JPH02203922A - Wet waste gas denitration method - Google Patents
Wet waste gas denitration methodInfo
- Publication number
- JPH02203922A JPH02203922A JP1024370A JP2437089A JPH02203922A JP H02203922 A JPH02203922 A JP H02203922A JP 1024370 A JP1024370 A JP 1024370A JP 2437089 A JP2437089 A JP 2437089A JP H02203922 A JPH02203922 A JP H02203922A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- bromine
- caustic soda
- gas
- nox
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002912 waste gas Substances 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 47
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims abstract description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 27
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 20
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052794 bromium Inorganic materials 0.000 claims abstract description 17
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 7
- CRWJEUDFKNYSBX-UHFFFAOYSA-N sodium;hypobromite Chemical compound [Na+].Br[O-] CRWJEUDFKNYSBX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 238000010521 absorption reaction Methods 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 26
- 238000004140 cleaning Methods 0.000 claims description 6
- -1 ammonium ions Chemical class 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract description 11
- 239000000243 solution Substances 0.000 abstract description 10
- 238000005406 washing Methods 0.000 abstract description 7
- 239000000567 combustion gas Substances 0.000 abstract 1
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 230000010534 mechanism of action Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 1
- 229910017974 NH40H Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、各種ボイラ、各種加熱炉、さらにはごみ焼
き炉などから排出される燃焼排ガス中の窒素酸化物（Ｎ
Ｏｘ） 、とりわけ−酸化窒素（ＮＯ）を効果的に除去
し、もって環境の改善に資するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is aimed at reducing nitrogen oxides (N
It effectively removes nitrogen oxides (Ox), especially nitrogen oxides (NO), thereby contributing to the improvement of the environment.
従来技術およびその問題点
排ガス中のＮＯｘを除去する方法としては各種の方法が
あるが、大きくは乾式法と湿式法に分けられる。前者は
、大規模装置が数多く可動しており、工業的にも完成さ
れた技術と考えられる。それに対して、後者の湿式法は
、装置的にも簡単で安価であるため有望な方法であるに
も拘らず、有効なＮＯｘの除去か達成されず、実用に供
されている例は少ない。これは、ＮＯｘが非常に反応性
に乏しくて、苛性ソーダ水溶液などにもほとんど吸収さ
れないためである。Prior Art and its Problems There are various methods for removing NOx from exhaust gas, but they can be broadly divided into dry methods and wet methods. The former involves many large-scale devices in operation and is considered to be an industrially accomplished technology. On the other hand, although the latter wet method is a promising method because it is simple and inexpensive in terms of equipment, it has not been able to effectively remove NOx, and there are few examples of it being put to practical use. This is because NOx has extremely low reactivity and is hardly absorbed even in aqueous caustic soda solution.
それでも、ＮＯｘ濃度が高い場合には各種酸化剤を添加
した苛性ソーダ水溶液にＮＯｘを吸収させる方法がある
。しかし、最近多く見られる上記の如き各種燃焼排ガス
のように１００ ｐＩ）ｎｌ以下の低いＮｏｘｐ度の排
ガスの場合には、上記のような湿式法ではＮＯｘ除去効
果はほとんど浸られず、この意味において湿式脱硝法の
実用化は進んでいない。However, if the NOx concentration is high, there is a method of absorbing the NOx with a caustic soda aqueous solution to which various oxidizing agents have been added. However, in the case of exhaust gas with a low NOxp level of 100 pI)nl or less, such as the various combustion exhaust gases mentioned above, which are often seen recently, the wet method described above has almost no effect on NOx removal, and in this sense, The practical application of wet denitrification methods has not progressed.
この発明の目的は、上記のような低濃度のＮＯｘに対し
て有効なＮＯｘ除去が達成できる湿式排煙脱硝方法を提
供するにある。An object of the present invention is to provide a wet flue gas denitrification method that can effectively remove NOx at low concentrations as described above.
