JPH0698321B2 - Electric dust collector temperature control method - Google Patents
Electric dust collector temperature control methodInfo
- Publication number
- JPH0698321B2 JPH0698321B2 JP2270099A JP27009990A JPH0698321B2 JP H0698321 B2 JPH0698321 B2 JP H0698321B2 JP 2270099 A JP2270099 A JP 2270099A JP 27009990 A JP27009990 A JP 27009990A JP H0698321 B2 JPH0698321 B2 JP H0698321B2
- Authority
- JP
- Japan
- Prior art keywords
- dust collecting
- temperature
- dust
- gas
- thermometer
- 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.)
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- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明は、亜硫酸ガス（SOx）を含む含塵ガスを取り扱
う乾式電気集塵装置の温度管理方法に関するものであ
る。TECHNICAL FIELD The present invention relates to a temperature control method for a dry type electrostatic precipitator that handles dust-containing gas containing sulfurous acid gas (SOx).
（ロ）従来技術 一般に、第１図に示すように、従来の水平流電気集塵装
置は、一方にガス入口22が設けられ、他方にガス出口23
が設けられ、内部に複数のフィールド24に分割された集
塵室５が設けられ、下方にホッパ26が設けられ、各フィ
ールド24毎に集塵板３の下部に槌打装置28が設けられて
いる。また、集塵板３に付着堆積した集塵ダストは、集
塵板下部の槌打によりホッパ26へ落下集積されているの
で、ホッパ部にガスが流れないように、各フィールド毎
にガス遮断板11が設置されている。(B) Prior Art Generally, as shown in FIG. 1, a conventional horizontal flow electrostatic precipitator is provided with a gas inlet 22 on one side and a gas outlet 23 on the other side.
Is provided, a dust collecting chamber 5 divided into a plurality of fields 24 is provided therein, a hopper 26 is provided below, and a hammering device 28 is provided below the dust collecting plate 3 for each field 24. There is. Further, the dust collected and deposited on the dust collecting plate 3 is dropped and accumulated in the hopper 26 by hammering the lower part of the dust collecting plate, so that the gas blocking plate is provided for each field so that the gas does not flow into the hopper portion. 11 are installed.
その結果、ガスが流れてる集塵部と、ガスが滞留してい
るホッパ部とに温度差が発生し、その境界面付近のガス
遮断板11がある種塵板３の下部の槌打部分４の温度勾配
が急激になる。As a result, a temperature difference occurs between the dust collecting portion in which the gas flows and the hopper portion in which the gas is retained, and the hammering portion 4 below the seed dust plate 3 having the gas blocking plate 11 near the boundary surface thereof. The temperature gradient of becomes sharp.
亜硫酸ガス（SOx）を含む含塵ガスでは、酸露点以下の
温度でSOx→H2SO4となり、集塵板３の下部に硫酸腐食が
発生する。この腐食が進行すると、集塵板３の下部の槌
打部分４が脱落に至り、集塵性能の大幅な低下を引き起
こす。性能回復のためには、集塵板３の更新が必要とな
り、膨大な更新費用を要する。In a dust-containing gas containing sulfurous acid gas (SOx), SOx → H 2 SO 4 occurs at a temperature below the acid dew point, and sulfuric acid corrosion occurs in the lower part of the dust collecting plate 3. When this corrosion progresses, the hammered portion 4 below the dust collecting plate 3 comes off, causing a significant decrease in dust collecting performance. In order to recover the performance, it is necessary to update the dust collecting plate 3, which requires a huge update cost.
