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JPH01171661A - Dust collecting method for combustion gas of boiler in electrostatic precipitator - Google Patents

Dust collecting method for combustion gas of boiler in electrostatic precipitator

Info

Publication number
JPH01171661A
JPH01171661A JP62329766A JP32976687A JPH01171661A JP H01171661 A JPH01171661 A JP H01171661A JP 62329766 A JP62329766 A JP 62329766A JP 32976687 A JP32976687 A JP 32976687A JP H01171661 A JPH01171661 A JP H01171661A
Authority
JP
Japan
Prior art keywords
combustion gas
boiler
electrostatic precipitator
mixture
dust collection
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.)
Pending
Application number
JP62329766A
Other languages
Japanese (ja)
Inventor
Masaki Shoji
正樹 東海林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiho Kogyo Co Ltd
Original Assignee
Taiho Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taiho Kogyo Co Ltd filed Critical Taiho Kogyo Co Ltd
Priority to JP62329766A priority Critical patent/JPH01171661A/en
Publication of JPH01171661A publication Critical patent/JPH01171661A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/013Conditioning by chemical additives, e.g. with SO3

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrostatic Separation (AREA)

Abstract

PURPOSE:To enhance dust collection effect in an electrostatic precipitator by adding both a specified alkaline earth metallic compd. and an SO3 adsorbent of specified amount therefor to combustion gas contg. SO3 of a boiler and introducing this mixture into the electrostatic precipitator. CONSTITUTION:The mixture of both one or more kinds of alkaline earth metallic compds. selected from magnesium and calcium compds. and an SO3 adsorbent consisting of the rate of 5-50wt.% for this alkaline earth metallic compd. is added to combustion gas contg. SO3 of a boiler. Then this mixture is introduced into an electrostatic precipitator and dust collection of the combustion gas of the boiler is performed. As an embodiment of used magnesium compd. and calcium compd., CaCO3, CaO, MgCO3 and MgO, etc., are used. Further as the SO3 adsorbent, silica, alumina, iron oxide such as Fe2O3, diatomaceous earth, activated carbon, acid clay and bentonite, etc., are used.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、SO3を多く含むボイラ燃焼ガスの電気集
塵器における集塵効率を向上させるようにした集塵方法
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dust collection method that improves the dust collection efficiency in an electrostatic precipitator for boiler combustion gas containing a large amount of SO3.

(従来の技術) 重油、アスファルトなどの7i&黄分な多く含む燃料を
ボイラ燃焼させると、硫黄分はSO2になり、その一部
は更に酸化されてSOlになり、SO3を多く含むボイ
ラ燃焼ガスが排出される。
(Prior art) When fuel containing a large amount of 7i and yellow content, such as heavy oil or asphalt, is burned in a boiler, the sulfur content becomes SO2, a part of which is further oxidized and becomes SOl, and the boiler combustion gas containing a large amount of SO3 is It is discharged.

このようにSOlを多く含むボイラ燃焼ガスをそのまま
排出すると、硫酸腐食等の公害問題を引き起こすため、
一般には電気集塵器(以下、EPと記す)によって集塵
してから外部に排出するようにしているが、SO3を多
く含むボイラ燃焼ガスのEPによる集塵効率が極めて低
く、十分な集塵か行なわれないまま外部に排出されるこ
とになる。
If boiler combustion gas containing a large amount of SOl is discharged as it is, it will cause pollution problems such as sulfuric acid corrosion.
Generally, dust is collected using an electrostatic precipitator (hereinafter referred to as EP) before being discharged to the outside, but the efficiency of dust collection by EP for boiler combustion gas containing a large amount of SO3 is extremely low, and sufficient dust collection is insufficient. It will be discharged outside without being carried out.

この原因としては、上記のような燃焼ガス煤塵の見掛固
有電気抵抗値が低く、従来使用されているEPの良好な
集塵効率の良好な煤塵の電気抵抗値の範囲から逸脱して
いることか挙げられる。
The reason for this is that the apparent specific electrical resistance value of the combustion gas soot is low, and it deviates from the range of the electrical resistance value of soot dust for which conventionally used EP has good dust collection efficiency. There are several examples.