問題点の解決手段
この発明による排ガス中のＮＯｘ除去方法は、排ガスを
湿式処理するに当たり、処理すべき排ガス中に予め臭素
（Ｂｒ２）を添加しておき、その後アンモニウムイオン
（Ｎ１（４” ）を含む苛性ソーダ（ＮａＯＨ）水溶液
よりなる吸収液に、上記臭素含有排ガスを接触させるこ
とを特徴とする。Means for Solving Problems In the method for removing NOx from exhaust gas according to the present invention, when wet-processing exhaust gas, bromine (Br2) is added in advance to the exhaust gas to be treated, and then ammonium ions (N1 (4") are added to the exhaust gas to be treated). The bromine-containing exhaust gas is brought into contact with an absorption liquid comprising an aqueous solution of caustic soda (NaOH).
排ガス中に添加する臭素の形態としては、Ｂｒ２ガスが
好適である。Br2 gas is suitable as the form of bromine added to the exhaust gas.
また工業的には次の２つの臭素添加方法が効果的である
。In addition, the following two bromine addition methods are industrially effective.
１）ＮＯｘ吸収段の前流側に排ガス洗浄段を設け、その
洗浄液として、次亜臭素酸ソーダ（ＮａＢｒＯ）を溶解
しかつ鉱酸によってｐＨを強酸性に調整した液を用い、
この洗浄液に排ガスを接触させる。この操作によって、
発生する臭素ガスが排ガス中に添加されることになる。1) An exhaust gas cleaning stage is provided upstream of the NOx absorption stage, and the cleaning liquid is a solution in which sodium hypobromite (NaBrO) is dissolved and the pH is adjusted to be strongly acidic with mineral acid.
Exhaust gas is brought into contact with this cleaning liquid. With this operation,
The generated bromine gas will be added to the exhaust gas.
この反応は次式のとおりである。This reaction is as follows.
ＮａＢ ｒＯ＋２Ｈ” −＋
Ｎａ” ＋１／２ Ｂ ｒ２ ＋Ｈ’２０２）後述する
ように、ＮＯｘ吸収に対するＢｒ２の作用機構は触媒作
用と考えられ、排ガス中のＢｒ２は吸収液中に臭化ソー
ダ（ＮａＢｒ）として捕捉される。そのため、ＮＯｘ吸
収後の吸収液を隔膜電解で処理することによって、Ｂｒ
２ガスとＮａＯＨを得ることができる。そこで、Ｂ「２
ガスを再び排ガス中に添加し、ＮａＯＨを吸収液に添加
して、これらを循環使用することができる。この反応は
次式のとおりである。NaB rO+2H" -+ Na" +1/2 Br2 +H'202) As described later, the mechanism of action of Br2 on NOx absorption is thought to be catalytic, and Br2 in the exhaust gas is absorbed by sodium bromide (NaBr) in the absorption liquid. is captured as Therefore, by treating the absorption liquid after NOx absorption with diaphragm electrolysis, Br
2 gas and NaOH can be obtained. Therefore, B “2
The gas can be added back into the exhaust gas and the NaOH can be added to the absorption liquid and these can be recycled. This reaction is as follows.
２ＮａＢｒ＋２Ｈ２０−＋
Ｂ ｒ２ ＋ ２・Ｎ ａ ＯＨ＋Ｈ２この隔膜電
解は、隔膜としてアスベスト膜を用い、陽極にＤＳＡ
（ルテニウムコートのチタン電極）を、陰極に軟鋼をそ
れぞれ使用することによって実施される。2NaBr+2H20-+ B r2 + 2・Na OH+H2 This diaphragm electrolysis uses an asbestos membrane as the diaphragm and DSA as the anode.
(ruthenium-coated titanium electrode) and mild steel as the cathode.