そこで、集塵板３の下部を常に酸露点以上にするため
に、集塵板３の下部直近部のガス温度を測定することが
不可欠である。しかし、集塵板３の直近部は、放電極と
の間に約300Kv/mもの高電界を生じており、この高電界
のために、集塵板３の直近部に温度計（通常、熱電対）
29を設置すると、最大で放電極と同電位である約45Kv
（集塵板は接地）もの高電圧となり、電気集塵装置の系
外に置かれた温度計29の変換器31および記録計に障害を
与え、集塵板３の直近部のガス温度を測定することは無
理であった。Therefore, in order to always keep the lower part of the dust collecting plate 3 above the acid dew point, it is essential to measure the gas temperature in the immediate vicinity of the lower part of the dust collecting plate 3. However, a high electric field of about 300 Kv / m is generated between the dust collecting plate 3 and the discharge electrode, and due to this high electric field, a thermometer (usually a thermoelectric versus)
When 29 is installed, the maximum potential is about 45 Kv, which is the same potential as the discharge electrode.
(Dust collecting plate is grounded) High voltage causes damage to converter 31 and recorder of thermometer 29 placed outside the system of the electric dust collector, and measures gas temperature in the immediate vicinity of dust collecting plate 3. It was impossible to do.
したがって、従来は集塵板３の直近部から電界の影響の
少ないガス遮断板11の外側位置で温度測定を行っていた
ため、集塵板３の下部の温度を正確に把握できず、常に
酸露点以上で温度管理をすることができなかった。Therefore, conventionally, since the temperature is measured from the immediate vicinity of the dust collecting plate 3 to the outside of the gas blocking plate 11 where the influence of the electric field is small, the temperature of the lower portion of the dust collecting plate 3 cannot be accurately grasped, and the acid dew point is always maintained. With the above, it was not possible to control the temperature.
第２図に示すように、集塵板３と放電極１との間は、約
300Kv/mの高電界であるので、温度測定をしたい集塵板
槌打部４の直近に温度計（通常、熱電対）29を設置する
と、温度計29の表面に放電極１からコロナ放電によって
生じたイオン２が帯電する。リード線６の表面をその
帯電したイオン２が流れ、電気集塵装置のケーシング
８の外側に設置した変換機９および、記録計10に障害を
与え、温度測定不能となっていた。As shown in FIG. 2, the space between the dust collecting plate 3 and the discharge electrode 1 is about
Since a high electric field of 300 Kv / m, if a thermometer (usually a thermocouple) 29 is installed in the immediate vicinity of the dust collecting plate hammering section 4 for which temperature measurement is desired, the surface of the thermometer 29 will be affected by corona discharge from the discharge electrode 1. The generated ions 2 are charged. The charged ions 2 flowed on the surface of the lead wire 6 and damaged the converter 9 and the recorder 10 installed outside the casing 8 of the electrostatic precipitator, and the temperature could not be measured.
（ハ）発明が解決しようとする課題 本発明が解決しようとする課題は、温度計の表面に帯電
したイオンを接地させ、温度計に電圧がかからないよ
うにし、変換器、記録計への障害を防止して、集塵板槌
打の直近部のガス温度を測定し、常に酸露点以上にガス
温度管理を行い、集塵板下部の酸露点腐食を確実に防止
する方法を得ることにある。(C) Problem to be Solved by the Invention The problem to be solved by the present invention is to ground charged ions on the surface of a thermometer so that no voltage is applied to the thermometer and to prevent obstacles to the converter and recorder. Another object of the present invention is to obtain a method for reliably preventing acid dew point corrosion at the bottom of the dust collecting plate by measuring the gas temperature in the immediate vicinity of hammering the dust collecting plate and constantly controlling the gas temperature above the acid dew point.