即ち、SO3を多く含むボイラ燃焼ガスの煤塵の見掛固
有電気抵抗値は102Ω・C11l〜lO′3Ω・cm
と相当低く、これに対して一般に煤塵の見掛固有電気抵
抗値と集塵効率との関係は第1図に示されるように、煤
塵の見掛固有電気抵抗値か104〜1010Ω・cmて
集塵効率が良好であるか、1010Ω・cm以」二及び
104Ω・cIfl以下では集塵効率か低下するのであ
る。
In other words, the apparent specific electrical resistance value of soot from boiler combustion gas containing a large amount of SO3 is 102Ω・C11l~lO′3Ω・cm
On the other hand, in general, the relationship between the apparent specific electrical resistance of soot and dust and the dust collection efficiency is shown in Figure 1. The dust collection efficiency is good, but the dust collection efficiency decreases below 10 10 Ω·cm and 10 4 Ω·cfl.

これは煤塵の見掛固有電気抵抗値が1o10Ω・cn+
以上の場合には集塵極板の粒子層によって逆電離現象を
起して集塵効率か低下し、逆に煤塵の見掛固有電気抵抗
値が104Ω・CDI以下の場合は集塵板に粒子か捕集
された瞬間に電荷を失い再飛散を起すため集塵効率か低
下するためである。
This is because the apparent specific electric resistance value of soot and dust is 1o10Ω・cn+
In the above cases, the particle layer of the dust collecting plate causes a reverse ionization phenomenon and the dust collection efficiency decreases, and conversely, if the apparent specific electrical resistance value of the soot dust is less than 104Ω・CDI, the particle layer on the dust collecting plate This is because the dust loses its charge the moment it is collected and re-scattering occurs, reducing the dust collection efficiency.

これに対して燃焼カス中のSO3濃度に応じたアンモニ
アなEP千手前ら注入して遊離のSO3を硫安として固
定化し、煤塵の見掛固有電気抵抗値をEPの適正範囲に
制御することか行なわれている。
To deal with this, an ammonia-based EP according to the SO3 concentration in the combustion residue is injected to fix the free SO3 as ammonium sulfate, and the apparent specific electrical resistance value of the soot and dust is controlled within the appropriate range for EP. It is.

(発明か解決しようとする課題) しかし、上記方法においてはSO3を完全に硫安にする
ために、アンモニアの注入量は排ガス中にアンモニアか
13ppm程度残存するように過剰に加えなければなら
ず、このためアンモニア資源の無駄ばかりてなく、アン
モニアの大気への放出という新たな公害をもたらしてい
る。
(Problem to be solved by the invention) However, in the above method, in order to completely convert SO3 into ammonium sulfate, an excessive amount of ammonia must be injected so that about 13 ppm of ammonia remains in the exhaust gas. This not only wastes ammonia resources, but also causes new pollution in the form of ammonia released into the atmosphere.

また、この方法て副生ずる硫安を主体とする電気集塵灰
は嵩比重か0.5〜1.0と小さく、嵩張り易く、この
ため処理コストか膨大になる。
Further, the electrostatically precipitated ash mainly composed of ammonium sulfate produced as a by-product in this method has a small bulk specific gravity of 0.5 to 1.0 and is easily bulky, resulting in an enormous processing cost.

更に、燃焼ガス中てのSO3とアンモニアとの反応は複
雑て、硫安を生成する過程で酸性硫酸アンモニウムを副
生ずることもあるか、これは融点が147℃と低く、且
つ腐食性に富むため、アンモニア注入ノズルの腐食閉塞
、集塵板、放電極の腐食閉塞等の障害を引き起すことが
屡々ある。
Furthermore, the reaction between SO3 in the combustion gas and ammonia is complex, and acidic ammonium sulfate may be produced as a by-product in the process of producing ammonium sulfate, which has a low melting point of 147℃ and is highly corrosive. This often causes problems such as corrosion and blockage of injection nozzles, dust collector plates, and discharge electrodes.

アンモニアの注入法に代るものとして、ナトリウム、カ
リウム等のアルカリ化合物、マグネシウム、カルシウム
等のアルカリ土類化合物を液状。
As an alternative to the ammonia injection method, alkaline compounds such as sodium and potassium, and alkaline earth compounds such as magnesium and calcium can be used in liquid form.

スラリー状、粉末状の形態で一部注入する試みがあるか
、この方法ては肝心のSO:lの吸収率か低く、所定の
吸収率を得るためには莫大な薬品を必要とするなどの欠
点かある。
Is there any attempt to inject some in the form of a slurry or powder, but this method has a low absorption rate for SO:L and requires a huge amount of chemicals to achieve the desired absorption rate? There are some drawbacks.