本発明におけるＮＯｘの吸収液としては、ＮＨ４＋を含
むＮａＯＨ水溶液を使用する。吸収液としてＮＨ４＋を
含まない単なるＮａＯＨ水溶液を使用した場合には、効
果的なＮＯｘ除去率が得られない。As the NOx absorption liquid in the present invention, an aqueous NaOH solution containing NH4+ is used. If a simple NaOH aqueous solution containing no NH4+ is used as the absorption liquid, an effective NOx removal rate cannot be obtained.
吸収液としてＮＨ４＋を含むＮａＯＨ水溶液を使用した
場合においても、排ガス中に予めＢｒ２を添加しなけれ
ば、高いＮＯｘ除去率は得られない。すなわち、Ｂｒ２
と類似の性質を持つと思われる塩素ガス（ＣＩ２）を用
いても、Ｂｒ２を用いた場合に見られるような顕著な効
果は得られない。この高いＢｒ２作用効果の機構は解明
していないが、反応性に富む臭化ニトリル（ＮＯＢｒ）
を中間体として生成するものと思われる。Even when an aqueous NaOH solution containing NH4+ is used as the absorption liquid, a high NOx removal rate cannot be obtained unless Br2 is added to the exhaust gas in advance. That is, Br2
Even if chlorine gas (CI2), which is thought to have similar properties, is used, the remarkable effect seen when using Br2 cannot be obtained. Although the mechanism of this high Br2 action effect is not clear, the highly reactive nitrile bromide (NOBr)
It is thought that it is produced as an intermediate.
ＮＯ＋ｌ／２ Ｂ ｒ２ →Ｎｏ Ｂ ｒそして、この
ＮＯＢ ｒは反応性に富み、水溶液中にＮＨ４＋が存在
する場合に、同波に格別吸収され易い。このＮＨ４＋の
作用機構については、これが気・液境界層においてＮＨ
３分圧を有し、ＮＯＢ ｒを捕捉し易いためと考えられ
る。NO+l/2 B r2 →No Br This NOBr is highly reactive, and when NH4+ is present in the aqueous solution, it is particularly easily absorbed by the same wave. The mechanism of action of NH4+ is that it is NH4+ in the gas-liquid boundary layer.
This is thought to be because it has a partial pressure of 3 and can easily capture NOBr.
ＮＯＢ ｒ十ＮＨ４０Ｈ→
Ｎ Ｈ４Ｎ ０２ ＋ＨＢ ｒ
生成したＨＢｒは水溶液中のＮａＯＨによって中和され
る。NOB r +NH40H→ N H4N 02 +HB r The generated HBr is neutralized by NaOH in the aqueous solution.
ＨＢ ｒ ＋ Ｎ ａ ＯＨ−＋ Ｎ ａ Ｂ ｒ ＋
Ｈ２０ＮＨ４＋の供給源としては、ＮＨ３（ガス）、
ＮＨ４ＯＨ（水溶液）が使用できることは勿論であるが
、工業的にはアンモニウム塩たとえば硫酸アンモニウム
（（ＮＨ４）２ＳＯ４）、塩化アンモニウム（ＮＨ４０
Ｈ）などが、経済的にかつ反応面での問題なく使用でき
る。HB r + N a OH-+ N a B r +
As a supply source of H20NH4+, NH3 (gas),
Of course, NH4OH (aqueous solution) can be used, but ammonium salts such as ammonium sulfate ((NH4)2SO4) and ammonium chloride (NH40
H) etc. can be used economically and without problems in terms of reaction.
つぎに、本発明を実施する場合の重要な反応条件として
、排ガス中の臭素添加量、吸収液中のＮＨ４４含有量さ
らには吸収液のｐＨ（ＮａＯＨによって調整）を以下に
示す。Next, as important reaction conditions when implementing the present invention, the amount of bromine added in the exhaust gas, the NH44 content in the absorption liquid, and the pH of the absorption liquid (adjusted with NaOH) are shown below.