（ニ）課題を解決するための手段 本発明の電気集塵装置の温度管理方法は、一方にガス入
口が設けられ、他方にガス出口が設けられ、内部に複数
のフィールドに分割された集塵室を有する水平電気集塵
装置において、前記集塵室の各フィールド毎に高電圧、
高ダスト濃度に耐える温度計であって、一端を開放した
電導性の管の内面に絶縁体を付着し、その内部に熱電対
を挿入し、該管の開放単に電導性の網をかぶせ、該管を
接地した構造の温度計を設置すること、該温度計によっ
て集塵板直近部のガス温度を測定すること、該測定ガス
温度パターンから将来の温度パターンを予測すること、
該予測温度パターンにもとづいて含塵ガス発生設備の運
転条件を制御し、前記集塵装置内の集塵板の下部槌打部
付近のガス温度が酸露点よりも高いほぼ一定温度となる
ようにすることからなる手段によって、上記課題を解決
している。(D) Means for Solving the Problems In the temperature control method for an electrostatic precipitator of the present invention, a gas inlet is provided on one side and a gas outlet is provided on the other side, and the dust is divided into a plurality of fields inside. In a horizontal electrostatic precipitator having a chamber, high voltage for each field of the dust chamber,
A thermometer capable of withstanding a high dust concentration, an insulator is attached to the inner surface of a conductive tube having one end opened, a thermocouple is inserted into the inside, and the tube is simply covered with a conductive net, Installing a thermometer having a structure in which the pipe is grounded, measuring the gas temperature in the immediate vicinity of the dust collecting plate by the thermometer, predicting a future temperature pattern from the measured gas temperature pattern,
The operating conditions of the dust-containing gas generating equipment are controlled based on the predicted temperature pattern so that the gas temperature near the lower hammering part of the dust collecting plate in the dust collecting device becomes substantially constant temperature higher than the acid dew point. The above problem is solved by means of
（ホ）実施例 本発明の方法の一実施例を適用した水平流式電気集塵装
置を第１図および第３図に示す。この電気集塵装置21
は、一方にガス入口22が設けられ、他方にガス出口23が
設けられ、内部ガス流れ方向20に複数のフィールド24
（図面では３つ）に分割された集塵室５が設けられ、下
方にホッパ26が設けられている。集塵室５の各フィール
ド毎にガス流方向20に平行に複数枚の集塵板３が設けら
れている。各集塵板３の中間に図示しない放電極１（第
２図参照）が設けられ、フィールド24の入側および出側
の集塵板３の下部（集塵部槌打部４）に槌打装置28が設
けられている。(E) Example A horizontal flow type electrostatic precipitator to which an example of the method of the present invention is applied is shown in FIGS. 1 and 3. This electric dust collector 21
Is provided with a gas inlet 22 on one side and a gas outlet 23 on the other side, and a plurality of fields 24 in the internal gas flow direction 20 are provided.
A dust collection chamber 5 divided into (three in the drawing) is provided, and a hopper 26 is provided below. A plurality of dust collecting plates 3 are provided in each field of the dust collecting chamber 5 in parallel to the gas flow direction 20. An unillustrated discharge electrode 1 (see FIG. 2) is provided in the middle of each dust collecting plate 3, and the lower part (dust collecting part hammering part 4) of the dust collecting plate 3 on the entry side and the output side of the field 24 is hammered. A device 28 is provided.
集塵板槌打部４には、ガスをホッパ26に流さないため
に、ガス遮断板11が各フィールド24毎に集塵板３の入側
および出側に設けられている。さらに、集塵板槌打部４
のガス温度測定のために、ガス遮断板11を貫通させて本
発明にもとづく温度計29aを設けている。In the dust collecting plate hammering unit 4, gas blocking plates 11 are provided on the inlet side and the outlet side of the dust collecting plate 3 for each field 24 in order to prevent gas from flowing into the hopper 26. Further, the dust collecting plate hammering unit 4
In order to measure the gas temperature, the thermometer 29a according to the present invention is provided by penetrating the gas blocking plate 11.
温度計29aは、第３図に示すように外側を導電体38（腐
食防止のためSUS316-L）で囲み、内側に絶縁体36を設け
る。その内部に熱電対35を入れる。熱電対35の先端は、
ガスが直接測温できるように網37（腐食防止のためSUS3
16-L）を設ける。導電体35は接地されているケーシング
８と溶接固定する。また、ケーシング８の内外は、圧力
が異なるため、ケーブル40と温度計29aとはシール構造
とする。温度計29aに付着したダストは集塵板３と同様
に槌打装置28で除去する。As shown in FIG. 3, the thermometer 29a is surrounded by a conductor 38 (SUS316-L for corrosion prevention) on the outside and an insulator 36 on the inside. Put thermocouple 35 inside. The tip of the thermocouple 35 is
Net 37 to measure temperature of gas directly (SUS3 to prevent corrosion)
16-L). The conductor 35 is welded and fixed to the casing 8 which is grounded. Since the pressure inside and outside the casing 8 is different, the cable 40 and the thermometer 29a have a seal structure. Dust adhering to the thermometer 29a is removed by a hammering device 28 as with the dust collecting plate 3.
