as hypochlorite (for example, sodium hypochlorite). This wet smoke cleaning method is based on the following principle. First, sodium hypochlorite creates oxidizing oxygen as shown in formulas (1) to (3) below, and oxidizes the reducing substances dissolved in the cleaning liquid from the exhaust gas. Therefore, HgCl 2 present in the exhaust gas is dissolved in the cleaning liquid as it is, or dissolved in the state shown in (4) below, and is stabilized without being reduced to Hg by the reducing substance.
NaClO→NaCl＋Ｏ ……(1)
NaClO＋HCl→NaCl＋HClO ……(2)
HClO→HCl＋Ｏ ……(3)
HgCl2＋2NaCl→Na2HgCl4 ……(4)
第２図は、本発明者等が先に出願した「排ガス
中の水銀除去方法」に係る湿式洗煙装置の一形態
を示す概略図である。ここで、第２図は、単一の
洗浄塔からなる湿式洗煙装置の一形態を示す概略
図である。 NaClO→NaCl+O ……(1) NaClO+HCl→NaCl+HClO ……(2) HClO→HCl+O ……(3) HgCl 2 +2NaCl→Na 2 HgCl 4 ……(4) Figure 2 is the first application filed by the present inventors. 1 is a schematic diagram showing one form of a wet smoke cleaning device according to the "method for removing mercury in exhaust gas". Here, FIG. 2 is a schematic diagram showing one form of a wet smoke scrubbing device consisting of a single scrubbing tower.
図中の１は洗浄塔である。この洗浄塔１の底部
には、次亜塩素酸塩（例えばNaClO）を含むカ
性ソーダ水溶液からなる洗浄液２が収容されてい
る。前記洗浄塔１の下部付近には、排ガスが供給
される急冷部３が設けられており、該急冷部３内
には前記洗浄液を噴霧するための第１のノズル４
が配置されている。前記洗浄塔１とノズル４を連
結する配管には、次亜塩素酸塩（例えばNaClO）
が供給される。前記洗浄塔１の中間付近には、前
記洗浄液を噴霧するための第２のノズル５を有す
る気液接触洗浄部６が配置されており、かつ前記
洗浄塔１と第２のノズル５を連結する配管には次
亜塩素酸塩（例えばNaClO）が供給される。前
記洗浄部６上方の洗浄塔１内には、第１のミスト
セパレータ７が配置されている。このミストセパ
レータ７上方の洗浄塔１内には、冷却水を噴霧す
るための第３のノズル８を有する減湿冷却部９が
配置されている。この減湿冷却部９の処理済冷却
水は冷却水貯槽１０に導入され、更に冷却塔１１
に供給される。この冷却塔１１の冷却水は、前記
第３のノズル８に供給される。なお、図中の１２
は前記減湿冷却部９上方の洗浄塔１内に配置され
た第２のミストセパレータである。 1 in the figure is a cleaning tower. At the bottom of the cleaning tower 1, a cleaning liquid 2 consisting of an aqueous caustic soda solution containing hypochlorite (for example, NaClO) is stored. A quenching section 3 to which exhaust gas is supplied is provided near the bottom of the cleaning tower 1, and a first nozzle 4 for spraying the cleaning liquid is provided in the quenching section 3.
is located. The piping connecting the cleaning tower 1 and the nozzle 4 contains hypochlorite (for example, NaClO).
is supplied. A gas-liquid contact cleaning section 6 having a second nozzle 5 for spraying the cleaning liquid is arranged near the middle of the cleaning tower 1, and connects the cleaning tower 1 and the second nozzle 5. The piping is supplied with hypochlorite (eg NaClO). A first mist separator 7 is arranged in the cleaning tower 1 above the cleaning section 6. A dehumidifying cooling section 9 having a third nozzle 8 for spraying cooling water is arranged in the cleaning tower 1 above the mist separator 7. The treated cooling water from the dehumidifying cooling section 9 is introduced into a cooling water storage tank 10, and further into a cooling tower 11.
supplied to The cooling water of this cooling tower 11 is supplied to the third nozzle 8. In addition, 12 in the figure
is a second mist separator arranged in the cleaning tower 1 above the dehumidification cooling section 9.
