JPS5824361A - Method and device for electrostatic dust collector - Google Patents
Method and device for electrostatic dust collectorInfo
- Publication number
- JPS5824361A JPS5824361A JP56122461A JP12246181A JPS5824361A JP S5824361 A JPS5824361 A JP S5824361A JP 56122461 A JP56122461 A JP 56122461A JP 12246181 A JP12246181 A JP 12246181A JP S5824361 A JPS5824361 A JP S5824361A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- droplets
- dust collection
- naoh
- caustic soda
- 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
Links
- 239000000428 dust Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 69
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 23
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007716 flux method Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 16
- 238000009835 boiling Methods 0.000 description 5
- 239000012717 electrostatic precipitator Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/013—Conditioning 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
Description
【発明の詳細な説明】
この発明は電気束じん方法および装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric flux method and apparatus.
電気束じん装置で含しんガスの集じんを行なう場合に、
ダストの電気比抵抗が高い場合には集じん極上に捕集さ
れたダスト層の電荷の中和が行われにくいために、ダス
ト層の電位が異常に上昇して、いわゆる逆電離現象が発
生し、集じん性能が極度に悪化することは、よく知られ
ている。When collecting dust from gas containing gas using an electric dust collection device,
When the electrical resistivity of dust is high, it is difficult to neutralize the charge in the dust layer collected on the dust collecting plate, and the potential of the dust layer increases abnormally, causing a so-called reverse ionization phenomenon. It is well known that dust collection performance deteriorates extremely.
このような集じん性能の悪化を防止するためには・ （１）電極、その他の集じん機の構造の改良。To prevent such deterioration of dust collection performance, (1) Improving the structure of electrodes and other dust collectors.
（２）放電極への電圧の印加条件の改良。(2) Improving the conditions for applying voltage to the discharge electrode.
（３）含しんガス中への少量の特定物質の添加。(3) Addition of a small amount of specific substance to gas containing gas.
などの対策がとられる。Measures such as these will be taken.
本発明は、上記の内の第（３）項に関するものである。The present invention relates to item (3) above.
第（３）項に関するものとしては、 ８０３ガスの添
加がよく知られている。Regarding item (3), the addition of 803 gas is well known.
ＳＯａガスを添加した場合、集じん率の低下が防止でき
る理由としては、Ｓ０３ガスがガス中の水蒸気とともに
ダストの表面に吸着されて硫酸となり。The reason why the drop in dust collection rate can be prevented when SOa gas is added is that SO3 gas is adsorbed on the dust surface together with the water vapor in the gas and becomes sulfuric acid.
ダストの表面に電気伝導性のよい、っまシ比抵抗の低い
膜を形成するので、それが集じん極上に捕集されれば集
じん極上のダスト層の比抵抗はダストの本来の比抵抗よ
りも低くな６るから、逆電離の発生が防止されるためと
１れてい”る。A film with good electrical conductivity and low specific resistance is formed on the surface of the dust, so if it is collected on the dust collection layer, the specific resistance of the dust layer on the dust collection layer will be equal to the original resistivity of the dust. It is said that this is because the occurrence of reverse ionization is prevented because the temperature is lower than that of 6.
したがって、この方法が効果を発揮するのは。Therefore, this method is effective.
含しんガスの温度が硫酸の沸点よりも低い場合である。This is the case when the temperature of the gas containing gas is lower than the boiling point of sulfuric acid.
′硫酸の沸点は濃度によって異るが、最高値は濃度約９
８％における′！Ｉ３８℃である。それで、ガス温度が
これよりも高い場合は、 ＳＯ３の添加はその効果は
期待できな１４ｏ１．；’たがって、この方法はガス温
度が１５０℃前後である。いわゆる低温側電気集じん機
に主として適用されている。'The boiling point of sulfuric acid varies depending on the concentration, but the highest value is at a concentration of about 9
'! in 8%! I38°C. Therefore, if the gas temperature is higher than this, the addition of SO3 cannot be expected to be effective. ;'Therefore, in this method, the gas temperature is around 150°C. It is mainly applied to so-called low-temperature side electrostatic precipitators.
したがって、ガス一度が６５０℃前後で運転される。い
わゆる高温側電気集じん機においては。Therefore, the gas is operated at around 650°C. In the so-called high temperature side electrostatic precipitator.
ガス温度が硫酸の沸点よりも高くなる場合が多く。The gas temperature is often higher than the boiling point of sulfuric acid.
その場合は５ｃ１３の添加は適用できない。In that case, addition of 5c13 cannot be applied.