第１図および第３図に示すように、放電極１からコロナ
放電で生じたイオン２は、導電体38の表面を取り囲む
が、導電体38がケーシング８に溶接され接地されている
ので、イオンは直ちに接地され、導電体38の表面に
イオンの蓄積は起こらない。As shown in FIGS. 1 and 3, the ions 2 generated by the corona discharge from the discharge electrode 1 surround the surface of the conductor 38, but since the conductor 38 is welded to the casing 8 and grounded, Is immediately grounded and no accumulation of ions occurs on the surface of the conductor 38.
また同様に、熱電対35の先端部の網37についてもイオ
ン２は網37が接地されているので、網37に捕捉され、直
ちに接地され、イオン２の蓄積は起こらず電圧を生じ
ない。Similarly, with respect to the net 37 at the tip of the thermocouple 35, the ion 2 is grounded, so that the net 37 is captured by the net 37 and immediately grounded, and the ion 2 does not accumulate and no voltage is generated.
導電体38の内部は絶縁体36を設けられているため、温度
計29aの内部空間42は外部と静電遮断された状態とな
り、集塵板槌打部４が約300Kv/mの高電界にかかわら
ず、高電界の影響を受けない。また網37により、ガスは
内部に入ることができるので、内部空間42に熱電対35を
設置すれば、高電界の影響を受けずに、ガス温度の測定
が可能となる。Since the insulator 36 is provided inside the conductor 38, the internal space 42 of the thermometer 29a is in a state of being electrostatically shielded from the outside, and the dust collector hammering section 4 is set to a high electric field of about 300 Kv / m. Nevertheless, it is not affected by the high electric field. Further, since the gas can enter the inside by the net 37, if the thermocouple 35 is installed in the internal space 42, the gas temperature can be measured without being affected by the high electric field.
また、温度計29aは集塵板３と同様の働きにより、帯電
されたダストの付着もあり、周りにダストの堆積を防止
するので、槌打装置28によりダストを払い落とす。Further, since the thermometer 29a has a function similar to that of the dust collecting plate 3, there is adhesion of charged dust and prevents accumulation of dust around, so that the hammer device 28 removes the dust.
本発明により、従来測定不能であった集塵板槌打部４の
温度測定が可能となり、集塵板槌打部４の温度を常に酸
露点以上のほぼ一定温度に維持すれば、集塵室５内の腐
食を防止できる。According to the present invention, it is possible to measure the temperature of the hammering part 4 of the dust collecting plate, which cannot be measured conventionally, and if the temperature of the hammering part 4 of the dust collecting plate is always maintained at a substantially constant temperature above the acid dew point, the dust collecting chamber The inside of 5 can be prevented.
集塵板槌打部４の温度データはコンピュータ32に送ら
れ、過去の温度パターンから将来の温度パターンを予測
し、常に集塵板槌打部４の温度が酸露点以上にほぼ一定
温度となるようにガス発生設備の運転条件制御器33にフ
ィードバックさせる。The temperature data of the dust collecting plate hammering section 4 is sent to the computer 32 to predict the future temperature pattern from the past temperature pattern, and the temperature of the dust collecting plate hammering section 4 is always a constant temperature above the acid dew point. As described above, the feedback is provided to the operating condition controller 33 of the gas generating equipment.
第４図は本発明にもとづく温度計29aの変更例を示す。
（Ａ）図は、槌打装置28の作動を確実にするために、導
電体38の外面に槌打座39を設けた例を示す。（Ｂ）図は
網37に付着するダストを除去するために導電体38の内部
空間42内に導管41を設けてその先端から間欠的に圧縮空
気を噴出する例を示す。FIG. 4 shows a modification of the thermometer 29a according to the present invention.