次に、上述した湿式洗煙装置を用いて水銀除去
方法を説明すると、まず、水銀含有排ガスを急冷
部３に供給し、この急冷部３で第１のノズル４か
らNaClOが添加された洗浄液を噴霧することに
より排ガスを冷却した後、洗浄塔１内に供給す
る。洗浄塔１内の冷却された排ガスは洗浄部６に
導入され、ここで第２のノズル５からNaClOが
添加された洗浄液を噴霧することにより前述した
反応が進行して排ガス中の水銀が洗浄液中に安定
化される。洗浄部６で処理されたガスは、第１の
ミストセパレータ７でミストが除去され、更に減
湿冷却部９に移行される。この減湿冷却部９で
は、第３のノズル８から冷却水が噴霧され、処理
ガスの冷却がなされる。冷却された処理ガスは、
第２のミストセパレータ１２でミスト除去が行わ
れた後、洗浄塔１上部から排出される。 Next, to explain the mercury removal method using the above-mentioned wet smoke cleaning device, first, mercury-containing exhaust gas is supplied to the quenching section 3, and in this quenching section 3, the cleaning liquid to which NaClO is added is supplied from the first nozzle 4. After the exhaust gas is cooled by spraying, it is supplied into the cleaning tower 1. The cooled exhaust gas in the cleaning tower 1 is introduced into the cleaning section 6, where the cleaning liquid to which NaClO is added is sprayed from the second nozzle 5, so that the above-mentioned reaction progresses and the mercury in the exhaust gas is removed from the cleaning liquid. stabilized at The gas processed in the cleaning section 6 has its mist removed by a first mist separator 7, and is further transferred to the dehumidification cooling section 9. In this dehumidification cooling section 9, cooling water is sprayed from the third nozzle 8 to cool the processing gas. The cooled processing gas is
After the mist is removed by the second mist separator 12, it is discharged from the upper part of the cleaning tower 1.
［発明が解決しようとする問題点］
しかしながら、第２図の装置を用いた水銀除去
方法によれば、減湿冷却部９に入る排ガスは第１
のミストセパレータ７により一部のミストを除去
されるが、水銀を含んだ残りのミストは同伴され
る。また、排ガス中には除去しきれない水銀が残
存するから、排ガスと接触する減湿冷却水は水銀
を取込む。更に、冷却塔１１が空気による直接冷
却の場合、減湿冷却水中の水銀が大気中に揮散し
て環境を汚染する危険がある。[Problems to be Solved by the Invention] However, according to the mercury removal method using the apparatus shown in FIG.
A part of the mist is removed by the mist separator 7, but the remaining mist containing mercury is entrained. Furthermore, since mercury that cannot be removed remains in the exhaust gas, the dehumidified cooling water that comes into contact with the exhaust gas takes in mercury. Furthermore, if the cooling tower 11 is directly cooled by air, there is a risk that mercury in the dehumidified cooling water will volatilize into the atmosphere and pollute the environment.
本発明は上記事情に鑑みてなされたもので、洗
浄塔からの減湿冷却水が冷却塔に入る前に減湿冷
却水中の水銀を除去し、冷却塔での空気中への水
銀の移行を防止し得る大気環境の良い排ガス中の
水銀除去方法を提供しようとするものである。 The present invention has been made in view of the above circumstances, and it removes mercury from the dehumidified cooling water from the cleaning tower before it enters the cooling tower, thereby preventing the transfer of mercury into the air in the cooling tower. The purpose is to provide a method for removing mercury from exhaust gas with a good atmospheric environment.