１）臭素添加量：Ｂｒ２／ＮＯモル比−１以上２）
ＮＨ４＋含有量： ＮＨ４” ／Ｎｏモル比−１以上
３）吸収液入口のｐＨ：３〜９
本発明の方法の実施に使用される洗浄塔および吸収塔の
装置形式としては、従来から知られているラシヒリング
充填塔、スプレー塔、棚段塔などが適宜使用可能である
。そして、これらの吸収塔の運転条件、すなわち、液ガ
ス比１．ガス空塔速度などは希望する脱硝率との関係に
おいて決定されるべきものである。1) Amount of bromine added: Br2/NO molar ratio -1 or more 2)
NH4+ content: NH4''/No molar ratio -1 or more 3) pH at absorption liquid inlet: 3 to 9 The equipment types of the washing tower and absorption tower used to carry out the method of the present invention include conventionally known equipment types. Raschig ring packed towers, spray towers, tray towers, etc. can be used as appropriate.The operating conditions of these absorption towers, i.e., liquid-gas ratio 1. Gas superficial velocity, etc., are determined in relation to the desired denitrification rate. It is to be determined.
発明の効果
本発明の湿式ＮＯｘ除去法によれば、吸収液による排ガ
ス処理の前に予め排ガスに臭素を添加しておくので、従
来の湿式吸収法ではほとんど除去不可能であった低濃度
のＮＯｘを、極めて効果的に除去することができる。Effects of the Invention According to the wet NOx removal method of the present invention, bromine is added to the exhaust gas in advance before exhaust gas treatment with an absorption liquid, so it is possible to remove NOx at low concentrations, which was almost impossible to remove with conventional wet absorption methods. can be removed very effectively.
実 施 例 次に本発明を実施例と比較例をもって説明する。Example Next, the present invention will be explained with reference to Examples and Comparative Examples.
実施例１
第１図に示すように、洗浄塔（１）および吸収塔（３）
を備えた実験装置を用いて、Ｎｏ除去実験を実施した。Example 1 As shown in FIG. 1, a washing tower (1) and an absorption tower (3)
A No removal experiment was carried out using an experimental apparatus equipped with the following.
同図において、洗浄塔（１）は直径３０肛×高さ５１０
ｍｍのものであって、温水ジャケット（２）を外装し、
内部には平均直径２■の球形ガラスピーズが高さ３３１
■まで充填されている。吸収塔（３）も洗浄塔（１）と
全く同じ形式および大きさを有し、温水ジャケット（４
）を外装している。洗浄塔（１）および吸収塔（３）の
内部温度は各温水ジャケソＩ−（２）（４）によって所
定温度（通常７［）’Ｃ）に維持されている。In the same figure, the cleaning tower (1) has a diameter of 30 mm and a height of 510 mm.
mm, and is equipped with a hot water jacket (2),
Inside, there are spherical glass beads with an average diameter of 2 cm and a height of 331 mm.
It is filled up to ■. The absorption tower (3) also has exactly the same type and size as the washing tower (1), and has a hot water jacket (4
). The internal temperature of the washing tower (1) and the absorption tower (3) is maintained at a predetermined temperature (usually 7 [)'C) by each hot water jacket I-(2) (4).
また、本図には試験用調製排ガスおよび処理ガスの各ガ
ス組成、ならびに液組成を分析するための分析系統も示
しである。This figure also shows an analysis system for analyzing the gas compositions of the prepared exhaust gas for testing and the processing gas, as well as the liquid composition.
本実験において採用した共通の標準的な条件を第１表に
示す。この実験では、臭素の添加は、洗浄塔（１）にＮ
ａＢｒ０水溶液を注入し、これを塩酸にてｐＨ１〜２に
調整することによって行なフた。Table 1 shows the common standard conditions adopted in this experiment. In this experiment, the addition of bromine was added to the washing tower (1) with N
This was done by injecting an aBr0 aqueous solution and adjusting the pH to 1 to 2 with hydrochloric acid.