FIG. 9A shows an example in which a hammering seat 39 is provided on the outer surface of the conductor 38 in order to ensure the operation of the hammering device 28. FIG. 3B shows an example in which a conduit 41 is provided in the internal space 42 of the conductor 38 to remove dust adhering to the net 37, and compressed air is intermittently ejected from the tip thereof.
電気集塵装置21は、接地されている集塵板３に対し、放
電極１を45Kv程度にして放電極１をコロナ放電させ
る。その結果生じたイオンでサダスト粒子を帯電さ
せ、集塵板３と放電極１との間の高電界（約300Kv/m）
によるクーロン力で帯電ダストを集塵板３へ捕集させ
る。The electrostatic precipitator 21 sets the discharge electrode 1 to about 45 Kv with respect to the grounded dust collection plate 3 and causes the discharge electrode 1 to perform corona discharge. The resulting ions charge the dust particles, and a high electric field (about 300 Kv / m) between the dust collector 3 and the discharge electrode 1.
The charged dust is collected on the dust collecting plate 3 by the Coulomb force of the.
高電界部で温度測定するには、熱電対35が高電界の影響
を受けずにガスは直接熱電対35に触れることが不可欠で
ある。そこで、本発明ではSUS316-Lのパイプに内面を絶
縁体でコーティングし、パイプの先端にSUS316-Lの網37
を設けてパイプを接地している。パイプをケーシング８
に溶接することで高電界により、導電体であるパイプ外
面および網37に捕捉されたイオンは直ちに接地され
る。In order to measure the temperature in the high electric field portion, it is indispensable that the gas directly contacts the thermocouple 35 without being affected by the high electric field. Therefore, in the present invention, the inner surface of the SUS316-L pipe is coated with an insulator, and the tip of the pipe is made of SUS316-L mesh 37
Is installed to ground the pipe. Casing pipe 8
Due to the high electric field, the ions trapped on the outer surface of the pipe, which is a conductor, and the net 37 are immediately grounded by welding to.
これにより、内部空間にはガスは入るがイオンは入る
ことができない静電遮蔽の状態ができ、ガス温度の測定
が可能となる。本発明により、集塵質５内で最低温度と
なっている集塵板槌打部４の温度測定が可能となるの
で、この部分の温度を酸露点以上のほぼ一定温度に維持
すれば、集塵室５の腐食を防止できる。As a result, an electrostatic shielding state can be created in which gas can enter the internal space but ions cannot enter, and the gas temperature can be measured. According to the present invention, since it is possible to measure the temperature of the hammering part 4 of the dust collecting plate, which has the lowest temperature in the dust collecting material 5, if the temperature of this part is maintained at a substantially constant temperature above the acid dew point, Corrosion of the dust chamber 5 can be prevented.
（ヘ）効果 本発明によれば、電気集塵装置内の集塵室で構造上ガス
温度の最低部かつ高電界（約300Kv/m）部である集塵板
槌打部に対し、高電界の影響を受けないように静電遮蔽
された温度センサを設置し、その温度を酸露点以上のほ
ぼ一定温度に管理できるようにコンピュータにより将来
の温度パターンを予測し、ガス発生設備の運転条件にフ
ィードバックすることにより、集塵室の腐食を防止でき
る。(F) Effect According to the present invention, in the dust collecting chamber in the electrostatic precipitator, the high electric field is applied to the hammering part of the dust collecting plate, which is the lowest electric field (about 300 Kv / m) and the lowest electric field in structure. A temperature sensor with electrostatic shielding is installed so that it will not be affected by, and the future temperature pattern will be predicted by a computer so that the temperature can be controlled at an almost constant temperature above the acid dew point. Feedback can prevent corrosion of the dust collection chamber.
本発明は、高電界部で温度測定をする場合にすべて適用
可能である。INDUSTRIAL APPLICABILITY The present invention is applicable to all cases where temperature is measured in a high electric field section.