［問題点を解決するための手段］
本発明は、湿式洗煙による酸化剤を含む洗浄液
を収容した洗浄部と冷却水を噴霧するためのノズ
ルを有する減湿冷却部を有する洗浄装置を用いて
水銀含有排ガス中の水銀を除去する方法におい
て、前記排ガスを前記洗浄装置内に送り洗浄、減
湿冷却する工程と、減湿冷却水を装置外へ取出し
て該減湿冷却水中に還元剤を添加し曝気して残存
する水銀を除去した後冷却する工程と、再度前記
減湿冷却水を洗浄塔へ戻し減湿冷却水として使用
する工程とを具備することを要旨とする。[Means for Solving the Problems] The present invention uses a cleaning device having a cleaning section containing a cleaning liquid containing an oxidizing agent by wet smoke cleaning, and a dehumidification cooling section having a nozzle for spraying cooling water. In a method for removing mercury from mercury-containing exhaust gas, the exhaust gas is sent into the cleaning device to be cleaned, dehumidified and cooled, and the dehumidified cooling water is taken out of the device and a reducing agent is added to the dehumidified cooling water. The gist of the method is to include a step of aeration to remove residual mercury and then cooling, and a step of returning the dehumidified cooling water to the washing tower and using it as dehumidified cooling water.
ここで、減湿冷却水中に残存する水銀を除去す
る工程は、減湿冷却水に還元剤を添加し、曝気す
ることにより減湿冷却水中の水銀を除去する方法
をとる。 Here, the step of removing mercury remaining in the dehumidified cooling water involves adding a reducing agent to the dehumidified cooling water and removing mercury from the dehumidified cooling water by aeration.
上記減湿冷却部の冷却水に添加される還元剤と
しては、チオ硫酸、亜硫酸ソーダ等を挙げること
ができる。また、還元剤にて還元する際の減湿冷
却水のPHは、７以上が好ましい。 Examples of the reducing agent added to the cooling water of the dehumidifying cooling section include thiosulfuric acid, sodium sulfite, and the like. Further, the pH of the dehumidified cooling water when reducing with a reducing agent is preferably 7 or more.
［作用］
本発明によれば、減湿冷却水が冷却塔に入る前
に還元反応槽を用いて減湿冷却水中の水銀を除去
して無害化し、冷却塔での空気中への水銀の移行
を防止するため、大気環境を良好に保つことがで
きる。[Function] According to the present invention, before the dehumidified cooling water enters the cooling tower, the mercury in the dehumidified cooling water is removed using a reduction reaction tank to make it harmless, and the mercury is transferred to the air in the cooling tower. In order to prevent this, it is possible to maintain a good atmospheric environment.
［実施例］
以下、本発明の一実施例について第１図を参照
して説明する。但し、第２図と同部材は同符号を
付して説明を省略する。[Example] Hereinafter, an example of the present invention will be described with reference to FIG. However, the same members as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted.
図中の２１は、冷却水貯槽１０と冷却塔１１間
に設けられた還元反応槽である。この還元反応槽
２１には、ヒドラジン等の還元剤が注入される。
前記反応槽２１の底部と洗浄塔１とは、洗浄塔１
を出た排ガスが供給する第１配管２２により連結
されている。また、前記還元反応槽２１と洗浄塔
１の急冷部３とは、第２配管２３により連結され
ている。 21 in the figure is a reduction reaction tank provided between the cooling water storage tank 10 and the cooling tower 11. A reducing agent such as hydrazine is injected into this reduction reaction tank 21 .
The bottom of the reaction tank 21 and the cleaning tower 1 are connected to each other.
They are connected by a first pipe 22 to which the exhaust gas exiting the pipe is supplied. Further, the reduction reaction tank 21 and the quenching section 3 of the cleaning tower 1 are connected by a second pipe 23.