洗浄塔出口の塩素はＯｐｐｍであった。The chlorine at the outlet of the washing tower was Oppm.
実施例２および比較例１
実施例１で示した第１図の実施装置において、ＮａＢｒ
０／ＮＯｘモル比を変化させて、他は実施例１と同じ条
件で、ＮＯｘ除去率を測定した。この結果を第２表に示
す。なお、吸収液のｐＨは９であった。同表から明らか
なように、Ｂｒ２の添加によってＮＯｘ除去率が大巾に
向上せられた。Example 2 and Comparative Example 1 In the implementation apparatus shown in FIG. 1 shown in Example 1, NaBr
The NOx removal rate was measured under the same conditions as in Example 1 except that the 0/NOx molar ratio was changed. The results are shown in Table 2. Note that the pH of the absorption liquid was 9. As is clear from the table, the NOx removal rate was greatly improved by adding Br2.
実施例３および比較例２
実施例１で示した第１図の実験装置において、ＮａＢｒ
０／ＮＯｘモル比を４とし、吸収液のｐＨを９とし、吸
収液中のＮＨ４＋濃度を変化させて、他は実施例１と同
じ条件で、ＮＯｘ除去率を測定した。その結果を第３表
に示す。同表から明らかなように、吸収液にＮＨ４＋を
含有させたことによって、ＮＯｘ除去率が大巾に向上せ
られた。Example 3 and Comparative Example 2 In the experimental apparatus shown in FIG. 1 shown in Example 1, NaBr
The NOx removal rate was measured under the same conditions as in Example 1 except that the 0/NOx molar ratio was 4, the pH of the absorption liquid was 9, and the NH4+ concentration in the absorption liquid was varied. The results are shown in Table 3. As is clear from the table, the NOx removal rate was greatly improved by containing NH4+ in the absorption liquid.
比較例４
実施例３の条件下、ＮａＢｒ０の代わりに同様の性質を
持つＮａＣ１０を用い、この場合のＮＯｘ除去率を測定
した。ＮＯｘ除去率は１６０％と著しく低かった。Comparative Example 4 Under the conditions of Example 3, NaClO having similar properties was used instead of NaBrO, and the NOx removal rate in this case was measured. The NOx removal rate was extremely low at 160%.
実施例５
第３図に示すように、冷却塔（５）および吸収塔（６）
を備えた実験装置を用いて、排ガスとして灯油焚きボイ
ラ排ガスを処理して、Ｎｏ除去実験を実施した。この装
置では冷却塔（５〉の上に吸収塔（６）が積み重ね状に
設置されている。Example 5 As shown in FIG. 3, a cooling tower (5) and an absorption tower (6)
A NO removal experiment was carried out by treating kerosene-fired boiler exhaust gas as exhaust gas using an experimental device equipped with the following. In this device, an absorption tower (6) is installed in a stacked manner on a cooling tower (5>).
この冷却塔（５）はスプレー基型のものであり、吸収塔
（６）は向流充填塔型のものである。The cooling tower (5) is of the spray base type, and the absorption tower (6) is of the countercurrent packed tower type.
この装置において、冷却塔（５）の底部から出た冷却液
は、ポンプ（７）を介して同浴（５）の頂部へ戻される
。また吸収塔（６〉の底部から出たＮＯｘ吸収後の吸収
液は、水ｔＯｆ （８）およびポンプ（９）を経て同浴
（６）の頂部へ戻される。Ｎ。In this device, the cooling liquid leaving the bottom of the cooling tower (5) is returned to the top of the bath (5) via a pump (7). Further, the absorption liquid after NOx absorption coming out from the bottom of the absorption tower (6>) is returned to the top of the same bath (6) via water tOf (8) and a pump (9).N.