第１図は本発明の方法を適用した従来の電気集塵装置の
概略構成図。第２図は従来の温度計設置付近の部分説明
図。第３図は本発明の温度計の縦断面図。第４図は本発
明の温度計の変更例の縦断面図。 21:電気集塵装置、29,29a:温度計 35:熱電対、36:絶縁体 37:網、38:導電体FIG. 1 is a schematic configuration diagram of a conventional electrostatic precipitator to which the method of the present invention is applied. FIG. 2 is a partial explanatory view around the conventional thermometer installation. FIG. 3 is a vertical sectional view of the thermometer of the present invention. FIG. 4 is a vertical sectional view of a modification of the thermometer of the present invention. 21: Electrostatic precipitator, 29, 29a: Thermometer 35: Thermocouple, 36: Insulator 37: Net, 38: Conductor
Claims (1)
口が設けられ、内部に複数のフィールドに分割された集
塵室を有する水平電気集塵装置において、前記集塵室の
各フィールド毎に高電圧、高ダスト濃度に耐える温度計
であって、一端を開放した導電性の管の内面に絶縁体を
付着し、その内部に熱電対を挿入し、該管の開放端に導
電性の網をかぶせ、該管を接地した構造の温度計を設置
すること、該温度計によって集塵板直近部のガス温度を
測定すること、該測定ガス温度パターンから将来の温度
パターンを予測すること、該予測温度パターンにもとづ
いて含塵ガス発生設備の運転条件を制御し、前記集塵装
置内の集塵板の下部槌打部付近のガス温度が酸露点より
も高いほぼ一定温度となるようにすることからなる電気
集塵装置の温度管理方法。1. A horizontal electrostatic precipitator having a gas inlet provided on one side and a gas outlet provided on the other side and having a dust collection chamber divided into a plurality of fields therein, in each field of the dust collection chamber. It is a thermometer that can withstand high voltage and high dust concentration.An insulator is attached to the inner surface of a conductive tube with one end open, and a thermocouple is inserted into the inside of the tube. Covering the net, installing a thermometer having a structure in which the pipe is grounded, measuring the gas temperature in the immediate vicinity of the dust collecting plate by the thermometer, predicting a future temperature pattern from the measured gas temperature pattern, The operating conditions of the dust-containing gas generating equipment are controlled based on the predicted temperature pattern so that the gas temperature near the lower hammering part of the dust collecting plate in the dust collecting device becomes substantially constant temperature higher than the acid dew point. Electrostatic precipitator temperature tube consisting of Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270099A JPH0698321B2 (en) | 1990-10-08 | 1990-10-08 | Electric dust collector temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270099A JPH0698321B2 (en) | 1990-10-08 | 1990-10-08 | Electric dust collector temperature control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04145964A JPH04145964A (en) | 1992-05-19 |
| JPH0698321B2 true JPH0698321B2 (en) | 1994-12-07 |
Family
ID=17481522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2270099A Expired - Fee Related JPH0698321B2 (en) | 1990-10-08 | 1990-10-08 | Electric dust collector temperature control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0698321B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2172271B1 (en) * | 2008-10-01 | 2018-08-29 | General Electric Technology GmbH | A method and a device for controlling the power supplied to an electrostatic precipitator |
| CN102175340B (en) * | 2011-03-15 | 2012-09-19 | 上海市固体废物处置中心 | Dew-point temperature measuring instrument for smoke acid medium of solid waste incinerator |
| CN105170331A (en) * | 2015-08-31 | 2015-12-23 | 浙江菲达环保科技股份有限公司 | Method for determining inlet flue gas temperature of low-low temperature electrostatic precipitator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56100654A (en) * | 1980-01-17 | 1981-08-12 | Nippon Steel Corp | Treatment of sintering exhaust gas |
| JPH0256259A (en) * | 1988-08-19 | 1990-02-26 | Sumitomo Metal Ind Ltd | Improvement of temperature distribution in electrostatic precipitator |
-
1990
- 1990-10-08 JP JP2270099A patent/JPH0698321B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04145964A (en) | 1992-05-19 |
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