こうした構造の装置を用いて、本発明ではまず
冷却塔１１に入る前の減湿冷却水に還元剤を注入
し、洗浄塔１を出た排ガスを第１配管２２から導
き、その減湿冷却水を曝気する。これにより、減
湿冷却水中の水銀を排ガス中に移行させ、その排
ガスを第２配管を通して洗浄塔入口より手前の適
当な煙道に戻す。なお、曝気排ガスは、主煙道を
流れる排ガス量の数％程度でよい。ちなみに、ヒ
ドラジンを用いてPH８に調製した減湿冷却水を曝
気した場合、減湿冷却水中の水銀の95％程度が除
去可能である。また、曝気の際、減湿冷却水中の
水銀を還元するのは、水銀の水中溶解度を低下さ
せ、水中より揮散し易くするためである。例え
ば、還元前物質HgCl2溶解度は０℃で3.6ｇ／100
水、100℃で61.3ｇ／100ｇ水、還元後物質Hg溶
解度は25℃で２×10-6／100ｇ水、100℃で６×
10-5ｇ／100ｇ水である。 Using a device with such a structure, in the present invention, a reducing agent is first injected into the dehumidified cooling water before entering the cooling tower 11, and the exhaust gas exiting the cleaning tower 1 is guided through the first pipe 22, and the dehumidified cooling water is Aerate. As a result, the mercury in the dehumidified cooling water is transferred to the exhaust gas, and the exhaust gas is returned through the second pipe to an appropriate flue before the cleaning tower entrance. Note that the aeration exhaust gas may be about several percent of the amount of exhaust gas flowing through the main flue. By the way, when dehumidified cooling water adjusted to pH 8 using hydrazine is aerated, about 95% of the mercury in the dehumidified cooling water can be removed. Furthermore, the reason for reducing mercury in the dehumidified cooling water during aeration is to reduce the solubility of mercury in water and make it more easily volatilized than in water. For example, the solubility of HgCl 2 before reduction is 3.6 g/100 at 0°C.
Water, 61.3g/100g water at 100℃, substance Hg solubility after reduction is 2×10 -6 /100g water, 6× at 100℃ at 25℃
10 -5 g/100g water.
本発明によれば、減湿冷却水が冷却塔１１に入
る前に還元反応槽２１を用いて減湿冷却水中の水
銀を除去して無害化し、冷却塔１１での空気中へ
の水銀の移行を防止するため、大気環境を良好に
保つことができる。 According to the present invention, before the dehumidified cooling water enters the cooling tower 11, the reduction reaction tank 21 is used to remove mercury from the dehumidified cooling water to make it harmless, and the mercury is transferred into the air in the cooling tower 11. In order to prevent this, it is possible to maintain a good atmospheric environment.
［発明の効果］
以上詳述した如く本発明によれば、洗浄塔から
の減湿冷却水が冷却塔に入る前に減湿冷却水中の
水銀を除去し、冷却塔での空気中への水銀の移行
を防止し得る大気環境の良い排ガス中の水銀除去
方法を提供できる。[Effects of the Invention] As detailed above, according to the present invention, mercury in the dehumidified cooling water from the cleaning tower is removed before the dehumidified cooling water enters the cooling tower, and mercury is removed from the air in the cooling tower. It is possible to provide a method for removing mercury from exhaust gas with a good atmospheric environment that can prevent the migration of mercury.
第１図は本発明の一実施例に係る湿式洗煙装置
の概略図、第２図は排ガス中の水銀除去方法に使
用される湿式洗煙装置の一形態を示す概略図であ
る。
１……洗浄塔、２……洗浄液、３……急冷部、
４，５，８……ノズル、６……洗浄部、９……減
湿冷却部、１１……冷却塔、２１……還元反応
槽。
FIG. 1 is a schematic diagram of a wet smoke cleaning device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing one form of a wet smoke cleaning device used in a method for removing mercury from exhaust gas. 1...Cleaning tower, 2...Cleaning liquid, 3...Quiet cooling section,
4, 5, 8... Nozzle, 6... Washing section, 9... Dehumidification cooling section, 11... Cooling tower, 21... Reduction reaction tank.