(課題を解決するための手段) この発明は、上記実情に鑑み上述のような燃焼カス中の
煤塵を電気集塵器で効果的に集塵する方法を開発するた
めに鋭意研究の結果、SO3を含むボイラ燃焼ガス中に
、マグネシウム化合物、カルシウム化合物の一種又は二
種以上からなるアルカリ土類化合物とSO3の吸着剤と
の混合物を添加して電気集塵器に送り込むようにした集
塵方法を提案するものであるう 即ち、この発明のようにアルカリ土類化合物と803の
吸着剤の混合物をボイラ燃焼ガス中に添加すると、極め
て効果的に803が捕捉され、その結果煤塵の見掛固有
電気抵抗値かEPの適正範囲に制御でき、所定の集塵効
率が得られるのである。
(Means for Solving the Problems) In view of the above-mentioned circumstances, the present invention was developed as a result of intensive research to develop a method for effectively collecting soot and dust in combustion scum as described above using an electrostatic precipitator. A dust collection method in which a mixture of an alkaline earth compound consisting of one or more of magnesium compounds and calcium compounds and an adsorbent for SO3 is added to the boiler combustion gas containing the mixture and sent to an electrostatic precipitator. That is, when a mixture of an alkaline earth compound and an 803 adsorbent is added to boiler combustion gas as in the present invention, 803 is captured extremely effectively, and as a result, the apparent specific electricity of soot and dust is reduced. The resistance value or EP can be controlled within an appropriate range, and a predetermined dust collection efficiency can be obtained.

なお、アルカリ土類化合物と803の吸着剤の混合物を
ボイラ燃焼ガス中に添加すると、極めて効果的にSO’
lか捕捉されるのは、SO3と混合物の接触過程てSO
3の吸着反応と中和反応か同時に進行するためと推定さ
れる。
Furthermore, when a mixture of alkaline earth compounds and 803 adsorbent is added to boiler combustion gas, SO' is extremely effectively removed.
What is captured is SO3 during the contact process between SO3 and the mixture.
It is presumed that this is because the adsorption reaction and neutralization reaction in step 3 proceed simultaneously.

この発明て使用するマグネシウム化合物、カルシウム化
合物としては、CaC0:+、Cab、 MgC01、
MgO1Ca(O旧。、Mg(OH)2、ドロマイトな
どSO:lを中和することかてきるマグネシウム化合物
、カルシウム化合物てあれば何れてもよく、またSO3
の吸着剤としてはシリカ、アルミナ、Fe2O,、、F
ezO<、Fe0011などの酸化鉄、ケイソウ土、活
性炭、酸性白土、ベントナイト、モレキュラーシーツ、
モンモリロナイトなど803に対して吸着能力のあるも
のてあれば何れてもよい。
The magnesium compounds and calcium compounds used in this invention include CaC0:+, Cab, MgC01,
Any magnesium compound or calcium compound that can neutralize SO:l, such as MgO1Ca(O), Mg(OH)2, or dolomite, may be used, or SO3
Adsorbents include silica, alumina, Fe2O,...F
Iron oxides such as ezO<, Fe0011, diatomaceous earth, activated carbon, acid clay, bentonite, molecular sheets,
Any material having adsorption ability for 803, such as montmorillonite, may be used.

アルカリ土類化合物に対する吸着剤の配合割合は5〜5
0Wt$かよく、5 Wt!以下テはso3ノ吸着が低
く、またsowtx以上てはSO3の吸着反応が主とな
り、SO□の中和化が妨げられ、その結果煤塵はpH値
が低く、見掛固有電気抵抗値が十分に上らず、集塵効率
が低下する。
The blending ratio of adsorbent to alkaline earth compound is 5 to 5.
0Wt$ or 5Wt! Below, the adsorption of SO3 is low, and above sowtx, the adsorption reaction of SO3 becomes the main one, preventing the neutralization of SO□, and as a result, the soot dust has a low pH value, and the apparent specific electrical resistance value is insufficient. dust collection efficiency decreases.

また、上記混合物は液状、粉状、スラリー状にしてボイ
ラ燃焼ガス中に添加するか、EP前に添加すると、極め
て効果的にSOコを捕捉することかてきるか、添加位置
はこれに限定されず、ボイラからEPの間てあれば、何
れてもよい。
In addition, if the above mixture is added to the boiler combustion gas in the form of liquid, powder, or slurry, or if added before EP, it will be possible to capture SO very effectively.The addition position is limited to this. It can be anywhere between the boiler and the EP.