本発明は以上のように硫酸の沸点よりも高いガス温度で
運転される電気ｉピん機において、集じん極上のダスト
層の比抵抗を下げて逆電離の発生を防止する方法および
装置を提供するものである。As described above, the present invention provides a method and apparatus for reducing the resistivity of the dust layer on the dust collecting plate and preventing the occurrence of reverse ionization in an electric i-pump machine operated at a gas temperature higher than the boiling point of sulfuric acid. It is something to do.
Ｓ０３の添加がダスト層の比抵抗を下げる理由は前述の
ように、その比抵抗がダストよりもはるかに低い硫酸の
膜がダストの表面に形成されるためであるから、高温側
電気集じん機においても、低温側における硫酸と同様に
比抵抗の低い膜を形成する物質を添加すれば門いはずで
ある。この目的にかなうｉ質として苛性ソーダ（以下、
ＮａＯＨと記す）がある。As mentioned above, the reason why the addition of S03 lowers the resistivity of the dust layer is that a sulfuric acid film whose resistivity is much lower than that of the dust is formed on the surface of the dust. Similarly to sulfuric acid at low temperatures, adding a substance that forms a film with low resistivity should solve the problem. Caustic soda (hereinafter referred to as
(written as NaOH).
ＮａＯＨは融点が約３１８℃、沸点が約１３９０℃であ
るから高温側電気集じんの運転温度の３５０℃前後では
液体状であり、しかもその電気比抵抗は６５０℃におい
て約４．２ Ｘ １０−’Ｑ−ｃｒｒｒｃ＋硫酸の１．
４ Ｘ １０°〜Ｉ Ｘ １０’Ω１（濃度によって異
なる）よりもさらに低い。 。Since NaOH has a melting point of about 318°C and a boiling point of about 1390°C, it is in a liquid state at around 350°C, which is the operating temperature of the high-temperature side electrostatic precipitator, and its electrical resistivity is about 4.2 x 10- at 650°C. 'Q-crrrc+sulfuric acid 1.
Even lower than 4 x 10° to I x 10'Ω1 (depending on concentration). .
したがって、このＮａＯＨを微細な粉末あるいは液滴な
どにして含しんガス中５添加し、それが含しんガスとと
もに集じん区間に到達するまでに溶融状態の液滴になっ
ているようにすることができｔば、このＮａＯＨの液滴
も放電極から放射されるイオンのために帯電するので、
ダストと全く同様に電気集じん作用をうけて集じん極上
に捕集される。Therefore, it is possible to add this NaOH in the form of fine powder or droplets to the gas containing the gas so that it becomes a molten droplet by the time it reaches the dust collection section together with the gas containing the gas. If possible, this NaOH droplet will also be charged due to the ions emitted from the discharge electrode, so
Just like dust, it is collected on the top of the dust collector by electrostatic collection.
捕集されたＮａＯＨは、その前に捕集された。あるいは
その後から捕集されるダスト粒子と強制的に接触させら
れるから、ダストの表面に付着して比抵抗の低い膜を形
成し、その結果、集じん極上のダスト層の比抵抗は低く
なり、゛逆電離の発生が防ＩＦされる。The collected NaOH was collected before that. Alternatively, since it is forcibly brought into contact with the dust particles that are subsequently collected, it adheres to the dust surface and forms a film with low resistivity, and as a result, the resistivity of the dust layer on the top of the dust collection becomes low. ``The occurrence of reverse ionization is prevented by IF.
ＮａＯＨの添加方法としては。As for the method of adding NaOH.
（１） ＮａＯＨは常温では固形であるから、これを
微細に粉砕して添加する。(1) Since NaOH is solid at room temperature, it is finely ground and added.
（２）加熱溶融してノズルにより噴霧添加する。(2) Heat and melt and add by spraying with a nozzle.
（３）水溶液にしてノズルにより噴霧添加する。(3) Make an aqueous solution and add by spraying with a nozzle.
などの方法が考えられる。Possible methods include:
この内、（１）はＬａＯＨをダストと同程度の太きさま
で粉砕し、かつ定量的に添加するためには高性能の粉砕
装置および定量供給分散装置が必要である。Of these, (1) requires a high-performance pulverizer and quantitative supply/dispersion device in order to pulverize LaOH to a size comparable to that of dust and add it quantitatively.
まだ、（２）では加熱溶融装置が必要であシ、その操作
には危険もともない、いづれも設備、運転および保守の
面で負担が太きい。However, (2) requires a heating and melting device, which is inherently dangerous to operate, and both require a heavy burden in terms of equipment, operation, and maintenance.