Ｘ吸収後の吸収液の一部は、隔膜電解槽（ｌＯ）へ抜き
出され、ここで電解処理される。この隔膜電解では、隔
膜としてアスベスト膜を用い、陽極にＤＳＡ （ルテニ
ウムコートのチタン電極）を、陰極に軟鋼を使用する。A part of the absorption liquid after X absorption is extracted to the diaphragm electrolytic cell (lO), where it is electrolytically treated. In this diaphragm electrolysis, an asbestos membrane is used as the diaphragm, DSA (ruthenium-coated titanium electrode) is used as the anode, and mild steel is used as the cathode.
電解によって得られたＢｒ２ガスは、冷却塔（５）に供
給されて排ガスに添加される。また電解によって得られ
たＮａＯＨは、冷却塔（５）の底部液に加えられる。こ
うしてＢｒ２ガスおよびＮａＯＨは循環使用される。The Br2 gas obtained by electrolysis is supplied to the cooling tower (5) and added to the exhaust gas. NaOH obtained by electrolysis is also added to the bottom liquid of the cooling tower (5). In this way, Br2 gas and NaOH are recycled.
第１表 （以下余白） 第２表Table 1 (Margin below) Table 2
第１図および第３図は本発明の実施例を示すフローシー
ト、第２図はｐＨ濃度とＮｏ除去率の関係を示すグラフ
である。
以上1 and 3 are flow sheets showing examples of the present invention, and FIG. 2 is a graph showing the relationship between pH concentration and No removal rate. that's all
Claims (3)
吸収除去するに当たり、該排ガス中に予め臭素を添加し
ておき、その後アンモニウムイオンを含む苛性ソーダ水
溶液よりなる吸収液に、上記臭素含有排ガスを接触させ
ることを特徴とする、湿式排煙脱硝方法。(1) When nitrogen oxides in various combustion exhaust gases are absorbed and removed by an absorption liquid, bromine is added to the exhaust gas in advance, and then the bromine-containing exhaust gas is added to the absorption liquid made of a caustic soda aqueous solution containing ammonium ions. A wet flue gas denitrification method characterized by contact.
ーダ水溶液を強酸性に調整した液を洗浄液として用い、
この洗浄液に排ガスを接触させることを特徴とする請求
項（１）記載の方法。(2) In order to add bromine to the exhaust gas, a sodium hypobromite aqueous solution adjusted to be strongly acidic is used as a cleaning liquid,
The method according to claim 1, characterized in that the cleaning liquid is brought into contact with exhaust gas.
ーダ水溶液を隔膜電解し、得られた臭素ガスおよび苛性
ソーダを循環使用することを特徴とする請求項（１）記
載の方法。(3) The method according to claim (1), wherein the caustic soda aqueous solution after absorbing and removing nitrogen oxides in the exhaust gas is subjected to diaphragm electrolysis, and the obtained bromine gas and caustic soda are recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024370A JPH0691942B2 (en) | 1989-02-01 | 1989-02-01 | Wet flue gas denitration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024370A JPH0691942B2 (en) | 1989-02-01 | 1989-02-01 | Wet flue gas denitration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02203922A true JPH02203922A (en) | 1990-08-13 |
| JPH0691942B2 JPH0691942B2 (en) | 1994-11-16 |
Family
ID=12136306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1024370A Expired - Fee Related JPH0691942B2 (en) | 1989-02-01 | 1989-02-01 | Wet flue gas denitration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691942B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02229527A (en) * | 1989-03-02 | 1990-09-12 | Hitachi Zosen Corp | Method for simultaneously removing sulfur oxide and nitrogen oxide |
-
1989
- 1989-02-01 JP JP1024370A patent/JPH0691942B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02229527A (en) * | 1989-03-02 | 1990-09-12 | Hitachi Zosen Corp | Method for simultaneously removing sulfur oxide and nitrogen oxide |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0691942B2 (en) | 1994-11-16 |
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