更に、この発明の混合物の使用量は燃料の種類、燃焼条
件によって異なるが、燃料に対して10〜2000pp
mの範囲て適宜選択する。ここて10ppmより使用量
が少ないと集塵効果か余り期待することかてきず、20
00ppm以下では電気集塵灰の見掛固有電気抵抗値が
上昇し過ぎて集塵効率の低下を招くことになる。
Furthermore, the amount of the mixture of the present invention to be used varies depending on the type of fuel and combustion conditions, but is 10 to 2000 pp per fuel.
The range of m is selected as appropriate. Here, if the amount used is less than 10 ppm, the dust collection effect may not be as expected, and 20
If it is less than 0.00 ppm, the apparent specific electrical resistance value of the electrostatically collected ash will increase too much, leading to a decrease in dust collection efficiency.

(発明の効果) 以上要するに、この発明によればカルシウム化合物、マ
グネシウム化合物等のアルカリ土類化合物とSO3の吸
着剤の混合物をボイラ燃焼ガス中に添加すると、燃焼ガ
ス中のSO3が極めて効果的に捕捉され、その結果煤塵
の見掛固有電気抵抗値をEPの適正範囲に制御でき、所
定の集塵効率を挙げることかてきる。
(Effects of the Invention) In summary, according to the present invention, when a mixture of an alkaline earth compound such as a calcium compound or a magnesium compound and an adsorbent for SO3 is added to boiler combustion gas, SO3 in the combustion gas is extremely effectively removed. As a result, the apparent specific electrical resistance value of soot and dust can be controlled within the appropriate range of EP, and a predetermined dust collection efficiency can be achieved.

(実施例) 以下、この発明の実施例を示す。(Example) Examples of this invention will be shown below.

第2図は、この実施例に使用した燃焼装置を示すもので
、■はボイラ、2はエアヒータ、3は電気集塵器、4は
煙突、5はボイラl、エアヒータ2、電気集塵器3を接
続する煙道である。
Fig. 2 shows the combustion equipment used in this example. This is the flue that connects the.

なお、使用したボイラ1、電気集塵器3の概要及び稼動
条件を下記に示す。
The outline and operating conditions of the boiler 1 and electrostatic precipitator 3 used are shown below.

更に、下記配合の試料をフィーダ及び70〜100°C
の圧縮空気を利用して試料供給位置aから煙道5中に排
ガス流に向けて連続的に注入し、捕集集塵の性状変化及
び集塵性能について比較した。
Furthermore, a sample with the following composition was placed in a feeder and heated at 70 to 100°C.
Using compressed air, the samples were continuously injected from the sample supply position a into the flue 5 toward the exhaust gas flow, and the changes in the properties of the collected dust and the dust collection performance were compared.

その結果を下記衣に示す。The results are shown below.

1、ボイラ 型式:三菱CE自然循環形 最大連続蒸発量(T/I():35Ω 最高使用圧力(Kg/cm2) : 125最高使用温
度(’C):540 2、集塵器 三菱ルルギ式電気集塵器 稼動条件 蒸発量(T/f():300 燃料使用量(Kg/If):21.3 燃料の種類:C重油 燃料中の硫黄分(X):]、、8 エアヒータ出ロガス温度(’C):1.:10°Cボイ
ラ出日酸素ガス(%):1.8 排ガス流量(N I11’/H) :236000集塵
器内流速(m/5ec):1.5 集塵器出入ロ圧力損失(mmfl□0):2+3、試料
の配合組成及び供試条件 配合割合 供試条件 (1)水酸化マグネシウム 5部   1.5Kg/I
+酸性白土      1部 (2)炭酸カルシウム50部   3 、0 Kg/H
モレキュラーシーフ 7部 (3)酸化マグ* シラb   100部   0.5
Kg/+1ケイソウ上     7部 (4)水酸化カルシウム  2部   2.5Kg/I
+酸性白土      1部 (5)炭酸マグネシウム  10部   1.0Kg/
H酸化カルシウム   5部 Fe2O,、5部 (6)水酸化マグネシウム 30部   5.0Kg/
l(モンモリナイト   2部 シリカ       3部 (7)ドロマイト     10部   2.0Kg/
I+酸化カルシウム   10部 Fe0011      2部 アルミナ      1部
1. Boiler model: Mitsubishi CE natural circulation type Maximum continuous evaporation amount (T/I (): 35Ω Maximum operating pressure (Kg/cm2): 125 Maximum operating temperature ('C): 540 2. Dust collector Mitsubishi Rurugi type electric Dust collector operating conditions Evaporation amount (T/f(): 300 Fuel consumption (Kg/If): 21.3 Fuel type: Sulfur content in C heavy oil fuel (X):], 8 Air heater output log gas temperature ('C): 1.: 10°C boiler output oxygen gas (%): 1.8 Exhaust gas flow rate (N I11'/H): 236,000 Flow rate in dust collector (m/5ec): 1.5 Dust collection Pressure loss in and out of the vessel (mmfl□0): 2+3, Sample composition and test conditions Mixture ratio Test conditions (1) Magnesium hydroxide 5 parts 1.5Kg/I
+ 1 part acid clay (2) 50 parts calcium carbonate 3,0 Kg/H
Molecular Thief 7 parts (3) Oxide Mag* Shira b 100 parts 0.5
Kg/+1 diatom top 7 parts (4) Calcium hydroxide 2 parts 2.5Kg/I
+ 1 part of acid clay (5) 10 parts of magnesium carbonate 1.0Kg/
Calcium oxide 5 parts Fe2O, 5 parts (6) Magnesium hydroxide 30 parts 5.0Kg/
l (montmorinite 2 parts silica 3 parts (7) dolomite 10 parts 2.0Kg/
I + Calcium oxide 10 parts Fe0011 2 parts Alumina 1 part

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、電気集塵器における煤塵の見掛固有電気抵抗
値と集塵効率の関係を示す図、第2図は実施例に使用し
た燃焼装置の概略図である。 特許出願人 タイホーエ業株式会社 同 代理人 弁理士 福1)信行 ・−・”Qrli/
第1図
FIG. 1 is a diagram showing the relationship between the apparent specific electric resistance value of soot and dust in an electrostatic precipitator and the dust collection efficiency, and FIG. 2 is a schematic diagram of a combustion apparatus used in an example. Patent applicant: Taihohe Gyo Co., Ltd. Agent: Patent attorney Fuku1) Nobuyuki ---"Qrli/
Figure 1

Claims (1)

【特許請求の範囲】[Claims] SO_3を含むボイラ燃焼ガス中に、マグネシウム化合
物、カルシウム化合物の一種又は二種以上から選らばれ
たアルカリ土類金属化合物と該アルカリ土類金属化合物
に対して5〜50Wt%の割合で加えたSO_3の吸着
剤との混合物を添加して電気集塵器に送り込むようにし
たことを特徴とする電気集塵器におけるボイラ燃焼ガス
の集塵方法。
In the boiler combustion gas containing SO_3, an alkaline earth metal compound selected from one or more of magnesium compounds and calcium compounds and SO_3 added at a ratio of 5 to 50 wt% to the alkaline earth metal compound. A method for collecting boiler combustion gas in an electrostatic precipitator, characterized in that a mixture with an adsorbent is added and the mixture is sent to the electrostatic precipitator.
JP62329766A 1987-12-28 1987-12-28 Dust collecting method for combustion gas of boiler in electrostatic precipitator Pending JPH01171661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62329766A JPH01171661A (en) 1987-12-28 1987-12-28 Dust collecting method for combustion gas of boiler in electrostatic precipitator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62329766A JPH01171661A (en) 1987-12-28 1987-12-28 Dust collecting method for combustion gas of boiler in electrostatic precipitator

Publications (1)

Publication Number Publication Date
JPH01171661A true JPH01171661A (en) 1989-07-06

Family

ID=18225031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62329766A Pending JPH01171661A (en) 1987-12-28 1987-12-28 Dust collecting method for combustion gas of boiler in electrostatic precipitator

Country Status (1)

Country Link
JP (1) JPH01171661A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748766A1 (en) * 1995-06-16 1996-12-18 Rheinische Kalksteinwerke GmbH. Alkaline-earth metal carbonate based granulate with ab- or adsorptive compounds
JP2011125814A (en) * 2009-12-18 2011-06-30 Babcock Hitachi Kk Exhaust gas treatment method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5087961A (en) * 1973-12-10 1975-07-15
JPS6075318A (en) * 1983-09-30 1985-04-27 Takuma Co Ltd Treating apparatus of waste gas
JPS6271515A (en) * 1985-09-25 1987-04-02 Nippon Chem Ind Co Ltd:The Air cleaning agent

Patent Citations (3)

* Cited by examiner, † Cited by third party
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JPS6075318A (en) * 1983-09-30 1985-04-27 Takuma Co Ltd Treating apparatus of waste gas
JPS6271515A (en) * 1985-09-25 1987-04-02 Nippon Chem Ind Co Ltd:The Air cleaning agent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748766A1 (en) * 1995-06-16 1996-12-18 Rheinische Kalksteinwerke GmbH. Alkaline-earth metal carbonate based granulate with ab- or adsorptive compounds
JP2011125814A (en) * 2009-12-18 2011-06-30 Babcock Hitachi Kk Exhaust gas treatment method

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