これに対して（３）の方法は設備も極めて簡単であ。On the other hand, method (3) requires extremely simple equipment.
す：操作もまた簡単であって制御もしやすいのでこの方
法が最も実施しやすい。S: This method is the easiest to implement because it is easy to operate and control.
（３）の方法によるときは、添加された液滴は集じん区
間に到達するまでに水分を蒸発させ、さらに昇温して溶
融状態になっていなければならないが噴霧装置で数１０
μｍ以下の極めて小さい液滴になるように噴霧させれば
溶融を完了するまでの所゛要時間は短いので、その時間
を確保できるように集じん機の入口より若干前方のダク
ト内に噴霧添加するようにしておけばよい。When using the method (3), the added droplets must evaporate the water before reaching the dust collection zone, and then be heated to a molten state.
If the liquid is sprayed into extremely small droplets of micrometers or less, the time required to complete melting is short, so in order to secure that time, the spray is added into the duct slightly in front of the entrance of the dust collector. All you have to do is do it.
つぎに図面に示す実施例にもとづいて本発明の詳細な説
明する。Next, the present invention will be described in detail based on embodiments shown in the drawings.
図は本発明の一実施例を示すものである。本図において
、符号１は含しんガスの人口ダクトで。The figure shows one embodiment of the invention. In this figure, numeral 1 is an artificial duct containing gas.
電気集じん機本体のケーシング２の入口に連通されてい
る。ろは整流板である。ケーシング、２内には集じん電
極（集じん極ともいう）４および放電電極（放電極とも
いう）５が含しんガスの流れの方向に泊って配列され、
集じん区間を形成している。６はＮａＯＨの水溶液を微
細な液滴に噴霧するための噴霧装置、７はＮａＯＨ水溶
液のタンク、８は送成用ポンプ、９はＮａＯＨ水溶液の
送液パイプ、１０は噴霧装置６が三原体形のノズルであ
る場合の噴霧用の圧縮空気あるいはスチームデどの供給
用のパイプである。なお、バルブは図己説明を省略する
。It communicates with the inlet of the casing 2 of the electrostatic precipitator main body. The filter is a rectifier plate. Inside the casing 2, a dust collection electrode (also referred to as a dust collection electrode) 4 and a discharge electrode (also referred to as a discharge electrode) 5 are arranged in the direction of the flow of the dust-containing gas,
It forms a dust collection area. 6 is a spraying device for spraying an aqueous NaOH solution into fine droplets, 7 is a tank for the NaOH aqueous solution, 8 is a pump for feeding, 9 is a liquid feeding pipe for the NaOH aqueous solution, and 10 is a spraying device 6 in the form of a three-dimensional structure. In the case of a nozzle, this is a pipe for supplying compressed air or steam for spraying. Note that the explanation of the valves will be omitted.
含しんガスは矢印Ｐで示す方向う・ら入口ダクト１を通
過し、整流板６を経てケーシング２内に入る。The gas containing gas passes through the inlet duct 1 in the direction indicated by the arrow P, and enters the casing 2 via the baffle plate 6.
含しんガスは更に集じん区間を通過するが１通過する間
に含有ダストは電気集じん作用により集じん極４上に捕
集され、それが一定量になると電極を槌打して下方のホ
ッパ（図示してない）に落ドさせ９機外に排出する。The dust-containing gas further passes through the dust collection section, and during one pass, the dust contained is collected on the dust collection electrode 4 by electrostatic precipitator action, and when it reaches a certain amount, the electrode is hammered and sent to the hopper below. (not shown) and ejected outside the aircraft.
しかし、ダストの電気比抵抗が高い場合には前記したよ
うに、集じん極上のダスト層に逆電離が発生して集じん
率が低下する。However, when the electrical resistivity of the dust is high, as described above, reverse ionization occurs in the dust layer on the dust collection layer, resulting in a decrease in the dust collection rate.
本発明では、このような場合に噴霧装置６からＮａＯＨ
の水溶登を微細な液滴にして含しんガスに添加する。In the present invention, in such a case, NaOH is removed from the spray device 6.
The water dissolved in water is added to the aqueous gas in the form of fine droplets.
添加されだ液滴は、含しんガスに同伴されてケーシング
２内に入り、集じん区間に到達する。しかし、それまで
に水分を蒸発させ、さらに昇温し。The added droplets enter the casing 2 along with the gas containing gas and reach the dust collection section. However, by then the water has evaporated and the temperature has risen further.
溶融しており、この状態で集じん区間に入ると。It is molten and enters the dust collection area in this state.
放電極から放射されるイオンをあびて帯電し、ダストと
同様に電気集じん作用を受けて集じん極上に捕集される
。It is charged by the ions emitted from the discharge electrode, and is collected on the dust collector by the electrostatic action similar to dust.
したがって、集じん極上でダストとＮａＯＨは強制的に
接触させられるため、比抵抗の高いダストの表面に比抵
抗の低い溶融ＮａＯＨの膜が形成されることになり、そ
の結果、集じん極上のダスト層の比抵抗はダストのみの
場合よりも低くなり、逆電離の発生が防止される。Therefore, the dust and NaOH are forcibly brought into contact on the top of the dust collector, and a film of molten NaOH with low resistivity is formed on the surface of the dust with high resistivity, and as a result, the dust on the top of the dust collector forms. The specific resistance of the layer is lower than that of dust alone, and the occurrence of back ionization is prevented.
本実施例は噴霧装置６を１個だけ使用したものであるが
、ダクトが大型の場合には複数個使用しダクトの内面全
体にできるだけ均一にＮａＯＨ水溶液を分散させるほう
が好ましいことは勿論である。Although this embodiment uses only one spray device 6, if the duct is large, it is of course preferable to use a plurality of spray devices to disperse the NaOH aqueous solution as uniformly as possible over the entire inner surface of the duct.
図は本発明を実施するだめの一実施例の要部横断平面図
である。
１は入口ダクト、２はケーシング、３は整流板。
４は集じん電極、５は放電電極、６は噴霧装置。
７はＮａ ＯＨの水溶液タンク、８は送液ポンプ、９は
送液パイプ、１０は圧縮空気あるいはスチームなどの供
給用のパイプである。
特許出願人 宇部興産株式会社The figure is a cross-sectional plan view of essential parts of an embodiment of the invention. 1 is the inlet duct, 2 is the casing, and 3 is the rectifier plate. 4 is a dust collection electrode, 5 is a discharge electrode, and 6 is a spray device. 7 is an aqueous solution tank of Na OH, 8 is a liquid feeding pump, 9 is a liquid feeding pipe, and 10 is a pipe for supplying compressed air, steam, etc. Patent applicant: Ube Industries, Ltd.
Claims (2)
抵抗が高いダストを含む高温の含しんガスに苛性ソーダ
水溶液を微細な液滴にして添加し。 液滴中の水分の蒸発と残留した苛性ソーダの昇温溶融を
させ、集じん区間においてこの溶融苛性ソーダの液滴を
ダストとともに集じん電極上に捕集することにより集じ
ん電極上のダスト層の電気比抵抗を下げて逆電離の発生
を防止するようにしたことを特徴とする電気束じん方法
。(1) Before the dust-containing gas reaches the dust collection section, a caustic soda aqueous solution is added in fine droplets to the high-temperature dust-containing gas containing dust with high electrical resistivity. The water in the droplets is evaporated and the remaining caustic soda is heated and melted, and the droplets of molten caustic soda are collected on the dust collection electrode along with the dust in the dust collection section, thereby reducing the electricity of the dust layer on the dust collection electrode. An electric flux method characterized by lowering specific resistance and preventing the occurrence of reverse ionization.
中に添加するための噴霧装置を入口ダクト内に設置した
ことを特徴とする電気束じん装置。(2) An electric flux device characterized in that a spraying device for adding a caustic soda aqueous solution into minute droplets into a gas containing gas is installed in an inlet duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56122461A JPS5824361A (en) | 1981-08-06 | 1981-08-06 | Method and device for electrostatic dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56122461A JPS5824361A (en) | 1981-08-06 | 1981-08-06 | Method and device for electrostatic dust collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5824361A true JPS5824361A (en) | 1983-02-14 |
Family
ID=14836424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56122461A Pending JPS5824361A (en) | 1981-08-06 | 1981-08-06 | Method and device for electrostatic dust collector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5824361A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0640709A (en) * | 1992-04-23 | 1994-02-15 | Kao Corp | Stable sodium peroxocarbonate, production thereof and bleach cleaning agent composition containing stable sodium peroxocarbonate |
-
1981
- 1981-08-06 JP JP56122461A patent/JPS5824361A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0640709A (en) * | 1992-04-23 | 1994-02-15 | Kao Corp | Stable sodium peroxocarbonate, production thereof and bleach cleaning agent composition containing stable sodium peroxocarbonate |
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