Claims (1)
た洗浄部と冷却水を噴霧するためのノズルを有す
る減湿冷却部を有する洗浄装置を用いて水銀含有
排ガス中の水銀を除去する方法において、前記排
ガスを前記洗浄装置内に送り洗浄、減湿冷却する
工程と、減湿冷却水を装置外へ取出して該減湿冷
却水中に還元剤を添加し曝気して残存する水銀を
除去した後冷却する工程と、再度前記減湿冷却水
を洗浄塔へ戻し減湿冷却水として使用する工程と
を具備することを特徴とする排ガス中の水銀除去
方法。1. In the method of removing mercury from mercury-containing exhaust gas using a cleaning device having a cleaning section containing a cleaning solution containing an oxidizing agent by wet smoke cleaning and a dehumidifying cooling section having a nozzle for spraying cooling water, The exhaust gas is sent into the cleaning device to be cleaned, dehumidified and cooled, and the dehumidified cooling water is taken out of the device, a reducing agent is added to the dehumidified cooling water, and the remaining mercury is removed by aeration, followed by cooling. A method for removing mercury from exhaust gas, comprising the steps of: and returning the dehumidified cooling water to a cleaning tower and using it as dehumidified cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62159795A JPS647931A (en) | 1987-06-29 | 1987-06-29 | Method for removing mercury in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62159795A JPS647931A (en) | 1987-06-29 | 1987-06-29 | Method for removing mercury in exhaust gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS647931A JPS647931A (en) | 1989-01-11 |
| JPH0446168B2 true JPH0446168B2 (en) | 1992-07-29 |
Family
ID=15701431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62159795A Granted JPS647931A (en) | 1987-06-29 | 1987-06-29 | Method for removing mercury in exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS647931A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002102650A (en) * | 2000-09-27 | 2002-04-09 | Miyoshi Oil & Fat Co Ltd | Pretreatment method for flue gas |
| DE102012111185A1 (en) * | 2012-11-20 | 2014-05-22 | Thyssenkrupp Uhde Gmbh | Apparatus for gas scrubbing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60251918A (en) * | 1984-05-26 | 1985-12-12 | Seitetsu Kagaku Co Ltd | Removal of mercury in gaseous phase |
| JPS6257631A (en) * | 1985-09-04 | 1987-03-13 | Hitachi Zosen Corp | Method for reducing entrainment of mercury from circulating liquid cooling tower for dehumidifying waste gas |
-
1987
- 1987-06-29 JP JP62159795A patent/JPS647931A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60251918A (en) * | 1984-05-26 | 1985-12-12 | Seitetsu Kagaku Co Ltd | Removal of mercury in gaseous phase |
| JPS6257631A (en) * | 1985-09-04 | 1987-03-13 | Hitachi Zosen Corp | Method for reducing entrainment of mercury from circulating liquid cooling tower for dehumidifying waste gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS647931A (en) | 1989-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5985223A (en) | Removal of NOx and SOx emissions form pickling lines for metal treatment | |
| US6294139B1 (en) | Methods for wet cleaning or purifying gases or fumes to remove gaseous pollutants | |
| US8663594B2 (en) | Exhaust gas treating method | |
| US5649985A (en) | Apparatus for removing harmful substances of exhaust gas discharged from semiconductor manufacturing process | |
| ES2337997T3 (en) | NOX LEVEL REDUCTION PROCESS IN RESIDUAL GAS CURRENTS BY SODIUM CHLORITE USE. | |
| JPS6151935B2 (en) | ||
| JP2002301335A (en) | Apparatus and method for desulfurization | |
| KR100405222B1 (en) | Equipment for purifying flue gas with different contents of acidic components and method of operation | |
| JPH0446168B2 (en) | ||
| JP2008110281A (en) | Waste gas treatment method and treatment device | |
| JPH0356123A (en) | Removal of mercury and nox in gas | |
| JPS6388023A (en) | Removal of mercury in exhaust gas | |
| JPS6388022A (en) | Removal of mercury in exhaust gas | |
| JPH05220345A (en) | Method for removing mercury in exhaust gas | |
| KR20100075289A (en) | Method for removing elemental mercury in the flue gas | |
| JP2006231105A (en) | Method for removing oxidizing gas | |
| JPH0551326B2 (en) | ||
| JPS6388024A (en) | Removal of mercury in exhaust gas | |
| JPH0362443B2 (en) | ||
| JPH054122B2 (en) | ||
| JP2899270B1 (en) | Dioxin removal method from exhaust gas | |
| JPH01199632A (en) | Method for removing nox in waste gas | |
| KR20020050991A (en) | Method for wet scrubbing of nitrogen oxides from flue gas | |
| AU1955600A (en) | Removal of toxic gases using ozonated water technology | |
| KR20030053331A (en) | Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas |