JPH0757305B2 - Treatment method of exhaust gas containing hydrogen chloride - Google Patents
Treatment method of exhaust gas containing hydrogen chlorideInfo
- Publication number
- JPH0757305B2 JPH0757305B2 JP2409483A JP40948390A JPH0757305B2 JP H0757305 B2 JPH0757305 B2 JP H0757305B2 JP 2409483 A JP2409483 A JP 2409483A JP 40948390 A JP40948390 A JP 40948390A JP H0757305 B2 JPH0757305 B2 JP H0757305B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- hydrogen chloride
- slaked lime
- particle size
- containing hydrogen
- 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
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Treating Waste Gases (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、濾過集塵式排ガス処
理機を用いて塩化水素ガスその他を含む燃焼排ガスを処
理する方法に関し、さらに詳しくは、バグフィルタの逆
洗回数をできるだけ減らして塩化水素を高効率で除去す
ることができる方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating combustion exhaust gas containing hydrogen chloride gas and the like by using a filter dust collecting type exhaust gas treatment device, and more specifically, it reduces chlorine by backwashing the bag filter as much as possible. The present invention relates to a method capable of removing hydrogen with high efficiency.
【０００２】[0002]
【従来の技術】一般に、塩化水素含有排ガスのような酸
性排ガスの処理方法としては、湿式、半乾式および乾式
のアルカリ法が行われている。これらの方法の基本反応
は、排ガス中に消石灰のようなアルカリ性化合物を吹き
込んでこれで塩化水素のような酸性含有物を中和するも
ので、次式の如く進行する。2. Description of the Related Art Generally, wet, semi-dry and dry alkali methods are used as methods for treating acidic exhaust gas such as hydrogen chloride-containing exhaust gas. The basic reaction of these methods is to blow an alkaline compound such as slaked lime into exhaust gas to neutralize an acidic substance such as hydrogen chloride, and proceed as shown in the following formula.
【０００３】 Ｃａ（ＯＨ）２＋２ＨＣｌ → ＣａＣｌ２＋２Ｈ２Ｏ 消石灰を吹き込むだけでは上記反応の反応率が低いの
で、吹き込む部の後流にバグフィルタのような濾過集塵
式排ガス処理機を設置し、図２に示すように、未反応の
消石灰を含むダストをバグフィルタ(21)の前流面に堆積
させ、このダスト堆積層(22)に排ガスを通過させ、堆積
層中の消石灰と排ガス中の塩化水素との反応によって塩
化水素除去率を向上させている。The reaction rate of the above reaction is low only by blowing Ca (OH) 2 + 2HCl → CaCl 2 + 2H 2 O slaked lime. As shown in Fig. 2, dust containing unreacted slaked lime is deposited on the upstream surface of the bag filter (21), and exhaust gas is allowed to pass through this dust accumulation layer (22) to remove slaked lime and the exhaust gas in the accumulated layer. The hydrogen chloride removal rate is improved by the reaction with hydrogen chloride.
【０００４】上記のような方法ではダスト堆積層の層厚
が増すほど、反応率が向上するが、堆積層があまり厚く
なると、通気抵抗が大きくなり、後流における排気の吸
引が不可能になるので、通常は随時バグフィルタの逆洗
を行なって堆積層の通気抵抗を一定値以上に保持してい
る。In the above-mentioned method, the reaction rate increases as the layer thickness of the dust accumulation layer increases, but if the accumulation layer becomes too thick, the ventilation resistance increases and it becomes impossible to suck the exhaust gas in the wake. Therefore, the bag filter is usually backwashed at any time to maintain the ventilation resistance of the deposited layer at a certain value or more.
【０００５】[0005]
【発明がしようとする課題】しかし、バグフィルタの逆
洗を行なっている間は必然的に排ガス処理は休止せざる
をえず、頻繁な逆洗は排ガス処理効率の低下を招いてい
る。However, the exhaust gas treatment is inevitably stopped while the bag filter is backwashed, and frequent backwashing causes a reduction in exhaust gas treatment efficiency.
【０００６】この発明の目的は、上記の点に鑑み、バグ
フィルタの逆洗回数をできるだけ減らして塩化水素を高
効率で除去することができる方法を提供するにある。In view of the above points, an object of the present invention is to provide a method capable of removing hydrogen chloride with high efficiency by reducing the number of backwashing of a bag filter as much as possible.
【０００７】[0007]
【課題を解決するための手段】この発明は上記目的を達
成すべく工夫されたもので、消石灰と粒径不均一な炭酸
カルシウムとの混合物を用いると、ダスト堆積層が厚く
なっても、通気抵抗がそれほど大きくならず、そのため
逆洗の回数を減らすことができるという知見を得て完成
されたものである。The present invention has been devised in order to achieve the above-mentioned object. When a mixture of slaked lime and calcium carbonate having a nonuniform particle size is used, even if the dust accumulation layer becomes thick, aeration can be achieved. It was completed with the knowledge that the resistance does not increase so much and therefore the number of backwashing can be reduced.
【０００８】すなわち、この発明による塩化水素含有排
ガスの処理方法は、濾過集塵式排ガス処理機を用いた排
ガス処理において、中和剤としての消石灰に粒径不均一
な炭酸カルシウムを混合して得られた混合物を該処理機
の前流で排ガス中に吹き込むことを特徴とするものであ
る。That is, the method for treating exhaust gas containing hydrogen chloride according to the present invention is obtained by mixing slaked lime as a neutralizing agent with calcium carbonate having a non-uniform particle size in exhaust gas treatment using a filter dust collecting type exhaust gas treatment machine. It is characterized in that the obtained mixture is blown into the exhaust gas in the upstream of the processing machine.
【０００９】中和用の消石灰の粒径は通常５μ程度であ
る。粒径不均一な炭酸カルシウムは５μ以上の不均一な
粒径を有する粒子より成るものである。The particle size of slaked lime for neutralization is usually about 5 μm. Calcium carbonate having a nonuniform particle size is composed of particles having a nonuniform particle size of 5 μm or more.
【００１０】[0010]
【作用】この発明の塩化水素含有排ガスの処理方法によ
れば、濾過集塵式排ガス処理機を用いた排ガス処理にお
いて、中和剤としての消石灰に粒径不均一な炭酸カルシ
ウムを混合して得られた混合物を該処理機の前流で排ガ
ス中に吹き込むので、未反応の消石灰粒子と粒径不均一
な炭酸カルシウム粒子を含むダストを濾過集塵式排ガス
処理機のフィルタ前流面に堆積させ、このダスト堆積層
に排ガスを通過させ、堆積層中の消石灰と排ガス中の塩
化水素を反応させることによって、消石灰と排ガス中の
塩化水素の接触面積が大きく、その結果高い反応率が得
られる。したがって、ダスト堆積層が厚くなっても、通
気抵抗がそれほど大きくならず、逆洗の回数を減らすこ
とができる。According to the method for treating exhaust gas containing hydrogen chloride of the present invention, in the exhaust gas treatment using the filter dust collecting type exhaust gas treatment machine, slaked lime as a neutralizing agent is obtained by mixing calcium carbonate having a nonuniform particle size. Since the resulting mixture is blown into the exhaust gas in the upstream of the processor, dust containing unreacted slaked lime particles and calcium carbonate particles of non-uniform particle size is deposited on the filter upstream surface of the filter dust collecting type exhaust gas processor. By passing exhaust gas through the dust deposit layer and reacting slaked lime in the deposit layer with hydrogen chloride in the exhaust gas, the contact area between slaked lime and hydrogen chloride in the exhaust gas is large, and as a result, a high reaction rate is obtained. Therefore, even if the dust accumulation layer is thick, the ventilation resistance is not so large, and the number of backwashing can be reduced.
【００１１】[0011]
【実施例】つぎに、この発明を具体的に説明するため
に、この発明の実施例を示す。EXAMPLES Examples of the present invention will be shown below to specifically explain the present invention.
【００１２】粒径５μの中和用消石灰粒子(3) に不均一
な粒径８〜１２μの炭酸カルシウム粒子(4) を混合し、
得られた混合物を排ガス中に吹き込んだ。吹き込む部の
後流に設置されたバグフィルタによって、図１に示すよ
うに、未反応の消石灰粒子(3) と不均一な粒径８〜１２
μの炭酸カルシウム粒子(4) を含むダストをバグフィル
タ(1) の前流面に堆積させた。こうして形成されたダス
ト堆積層(2) に排ガスを通過させ、堆積層中の消石灰と
排ガス中の塩化水素を反応させた。このダスト堆積層
(2) では、堆積層中の炭酸カルシウム粒子(4) の粒径が
不均一であるため消石灰と排ガス中の塩化水素の接触面
積が大きく、その結果高い反応率が得られた。Neutralizing slaked lime particles (3) having a particle size of 5 μ are mixed with calcium carbonate particles (4) having an uneven particle size of 8 to 12 μ,
The resulting mixture was blown into the exhaust gas. As shown in FIG. 1, due to the bag filter installed downstream of the blowing section, unreacted slaked lime particles (3) and a non-uniform particle size of 8-12
Dust containing μ calcium carbonate particles (4) was deposited on the upstream surface of the bag filter (1). Exhaust gas was passed through the thus-formed dust deposition layer (2) to react slaked lime in the deposition layer with hydrogen chloride in the exhaust gas. This dust layer
In (2), the contact area between slaked lime and hydrogen chloride in the exhaust gas was large because the particle size of the calcium carbonate particles (4) in the sedimentary layer was non-uniform, resulting in a high reaction rate.
【００１３】図３は、堆積層(2) の層厚(z) と通気抵抗
（ΔＰ）との関係を示すもので、当量比一定で同じ通気
抵抗（ΔＰ）のとき、堆積層(2) がどの程度増すかを見
たものである。同図から、この発明の方法では従来の方
法に比べ、上記条件で堆積層(2) が増大し、その結果消
石灰と排ガス中の塩化水素の接触面積が大きく、反応率
が向上したことがわかる。FIG. 3 shows the relationship between the layer thickness (z) of the deposited layer (2) and the ventilation resistance (ΔP). When the equivalent ratio is constant and the ventilation resistance (ΔP) is the same, the deposited layer (2) is shown. Is to see how much increases. From the figure, it can be seen that in the method of the present invention, the deposition layer (2) was increased under the above conditions as compared with the conventional method, and as a result, the contact area between slaked lime and hydrogen chloride in the exhaust gas was large and the reaction rate was improved. .
【００１４】図４は、当量比とＨＣｌ除去率の関係を示
すものである。同図から、従来の方法ではＨＣｌ除去率
は当量比３以上で９５％の横這いになっていたが、この
発明の方法による反応率の向上により、２．５以上の当
量比で従来法とほぼ同等のＨＣｌ除去率９５％が得られ
ることがわかる。FIG. 4 shows the relationship between the equivalence ratio and the HCl removal rate. From the same figure, the HCl removal rate in the conventional method leveled off at 95% at the equivalence ratio of 3 or more, but due to the improvement of the reaction rate by the method of the present invention, it was almost the same as the conventional method at the equivalence ratio of 2.5 or more. It can be seen that an equivalent HCl removal rate of 95% is obtained.
【００１５】かくして実施例の方法では、ダスト堆積層
が厚くなっても、通気抵抗がそれほど大きくならず、そ
のため逆洗の回数を減らすことができる。Thus, in the method of the embodiment, even if the dust accumulation layer becomes thick, the ventilation resistance does not become so large, and therefore the number of backwashing can be reduced.
【００１６】[0016]
【発明の効果】この発明の塩化水素含有排ガスの処理方
法によれば、ダスト堆積層が厚くなっても、通気抵抗が
それほど大きくならず、そのため逆洗の回数をできるだ
け減らして塩化水素を高効率で除去することができる。According to the method for treating exhaust gas containing hydrogen chloride of the present invention, the ventilation resistance does not become so large even if the dust deposition layer becomes thick, and therefore the number of backwashing is reduced as much as possible to achieve high efficiency of hydrogen chloride. Can be removed with.
【００１７】このように反応率を向上させることによっ
て消石灰の供給量を節減することができる。By thus improving the reaction rate, the supply amount of slaked lime can be reduced.
【００１８】さらに、逆洗回数の減少によってフィルタ
の耐久性を向上させることもできる。Further, the durability of the filter can be improved by reducing the number of backwashing.
【図１】 この発明の実施例の方法を示すバグフィルタ
の断面図である。FIG. 1 is a sectional view of a bag filter showing a method according to an embodiment of the present invention.
【図２】 従来方法を示すバグフィルタの断面図であ
る。FIG. 2 is a sectional view of a bag filter showing a conventional method.
【図３】 堆積層の層厚(z) と通気抵抗（ΔＰ）との関
係を示すグラフである。FIG. 3 is a graph showing a relationship between a layer thickness (z) of a deposited layer and a ventilation resistance (ΔP).
【図４】 当量比とＨＣｌ除去率の関係を示すグラフで
ある。FIG. 4 is a graph showing the relationship between the equivalence ratio and the HCl removal rate.
１ バグフィルタ ２ ダスト堆積層 ３ 未反応の消石灰粒子 ４ 粒径不均一な炭酸カルシウム粒子 1 Bag filter 2 Dust accumulation layer 3 Unreacted slaked lime particles 4 Non-uniform particle size calcium carbonate particles
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 正 大阪府大阪市此花区西九条５丁目３番28号 日立造船株式会社内 (56)参考文献 特開 平１−155936（ＪＰ，Ａ) 特開 昭60−90028（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Kono 5-3-8 Nishi-Kujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (56) Reference JP-A-1-155936 (JP, A) Kai 60-90028 (JP, A)
Claims (1)
処理において、中和剤としての消石灰に粒径不均一な炭
酸カルシウムを混合して得られた混合物を該処理機の前
流で排ガス中に吹き込むことを特徴とする塩化水素含有
排ガスの処理方法。1. In exhaust gas treatment using a filter dust collecting type exhaust gas treatment machine, a mixture obtained by mixing slaked lime as a neutralizing agent with calcium carbonate having a non-uniform particle size is used as an exhaust gas in the upstream of the treatment machine. A method for treating hydrogen chloride-containing exhaust gas, which comprises blowing into the interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409483A JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409483A JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04250823A JPH04250823A (en) | 1992-09-07 |
| JPH0757305B2 true JPH0757305B2 (en) | 1995-06-21 |
Family
ID=18518813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2409483A Expired - Lifetime JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757305B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090028A (en) * | 1983-10-21 | 1985-05-21 | Mitsubishi Heavy Ind Ltd | Removing method of hydrogen chloride |
| JPH01155936A (en) * | 1987-12-11 | 1989-06-19 | Mitsui Eng & Shipbuild Co Ltd | Apparatus for removing acidic component from waste gas of dust incineration furnace |
-
1990
- 1990-12-28 JP JP2409483A patent/JPH0757305B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04250823A (en) | 1992-09-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19951205 |